CN105080327A - Method for desulfurizing and recovering NOx with alkali liquor - Google Patents
Method for desulfurizing and recovering NOx with alkali liquor Download PDFInfo
- Publication number
- CN105080327A CN105080327A CN201410192602.1A CN201410192602A CN105080327A CN 105080327 A CN105080327 A CN 105080327A CN 201410192602 A CN201410192602 A CN 201410192602A CN 105080327 A CN105080327 A CN 105080327A
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- nox
- flue gas
- desulfurization
- absorption tower
- denitrification
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention relates to a method for recovering NOx through desulfurization and denitrification, belongs to the field of processing of tail gas of a boiler, and particularly provides a method for absorbing SO2 and NOx in flue gas in an absorption tower through an alkaline absorbent, and analyzing and recovering NOx; SO2 is reacted to prepare sulfite or further prepare sulphate, so that the purpose of desulfurization is realized. The alkaline absorbent comprises sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate and compounding components thereof. The method disclosed by the invention has the benefits that (1) one device is used for dust removal, desulfurization and denitrification simultaneously, is small in occupied area, low in investment and low in operating cost; (2) the problem of recovering and utilizing NOx is solved, and the denitrification process is changed into a process for producing products with a high additional value, such as nitric acid; (3) a wet method is used for desulphurization and denitrification, the method has wide adaptability and is especially suitable for dust removal, desulfurization and denitrification of flue gas in a large number of small and medium boilers in China; (4) the main recovery product of sulfur is the sulfite, so that a space is provided for further utilization of by-products.
Description
The invention belongs to boiler exhaust gas process field.The present invention relates to a kind of method reclaiming the desulphurization denitration of NOx, more particularly, is in absorption tower, absorb SO in flue gas with alkali liquor absorption agent
2and NOx, then NOx reclaims by resolving, SO
2prepare sulphite by reaction or prepare the object that sulfate reaches desulfurization further.
Background technology
That current flue gas desulfurization and denitrification mainly adopts is " wet flue gas desulfurization (Wet-FGD) and NH
3sCR (SCR) technology denitration ".
At present, the method for flue gas desulfurization in the world oneself reach kind more than 100, the method for industrial application also about has 20 kinds.Wherein Wet Flue Gas Desulfurization Technique application accounts for about 85% of whole industrialization desulfurizer, and Wet Limestone/lime method accounts for about 80% of wet method, occupies an leading position in current technology, and other technologies such as ammonia process, alkaline process, Dual alkali etc. have application.
To the control of NOx, mainly take low nitrogen oxide burning technology and NH at present
3sCR (SCR).SCR is most effective in all denitrifying oxides, combines with combustion modifications, can reduce by the NOx emission of 90%.The SCR that Europe is equipped with Japan, can remove the NO of 60% ~ 80%, NH_3 leakage rate is lower than 5ppm.
Existing desulphurization denitration technology is all often carry out respectively in different devices and flow process, and as Wet-FGD-SCR method desulphurization denitration technology, also exist and cause investment large, operating cost is high, there is the shortcoming of resource consumption.
Summary of the invention
Combine for Wet-FGD+SCR that desulphurization denitration investment is large, operating cost is high, the higher ammonia of value need be consumed, by-product is worth low shortcoming, the present invention proposes the method for a kind of alkali lye desulfurization-recovery NOx, the method reaches dedusting, simultaneous SO_2 and NO removal reclaim the object of NOx, system investments is few, stable and reliable operation, resources and energy consumption are few, and by-product is worth high.
A method of alkali lye desulfurization-recovery NOx in absorption tower, absorbs SO in flue gas with alkaline absorbent
2and NOx, then NOx reclaims by resolving, SO
2prepare sulphite by reaction or prepare the object that sulfate reaches desulfurization further; Described alkaline absorbent comprise NaOH, potassium hydroxide, sodium carbonate, potash, sodium acid carbonate, saleratus ... and composite component, below with Na
2cO
3for example;
Its concrete steps:
SO in a, flue gas
2with the absorption of NOx
Flue gas enters in the middle part of absorption tower, with SO in alkaline solution absorption flue gas
2and NOx, reaction equation is as follows:
SO
2+H
2O＝H
2SO
3
xNO+yOH
-＝(NO)
x(OH
-)
y
The parsing regeneration of b, NOx
In absorption tower, arrange dividing plate to form air pocket, arrange parsing regenerating unit outside tower and flow through by slurries, negative pressure resolves NOx, and absorbing liquid is regenerated; Reaction equation is as follows:
Resolve reaction: (NO)
x(OH
-)
y=xNO+yOH
-
Removing and the recovery of sulphur of c, ash content
Slurries large portion circulation in absorption tower, small part exports and passes through filter, and filtered fluid part sends absorption tower back to, partly send process further to reclaim sodium sulfite and comprises a small amount of sodium sulphate; Filtration solid phase is waste sludge discharge;
The utilization of d, parsing gas
Be rich in the parsing gas of NOx, after only making with alkali liquor absorption, send post processing to produce nitric acid;
This technology be embodied in following some:
(1) solve dedusting, desulfurization and denitration problem in one apparatus, take up an area little, small investment, operating cost is low simultaneously.
(2) solve the recycling problem of NOx, denitrification process becomes the process of producing the high additive value products such as nitric acid.
(3) wet desulphurization denitration, can adapt to flue gas height dust-laden, high-sulfur, have wide adaptability, be particularly suitable for the flue gas ash removal of a large amount of medium and small boiler of China, desulphurization and denitration.
(4) the recovery primary product of sulphur is sulphite, for the further utilization of by-product leaves space, as: by condensing crystallizing separate mode, obtain pure sulphite and sulfate respectively; By aerating oxidation, condensing crystallizing mode, only obtains sulphate crystal; By the quick-drying process of logical hot blast, obtain sulfate; By regenerating alkali lye etc. with calcium alkali reaction.
Specific implementation process of the present invention: flue gas enters in the middle part of desulphurization denitration absorption tower, with spray from top under loop slurry counter current contacting, pass through spray washing, sulfur dioxide in flue gas, nitrogen oxide and dust are removed, again through the washing of tower top fresh water (FW), purifying smoke leaves absorption system and send chimney.Dividing plate is set in absorption tower and forms parsing air pocket, resolver is set outside absorption tower and flows through by slurries, after resolving gas purified treatment, send nitric acid processed etc.; Slurries large portion circulation in absorption tower, small part exports and passes through filter, and filtered fluid part sends absorption tower back to, and part send post processing to reclaim sulphur; Filtration solid phase is waste sludge discharge.
The invention has the beneficial effects as follows: (1) solves dedusting, desulfurization and denitration problem in one apparatus simultaneously, and take up an area little, small investment, operating cost is low; (2) solve the recycling problem of NOx, denitrification process becomes the process of producing the high additive value products such as nitric acid; (3) wet desulphurization denitration, can adapt to flue gas height dust-laden, high-sulfur, have wide adaptability, be particularly suitable for the flue gas ash removal of a large amount of medium and small boiler of China, desulphurization and denitration; (4) the recovery primary product of sulphur is sulphite, for the further utilization of by-product leaves space.
Accompanying drawing explanation
Accompanying drawing 1 is the process flow diagram of inventive embodiments 1
Detailed description of the invention
Embodiment 1
Desulphurization denitration absorption tower 1 in Fig. 1, resolver 2, filter 3, filtrate receiver 4, charging spout 5, feed pump 6, slush pump 7, filtrate pump 8, vavuum pump 9; Alkali material A, flue gas B, resolve gas C, purifying smoke D, washing process water E, reclaims sulphur F, waste residue G.
Temperature is that the flue gas B of 150 DEG C enters in the middle part of desulphurization denitration absorption tower 1, with spray from top under loop slurry, filtered fluid and washing process water counter current contacting, pass through spray washing, dust in flue gas, sulfur dioxide, nitrogen oxide are removed, and purifying smoke D temperature about 50 DEG C is left absorption system and sent chimney.In tower, slurries flow through the outer resolver 2 of tower, large portion fluid send charging spout 5 to send into desulphurization denitration absorption tower 1 by feed pump 6 again with the alkali material A feed liquid of input, few portion is exported by slush pump 7, pass through filter 3, filtered fluid is collected in filtrate receiver 4, carried by filtrate pump 8, part sends desulphurization denitration absorption tower 1 back to, and part is as reclaiming sulphur F; Filtering solid phase is that waste residue G discharges.Dividing plate is set in absorption tower and forms air pocket, at the outer resolver 2 of desulphurization denitration absorption tower 1 outer setting tower, arrange in absorption tower dividing plate formed air pocket obtain resolve gas, with electrolysis unit outside absorption tower resolve gas converge send the process of resolution gas C purifying processing device by vavuum pump 9 after send nitric acid processed etc.
Implementation result: desulfurization degree >=99%, denitration rate >=90%, the NOx rate of recovery >=85%.
Claims (1)
1. a method of alkali lye desulfurization-recovery NOx in absorption tower, absorbs SO in flue gas with alkaline absorbent
2and NOx, then NOx reclaims by resolving, SO
2prepare sulphite by reaction or prepare the object that sulfate reaches desulfurization further; Described alkaline absorbent comprise NaOH, potassium hydroxide, sodium carbonate, potash, sodium acid carbonate, saleratus ... and composite component;
Its concrete steps:
SO in a, flue gas
2with the absorption of NOx
Flue gas enters in the middle part of absorption tower, with SO in alkaline solution absorption flue gas
2and NOx;
The parsing regeneration of b, NOx
In absorption tower, arrange dividing plate to form air pocket, arrange parsing regenerating unit outside tower and flow through by slurries, negative pressure resolves NOx, and absorbing liquid is regenerated;
Removing and the recovery of sulphur of c, ash content
Slurries large portion circulation in absorption tower, small part exports and passes through filter, and filtered fluid part sends absorption tower back to, and partly send process further to reclaim sodium sulfite and comprise a small amount of sodium sulphate, filtration solid phase is waste sludge discharge;
The utilization of d, parsing gas
Be rich in the parsing gas of NOx, after only making with alkali liquor absorption, send post processing to produce nitric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410192602.1A CN105080327A (en) | 2014-05-05 | 2014-05-05 | Method for desulfurizing and recovering NOx with alkali liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410192602.1A CN105080327A (en) | 2014-05-05 | 2014-05-05 | Method for desulfurizing and recovering NOx with alkali liquor |
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|---|---|
| CN105080327A true CN105080327A (en) | 2015-11-25 |
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ID=54562202
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|---|---|---|---|
| CN201410192602.1A Pending CN105080327A (en) | 2014-05-05 | 2014-05-05 | Method for desulfurizing and recovering NOx with alkali liquor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106237818A (en) * | 2016-09-13 | 2016-12-21 | 成都创慧科达科技有限公司 | A kind of power plant stack gas denitrification apparatus and power plant stack gas processing method |
| CN106281786A (en) * | 2015-06-08 | 2017-01-04 | 沈阳市梅杉化工研究所 | A kind of environment cleaner |
| CN106731614A (en) * | 2017-01-14 | 2017-05-31 | 河北宏龙环保科技有限公司 | A kind of method and apparatus of flue gas desulfurization and denitrification |
| CN107311714A (en) * | 2017-04-27 | 2017-11-03 | 上海秀特化工科技有限公司 | A kind of hypergravity is electrolysed sylvite desulphurization denitration multi-component composite fertilizer processing method |
| CN108043189A (en) * | 2017-11-27 | 2018-05-18 | 西北矿冶研究院 | Zinc oxide combined desulfurization and denitrification system and method |
| CN108310954A (en) * | 2018-01-15 | 2018-07-24 | 佛山君帝环保科技有限公司 | A kind of semi-dry process desulfurization dust-removing technique |
| CN112473288A (en) * | 2020-11-25 | 2021-03-12 | 赛得利(九江)纤维有限公司 | Acid bath washing dust removal device and method |
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| CN101879404A (en) * | 2010-07-12 | 2010-11-10 | 华东理工大学 | Recycled flue gas desulfurization and denitration method |
| CN103028313A (en) * | 2012-09-12 | 2013-04-10 | 河南绿典环保节能科技有限公司 | Integrated desulfuration and denitration method for wet oxidation of flue gas |
| EP2578295A1 (en) * | 2010-05-31 | 2013-04-10 | Mitsubishi Heavy Industries, Ltd. | Exhaust gas treatment system and method |
| CN103239982A (en) * | 2013-05-24 | 2013-08-14 | 上海交通大学 | Method for dedusting and desulfurizing catalytic-cracking oil refining regenerated flue gas |
| CN103585864A (en) * | 2013-07-06 | 2014-02-19 | 蒋克旭 | Flue gas cleaning method capable of simultaneously desulfurizing and denitrifying |
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2014
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Patent Citations (6)
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| US20030026744A1 (en) * | 2001-08-06 | 2003-02-06 | Hakka Leo E. | Method and apparatus for NOx and SO2 removal |
| EP2578295A1 (en) * | 2010-05-31 | 2013-04-10 | Mitsubishi Heavy Industries, Ltd. | Exhaust gas treatment system and method |
| CN101879404A (en) * | 2010-07-12 | 2010-11-10 | 华东理工大学 | Recycled flue gas desulfurization and denitration method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106281786A (en) * | 2015-06-08 | 2017-01-04 | 沈阳市梅杉化工研究所 | A kind of environment cleaner |
| CN106237818A (en) * | 2016-09-13 | 2016-12-21 | 成都创慧科达科技有限公司 | A kind of power plant stack gas denitrification apparatus and power plant stack gas processing method |
| CN106731614A (en) * | 2017-01-14 | 2017-05-31 | 河北宏龙环保科技有限公司 | A kind of method and apparatus of flue gas desulfurization and denitrification |
| CN107311714A (en) * | 2017-04-27 | 2017-11-03 | 上海秀特化工科技有限公司 | A kind of hypergravity is electrolysed sylvite desulphurization denitration multi-component composite fertilizer processing method |
| CN108043189A (en) * | 2017-11-27 | 2018-05-18 | 西北矿冶研究院 | Zinc oxide combined desulfurization and denitrification system and method |
| CN108310954A (en) * | 2018-01-15 | 2018-07-24 | 佛山君帝环保科技有限公司 | A kind of semi-dry process desulfurization dust-removing technique |
| CN112473288A (en) * | 2020-11-25 | 2021-03-12 | 赛得利(九江)纤维有限公司 | Acid bath washing dust removal device and method |
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Application publication date: 20151125 |