CN103757176A - Primary flue gas-coal gas dedusting and deep purification system of converter - Google Patents
Primary flue gas-coal gas dedusting and deep purification system of converter Download PDFInfo
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- CN103757176A CN103757176A CN201410035920.7A CN201410035920A CN103757176A CN 103757176 A CN103757176 A CN 103757176A CN 201410035920 A CN201410035920 A CN 201410035920A CN 103757176 A CN103757176 A CN 103757176A
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Abstract
The invention relates to a primary flue gas-coal gas dedusting and deep purification system of a converter. The primary flue gas-coal gas dedusting and deep purification system comprises an evaporating and cooling circular seam washing integrated device and a pneumatic rotational flow deep purification device, wherein the evaporating and cooling circular seam washing integrated device is connected with a vaporizing and cooling flue channel by a high-temperature nonmetallic compensator; the pneumatic rotational flow deep purification device is connected with a fan inlet pipe network; the evaporating and cooling circular seam washing integrated device is provided with an individual circulation water treatment system M; the pneumatic rotational flow deep purification device is provided with an individual circulation water treatment system N; the circulation water treatment system M and the individual circulation water treatment system N are connected in series by a pipeline; supplied water of the circulation water treatment system M is from the circulation water treatment system N. The primary flue gas-coal gas dedusting and deep purification system of the converter, which is provided by the invention, can meet higher dust emission standard or requirement of a coal gas purifying and recycling system of the converter, improve the quality of recycled coal gas, reduce temperature reduction and dedusting water treatment, reduce energy consumption, and improve the system running reliability and safety.
Description
Technical field
The present invention relates to flue gas coal gas dust removal of a kind of converter and deep purifying system, belong to prevention and control of air pollution and coal gas cooling technology field.
Background technology
From October 1, 2012 implementation of the "iron and steel industry air pollutant emission standard Huai" (GB28664-2012), the provisions of the steel companies more stringent air emission control requirements and limits.February 27, 2013, the state has decided to steel, cement and other industries are to begin at different times of atmospheric pollutants emission limits in particular, intensive introduction of air pollutant emission standards and control requirements, not only reveals the current strict environmental pollution Jun situation, and pass a national commitment to environmental pollution.As the converter steelmaking link of one of important source of pollution of iron and steel enterprise, the discharge of flue gas particles of converter be in national standard, list in especially dye thing thing exhausting control location point.
Converter current (flue gas) gas purification and recovery system gas cleaning mode have complete wet OG method, dry wet combined techniques and three kinds of forms of dry method LT method, and the converter gas purification and recovery process moving more than 70% is to be common wet method OG take Japanese OG method technique as the wet-scrubbing equipment of representative.
Conventionally converter generates a large amount of high-temperature gases in oxygen blast smelting process, the features such as converter gas has high temperature, flow is large, dustiness is many, toxic and explosive, wherein main component is generally: CO2, CO, H2, N2, O2 and Ar etc., because stove Inner temperature is higher, adopt while not firing method gas recovery, in furnace gas, the main oxides CO content of carbon on average accounts for 70%.While blowing simultaneously, because the play row of the evaporation of iron under high temperature action, air-flow stir, a variety of causes such as the explosion of CO bubble and splash produces a large amount of stove dirt, its total amount is about the 1%-2% of metal charge, be about 10%--20Kg/t steel, the main component of furnace gas is the dust such as FeO, Fe2O3, CaO, SiO2, dustiness is about 80-160g/Nm3.Its particle diameter major part when furnace gas does not fire is 10
more than m.But the furnace gas producing in the front and back burning phase burns with air mixed after coming out of the stove, its dust contained flue gas particle diameter < 5
m accounts for 60%, relatively traps difficulty large.
The gas purification of wet method saturator literary composition and the recovery system introduced in recent years and digest transplanting are New O G technology, two civilian aditus laryngis have mainly been improved, change R--D, PA class Venturi meter into heavy mound type adjustable annular gap scrubber, cancellation-Wen simultaneously, replaces saturator, its technology maturation, processing unit is simple, easy to operate, particularly technology controlling and process aspect, automatic or manual control is all very safe and reliable.
But its shortcoming is also clearly:
Conventionally OG wet method system resistance damage is high, and in actual use, blower press reaches 24KPa--27 KPa conventionally.
Conventionally OG wet method system comprises that the new OG wet method system cooling and dedusting bath water amount of introduction is still high, and supporting water treating equipment are huge, and maintenance of equipment amount is large, and working cost is high.Water quality is unstable, and adjustable annular gap scrubber aditus laryngis, heavily the equipment unit dust such as stone roller and nozzle, draught fan impeller, pipeline, fouling, latch up phenomenon are serious, and system overhaul workload is large, and potential safety hazard is produced and brought in impact.
Conventionally OG wet method system comprises the new OG wet method system of introduction, while processing large flux flue gas, adopt the adjustable annular gap scrubber of single cover, because of larynx footpath excessive, easily there is air-flow and cloth liquid inequality, heavily cut or polish jade with an emery wheel at high regime poor stability, occur the problems such as vibration bias current, cause regulating mechanism fault, sharpness of regulation to decline, form high resistant poor efficiency.
Conventionally OG wet method system comprises that the new OG wet method system of introduction adopts Venturi scrubber.The efficiency of dust collection of Venturi scrubber depends on the dewatering efficiency of the poly-efficiency of doubting of Venturi meter and water trap, and its dust removal process divides atomization, cohesion and three processes of demist, and the first two process completes in Venturi tube, and demist process completes in mist eliminator.
And conventionally OG wet method system comprises that the new OG wet method system of introduction lays particular stress on Ge and increase simply pressure reduction before and after Venturi scrubber, liquid-gas ratio etc. and improve the efficiency of dust collection of washer, then dehydrating demisting process is generally that 90 ° of elbow separators, dash are pulled water smoke separator, compound gear is pulled the collocation forms such as Off hydrophone, high and dehydrating demisting inefficiency is damaged in resistance, muddy water is carried under one's arms and is happened occasionally, and has aggravated the generation of Zhu for phenomenons such as fouling obstructions.On the other hand, the water trap of OG wet method system and the washing of tower literary composition and process water are same circulating water treatment waterworks conventionally.And overall improved system washing, cooling, process water water quality have raised circulating water treatment cost.In actual moving process, reuse recirculated water suspended substance quality concentration usually exceeds 150mg/L requirement, > 250mg/L even in many situations.In addition from tower literary composition, start flue gas just always in wet state of saturation, moisture content is high, aqueous vapor inferior separating effect, free water content is high, air water is carried under one's arms seriously, and in flue gas, a large amount of washing drops and flushing drop form the free water smoke take dust granules thing as the nucleus of condensation, with flue gas output, diffuse, make common OG wet method system form resistance high, efficiency of dust collection is difficult to the chronic disease improving.Smoke dust discharge concentration conventionally between 80mg/Nm3--100mg/Nm3 and unstable, considerable smoke dust discharge concentration > 100mg/Nm3.Be difficult to adapt to more and more strict national atmosphere pollutants emission standards, be more difficult to the stable smoke dust discharge concentration≤50mg/Nm3 of adaptation or stricter regional environmental quality control criterion.Major part being adopted to OG method gas purification and recovery process, meet stricter energy-saving and emission-reduction requirement, break through gordian technique, promote OG method converter gas purification and recovery process usefulness, is an economy, feasible, technological line efficiently; Promote existing OG method converter gas purification and recovery process usefulness, for new project provides more high performance flue gases purification equipment, guarantee fume emission of converter comprehensively, stablely reach national atmosphere pollutants emission standards requirement and become the urgent task that industry energy conservation reduces discharging.
Summary of the invention
For above-mentioned defect, the object of the present invention is to provide flue gas coal gas dust removal of a kind of converter and deep purifying system, can meet dust emission standard or requirement that converter coal gas purification recovery system is higher, promote the quality of gas recovery, reduce cooling dust-water treatment amount, reduce energy consumption, improve system reliability of operation, security.
The technical solution adopted in the present invention is for this reason:
A kind of flue gas coal gas dust removal of converter and deep purifying system, comprise the transpiration cooling circular seam washing integrated apparatus being connected with gasification cooling flue by Non-Metallic Expansion Joints and the air swirl device for deep cleaning being connected with fans entrance pipe network pipe connecting; Described transpiration cooling circular seam washing integrated apparatus is provided with independently circular water treating system M, described air swirl device for deep cleaning is provided with independently circular water treating system N, circular water treating system M and circular water treating system N are by pipeline A cascade arrangement, and the make up water of described circular water treating system M is from circular water treating system N; It is to access described circular water treating system N by pipeline C that the external source of flue gas coal gas dust removal of described converter and deep purifying system is supplemented new water.
By inclined clapboard, is divided into upper and lower twoth district in described transpiration cooling circular seam washing integrated apparatus, upper district is transpiration cooling district, the inferior segment strength moisture abscission zone of attaching most importance to; Transpiration cooling district is connected by the flue gas thrust-augmenting nozzle of some parallel connections with gravity gas-water separation district; In transpiration cooling district, be provided with some floor water smoke nozzles, wherein lowermost layer is unidirectional water smoke nozzle, is directed upwardly, and other layer is two-way water smoke nozzle, is provided with the two-way water smoke solid nozzle of one deck topmost between two-layer two-way water smoke nozzle; In gravity gas-water separation district, be provided with the adjustable circumferential weld weight washer of some parallel connections, its contraction section entrance is connected with described flue gas thrust-augmenting nozzle lower end respectively, directly over flue gas thrust-augmenting nozzle axle center, be provided with nozzle rotation mixed flow producer and be positioned at unidirectional water smoke nozzle below, between described nozzle rotation mixed flow producer and flue gas thrust-augmenting nozzle, be provided with the unidirectional spraying nozzle of one deck, described unidirectional spraying nozzle direction is downward along flue gas thrust-augmenting nozzle axle center;
Described air swirl device for deep cleaning comprises the upper cone, some air swirl cleaners being connected in parallel and the compound baffle water trap that connect successively from top to bottom, described air swirl cleaner comprises separator cartridge, in separator cartridge, be provided with some layers of aerosol separating spiral-flow plate and some layers of air swirl plate are arranged from top to bottom, aerosol separating spiral-flow plate and pneumatic spiral board are equipped with flooding nozzle and spraying nozzle up and down, and the upper and lower two ends of separator cartridge are all connected with upper cone and compound baffle water trap respectively by telescopic joint;
Top, gravity gas-water separation district is connected with compound baffle water trap with Wen's ejection-type pipe connecting by metal compensator.
In the inlet end of described Wen's ejection pipe connecting, be provided with two-fluid aerial fog nozzle.
The spray angle of described two-way water smoke solid nozzle is less than the spray angle of two-way water smoke nozzle.
Described adjustable circumferential weld weight washer comprises heavily stone roller, hydraulic efficiency servo-gear and guide rod of adjustable annular gap scrubber body, liftable.
Described nozzle rotation mixed flow producer comprises permanent joint, core bar, rotary nozzle and fin, in described core bar, be connected in permanent joint inner chamber, core bar lower end is through permanent joint, core bar lower end cylindrical cover has crossover sub, crossover sub lower end cylindrical socket rotary nozzle, between core bar and permanent joint inwall, being provided with sleeve is connected on permanent joint inwall, core bar upper end is provided with boss, between boss lower surface and sleeve upper end, be provided with ball I, between crossover sub upper end and core bar outer wall, be provided with groove, in groove, be provided with ball II, on rotary nozzle sidewall, be arranged with two fins, on rotary nozzle sidewall, along Inner chamber sidewall tangent line, be arranged with eccentric wire plug-flow spout between two fins, rotary nozzle lower end is provided with water fog applicator.
Described nozzle rotation mixed flow producer has spraying, rotation, mixed flow, self-cleaning function, increases the disturbance of flue gas, increases between grit, droplet elastic collision occurs mutually, accelerates cohesion, sedimentation and heat transfer process of cooling.
Described nozzle rotation mixed flow producer is heavily cut or polish jade with an emery wheel online conveying good antiscale property mixed liquid by the negative pressure of flue gas thrust-augmenting nozzle to aditus laryngis and the liftable of adjustable circumferential weld weight washer, the loose fouling that acts on key positions such as effectively preventing that adjustable annular gap scrubber aditus laryngis and liftable are heavily cut or polish jade with an emery wheel of huge legendary turtle splitting or integrating of Scale inhibitors occurs, thereby promotes and stablize adjustable circumferential weld weight washer to the smart dedusting of flue gas and cooling usefulness.
It is the supernatant liquor of getting its circular water treating system N that the spraying of described nozzle rotation mixed flow producer is supplied water, according to the concrete water quality such as its recirculated water basicity, pH value, consumption, cutting off separately the suitable dosing technique of employing that has emphasis in pond, adjust pH value, add scale inhibitor allotment to form.
In described gravity gas-water separation district, the flue gas reduction of speed upwards certain distance of transferring arranges one group of water fog spraying gun Ge aerosol spray gun, in flue gas, inject a large amount of water at low temperature fog cooling stream, small droplet take dust granules thing as core in flue gas and water smoke collision, cohesion, sedimentation, colleague flue gas in vapour stream undergo phase transition, steam condensation, grow up, sedimentation, further improve the efficiency of elementary gravity gas-water separation, for air swirl deep purifying provides favourable condition.
On described air swirl cleaner, be also provided with manhole, before opening and inspecting, by the gas stop valve on air swirl cleaner and the operation of coal gas diffusion pipe, carry out nitrogen purging, reach conveniently safety and open and inspect.
The water supply of described transpiration cooling circular seam washing integrated apparatus meets self-circulating water treatment system M, and blow-off pipe I flows into sump after entering Self-cleaning type water lute drainer I, then enters in circular water treating system M.
The water supply of described air swirl device for deep cleaning meets self-circulating water treatment system N, and blow-off pipe II enters in circular water treating system N after entering Self-cleaning type water lute drainer II.
The make up water of described circular water treating system M is from circular water treating system N, and the supplementary new water of flue gas coal gas dust removal of described converter and deep purifying system external source is to access described circular water treating system N by pipeline C.
Described two-fluid aerial fog nozzle is connected with water purification interface and nitrogen interface.Flue gas coal gas dust removal of described converter and deep purifying system are supplemented new water from pipeline C, by circular water treating system N.
Advantage of the present invention is:
1, the present invention is by adopting Non-Metallic Expansion Joints, under high temperature and frequent variations condition, can adapt to the horizontal and vertical displacement of gasification cooling flue, have release effect concurrently, without any need for medium and maintenance, the overflow water seal operation of comparing common OG is safer, reliable, economical.
2, in transpiration cooling circular seam washing integrated apparatus, the first layer arranges bidirectional hollow spraying nozzle, in smelting cycle, make on the one hand dry wet intersection effectively be rinsed, on making on the other hand between cooling zone, move, strengthening fire extinguishing cooling effect, also reduced Non-Metallic Expansion Joints surface temperature simultaneously, compare common OG system and adopt unidirectional downward nozzle safer, make the longer service life of Non-Metallic Expansion Joints and bidirectional hollow spraying nozzle.
3, in transpiration cooling circular seam washing integrated apparatus, the second layer arranges two-way solid spraying nozzle, , and the spray angle of two-way solid spraying nozzle is less than the spray angle of the first layer bidirectional hollow spraying nozzle, entrance go out water smoke density and the intensity of region fire cooling have greatly been increased, and mist droplet particle size is moderate, vaporator rate and the evaporation temperature drop ratio at smoke inlet place have been improved, shortened bottom offset between high temperature evaporation cooling zone, for the descending continuation transpiration cooling of flue gas, the room and times that obtain are won in scrubbing dust collection more, in transpiration cooling and the saturated cooling and space of depositing, in same room and time, reach same cooling target value, due to the raising of vaporator rate and evaporation temperature drop ratio, comparing the common OG systemic circulation water yield will greatly reduce.
4, above bottom, transpiration cooling district and flue gas thrust-augmenting nozzle, set up nozzle rotation mixed flow producer, utilize the spraying of nozzle rotation mixed flow producer, rotation, mixed flow and self-cleaning function, drive flue gas around to produce and stir along axle center, increase the disturbance of flue gas, between grit and droplet, mutually there is elastic collision, accelerate cohesion, sedimentation and heat transfer process of cooling, the eddy flow disturbance that flue gas produces along nozzle rotation mixed flow producer water smoke outlet axle center, make descender muddy water in tower radially to the bias current of tower wall, fall to base plate, the muddy water of minimizing in flue gas thrust-augmenting nozzle enters adjustable circumferential weld weight washer, the spraying of nozzle rotation mixed flow producer has on-line cleaning effect to self bilateral fin.
5, utilize nozzle rotation mixed flow producer spraying, rotation function, by the negative pressure of mixed flow flue gas thrust-augmenting nozzle, to aditus laryngis and the liftable of adjustable circumferential weld weight washer, heavily cut or polish jade with an emery wheel online conveying good antiscale property mixed liquid, the loose fouling that acts on key positions such as effectively preventing that adjustable annular gap scrubber aditus laryngis and liftable are heavily cut or polish jade with an emery wheel of huge legendary turtle splitting or integrating of Scale inhibitors occurs, thereby promotes and stablize adjustable circumferential weld weight washer to the smart dedusting of flue gas and cooling usefulness.
6, in gravity gas-water separation district, the flue gas reduction of speed upwards certain distance of transferring arranges one group of water fog spraying gun Ge aerosol spray gun, utilizes dust-laden steam phase transforming to remove particulate matter principle.Flue gas after adjustable circumferential weld weight washer purifies is dust-laden vapour stream flue gas, relative humidity 100%, flue gas enters gravity gas-water separation district, through reduction of speed, turnover changes direction and completes elementary gravity dehydration, the sedimentation of macrobead mud-water separation, at transfer upwards-set a distance of flue gas reduction of speed setting-group water fog spraying gun, in this dust-laden steam flow flue gas, inject a large amount of water at low temperature fog cooling steam flow flue gases, small droplet and water smoke take dust granules thing as core in steam flow flue gas clash into, cooling, dust-laden steam flow undergoes phase transition to doubt to tie grows up, the thin water fog particle flocking settling of dust-laden, the small droplet that is core by the dust granules thing carrying in flue gas is degraded to minimum content, further improve the efficiency of elementary gravity gas-water separation.Compare the gravity muddy water trap that new OG wet method system that common OG wet method system comprises introduction is provided with, gas-water separation efficiency is higher more thorough.
7, the present invention adopts the adjustable circumferential weld weight washer of some parallel connections, can meet and purify large exhaust gas volumn requirement, be conducive to relate to stdn and the steady quality control of manufacturing processed, on the same circular section of tower, be arranged in parallel multiple adjustable circumferential weld weight washer aditus laryngis, can obtain longer circumferential weld, more stable accurate gas speed adjusting function, thus higher, more stable smart dust removing effects obtained.
8, in the gravity gas-water separation district of the present invention in transpiration cooling circular seam washing device, by gravity settling and water smoke condensation, cohesion, washing, the small droplet that is core by the dust granules thing carrying in flue gas is degraded to minimum content, allow comparatively clean flue gas enter again in air swirl device for deep cleaning, through compound baffle water trap and air swirl cleaner, thereby flue gas is diffused to dust emission concentration is stable to be controlled at≤below 50mg/m3, the Controlling System operating parameter of being correlated with, smoke emissioning concentration reaches≤below 30mg/m3.
9, the present invention adopts tandem supplying water in different qualities, draining, and transpiration cooling circular seam washing integrated apparatus and air swirl device for deep cleaning are respectively equipped with independently circular water treating system M and circular water treating system N, and by pipeline A cascade arrangement.The supplementary new water of flue gas coal gas dust removal of described converter and deep purifying system external source is to access described circular water treating system N by pipeline C.
The independent circular water treating system arranging of transpiration cooling circular seam washing integrated apparatus blowdown access, after processing, recycle, mud is transported to sludge treatment workshop section and focuses on, and part of contaminated water is arranged outward, and moisturizing connects from air swirl device for deep cleaning circular water treating system.
The independent circular water treating system arranging of air swirl device for deep cleaning blowdown access, recycles after processing, its circular water treating system blowdown access transpiration cooling circular seam washing integrated apparatus circular water treating system.Moisturizing connects from new water recharging system.
Adopt as above tandem supplying water in different qualities, draining, be convenient to distinguish different feedwater requirements, adopt different treatment technique.Can guarantee the water supply quality of special requirement, and high water quality circulating water treatment amount is few, systemic circulation water treating equipment capital cost and running cost are corresponding significantly to be reduced.
Conventionally adopt this patent technique to the former OG system reform, because the sewer shunting of different suspended substance quality concentration accesses separately independently circular water treating system, in addition improve vaporator rate and evaporation temperature drop ratio, high suspended matter mass concentration sewer circular treatment amount reduces 1/2 than common former OG system, significantly reduces circular water treating system working cost.Because flue gas enters before air swirl device for deep cleaning dust content in 50mg/m3 left and right, in refining plant discharge waste water itself, suspended substance quality concentration is lower, water treatment system working cost is relatively low, also can carry out at the scene simple filtration treatment nearby.Compared with common former OG system: comprehensive water treatment system working cost reduces 20%.
10, the present invention is by adopting different Sprayables and nozzle rotation mixed flow producer method being set in the transpiration cooling district in transpiration cooling circular seam washing device, shorten bottom offset between high temperature evaporation cooling zone, obviously improved the vaporator rate of flue gas in tower and evaporation temperature drop ratio and washing cooling-down effect.In system, 900 ℃ of left and right flue gases enter in transpiration cooling district, and node control temperature is down to 90 ℃ of-100 ℃ of left and right, enter gravity gas-water separation district temperature and be down to 64 ℃ of left and right after adjustable circumferential weld weight washer.On the one hand due to tower literary composition unification tower, system meets to be avoided containing CO gaseous detonation temperature range condition, the while mechanism of utilizing transpiration cooling temp .-lowering water-saving again more, one subtracts an increasing on the other hand, it is the eddy flow disturbance that nozzle rotation mixed flow producer water smoke outlet axle center produces, make descender muddy water in tower radially to the bias current of tower wall, fall to base plate, minimizing enters the muddy water of adjustable circumferential weld weight washer Inner through flue gas thrust-augmenting nozzle, one increasing is conducive to transpiration cooling district Inner saturation steam formed more, more saturation steams are input to adjustable circumferential weld weight washer, increase the steam water smoke that enters adjustable circumferential weld weight washer Inner.The steam flow flue gas that in tower, high-temperature flue gas transpiration cooling forms passes through the water smoke of flue gas thrust-augmenting nozzle and high-velocity jet under negative pressure is done, the scale inhibitor mixed liquid mist that nozzle rotation mixed flow producer sprays into is incorporated to flue gas thrust-augmenting nozzle, flue gas thrust-augmenting nozzle entrance sudden change of flow speed, strong turbulent flow occurs between water smoke and steam flow flue gas to be contacted, steam phase transforming, the saturation steam condensation phase transformation effects that utilize tower (literary composition) temperature-fall period to form of this process more, the system setting up separately than common OG tower literary composition reduces water loss 20%, efficiency of dust collection also significantly improves because importing steam flow water smoke, really embody the water saving of tower literary composition integrative-structure, high-effective dust-removing effect.Next make full use of the efficient heat transfer mass transfer of adjustable circumferential weld weight washer and the control characteristic of pressure reduction, flue gas enters gravity gas-water separation district after same tower Inner is by the adjustable annular gap scrubber scrubbing dust collection cooling of parallel connection, owing to adopting gravity separation to add the condensation of low temperature water smoke, washing principle, make the thin water fog particle of dust-laden obtain abundant flocking settling, temperature out is down to 64 ℃ of left and right, pass through again the multistage scrubbing dust collection of air swirl device for deep cleaning, strengthen dewatering demist, exhanst gas outlet temperature is down to 56 ℃--and 58 ℃, than common OG system low 6 ℃ of left and right of temperature out after dehydration tower dehydration, coal gas enters the long-pending minimizing 11% of cabinet, mean that existing gas chamber holds, can store more coal gas, be beneficial to the contradiction solving between aerogenesis and user, .Moreover, saturated water capacity is relevant with flue-gas temperature and pressure, and flue gas pressures is relatively low in whole OG system, so flue-gas temperature has the greatest impact to water capacity, in flue gas, moisture content will reduce and reduce with flue-gas temperature, free-water small droplet is also due to washing and depositing, compare, the present invention is that in flue gas, saturated moisture content reduces by 42% than moisture content in common OG system flue gas, during gas recovery, significantly reduce the water content in coal gas, improve caloric power of gas, greatly reduce with wet flue gas output loss moisture, reduce systemic circulation water consumption and water treatment expense, ton molten steel cost 30%.
11, compared with traditional OG wet method system: in transpiration cooling circular seam washing integrated apparatus, flue gas from top to bottom, unit equipment is few, system flow compactness, Yi Yu Victoria pillar reason, resistance is damaged little, two civilian Bian circular seam washing technology, efficiency of dust collection is high, is easy to regulate control operation safety and reliability, energy recovery is stable, and extend work-ing life.
12, with the comparison of existing common OG wet method: the resistance of converter dust-removing and deep purifying system is damaged and reduced by 28%, when reducing discharging, to take into account energy-conservationly, blower fan power power consumption reduces greatly, estimates 1.2 KWhs/ton of steel of economize on electricity, ton molten steel cost 50%.Because discharge dust contained flue gas concentration is low, can significantly 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.Raising system reliability of operation, security.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of nozzle rotation mixed flow producer in Fig. 1.
Fig. 3 is the vertical view of Fig. 2.
In figure, 1 is Non-Metallic Expansion Joints, the 2nd, gasification cooling flue, the 3rd, fans entrance pipe network pipe connecting, the 4th, inclined clapboard, the 5th, flue gas thrust-augmenting nozzle, the 6th, unidirectional water smoke nozzle, the 7th, two-way water smoke nozzle, the 8th, two-way water smoke solid nozzle, the 9th, converter, the 10th, nozzle rotation mixed flow producer, the 11st, unidirectional spraying nozzle, the 12nd, upper cone, the 13rd, compound baffle water trap, the 14th, separator cartridge, the 15th, aerosol separating spiral-flow plate, the 16th, air swirl plate, the 17th, flooding nozzle, the 18th, spraying nozzle, the 19th, telescopic joint, the 20th, metal compensator, the 21st, Wen's ejection-type pipe connecting, the 22nd, two-fluid aerial fog nozzle, the 23rd, adjustable annular gap scrubber body, the 24th, liftable is heavily cut or polish jade with an emery wheel, the 25th, hydraulic efficiency servo-gear, the 26th, guide rod, the 27th, permanent joint, the 28th, core bar, the 29th, rotary nozzle, the 30th, fin, the 31st, crossover sub, the 32nd, sleeve, the 33rd, ball I, the 34th, ball II, the 35th, plug-flow spout, the 36th, water fog applicator, the 37th, water fog spraying gun, the 38th, gas stop valve, the 39th, coal gas diffusion pipe, the 40th, blow-off pipe I, the 41st, Self-cleaning type water lute drainer I, the 42nd, blow-off pipe II, the 43rd, Self-cleaning type water lute drainer II, the 44th, water purification interface, the 45th, nitrogen interface.
Embodiment
A kind of flue gas coal gas dust removal of converter and deep purifying system, comprise the transpiration cooling circular seam washing integrated apparatus being connected with gasification cooling flue 2 by Non-Metallic Expansion Joints 1 and the air swirl device for deep cleaning being connected with fans entrance pipe network pipe connecting 3; Described transpiration cooling circular seam washing integrated apparatus is provided with independently circular water treating system M, described air swirl device for deep cleaning is provided with independently circular water treating system N, circular water treating system M and circular water treating system N are by pipeline A cascade arrangement, and the make up water of described circular water treating system M is from circular water treating system N; It is to access described circular water treating system N by pipeline C that the external source of flue gas coal gas dust removal of described converter and deep purifying system is supplemented new water.
By inclined clapboard 4, is divided into upper and lower twoth district in described transpiration cooling circular seam washing integrated apparatus, upper district is transpiration cooling district, the inferior segment strength moisture abscission zone of attaching most importance to; Transpiration cooling district is connected by the flue gas thrust-augmenting nozzle 5 of some parallel connections with gravity gas-water separation district, in transpiration cooling district, be provided with some floor water smoke nozzles, wherein lowermost layer is unidirectional water smoke nozzle 6, be directed upwardly, other layer is two-way water smoke nozzle 7, is provided with the two-way water smoke solid nozzle 8 of one deck topmost between two-layer two-way water smoke nozzle 7; In gravity gas-water separation district, be provided with the adjustable circumferential weld weight washer of some parallel connections, its contraction section entrance is connected with described flue gas thrust-augmenting nozzle 5 lower ends respectively, directly over flue gas thrust-augmenting nozzle 5 axle center, be provided with nozzle rotation mixed flow producer 10 and be positioned at unidirectional water smoke nozzle 6 belows, between described nozzle rotation mixed flow producer 10 and flue gas thrust-augmenting nozzle 5, be provided with the unidirectional spraying nozzle 11 of one deck, described unidirectional spraying nozzle 11 directions are downward along flue gas thrust-augmenting nozzle 5 axle center;
Described air swirl device for deep cleaning comprises the upper cone 12, some air swirl cleaner and the compound baffle water traps 13 of being connected in parallel that connect successively from top to bottom, described air swirl cleaner comprises separator cartridge 14, in separator cartridge 14, be provided with some layers of aerosol separating spiral-flow plate 15 and some layers of air swirl plate 16 are arranged from top to bottom, aerosol separating spiral-flow plate 15 and pneumatic spiral board 16 are equipped with flooding nozzle 17 and spraying nozzle 18 up and down, and separator cartridge is all connected with upper cone 12 and compound baffle water trap 13 respectively by telescopic joint 19 at two ends Shang Xia 14;
Top, gravity gas-water separation district is connected with compound baffle water trap 13 with Wen's ejection-type pipe connecting 21 by metal compensator 20.
In the inlet end of described Wen's ejection pipe connecting 21, be provided with two-fluid aerial fog nozzle 22.
The spray angle of described two-way water smoke solid nozzle 8 is less than the spray angle of two-way water smoke nozzle 7.
Described adjustable circumferential weld weight washer comprises that adjustable annular gap scrubber body 23, liftable heavily cut or polish jade with an emery wheel 24, hydraulic efficiency servo-gear 25 and guide rod 26.
Described nozzle rotation mixed flow producer 10 comprises permanent joint 27, core bar 28, rotary nozzle 29 and fin 30, in described core bar 28, be connected in permanent joint 27 inner chambers, core bar 28 lower ends are through permanent joint 27, core bar 28 lower end cylindrical covers have crossover sub 31, crossover sub 31 lower end cylindrical socket rotary nozzles 29, between core bar 28 and permanent joint 27 inwalls, being provided with sleeve 32 is connected on permanent joint 27 inwalls, core bar 28 upper ends are provided with boss, between boss lower surface and sleeve 32 upper ends, be provided with ball I33, between crossover sub 31 upper ends and core bar 28 outer walls, be provided with groove, in groove, be provided with ball II34, on rotary nozzle 29 sidewalls, be arranged with two fins 30, on rotary nozzle 29 sidewalls, along intracavity sidewall tangent line, be arranged with the plug-flow spout 35 of eccentric wire and between two fins 30, rotary nozzle 29 lower ends are provided with water fog applicator 36.
Described nozzle rotation mixed flow producer 10 has spraying, rotation, mixed flow, self-cleaning function, increase the disturbance of flue gas, increase the mutual elastic collision that occurs between grit, droplet, accelerate cohesion, sedimentation and heat transfer process of cooling, and the negative pressure by flue gas thrust-augmenting nozzle 5 heavily cuts or polish jade with an emery wheel the 24 online good antiscale property mixed liquids of carrying to aditus laryngis and the liftable of adjustable circumferential weld weight washer, thereby promote and stablize smart dedusting and the cooling effect of adjustable circumferential weld weight washer to flue gas.
It is the supernatant liquor of getting its circular water treating system N that 10 sprayings of described nozzle rotation mixed flow producer are supplied water, according to the concrete water quality such as its recirculated water basicity, pH value, consumption, cutting off separately the suitable dosing technique of employing that has emphasis in pond, adjust pH value, add scale inhibitor allotment to form.
In described gravity gas-water separation district, the flue gas reduction of speed upwards certain distance of transferring arranges one group of water fog spraying gun 37, in flue gas, inject a large amount of water at low temperature fog cooling stream, small droplet take dust granules thing as core in flue gas and water smoke collision, cohesion, sedimentation, colleague flue gas in vapour stream undergo phase transition, steam condensation, grow up, sedimentation, further improve the efficiency of elementary gravity gas-water separation, for air swirl deep purifying provides favourable condition.
On described air swirl cleaner, be also provided with manhole, before opening and inspecting, by the gas stop valve 38 on air swirl cleaner and 39 operations of coal gas diffusion pipe, carry out nitrogen purging, reach conveniently safety and open and inspect.
The water supply of described transpiration cooling circular seam washing integrated apparatus meets self-circulating water treatment system M, and blow-off pipe I40 flows into sump after entering Self-cleaning type water lute drainer I41, then enters in circular water treating system M.
The water supply of described air swirl device for deep cleaning meets self-circulating water treatment system N, and blow-off pipe II42 enters in circular water treating system N after entering Self-cleaning type water lute drainer II43.
The make up water of described circular water treating system M is from circular water treating system N, and the supplementary new water of flue gas coal gas dust removal of described converter and deep purifying system external source is to access described circular water treating system N by pipeline C.
Described two-fluid aerial fog nozzle 22 is connected with water purification interface 44 and nitrogen interface 45.
Embodiment 1
The high-temperature flue gas that converter 9 fire door places produce, through movable gas hood, trap, after gasification cooling flue 2 cooling downs, temperature drops to 900 ℃ of left and right by 1450 ℃-1600 ℃, first by Non-Metallic Expansion Joints 1, enter in the transpiration cooling district in transpiration cooling circular seam washing device, in transpiration cooling district, be provided with some floor water smoke nozzles, wherein lowermost layer is unidirectional water smoke nozzle 6, be directed upwardly, other layer is two-way water smoke nozzle 7, between two-layer two-way water smoke nozzle 7, be provided with the two-way water smoke solid nozzle 8 of one deck topmost, the jet angle of two-way water smoke solid nozzle 8 is less than the jet angle of two-way water smoke nozzle 7, increased greatly water smoke density and intensity in entrance fire extinguishing cooling region, and mist droplet particle size is moderate, vaporator rate and the evaporation temperature drop ratio at smoke inlet place have been improved, shorten bottom offset between high temperature evaporation cooling zone, for the descending continuation transpiration cooling of flue gas, more room and time is won in scrubbing dust collection, the high-density water smoke heat absorption evaporation that high-temperature flue gas sprays through the two-way water smoke nozzle 7 of the first layer and the two-way water smoke solid nozzle 8 of the second layer obtains fast cooling, flue-gas temperature drops to rapidly 200 ℃ of left and right by 900 ℃ of left and right, by setting up plurality of layers of double, to water smoke nozzle 7 and the unidirectional water smoke nozzle 6 of the lowest layer, combine, the water smoke of ejection forms high-density mist net mist film, dust is by the wetting sedimentation of water smoke.
Flue gas continues descending, between bottom, transpiration cooling district and flue gas thrust-augmenting nozzle 5, set up nozzle rotation mixed flow producer 10 and there is spraying, rotation, mixed flow, self-cleaning function, increase the disturbance of flue gas, increase grit, between droplet, mutually there is elastic collision, accelerate cohesion, sedimentation and heat transfer process of cooling, and to aditus laryngis and the liftable of adjustable circumferential weld weight washer, heavily cut or polish jade with an emery wheel the 24 online good antiscale property mixed liquids of carrying by the negative pressure of flue gas thrust-augmenting nozzle 5, effectively prevent aditus laryngis, circumferential weld and liftable weight surface scale, thereby promote and stablize smart dedusting and the cooling effect of adjustable circumferential weld weight washer to flue gas.
Flue-gas temperature is down to 90 ℃ of-100 ℃ of left and right in the bottom in transpiration cooling district node control temperature.
Flue gas thrust-augmenting nozzle 5 ingress are provided with the unidirectional spraying nozzle 11 of one deck, for adjustable circumferential weld weight washer provides pre-atomization washings.The vapour stream flue gas that in tower, high-temperature flue gas transpiration cooling forms is incorporated in flue gas thrust-augmenting nozzle 5 by flue gas thrust-augmenting nozzle 5 and the scale inhibitor mixed liquid mist that water smoke and the nozzle rotation mixed flow producer 10 of high-velocity jet spray under suction function,, between water smoke and vapour stream flue gas, there is strong turbulent flow and contact in flue gas thrust-augmenting nozzle 5 entrance sudden change of flow speed.
Flue gas enters the smart dedusting and the heat transfer process of cooling that in adjustable circumferential weld weight washer, realize gas purification recovery under the suction function of blower fan subsequently, adjustable circumferential weld weight washer has two kinds of functions that regulate tolerance and purify cooling coal gas, according to converter 9 fire door differential pressure signals, servo apply hydraulic pressure mechanism 25 heavily cuts or polish jade with an emery wheel 24 by the adjustable circumferential weld weight washer of actuating mechanism controls lower end liftable again and moves up and down, coal gas is carried out to the control of dust content of gas by the size of adjustable circumferential weld weight washer contact area, control the dense 50mg/Nm3 of coal-gas recovering dust-laden, discharge dust content is lower than 30mg/Nm3.
The strength moisture abscission zone of attaching most importance to, adjustable circumferential weld weight washer lower end.
Flue gas after adjustable circumferential weld weight washer purifies is dust-laden vapour stream flue gas, relative humidity 100%, flue gas enters in gravity gas-water separation district, through reduction of speed, turnover changes direction and completes elementary gravity dehydration, first separate and subside of macrobead muddy water, at the flue gas reduction of speed upwards certain distance of transferring, one group of water fog spraying gun 37 is set, hydraulic pressure 0.5MPa, in dust-laden vapour stream flue gas, inject a large amount of low temperature water smoke, small droplet and water smoke take dust granules as core in vapour stream flue gas clash into, cooling, dust-laden steam generation phase transformation condensation growth, the thin water fog particle flocking settling of dust-laden, further improve the efficiency of elementary gravity gas-water separation.
Flue gas after primary purifying enters in compound baffle water trap 13 by metal compensator 20, Wen's ejection-type pipe connecting 21 under the suction function of blower fan, Wen's ejection-type pipe connecting 21 front ends arrange two-fluid aerial fog nozzle 22, two-fluid aerial fog nozzle 22 is connected with water purification interface 45 and nitrogen interface 46, flue gas carries the expansion cohesion through Wen's ejection-type pipe connecting 21 of aerosol that two-fluid aerial fog nozzle 22 injects, with certain speed, enter in compound baffle water trap 13, complete the further high efficiency separation of air water.
Flue gas after purification enters in air swirl cleaner from bottom to top, on air swirl plate 16 therein, along center blind plate bilateral cloth liquid, on air swirl plate 16, vaporific drop big area is disperseed, form liquid film, liquid net, form the physical processes such as strong stirring, remix, cohesion, high efficiency separation with rotation gas-liquid upwards, remove the fine dust in flue gas, realize the deep purifying of flue gas.Flue gas after air swirl plate 16 deep purifyings again separator cartridge 14 inward turnings turn to, through aerosol separating spiral-flow plate 15, complete gas, liquid and separate, the cohesion of liquid stream forms moisture film and under narrow annular channel, lets out and enter compound baffle water trap 13 further washing is Fen Li with aqueous vapor.
On described air swirl cleaner, be also provided with manhole, before opening and inspecting, by the gas stop valve 38 on air swirl cleaner and 39 operations of coal gas diffusion pipe, carry out nitrogen purging, reach conveniently safety and open and inspect.
Flue gas after deep purifying enters in fans entrance pipe network pipe connecting 3 under the suction function of blower fan, by the centrifugal blower three-way switch valve that boosts.When flue gas meets recovering condition, flue gas switches to water seal inverted valve by T-valve, after water seal inverted valve and gas holder import water seal, is sent to gas chamber, then by the booster fan of Gas Pressurization Station, gas pressing is sent to each user; When flue gas does not meet recovering condition, flue gas switches to diffusing chimney through by-pass valve, T-valve, then by blowdown stack ignition bleeding.
The data that coal gas dust removal of a kind of converter and deep purifying system are carried out gas purification recovery are as follows:
Take 120T converter as example:
120 tons of BOF nominal capacities
144 tons of the maximum taps of converter
135 tons of the average taps of converter
Average smelting cycle 37min
The maximum decarbonization rate 0.45%/min of converter
Exhaust gas volumn: 8 × 104 ~ 10 × 104Nm3/h
Flue-gas temperature: 750--1000 ℃
Raw flue gas dust content: 100 ~ 150g/ Nm3
Converter gas adopts and does not fire method processing, coal-gas recovering, coefficient of excess air а=0.1.
Inlet flue gas parameter
Inlet flue gas amount: 90000Nm3/h
Entrance flue gas temperature: 900 ℃
Inlet flue gas humidity: dry gas
Inlet flue gas dustiness: 120g/ Nm3
Inlet flue gas pressure :-0.5kPa
Outlet Gas Parameters
Exit gas temperature: 56 ℃
Outlet smoke moisture: 100%
Outlet flue gas pressures :-15..3kPa
Transpiration cooling circular seam washing integrated apparatus
Injection flow rate 480t/h
The nozzle rotation mixed flow producer 10 mixed liquid water yield of spraying is 3.4t/h, hydraulic pressure 0.3MPa.
Air swirl device for deep cleaning
Injection flow rate 130t/h
After gas cleaning, discharge dust content 26mg/Nm3(mark condition).
Take 260T converter as example:
BOF nominal capacity 260t
The maximum tap 265 t/ stoves of molten iron
Original maximum furnace gas amount 13.4 × 104Nm3/h
Exhaust gas volumn: 14 × 104 ~ 16 × 104Nm3/h
Inlet temperature ~ 900 ℃
Air swirl device for deep cleaning outlet Gas Parameters
Outlet exhaust gas volumn 30 × 104m3/h
Exit gas temperature: 58 ℃
Outlet flue gas relative humidity: 100%
Outlet flue gas pressures :-14.5kPa
Transpiration cooling circular seam washing integrated apparatus
Injection flow rate 712 t/h
Two cover nozzle rotation mixed flow producers 10
The spraying mixed liquid water yield is 6.7t/h, hydraulic pressure 0.3MPa.
The adjustable annular gap scrubber parallel connection of two covers
Air swirl device for deep cleaning
Injection flow rate 200t/h
After coal gas dust removal of converter and deep purifying system dust removing and deep purifying, in the actual measurement of chimney environmental protection measuring point, diffuse dust contained flue gas concentration lower than 38 mg/m3.
As above embodiment, if flue gas is diffused, dust emission concentration is stable to be controlled at below 50mg/m3, coal gas dust removal of converter and deep purifying system can meet the demands described in configuration this patent.< 14.5KPa, blower press < 22KPa are damaged in combination unit system resistance simultaneously.The configurable more lower powered blower fan power of system.
Above; it is only the preferred embodiment of patent of the present invention; but protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the present invention disclose technical scope in; pass through-Ding professional technique and theoretical understanding; the variation that can expect easily or replacement, all should be encompassed in guarantor of the present invention and expand in scope, and therefore guarantor of the present invention expands scope and is as the criterion with the protection domain that claim was defined.
Claims (8)
1. flue gas coal gas dust removal of a converter and deep purifying system, it is characterized in that, comprise the transpiration cooling circular seam washing integrated apparatus being connected with gasification cooling flue by Non-Metallic Expansion Joints and the air swirl device for deep cleaning being connected with fans entrance pipe network pipe connecting; Described transpiration cooling circular seam washing integrated apparatus is provided with independently circular water treating system M, described air swirl device for deep cleaning is provided with independently circular water treating system N, circular water treating system M and circular water treating system N are by pipeline A cascade arrangement, and the make up water of described circular water treating system M is from circular water treating system N; It is to access described circular water treating system N by pipeline C that the external source of flue gas coal gas dust removal of described converter and deep purifying system is supplemented new water;
By inclined clapboard, is divided into upper and lower twoth district in described transpiration cooling circular seam washing integrated apparatus, upper district is transpiration cooling district, the inferior segment strength moisture abscission zone of attaching most importance to; Transpiration cooling district is connected by the flue gas thrust-augmenting nozzle of some parallel connections with gravity gas-water separation district; In transpiration cooling district, be provided with some floor water smoke nozzles, wherein lowermost layer is unidirectional water smoke nozzle, is directed upwardly, and other layer is two-way water smoke nozzle, is provided with the two-way water smoke solid nozzle of one deck topmost between two-layer two-way water smoke nozzle; In gravity gas-water separation district, be provided with the adjustable circumferential weld weight washer of some parallel connections, its contraction section entrance is connected with described flue gas thrust-augmenting nozzle lower end respectively, directly over flue gas thrust-augmenting nozzle axle center, be provided with nozzle rotation mixed flow producer and be positioned at unidirectional water smoke nozzle below, between described nozzle rotation mixed flow producer and flue gas thrust-augmenting nozzle, be provided with the unidirectional spraying nozzle of one deck, described unidirectional spraying nozzle direction is downward along flue gas thrust-augmenting nozzle axle center;
Described air swirl device for deep cleaning comprises the upper cone, some air swirl cleaners being connected in parallel and the compound baffle water trap that connect successively from top to bottom, described air swirl cleaner comprises separator cartridge, in separator cartridge, be provided with some layers of aerosol separating spiral-flow plate and some layers of air swirl plate are arranged from top to bottom, aerosol separating spiral-flow plate and pneumatic spiral board are equipped with flooding nozzle and spraying nozzle up and down, and the upper and lower two ends of separator cartridge are all connected with upper cone and compound baffle water trap respectively by telescopic joint;
Top, gravity gas-water separation district is connected with compound baffle water trap with Wen's ejection-type pipe connecting by metal compensator.
2. flue gas coal gas dust removal of a kind of converter according to claim 1 and deep purifying system, is characterized in that, in the inlet end of described Wen's ejection pipe connecting, is provided with two-fluid aerial fog nozzle.
3. flue gas coal gas dust removal of a kind of converter according to claim 1 and deep purifying system, is characterized in that, the spray angle of described two-way water smoke solid nozzle is less than the spray angle of two-way water smoke nozzle.
4. flue gas coal gas dust removal of a kind of converter according to claim 1 and deep purifying system, it is characterized in that, the adjustable circumferential weld weight washer of described some parallel connections comprises adjustable annular gap scrubber body, heavily stone roller, hydraulic efficiency servo-gear and the guide rod of liftable of some parallel connections.
5. flue gas coal gas dust removal of a kind of converter according to claim 1 and deep purifying system, it is characterized in that, the described gravity gas-water separation district Inner flue gas reduction of speed upwards certain distance of transferring arranges one group of water fog spraying gun Ge aerosol spray gun, direction, is injected a large amount of water at low temperature fog cooling stream down in flue gas.
6. flue gas coal gas dust removal of a kind of converter according to claim 1 and deep purifying system, it is characterized in that, described nozzle rotation mixed flow producer comprises permanent joint, core bar, rotary nozzle and fin, in described core bar, be connected in permanent joint inner chamber, core bar lower end is through permanent joint, core bar lower end cylindrical cover has crossover sub, crossover sub lower end cylindrical socket rotary nozzle, between core bar and permanent joint inwall, being provided with sleeve is connected on permanent joint inwall, core bar upper end is provided with boss, between boss lower surface and sleeve upper end, be provided with ball I, between crossover sub upper end and core bar outer wall, be provided with groove, in groove, be provided with ball II, on rotary nozzle sidewall, be arranged with two fins, on rotary nozzle sidewall, along Inner chamber sidewall tangent line, be arranged with the plug-flow spout of eccentric wire and between two fins, rotary nozzle lower end is provided with water fog applicator.
7. flue gas coal gas dust removal of a kind of converter according to claim 1 and deep purifying system, it is characterized in that, the spraying of described nozzle rotation mixed flow producer is supplied water according to the concrete water quality such as its recirculated water basicity, pH value, consumption, adopt suitable dosing technique, adjust pH value, add Scale inhibitors allotment to form.
8. flue gas coal gas dust removal of a kind of converter according to claim 1 and deep purifying system, it is characterized in that, described nozzle rotation mixed flow producer is heavily cut or polish jade with an emery wheel online conveying good antiscale property mixed liquid by the negative pressure of flue gas thrust-augmenting nozzle to aditus laryngis and the liftable of adjustable circumferential weld weight washer, the loose effect of huge legendary turtle splitting or integrating by the Scale inhibitors fouling that effectively the adjustable circumferential weld weight washer aditus laryngis of prevention and liftable are heavily cut or polish jade with an emery wheel occurs, thereby promotes and stablize smart dedusting, the cooling usefulness of adjustable annular gap scrubber to flue gas.
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| CN109837108B (en) * | 2019-03-27 | 2023-10-27 | 中冶南方工程技术有限公司 | Nested circular seam cleaning device and gas cleaning system |
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