CN112304260A - Method for determining length of sintering flue gas cover - Google Patents
Method for determining length of sintering flue gas cover Download PDFInfo
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- 238000005245 sintering Methods 0.000 title claims abstract description 215
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 109
- 239000003546 flue gas Substances 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 69
- 230000008569 process Effects 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 claims description 42
- 238000004364 calculation method Methods 0.000 claims description 9
- 230000001133 acceleration Effects 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000005381 potential energy Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000003566 sealing material Substances 0.000 description 3
- 239000000741 silica gel Substances 0.000 description 3
- 229910002027 silica gel Inorganic materials 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 206010053615 Thermal burn Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B13/00—Measuring arrangements characterised by the use of fluids
- G01B13/02—Measuring arrangements characterised by the use of fluids for measuring length, width or thickness
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
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Abstract
The invention discloses a method for determining the length of a sintering flue gas cover, which comprises the following steps: controlling a sintering machine trolley to drive a sintering charge level to move and drive a specific position of the sintering charge level and a measuring device arranged at the specific position to move together, wherein the relative position of the measuring device and the specific position is kept unchanged; in the movement process of the measuring device, measuring the wind speeds of the specific position to M positions through the measuring device to obtain M corresponding material surface wind speeds, wherein M is a positive integer greater than or equal to 2; obtaining the actual air receiving quantity of the sintering charge level based on the M charge level air speeds; and determining the length of the flue gas hood based on the actual air receiving quantity and the preset air receiving quantity. The invention solves the problem that the air receiving quantity of a sintering charge level does not reach the standard or exceed the standard due to unreasonable setting of the parameters of a flue gas cover in most flue gas circulating systems in the prior art.
Description
Technical Field
The invention relates to the technical field of iron ore sintering, in particular to a method for determining the length of a sintering flue gas cover.
Background
With the development of sintering energy-saving and emission-reducing technology, new energy-saving and emission-reducing processes such as sintering flue gas circulation and the like gradually attract the attention of governments and environmental protection departments and iron and steel enterprises, and are applied to a plurality of sintering machines in China. The design of the sintering flue gas circulation system relates to a plurality of key process parameters, wherein the size structure and the arrangement position of the flue gas hood are determined as the most key parameters. The length of the flue gas hood directly influences the air receiving quantity of the sintering charge level, and the air receiving quantity of the sintering charge level directly influences various indexes such as the quality, the yield and the solid fuel consumption of the sintering ore, so that the reasonable setting of the length of the flue gas hood has important significance for a new energy-saving and emission-reducing process.
However, most of the currently operated flue gas circulating systems have the condition that the air receiving quantity of a sintering charge level does not reach the standard or exceed the standard due to unreasonable flue gas cover parameter setting.
Disclosure of Invention
The embodiment of the application provides a method for determining the length of a sintering flue gas hood, and solves the problem that in the prior art, most flue gas circulating systems have unreasonable flue gas hood parameter setting, so that the air receiving quantity of a sintering charge level does not reach the standard or exceeds the standard.
The application provides the following technical scheme through an embodiment of the application:
a method of determining a length of a sintering flue gas hood, the method comprising: step A: controlling a sintering machine trolley to drive a sintering charge level to move and drive a specific position of the sintering charge level and a measuring device arranged at the specific position to move together, wherein the relative position of the measuring device and the specific position is kept unchanged; and B: in the movement process of the measuring device, measuring the wind speed when the specific position moves to M positions through the measuring device to obtain M material surface wind speeds, wherein the M material surface wind speeds correspond to the M positions one by one, and M is a positive integer greater than or equal to 2; and C: obtaining the actual air receiving quantity of the sintering charge level based on the M charge level air speeds; step D: and determining the length of the flue gas hood based on the actual air receiving quantity and the preset air receiving quantity.
In one embodiment, the measurement device comprises: a middle through pipe, an anemometer and a micro-manometer; the caliber of the first end of the middle through pipe is larger than that of the second end of the middle through pipe, and the anemoscope is arranged at the second end; the measuring the wind speed when the specific position is operated to M positions through the measuring device to obtain M material surface wind speeds, and the measuring method comprises the following steps: measuring a measured wind speed at the second end when the specific position is moved to a first position by the anemometer, wherein the first position is any one of the M positions; measuring, by the micro-manometer, a pressure difference between the second end and the first end when the specific location is moved to the first location; and obtaining the material surface wind speed corresponding to the first position based on the measured wind speed and the pressure difference.
In one embodiment, the ratio of the caliber of the first end to the caliber of the second end is greater than or equal to 2.
In one embodiment, the obtaining a level wind speed corresponding to the first position based on the measured wind speed and the pressure difference comprises: obtaining the level wind speed corresponding to the first position based on the following equation:
vx is the surface wind speed when the specific position runs to the first position; vWind velocity indicator-measured wind speed measured by an anemometer; Δ P — differential pressure measured by the micro-manometer; ρ -air density; g-gravitational acceleration; h-height from first end to second end.
In one embodiment, the specific position is driven by the sintering pallet to run from a measurement starting point to a measurement end point, and the M positions are located between the measurement starting point and the measurement end point; the distance between the measuring starting point and the sintering starting point is 1 m-3 m, and the measuring end point is a sintering end point.
In one embodiment, the measuring device is spaced from the edge of the sinter machine trolley by a distance greater than or equal to 0.3 m.
In one embodiment, before the obtaining of the actual wind exposure of the sintering level based on the M level wind speeds, the method includes: repeating the step A to the step B, and executing N times to obtain N groups of M material surface wind speeds, wherein N is a positive integer, and N is 2-3 times when the width W of the sintering trolley is less than 3 meters; when the width W of the sintering pallet is more than 3m, N is 3-5 times; in N times of measurement, the measuring devices are distributed at N different positions of the sintering charge surface in the width direction, and the N positions are uniformly distributed along the width direction; the obtaining of the actual air receiving quantity of the sintering charge level based on the M charge level air speeds comprises: and obtaining the actual air receiving quantity of the sintering charge level based on the N groups of M charge level air speeds.
In one embodiment, the obtaining the actual air volume received by the sintering charge level based on the N groups of M charge level wind speeds includes: obtaining the actual air receiving quantity of the sintering charge level based on the following equation:
wherein Q is the actual air receiving quantity; n-number of measurements; w is the width of the sintering trolley; l is1-starting point of air volume calculation; l is2-end of air volume calculation; l is1And L2Is of value range L0≤L1＜L2≤L3，L0-measuring the position of the starting point; l is3-measuring the location of the end point; vx-the surface wind speed measured when the measuring device is operated to the first position x.
In one embodiment, the L1And L2The distance of (a) is a distance L; the determining the length of the flue gas hood based on the actual air receiving quantity and the preset air receiving quantity comprises the following steps: when the actual air volume is smaller than the preset air volume, increasing L2And/or reducing L1Determining the current distance L as the length of the flue gas hood until the actual air receiving quantity is equal to the preset air receiving quantity; when the actual air receiving quantity is equal to the preset air receiving quantity, determining the current value of the distance L; when the actual air volume is larger than the preset air volume, increasing L1And/or reducing L2Determining the current air receiving quantity until the actual air receiving quantity is equal to the preset air receiving quantityThe distance L is the length of the flue gas hood.
In one embodiment, the preset air receiving amount is determined based on a sintering flue gas circulation process air taking amount, wherein a proportional coefficient of the sintering flue gas circulation process air taking amount and the preset air receiving amount is alpha, and alpha is more than or equal to 0.85 and less than or equal to 0.95.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
in the embodiment of the application, a measuring device arranged at a specific position of a sintering charge level moves along with the sintering charge level to obtain M charge level wind speeds of the measuring device running to M positions in the running process; thereby based on M charge level wind speed, the actual volume of receiving of obtaining the sintering charge level, because the volume of receiving of sintering charge level directly receives the influence of the length of flue gas cover, consequently, this application is through measuring the actual volume of receiving the wind, and compare with predetermineeing the volume of receiving the wind, can learn whether the current length of flue gas cover is suitable, thereby confirm reasonable flue gas cover's length in view of the above, it is unreasonable to have flue gas cover parameter setting mostly to have solved among the prior art flue gas circulation system, lead to the problem that the volume of receiving of sintering charge level appears not up to standard or exceeds standard.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a sintering machine and a circulating flue gas system provided in an embodiment of the present application;
fig. 2 is a flow chart of a method for determining the length of a sintering flue gas cover provided in an embodiment of the present application.
Detailed Description
The embodiment of the application provides a method for determining the length of a sintering flue gas hood, and solves the problem that in the prior art, most flue gas circulating systems have unreasonable flue gas hood parameter setting, so that the air receiving quantity of a sintering charge level does not reach the standard or exceeds the standard.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
a method of determining a length of a sintering flue gas hood, the method comprising:
step A: controlling a sintering machine trolley to drive a sintering charge level to move and drive a specific position of the sintering charge level and a measuring device arranged at the specific position to move together, wherein the relative position of the measuring device and the specific position is kept unchanged; and B: in the movement process of the specific position of the measuring device, measuring the wind speed when the specific position moves to M positions through the measuring device to obtain corresponding M material surface wind speeds, wherein the M material surface wind speeds are in one-to-one correspondence with the M positions, and M is a positive integer greater than or equal to 2; and C: obtaining the actual air receiving quantity of the sintering charge level based on the M charge level air speeds; step D: and determining the length of the flue gas hood based on the actual air receiving quantity and the preset air receiving quantity.
In the embodiment of the application, a measuring device arranged at a specific position of a sintering charge level moves along with the sintering charge level to obtain M charge level wind speeds of the measuring device running to M positions in the running process; thereby based on M charge level wind speed, the actual volume of receiving of obtaining the sintering charge level, because the volume of receiving of sintering charge level directly receives the influence of the length of flue gas cover, consequently, this application is through measuring the actual volume of receiving the wind, and compare with predetermineeing the volume of receiving the wind, can learn whether the current length of flue gas cover is suitable, thereby confirm reasonable flue gas cover's length in view of the above, it is unreasonable to have flue gas cover parameter setting mostly to have solved among the prior art flue gas circulation system, lead to the problem that the volume of receiving of sintering charge level appears not up to standard or exceeds standard.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Firstly, to facilitate understanding of the technical solution of the present application, the main structures of the sintering machine and the circulating flue gas system and the sintering process are briefly introduced here.
As shown in fig. 1, the proportioning bins are used for storing sintering raw materials, the raw materials are proportioned according to a set proportioning ratio and then are conveyed to the mixing bins by the main proportioning belt to be mixed, the proportioned mixture in the mixing bins is distributed on the table top of a sintering machine trolley through a distributor to form a sintering charge level, the sintering charge level is heated and ignited by high-temperature flue gas combusted at an igniter, and the high-temperature flue gas is combusted downwards along with the advancing of the sintering machine trolley under the action of negative pressure air suction of a fan, the physicochemical change is completed to the tail of the machine, and hot sintering ore falls into a follow-up screening system after being crushed by a single roller.
The lower part of the sintering machine bench machine is provided with a fan, a flue gas hood is covered above the sintering machine bench machine, a flue gas circulating pipeline is arranged between the fan and the flue gas hood, sintering flue gas is generated through a sintering charge level after combustion, the sintering flue gas is recovered under the action of negative pressure air suction of the fan, and is conveyed to the flue gas hood through the flue gas circulating pipeline, the sintering charge level is conveyed out by the flue gas hood, and the part of recovered sintering flue gas is sucked into a sintering material layer under the action of negative pressure air suction to perform auxiliary combustion.
Example one
As shown in fig. 2, the present embodiment provides a method for determining the length of a sintering flue gas cover, the method comprising:
step A: controlling a sintering machine trolley to drive a sintering charge level to move and drive a specific position of the sintering charge level and a measuring device arranged at the specific position to move together, wherein the relative position of the measuring device and the specific position is kept unchanged.
In practical application, the measuring device is fixed at a specific position, and in the process that the sintering machine trolley drives the sintering charge level to move, the specific position moves to a certain position, and the measuring device also moves to the position.
The sintering charge level is continuously combusted in the moving process, and the sintering is finished after the same position (including a specific position) of the sintering charge level sequentially passes through three combustion processes of a sintering front section, a sintering middle section and a sintering tail section. It should be noted that, from the front sintering section to the tail sintering section, the air permeability of the material layer can change greatly, and the front sintering section of the sintering charge level has poor air permeability due to the existence of an over-wet layer, and the charge level air speed of the sintering charge level is small; the porous finished product sinter of the sintering tail section has increased proportion, the air permeability of the sinter bed is improved, and the material surface air speed of the sinter surface is high.
And B: in the movement process of the measuring device, measuring the wind speeds of the specific position to M positions through the measuring device to obtain corresponding M material surface wind speeds, wherein the M material surface wind speeds correspond to the M positions one by one, and M is a positive integer greater than or equal to 2;
in this embodiment, the measuring device disposed at the specific position and moving together with the specific position can measure the real-time wind speed at the specific position in real time, that is, the specific position of the sintering charge level is the measuring point selected in this embodiment. In this embodiment, the measuring device measures M level wind speeds corresponding to M positions of the measuring point (specific position) during the continuous travel and combustion, that is, in this embodiment, the M level wind speeds distributed between the M positions of the sintering front section and the sintering tail section can be measured by following the wind speed change of the same measuring point.
When the measuring device is between a measuring starting point and a measuring end point, the specific position where the measuring device is located is kept unchanged, and continuous measurement is carried out to obtain M material surface wind speeds corresponding to the M positions, wherein the continuous measurement refers to that an anemometer and a micro-pressure meter in the measuring device carry out measurement according to a set frequency of 5-30 seconds;
and C: and obtaining the actual air receiving quantity of the sintering charge level based on the M charge level air speeds.
In this embodiment, the actual air receiving capacity of the sintering charge level is obtained by measuring the air speeds of M charge levels distributed at M positions between the sintering front section and the sintering tail section, so that the actual air receiving capacity of the sintering charge level can be more accurately obtained, and the problem of excessive error caused by measuring only the same position is avoided.
Step D: and determining the length of the flue gas hood based on the actual air receiving quantity and the preset air receiving quantity.
In the actual implementation process, the actual air receiving quantity and the preset air receiving quantity can be compared, and the length of the flue gas hood is determined according to the comparison result, specifically:
when the actual air receiving quantity is equal to the preset air receiving quantity, the current length of the smoke cover is right;
when the actual air receiving quantity is larger than the preset air receiving quantity, the current length of the flue gas cover is not proper, and the length of the flue gas cover needs to be reduced on the basis of the current length so as to reduce the air receiving quantity fed to the sintering charge level until the actual air receiving quantity is equal to the preset air receiving quantity;
when the actual air volume is smaller than the preset air volume, the current length of the flue gas cover is not appropriate, and the length of the flue gas cover needs to be increased on the basis of the current length so as to increase the air volume fed to the sintering charge level until the actual air volume is equal to the preset air volume.
As an alternative embodiment, the measuring device comprises: a middle through pipe, an anemometer and a micro-manometer;
the aperture of the first end of the middle through pipe is larger than that of the second end of the middle through pipe, the anemoscope is arranged at the second end, and in practical application, the range of the anemoscope is 0-50 m/s, and the range of the micro-pressure meter is 0-500 Pa;
the measuring the wind speed when the specific position is operated to M positions through the measuring device to obtain M material surface wind speeds, and the measuring method comprises the following steps:
measuring a measured wind speed at the second end when the specific position is moved to a first position by the anemometer, wherein the first position is any one of the M positions;
measuring, by the micro-manometer, a pressure difference between the second end and the first end when the specific location is moved to the first location;
and obtaining the material surface wind speed corresponding to the first position based on the measured wind speed and the pressure difference.
In the specific implementation process, the first end of the middle through pipe is communicated with the second end, the first end of the middle through pipe is in direct contact with the sintering charge level, and in order to prevent air from passing through a gap between the first end and the sintering charge level and further influence the test result, the first end of the middle through pipe is sealed by an anti-scald soft material (such as a silica gel material).
The current common measuring method for the air quantity of the charge level is to directly place an anemoscope on the sintering charge level, measure the air speed passing through the sintering charge level and calculate the air quantity of the whole sintering charge level according to the measured value of the air speed. The smoke gas amount of the sintering machine per ton ore is generally 2000m3The sintered ore per t is 1.2-1.5 t/(m) according to the utilization coefficient of a sintering machine2H), the average wind speed of the sintering machine charge level is within the range of 0.6m/s to 0.8m/s, the numerical value is small, and the sensitivity of an anemometer is difficult to ensure the accuracy of wind speed measurement.
For this reason, in this embodiment, the middle through pipe having the large-caliber end and the small-caliber end is provided, the speed of the airflow entering from the small-caliber end is amplified, and the measured wind speed is more accurate when the anemometer is used to measure the wind speed of the airflow through the amplification.
Since not only the velocity but also the pressure of the incoming air flow from the second end of the through duct is affected. Based on the Bernoulli principle: conservation of mechanical energy of the fluid, namely: the kinetic energy, the gravitational potential energy and the pressure potential energy are constant, and it can be known that the mechanical energy of the air flow at the second end of the middle through pipe and the mechanical energy of the air flow at the first end are conserved, that is, the kinetic energy, the gravitational potential energy and the pressure potential energy are constant
Namely, it is
Wherein, P1、P2Pressure at the second end and pressure at the first end (sintering level), respectively; ρ -gas density; g-gravitational acceleration; h is1、h2The vertical height of the second end of the middle through pipe from the reference surface and the vertical height of the first end (sintering charge level) of the middle through pipe from the reference surface are respectively, and if the sintering charge level is taken as the reference surface, h2Is 0; v. of1、v2The velocity of the second end of the middle tube and the first end of the middle tube, respectivelyVelocity of the end (sintering level). Therefore, in the embodiment, the pressure difference between the second end of the micro-meter and the first end is utilized, and the anemometer is utilized to measure the wind speed measured at the second end, so that the level wind speed corresponding to the first position can be obtained more accurately.
As an alternative embodiment, the ratio of the caliber of the first end to the caliber of the second end is greater than or equal to 2.
According to the law of conservation of mechanical energy of fluid, when equal-height flows, the flow velocity is large, the pressure is small, namely, along with the amplification of the second end on the velocity, the pressure is reduced, therefore, in order to ensure the measurement accuracy of the micro-manometer, preferably, D is more than or equal to 2 and less than 3, the ratio of the calibers of the first end and the second end of the middle through pipe is not easy to be overlarge, otherwise, the pressure in the pipe can be influenced, and the accuracy is poor.
As an alternative embodiment, the obtaining the level wind speed corresponding to the first position based on the measured wind speed and the pressure difference includes:
obtaining the level wind speed corresponding to the first position based on the following equation:
vx is the surface wind speed when the specific position runs to the first position; vWind velocity indicator-measured wind speed measured by an anemometer; Δ P — differential pressure measured by the micro-manometer; ρ -air density; g-gravitational acceleration; h-height from first end to second end.
As can be seen from the foregoing description of the embodiments,
wherein v is2Namely Vx (P) in the present embodiment1-P2) I.e. Δ P, (h) in the present embodiment1-h2) I.e. H, v in this example1I.e. V in the present embodimentWind velocity indicator。
As an alternative embodiment, the specific position is moved from a measurement starting point to a measurement end point under the driving of the sintering pallet, and the M positions are located between the measurement starting point and the measurement end point;
the distance between the measuring starting point and the sintering starting point is 1 m-3 m, and the measuring end point is a sintering end point.
In the specific implementation process, the distance between the measurement starting point and the sintering starting point can be 1m, 1.5m \2m, 2.4m and 3 m. The M positions are uniformly distributed between the measurement starting point and the measurement end point, the sintering starting point is the position where the igniter is located, and the sintering end point is the tail position of the sintering machine trolley.
As an alternative embodiment, the distance between the measuring device and the edge of the sintering pallet is greater than or equal to 0.3 m.
Because a gap is formed between the edge of the sintering pallet and the sintering charge level, the wind speed is abnormal, so that the distance between the measuring device and the edge of the sintering pallet is limited to be greater than or equal to 0.3m in the embodiment, so as to ensure that the charge level speed of the sintering charge level is measured more truly and accurately.
As an alternative embodiment, before the obtaining of the actual wind exposure of the sintering level based on the M level wind speeds, the method includes:
repeating the steps A-B, and executing N times to obtain N groups of M material surface wind speeds, wherein N is a positive integer,
when the width W of the sintering pallet is less than 3m, N is 2-3 times;
when the width W of the sintering pallet is more than 3m, N is 3-5 times;
in N times of measurement, the measuring devices are distributed at N different positions of the sintering charge surface in the width direction, and the N positions are uniformly distributed along the width direction;
the obtaining of the actual air receiving quantity of the sintering charge level based on the M charge level air speeds comprises:
and obtaining the actual air receiving quantity of the sintering charge level based on the N groups of M charge level air speeds.
Because the wind speeds of different distribution positions are changed in the width direction of the sintering charge level, in this embodiment, in order to further accurately obtain the actual wind receiving amount of the sintering charge level, the wind speeds of M positions are measured for many times, and in N times of measurement, the positions measured each time are different, and in N times of measurement, the N positions are uniformly distributed along the width direction, so that the speeds of the airflows of the positions of the sintering charge level in the width direction at different combustion stages can be more accurately reduced, and the actual wind receiving amount of the sintering charge level is more accurate.
As an optional embodiment, the obtaining the actual air volume received by the sintering burden surface based on the N groups of M burden surface wind speeds includes:
obtaining the actual air receiving quantity of the sintering charge level based on the following equation:
wherein Q is the actual air receiving quantity; n-number of measurements; w is the width of the sintering trolley; l is1-starting point of air volume calculation; l is2-end of air volume calculation; l is1And L2Is of value range L0≤L1＜L2≤L3，L0-measuring the position of the starting point; l is3-measuring the location of the end point; vx-the surface wind speed measured when the measuring device is operated to the first position x.
This embodiment is general, carry out the integral to M charge level wind speed that each measurement obtained to specific position is in different positions, and Vx takes the charge level wind speed that this position surveyed and carries out the integral, can obtain the air volume that receives of whole sintering charge level at a certain moment more, simultaneously, and the average value is got to the sum after N group M charge level wind speed integrals, further more accurately obtains the air volume that receives of whole sintering charge level at a certain moment.
As an alternative embodiment, the L1And L2The distance of (a) is a distance L;
the determining the length of the flue gas hood based on the actual air receiving quantity and the preset air receiving quantity comprises the following steps:
when the actual receiving isThe air quantity is less than the preset air receiving quantity, and L is increased2And/or reducing L1Determining the current distance L as the length of the flue gas hood until the actual air receiving quantity is equal to the preset air receiving quantity;
when the actual air receiving quantity is equal to the preset air receiving quantity, determining the current value of the distance L;
when the actual air volume is larger than the preset air volume, increasing L1And/or reducing L2And determining the current distance L as the length of the flue gas cover until the actual air receiving quantity is equal to the preset air receiving quantity.
It should be noted that the actual air receiving amount, L, is initially determined1Can be taken as L0，L2Can be taken as L3And the actual air receiving quantity of the sintering charge level under the cover setting of the flue gas cover with the current length is obtained by integration at the moment, the actual air receiving quantity and the preset air receiving quantity are judged, and if the actual air receiving quantity and the preset air receiving quantity are larger than the preset air receiving quantity, L is increased1And/or reducing L2For example: l is0<L1＜L2<L3Until the actual air volume is equal to the preset air volume, the length of the flue gas cover is set reasonably, and it needs to be explained that L is increased1And/or reducing L2In the process of (3), Vx also needs to be integrated by taking a corresponding value following the change of x. For the case that the actual air receiving volume is smaller than the preset air receiving volume, the details are not repeated here.
It should be further noted that when the actual air receiving volume is equal to the preset air receiving volume, L can be used as the reference1And L2Determines the position of the fume hood.
As an optional embodiment, the preset air receiving amount is determined based on a sintering flue gas circulation process air intake amount, wherein a proportional coefficient between the sintering flue gas circulation process air intake amount and the preset air receiving amount is α, and α is greater than or equal to 0.85 and less than or equal to 0.95.
The gas taking amount of the sintering flue gas circulation process is the set amount of the sintering flue gas needing to be recycled through the fan, and the value is controllable. The recovered amount is communicated to a flue gas hood through a flue gas circulating pipeline and is sent out from the flue gas hood to give a sintering charge level. Under expected conditions, the air intake of the sintering flue gas circulation process and the air intake of the sintering charge level are consistent, but the air intake of the sintering flue gas circulation process and the air intake of the sintering charge level are often inconsistent due to factors such as air leakage in the actual implementation process.
In this embodiment, in order to ensure that the set sintering flue gas circulation process gas extraction amount can be recovered, by setting α <1, it is ensured that the preset air receiving amount is greater than the sintering flue gas circulation process gas extraction amount, and therefore, the actual air receiving amount greater than the sintering flue gas circulation process gas extraction amount can be provided to the sintering charge level based on the length of the flue gas hood determined by the preset air receiving amount and the actual air receiving amount.
Meanwhile, the value of alpha cannot be too high, if the value is too high, the actual air volume of the sintering charge level is too low, the air volume of the set sintering flue gas circulation process cannot be ensured to be recovered, and if the value is too low, the actual air volume of the sintering charge level is too high, the sintering charge level cannot be received and consumed, leakage is caused, and secondary pollution is caused.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
in the embodiment of the application, a measuring device arranged at a specific position of a sintering charge level moves along with the sintering charge level to acquire M charge level wind speeds of the specific position which runs to M positions in the running process; thereby based on M charge level wind speed, the actual volume of receiving of obtaining the sintering charge level, because the volume of receiving of sintering charge level directly receives the influence of the length of flue gas cover, consequently, this application is through measuring the actual volume of receiving the wind, and compare with predetermineeing the volume of receiving the wind, can learn whether the current length of flue gas cover is suitable, thereby confirm reasonable flue gas cover's length in view of the above, it is unreasonable to have flue gas cover parameter setting mostly to have solved among the prior art flue gas circulation system, lead to the problem that the volume of receiving of sintering charge level appears not up to standard or exceeds standard.
Example two
The specification of the sintering machine measured in this example was 99m2The measuring device is fixed on the sintering charge level at the position 2 meters away from the outlet of the igniter and is marked as a measuring starting point L0(ii) a The lower end of the measuring device is sealed by silica gelSealing with a sealing material; the measuring device runs along with the trolley, the anemometer and the micro-pressure meter continuously measure, read and store, and the frequency of automatic reading and recording is 10 seconds; the measurement end point is selected at the sintering end point and is marked as L3(ii) a The measurement operation was repeated 3 times; in each measurement process, the placing positions of the measuring devices are uniformly distributed in the width direction of the trolley, and the distance between the measuring devices and the baffle plates at the edge of the trolley is 0.5 m; calculating the air receiving quantity of the sintering charge level to be 28.8 ten thousand meters by utilizing a calculation formula of the air receiving quantity of the sintering charge level according to the wind speed measurement result3H, the proportionality coefficient alpha is 0.85, and the gas taking amount of the sintering flue gas circulation process is 15 ten thousand meters3H, the preset air receiving quantity is 17.6 ten thousand meters3H is from L0The length of the flue gas hood for sintering flue gas circulation is 16.3 m.
EXAMPLE III
The measured specification of the sintering machine in this example was 150m2Fixing the measuring device at the 2.5 m position of the outlet of the sintering igniter on the sintering charge level and recording as a measuring starting point L0(ii) a The lower end of the measuring device is sealed by using a silica gel sealing material; the measuring device runs along with the trolley, and the anemometer and the micro-pressure meter continuously measure and store the readings; the frequency of automatic reading and recording is 20 seconds; the measurement end point is selected at the sintering end point and is marked as L3(ii) a Repeating the wind speed measurement operation for 4 times; in each measurement process, the placing positions of the measuring devices are uniformly distributed in the width direction of the trolley, and the distance between the measuring devices and the baffle plates at the edge of the trolley is 0.4 m; calculating the air receiving quantity of the sintering charge level to be 32.4 ten thousand meters by utilizing a calculation formula of the air receiving quantity of the sintering charge level according to the wind speed measurement result3h, the proportionality coefficient alpha is 0.95, and the gas taking quantity of the sintering flue gas circulation process is 27 ten thousand meters3H, the preset air receiving quantity is 28.4 ten thousand meters3H is from L0The length of the flue gas cover for sintering flue gas circulation is 26.3 m.
Example four
The measured specification of the sintering machine in the embodiment is 265m2Fixing the measuring device at the 2.5 m position of the outlet of the sintering igniter on the sintering charge level and recording as a measuring starting point L0(ii) a The lower end of the measuring device is sealed by using a silica gel sealing material; the measuring device runs along with the trolley, and the anemometer and the micro-pressure meter continuously measure and readStoring; the frequency of automatic reading and recording is 30 seconds; the measurement end point is selected at the sintering end point and is marked as L3(ii) a Repeating the wind speed measurement operation for 4 times; in each measurement process, the placing positions of the measuring devices are uniformly distributed in the width direction of the trolley, and the distance between the measuring devices and the baffle plates at the edge of the trolley is 0.4 m; calculating the air receiving quantity of the sintering charge level to be 67.4 km according to the wind speed measurement result by utilizing a sintering charge level air receiving quantity calculation formula3h, the proportionality coefficient alpha is 0.9, and the gas taking amount of the sintering flue gas circulation process is 45 ten thousand meters3H, the preset air receiving quantity is 50 ten thousand meters3H is from L0The length of the flue gas cover for sintering flue gas circulation is 39.7 m.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method of determining a length of a sintering flue gas hood, the method comprising:
step A: controlling a sintering machine trolley to drive a sintering charge level to move and drive a specific position of the sintering charge level and a measuring device arranged at the specific position to move together, wherein the relative position of the measuring device and the specific position is kept unchanged;
and B: in the movement process of the measuring device, measuring the wind speed when the specific position moves to M positions through the measuring device to obtain M material surface wind speeds, wherein the M material surface wind speeds correspond to the M positions one by one, and M is a positive integer greater than or equal to 2;
and C: obtaining the actual air receiving quantity of the sintering charge level based on the M charge level air speeds;
step D: and determining the length of the flue gas hood based on the actual air receiving quantity and the preset air receiving quantity.
2. A method of determining the length of a sintering flue gas hood according to claim 1, wherein the measuring means comprises: a middle through pipe, an anemometer and a micro-manometer;
the caliber of the first end of the middle through pipe is larger than that of the second end of the middle through pipe, and the anemoscope is arranged at the second end;
the measuring the wind speed when the specific position is operated to M positions through the measuring device to obtain M material surface wind speeds, and the measuring method comprises the following steps:
measuring a measured wind speed at the second end when the specific position is moved to a first position by the anemometer, wherein the first position is any one of the M positions;
measuring, by the micro-manometer, a pressure difference between the second end and the first end when the specific location is moved to the first location;
and obtaining the material surface wind speed corresponding to the first position based on the measured wind speed and the pressure difference.
3. The method of determining a length of a sintering flue gas hood of claim 2, wherein a ratio of a caliber of the first end to a caliber of the second end is greater than or equal to 2.
4. The method for determining the length of a sintering flue gas hood according to claim 2, wherein the obtaining the charge level wind speed corresponding to the first position based on the measured wind speed and the pressure difference comprises:
obtaining the level wind speed corresponding to the first position based on the following equation:
vx is the surface wind speed when the specific position runs to the first position; vWind velocity indicator-measured wind speed measured by an anemometer; Δ P — differential pressure measured by the micro-manometer; ρ -air density; g-gravitational acceleration; h-height from first end to second end.
5. The method for determining the length of a sintering flue gas cover according to claim 1, wherein the specific position is driven by the sintering trolley to run from a measurement starting point to a measurement end point, and the M positions are located between the measurement starting point and the measurement end point;
the distance between the measuring starting point and the sintering starting point is 1 m-3 m, and the measuring end point is a sintering end point.
6. A method of determining the length of a sintering flue gas hood as claimed in claim 1, wherein the distance between the measuring device and the edge of the sinter machine trolley is greater than or equal to 0.3 m.
7. The method for determining the length of a sintering flue gas cover according to claim 6, wherein before the obtaining of the actual wind exposure of the sintering level based on the M level wind speeds, the method comprises:
repeating the steps A-B, and executing N times to obtain N groups of M material surface wind speeds, wherein N is a positive integer,
when the width W of the sintering pallet is less than 3m, N is 2-3 times;
when the width W of the sintering pallet is more than 3m, N is 3-5 times;
in N times of measurement, the measuring devices are distributed at N different positions of the sintering charge surface in the width direction, and the N positions are uniformly distributed along the width direction;
the obtaining of the actual air receiving quantity of the sintering charge level based on the M charge level air speeds comprises:
and obtaining the actual air receiving quantity of the sintering charge level based on the N groups of M charge level air speeds.
8. The method for determining the length of a sintering flue gas cover according to claim 7, wherein the obtaining the actual air-receiving capacity of the sintering level based on the N groups of M level wind speeds comprises:
obtaining the actual air receiving quantity of the sintering charge level based on the following equation:
wherein Q is the actual air receiving quantity; n-number of measurements; w is the width of the sintering trolley; l is1-starting point of air volume calculation; l is2-end of air volume calculation; l is1And L2Is of value range L0≤L1＜L2≤L3，L0-measuring the position of the starting point; l is3-measuring the location of the end point; vx-the surface wind speed measured when the measuring device is operated to the first position x.
9. The method of determining a length of a sintering flue gas hood of claim 8, wherein L is1And L2The distance of (a) is a distance L;
the determining the length of the flue gas hood based on the actual air receiving quantity and the preset air receiving quantity comprises the following steps:
when the actual air volume is smaller than the preset air volume, increasing L2And/or reducing L1Determining the current distance L as the length of the flue gas hood until the actual air receiving quantity is equal to the preset air receiving quantity;
when the actual air receiving quantity is equal to the preset air receiving quantity, determining the current value of the distance L;
when the actual air volume is larger than the preset air volume, increasing L1And/or reducing L2And determining the current distance L as the length of the flue gas cover until the actual air receiving quantity is equal to the preset air receiving quantity.
10. The method for determining the length of the sintering flue gas hood according to claim 1, wherein the preset air receiving volume is determined based on a sintering flue gas circulation process air taking volume, wherein a proportionality coefficient of the sintering flue gas circulation process air taking volume and the preset air receiving volume is alpha, and alpha is greater than or equal to 0.85 and less than or equal to 0.95.
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