CN103877830B - A kind of containing NO 2the processing method of waste gas - Google Patents
A kind of containing NO 2the processing method of waste gas Download PDFInfo
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- CN103877830B CN103877830B CN201410077566.4A CN201410077566A CN103877830B CN 103877830 B CN103877830 B CN 103877830B CN 201410077566 A CN201410077566 A CN 201410077566A CN 103877830 B CN103877830 B CN 103877830B
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- water
- tower
- waste gas
- absorption
- reservoir chamber
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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
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- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The present invention relates to a kind of containing NO
2the processing method of waste gas, comprise the steps: in (1) reactor containing NO
2waste gas enters absorption tower at the bottom of tower, the NO in waste gas
3 -, NO
2be only absorbed by the water, the NO of formation enters regeneration of absorption solution tower together with water, the waste gas qualified discharge after absorbing in absorption tower; (2) NO in regeneration of absorption solution tower and water is entered after spray at packing layer and the O passed into
2counter current contacting, NO overflows and generates NO with oxygen reaction from water
2, NO
2be only absorbed by the water, so circulate, until NO is consumed totally; The water being removed NO in regeneration of absorption solution tower enters cooling in cooling tower; (3) in cooling tower, cooled water is back in absorption tower.The present invention is at NO
2nO in waste gas
2drawn when after reacting with water, NO does not also overflow from water, waste gas can qualified discharge.The inventive method is simple, cost is low, and NO
2waste gas can qualified discharge after absorbing.
Description
Technical field
The present invention relates to exhaust-gas treatment field, be specifically related to a kind of containing NO
2the processing method of waste gas.
Background technology
In the chemical reaction using nitric acid and nitrate, usually can produce containing NO
2waste gas.The organic chemical reactions participated in as the cleaning process of the descaling process of catalyst industry dissolution of metals process, catalyst industry nitrates decompose process, Treatment of Metal Surface, semi-conducting material, some nitric acid and inorganic polymer composite flocculant process etc.The processing method the most frequently used to acid waste gas is buck absorption process at present, but in process containing NO
2during waste gas, discharging waste gas is not up to standard.
The reason that absorption process toxic emission is not up to standard: by NO
2the character of reacting with water determines.Chemical equation 3NO
2+ H
2o=2HNO
3+ NO, NO
2nO is generated after reacting with water.NO is water insoluble, but the NO that reaction produces overflows and needs the time from water, and this just causes, and NO stops in absorbing liquid, enrichment.When absorbing liquid sprays in absorption tower, NO overflows from absorbing liquid, is oxidized to NO when running into oxygen
2direct discharge, causes toxic emission not up to standard.
Summary of the invention
Applicant finds that absorption process process is containing NO after deliberation
2during waste gas, NO
2the NO generated after reacting with water overflows and needs the time, therefore at NO from water
2drawn when after reacting with water, NO does not also overflow from water, waste gas can qualified discharge.The invention provides that a kind of method is simple based on above-mentioned discovery, process is containing NO
2during waste gas waste gas can qualified discharge containing NO
2the processing method of waste gas.
Concrete technical scheme of the present invention is as follows:
A kind of containing NO
2the processing method of waste gas, comprises the steps:
(1) what produce in reactor contains NO
2waste gas enters absorption tower from bottom, absorption tower, with the water counter current contacting in absorption tower, and the NO in waste gas
2be only absorbed by the water, the NO formed after absorbing
3 -, NO enters regeneration of absorption solution tower together with water, the waste gas qualified discharge after absorbing in absorption tower;
(2) NO in regeneration of absorption solution tower and water is entered after spray at packing layer and the O passed into
2counter current contacting, now, NO overflows and generates NO with oxygen reaction from water
2, NO
2be only absorbed by the water, so circulate, until NO is consumed totally; The water being removed NO in regeneration of absorption solution tower enters cooling in cooling tower; (3) in cooling tower, cooled water is back in absorption tower.Pressure in described absorption tower is normal pressure, and the pressure in regeneration of absorption solution tower is 1000Pa.
In order to make the NO entered together with absorbing liquid in regeneration of absorption solution tower be completely absorbed, enter in step (2) NO in regeneration of absorption solution tower and water in the one-level reservoir chamber in regeneration of absorption solution tower after spray, at packing layer and the O passed into
2counter current contacting, carries out first order absorption; The NO formed after the first order absorbs and the water after absorbing to enter in secondary reservoir chamber after spray at packing layer and the O passed into
2counter current contacting, carries out second level absorption; Water after the second level absorbs enters cooling in cooling tower.
In order to improve NO
2nO in waste gas
2removal effect, the pressure in described absorption tower is normal pressure, is 1000Pa in one-level reservoir chamber with the pressure in secondary reservoir chamber.
In order to improve the removal effect entering NO in regeneration of absorption solution tower, in step (2), in regeneration of absorption solution tower, the intake of oxygen accounts for NO
2nO in waste gas
2the 35%-40% of quality
Described regeneration of absorption solution tower comprises water tank, is provided with one-level reservoir chamber and secondary reservoir chamber in water tank, and communicate bottom described one-level reservoir chamber and secondary reservoir chamber, one-level reservoir chamber is provided with water inlet, and secondary reservoir chamber is provided with delivery port; Each reservoir chamber top is equipped with packing layer, is provided with spray equipment, is provided with gas feed below packing layer above packing layer; Described spray equipment is connected with water circulating pump, and described gas feed is connected with apparatus of oxygen supply.
The height of described packing layer is 0.4-0.8 rice, and the effect of above-mentioned packing layer is the contact area of expansion water and oxygen, extends the time of staying of water in oxygen.
The present invention utilizes NO
2the NO generated after reacting with water overflows the feature needing the time, at NO from water
2nO in waste gas
2drawn when after reacting with water, NO does not also overflow from water, waste gas can qualified discharge; Again the NO do not overflowed in the water of drawing is removed, by NO approach exhaustion.The inventive method is simple, cost is low, and NO
2waste gas can qualified discharge after absorbing.
Accompanying drawing explanation
Fig. 1 is of the present invention containing NO
2the processing technological flow figure of waste gas;
Fig. 2 is the structural representation of regeneration of absorption solution tower of the present invention;
Fig. 3 is the top view of Fig. 2.
Detailed description of the invention
The present invention is further illustrated below in conjunction with accompanying drawing.
See Fig. 1, of the present invention containing NO
2the processing method of waste gas, what comprise the steps: the interior generation of (1) reactor contains NO
2waste gas enters absorption tower from bottom, absorption tower, with the water counter current contacting in absorption tower, and the NO in waste gas
2be only absorbed by the water, the NO formed after absorbing
3 -, NO enters regeneration of absorption solution tower together with water, the waste gas qualified discharge after absorbing in absorption tower; Pressure in absorption tower is normal pressure;
(2) NO in regeneration of absorption solution tower and water is entered after spray at packing layer and the O passed into
2counter current contacting, now, NO overflows and generates NO with oxygen reaction from water
2, NO
2be only absorbed by the water, so circulate, until NO is consumed totally; The water being removed NO in regeneration of absorption solution tower enters cooling in cooling tower, and the pressure in regeneration of absorption solution tower is 1000Pa, and in regeneration of absorption solution tower, the intake of oxygen accounts for NO
2nO in waste gas
2the 35%-40% of quality;
(3) in cooling tower, cooled water is back in absorption tower.
Of the present invention " containing NO
2waste gas " be in the chemical reaction using nitric acid and nitrate, what usually can produce contains NO
2waste gas.The organic chemical reactions participated in as the cleaning process of the descaling process of catalyst industry dissolution of metals process, catalyst industry nitrates decompose process, Treatment of Metal Surface, semi-conducting material, some nitric acid and inorganic polymer composite flocculant process etc.
Enter in preferred step (2) NO in regeneration of absorption solution tower and water in the one-level reservoir chamber in regeneration of absorption solution tower after spray, at packing layer and the O passed into
2counter current contacting, carries out first order absorption; The NO formed after the first order absorbs and the water after absorbing to enter in secondary reservoir chamber after spray at packing layer and the O passed into
2counter current contacting, carries out second level absorption; Water after the second level absorbs enters cooling in cooling tower.Be 1000Pa with the pressure in secondary reservoir chamber in one-level reservoir chamber, in regeneration of absorption solution tower, the intake of oxygen accounts for NO
2nO in waste gas
2the 35%-40% of quality, and oxygen to enter in one-level reservoir chamber with the amount in secondary reservoir chamber by regulating with the pressure in secondary reservoir chamber in one-level reservoir chamber respectively, when in one-level reservoir chamber with the pressure in secondary reservoir chamber lower than this value time, pass into oxygen; When in one-level reservoir chamber with the pressure in secondary reservoir chamber higher than this value time, stop pass into oxygen.
In the present invention, when the acidity of the water after absorbing in regeneration of absorption solution tower reaches certain index, the water after this absorption can be back in reactor as technique water distribution and use as raw material; But be back to reactor if extract the water after partially absorbing in regeneration of absorption solution tower, then need supplementary fresh water, the amount of supplementing fresh water is identical with the amount of the water after the absorption that extraction enters in reactor.
See Fig. 2 and Fig. 3, regeneration of absorption solution tower of the present invention comprises water tank 1, is provided with one-level reservoir chamber 2 and secondary reservoir chamber 7 in water tank 1, communicates bottom described one-level reservoir chamber 2 and secondary reservoir chamber 7, one-level reservoir chamber 2 is provided with water inlet 4, and secondary reservoir chamber 7 is provided with delivery port 8; Each reservoir chamber top is equipped with packing layer 5, is provided with spray equipment 6 above packing layer 5, is provided with gas feed 3 below packing layer 5; Described spray equipment 6 is connected with water circulating pump 9, and described gas feed 6 is connected with apparatus of oxygen supply 10, and the height of above-mentioned packing layer is 0.4-0.8 rice, and packing layer adopts existing packing layer.
The spray equipment that the present invention adopts, absorption tower, cooling tower are to be commonly used this area in, so be not described further at this.
Embodiment
See Fig. 1, the present embodiment for the dissolution of metals production process in catalyst manufacturing, 6 hours dissolved copper 500kg.
(1) the air inlet amount entering reactor is 292(m
3/ h), in reactor, the generation of NO is 117(m
3/ h), containing NO
2absorption tower is entered from bottom, absorption tower, with the water counter current contacting in absorption tower, the NO in waste gas
2be only absorbed by the water, the NO formed after absorbing
3 -, NO enters regeneration of absorption solution tower together with water, the discharge amount of exhaust gas after absorbing in absorption tower is 233(m
3/ h), containing NO in waste gas
2< 100(mg/m
3), meet GB16297-1996 requirement, the pressure in absorption tower is normal pressure.
(2) enter NO in regeneration of absorption solution tower and water in the one-level reservoir chamber in regeneration of absorption solution tower after spray, at packing layer and the O passed into
2counter current contacting, now, NO overflows and generates NO with oxygen reaction from water
2, NO
2be only absorbed by the water, carry out first order absorption; The NO formed after the first order absorbs and the water after absorbing to enter in secondary reservoir chamber after spray at packing layer and the O passed into
2counter current contacting, now, NO overflows and generates NO with oxygen reaction from water
2, NO
2be only absorbed by the water, carry out second level absorption; Water after the second level absorbs enters cooling in cooling tower.Be 1000Pa with the pressure in secondary reservoir chamber in one-level reservoir chamber, in regeneration of absorption solution tower, the intake of oxygen accounts for NO
2nO in waste gas
235% of quality.
(3) in cooling tower, cooled water is back in absorption tower, uses as the absorbing liquid in absorption tower.
Claims (6)
1. one kind contains NO
2the processing method of waste gas, is characterized in that comprising the steps:
(1) what produce in reactor contains NO
2waste gas enters absorption tower from bottom, absorption tower, with the water counter current contacting in absorption tower, and the NO in waste gas
2be only absorbed by the water, the NO formed after absorbing
3 -, NO enters regeneration of absorption solution tower together with water, the waste gas qualified discharge after absorbing in absorption tower;
(2) NO in regeneration of absorption solution tower and water is entered after spray at packing layer and the O passed into
2counter current contacting, now, NO overflows and generates NO with oxygen reaction from water
2, NO
2be only absorbed by the water, so circulate, until NO is consumed totally; The water being removed NO in regeneration of absorption solution tower enters cooling in cooling tower;
(3) in cooling tower, cooled water is back in absorption tower;
Enter in step (2) NO in regeneration of absorption solution tower and water in the one-level reservoir chamber in regeneration of absorption solution tower after spray, at packing layer and the O passed into
2counter current contacting, carries out first order absorption; The NO formed after the first order absorbs and the water after absorbing to enter in secondary reservoir chamber after spray at packing layer and the O passed into
2counter current contacting, carries out second level absorption; Water after the second level absorbs enters cooling in cooling tower.
2. according to claim 1 containing NO
2the processing method of waste gas, it is characterized in that the pressure in described absorption tower is normal pressure, the pressure in regeneration of absorption solution tower is 1000Pa.
3. according to claim 1 containing NO
2the processing method of waste gas, is characterized in that the pressure in described absorption tower is normal pressure, is 1000Pa in one-level reservoir chamber with the pressure in secondary reservoir chamber.
4. according to any one of claims 1 to 3 containing NO
2the processing method of waste gas, is characterized in that the intake of oxygen in regeneration of absorption solution tower in step (2) accounts for NO
2nO in waste gas
2the 35%-40% of quality.
5. according to claim 1 containing NO
2the processing method of waste gas, it is characterized in that described regeneration of absorption solution tower comprises water tank, in water tank, be provided with one-level reservoir chamber and secondary reservoir chamber, communicate bottom described one-level reservoir chamber and secondary reservoir chamber, one-level reservoir chamber is provided with water inlet, and secondary reservoir chamber is provided with delivery port; Each reservoir chamber top is equipped with packing layer, is provided with spray equipment, is provided with gas feed below packing layer above packing layer; Described spray equipment is connected with water circulating pump, and described gas feed is connected with apparatus of oxygen supply.
6. according to claim 5 containing NO
2the processing method of waste gas, is characterized in that the height of described packing layer is 0.4-0.8 rice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410077566.4A CN103877830B (en) | 2014-03-05 | 2014-03-05 | A kind of containing NO 2the processing method of waste gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410077566.4A CN103877830B (en) | 2014-03-05 | 2014-03-05 | A kind of containing NO 2the processing method of waste gas |
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| Publication Number | Publication Date |
|---|---|
| CN103877830A CN103877830A (en) | 2014-06-25 |
| CN103877830B true CN103877830B (en) | 2015-12-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106890559A (en) * | 2015-12-19 | 2017-06-27 | 曾舟华 | Negative pressure storage method of purification treatment nitrogen oxides |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101036851A (en) * | 2007-02-09 | 2007-09-19 | 中北大学 | Method and apparatus for processing waste air including oxynitride |
| CN201551956U (en) * | 2009-08-14 | 2010-08-18 | 暨南大学 | Treatment device for nitrogen oxidation in waste gas |
| KR20130063081A (en) * | 2011-12-06 | 2013-06-14 | (주)기련이엔씨 | Method and apparatus for the treatment of a high concentration of nitrogen oxides using a absorbor and catalyst hybrid system |
| CN103349893A (en) * | 2013-07-24 | 2013-10-16 | 浙江南化防腐设备有限公司 | Method and equipment for wet process denitration |
-
2014
- 2014-03-05 CN CN201410077566.4A patent/CN103877830B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101036851A (en) * | 2007-02-09 | 2007-09-19 | 中北大学 | Method and apparatus for processing waste air including oxynitride |
| CN201551956U (en) * | 2009-08-14 | 2010-08-18 | 暨南大学 | Treatment device for nitrogen oxidation in waste gas |
| KR20130063081A (en) * | 2011-12-06 | 2013-06-14 | (주)기련이엔씨 | Method and apparatus for the treatment of a high concentration of nitrogen oxides using a absorbor and catalyst hybrid system |
| CN103349893A (en) * | 2013-07-24 | 2013-10-16 | 浙江南化防腐设备有限公司 | Method and equipment for wet process denitration |
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| CN103877830A (en) | 2014-06-25 |
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Address after: 210019 Jiangsu, Jianye District, Mount Lu Road, No. 188, a new center of the first phase of room 2602 Patentee after: JIANGSU SENSE WATER CO., LTD. Address before: 210019 Jiangsu City, Jianye Province, Yunlong District, Nanjing, No. 88 building, building B, No. 19 Patentee before: Jiangsu Shengshi Water Industry Development Co.,Ltd. |
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Effective date of registration: 20180213 Address after: 226400, Jiangsu, Nantong province Rudong County mouth chemical gathering area Patentee after: Nantong Shengshi Water Industry Co., Ltd. Address before: 210019 Jiangsu, Jianye District, Mount Lu Road, No. 188, a new center of the first phase of room 2602 Patentee before: JIANGSU SENSE WATER CO., LTD. |
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