CN104415628A - Wet efficient dehumidification dedusting apparatus for dust-containing steam flow flue gas - Google Patents

Wet efficient dehumidification dedusting apparatus for dust-containing steam flow flue gas Download PDF

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Publication number
CN104415628A
CN104415628A CN201310361175.0A CN201310361175A CN104415628A CN 104415628 A CN104415628 A CN 104415628A CN 201310361175 A CN201310361175 A CN 201310361175A CN 104415628 A CN104415628 A CN 104415628A
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China
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wet
dust
flue gas
spiral board
dehydration
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CN201310361175.0A
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CN104415628B (en
Inventor
陈振华
管序荣
孔德明
段同意
王有龙
胡可庆
李友怀
孙庭宇
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JIANGSU BOJI SPRAYING SYSTEMS HOLDING CO., LTD.
SHANGHAI BAOSTEEL ENERGY-SAVING ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD.
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BOJI SPRAY SYSTEM Co Ltd JIANGSU PROV
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D47/00Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/06Spray cleaning

Abstract

The present invention relates to a wet efficient dehumidification dedusting apparatus for dust-containing steam flow flue gas. The wet efficient dehumidification dedusting apparatus comprises a washing tower and a downstream flue channel, wherein the upper end of the washing tower and the upper end of the downstream flue channel are connected to form a channel, the lower end of the washing tower is provided with a flue inlet pipeline, the lower end of the downstream flue channel is provided with a flue outlet pipeline, a mist condensation capturing area, a spraying washing area and a dewatering dehumidification demisting area are sequentially arranged inside the washing tower above the flue inlet channel from bottom to top, a jetting interception layer is arranged between the mist condensation capturing area and the spraying washing area, a plant grid is arranged between the spraying washing area and the dewatering dehumidification demisting area, a first-stage enhanced cyclone multiple baffle dewatering dehumidification demisting device is arranged in the dewatering dehumidification demisting area, a set of fine liquid mist spraying guns are arranged below the first-stage enhanced cyclone multiple baffle dewatering dehumidification demisting device, and a second-stage enhanced cyclone multiple baffle dewatering dehumidification demisting device is arranged in the downstream flue channel. The dust-containing steam flow flue gas wet efficient dehumidification dedusting apparatus of the present invention has characteristics of compact layout, small occupation area, high dehumidification dedusting efficiency of the dust-containing steam flow flue gas, and energy consumption saving.

Description

Dust-laden vapor stream flue gas Wet-type high-efficient wet down dust arrester
Technical field
The present invention relates to a kind of dust arrester, particularly relate to a kind of dust-laden vapor stream flue gas Wet-type high-efficient wet down dust arrester for prevention and control of air pollution, belong to flue-gas dust-removing and desulfurization purifier technical field, also may be used for coal gas cooling wet down system.
Background technology
Steel and iron industry is the basic industry of modern economic construction, modern national defense, is also resource, major power consumer, and produce a large amount of byproducts and pollutant in process of production, energy-saving and emission-reduction task is urgent and heavy simultaneously.In Air Pollution Control, on February 27th, 2013, country determines that the industry such as iron and steel, cement all will start to perform the special emission limit of atmosphere pollution at Different periods.The improvement of strengthening respirable dust, particularly airborne fine particulate matter (PM2.5).Dust-laden vapor stream flue gas is the more disposal of pollutants flue gas of iron and steel metallurgical industry, slag processing and utilization is that dust-laden vapor stream flue gas typically produces source, in Slag treatment process, high-temperature slag is will be produced a large amount of superheated steams by during quick shrend, and steam airborne dust diffusion of carrying under one's arms is inevitable.Its main component is metal oxide particle, steam, pollutes regional environment.
Usually, cloth bag, sintered plate and electric cleaner are all the high-effective dust-removing technology of current mature and reliable, be applied to the dust-laden vapor stream flue-gas dust removal and purification that Slag treatment process produces, the discharge index of 50mg/Nm3 can be reached, but shortcoming is also obvious: not only investment and operating cost high, take up an area large, and construction time the cycle long, the most important is that this tail gas water capacity is up to 13 ~ 24%, the dust carried under one's arms is the superfine powder of slag, character and concrete similar, there is the hydraulicity and the solidifying property of glue (knot), cloth bag or sintered plate may easily harden, cause deashing difficulty.
According to this type of engineering practice in the past with detect data: be less than 10 μm of dust sizes in the dust-laden vapor stream flue gas that slag processing produces and account for percentage by volume and be about 32-44%.Percentage by volume shared by pellet is higher, and trapping difficulty is large, simultaneously in Slag treatment device operation process, because the slag (composition, temperature) of slag differs, so the fluctuation of tail gas dust concentration, exhaust gas volumn is larger.
Wet dust removal scheme, technique is simple, investment and operating cost low, easily implement, maximizing the benefits object can be reached.Even if but the low energy Wet-type spray purifying column of optimal design is used for gas cleaning dedusting usually, owing to adopting usual wet dust removal structure, it is only 60%-72% to the classification efficiency that particle diameter is 0--5 μm of fine particle, 80%-90% is only to the classification efficiency of 5-10 μm of respirable dusts, can lower than 90% to the total efficiency of dust collection of dust-laden vapor stream flue gas sucking the slag processing generation that shared by particle, percentage by volume is higher.Can not stablize and reach the special emission limit requirement of atmosphere pollution.
In recent years, the dust-laden vapor stream flue gas that more iron and steel enterprise adopts flue spray-on process process slag processing process to produce, but smoke catching weak effect, be separated without reliable aqueous vapor again, formation cloud is carried under one's arms, and is spread by aiutage, causes pellet on a large scale to exceed standard.Simultaneously because flue spray for dust suppression method principle utilizes the density of inner flue gas of the stove and atmospheric density poor, producing draft by aiutage, making the dust-laden vapor stream flue gas of flowing in flue by obtaining during spray washing district washing and wet down is lowered the temperature.But the grit in dust-laden vapor stream flue gas and the inertial collision between drop, interception and cohesion weak.And due to flue-gas temperature in aiutage low, moisture content is high, and dampness increases, and hot lifting draft weakens, smoke evacuation ability, occurs a large amount of cigarette that overflows before Slag treatment equipment, trapping weak effect.New [[the national prevention and control of air pollution action plan [planning]]] of formulating being about to of country is implemented, and the tighter requirement that the special emission limit of atmosphere pollution requires, makes steel and iron industry face environmental protection ' " end-of-term examination ".The wet dust removal gas purification techniques of the flue gas characteristics such as more high performance applicable dust-laden vapor stream is provided to equip the urgent task having become pollution emission reduction for controlling the operations such as golden slag processing.
Summary of the invention
For above-mentioned defect, the object of the present invention is to provide a kind of dust-laden vapor stream flue gas Wet-type high-efficient wet down dust arrester that can improve dust-laden vapor stream flue gas wet down efficiency of dust collection.
The technical solution adopted in the present invention is for this reason: comprise scrubbing tower and down pass, described scrubbing tower upper end and down pass upper end are connected to form passage, described scrubbing tower lower end is provided with smoke-intake pipe road, described down pass lower end is provided with smoke pipeline, mist solidifying trapping district is provided with above smoke-intake pipe road from bottom to top successively in scrubbing tower, spray washing district and dehydration wet down are except fog-zone, injection intercept layer is provided with between mist solidifying trapping district and spray washing district, spray washing district and dehydration wet down are provided with planar grille except between fog-zone, be provided with two stage enhancement type spiral boards in down pass and keep off dehydration wet down demister again.
Described injection intercept layer is made up of single or multiple lift rod gate layer, the excellent grid cross section cloth column direction of adjacent rod gate layer of single or multiple lift rod gate layer is identical and be staggered in alternate, the excellent grid cross sectional shape of every layer of excellent gate layer is identical, cloth column direction is identical, rod grid spacing is equal, and described excellent grid are rearranged by solid pole or hollow circular-tube.
Described injection intercept layer and solidifying the trapping between district of mist are provided with one group of two-fluid spray gun and one group thin liquid spray painting rifle, described two-fluid spray gun to be positioned at above thin liquid spray painting rifle and to arrange in downstream direction, and described thin liquid spray painting rifle is arranged in inverse air-flow and is alternate being staggered with two-fluid spray gun.
The spraying layer of more than three floor or three floor is provided with from bottom to top in described spray washing district, described spraying layer is made up of cleaning solution distribution endless tube, spray gun and the nozzle with connecting branch, the nozzle of the spraying layer of most top layer is unidirectional nozzle, direction is downward, the nozzle of other spraying layers is two-way or single-direction and dual-direction mixing nozzle, and the nozzle of adjacent spraying layer is alternate being staggered.
Described dehydration wet down keeps off dehydration wet down demister again except being provided with first order enhancement mode spiral board in fog-zone, described first order enhancement mode spiral board keeps off dehydration wet down demister again and is composited by export-oriented spiral board and the multiple baffle group of streamlined concentric circles, the multiple baffle group of streamlined concentric circles is arranged on above export-oriented spiral board, be provided with one group thin liquid spray painting rifle before export-oriented spiral board, described thin liquid spray painting rifle direction upwards.
The described mat woven of fine bamboo strips two stage enhancement type spiral board keeps off dehydration wet down demister again and is composited by export-oriented spiral board and the multiple baffle group of streamlined concentric circles, and the multiple baffle group of streamlined concentric circles is arranged on below export-oriented spiral board.
The multiple baffle group of described streamlined concentric circles is made up of some concentric sleeves, and between each sleeve, spacing radially increases progressively successively, and each sleeve height radially successively decreases successively, and one end of each sleeve is same level.
Described smoke-intake pipe road is horizontal by 12-16 °, and the Way in smoke-intake pipe road down.
Advantage of the present invention is:
1, dust-laden vapor stream flue gas ash removal efficiency of the present invention is high.Being less than 10 μm of dust sizes in the dust-laden vapor stream flue gas that slag processing produces, to account for percentage by volume be 44%.The present invention is in mist solidifying trapping appropriate location, district, the droplet group of different fine grain or the droplet group of absorbent is injected in tower, being formed highdensity take suspended particulate as the mist group mist field of core, flow through injection intercept layer---indication rod gate layer of the present invention, condensed by dynamic high-efficiency, interception, simultaneously, secondary dehydration wet down demister adopts enhancement mode spiral board to keep off dehydration wet down demister again, efficiently to dry demist, total efficiency of dust collection >=98% of slag processing dust-laden vapor stream flue gas Wet-type high-efficient wet down dust arrester, compare and be generally used for the total efficiency of dust collection raising 12% of this type of dust-laden vapor stream flue gas ash removal spray column.
2, the present invention can save energy consumption.Owing to improve the dedusting classification efficiency to relatively fine particle thing in the mist section of coagulating, thus can to change in spray washing section be usually the way that trapping fine particle adopts large liquid-gas ratio transition to wash at this section, be issued to higher udst separation efficiency at lower liquid-gas ratio, reduce the internal circulating load of circulation fluid.Thus reduce total power consumption of system for wet purification.Compare usual Wet-type spray scrubbing tower cleaning system for dedusting, under equal conditions, liquid-gas ratio can reduce 33%, just can reach desirable efficiency of dust collection.
Due to the minimizing of internal circulating load, exhaust gas volumn is constant, and liquid-gas ratio reduces, and the corresponding reduction of spray scrubber dampness, also just reduces fan energy consumption.
Compared with usual Wet-type spray scrubbing tower, when total spray liquid measure is constant, again owing to reducing the liquid-gas ratio of spray washing layer, for increasing a section low level lift spray amount, then total power consumption of detergent circulator can reduce, account for 80% of total amount of liquor by spray washing layer spray liquid measure, then power consumption declines 5%.
Like this due to minimizing, the reduction of solution feed pump total (pumping) head of cleaning solution internal circulating load, total power consumption about reduces by 38%.
The present invention adopts first order enhancement mode spiral board to keep off dehydration wet down demister again, and this dehydration wet down demister is composited by one group of export-oriented spiral board and the multiple baffle group of streamlined concentric circles.Be used for being separated the fine droplet in rising flue gas.When wet flue gas does spiral motion through export-oriented spiral board, the mechanical water drop part that wet flue gas carries forms liquid film because effect of inertia is trapped on spiral-plate leaf, liquid stream, liquid stream along plate face short distance centrifugal become wall, complete gas-liquid separation, eddy flow energy is obtained when wet flue gas leaves spiral board, the water droplet may carried secretly in eddy flow flue gas centrifugal become wall, complete gas-liquid separation further, but along with wet flue gas is away from plate face, suffered by drop centrifugal become wall active force weaken rapidly, the downstream of export-oriented spiral board is arranged on suitably apart from cross section by the multiple baffle group of the streamlined concentric circles of eddy flow Streamline Design, the eddy flow energy that direct undertaking and utilization weaken gradually, the small droplet remained in wet flue gas closely collides with multilayer concentric plectane face and forms wall and wanders and be separated from flue gas by the wall that again becomes on spiral board.Thus improving total dehydration wet down demisting efficiency, in this process, the multiple baffle group of streamlined concentric circles takes full advantage of eddy flow energy, and the resistance itself consumed is damaged minimum, realizes low energy consumption dehydration wet down demister.
3, the present invention adopts and to arrange second level enhancement mode spiral board outside tower and keep off dehydration wet down demister again, and different range value is got in the design of secondary dehydration wet down demister gas perforation kinetic energy factor.Effective particle diameter width improving removal spray film and drip, thus reach the demist of high-efficiency dehydration wet down.Smoke evacuation droplet content≤75mg/Nm 3.
4, the present invention is more suitable for the purification process of dust-laden vapor stream flue gas characteristic.The dust-laden vapor stream smoke moisture that slag processing produces is large, water capacity up to: 13%--24%, the dust carried under one's arms is the superfine powder of slag, has the hydraulicity and adhesion.The drop be detained due to dehydrated wet down demister contains solid, and cause the fouling of dehydration wet down demister bonding, flow resistance increases.
The present invention enters before first order enhancement mode spiral board keeps off dehydration wet down demister again at flue gas and arranges one group of fine water fog spraying gun, spray gun sprays the water mists of certain pressure to dehydration wet down demister surface, water membrane is formed online on its surface, overcome in usual spiral board or the wet cigarette of deflection plate dehydration wet down demister for a long time after purifying containing the hydraulicity and the solidifying property of glue (knot) to run and there is the fouling that easily bonds, cause the drawback that flow resistance increases.There is stronger anti stick, scale-preventing performance, enhance simultaneously and the cohesion of the water smoke drop escaping to overflow is trapped.Moreover secondary rinses frequency and each washing time, washing water quantity all reduce, and saves flushing pump power consumption.Compare usual superficial linear velocity in a column fluctuation range and all can obtain stable dehydration wet down demisting efficiency in 10% scope.Compare usual spiral board or deflection plate dehydration wet down demister dehydration rate raising 6%.
5, all spray guns of apparatus of the present invention are all furnished with floor installation on outer tower wall, single spray gun barral of a gun are equipped with one or several nozzle, and operating personnel can implement overall examine and replace or dismounting to spray gun outside tower.Realize not shutting down dismounting maintenance online, enter dismounting maintenance in tower without the need to personnel, improve the working condition of operation maintainer, swift to operate, safe, reliable.
6, the present invention is due to the integrated equipment for the treatment of apparatus, compact in design, and it is few that floor space compares usual spray column.Owing to adopting reducing tower, spraying spray section superficial linear velocity in a column is higher, and tower diameter is less, mat woven of fine bamboo strips one-level dehydration wet down demister section amplifies, external dehydration wet down demister is installed on down pass, and under identical process air quantity condition, capital cost, equipment investment expense all have technology lower than oneself.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure, 1 is scrubbing tower, 2 is excellent gate layer, 3 is smoke-intake pipe roads, 4 is thin liquid spray painting rifles, 5 is two-fluid spray guns, 6 is spraying layers, 7 is excellent gate layer flushing water spray gun assemblies, 8 is spraying layer feed pipe interfaces, 9 is flushing liquor interfaces, 10 is that thin liquid spray painting rifle group is for liquid interface, 11 is that two-fluid spray gun group is for liquid interface, 12 is that two-fluid spray gun group is for calming the anger interface, 13 is planar grilles, 14 is export-oriented spiral boards, 15 is the multiple baffle group of streamlined concentric circles, 16 is down pass, 17 is smoke pipelines, 18 is blowdown skewed slots, 19 is blow-off lines, 20 is effluent cycle sedimentation basins, 21 is effluent outfalls, 22 is water seals, I is mist solidifying trapping district, II is spray washing district, III is that dehydration wet down is except fog-zone.
Detailed description of the invention
Embodiment 1
Slag processing dust-laden vapor stream flue gas Wet-type high-efficient wet down dust arrester is the way of contact of wet type multilayer gas-liquid counter current, sectional spraying in scrubbing tower 1, spray, the demist of dehydration wet down, high-efficiency purification process, in Xian Di tower 1, the solidifying trapping of dynamic formation mist from bottom to top district I, spray washing district II, dehydration wet down are except fog-zone III, spray intercept layer and are made up of one group of single or multiple lift rod gate layer 2.
The present invention realizes the udst separation of slag processing dust-laden vapor stream flue gas Wet-type high-efficient wet down in the following manner.
Under the negative-pressure ward of blower fan, from the dust-laden vapor stream flue gas that Slag treatment device is drawn, be oblique scrubbing tower 1 14 ° of angles with plane from smoke-intake pipe road 3, first with spray under the cleaning solution let out contact wash, lower the temperature, wet down.
The up certain distance of flue gas, to spraying between intercept layer, appropriate section arranges one group thin liquid spray painting rifle 4 in inverse air-flow in smoke inlet cross section, simultaneously this section with thin liquid spray painting rifle 4 jet angle be upwards alternate, be staggered, favorable current arranges one group of two-fluid spray gun 5, evenly spray the droplet group of different fine grain or the droplet group of absorbent to this section, flue gas mixes with it.
When two-fluid spray gun 5 normally works, need control operation condition, supply the compressed gas (air or nitrogen, steam) of certain pressure and the water (or absorbing liquid) of certain pressure simultaneously.The inside of two-fluid spray gun 5 nozzle, the solution of compressed gas and water or absorbent, through the strike of several times, produces very tiny particle.Lance outlet liquid mist stream flow velocity reaches 25m/s-37m/s, and when nozzle normally works, the aero operating pressure at nozzle entrance place is 0.3-0.5 Mpa under normal circumstances, and the operating pressure of water or absorbent is 0.3-0.65 Mpa.
Carry the single or multiple lift rod gate layer 2 of mixed flue gas upwards by arranging of the spray particle group of different mist droplet particle size, circulating face accounts for basal area 38--55%.
Rod gate layer 2 is upwards spray washing district II, arranges Multi-layer sprinkling layer 6, above excellent gate layer 2, arranges one group of rod gate layer flushing water spray gun assembly 7.
All spray guns are all furnished with floor installation on outer tower wall, and operating personnel can implement integral replacing dismounting to spray gun outside tower.
Spray liquid adopts unit style applicator designs, and spraying layer 6 cleaning solution and mist eliminator flushing fresh water (FW) adopt electric hydraulic valve group independently to control respectively, to select economic operation model, flushing process is completed automatically by programme-control.
Spraying layer 6 is by the composition such as cleaning solution distribution endless tube and spray gun, nozzle, metal hose etc. of band connecting branch.
The nozzle direction of bottom spraying layer 6 is two-way, and the nozzle direction of top layer spraying layer 6 is downward.Nozzle is evenly arranged on the cross section of ascending zone, and its spray coverage rate is greater than 200%.Spray liquid adopts unit style applicator designs, spraying layer 6 is accessed by spraying layer feed pipe interface 8, one-level two stage enhancement type spiral board keeps off dehydration wet down demister again and is accessed by flushing liquor interface 9, and thin liquid spray painting rifle 4 is accessed for liquid interface 10 by thin liquid spray painting rifle rent, two-fluid spray gun 5 is accessed for liquid interface 11 by two-fluid spray gun group, two-fluid spray gun 5 is accessed for interface 12 of calming the anger by two-fluid spray gun group.Spraying layer and mist eliminator flushing fresh water (FW) adopt electric hydraulic valve group independently to control respectively, to select economic operation model.
Spraying layer is upwards for removing fog-zone III for dehydration wet down.
Spray washing district II and dehydration wet down arrange plane barrier 13 except between the III of fog-zone, adopt the steel band of proper width to be made.
Dehydration wet down keeps off dehydration wet down demister again except being provided with first order enhancement mode spiral board in the III of fog-zone, described first order enhancement mode spiral board keeps off dehydration wet down demister again and is composited by export-oriented spiral board 14 and the multiple baffle group 15 of streamlined concentric circles, the multiple baffle group 15 of streamlined concentric circles is arranged on above export-oriented spiral board 14, be provided with one group thin liquid spray painting rifle 4 below export-oriented spiral board 14, described thin liquid spray painting rifle 4 direction upwards.
Flue gas flow direction down pass 16 after dehydration wet down demister is kept off again through first order enhancement mode spiral board, down pass 16 arranges second level enhancement mode spiral board and keeps off dehydration wet down demister again, second level enhancement mode spiral board keeps off dehydration wet down demister again and is composited by export-oriented spiral board 14 and the multiple baffle group 15 of streamlined concentric circles, and the multiple baffle group 15 of streamlined concentric circles is arranged on below export-oriented spiral board 14.
The present invention adopts first order enhancement mode spiral board to keep off dehydration wet down demister and second level enhancement mode spiral board again and keeps off dehydration wet down demister again and all introduce flushing liquor, and flushing process and cycle are completed automatically by programme-control.Enter before first order enhancement mode spiral board keeps off dehydration wet down demister again at flue gas simultaneously and one group thin liquid spray painting rifle 4 is set, thin liquid spray painting rifle 4 keeps off to the first order enhancement mode spiral board water mists that certain pressure is sprayed on dehydration wet down demister surface again, form water membrane online on its surface, effectively prevent the first order enhancement mode spiral board from keeping off dehydration wet down demister surface bonding again.Enhance simultaneously and the cohesion of the water smoke drop escaping to overflow is trapped, effectively improve dehydration wet down demisting efficiency.
Two after efficient demist its outlet water droplet carrying amount≤75mg/Nm3, guarantee that the air-flow entering blower fan is clean, neat stress discharges through smoke pipeline 17.
The muddy water be captured enters scrubbing tower 1 bottom blow-down skewed slot 18, rushes grey structure drain into effluent cycle sedimentation basin 20 after collecting through blow-off line 19 water seal; The parting liquid that two stage enhancement type spiral boards keep off dehydration wet down demister again enters water seal 22 through effluent outfall 21, and water seal 22 upper reaches sewage drains into effluent cycle sedimentation basin 20.
In effluent cycle sedimentation basin 20, complete cooling, clarification, supernatant enters circulatory pool clear water zone, is recycled by circulating pump supply arrangement.
Dedusting plaster is concentrated in effluent cycle sedimentation basin 20, by pump timing extraction under dreg slurry, delivers to drying bed process.
Embodiment 2
Iron and steel corporation Slag treatment comprehensive reformation project, adopts drum process slag treatment process, and the dust-laden vapor stream humidity of flue gas of drawing from Slag treatment device is high: 13%--15%, and the dust carried under one's arms is the superfine powder of slag, has the hydraulicity and glutinous (knot) property.From dust-laden domain size distribution: shared percentage by volume/%: particle diameter > 10 μm account for 56%, particle diameter 2--10 μm accounts for 32% all the other < 2 μm and accounts for 12%.Select slag processing dust-laden vapor stream flue gas wet spray spraying dedusting device.
Wet-type spray cleaner, before being located at air-introduced machine, after purification, gas is disposed to air through blower fan, aiutage.
The relevant operational factor of the present embodiment is as follows
Smoke treatment amount 20 × 10 4m 3/ h
Input gas temperature 80 ~ 100 DEG C
Dust inlet initial concentration 1000mg/Nm 3
Void tower velocity of flue gas 4 (m/s)
Dehydration wet down is except fog-zone velocity of flue gas 3.4 (m/s)
Two-fluid spray gun one group
Thin two groups, liquid spray painting rifle
Under the negative-pressure ward of blower fan, from the dust-laden vapor stream flue gas that Slag treatment device is drawn, be oblique scrubbing tower 1 14 ° of angles with plane from smoke-intake pipe road 3, first with spray under the absorbing liquid let out contact and wash, lower the temperature, be humidified.
The up certain distance of flue gas, to spraying between intercept layer, appropriate section arranges one group thin liquid spray painting rifle 4 in inverse air-flow in smoke inlet cross section, simultaneously this section with thin liquid spray painting rifle 4 jet angle be upwards alternate, be staggered, favorable current arranges one group of two-fluid spray gun 5, evenly spray the droplet group of different fine grain or the droplet group of absorbent to this section, flue gas mixes with it.
When two-fluid spray gun 5 normally works, need control operation condition, supply the compressed gas (air or nitrogen, steam) of certain pressure and the water (or absorbing liquid) of certain pressure simultaneously.The inside of two-fluid spray gun 5 nozzle, the solution of compressed gas and water or absorbent, through the strike of several times, produces very tiny particle.Lance outlet liquid mist stream flow velocity reaches 25m/s-37m/s, and when nozzle normally works, the aero operating pressure at nozzle entrance place is 0.3-0.5 Mpa under normal circumstances, and the operating pressure of water or absorbent is 0.3-0.65 Mpa.
Carry the single or multiple lift rod gate layer 2 of mixed flue gas upwards by arranging of the spray particle group of different mist droplet particle size, circulating face accounts for basal area 38--55%.
Rod gate layer 2 is upwards spray washing district II, arranges Multi-layer sprinkling layer 6, above excellent gate layer 2, arranges one group of rod gate layer flushing water spray gun assembly 7.
All spray guns are all furnished with floor installation on outer tower wall, and operating personnel can implement integral replacing dismounting to spray gun outside tower.
Spray liquid adopts unit style applicator designs, and spraying layer 6 cleaning solution and mist eliminator flushing fresh water (FW) adopt electric hydraulic valve group independently to control respectively, to select economic operation model, flushing process is completed automatically by programme-control.
Spraying layer 6 is by the composition such as cleaning solution distribution endless tube and spray gun, nozzle, metal hose etc. of band connecting branch.
The nozzle direction of bottom spraying layer 6 is two-way, and the nozzle direction of top layer spraying layer 6 is downward.Nozzle is evenly arranged on the cross section of ascending zone, and its spray coverage rate is greater than 200%.Spray liquid adopts unit style applicator designs, spraying layer 6 is accessed by spraying layer feed pipe interface 8, one-level two stage enhancement type spiral board keeps off dehydration wet down demister again and is accessed by flushing liquor interface 9, and thin liquid spray painting rifle 4 is accessed for liquid interface 10 by thin liquid spray painting rifle rent, two-fluid spray gun 5 is accessed for liquid interface 11 by two-fluid spray gun group, two-fluid spray gun 5 is accessed for interface 12 of calming the anger by two-fluid spray gun group.Spraying layer and mist eliminator flushing fresh water (FW) adopt electric hydraulic valve group independently to control respectively, to select economic operation model.
Spraying layer is upwards for removing fog-zone III for dehydration wet down.
Spray washing district II and dehydration wet down arrange plane barrier 13 except between the III of fog-zone, adopt the steel band of proper width to be made.
Dehydration wet down keeps off dehydration wet down demister again except being provided with first order enhancement mode spiral board in the III of fog-zone, described first order enhancement mode spiral board keeps off dehydration wet down demister again and is composited by export-oriented spiral board 14 and the multiple baffle group 15 of streamlined concentric circles, the multiple baffle group 15 of streamlined concentric circles is arranged on above export-oriented spiral board 14, export-oriented spiral board 14 front lower place is provided with one group thin liquid spray painting rifle 4, and described thin liquid spray painting rifle 4 direction upwards.
Flue gas flow direction down pass 16 after dehydration wet down demister is kept off again through first order enhancement mode spiral board, down pass 16 arranges the mat woven of fine bamboo strips two stage enhancement type spiral board and keeps off dehydration wet down demister again, second level enhancement mode spiral board keeps off dehydration wet down demister again and is composited by export-oriented spiral board 14 and the multiple baffle group 15 of streamlined concentric circles, and the multiple baffle group 15 of streamlined concentric circles is arranged on below export-oriented spiral board 14.
The present invention adopts first order enhancement mode spiral board to keep off dehydration wet down demister and second level enhancement mode spiral board again and keeps off dehydration wet down demister again and all introduce flushing liquor, and flushing process and cycle are completed automatically by programme-control.Enter before first order enhancement mode spiral board keeps off dehydration wet down demister again at flue gas simultaneously and one group thin liquid spray painting rifle 4 is set, thin liquid spray painting rifle 4 keeps off to the first order enhancement mode spiral board water mists that certain pressure is sprayed on dehydration wet down demister surface again, form water membrane online on its surface, effectively prevent the first order enhancement mode spiral board from keeping off dehydration wet down demister surface bonding again.
Two after efficient demist its outlet water droplet carrying amount≤75mg/Nm3, guarantee that the air-flow entering blower fan is clean, neat stress discharges through smoke pipeline 17.
The muddy water be captured enters scrubbing tower 1 bottom blow-down skewed slot 18, rushes grey structure drain into effluent cycle sedimentation basin 20 after collecting through blow-off line 19 water seal; The parting liquid that two stage enhancement type spiral boards keep off dehydration wet down demister again enters water seal 22 through effluent outfall 21, and water seal 22 upper reaches sewage drains into effluent cycle sedimentation basin 20.
In effluent cycle sedimentation basin 20, complete cooling, clarification, supernatant enters circulatory pool clear water zone, is recycled by circulating pump supply arrangement.
Dedusting plaster is concentrated in effluent cycle sedimentation basin 20, by pump timing extraction under dreg slurry, delivers to drying bed process.
After dedusting and purifying device process, efficiency of dust collection >=98%, spraying dust removal tower drag overall Pa≤1400Pa, exit gas temperature 67 DEG C.Compare usual Wet-type spray scrubbing tower cleaning system liquid-gas ratio and reduce 22%.Equipment and blower fan power station, aiutage etc. take up an area 120 square metres.
The present invention is due to the integrated equipment for the treatment of apparatus, and compact in design, comprises the floor space only 105m such as blower fan power station, aiutage 2, sewage enters the unified precipitation process of effluent cycle sedimentation basin 20, and easy to operate, all spray guns are removably and are installed on tower body, and aerosol spray gun, spray washing water fog spraying gun are all set to center-control and on-site manual control model.Under identical process air quantity condition, capital expenditure expense, equipment investment expense and operating cost all have technology lower than oneself, under equal conditions, liquid-gas ratio can reduce 33%, efficiency of dust collection >=98%, meets wet purification technology of new generation and the device of the new atmosphere pollution special emission limit requirement of country completely.Be widely used in the high temperature of the industries such as iron and steel, non-ferrous metal, cement building material, electric power, chemical industry, high humidity, viscosity large and containing the flue gas wet down udst separation of high resistivity dust, also may be used for coal gas cooling wet down system.

Claims (8)

1. dust-laden vapor stream flue gas Wet-type high-efficient wet down dust arrester, it is characterized in that, comprise scrubbing tower and down pass, described scrubbing tower upper end and down pass upper end are connected to form passage, described scrubbing tower lower end is provided with smoke-intake pipe road, described down pass lower end is provided with smoke pipeline, mist solidifying trapping district is provided with above smoke-intake pipe road from bottom to top successively in scrubbing tower, spray washing district and dehydration wet down are except fog-zone, injection intercept layer is provided with between mist solidifying trapping district and spray washing district, spray washing district and dehydration wet down are provided with planar grille except between fog-zone, dehydration wet down keeps off dehydration wet down demister again except establishing first order enhancement mode spiral board in fog-zone, first order enhancement mode spiral board keeps off again below dehydration wet down demister and is provided with one group thin liquid spray painting rifle, be provided with second level enhancement mode spiral board in down pass and keep off dehydration wet down demister again.
2. dust-laden vapor stream flue gas Wet-type high-efficient wet down dust arrester according to claim 1, it is characterized in that, described injection intercept layer is made up of single or multiple lift rod gate layer, the excellent grid cross section cloth column direction of adjacent rod gate layer of single or multiple lift rod gate layer is identical and be staggered in alternate, the excellent grid cross sectional shape of every layer of excellent gate layer is identical, cloth column direction is identical, and excellent grid spacing is equal, and described excellent grid are rearranged by solid pole or hollow circular-tube.
3. dust-laden vapor stream flue gas Wet-type high-efficient wet down dust arrester according to claim 1, it is characterized in that, described injection intercept layer and solidifying the trapping between district of mist are provided with one group of two-fluid spray gun and one group thin liquid spray painting rifle, described two-fluid spray gun to be positioned at above thin liquid spray painting rifle and to arrange in downstream direction, and described thin liquid spray painting rifle is arranged in inverse air-flow and is alternate being staggered with two-fluid spray gun.
4. dust-laden vapor stream flue gas Wet-type high-efficient wet down dust arrester according to claim 1, it is characterized in that, the spraying layer of more than three floor or three floor is provided with from bottom to top in described spray washing district, described spraying layer is made up of cleaning solution distribution endless tube, spray gun and the nozzle with connecting branch, the nozzle of the spraying layer of most top layer is unidirectional nozzle, direction is downward, and the nozzle of other spraying layers is two-way or single-direction and dual-direction mixing nozzle, and the nozzle of adjacent spraying layer is alternate being staggered.
5. dust-laden vapor stream flue gas Wet-type high-efficient wet down dust arrester according to claim 1, it is characterized in that, described dehydration wet down keeps off dehydration wet down demister again except being provided with first order enhancement mode spiral board in fog-zone, described first order enhancement mode spiral board keeps off dehydration wet down demister again and is composited by export-oriented spiral board and the multiple baffle group of streamlined concentric circles, the multiple baffle group of streamlined concentric circles is arranged on above export-oriented spiral board, be provided with one group thin liquid spray painting rifle below export-oriented spiral board, described thin liquid spray painting rifle direction upwards.
6. dust-laden vapor stream flue gas Wet-type high-efficient wet down dust arrester according to claim 1, it is characterized in that, described second level enhancement mode spiral board keeps off dehydration wet down demister again and is composited by export-oriented spiral board and the multiple baffle group of streamlined concentric circles, and the multiple baffle group of streamlined concentric circles is arranged on below export-oriented spiral board.
7. the dust-laden vapor stream flue gas Wet-type high-efficient wet down dust arrester according to claim 5 or 6, it is characterized in that, the multiple baffle group of described streamlined concentric circles is made up of some concentric sleeves, between each sleeve, spacing radially increases progressively successively, each sleeve height radially successively decreases successively, and one end of each sleeve is same level.
8. dust-laden vapor stream flue gas Wet-type high-efficient wet down dust arrester according to claim 1, it is characterized in that, described smoke-intake pipe road is horizontal by 12-16 °, and the Way in smoke-intake pipe road down.
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CN106244767A (en) * 2015-09-04 2016-12-21 江苏博际喷雾系统有限公司 A kind of flue gas adjustable circumferential weld washing dehydration of converter is except mist integrated tower
CN106906016A (en) * 2017-03-31 2017-06-30 山西都宝新能源发展研究院 A kind of energy-efficient pretreatment process method for the gas that generates electricity
CN109489434A (en) * 2018-11-09 2019-03-19 南京瑞泰水泥制造设备有限公司 A kind of fiery grading plant that disappears that gathers dust of cement produced with the dry method rotary kiln grate-cooler
CN110841444A (en) * 2019-11-19 2020-02-28 长春工业大学 Integrated device and process for simultaneously desulfurizing and denitrifying flue gas by liquid phase method

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CN1743054A (en) * 2005-07-13 2006-03-08 杭州理想科技有限公司 Super-thin spray cyclone double-way double-cycle dust-removing desulfurating apparatus
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CN106244767A (en) * 2015-09-04 2016-12-21 江苏博际喷雾系统有限公司 A kind of flue gas adjustable circumferential weld washing dehydration of converter is except mist integrated tower
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CN106906016A (en) * 2017-03-31 2017-06-30 山西都宝新能源发展研究院 A kind of energy-efficient pretreatment process method for the gas that generates electricity
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CN110841444A (en) * 2019-11-19 2020-02-28 长春工业大学 Integrated device and process for simultaneously desulfurizing and denitrifying flue gas by liquid phase method

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