CN202036917U - Integrated equipment for desulfurization, denitration and demetalization of flue gas - Google Patents

Integrated equipment for desulfurization, denitration and demetalization of flue gas Download PDF

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Publication number
CN202036917U
CN202036917U CN2011201059625U CN201120105962U CN202036917U CN 202036917 U CN202036917 U CN 202036917U CN 2011201059625 U CN2011201059625 U CN 2011201059625U CN 201120105962 U CN201120105962 U CN 201120105962U CN 202036917 U CN202036917 U CN 202036917U
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China
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absorption tower
pipeline
equipment
flue
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Expired - Lifetime
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CN2011201059625U
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Chinese (zh)
Inventor
史绍荣
杜文丹
王艳波
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Beijing SPC Environment Protection Tech Co Ltd
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Beijing SPC Environment Protection Tech Co Ltd
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Abstract

The utility model relates to integrated equipment for desulfurization, denitration and demetalization of flue gas. The integrated equipment comprises an absorption tower, wherein an absorption liquid area is arranged at the lower part in a tower body, an absorption liquid spray layer is arranged in the middle, and a demister and a flushing water layer are arranged at the upper part; an original flue gas inlet pipeline, a clean flue gas outlet pipeline, a supply system of acid gas catcher and desorption absorbent, a mist-removing water inlet pipeline, an absorption liquid circulating system and a slurry discharge and separation treatment system are connected outside the tower body; the original flue gas inlet pipeline is provided with a pressurization system and a forced oxidation system; and an oxidation air system is also connected outside the tower body. In the utility model, the integrated purification function of desulfurization, denitration and demetalization of the flue gas can be realized in one set of equipment, the system resistance and floor space are equivalent to the prior art, the by-product comprises ammonium sulfate and ammonium nitrate which are fertilizer components, and the waste water and waste residue are not produced. The integrated equipment has the characteristics of simple system, low cost, high recovery rate, etc.

Description

Flue gas desulfurization and denitrification removing heavy-metal integration apparatus
Technical field
The utility model belongs to the flue gases purification field, is specifically related to flue gas desulfurization and denitrification removing heavy-metal integration apparatus.
Background technology
Fire coal, fuel oil, combustion gas thermal power plant, metallurgy, chemical industry, contain sulfur dioxide (SO in every profession and trade discharged flue gas such as useless garbage disposal or the industrial tail gas admittedly 2), nitrogen oxide (mainly comprises NO and NO 2) and heavy metal pollutants such as (Hg, Ag), become the primary pollution source of atmosphere and soil.At present, flue gas or industrial tail gas pollution control technology are more, wherein comparative maturity, representative improvement flue gas SO 2Desulfur technology limestone-gypsum method, ammonia process, two alkaline process etc. are arranged, the denitration technology of administering the flue gas NOx pollutant has SCR (selective catalytic reduction, selective catalytic reduction), SNCR (Selective Non-Catalytic Reduction, non-selective catalytic reduction), low nitrogen burning method etc.
The most common desulfurization, denitrating technique is configured at present: the preceding fume high-temperature section of air preheater is established the SCR denitrification apparatus behind the electricity generation boiler economizer, installs desulfurizer after dedusting additional.Its shortcoming is: one-time investment is big, floor space is big, SR is big, power consumption is high, does not have the demercuration function.Still there be not at present ripe removing for the heavy metal in flue gas or the industrial tail gas.In a word, which kind of technology no matter just present actual conditions adopt, to SO 2With removing of NOx all is to realize not possessing the function that same set of device integrated efficient removes in the different device of two functions, does not more have the technology that in same set of device sulfur dioxide, nitrogen oxide and heavy metal is removed simultaneously.
The utility model content
The utility model is in the same set of device sulfur dioxide, nitrogen oxide and heavy metal to be carried out integrated efficient and remove in order to overcome the deficiencies in the prior art, a kind of flue gas desulfurization and denitrification removing heavy-metal integration apparatus to be provided, being implemented in.
The utility model adopts following technical scheme:
The flue gas desulfurization and denitrification removing heavy-metal integration apparatus that the utility model provides comprises the absorption tower that is used for the out of stock removing heavy-metal reaction of desulfurization, with the bottom, absorption tower by inlet pipeline link to each other be used to provide remove absorbent for ammonia pump, the sour gas agent for capturing pump that is used to provide the sour gas agent for capturing that links to each other by inlet pipeline with the bottom, absorption tower, the former flue that links to each other with the middle part, absorption tower, the ozone pipeline that links to each other with former flue, the slurries excavationg pump that links to each other by discharge line with the bottom, absorption tower, the clean flue that is used to discharge clean flue gas that links to each other with top, absorption tower, be arranged at the spraying layer of central region in the absorption tower, connect the external circulating line in absorption liquid zone and spraying layer in the absorption tower and be arranged at circulating pump on the circulating line, be arranged at the demister and the flushing water layer in internal upper part zone, absorption tower, the flushing water pipeline that is used to provide the demist water that links to each other with the flushing water layer.Wherein, spraying layer can be set to multilayer.
On the ozone pipeline by from former flue by being disposed with air duct, air separation unit, ozone generator as far as near order.
Link to each other with tank used for storing ammonia by pipeline for ammonia pump.
Sour gas agent for capturing pump links to each other with sour gas agent for capturing storage tank by pipeline.
On the discharge line after the slurries excavationg pump, be disposed with dust separator, economic benefits and social benefits separator, multi-effect evaporation system, chemical fertilizer drying system, chemical fertilizer pipe outlet; The top of dust separator is connected with sour gas agent for capturing pipeline, and the port of export of sour gas agent for capturing pipeline links to each other with the circulating line of circulating pump.
Clean flue links to each other with chimney.
Former flue before the ozone pipeline is provided with booster fan.
Also be connected with the air duct that is used to provide oxygen or ozone in the bottom, absorption tower.Air duct is provided with oxidation fan.When the oxygen content in the flue gas is enough to that ammonium sulfite/ammonium nilrite is oxidized to ammonium sulfate/ammonium nitrate, can not establish this road oxidation air system.
Be connected with the bypass flue on the former flue before the booster fan, the port of export of bypass flue links to each other with clean flue.
Advantage of the present utility model and beneficial effect are as follows:
(1) in a covering device, realize the integrated purification function of flue gas desulfurization and denitrification removing heavy-metal, and its SR is only suitable with existing limestone-gypsum method; Relatively the SCR denitration adds the wet method desulfurization and unites and arrange and reduced about 30%; Take up an area of also only suitable with the limestone-gypsum subtraction unit;
(2) accessory substance is ammonium sulfate and ammonium nitrate, does not produce waste water, waste residue;
(3) sour gas agent for capturing separable come out after using returns in the tower by circulating pump and to recycle;
(4) amount of nitrogen oxides is reduced to below the 50mg in the clean flue gas, and content of sulfur dioxide is reduced to below the 50mg.
In a word, the utlity model has system simple, be easy to realize, characteristics such as cost is low, rate of recovery height.
Description of drawings
Fig. 1 is the structural representation of equipment described in the utility model
Among the figure: the former flue of 1-, 2-booster fan, 3-absorption tower, the 4-demister, the clean flue of 5-, 6-chimney, 7-bypass flue, 8-flushing water pipeline, 9-air duct, the 10-air separation unit, 11-ozone generator, 12-ozone pipeline, the 13-air duct, 14-oxidation fan, 15-tank used for storing ammonia, 16-is for ammonia pump, 17-sour gas agent for capturing storage tank, 18-sour gas agent for capturing pump, 19-slurries excavationg pump, 20-dust separator, 21-economic benefits and social benefits separator, the 22-multi-effect evaporation system, 23-chemical fertilizer drying system, 24-chemical fertilizer pipe outlet, 25-sour gas agent for capturing pipeline, the 26-circulating pump, the 27-spraying layer, 28-washes water layer.
The specific embodiment
Below in conjunction with drawings and Examples equipment described in the utility model is done a detailed description, but not as to restriction of the present utility model.
Fig. 1 is the structural representation of equipment described in the utility model, it is as follows to utilize equipment shown in Figure 1 to carry out the integral method of flue gas desulfurization and denitrification removing heavy-metal: former flue gas is through booster fan 2 superchargings, enter former flue 1, before entering absorption tower 3, add a certain amount of ozone (O to former flue 1 from ozone pipeline 12 3), the nitric oxide in the former flue gas (NO) being oxidized to high price nitrogen oxide (NOx) such as nitrogen dioxide, former afterwards flue gas enters absorption tower 3 from former flue 1 import.The former flue gas that enters behind the absorption tower 3 upwards flows through spraying layer 27, the SO in the flue gas 2, NOx and heavy metal absorbed by the spraying layer 27 sprays absorption liquid washing reaction that contains a certain proportion of sour gas agent for capturing, absorbent down, the clean flue gas after removing is discharged by chimney 6 through clean flue 5 after removing droplet through demister 4 and flushing water layer 28.The flushing water pipeline 8 that links to each other with flushing water layer 28 is used to provide the demist water.
The absorption tower 3 of deviating from absorption plant as flue gas washing is spray column.In the absorption tower absorption liquid be sour gas agent for capturing, moisture arranged, remove absorbent ammoniacal liquor, the mix emulsion fluid of reaction intermediate by-products ammonium sulfite and ammonium nilrite and byproduct of reaction ammonium sulfate and ammonium nitrate etc.Absorption liquid must keep certain liquid level in tower, to guarantee the absorption reaction time.The sour gas agent for capturing joins absorption liquid by sour gas agent for capturing pump 18, certain density ammoniacal liquor is supplied with by tank used for storing ammonia 15, join absorption liquid after for ammonia pump 16 meterings, both all should add absorption liquid below liquid level, escape to prevent sour gas agent for capturing and ammoniacal liquor.Absorption liquid is transported to spraying layer 27 by circulating pump 26, the SO in nozzle atomization washing, purifying flue gas 2, NOx and heavy metal.Wherein, the SO in the flue gas 2, NOx is converted into ammonium sulfite, ammonium nilrite, be dissolved in the absorption liquid, be ammonium sulfate, nitrous acid by oxidation step subsequently.
The addition of sour gas agent for capturing is directly proportional with sulfur dioxide in flue gas content, is initially adding fashionablely, and the volume ratio that sour gas agent for capturing and moisture are pressed 1/1-5 adds.The concentration that removes absorbent ammoniacal liquor that adds is unrestricted substantially, and concentration commonly used all can be used at the ammoniacal liquor of 1-25%.According to pH value in the absorption tower and denitrification efficiency control ammoniacal liquor addition.
Be provided with the ozone forced oxidation system (not indicating among the figure) that forms by air duct 9, air separation unit 10 and ozone generator 11 in this equipment.Air enters air separation unit 10 through air duct 9 and makes high-concentration oxygen or purity oxygen, obtains ozone through ozone generator 11 ionization again.Ozone also available air directly obtains through ozone generator 11 ionization, but the ozone concentration that obtains with the air direct ionization is lower, and power consumption is higher.Ozone is uniformly distributed in the former flue by flue gas-ozone uniform device (applying for a patent separately), and the oxidation of nitric oxide that is used for former flue gas is high price nitrogen oxide such as nitrogen dioxide.The addition of ozone, relevant with the content of nitric oxide in the flue gas and nitrogen dioxide.The coefficient of excess of ozone is 1.03-2, and coefficient of excess is bigger to the removal of nitrogen oxide effectiveness affects.
Also be provided with by air duct 13 in this equipment and be arranged on the oxidation air system that the oxidation fan 14 on the air duct 13 forms (indicating among the figure).Air is entered by air duct 13, delivers in the absorption tower 3 by oxidation fan 14, establishes aeration tube in the absorption tower 3, and it is uniform to be beneficial to oxidation air.Oxidation air is in order to be sulfite oxidation ammonium sulfate, and ammonium nilrite is oxidized to ammonium nitrate.The coefficient of excess of oxidation air amount is 1-3, the SO of its addition and inlet 2And NOx content is relevant.The oxidation air system also can be used to ozone supply in absorption tower 3.When the oxygen in the flue gas or ozone content are big, the oxidation air system can be set.
Ammonium sulfate in slurries, after ammonium nitrate reaches certain concentration, discharge through slurries excavationg pump 19, at first the dust separation in the slurries is come out through dust separator 20, slurries after the separation are sent to and carry out in the economic benefits and social benefits separator 21 separating of sour gas agent for capturing and saline solution, isolated sour gas agent for capturing returns absorption tower 3 by circulating pump 26 and recycles, simultaneously, contain ammonium sulfate, the chemical fertilizer treatment process that is sent to the saline solution of ammonium nitrate continues to handle, obtain byproduct of ammonium sulfate through multi-effect evaporation system 22 and chemical fertilizer drying system 23, ammonium nitrate fertilizer, the gained chemical fertilizer is discharged by chemical fertilizer pipe outlet 24.
Heavy metal in the flue gas is caught and is enriched in the sour gas agent for capturing by the oily matter in the sour gas agent for capturing, run up to finite concentration after, carry out desorption with chemical, the heavy metal that desorption goes out is concentrated and to be carried out harmless treatment.

Claims (10)

1. flue gas desulfurization and denitrification removing heavy-metal integration apparatus, it is characterized in that, comprise the absorption tower (3) that is used for the out of stock removing heavy-metal reaction of desulfurization, with bottom, absorption tower (3) by inlet pipeline link to each other be used to provide remove absorbent for ammonia pump (16), the sour gas agent for capturing pump (18) that is used to provide the sour gas agent for capturing that links to each other by inlet pipeline with bottom, absorption tower (3), the former flue (1) that links to each other with absorption tower (3) middle part, the ozone pipeline (12) that links to each other with former flue (1), the slurries excavationg pump (19) that links to each other by discharge line with bottom, absorption tower (3), the clean flue (5) that is used to discharge clean flue gas that links to each other with top, absorption tower (3), be arranged at the spraying layer (27) of the interior central region in absorption tower (3), connect the external circulating line of interior absorption liquid zone, absorption tower (3) and spraying layer (27) and be arranged at circulating pump (26) on the circulating line, be arranged at the demister (4) and the flushing water layer (28) in internal upper part zone, absorption tower (3), the flushing water pipeline (8) that is used to provide the demist water that links to each other with flushing water layer (28).
2. equipment as claimed in claim 1 is characterized in that, goes up at ozone pipeline (12) and presses from former flue (1) by be disposed with air duct (9), air separation unit (10), ozone generator (11) as far as near order.
3. equipment as claimed in claim 1 is characterized in that, links to each other with tank used for storing ammonia (15) by pipeline for ammonia pump (16).
4. equipment as claimed in claim 1 is characterized in that, sour gas agent for capturing pump (18) links to each other with sour gas agent for capturing storage tank (17) by pipeline.
5. equipment as claimed in claim 1, it is characterized in that, on slurries excavationg pump (19) discharge line afterwards, be disposed with dust separator (20), economic benefits and social benefits separator (21), multi-effect evaporation system (22), chemical fertilizer drying system (23), chemical fertilizer pipe outlet (24); The top of dust separator (20) is connected with sour gas agent for capturing pipeline (25), and the port of export of sour gas agent for capturing pipeline (25) links to each other with the circulating line of circulating pump (26).
6. equipment as claimed in claim 1 is characterized in that, clean flue (5) links to each other with chimney (6).
7. equipment as claimed in claim 1 is characterized in that, ozone pipeline (12) former flue (1) before is provided with booster fan (2).
8. equipment as claimed in claim 1 is characterized in that, (3) bottom also is connected with the air duct (13) that is used to provide oxygen or ozone on the absorption tower.
9. equipment as claimed in claim 8 is characterized in that, air duct (13) is provided with oxidation fan (14).
10. equipment as claimed in claim 1 is characterized in that, is connected with bypass flue (7) on booster fan (2) former flue (1) before, and the port of export of bypass flue (7) links to each other with clean flue (5).
CN2011201059625U 2011-04-12 2011-04-12 Integrated equipment for desulfurization, denitration and demetalization of flue gas Expired - Lifetime CN202036917U (en)

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CN2011201059625U CN202036917U (en) 2011-04-12 2011-04-12 Integrated equipment for desulfurization, denitration and demetalization of flue gas

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Application Number Priority Date Filing Date Title
CN2011201059625U CN202036917U (en) 2011-04-12 2011-04-12 Integrated equipment for desulfurization, denitration and demetalization of flue gas

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102188882A (en) * 2011-04-12 2011-09-21 王晓晔 Integrated method for simultaneously realizing denitrification, desulfurization and heavy metal removal from flue gas, and special equipment suitable for the method
CN104056535A (en) * 2014-06-03 2014-09-24 陈浩 Organic absorbent process flue gas desulfurization, denitrification and demercuration system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102188882A (en) * 2011-04-12 2011-09-21 王晓晔 Integrated method for simultaneously realizing denitrification, desulfurization and heavy metal removal from flue gas, and special equipment suitable for the method
CN104056535A (en) * 2014-06-03 2014-09-24 陈浩 Organic absorbent process flue gas desulfurization, denitrification and demercuration system
CN104056535B (en) * 2014-06-03 2016-10-05 陈浩 A kind of organic absorbent method flue gas desulfurization and denitrification demercuration system

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Granted publication date: 20111116

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