CN104923045A - Oxynitride waste gas urea-absorption processing method - Google Patents
Oxynitride waste gas urea-absorption processing method Download PDFInfo
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- CN104923045A CN104923045A CN201410102797.6A CN201410102797A CN104923045A CN 104923045 A CN104923045 A CN 104923045A CN 201410102797 A CN201410102797 A CN 201410102797A CN 104923045 A CN104923045 A CN 104923045A
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Abstract
The invention discloses an oxynitride waste gas urea-absorption processing method, and belongs to the field of chemical waste gas processing. The provided method uses a waste gas collecting system, which comprises a packless blast cooling tower, a plate heat exchanger, a primary oxidation absorption tower, a secondary oxidation absorption tower, and a tertiary oxidation absorption tower; the gas to be processed goes through a draught fan, a water pump, and a urea stirring tank; the gas is subjected to a tertiary treatment, after the treatment, the processed waste gas can reach the emission standards at an emission height of 20 meters: the concentration of oxynitride (calculated in the form of NO2) is not more than 240 mg/Nm3, the concentration of carbon dust and dye particles is not more than 18 mg/Nm3, and the concentration of other particles is not more than 120 mg/Nm3. Compared with other methods, the urea absorption, degradation, and reduction method has the advantages of simple technology, strong adaptability, flexible and convenient operation, and low treatment cost, is especially suitable for processing a NOx source with an unstable emission amount, can be synchronously started with the production device, and is capable of solving the problems that in the conventional water-washing method, alkali absorption method, selective catalytic ammonia reduction method, the acidic polluted water, NaNO2, and NaNO3 are difficult to recycle, the side reactions are too many, the Cu-Cr catalyst is sintered, and the internal members in the equipment are sintered.
Description
Technical field
The present invention relates to a kind of oxynitrides waste gas urea absorption processing method, belong to chemical industry
Exhaust-gas treatment field.
Background technology
Those skilled in the art solve oxynitrides waste gas intractable problem through a large amount of tests, reduce large quantity of exhaust gas because processing the impact not exclusively caused environment.
At present, nitrogen oxide (NO
x) be one of Air Pollutant Discharge, be also a great problem of current air contaminant treatment.
Summary of the invention
The present invention is successfully by nitrogen oxide (NO
x) waste gas is recycled reaches discharge standard, and through oxidative absorption, Reducing and absorption, cool cycles, step is as follows:
1, first waste gas enter the NO in stair oxidation absorption tower
2first H is dissolved in
2o generates HNO
3, HNO
3nO is oxidized to NO by the Oxygen in Liquid agent that can be used as absorption tower
2, nitrous oxides exhaust gas is by the most of water-soluble NO of stair oxidation absorption tower removing
x.
2, stair oxidation absorbing liquid adopts closed cycle, and oxidative absorption liquid is cooled to absorb temperature by plate type heat exchanger, and the heat of absorbing liquid is taken out of by blast-type cooling tower again.
3, oxide (NO
x) waste gas send as second-stage reduction tower by blower fan after stair oxidation tower, second-stage reduction tower adopts urea absorption liquid to make reducing agent, and the NOX redox in waste gas is become N
2, CO
2, and H
2o, without side reaction after reduction, does not cause secondary pollution, reaches nontoxic discharge.
4, waste gas enters three grades of absorption reducing tower again by second-stage reduction tower, unabsorbed NO in waste gas
xby (NH
2) 2CO absorbing liquid carries out Reducing and absorption again, the NOx after finally reaching process in waste gas reaches GB16297-1996 atmosphere pollution comprehensive discharge secondary standard.
Preferably, above-mentioned washing absorption liquid adopts urea liquid, does not introduce other impurity.
Preferably, in above-mentioned washing absorption process, absorbing liquid adopts cyclic absorption, and absorbing liquid adopts closed cycle, wherein adopts closed cooling tower to carry out cool cycles to absorbing liquid.
In above-mentioned washing absorption process, have employed no-arbitrary pricing oxidative absorption tower, Reducing and absorption is abundant.
Preferably, above-mentioned absorption plant adopts water to absorb, and produce nitric acid product, by urea absorption, can not cause secondary pollution, exhaust emissions is up to standard.
Oxynitrides by waste gas absorption, is transferred in liquid by method of the present invention from gas, and the nitric acid in waste water reaches reuse after 30% concentration, after urea absorption liquid reaches capacity, is discharged to sewage disposal system and processes.
The invention provides a kind of oxynitrides waste gas urea absorption processing method, the waste gas after process meets Environment Protection and Drainage of Pulled Water standard completely, and nitrogen oxide is (with NO
2meter)≤240mg/Nm
3(nitric acid uses and other), carbon black dirt, dyestuff dirt particle≤18mg/Nm
3, other particle≤120mg/Nm
3
The invention provides waste gas, its technological process is simple, and urea absorption decomposition-reduction method has compared with other method that technique is simple, strong adaptability, the easy to operate and advantage such as elasticity is large, treatment cost is low, is particularly suitable for the NO administering discharge capacity extremely unstable
xoccurring source, can 100% synchronously drive to run with process units, have very high society and environmental benefit.
Method of the present invention is a kind of method of better society and environmental protection, reclaims the oxynitrides of waste gas to greatest extent.By to exhaust-gas treatment, draw effective exhaust gas treatment method, make harmful constituent in exhaust be down to national waste gas emission standard.Meanwhile, useful constituent nitric acid is separated.
Detailed description of the invention
Embodiment 1: waste gas recovery processing method during stair oxidation absorption tower produces, step is as follows:
(1) in the production in stair oxidation absorption tower produces, mist is contained steam and oxynitrides centralized collection, this mist is sent into stair oxidation washing absorption tower, absorbing liquid cyclic absorption in absorption tower, adopt closed cooling tower to cool to absorption tower simultaneously, ensure absorbing liquid cyclic absorption.
(2) when the concentration of nitric acid of absorbing liquid reaches 30%, produce absorbing liquid, supplement new absorbing liquid simultaneously.
(3) absorbing liquid produced is carried out filtration pretreatment, more than 0.1um insoluble impurities in preliminary removal liquid, obtains nitric acid product.
Waste gas after treatment meets Environment Protection and Drainage of Pulled Water standard completely.
Embodiment 2: two, three grades of Reducing and absorption towers produce in oxynitrides recovery and treatment method in urea solution and waste gas, step is as follows:
(1) in two, three grades of Reducing and absorption towers are produced, the oxynitrides reactive absorption in urea solution and tail gas, by the water leg of this Waste Water Centralized.
(2) urea absorption liquid 10% proportioning by mass percentage, when urea absorption liquid mass percentage concentration drops to 5%, adds in reduction scrubbing tower, removes oxynitrides in waste gas from urea tank diameter.Waste gas after process meets Environment Protection and Drainage of Pulled Water standard completely, and nitrogen oxide is (with NO
2meter)≤240mg/Nm
3(nitric acid uses and other), carbon black dirt, dyestuff dirt particle≤18mg/Nm
3, other particle≤120mg/Nm
3.
Claims (4)
1. oxynitrides waste gas urea absorption processing method, it is characterized in that, the method is made up of following steps:
(1), first waste gas enter the NO in stair oxidation absorption tower
2first H is dissolved in
2o generates HNO
3, HNO
3nO is oxidized to NO by the liquid-phase reduction agent that can be used as absorption tower
2, NO
2be dissolved in H
2o generates HNO
3nitrous oxides exhaust gas is by the most of water-soluble NO of one-level scrubbing tower removing
x, and then enter secondary and three grades of absorption reducing tower, simultaneously under urea reduction, be reduced into H
2o, CO
2and N
2; (2), the absorbing liquid cyclic absorption of first grade absorption tower, absorbing liquid carries out cool cycles absorption by plate type heat exchanger, air blast cooling tower; (3), secondary, three grades of reduction towers adopt urea in acid condition with NO
xredox reaction occurs, and end product is N
2, CO
2, and H
2o, and without side reaction, can not secondary pollution be caused, nontoxic discharge can be reached; (4), three grades of absorption towers provide powerful guarantee for absorbing waste gas further.
2. as the NO in claim 1 stair oxidation absorption tower
2first H is dissolved in
2o generates HNO
3, HNO
3nO is oxidized to NO by the liquid-phase reduction agent that can be used as absorption tower
2, nitrous oxides exhaust gas is by the most of water-soluble NO of stair oxidation tower removing
x, can also produce nitric acid product, as industrial chemicals, it is characterized in that, step (1) concentration of nitric acid controls at 10-30% simultaneously.
3., as claim 1, oxynitrides waste gas urea absorption processing method, is characterized in that, step (2), absorbing liquid cyclic absorption, absorbing liquid carries out cool cycles absorption by plate type heat exchanger, air blast cooling tower.
4. as claim 1, oxynitrides waste gas urea absorption processing method, is characterized in that, step (3), adopts two, three grades of reduction towers, and two, three grades of reduction tower reducing agents adopt urea.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102797.6A CN104923045A (en) | 2014-03-20 | 2014-03-20 | Oxynitride waste gas urea-absorption processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102797.6A CN104923045A (en) | 2014-03-20 | 2014-03-20 | Oxynitride waste gas urea-absorption processing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104923045A true CN104923045A (en) | 2015-09-23 |
Family
ID=54110664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410102797.6A Pending CN104923045A (en) | 2014-03-20 | 2014-03-20 | Oxynitride waste gas urea-absorption processing method |
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| CN (1) | CN104923045A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105776385A (en) * | 2016-02-29 | 2016-07-20 | 中冶南方工程技术有限公司 | Stainless steel liquid waste regeneration system based on spray roasting method and control method thereof |
| CN106110857A (en) * | 2016-08-04 | 2016-11-16 | 山东省化工研究院 | The processing method of waste gas in a kind of nitrous ether (ethyl nitrite) generating process |
| CN108033536A (en) * | 2017-12-07 | 2018-05-15 | 江苏丰山集团股份有限公司 | A kind of method of denitration of nitrating wasting acid |
| CN115430280A (en) * | 2022-09-23 | 2022-12-06 | 福建海峡科化股份有限公司 | Oxynitride waste gas treatment method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1064981A1 (en) * | 1999-07-02 | 2001-01-03 | The Boc Group, Inc. | Reduction of oxides of nitrogen in waste gas emissions |
| CN102974200A (en) * | 2012-12-05 | 2013-03-20 | 寿光富康制药有限公司 | Oxynitride waste gas treatment device and oxynitride waste gas treatment method |
| 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
- 2014-03-20 CN CN201410102797.6A patent/CN104923045A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1064981A1 (en) * | 1999-07-02 | 2001-01-03 | The Boc Group, Inc. | Reduction of oxides of nitrogen in waste gas emissions |
| CN102974200A (en) * | 2012-12-05 | 2013-03-20 | 寿光富康制药有限公司 | Oxynitride waste gas treatment device and oxynitride waste gas treatment method |
| 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105776385A (en) * | 2016-02-29 | 2016-07-20 | 中冶南方工程技术有限公司 | Stainless steel liquid waste regeneration system based on spray roasting method and control method thereof |
| CN105776385B (en) * | 2016-02-29 | 2019-01-04 | 中冶南方工程技术有限公司 | Stainless steel spent solution regeneration system and its control method based on spray roasting |
| CN106110857A (en) * | 2016-08-04 | 2016-11-16 | 山东省化工研究院 | The processing method of waste gas in a kind of nitrous ether (ethyl nitrite) generating process |
| CN108033536A (en) * | 2017-12-07 | 2018-05-15 | 江苏丰山集团股份有限公司 | A kind of method of denitration of nitrating wasting acid |
| CN115430280A (en) * | 2022-09-23 | 2022-12-06 | 福建海峡科化股份有限公司 | Oxynitride waste gas treatment method |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150923 |