CN105063273A - Converter primary flue gas low-energy-consumption semidry-process dust removal system - Google Patents
Converter primary flue gas low-energy-consumption semidry-process dust removal system Download PDFInfo
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Abstract
The invention relates to a converter primary flue gas low-energy-consumption semidry-process dust removal system which comprises a high-temperature non-metal compensator, an evaporative cooler and a liquid-film-type evaporative cooling tower which are connected with an evaporation cooling flue, and an adjustable-ring-slot washing-dewatering-demisting integrated tower connected with a fan inlet pipe network, wherein the lower end of the evaporative cooler is connected with a smoke inlet end of a banana bent pipe; the inside of a smoke inlet end of the banana bent pipe is connected with the inside of the lower end of the liquid-film-type evaporative cooling tower; the outer wall of the upper end of the liquid-film-type evaporative cooling tower is sheathed with a liquid film generation tank; the upper end of the liquid-film-type evaporative cooling tower is provided with an uptake flue; and an outlet end of the uptake flue is connected with the upper end of a flue gas guide pipe arranged in the adjustable-ring-slot washing-dewatering-demisting integrated tower through a connecting flue. The system provided by the invention can satisfy higher smoke dust discharge standard or requirement for the converter flue gas cleaning recovery system, improve the quality of the recovered coal gas, reduce the cooling/dust-removal water treatment quantity, lower the energy consumption and enhance the operation reliability and safety of the system.
Description
Technical field
The present invention relates to a kind of dust-removal system, particularly relate to a kind of converter flue gas less energy-consumption semidrying dust-removal system, belong to prevention and control of air pollution and flue gas cooling and dedusting technical field.
Background technology
Environmental issue has become an important factor of restriction China Iron And Steel Industry sustained and coordinated development.October 1, 2012 implementation of the "iron and steel industry air pollutant emission standard" (GB28664-2012), for steel enterprises set stricter air pollutant emission control requirements and limits, beginning January 1, 2015, whether new or existing enterprises, their emissions under the concentration must be up to 50 mg/m3, February 27, 2013, the state decided to iron and steel, cement and other industries in different times began to perform special atmospheric pollutants emission limit value;According to the national trend of more and more strict with environment quality, the more cities and enterprises have set the enterprise internal control carbon concentration under 30 mg/Nm3.New environmental law the tightest in China's history came into effect from January 1st, 2015, and following closely, all refinement policies that various places are worked out according to new environmental law will be put into effect successively.
Current environmental protection pollution treatment is in the critical period solving the old and new's problem, and as the converter steelmaking link of one of the important source of pollution of iron and steel enterprise, a converter flue gas particles discharge is the dye thing thing exhausting control source listed in especially in national standard.The treatment process be applicable to, how according to practical situation, is selected by enterprise, realizes the efficiency upgrading of converter gas purification and recovery process technology, has become focus and the focus of iron and steel enterprise's modern converter steel-making energy-saving and emission-reduction.
Converter steelmaking adopts oxygen blast to smelt, and in converting process, its exhaust gas volumn, exhaust gas components and flue-gas temperature are periodical change with the smelting stage.Simultaneously can produce a large amount of flue gas and dust in converting process, particularly can reach more than 80% in the flue gas CO concentration in blowing mid-term, when CO content is about 60% time, its calorific value can reach 8000KJ/Nm3.And containing a large amount of Fe, FeO, Fe2O3 etc. in dust, total amount is generally 10 ~ 20kg/t steel.Visible, the CO content in converter gas is very high, and the iron level in dust is also very high, has very high recovery value.Converter its particle diameter major part when furnace gas does not fire is more than 10 μm, and after furnace gas burning, then major part is less than 1 μm, and trapping difficulty is large relatively.
Converter current (flue gas) gas purification and recovery system gas cleaning mode mainly contain complete wet OG method, the forms such as semidrying (dry wet combination) and dry method LT method, introduce and digest the literary composition gas purification of wet method saturator and recovery system and the New O G technology of transplanting in recent years, mainly improve two civilian aditus laryngis, by R--D, PA class Venturi meter changes the adjustable annular gap scrubber of heavy mound type into, cancellation-Wen simultaneously, replace saturated cooling tower, its technology maturation, processing unit is simple, easy to operate, particularly technology controlling and process aspect, automatic or manual controls all very safe and reliable.But its shortcoming also clearly, the new OG wet method system resistance usually split is damaged still high: in actual use, blower press reaches 22KPa--24KPa usually;
System water amount is large, and supporting water treating equipment are huge; Maintenance of equipment amount is large, and working cost is high.
The semidrying of the evaporative cooler picked in recent years+circular seam type adjustable throat inlet Venturi combination, adopts evaporative cooler tentatively to cool and dedusting flue gas, receives to obtain the thick dry dirt of part, adopts annular gap scrubber to carry out final cooling and smart dedusting to flue gas.From the situation of application, this technique have receive part dry ash, improve de-dusting cycle water water quality, reduce the advantage such as quantity of circulating water.But it is few that existing semi-dry process goes out dry ash ratio, the cinder that its evaporative cooler is collected accounts for about 40% of total dustiness in flue gas, and evaporative cooler outlet dust content is still up to 60-100g/Nm3, circular seam type adjustable throat inlet Venturi entrance flue gas temperature, at 150-280 DEG C, is unsaturated state, under this operating mode, for reaching system dust removing target value, ensureing the aggregation efficiency of two literary compositions, need consume and more can be situated between, also because entrance flue gas temperature is high, foulant crystallization speed is increased.In order to solve two problems that civilian inlet flue gas dust content is high, temperature is high, prior art is at the preposition many group washing unit of two literary compositions or other dust removing units, but its technical process long, take up room large, bend is many, resistance damage large, water consumption is large and limit by mill construction, space;
Usual existing semi-dry process Systematical control requirement is high, failure rate is high; In evaporative cooler, the sticky ash of wet wall, ash discharging hole are easily stifled cold;
Costs and poor dehydration results after usual existing semidrying system wet portion annular gap scrubber, flue gas free water content is high, in flue gas, a large amount of washing drop and wash-down water drop form the free water smoke being the nucleus of condensation with soot dust granule thing, export with flue gas and diffuse, formation systemic resistance is high, but efficiency of dust collection is difficult to the chronic disease of raising.
Summary of the invention
For above-mentioned defect, the object of the present invention is to provide a kind of converter flue gas less energy-consumption semidrying dust-removal system, combined by evaporative cooler and liquid film type wet cooling tower, point two-stage evaporative cooling, dry wet ash discharge is long in conjunction with the flue gas section of doing shallow layer settling horizontal route, improves dry ash recovery rate, adopt liquid film type transpiration cooling tower flue gas cyclone technique, improve transpiration cooling speed and the efficiency of dust collection of less than 300 DEG C flue gas flue gases, solve the technical barrier that cold zone adopts transpiration cooling dust adhering wall serious, make adjustable circumferential weld weight washer entrance import more pre-atomized water smoke, improve comprehensively fine particle in adjustable circumferential weld weight washer cohesion collection efficiency while reach low-resistance, less energy-consumption runs, adopt adjustable circumferential weld washing dehydration demist integrated technique, improve the modularization of coal gas dust removal of converter purification system and integrated level, enhanced system is to the ability of the dehydrating demisting of water mists, the clean discharged gas fume of the degree of depth, effective raising cooling, dedusting, the fractional efficiency of each component units of dewatering system, thus improve total efficiency of dust collection of dust-removal system, the higher dust emission standard of converter gas purification recovery system or requirement can be met, promote the quality of gas recovery, reduce cooling dust-water treatment amount, reduce energy consumption, improve the reliability of system cloud gray model, security.
The technical solution adopted in the present invention is for this reason:
Comprise the evaporative cooler be connected with gasification cooling flue by Non-Metallic Expansion Joints, liquid film type wet cooling tower and the adjustable circumferential weld washing dehydration demist integrated tower be connected with fans entrance pipe network, the lower end of described evaporative cooler is connected with the bending tubes end of banana bend pipe, be connected in liquid film type wet cooling tower lower end in the smoke end of described banana bend pipe, liquid film type wet cooling tower upper end outer wall cover has liquid film generation trough, liquid film type wet cooling tower upper end is provided with funnel uptake, the exit end of funnel uptake is connected with the upper end of the flue gas thrust-augmenting nozzle be built in adjustable circumferential weld washing dehydration demist integrated tower by connecting flue,
Described gasification cooling flue inner wall at end is distributed with some prescriptions to downward two-fluid aerosol spray gun I;
The lower end, crook of described banana bend pipe is provided with belly cinder conveyer, and the output terminal of described belly cinder conveyer is connected with removing ash pipeline, and the end of described removing ash pipeline connects collection ash silo.
Annular space between the smoke end outer wall of described liquid film type transpiration cooling inner wall of tower lower end and banana bend pipe forms intercepting basin, the smoke end overcentre of banana bend pipe is provided with dry wet interface umbrella hood, the lower rim diameter of described dry wet interface umbrella hood is greater than the smoke end diameter of banana bend pipe, the overcentre of described dry wet interface umbrella hood is provided with direction flushing spray gun down, rinses above spray gun and is provided with the two-fluid aerosol spray gun II be directed upwardly;
Be provided with adjustable circumferential weld weight washer in described adjustable circumferential weld washing dehydration demist integrated tower to be connected with flue gas thrust-augmenting nozzle lower end, be provided with the export-oriented dedusting of some layers being positioned at flue gas thrust-augmenting nozzle bottom in the annular space that the inwall of the adjustable shell of circumferential weld weight washer and the outer wall of flue gas thrust-augmenting nozzle and adjustable circumferential weld washing dehydration demist integrated tower surrounds to dewater spiral board, the top of described export-oriented dedusting dehydration spiral board is provided with the some layers export-oriented dehydrating demisting spiral board I be positioned in the middle part of flue gas thrust-augmenting nozzle, in described flue gas thrust-augmenting nozzle, upper end is provided with the downward some stressor layer water fog spraying guns in direction, the two ends up and down of described export-oriented dedusting dehydration spiral board are respectively equipped with often opens water fog spraying gun, described water fog spraying gun of often opening is towards export-oriented dedusting dehydration spiral board,
The side wall lower ends of described liquid film type wet cooling tower is provided with water shoot and is connected with self-stip water lute drainer, the side wall lower ends of described adjustable circumferential weld washing dehydration demist integrated tower is provided with buck comb and is connected with self-stip water lute drainer, and self-stip water lute drainer is connected with overhead chute by blow-off pipe.
Further, the smoke end of described banana bend pipe comprises tapered tube and pipe, and described pipe is arranged on the upper end of tapered tube, and the lower rim diameter of described dry wet interface umbrella hood is greater than pipe diameter.
Further, be provided with water tooth weir in described liquid film generation trough, the sidewall of described liquid film generation trough is provided with water-supply pipe.
Further, the inlet end of described connection flue is connected with the outer wall circumference of funnel uptake is tangent, and the upper end of described funnel uptake is provided with explosion venting valve.
Further, some layers export-oriented dehydrating demisting spiral board II is provided with in described adjustable circumferential weld washing dehydration demist integrated tower, described some layers export-oriented dehydrating demisting spiral board II is positioned at the top of flue gas thrust-augmenting nozzle, is provided with the two-fluid aerosol spray gun III be directed upwardly between described export-oriented dehydrating demisting spiral board II and flue gas thrust-augmenting nozzle.
Further, described adjustable circumferential weld weight washer comprises adjustable annular gap scrubber body, scalable heavy stone roller, hydraulic efficiency servo-gear and guide rod.
Further, the sidewall of described banana bend pipe is provided with wall ash vibrator.
Further, the sidewall of described adjustable circumferential weld washing dehydration demist integrated tower lower end is provided with inspection manhole.
Further, the upper end of described removing ash pipeline is provided with unloading valve.
advantage of the present invention is:
1) the present invention is by adopting Non-Metallic Expansion Joints, under frequent variations condition at high temperature, the horizontal and vertical displacement of gasification cooling flue can be adapted to, have pressure release effect concurrently, without any need for medium and maintenance, the overflow water seal comparing usual OG runs safer, reliable and economical.
2) the present invention is by the evaporative cooler of preposition dry-running, the front end of evaporative cooler adopts two-fluid spray gun, cooled flue gas after making water fogging with high pressure steam or nitrogen, coarse grained dust is reunited sedimentation under the effect of water smoke, the meal dirt of sedimentation is transported to cinder feed bin by cinder delivery system, adopt evaporation cooling high-temperature flue gas, improve high-temperature flue gas water smoke transpiration cooling speed, the heat of identical injection flow rate is 10 times of traditional OG wet method, only this-step water consumption than usual Whote-wet method OG water consumption few 85%, water consumption and the dry method of cooled flue gas are close.
3) the present invention by bottom the evaporative cooler cinder delivery system evaporative cooler of preposition dry-running with banana bend pipe horizontal channel and banana bend pipe upwards outlet pipe form U-shaped coarse particles sedimentation passage, its flue gas section of doing horizontal route is long, shallow layer settling condition is good, simultaneously, conduction due to liquid film generation trough inward eddy makes flue gas produce eddy flow in banana bend pipe upwards outlet pipe, thinner dust Accelerated subsidence under cyclonic action of failing to realize gravity settling, , thus the dust reaching more than 50% is collected with the form of dry ash, this semidry process is compared usual wet cooling tower dry ash recovery rate and is improved 25%, substantially improve de-dusting cycle water water quality, at least can reduce the water treatment system process water yield 50%,
4) the present invention adopts liquid film type wet cooling tower, solve the technical barrier that less than 300 DEG C flue gases adopt transpiration cooling dust adhering wall serious, liquid film generation trough inner water tooth weir liquid film type transpiration cooling inner wall of tower produces uniform wall flowing water film, tangentially export under suction function at flue gas and produce eddy flow in liquid film type wet cooling tower, flue gas eddy flow in liquid film type wet cooling tower, the water mists on the one hand two-fluid spray gun being produced fully mixes with flue gas, accelerate heat transfer process of cooling, improve transpiration cooling speed and the efficiency of less than 300 DEG C flue gases; Separately-aspect, flue gas eddy flow in liquid film type wet cooling tower, add the disturbance of flue gas, make mutually elastic collision to occur between grit, droplet, accelerate the moistening cohesion of grit the wall that becomes to flow down with wall and let out or sedimentation, enter-walk the grade dust-collection efficiency improving liquid film type wet cooling tower, annular gap scrubber inlet flue gas dust content is significantly reduced.
5) the present invention is before adjustable annular gap scrubber entrance, by adopting two-fluid (aqueous vapor) spray gun transpiration cooling flue gas in liquid film type wet cooling tower and adopting flue gas cyclone technique, the water smoke that a large amount of well-mixed water smoke is produced with annular gap scrubber precondition pressure water fog spraying gun under blower negative pressure effect imports in annular gap scrubber in the lump, lower flue-gas temperature can be obtained before adopting transpiration cooling to make annular gap scrubber in-aspect liquid film type wet cooling tower, separately-aspect, can make annular gap scrubber entrance import the spraying of more pre-atomized.Because the pressure of circumferential weld ingress wet gas is less, temperature or the partial pressure of water vapor of the saturated wet gas in annular gap scrubber are very large on the impact of water capacity, temperature is lower, aqueous vapor dividing potential drop is less, water capacity is less, water capacity number directly have influence on total saturated wet gas amount, affect further the resistance of circumferential weld assembly, what pre-atomized was sprayed add can not only improve fine particle in annular gap scrubber cohesion collection efficiency; Also by the transpiration cooling cooling in liquid film type wet cooling tower, reduce the saturated wet gas amount entering annular gap scrubber, reduce the resistance of circumferential weld assembly further, reach high-efficiency low-resistance, low energy consumption high-efficiency.
6) present system resistance is little, and unit equipment is looked younger than usual converter semidrying system, and reduction by 14% is damaged in resistance, the configurable more lower powered blower fan power of system, and combination unit system cloud gray model power consumption reduces by 18%, estimates economize on electricity 1.2 KWhs/ton of steel.
7) present system take up space and plane take up an area little.Invention unit equipment modularization integration degree is high, reduces about 40% relative to existing converter semidrying dust collecting process floor space, and system is simple and clear, and flow process is unobstructed compact, system maintenance and simple, convenient.
8) efficiency of dust collection of the present invention is high.Some layers of dedusting dehydration spiral board and the export-oriented dehydrating demisting spiral board of some layers is provided with in adjustable circumferential weld washing dehydration demist integrated tower, flue gas exports respectively by gravity settling at annular gap scrubber, Ash Water Separator, reflexed upper reaches, further employing spiral board dedusting dehydration, enhance the dehydrating demisting ability of system to water mists, the clean discharged gas fume of the degree of depth, guarantee that exiting flue gas discharge dust content is stablized and reach existing state-set standard or more excellent local inner quality standard, namely discharge dust content≤20mg/Nm3(after gas cleaning and mark condition) or lower discharge dust content, obvious environment benefit.
9) cooling and dewatering efficiency of the present invention is high.Some layers of dedusting dehydration spiral board and the export-oriented dehydrating demisting spiral board of some layers is provided with in adjustable circumferential weld washing dehydration demist integrated tower, flue gas is through adopting spiral board dedusting dehydration further, after degree of depth cleaning, then from bottom to top through multistage dehydrating demisting, its multistage dehydrating demisting, dehydrating demisting runner is long, and is the export-oriented eddy flow dehydration technique of low-drag type, and aqueous vapor is separated thoroughly and less energy-consumption.System outlet flue gas gas temperature compares usual converter, and once new OG method system is low, thus, in flue gas, in moisture content and flue gas, saturated moisture content reduces than usual semidrying system, the water content in coal gas is significantly reduced during gas recovery, improve caloric power of gas, greatly reduce simultaneously and export moisture with wet flue gas, reduce systemic circulation water consumption and water treatment expense, promote the gas quality reclaimed.
10) relative to existing converter semidrying dust collecting process, because outlet drain dust contained flue gas concentration of the present invention is low, significantly can slow down the few blowing out of the equipment generation dust probability Minus such as draught fan impeller and examine clearly the time, improve production operational availability, extend the work-ing life of gas recovery system equipment and blower fan.Because dustiness after gas cleaning is low, humidity is low, abradability is little, greatly reduce system maintenance work amount, improve the reliability of system cloud gray model, security.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure, 1 is Non-Metallic Expansion Joints, 2 is gasification cooling flues, 3 is evaporative coolers, 4 is liquid film type wet cooling towers, 5 is adjustable circumferential weld washing dehydration demist integrated towers, 6 is banana bend pipes, 7 is liquid film generation troughs, 8 is funnel uptakes, 9 is connect flue, 10 is flue gas thrust-augmenting nozzles, 11 is two-fluid aerosol spray gun I, 12 is belly cinder conveyers, 13 is removing ash pipelines, 14 is collection ash silos, 15 is intercepting basins, 16 is dry wet interface umbrella hoods, 17 is rinse spray gun, 18 is two-fluid aerosol spray gun II, 19 is export-oriented dedusting dehydration spiral boards, 20 is export-oriented dehydrating demisting spiral board I, 21 is pressure water fog spraying guns, 22 is often open water fog spraying gun, 23 is water shoots, 24 is self-stip water lute drainers, 25 is buck combs, 26 is blow-off pipes, 27 is overhead chutes, 28 is water-supply pipes, 29 is explosion venting valves, 30 is export-oriented dehydrating demisting spiral board II, 31 is two-fluid aerosol spray gun III, 32 is adjustable annular gap scrubber bodies, 33 is scalable heavy stone rollers, 34 is hydraulic efficiency servo-gears, 35 is guide rods, 36 is wall ash vibrators, 37 is inspection manholes, 38 is unloading valves.
Embodiment
A kind of converter flue gas less energy-consumption semidrying dust-removal system, comprise the evaporative cooler 3 be connected with gasification cooling flue 2 by Non-Metallic Expansion Joints 1, liquid film type wet cooling tower 4 and the adjustable circumferential weld washing dehydration demist integrated tower 5 be connected with fans entrance pipe network, the lower end of described evaporative cooler 3 is connected with the bending tubes end of banana bend pipe 6, be connected in liquid film type wet cooling tower 4 lower end in the smoke end of described banana bend pipe 6, liquid film type wet cooling tower 4 upper end outer wall cover has liquid film generation trough 7, liquid film type wet cooling tower 4 upper end is provided with funnel uptake 8, the exit end of funnel uptake 8 is connected with the upper end of the flue gas thrust-augmenting nozzle 10 be built in adjustable circumferential weld washing dehydration demist integrated tower 5 by connecting flue 9,
Described gasification cooling flue 2 inner wall at end is distributed with some prescriptions to downward two-fluid aerosol spray gun I11;
The lower end, crook of described banana bend pipe 6 is provided with belly cinder conveyer 12, and the output terminal of described belly cinder conveyer 12 is connected with removing ash pipeline 13, and the end of described removing ash pipeline 13 connects collection ash silo 14.
Annular space between the smoke end outer wall of described liquid film type wet cooling tower 4 inwall lower end and banana bend pipe 6 forms intercepting basin 15, the smoke end overcentre of banana bend pipe 6 is provided with dry wet interface umbrella hood 16, the lower rim diameter of described dry wet interface umbrella hood 16 is greater than the smoke end diameter of banana bend pipe 6, the overcentre of described dry wet interface umbrella hood 16 is provided with direction flushing spray gun 17 down, rinses above spray gun 17 and is provided with the two-fluid aerosol spray gun II18 be directed upwardly;
Be provided with adjustable circumferential weld weight washer in described adjustable circumferential weld washing dehydration demist integrated tower 5 to be connected with flue gas thrust-augmenting nozzle 10 lower end, the lower end of described flue gas thrust-augmenting nozzle 10 is provided with some layers export-oriented dedusting dehydration spiral board 19, the top of described export-oriented dedusting dehydration spiral board 19 is provided with the some layers export-oriented dehydrating demisting spiral board I20 be positioned in the middle part of flue gas thrust-augmenting nozzle 10, in described flue gas thrust-augmenting nozzle 10, upper end is provided with the downward some stressor layer water fog spraying guns 21 in direction, the two ends up and down of described export-oriented dedusting dehydration spiral board 19 are respectively equipped with often opens water fog spraying gun 22, described water fog spraying gun 22 of often opening is towards export-oriented dedusting dehydration spiral board 19,
The side wall lower ends of described liquid film type wet cooling tower 4 is provided with water shoot 23 and is connected with self-stip water lute drainer 24, the side wall lower ends of described adjustable circumferential weld washing dehydration demist integrated tower 5 is provided with buck comb 25 and is connected with self-stip water lute drainer 24, and self-stip water lute drainer 24 is connected with overhead chute 27 by blow-off pipe 26.
Further, the smoke end of described banana bend pipe 6 comprises tapered tube and pipe, and described pipe is arranged on the upper end of tapered tube, and the lower rim diameter of described dry wet interface umbrella hood 16 is greater than pipe diameter.
Further, be provided with water quality in described liquid film generation trough 7, the sidewall of described liquid film generation trough 7 is provided with water-supply pipe 28.
Further, the inlet end of described connection flue 9 is connected with the outer wall circumference of funnel uptake 8 is tangent, and the upper end of described funnel uptake 8 is provided with explosion venting valve 29.
Further, some layers export-oriented dehydrating demisting spiral board II30 is provided with in described adjustable circumferential weld washing dehydration demist integrated tower 5, described some layers export-oriented dehydrating demisting spiral board II30 is positioned at the top of flue gas thrust-augmenting nozzle 10, is provided with the two-fluid aerosol spray gun III31 be directed upwardly between described export-oriented dehydrating demisting spiral board II30 and flue gas thrust-augmenting nozzle 10.
Further, described adjustable circumferential weld weight washer comprises adjustable annular gap scrubber body 32, scalable heavy stone roller 33, hydraulic efficiency servo-gear 34 and guide rod 35.
Further, the sidewall of described banana bend pipe 6 is provided with wall ash vibrator 36.
Further, the sidewall of described adjustable circumferential weld washing dehydration demist integrated tower 5 lower end is provided with inspection manhole 37.
Further, the upper end of described removing ash pipeline 13 is provided with unloading valve 38.
embodiment 1
The high-temperature flue gas that converter mouth place produces, after movable gas hood is collected, by gasification cooling flue 2 cooling down, and in the inner wall at end of gasification cooling flue 2, be distributed with some prescriptions to downward two-fluid aerosol spray gun I11, flue-gas temperature is down to about 900 DEG C by 1450 DEG C-1600 DEG C, flue gas enters in evaporative cooler 3 by Non-Metallic Expansion Joints 1, due to the lasting spray of two-fluid aerosol spray gun I11, when flue-gas temperature is arrived bottom banana bend pipe 6, flue-gas temperature is down to 220 DEG C-300 DEG C, Non-Metallic Expansion Joints 1 have compensate due to the cold and hot temperature difference cause flexible, deviation when compensation is installed and the effect of damping, expansion joint skeleton adopts 1Cr18Ni9Ti material, expander adopts high temperature resistant non-metallic fabrics.The medium of double-fluid water fog spray gun I11 is water and nitrogen (steam) water is be ejected in shape below nozzle from the center of nozzle to be about 120 at an angle
othe umbrella fluid barrier of hollow, high pressure steam then sprays from the annular slot of nozzle medium pore surrounding, and shape is 60 at an angle
oumbrella vapour stream, temperature reaches 200
oc.When operating, high pressure steam stream is beaten on cooling-water flowing, makes water become tiny water droplet, and water droplet is evaporated by flue gas heating, absorbs the heat of flue gas thus reduce flue-gas temperature in vaporescence.In the lower end, crook of banana bend pipe 6, belly cinder conveyer 12 is set, the cinder that evaporative cooler 3 is separated is collected in banana bend pipe 6 and is input in collection ash silo 14 by belly cinder conveyer 12 by removing ash pipeline 13, removing ash pipeline 13 is set up unloading valve 38, ash is unloaded in the cinder timing realizing being collected, the sidewall of banana bend pipe 6 is arranged wall ash vibrator 36, effectively avoid cinder to be bonded on the inwall of banana bend pipe.
Flue gas after cooling enters in liquid film type wet cooling tower 4 from the smoke end of banana bend pipe 6, be provided with double-fluid water fog spray gun II18 in liquid film type wet cooling tower 4 to continue to lower the temperature to flue gas, water in the liquid film generation trough of liquid film type wet cooling tower 4 upper end is along the inwall of liquid film type wet cooling tower 4 toward dirty formation liquid film, flue dust is effectively prevented to be bonded on the inwall of liquid film type wet cooling tower 4, the buck flow down along liquid film type wet cooling tower 4 inwall is collected in intercepting basin 15, drain in self-stip water lute drainer 24 by water shoot 23 waterpower, and enter in overhead chute 27 by blow-off pipe 26, liquid film generation trough 7 is provided with that water-supply pipe 28 is sustainable to supply water.
Flue gas after purification is under system fan suction function, enter in the flue gas thrust-augmenting nozzle 10 be built in adjustable circumferential weld washing dehydration demist integrated tower 5 by connecting flue 9, enter in adjustable circumferential weld weight washer along flue gas thrust-augmenting nozzle 10, the ingress of flue gas thrust-augmenting nozzle 10 is provided with pressure water fog spraying gun 21, for adjustable circumferential weld weight washer provides pre-atomized washings, the vapour stream flue gas that in liquid film type wet cooling tower, high-temperature flue gas transpiration cooling is formed imports in flue gas thrust-augmenting nozzle 10 by flue gas thrust-augmenting nozzle 10 and the water smoke of pressure water fog spraying gun 21 high-velocity jet under suction function, flue gas enters in adjustable circumferential weld weight washer and realizes the gas purification smart dedusting of reclaiming and process of cooling of conducting heat under blower negative pressure effect, adjustable circumferential weld weight washer has the two kinds of functions regulating tolerance and purification cooling coal gas, according to converter mouth differential pressure signal, adopt hydraulic efficiency servo-gear 34 heavily to cut or polish jade with an emery wheel 33 by actuating mechanism controls adjustable circumferential weld weight washer lower end liftable again to move up and down, by the size of adjustable circumferential weld weight washer contact area, dust content of gas control is carried out to coal gas, namely coal-gas recovering dust content 40mg/Nm3 is controlled, discharge dust content is lower than 30mg/Nm3.
Be provided with the export-oriented dedusting of some layers being positioned at flue gas thrust-augmenting nozzle 10 bottom in the annular space that the inwall of the adjustable shell of circumferential weld weight washer and the outer wall of flue gas thrust-augmenting nozzle 10 and adjustable circumferential weld washing dehydration demist integrated tower 5 surrounds to dewater spiral board 19, and descend layout often to open water fog spraying gun thereon, misty liquid droplets big area dispersion on export-oriented dedusting dehydration spiral board 19, form liquid film and liquid net, strong stirring is formed with the gas-liquid rotated upwards, remix, cohesion, the physical processes such as high efficiency separation, remove the fine soot dust granule in flue gas, the degree of depth realizing flue gas is clean, for water system for often to open, above export-oriented dedusting dehydration spiral board 19, the some layers export-oriented dehydrating demisting spiral board I20 be positioned in the middle part of flue gas thrust-augmenting nozzle 10 is set, some layers export-oriented dehydrating demisting spiral board II30 is set above flue gas thrust-augmenting nozzle 10, flue gas is through some layers export-oriented dehydrating demisting spiral board I20 and the cleaning of the export-oriented dehydrating demisting spiral board II30 dehydrating demisting degree of depth, complete gas, liquid is separated, isolated liquid stream cohesion forms moisture film and lets out under the narrow annular channel between the external diameter and tower wall of export-oriented dehydrating demisting spiral board I20 and export-oriented dehydrating demisting spiral board II30, self-stip water lute drainer 24 is drained into by buck comb 25 waterpower, the below of export-oriented dehydrating demisting spiral board II30 is provided with the two-fluid aerosol spray gun III be directed upwardly, the exit gas temperature of adjustable circumferential weld washing dehydration demist integrated tower 5 is cooled to 50-55 DEG C.
Flue gas, after converter flue gas less energy-consumption semidrying dust-removal system cooling and dedusting, enters in fans entrance pipe network in blower negative pressure effect, boosts to three-way switch valve by centrifugal blower.When flue gas meets recovering condition, flue gas switches to water seal inverted valve by three-way switch valve, is sent to gas chamber, then by the booster fan of Gas Pressurization Station, gas pressing is sent to each user after water seal inverted valve and gas holder import water seal; When flue gas does not meet recovering condition, flue gas switches to diffusing chimney through by-pass valve, three-way switch valve, then by blowdown stack ignition bleeding.
Embodiment 2
BOF nominal capacity 120t/ stove, maximum molten iron Intake Quantity: 150t/ stove; Maximum tap: 145t; The converter smelting cycle: 35 minutes; The Converter Oxigen Blowing time: 14 ~ 17 minutes; Converter slag-making system: single slag process; Maximum original furnace gas amount: 95000Nm3/h;
evaporative cooler technical parameter:
Input gas temperature: Max1000 DEG C, exit gas temperature: about 240 ~ 320 DEG C, nozzle quantity: 12 ~ 14, bleed type: mixed double-flow spray gun outward, water supply flow: 46m3/h, water supply water temperature :≤35 DEG C, water supply pressure: 0.8Mpa (contact place), steam consumption quantity: 5.5t/h vapor pressure: 1.0Mpa (contact place), nitrogen amount: 1200Nm3/h nitrogen pressure: 0.8Mpa (contact place), flue-gas temperature :≤1000 DEG C of efficiency of dust collections: ~ 52%, the amount of gathering dust: 6.2t/h; Equipment resistance :≤500Pa;
liquid film type wet cooling tower:
Exit gas temperature: about ~ 72 DEG C, overflow water+two-fluid spray gun water supply flow: 60m3/h, water supply water temperature :≤40 DEG C, two-fluid spray gun water supply pressure: 0.8Mpa (contact place), nitrogen amount: 260Nm3/h nitrogen pressure: 0.5Mpa (contact place) exiting flue gas pressure :-1.3kPa;
adjustable circumferential weld washing dehydration demist integrated tower:adjustable circular seam washing+export-oriented dehydrating demisting spiral board water supply flow: 170m3/h, water supply water temperature :≤40 DEG C, water supply pressure: 0.42-0.5Mpa (contact place), exiting flue gas pressure :-16.5kPa;
Above; be only the preferred embodiment of patent of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; pass through the understanding of-Ding professional technique and theory; the change that can expect easily or replacement, all should be encompassed within the scope of guarantor's expansion of the present invention, and the protection domain that therefore guarantor's expansion scope of the present invention defines with claim is as the criterion.
Claims (8)
1. converter flue gas less energy-consumption semidrying dust-removal system, it is characterized in that, comprise the evaporative cooler be connected with gasification cooling flue by Non-Metallic Expansion Joints, liquid film type wet cooling tower and the adjustable circumferential weld washing dehydration demist integrated tower be connected with fans entrance pipe network, the lower end of described evaporative cooler is connected with the bending tubes end of banana bend pipe, be connected in liquid film type wet cooling tower lower end in the smoke end of described banana bend pipe, liquid film type wet cooling tower upper end outer wall cover has liquid film generation trough, liquid film type wet cooling tower upper end is provided with funnel uptake, the exit end of funnel uptake is connected with the upper end of the flue gas thrust-augmenting nozzle be built in adjustable circumferential weld washing dehydration demist integrated tower by connecting flue,
Described gasification cooling flue inner wall at end is distributed with some prescriptions to downward two-fluid aerosol spray gun I;
The lower end, crook of described banana bend pipe is provided with belly cinder conveyer, and the output terminal of described belly cinder conveyer is connected with removing ash pipeline, and the end of described removing ash pipeline connects collection ash silo;
Annular space between the smoke end outer wall of described liquid film type transpiration cooling inner wall of tower lower end and banana bend pipe forms intercepting basin, the smoke end overcentre of banana bend pipe is provided with dry wet interface umbrella hood, the lower rim diameter of described dry wet interface umbrella hood is greater than the smoke end diameter of banana bend pipe, the overcentre of described dry wet interface umbrella hood is provided with direction flushing spray gun down, rinses above spray gun and is provided with the two-fluid aerosol spray gun II be directed upwardly;
Be provided with adjustable circumferential weld weight washer in described adjustable circumferential weld washing dehydration demist integrated tower to be connected with flue gas thrust-augmenting nozzle lower end,
Be provided with the export-oriented dedusting of some layers being positioned at flue gas thrust-augmenting nozzle bottom in the annular space that the inwall of the adjustable shell of circumferential weld weight washer and the outer wall of flue gas thrust-augmenting nozzle and adjustable circumferential weld washing dehydration demist integrated tower surrounds to dewater spiral board, the top of described export-oriented dedusting dehydration spiral board is provided with the some layers export-oriented dehydrating demisting spiral board I be positioned in the middle part of flue gas thrust-augmenting nozzle, in described flue gas thrust-augmenting nozzle, upper end is provided with the downward some stressor layer water fog spraying guns in direction, the two ends up and down of described export-oriented dedusting dehydration spiral board are respectively equipped with often opens water fog spraying gun, described water fog spraying gun of often opening is towards export-oriented dedusting dehydration spiral board,
The side wall lower ends of described liquid film type wet cooling tower is provided with water shoot and is connected with self-stip water lute drainer, the side wall lower ends of described adjustable circumferential weld washing dehydration demist integrated tower is provided with buck comb and is connected with self-stip water lute drainer, and self-stip water lute drainer is connected with overhead chute by blow-off pipe.
2. a kind of converter according to claim 1 flue gas less energy-consumption semidrying dust-removal system, it is characterized in that, the smoke end of described banana bend pipe comprises tapered tube and pipe, and described pipe is arranged on the upper end of tapered tube, and the lower rim diameter of described dry wet interface umbrella hood is greater than pipe diameter.
3. a kind of converter according to claim 1 flue gas less energy-consumption semidrying dust-removal system, it is characterized in that, be provided with water tooth weir in described liquid film generation trough, the sidewall of described liquid film generation trough is provided with water-supply pipe.
4. a kind of converter according to claim 1 flue gas less energy-consumption semidrying dust-removal system, it is characterized in that, the inlet end of described connection flue is connected with the outer wall circumference of funnel uptake is tangent, and the upper end of described funnel uptake is provided with explosion venting valve.
5. a kind of converter according to claim 1 flue gas less energy-consumption semidrying dust-removal system, it is characterized in that, some layers export-oriented dehydrating demisting spiral board II is provided with in described adjustable circumferential weld washing dehydration demist integrated tower, described some layers export-oriented dehydrating demisting spiral board II is positioned at the top of flue gas thrust-augmenting nozzle, is provided with the two-fluid aerosol spray gun III be directed upwardly between described export-oriented dehydrating demisting spiral board II and flue gas thrust-augmenting nozzle.
6. a kind of converter according to claim 1 flue gas less energy-consumption semidrying dust-removal system, is characterized in that, described adjustable circumferential weld weight washer comprises adjustable annular gap scrubber body, scalable heavy stone roller, hydraulic efficiency servo-gear and guide rod.
7. a kind of converter according to claim 1 flue gas less energy-consumption semidrying dust-removal system, is characterized in that, the sidewall of described banana bend pipe is provided with wall ash vibrator.
8. a kind of converter according to claim 1 flue gas less energy-consumption semidrying dust-removal system, is characterized in that, the sidewall of described adjustable circumferential weld washing dehydration demist integrated tower lower end is provided with inspection manhole, and the upper end of described removing ash pipeline is provided with unloading valve.
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| CN105483319A (en) * | 2016-01-28 | 2016-04-13 | 北京中冶设备研究设计总院有限公司 | Converter gas tower Venturi dust removal device and method |
| CN107034335A (en) * | 2017-05-18 | 2017-08-11 | 中冶节能环保有限责任公司 | A kind of process system and method to ultra-clean dedusting of flue gas of converter |
| CN107090536A (en) * | 2017-06-26 | 2017-08-25 | 辽宁基伊能源科技有限公司 | Dry and wet mixing method converter gas one-time dedusting cleaning system |
| CN107841589A (en) * | 2017-11-20 | 2018-03-27 | 北京京诚科林环保科技有限公司 | Rotary flue device |
| CN108977616A (en) * | 2018-10-12 | 2018-12-11 | 中冶京诚工程技术有限公司 | Converter primary flue gas dry purification and recovery system |
| CN110453033A (en) * | 2019-09-04 | 2019-11-15 | 鞍钢股份有限公司 | Cold state quick starting method for converter dry dedusting system |
| CN115491460A (en) * | 2022-10-17 | 2022-12-20 | 江苏中碳节能技术有限公司 | Converter flue gas treatment system and treatment method |
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| CN110453033B (en) * | 2019-09-04 | 2021-04-02 | 鞍钢股份有限公司 | Cold state quick starting method for converter dry dedusting system |
| CN115491460A (en) * | 2022-10-17 | 2022-12-20 | 江苏中碳节能技术有限公司 | Converter flue gas treatment system and treatment method |
| CN115491460B (en) * | 2022-10-17 | 2024-06-07 | 江苏华和能科技术有限公司 | Converter flue gas treatment system and treatment method |
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Address after: 225267 388 dung North Road, three dung Industrial Park, Fairfax Town, Jiangdu District, Yangzhou, Jiangsu Patentee after: Jiangsu Boji Spraying Systems Holding Co., Ltd. Address before: 225267 388 dung North Road, three dung Industrial Park, Fairfax Town, Jiangdu District, Yangzhou, Jiangsu Patentee before: Boji Spray System Co., Ltd., Jiangsu Prov. |