CN111412485B - Low-nitrogen combustion equipment and wind material supply device thereof - Google Patents
Low-nitrogen combustion equipment and wind material supply device thereof Download PDFInfo
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- CN111412485B CN111412485B CN202010348914.2A CN202010348914A CN111412485B CN 111412485 B CN111412485 B CN 111412485B CN 202010348914 A CN202010348914 A CN 202010348914A CN 111412485 B CN111412485 B CN 111412485B
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- fuel
- precombustion
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 65
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 38
- 239000000463 material Substances 0.000 title claims abstract description 31
- 239000000446 fuel Substances 0.000 claims abstract description 79
- 239000007789 gas Substances 0.000 claims abstract description 67
- 239000007788 liquid Substances 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 33
- 239000002737 fuel gas Substances 0.000 abstract description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 12
- 239000003546 flue gas Substances 0.000 abstract description 12
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 238000009434 installation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000009970 fire resistant effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/002—Gaseous fuel
- F23K5/007—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/38—Nozzles; Cleaning devices therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/44—Preheating devices; Vaporising devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
- F23K5/14—Details thereof
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses low-nitrogen combustion equipment and a wind material supply device thereof, wherein the wind material supply device comprises a fuel gas inlet pipe and a fuel inlet pipe, and the fuel inlet pipe is partially inserted into the fuel gas inlet pipe; the outlet pipe section of the fuel inlet pipe is connected with a precombustion pipe, the pipe wall of the precombustion pipe is provided with air holes, the outlet pipe section of the combustion-supporting gas inlet pipe is a gradually-expanded pipe section gradually expanding along the air flow direction, the precombustion pipe is positioned in the combustion-supporting gas inlet pipe, and the outlet end of the precombustion pipe is arranged in a clearance with the outlet end of the combustion-supporting gas inlet pipe; and the device also comprises an igniter, wherein the igniter can ignite the fuel and the combustion-supporting gas in the precombustion tube. The wind material supply device provided by the invention can effectively reduce the generation of nitrogen oxides so as to meet the emission standard of flue gas.
Description
Technical Field
The invention relates to the technical field of combustion equipment, in particular to low-nitrogen combustion equipment and a wind material supply device thereof.
Background
Referring to fig. 1, fig. 1 is a schematic structural view of an embodiment of a wind material supply device of a conventional combustion apparatus.
As shown in fig. 1, in the air-fuel supply device of the conventional combustion apparatus, a fuel inlet pipe 02 is inserted into a combustion-supporting gas inlet pipe 01, and is fixed in a fire-resistant lining flame path 03 of a furnace through a combustion-supporting gas inlet pipe 01, fuel enters the fuel inlet pipe 02 from a fuel gas inlet 021, is sprayed out from a fuel nozzle 022, and is directly sprayed into the furnace for combustion after being mixed with combustion-supporting gas entering from a self-supporting gas inlet 011 in a mixing nozzle 012, so that the fuel can be fully combusted, and high-temperature, excessive oxygen supply, concentrated combustion and other modes are generally adopted, accordingly, the flame center temperature in a combustion area of the furnace body is higher, so that the content of NO X in flue gas is higher, and the emission requirement is difficult to meet.
Therefore, how to provide a solution to reduce the NOX content in the flue gas as much as possible is still a technical problem to be solved by the person skilled in the art.
Disclosure of Invention
The invention aims to provide low-nitrogen combustion equipment and a wind material supply device thereof, wherein the wind material supply device can reduce the NO X content in flue gas.
In order to solve the technical problems, the invention provides a wind material supply device of low-nitrogen combustion equipment, which comprises a fuel gas inlet pipe and a fuel inlet pipe, wherein the fuel inlet pipe is partially inserted into the fuel gas inlet pipe; the outlet pipe section of the fuel inlet pipe is connected with a precombustion pipe, the pipe wall of the precombustion pipe is provided with air holes, the outlet pipe section of the combustion-supporting gas inlet pipe is a gradually-expanded pipe section gradually expanding along the air flow direction, the precombustion pipe is positioned in the combustion-supporting gas inlet pipe, and the outlet end of the precombustion pipe is arranged in a clearance with the outlet end of the combustion-supporting gas inlet pipe; and the device also comprises an igniter, wherein the igniter can ignite the fuel and the combustion-supporting gas in the precombustion tube.
By adopting the structure, the outlet pipe section of the fuel inlet pipe is connected with the precombustion pipe, and the peripheral wall of the precombustion pipe is provided with the air holes, so that combustion-supporting gas in the combustion-supporting gas inlet pipe can enter the precombustion pipe through the air holes to perform precombustion, at the moment, the fuel in the precombustion pipe is in an anoxic combustion state, and oxygen in the combustion-supporting gas can preferentially perform combustion reaction with the fuel and does not react with nitrogen to generate NOX, thereby achieving the aim of reducing nitrogen combustion; the gradually-expanding pipe section is designed in a gradually-expanding way, after the high-temperature mixed gas in the pre-combustion pipe is discharged from the outlet end of the gradually-expanding pipe section, the high-temperature mixed gas can be mixed with the high-speed combustion-supporting gas in the combustion-supporting gas inlet pipe and flow to the outer edge of the gradually-expanding pipe section in an out-diffusion way, so that a certain degree of negative pressure is generated in the central area of the gradually-expanding pipe section, high-temperature flue gas in the low-nitrogen combustion equipment furnace body can be forced to flow back, the oxygen concentration in the gradually-expanding pipe section can be further reduced, and the temperature of a flame high-temperature area is reduced, so that the generation of thermal nitrogen oxides is reduced.
Therefore, the wind material supply device provided by the invention can effectively reduce the generation of nitrogen oxides so as to meet the emission standard of flue gas.
Optionally, the precombustion pipe includes installation pipeline section, reducing pipeline section, choke section and expansion pipeline section, the installation pipeline section be used for with the fuel advances the pipe and links to each other, the major diameter end of reducing pipeline section with the installation pipeline section links to each other, the minor diameter end of reducing pipeline section with the one end of choke section links to each other, the other end of choke section with the expansion pipeline section links to each other, the pipe wall of reducing pipeline section is equipped with the gas pocket.
Optionally, the expansion pipe section comprises an equal-diameter section, the radial dimension of the equal-diameter section is larger than that of the throat pipe section, a step surface is formed between the equal-diameter section and the throat pipe section, and the step surface and/or the pipe wall of the equal-diameter section is provided with the air hole.
Optionally, the air holes are distributed at a plurality of positions in the axial direction of the equal-diameter section, and a first baffle is arranged between the air holes at two adjacent positions in the axial direction.
Optionally, the expansion pipe section further comprises a divergent section, the small diameter end of the divergent section is connected with the equal diameter section, and the divergent section is also provided with the air hole.
Optionally, a second baffle is arranged on the outer wall of the diverging section, and the second baffle is positioned at the downstream of the air holes of the diverging section; and/or the diverging section is at least partially located within the diverging section.
Optionally, the mounting pipe section is connected with the fuel inlet pipe in a sleeving length adjustable mode.
Optionally, at least part of the air holes are distributed at intervals along the axial direction of the precombustion tube, and the flow rate of the air holes at the downstream position in the axial direction is larger than that of the air holes at the upstream position adjacently.
Optionally, the inner wall of the diverging pipe section is provided with swirl guiding structures distributed at intervals along the circumferential direction.
Optionally, when the fuel provided by the fuel inlet pipe is liquid fuel, a fuel nozzle is arranged at the outlet of the fuel inlet pipe.
Optionally, the ignition position of the igniter is located in the precombustor or the ignition position of the igniter is located between the outlet end of the precombustor and the outlet end of the combustion air inlet tube; and/or, a monitor for monitoring the ignition condition.
The invention also provides low-nitrogen combustion equipment, which comprises a furnace body and a wind material supply device, wherein the wind material supply device is the wind material supply device of the low-nitrogen combustion equipment.
Since the wind material supply device of the low-nitrogen combustion apparatus has the technical effects as described above, the low-nitrogen combustion apparatus with the wind material supply device also has similar technical effects, and thus the description thereof is omitted herein.
Drawings
FIG. 1 is a schematic view of a construction of one embodiment of a wind feed apparatus of a conventional combustion device;
FIG. 2 is a schematic structural view of an embodiment of a wind feed device of a low nitrogen combustion apparatus according to the present invention;
FIG. 3 is a schematic view of the structure of a precombustor;
FIG. 4 is a schematic view of the configuration of a diverging section;
fig. 5 is a schematic structural view of another embodiment of a wind material supply device of a low-nitrogen combustion apparatus according to the present invention.
The reference numerals in fig. 1 are explained as follows:
01 combustion-supporting gas inlet pipe, 011 combustion-supporting gas inlet, 012 mixing nozzle;
02 fuel inlet pipe, 021 fuel inlet, 022 fuel spray head;
03 fire-resistant lining fire channel of furnace.
The reference numerals in fig. 2-5 are illustrated as follows:
1a fuel gas inlet pipe, 11 a divergent pipe section, 111 a swirl groove and 12 a combustion gas inlet;
2 fuel inlet pipe, 21 fuel spray head, 22 fuel inlet;
3a precombustion pipe, 31 a mounting pipe section, 32 a reducing pipe section, 33a throat pipe section, 34 an expanding pipe section, 341a constant diameter section, 341a step surface, 341b first baffle, 342a gradually expanding section, 342a second baffle, 3a air holes, 3a-1 first-stage air holes, 3a-2 second-stage air holes, 3a-3 third-stage air holes, 3a-4 fourth-stage air holes and 3a-5 fifth-stage air holes;
4, an igniter;
And 5, monitoring the fire.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
The term "plurality" as used herein refers to a plurality, typically two or more, of indefinite quantities; and when "a number" is used to denote the number of a certain number of components, the number of components is not necessarily related to each other.
The terms "first," "second," and the like herein, are merely used for convenience in describing two or more structures or components that are identical or functionally similar, and do not necessarily represent a particular limitation on the order and/or importance.
Referring to fig. 2-5, fig. 2 is a schematic structural view of an embodiment of a wind material supply device of a low-nitrogen combustion apparatus according to the present invention, fig. 3 is a schematic structural view of a precombustion tube, fig. 4 is a schematic structural view of a diverging tube section, and fig. 5 is a schematic structural view of another embodiment of a wind material supply device of a low-nitrogen combustion apparatus according to the present invention.
As shown in fig. 2, the invention provides a wind material supply device of low-nitrogen combustion equipment, which comprises a fuel gas inlet pipe 1 and a fuel inlet pipe 2, wherein the fuel inlet pipe 2 is partially inserted into the fuel gas inlet pipe 1; the outlet pipe section of the fuel inlet pipe 2 is connected with a precombustion pipe 3, the pipe wall of the precombustion pipe 3 is provided with air holes 3a, the outlet pipe section of the combustion-supporting gas inlet pipe 1 is a gradually-expanding pipe section 11 gradually expanding along the air flow direction, the precombustion pipe 3 is positioned in the combustion-supporting gas inlet pipe 1, and the outlet end of the precombustion pipe 3 is arranged in a clearance with the outlet end of the combustion-supporting gas inlet pipe 1; and an igniter 4, wherein the igniter 4 can ignite fuel and fuel aid gas in the precombustor 3.
The auxiliary fuel gas inlet pipe 1 is also provided with an auxiliary fuel gas inlet 12, the fuel inlet pipe 2 is also provided with a fuel inlet 22, and when in use, the auxiliary fuel gas can be introduced into the auxiliary fuel gas inlet pipe 1 through the auxiliary fuel gas inlet 12, and the fuel can be introduced into the fuel inlet pipe 2 through the fuel inlet 22. The fuel here mainly refers to gas fuel (natural gas, coal gas, etc.) or liquid fuel (fuel oil, flammable waste liquid, etc.) with certain fluidity, when liquid fuel is adopted, as shown in fig. 5, the outlet of the fuel inlet pipe 2 may also be provided with a fuel spray head 21 for scattering the liquid fuel in the fuel inlet pipe 2 into droplets so as to facilitate the mixing and ignition of the subsequent fuel and combustion-supporting gas; specifically, the fuel injector 21 may be an atomizer, and at least compressed air is introduced into the atomizer to form atomized droplets, which is more beneficial to uniformly mixing fuel and fuel gas.
In the embodiment of the invention, the outlet pipe section of the fuel inlet pipe 2 is connected with the precombustion pipe 3, the peripheral wall of the precombustion pipe 3 is provided with the air hole 3a, so that the combustion-supporting gas in the combustion-supporting gas inlet pipe 1 can enter the precombustion pipe 3 through the air hole 3a to perform precombustion, at the moment, the fuel in the precombustion pipe 3 is in an anoxic combustion state, and oxygen in the combustion-supporting gas can preferentially perform combustion reaction with the fuel and not react with nitrogen to generate NOX, thereby achieving the aim of reducing nitrogen combustion; the diverging pipe section 11 is of diverging design, after the high-temperature mixed gas in the precombustion pipe 3 is discharged from the outlet end of the diverging pipe section, the high-temperature mixed gas can be mixed with the high-speed combustion-supporting gas in the combustion-supporting gas inlet pipe 1 and flow to the outer edge of the diverging pipe section 11 in an out-diffusing mode, so that a certain negative pressure appears in the central area of the diverging pipe section 11, high-temperature flue gas in the low-nitrogen combustion equipment furnace body can be forced to flow back, the oxygen concentration in the diverging pipe section 11 can be reduced, and the temperature of a flame high-temperature area is reduced, so that the generation of thermal nitrogen oxides is reduced.
Therefore, the wind material supply device provided by the invention can effectively reduce the generation of nitrogen oxides so as to meet the emission standard of flue gas.
The nitrogen oxides in the flue gas mainly comprise a thermal type and a material type, wherein the thermal type mainly refers to nitrogen oxides formed by combustion of nitrogen in air at high temperature, and the material type refers to nitrogen oxides formed by combustion of nitrogen-containing compounds in the material; in general, nitrogen oxides in flue gas are mainly of thermal type, and the higher the flame temperature, the higher the oxygen concentration and the longer the flue gas stays in a high temperature zone during combustion, the more the thermal type nitrogen oxides.
In a specific scheme, as shown in fig. 2 and 3, the precombustion tube 3 may include a mounting tube section 31, a reducing tube section 32, a throat tube section 33 and an expansion tube section 34, the mounting tube section 31 may be used for connecting with the fuel inlet tube 2, a large diameter end of the reducing tube section 32 may be connected with the mounting tube section 31, a small diameter end of the reducing tube section 32 may be connected with one end of the throat tube section 33, the other end of the throat tube section 33 may be connected with the expansion tube section 34, and a tube wall of the reducing tube section 32 is provided with an air hole 3a.
By adopting the structure, the diameter-reduced pipe section 32 and the throat pipe section 33 can be combined to form a venturi structure, so that the flow rate of fuel can be increased, at the moment, the flow rate of the fuel in the diameter-reduced pipe section 32 is increased, negative pressure can be formed on the opposite outside of the inside of the diameter-reduced pipe section, combustion-supporting gas in the combustion-supporting gas inlet pipe 1 can be sucked into the diameter-reduced pipe section 32 so as to be mixed with the fuel in the diameter-reduced pipe section 32, and meanwhile, the structural design can also effectively prevent flame from burning in the reverse airflow direction.
The air holes 3a provided in the diameter-reduced pipe section 32 may be distributed at the same position in the axial direction or may be distributed at different positions in the axial direction, and the number of the air holes 3a at the same position in the axial direction may be one or a plurality of the air holes, and when a plurality of the air holes are provided, the air holes 3a may be distributed at intervals in the circumferential direction. In the embodiment of fig. 3, the air holes 3a of the reduced diameter tube section 32 are distributed at the same position in the axial direction, and this portion of the air holes 3a may be referred to as first stage air holes 3a-1 for convenience of description.
The radial dimension of the expansion pipe section 34 may be greater than the radial dimension of the throat section 33, taking the scheme in fig. 3 as an example, the expansion pipe section 34 may include an equal-diameter section 341, the radial dimension of the equal-diameter section 341 may be greater than the throat section 33, a step surface 341a may be formed between the equal-diameter section 34 and the throat section 33, and the step surface 341a may be provided with an air hole 3a. For convenience of description, the air holes 3a provided in the step surface 341a may be referred to as second-stage air holes 3a-2, and the number of the second-stage air holes 3a-2 may be one or plural, and when plural, the second-stage air holes 3a-2 may be distributed at intervals in the circumferential direction of the step surface 341a, and the combustion-supporting air in the combustion-supporting air inlet pipe 1 may enter the constant diameter section 341 through the above-described second-stage air holes 3 a-2.
The pipe wall of the equal-diameter section 341 may also be provided with air holes 3a, and the air holes 3a provided in the equal-diameter section 341 may be distributed in a plurality of axial positions, and the air holes 3a in each axial position may be one or a plurality of circumferentially spaced air holes 3a, and a first baffle 341b may be provided between the air holes 3a in two axially adjacent positions, and the first baffle 341b may be a circumferentially closed annular plate or a circumferentially non-closed plate, such as an arc plate, which is specifically related to the number of the air holes 3a distributed in each axial position.
In the embodiment of fig. 3, the air holes 3a may be distributed at two positions in the axial direction of the equal-diameter section 341, and the aforementioned first baffle 341b may be disposed between the two positions, and for convenience of description, the air holes 3a relatively located at the axially upstream side may be referred to as third-stage air holes 3a-3, the air holes 3a relatively located at the axially downstream side may be referred to as fourth-stage air holes 3a-4, and the first baffle 341b therebetween may function to intercept the air flow to increase the resistance of the air flow, so that more combustion-supporting air may be allowed to enter the equal-diameter section 341 from the third-stage air holes 3 a-3.
When the air holes 3a are distributed at three or more positions in the axial direction of the constant diameter section 341, two or more first baffles 341b are present in the axial direction of the constant diameter section 341, at this time, the radial dimension of the downstream first baffle 341b may be set to be larger than the radial dimension of the adjacent upstream first baffle 341b, so as to gradually increase the interception height of the adjacent downstream first baffle 341b, and further ensure that each first baffle 341b may intercept a portion of the fuel gas for the air holes 3a located upstream and adjacent thereto.
The expansion pipe section 34 may further include a diverging section 342, the small diameter end of the diverging section 342 may be connected to the constant diameter section 341, the diverging section 342 may also be provided with an air hole 3a, and the combustion-supporting air in the combustion-supporting air inlet pipe 1 may enter the diverging section 342 through the air hole 3a provided in the diverging section 342. The air holes provided in the diverging section 342 may be distributed at the same position in the axial direction or may be distributed at different positions in the axial direction, and the number of the air holes 3a at the same position in the axial direction may be one or may be plural, and when plural, the air holes 3a at the same position in the axial direction may be distributed at intervals in the circumferential direction. In the embodiment of fig. 3, the air holes 3a of the diverging section 342 may be distributed at the same position in the axial direction, and for convenience of description, this portion of the air holes 3a may be referred to as fifth-stage air holes 3a-5.
The outer wall of the diverging section 342 may be provided with a second baffle 342a, and the second baffle 342a is located downstream of the air holes 3a of the diverging section 342, and the second baffle 342a is similar to the first baffle 341b in structure and function, and can function to intercept the air flow, so that more fuel gas can enter the diverging section 342 through the fifth-stage air holes 3 a-5.
In the above-mentioned scheme, the air holes 3a are actually distributed at a plurality of positions along the axial direction of the precombustion tube 3, so that the combustion-supporting gas can be mixed with the fuel in the precombustion tube 3 for a plurality of times to disperse the combustion positions, each combustion is insufficient combustion under the anoxic state, and the oxygen can react with the fuel preferentially to eliminate the combustion of reducing nitrogen as much as possible.
Further, in each of the air holes 3a axially spaced, the flow rate of the air hole 3a at the downstream position is smaller than the flow rate of the air hole 3a at the adjacent upstream position, and taking the embodiment of fig. 3 as an example, the flow rates of the air holes 3a at the respective positions may satisfy the following relationship: the relationship of the first-stage air holes 3a-1< the second-stage air holes 3a-2< the third-stage air holes 3a-3< the fourth-stage air holes 3a-4< the fifth-stage air holes 3a-5 can be realized by changing the number of the air holes 3a or the aperture of the air holes 3a at each position, so that the amount of combustion-supporting gas mixed in the air holes 3a at different positions in the axial direction of the precombustion tube 3 is continuously increased in the air flow direction to form a combustion state of the combustion-supporting gas from none to few to many.
Here, the embodiment of the present invention is not limited to the ratio a of the combustion-supporting gas to the total amount of the combustion-supporting gas, which is entered into the precombustion tube 3 through the air hole 3a, and in practice, a person skilled in the art may set the ratio a according to actual needs, for example, the ratio a may be set to 0.3-0.5, and correspondingly, the ratio B of the combustion-supporting gas to the total amount of the combustion-supporting gas between the outlet end of the precombustion tube 3 and the outlet end of the combustion-supporting gas intake tube 1 may be set to 0.5-0.7.
In practical applications, the above ratio a may be adjusted by changing the number and/or the pore diameter of the air holes 3a, or may be adjusted by adjusting the distance between the outlet end of the precombustion tube 3 and the outlet end of the diverging tube section 11. Taking the latter scheme as an example, the installation pipe section 31 can be connected with the fuel inlet pipe 2 in a sleeving length adjustable mode, for example, threaded connection and the like can be adopted between the installation pipe section 31 and the fuel inlet pipe, when the distance between the outlet end of the precombustion pipe 3 and the outlet end of the diverging pipe section 11 is reduced, the ratio A can be increased to increase the mixing amount of combustion-supporting gas in the precombustion pipe 3, and when the distance between the outlet end of the precombustion pipe 3 and the outlet end of the diverging pipe section 11 is increased, the ratio A of the combustion-supporting gas can be reduced, the mixing amount of the combustion-supporting gas in the precombustion pipe 3 can be reduced, thereby being beneficial to improving the hearth temperature of a furnace body; or the mounting pipe section 31 and the fuel inlet pipe 2 can be connected in a welding mode, at the moment, the length of the sleeved part of the mounting pipe section and the fuel inlet pipe can be adjusted according to the requirement, and then the mounting pipe section and the fuel inlet pipe 2 are welded and fixed.
Further, at least part of the diverging section 342 may be located in the diverging section 11, so that a guiding channel may be formed between the diverging section 342 and the diverging section 11 to guide the high-speed combustion-supporting gas in the combustion-supporting gas inlet pipe 1 to the outer edge of the outer diverging section 11, which is more beneficial to form a negative pressure in the central area of the diverging section 11.
The inner wall of the diverging pipe section 11 can be further provided with swirl guiding structures distributed at intervals along the circumferential direction, and the swirl guiding structures can guide combustion-supporting gas in the combustion-supporting gas inlet pipe 1, so that swirl is formed at the position close to the pipe wall of the diverging pipe section 11 by the combustion-supporting gas, the mixed combustion of high-temperature mixed gas discharged by the outlet end of the precombustion pipe 3 and the combustion-supporting gas is guaranteed at the position close to the pipe wall of the diverging pipe section 11, meanwhile, negative pressure is formed in the central area of the diverging pipe section 11, high-temperature low-oxygen flue gas in a hearth is promoted to flow back to the central area of the diverging pipe section 11, the oxygen content and flame temperature of the flame central area of the diverging pipe section 11 can be reduced, and the production amount of thermal nitrogen oxides is reduced. Referring to fig. 4, the swirl guiding structure may be a plurality of swirl grooves 111 provided on the inner wall of the diverging pipe section 11, and each swirl groove 111 may be a linear type or an arc type, and may be specifically determined according to practical situations; or the swirl guiding structure can also be a plurality of swirl ribs arranged on the inner pipe wall of the diverging pipe section 11, and the swirl ribs can also be linear or arc.
It should be noted that the above-mentioned expanded pipe section 34 including the constant diameter section 341 and the diverging section 342 is only an exemplary description of the embodiment of the present invention, and is not intended to limit the implementation range of the wind material supplying device provided by the present invention, and other structures of the expanded pipe section 34 may be adopted under the condition that the function is satisfied, for example, the diverging section 342 may be directly adopted to form the expanded pipe section 34, where the small diameter end of the diverging section 342 may be connected with the throat section 33; in addition, since combustion is performed in the precombustion tube 3, the precombustion tube 3 may be made of heat-resistant metal to enhance heat resistance of the precombustion tube 3.
The ignition position of the igniter 4 can be located in the precombustor 3, and the structure can be seen in fig. 2 and 5, and at this time, the igniter 4 can directly ignite fuel and combustion-supporting gas in the precombustor 3; or the ignition position of the igniter 4 may be located between the outlet end of the precombustion tube 3 and the outlet end of the combustion-supporting gas inlet tube 1, at this time, the igniter 4 will ignite the fuel and the combustion-supporting gas between the outlet end of the precombustion tube 3 and the outlet end of the combustion-supporting gas inlet tube 1, and then indirectly ignite the fuel and the combustion-supporting gas in the precombustion tube 3.
In order to monitor the ignition condition, the air supply device provided by the invention can further comprise a monitor 5, the structure forms of the monitor 5 can be various, two types of monitors 5 are respectively shown in fig. 2 and 5, and in the specific implementation, a person skilled in the art can select the type of the monitor according to actual needs as long as the use can be satisfied.
The invention also provides low-nitrogen combustion equipment, which comprises a furnace body (not shown in the figure) and a wind material supply device, wherein the wind material supply device is the wind material supply device of the low-nitrogen combustion equipment in each embodiment.
Since the wind material supply device of the low-nitrogen combustion apparatus has the technical effects as described above, the low-nitrogen combustion apparatus with the wind material supply device also has similar technical effects, and thus the description thereof is omitted herein.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The utility model provides a low nitrogen combustion equipment's wind material feeding device, includes helping gas advance pipe (1) and fuel advance pipe (2), fuel advance pipe (2) part cartridge in helping gas advance pipe (1), its characterized in that, the export pipeline section of fuel advance pipe (2) is connected with precombustion pipe (3), the pipe wall of precombustion pipe (3) is equipped with gas pocket (3 a), the export pipeline section of helping gas advance pipe (1) is the divergent pipe section (11) that expands along the air current direction, precombustion pipe (3) are located helping gas advances pipe (1), just the exit end of precombustion pipe (3) with the exit end clearance setting of helping gas advances pipe (1);
the device also comprises an igniter (4), wherein the igniter (4) can ignite fuel and combustion-supporting gas in the precombustion tube (3);
The pre-combustion pipe (3) comprises an expansion pipe section (34), the expansion pipe section (34) is positioned at the tail end of the pre-combustion pipe (3), the expansion pipe section (34) further comprises a divergent section (342), an outlet end of the divergent section (342) forms an outlet end of the pre-combustion pipe (3), and the divergent section (342) is at least partially positioned in the divergent section (11);
The pre-combustion pipe (3) further comprises a mounting pipe section (31), a reducing pipe section (32) and a throat pipe section (33), wherein the mounting pipe section (31) is used for being connected with the fuel inlet pipe (2), the large-diameter end of the reducing pipe section (32) is connected with the mounting pipe section (31), the small-diameter end of the reducing pipe section (32) is connected with one end of the throat pipe section (33), the other end of the throat pipe section (33) is connected with the expansion pipe section (34), and the pipe wall of the reducing pipe section (32) is provided with the air hole (3 a);
The mounting pipe section (31) is connected with the fuel inlet pipe (2) in a sleeving length adjustable mode; the inner wall of the diverging pipe section (11) is provided with rotational flow guiding structures distributed at intervals along the circumferential direction.
2. Wind feed device of a low nitrogen combustion apparatus according to claim 1, characterized in that the expansion pipe section (34) comprises a constant diameter section (341), the radial dimension of the constant diameter section (341) is larger than that of the throat section (33), a step surface (341 a) is formed between the constant diameter section (341) and the throat section (33), and the step surface (341 a) and/or the pipe wall of the constant diameter section (341) is provided with the air hole (3 a).
3. A wind feed device of a low nitrogen combustion apparatus according to claim 2, characterized in that said air holes (3 a) are distributed at a plurality of positions in the axial direction of said constant diameter section (341), and that first baffles (341 b) are provided between said air holes (3 a) at axially adjacent two positions.
4. A wind feed device of a low nitrogen combustion apparatus according to claim 2, characterized in that the small diameter end of the diverging section (342) is connected to the constant diameter section (341), the diverging section (342) is also provided with the air holes (3 a).
5. A wind feed arrangement of a low nitrogen combustion device according to claim 4, characterized in that the outer wall of the diverging section (342) is provided with a second baffle (342 a), and that the second baffle (342 a) is located downstream of the air holes (3 a) of the diverging section (342).
6. A wind feed arrangement of a low nitrogen combustion device according to any of the claims 1-5, characterized in that at least part of the air holes (3 a) are distributed at intervals in the axial direction of the pre-combustion tube (3), the flow rate of the air holes (3 a) in axially downstream position being larger than the flow rate of the air holes (3 a) in adjacent upstream position.
7. Wind feed arrangement of a low nitrogen combustion device according to any of the claims 1-5, characterized in that the outlet of the fuel inlet pipe (2) is provided with a fuel nozzle (21) when the fuel provided by the fuel inlet pipe (2) is liquid fuel.
8. A wind feed arrangement of a low nitrogen combustion device according to any of the claims 1-5, characterized in that the ignition position of the igniter (4) is located inside the pre-combustion tube (3) or that the ignition position of the igniter (4) is located between the outlet end of the pre-combustion tube (3) and the outlet end of the combustion air intake tube (1).
9. Wind feed arrangement of a low nitrogen combustion device according to any of the claims 1-5, further comprising a monitor (5) for monitoring the ignition situation.
10. A low nitrogen combustion apparatus comprising a furnace body and a wind feed device, characterized in that the wind feed device is a wind feed device of a low nitrogen combustion apparatus according to any one of claims 1-9.
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