CN104740992A - Flue gas deep desulfurization and dust removal device and method by use of carbide slag-gypsum method - Google Patents
Flue gas deep desulfurization and dust removal device and method by use of carbide slag-gypsum method Download PDFInfo
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- CN104740992A CN104740992A CN201510126119.8A CN201510126119A CN104740992A CN 104740992 A CN104740992 A CN 104740992A CN 201510126119 A CN201510126119 A CN 201510126119A CN 104740992 A CN104740992 A CN 104740992A
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Abstract
The invention discloses a flue gas deep desulfurization and dust removal device and method by use of a carbide slag-gypsum method. The flue gas deep desulfurization and dust removal device comprises a desulfurizing tower, a wet type electric precipitation demister, a sedimentation tank, a dehydration system and a grout preparation system, wherein the two-stage desulfurizing tower is connected with the wet type electric precipitation demister in series, and compared with a traditional double-tower double-circulation desulfurization process, the method has the desulphurization efficiency up to 99% and more, and the occupying space of the desulfurizing tower can be effectively reduced; carbide slag is used as a desulfurizing agent, a method of waste control by waste is utilized, the method is environmentally friendly and has the remarkable economic benefit; two-stage cyclone classification grouting is adopted, and grouts with different specifications can be prepared, while the absorption efficiency of the desulfurizing tower is ensured, a filling layer inside the desulfurizing tower can be prevented from blockage effectively; the wet type electric precipitation demister is combined to further improve the dedusting efficiency, and the device and the method can be used for achieving zero emission of dust such as PM2.5 particularly.
Description
Technical field
The invention belongs to flue gas desulfurization and dedusting field, being specifically related to a kind of take carbide slag as flue gas deep desulfuration dust arrester and the method for desulfurizing agent.
Background technology
Carbide slag slurry main active is Ca (OH)
2, carbide slag solution useful application in desulfuration absorbing tower, for absorbing the SO in flue gas
2, adopt carbide slag/lime-gypsum method desulfuration efficiency generally about 95%, a little more than conventional limestone-gypsum, therefore apply more and more extensive.But due to Ca (OH)
2be slightly soluble in water, a disadvantage of existence, exceed the easy occluding device pipeline of certain density carbide slag solution.
Such as, notification number is that the Chinese invention patent of CN 101642674 B discloses the pretreated wet fuel gas desulfurizing technology of a kind of carbide slag, using carbide slag slurry as desulfurizing agent, wet desulphurization process is carried out to flue gas, catalyst is added in carbide slag slurry, and blast air and carry out oxidation reaction, the carbide slag slurry after oxidation reaction is re-used as desulfurizing agent and carries out smoke-gas wet desulfurization process.Application publication number is that the Chinese invention patent document of CN 101816891 A discloses the pretreated ozonation and wet-method flue gas desulphurization process of a kind of carbide slag, using carbide slag as desulfurizing agent, wet desulphurization is carried out to flue gas, the gaseous mixture of ozone and oxygen is passed in calcium carbide scorification slag process, carry out oxidation reaction, the carbide slag slurry after oxidation carries out flue gas desulfurization as desulfurizing agent.Above two kinds of techniques are all adopt primary cycle absorption tower, and absorption efficiency is difficult to the requirement of satisfied current minimum discharge standard, and the carbide slag solution that concentration can not be adopted higher.
Publication number is that the Chinese invention patent document of CN 102921287A discloses a kind of double tower Two-way Cycle Wet Limestone Desulfurization device and method, and its device comprises gas cleaning part, absorbent supply section, slurries oxidizing and crystallizing part and gypsum slurries dewatering part; This patent utilizes lime stone to carry out desulfurization by double tower Two-way Cycle, and desulfuration efficiency is improved, but the flue gas of discharge exists the dust such as higher PM2.5, is difficult to ensure current environmental protection discharge standard.
Summary of the invention
The technical problem that the present invention solves is: the defect that desulfuration efficiency is not high and fume emission is not up to standard existed for existing acetylene sludge-gypsum process desulphurization, thering is provided a kind of take carbide slag as flue gas deep desulfuration dust arrester and the method for desulfurizing agent, effectively removes SO in flue gas
2, SO
3, PM2.5 etc., realize the object of deep purifying from flue gas desulfurization and dedusting two aspect.
The present invention adopts following technical scheme to realize: a kind of acetylene sludge-gypsum process flue gas deep desulfuration dust arrester, comprising:
Desulfurizing tower, described desulfurizing tower be by first flue 9 connect spray column and packed tower, wherein first grade desulfurizing tower 2 is spray column, and two-grade desulfurizing tower 13 is packed tower, and flue gas is sent into from the smoke inlet of first grade desulfurizing tower 2;
Wet-esp demister 29, is communicated with by the second flue 23 with the exhanst gas outlet of two-grade desulfurizing tower 13, and the wet electric spraying layer 26 of this dedusting demister inside is connected by wet electric circulating pump 31 pipeline with clean solution tank 32;
Sedimentation basin 20, is communicated with the two-grade desulfurizing slurry pool 15 bottom two-grade desulfurizing tower 13, and described sedimentation basin 20 supernatant liquor is communicated with clean solution tank 32, and described sedimentation basin 20 is communicated with the first grade desulfurizing slurry pool 8 bottom first grade desulfurizing tower 2 respectively with the bottom of clean solution tank 32;
Dewatering system, is connected by pipeline with bottom first grade desulfurizing slurry pool 8, is connected with oxidation air 7 in described first grade desulfurizing slurry pool 8, sends into dewatering system after the slurries be deposited at the bottom of pond are oxidized to gypsum slurries.
Further, described first grade desulfurizing tower 13 inside is provided with 2-5 layer spraying layer, and the spraying layer in this desulfurizing tower is connected by desulfuration recycle pump pipeline with the desulfurization slurry pond at the bottom of tower.
Further, described two-grade desulfurizing tower 13 inside is provided with 1-3 layer packing layer, form of bio-carrier adopts random packing or structured packing, and each packing layer correspondence is provided with one deck spraying layer, and the spraying layer in this desulfurizing tower is connected by desulfuration recycle pump pipeline with the desulfurization slurry pond at the bottom of tower.
Further, desulfur agitator is equipped with in described first grade desulfurizing slurry pool 8 and two-grade desulfurizing slurry pool 15.
Further, described dewatering system comprises dewatering cyclone 38 and vacuum belt filter 39, described dewatering cyclone 38 is communicated with bottom first grade desulfurizing slurry pool 8, wherein, the underflow opening of dewatering cyclone is connected with vacuum belt filter 39, top head piece is communicated to effluent treatment plant, the gypsum filter cake outward transport that vacuum belt filter is produced, filtrate recycle.
Acetylene sludge-gypsum process flue gas deep desulfuration dust arrester in the present invention, also comprises the serum producing system carrying carbide slag slurry to first grade desulfurizing slurry pool 8 and two-grade desulfurizing slurry pool 15.
Further, described serum producing system comprises carbide slag slurries liquid pool 33, deckered stock chest 37 and thin pulp pond 36; Described carbide slag slurries liquid pool 33 to be connected with pipeline two-stage cyclones by pump, wherein the top head piece of one-level cyclone 34 is communicated with second cyclone 35, the underflow opening of one-level cyclone 34 is communicated with deckered stock chest 37, the top head piece of second cyclone 35 is communicated with thin pulp pond 36, and the underflow opening of second cyclone 35 circulates with carbide slag slurries liquid pool 33 and is communicated with; Thin pulp pond 36 is communicated with two-grade desulfurizing slurry pool 15 by pump and pipeline; Deckered stock chest 37 is communicated with first grade desulfurizing slurry pool 8 by pump and pipeline.
Further, described sedimentation basin 20 epimere is provided with curb 18 and overfall 21; Described curb 18 one end is communicated with two-grade desulfurizing slurry pool 15, and the other end is communicated with the vertical conduit 19 in sedimentation basin, and described overfall 21 is communicated with clean solution tank 31.
The invention also discloses a kind of acetylene sludge-gypsum process flue gas deep desulfuration dust collection method, adopt above-mentioned deep desulfuration dust arrester, specifically comprise the steps:
Step 1: temperature is sent in first grade desulfurizing tower 2 at the former flue gas of 130-170 DEG C, and flue gas contacts with the carbide slag slurry A under the spraying layer circulated sprinkling of first grade desulfurizing tower inside, the Ca (OH) in carbide slag slurry A
2with SO in flue gas
2reaction generates calcium sulfite, blasts air, reacted calcium sulfite slurries forced oxidation is become gypsum slurries and is deposited in bottom first grade desulfurizing slurry pool 8 by the oxidation air 7 in first grade desulfurizing slurry pool 8;
Step 2: the flue gas after first grade desulfurizing tower 2 purifies enters two-grade desulfurizing tower 13 by flue, contacts, remaining SO in flue gas while flue gas enters the packing layer 12 in two-grade desulfurizing tower with the carbide slag slurry B under the spraying layer circulated sprinkling in two-grade desulfurizing tower
2further with the Ca (OH) in carbide slag slurry B
2reaction generates calcium sulfite, calcium sulfite slurries enter the layering of sedimentation basin 20 bottom precipitation by two-grade desulfurizing slurry pool 15, bottom solid content enters in first grade desulfurizing slurry pool 8 at the calcium sulfite serum recycle of 30-50%, same forced oxidation generates gypsum slurries, and the overflow of sedimentation basin 20 upper clear supernate enters in clean solution tank 32;
Step 3: the flue gas after two-grade desulfurizing tower 13 purifies enters wet-esp demister 29 by flue 23, flue gas is after the purification of two-step desulfurization tower, containing more water smoke and PM2.5, flue gas enters between the positive plate 28 of wet-esp demister 29 after disperseing, under the negative electrode awns line 27 corona effect of periphery, water smoke in flue gas and PM2.5 are by chargedization and movement adheres on positive plate 28, the water smoke be adsorbed on positive plate 28 and PM2.5 wash away and enter clean solution tank 32 by the spray liquid of the wet electric spraying layer 26 in wet-esp demister, the clean flue gas of removing water smoke and PM2.5 is discharged by the exhanst gas outlet of wet-esp demister, complete the desulfurization and dedusting discharge of flue gas, clear liquid in clean solution tank 32 flows in first grade desulfurizing slurry pool 8, keep the water balance of first grade desulfurizing slurry pool 8 inside.
Step 4: the gypsum slurries in first grade desulfurizing slurry pool 8 after forced oxidation is after dewatering cyclone 38 classification, concentration of slurry is sent into vacuum belt filter 39 in the bottom slurry of 40-55% dewater further, and the final gypsum filter cake forming moisture content and be less than 10%, dewatering cyclone 38 top stream concentration sends to Waste Water Treatment lower than the slurries of 4%.
Further, the carbide slag slurry A in described first grade desulfurizing slurry pool 8 and two-grade desulfurizing slurry pool 15 and carbide slag slurry B is provided by the serum producing system described in claim 6 or 7, and concrete steps are as follows:
Carbide slag solid adds in carbide slag slurries liquid pool 33 by artificial or machinery, fresh water (FW) dilution is configured to concentration at 15-25% carbide slag slurry, after one-level cyclone 34 classification, underflow enters deckered stock chest 37, and and a small amount of fresh water (FW) be mixedly configured into concentration at 20-30%, the pH value carbide slag slurry A between 5-6, through pump and Cemented filling to first grade desulfurizing tower slurry pool 8; One-level cyclone 34 pushes up stream slurries and enters second cyclone 35 classification further, second cyclone 35 bottom slurry telegram in reply rock ballast slurry pool 33, second cyclone 35 pushes up stream slurries and goes to thin pulp pond 36, fresh water (FW) is diluted to concentration at 2-6%, the pH value carbide slag slurry B between 7-8, by pump and Cemented filling to two-grade desulfurizing slurry pool 15.
The present invention adopts technique scheme to have following beneficial effect:
(1) take carbide slag as desulfurizing agent, the treatment of wastes with processes of wastes against one another, environment benefits and economic gains is remarkable.
(2) adopt two-step desulfurization tower and wet-esp demister cascaded structure, compared with traditional double tower double circulation desulphurization technique, desulfuration efficiency can reach more than 99%, significantly reduces taking up room of desulfurizing tower simultaneously.
(3) slurrying of two-stage cyclone classification is adopted, produce the slurries of different size respectively, particle diameter is larger, the more carbide slag slurry of impurity is used for one-level spray desulfurizing tower, particle is little, the carbide slag slurry that quality is high is used for secondary filler desulfurizing tower, while guarantee two-grade desulfurizing tower absorption efficiency, effectively avoids desulfurizing tower inner stuffing layer to block.
(4) wet-esp mist eliminator flushing water is the clear liquid after desulfurization slurry precipitation, and ion concentration is higher, is conducive to water smoke and dust charge electrification, causes efficiency of dust collection high further, especially PM2.5, almost can realize the dust zero discharges such as PM2.5.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of carbide slag of the present invention-gypsum flue gas deep desulfuration dust arrester.
Number in the figure illustrates:
1-first grade desulfurizing smoke inlet, 2-first grade desulfurizing tower, 3-first grade desulfurizing tower spraying layer
4-first grade desulfurizing exhanst gas outlet, 5-first grade desulfurizing circulating pump, 6-first grade desulfurizing agitator
7-oxidation air, 8-first grade desulfurizing slurry pool 9-the first flue
10-two-grade desulfurizing smoke inlet, 11-two-grade desulfurizing spraying layer, 12-packing layer
13-two-grade desulfurizing tower, 14-two-grade desulfurizing exhanst gas outlet, 15-two-grade desulfurizing slurry pool
16-two-grade desulfurizing agitator, 17-two-grade desulfurizing circulating pump, 18-curb
19-vertically conduit 20-sedimentation basin 21-overfall
22-serum outlet 23-the second flue, 24-wet electric smoke inlet
25-wet electric exhanst gas outlet 26-wet electric spraying layer 27-negative electrode awns line
28-positive plate, 29-wet-esp demister, 30-flue gas even distribution device
31-wet electric circulating pump 32-clean solution tank 33-carbide slag slurries liquid pool
34-one-level cyclone, 35-second cyclone, 36-thin pulp pond
37-deckered stock chest, 38-dewatering cyclone, 39-vacuum belt filter
Detailed description of the invention
As shown in Figure 1, a kind of acetylene sludge-gypsum process flue gas deep desulfuration dust arrester comprises, and specifically comprises first grade desulfurizing tower 2, two-grade desulfurizing tower 13, wet-esp demister 29, sedimentation basin 20, serum producing system and dewatering system.
Desulfurizing tower, described desulfurizing tower be by first flue 9 connect spray column and packed tower, wherein first grade desulfurizing tower 2 is spray column, and two-grade desulfurizing tower 13 is packed tower, and flue gas is sent into from the smoke inlet of first grade desulfurizing tower 2; Wet-esp demister 29, is communicated with by the second flue 23 with the exhanst gas outlet of two-grade desulfurizing tower 13, and the wet electric spraying layer 26 of this dedusting demister inside is connected by wet electric circulating pump 31 pipeline with clean solution tank 32; Sedimentation basin 20, is communicated with the two-grade desulfurizing slurry pool 15 bottom two-grade desulfurizing tower 13, and described sedimentation basin 20 supernatant liquor is communicated with clean solution tank 32, and described sedimentation basin 20 is communicated with the first grade desulfurizing slurry pool 8 bottom first grade desulfurizing tower 2 respectively with the bottom of clean solution tank 32; Dewatering system, is connected by pipeline with bottom first grade desulfurizing slurry pool 8, is connected with oxidation air 7 in described first grade desulfurizing slurry pool 8, sends into dewatering system after the slurries be deposited at the bottom of pond are oxidized to gypsum slurries.
The inner hypomere of first grade desulfurizing tower 2 has first grade desulfurizing slurry pool 8, and epimere has first grade desulfurizing spraying layer 3, and first grade desulfurizing exhanst gas outlet 4 is arranged at top, and middle part is provided with first grade desulfurizing smoke inlet 1; First grade desulfurizing spraying layer 3 is connected by first grade desulfurizing circulating pump 5 and pipeline with first grade desulfurizing slurry pool 8.Have oxidation air 7 and first grade desulfurizing agitator 6 in first grade desulfurizing slurry pool, first grade desulfurizing tower flue gas outlet 4 is connected with two-grade desulfurizing tower 13 by the first flue 9.First grade desulfurizing tower 13 inside is provided with 2-5 layer spraying layer.
The inner hypomere of two-grade desulfurizing tower 13 has two-grade desulfurizing slurry pool 15, and epimere has two-grade desulfurizing spraying layer 11 and packing layer 12, and two-grade desulfurizing spraying layer 11 is positioned at above packing layer 12; Two-grade desulfurizing smoke inlet 10 is arranged at top, and two-grade desulfurizing spraying layer 11 realizes being communicated with by two-grade desulfurizing circulating pump 17 and pipeline with two-grade desulfurizing slurry pool 15, is provided with two-grade desulfurizing agitator 16 in two-grade desulfurizing slurry pool 15.There is two-grade desulfurizing tower flue gas to export 14 between two-grade desulfurizing tower slurry pool 15 and lower floor's packing layer 12, be communicated with wet-esp demister 28 by the second flue 23.Two-grade desulfurizing tower 13 inside is provided with 1-3 layer packing layer, each packing layer correspondence is provided with one deck spraying layer, and filler can be random packing or structured packing, as cascade ring, Raschig rings etc. also can be perforated plate corrugated filler, metal hexagon grid, the structured packing of metal triangular type positive wave.
Two-grade desulfurizing tower slurry pool 15 is communicated with sedimentation basin 20, sedimentation basin 20 epimere have curb 18 and overfall 21, there is vertical slurry conduit 19 centre; Curb 18 is connected with two-grade desulfurizing slurry pool 15, and overfall 21 is connected with clean solution tank 31; Be provided with serum outlet 22 bottom sedimentation basin 20, serum outlet 22 is connected with first grade desulfurizing slurry pool 8.
Wet-esp demister 29 bottom is provided with clean solution tank 32, wet electric smoke inlet 24 and flue gas even distribution device 30, there are some vertically parallel positive plates 28 at middle part, negative electrode awns line 27 is had between positive plate 28, positive plate 28 and negative electrode awns line 27 top are provided with wet electric spraying layer 26, and wet electric spraying layer 26 and clean solution tank 32 are by wet electric circulating pump 31 and pipeline communication.Wet-esp demister 29 top is provided with wet electric exhanst gas outlet 25, and neat stress is discharged thus.Clean solution tank 32 is connected with first grade desulfurizing tower slurry pool 8.
First grade desulfurizing slurry pool 8 and two-grade desulfurizing tower slurry pool 15 provide carbide slag slurry by serum producing system, serum producing system comprises carbide slag slurries liquid pool 33, thin pulp pond 36, deckered stock chest 37, one-level cyclone 34 and second cyclone 35, carbide slag slurries liquid pool 33 is connected with one-level cyclone with pipeline by pump, one-level cyclone 34 pushes up head piece and is connected with second cyclone 35, one-level cyclone 34 underflow opening is connected with deckered stock chest 37, second cyclone 35 pushes up head piece and is connected with thin pulp pond 36, and underflow opening is connected with carbide slag slurries liquid pool 33.Thin pulp pond 36 is connected with two-grade desulfurizing slurry pool 15 by pump and pipeline, and deckered stock chest 37 is connected with first grade desulfurizing slurry pool 8 by pump and pipeline.
Whole desulfurizer all absorptions SO
2calcium sulfite slurries be pooled to first grade desulfurizing slurry pool, forced oxidation sends into dewatering system after becoming gypsum slurries, dewatering system comprises dewatering cyclone 38 and vacuum belt filter 39, dewatering cyclone 38 is communicated with first grade desulfurizing slurry pool 8, dewatering cyclone 38 underflow opening is connected with plaster splint filter 39, and top head piece removes effluent treatment plant.The gypsum outward transport that vacuum belt filter 39 produces, filtrate recycle.
Apply the acetylene sludge-gypsum process flue gas deep desulfuration dust collection method of above-mentioned acetylene sludge-gypsum process flue gas deep desulfuration dust arrester, its step is as follows:
Step 1: temperature is sent in first grade desulfurizing tower 2 at the former flue gas of 130-170 DEG C, and flue gas contacts with the carbide slag slurry A under the spraying layer circulated sprinkling of first grade desulfurizing tower inside, the Ca (OH) in carbide slag slurry A
2with SO in flue gas
2reaction generates calcium sulfite, blasts air, reacted calcium sulfite slurries forced oxidation is become gypsum slurries and is deposited in bottom first grade desulfurizing slurry pool 8 by the oxidation air 7 in first grade desulfurizing slurry pool 8;
Step 2: the flue gas after first grade desulfurizing tower 2 purifies enters two-grade desulfurizing tower 13 by flue, contacts, remaining SO in flue gas while flue gas enters the packing layer 12 in two-grade desulfurizing tower with the carbide slag slurry B under the spraying layer circulated sprinkling in two-grade desulfurizing tower
2further with the Ca (OH) in carbide slag slurry B
2reaction generates calcium sulfite, calcium sulfite slurries enter the layering of sedimentation basin 20 bottom precipitation by two-grade desulfurizing slurry pool 15, bottom solid content enters in first grade desulfurizing slurry pool 8 at the calcium sulfite serum recycle of 30-50%, same forced oxidation generates gypsum slurries, and the overflow of sedimentation basin 20 upper clear supernate enters in clean solution tank 32;
Step 3: the flue gas after two-grade desulfurizing tower 13 purifies enters wet-esp demister 29 by flue 23, flue gas is after the purification of two-step desulfurization tower, containing more water smoke and PM2.5, flue gas enters between the positive plate 28 of wet-esp demister 29 after disperseing, under the negative electrode awns line 27 corona effect of periphery, water smoke in flue gas and PM2.5 are by chargedization and movement adheres on positive plate 28, the water smoke be adsorbed on positive plate 28 and PM2.5 wash away and enter clean solution tank 32 by the spray liquid of the wet electric spraying layer 26 in wet-esp demister, the clean flue gas of removing water smoke and PM2.5 is discharged by the exhanst gas outlet of wet-esp demister, complete the desulfurization and dedusting discharge of flue gas, clear liquid in clean solution tank 32 flows in first grade desulfurizing slurry pool 8, keep the water balance of first grade desulfurizing slurry pool 8 inside.
Step 4: the gypsum slurries in first grade desulfurizing slurry pool 8 after forced oxidation is after dewatering cyclone 38 classification, concentration of slurry is sent into vacuum belt filter 39 in the bottom slurry of 40-55% dewater further, and the final gypsum filter cake forming moisture content and be less than 10%, dewatering cyclone 38 top stream concentration sends to Waste Water Treatment lower than the slurries of 4%.
In above-mentioned acetylene sludge-gypsum process desulphurization smoke treatment process, the carbide slag slurry A in first grade desulfurizing slurry pool 8 and two-grade desulfurizing slurry pool 15 and carbide slag slurry B is provided by serum producing system, and concrete steps are as follows:
Carbide slag solid adds in carbide slag slurries liquid pool 33 by artificial or machinery, fresh water (FW) dilution is configured to concentration at 15-25% carbide slag slurry, after one-level cyclone 34 classification, underflow enters deckered stock chest 37, and and a small amount of fresh water (FW) be mixedly configured into concentration at 20-30%, the pH value carbide slag slurry A between 5-6, through pump and Cemented filling to first grade desulfurizing tower slurry pool 8; One-level cyclone 34 pushes up stream slurries and enters second cyclone 35 classification further, second cyclone 35 bottom slurry telegram in reply rock ballast slurry pool 33, second cyclone 35 pushes up stream slurries and goes to thin pulp pond 36, fresh water (FW) is diluted to concentration at 2-6%, the pH value carbide slag slurry B between 7-8, by pump and Cemented filling to two-grade desulfurizing slurry pool 15.
Following examples all adopt said apparatus and method to complete.
Embodiment 1
From the coal-fired flue-gas after boiler bag-type dust, exhaust gas volumn 500200m
3/ h, first grade desulfurizing smoke inlet sulfur dioxide concentration 3000mg/Nm
3, dust concentration 192mg/m
3, flue-gas temperature 135 DEG C.After acetylene sludge-gypsum process flue gas deep desulfuration dust arrester, wet electric exhanst gas outlet sulfur dioxide concentration 14mg/Nm
3, desulfuration efficiency reaches 99.5%, dust concentration 8mg/Nm
3, PM2.5 is lower than 15ug/Nm
3, flue-gas temperature 46 DEG C.
Embodiment 2
From the coal-fired flue-gas after boiler bag-type dust, exhaust gas volumn 270100m
3/ h, first grade desulfurizing smoke inlet sulfur dioxide concentration 2670mg/Nm
3, dust concentration 174mg/m
3, flue-gas temperature 130 DEG C.After acetylene sludge-gypsum process flue gas deep desulfuration dust arrester, wet electric exhanst gas outlet sulfur dioxide concentration 12mg/Nm
3, desulfuration efficiency reaches 99.5%, and flue dust does not detect, and PM2.5 is lower than 15ug/Nm
3, flue-gas temperature 44 DEG C.
Embodiment 3
From the coal-fired flue-gas after boiler bag-type dust, exhaust gas volumn 441253m
3/ h, first grade desulfurizing smoke inlet sulfur dioxide concentration 3640mg/Nm
3, dust concentration 192mg/m
3, flue-gas temperature 140 DEG C.After acetylene sludge-gypsum process flue gas deep desulfuration dust arrester, wet electric exhanst gas outlet sulfur dioxide concentration 15mg/Nm
3, desulfuration efficiency reaches 99.5%, flue dust 7mg/Nm
3, PM2.5 is lower than 15ug/Nm
3, flue-gas temperature 52 DEG C.
These are only better implementation example of the present invention, be not limited to the present invention, all within the present invention's spirit and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an acetylene sludge-gypsum process flue gas deep desulfuration dust arrester, is characterized in that comprising:
Desulfurizing tower, described desulfurizing tower is the spray column and packed tower of being connected by the first flue (9), wherein first grade desulfurizing tower (2) is spray column, and two-grade desulfurizing tower (13) is packed tower, and flue gas is sent into from the smoke inlet of first grade desulfurizing tower (2);
Wet-esp demister (29), be communicated with by the second flue (23) with the exhanst gas outlet of two-grade desulfurizing tower (13), the wet electric spraying layer (26) of this dedusting demister inside is connected by wet electric circulating pump (31) pipeline with clean solution tank (32);
Sedimentation basin (20), be communicated with the two-grade desulfurizing slurry pool (15) of two-grade desulfurizing tower (13) bottom, described sedimentation basin (20) supernatant liquor is communicated with clean solution tank (32), and described sedimentation basin (20) is communicated with the first grade desulfurizing slurry pool (8) of first grade desulfurizing tower (2) bottom respectively with the bottom of clean solution tank (32);
Dewatering system, be connected by pipeline with first grade desulfurizing slurry pool (8) bottom, be connected with oxidation air (7) in described first grade desulfurizing slurry pool (8), after the slurries be deposited at the bottom of pond are oxidized to gypsum slurries, send into dewatering system.
2. a kind of acetylene sludge-gypsum process flue gas deep desulfuration dust arrester according to claim 1, described first grade desulfurizing tower (13) inside is provided with 2-5 layer spraying layer, and the spraying layer in this desulfurizing tower is connected by desulfuration recycle pump pipeline with the desulfurization slurry pond at the bottom of tower.
3. a kind of acetylene sludge-gypsum process flue gas deep desulfuration dust arrester according to claim 2, described two-grade desulfurizing tower (13) inside is provided with 1-3 layer packing layer, form of bio-carrier adopts random packing or structured packing, each packing layer correspondence is provided with one deck spraying layer, and the spraying layer in this desulfurizing tower is connected by desulfuration recycle pump pipeline with the desulfurization slurry pond at the bottom of tower.
4. a kind of acetylene sludge-gypsum process flue gas deep desulfuration dust arrester according to claim 3, is equipped with desulfur agitator in described first grade desulfurizing slurry pool (8) and two-grade desulfurizing slurry pool (15).
5. a kind of acetylene sludge-gypsum process flue gas deep desulfuration dust arrester according to claim 1, described dewatering system comprises dewatering cyclone (38) and vacuum belt filter (39), described dewatering cyclone (38) is communicated with first grade desulfurizing slurry pool (8) bottom, wherein, the underflow opening of dewatering cyclone is connected with vacuum belt filter (39), top head piece is communicated to effluent treatment plant, the gypsum filter cake outward transport that vacuum belt filter is produced, filtrate recycle.
6. a kind of acetylene sludge-gypsum process flue gas deep desulfuration dust arrester according to any one of claim 1-5, also comprises the serum producing system to first grade desulfurizing slurry pool (8) and two-grade desulfurizing slurry pool (15) conveying carbide slag slurry.
7. a kind of acetylene sludge-gypsum process flue gas deep desulfuration dust arrester according to claim 6, described serum producing system comprises carbide slag slurries liquid pool (33), deckered stock chest (37) and thin pulp pond (36);
Described carbide slag slurries liquid pool (33) to be connected with pipeline two-stage cyclones by pump, wherein the top head piece of one-level cyclone (34) is communicated with second cyclone (35), the underflow opening of one-level cyclone (34) is communicated with deckered stock chest (37), the top head piece of second cyclone (35) is communicated with thin pulp pond (36), and the underflow opening of second cyclone (35) circulates with carbide slag slurries liquid pool (33) and is communicated with;
Thin pulp pond (36) is communicated with two-grade desulfurizing slurry pool (15) by pump and pipeline; Deckered stock chest (37) is communicated with first grade desulfurizing slurry pool (8) by pump and pipeline.
8. a kind of acetylene sludge-gypsum process flue gas deep desulfuration dust arrester according to claim 1, described sedimentation basin (20) epimere is provided with curb (18) and overfall (21); Described curb (18) one end is communicated with two-grade desulfurizing slurry pool (15), and the other end is communicated with the vertical conduit (19) in sedimentation basin, and described overfall (21) is communicated with clean solution tank (31).
9. an acetylene sludge-gypsum process flue gas deep desulfuration dust collection method, is characterized in that adopting the desulfation dust-extraction device according to any one of claim 1-8, specifically comprises the steps:
Step (1): temperature is sent in first grade desulfurizing tower (2) at the former flue gas of 130-170 DEG C, and flue gas contacts with the carbide slag slurry A under the spraying layer circulated sprinkling of first grade desulfurizing tower inside, the Ca (OH) in carbide slag slurry A
2with SO in flue gas
2reaction generates calcium sulfite, blast air by the oxidation air (7) in first grade desulfurizing slurry pool (8), reacted calcium sulfite slurries forced oxidation is become gypsum slurries and is deposited in first grade desulfurizing slurry pool (8) bottom;
Step (2): the flue gas after first grade desulfurizing tower (2) purification enters two-grade desulfurizing tower (13) by flue, flue gas contacts with the carbide slag slurry B under the spraying layer circulated sprinkling in two-grade desulfurizing tower while entering the packing layer (12) in two-grade desulfurizing tower, remaining SO in flue gas
2further with the Ca (OH) in carbide slag slurry B
2reaction generates calcium sulfite, calcium sulfite slurries enter sedimentation basin (20) bottom precipitation layering by two-grade desulfurizing slurry pool (15), bottom solid content enters in first grade desulfurizing slurry pool (8) at the calcium sulfite serum recycle of 30-50%, same forced oxidation generates gypsum slurries, and sedimentation basin (20) upper clear supernate overflow enters in clean solution tank (32);
Step (3): the flue gas after two-grade desulfurizing tower (13) purification enters wet-esp demister (29) by flue (23), flue gas is after the purification of two-step desulfurization tower, containing more water smoke and PM2.5, flue gas enters between the positive plate (28) of wet-esp demister (29) after disperseing, under negative electrode awns line (27) the corona effect of periphery, water smoke in flue gas and PM2.5 are by chargedization and movement adheres on positive plate (28), the water smoke be adsorbed on positive plate (28) and PM2.5 wash away and enter clean solution tank (32) by the spray liquid of the wet electric spraying layer (26) in wet-esp demister, the clean flue gas of removing water smoke and PM2.5 is discharged by the exhanst gas outlet of wet-esp demister, complete the desulfurization and dedusting discharge of flue gas, clear liquid in clean solution tank (32) flows in first grade desulfurizing slurry pool (8), keep the water balance that first grade desulfurizing slurry pool (8) is inner.
Step (4): the gypsum slurries after first grade desulfurizing slurry pool (8) interior forced oxidation is after dewatering cyclone (38) classification, concentration of slurry is sent into vacuum belt filter (39) in the bottom slurry of 40-55% dewater further, and the final gypsum filter cake forming moisture content and be less than 10%, dewatering cyclone (38) top stream concentration sends to Waste Water Treatment lower than the slurries of 4%.
10. a kind of acetylene sludge-gypsum process flue gas deep desulfuration dust collection method according to claim 9, carbide slag slurry A in described first grade desulfurizing slurry pool (8) and two-grade desulfurizing slurry pool (15) and carbide slag slurry B is provided by the serum producing system described in claim 6 or 7, and concrete steps are as follows:
Carbide slag solid adds in carbide slag slurries liquid pool (33) by artificial or machinery, fresh water (FW) dilution is configured to concentration at 15-25% carbide slag slurry, after one-level cyclone (34) classification, underflow enters deckered stock chest (37), and and a small amount of fresh water (FW) be mixedly configured into concentration at 20-30%, the pH value carbide slag slurry A between 5-6, through pump and Cemented filling to first grade desulfurizing tower slurry pool (8); One-level cyclone (34) top stream slurries enter second cyclone (35) classification further, second cyclone (35) bottom slurry telegram in reply rock ballast slurry pool (33), second cyclone (35) top stream slurries go to thin pulp pond (36), fresh water (FW) is diluted to concentration at 2-6%, the pH value carbide slag slurry B between 7-8, by pump and Cemented filling to two-grade desulfurizing slurry pool (15).
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