CN1279998C - Method for single stage circulation absorbing nitrogen oxide intail gas by dilute nitric acid - Google Patents
Method for single stage circulation absorbing nitrogen oxide intail gas by dilute nitric acid Download PDFInfo
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- CN1279998C CN1279998C CN 02138494 CN02138494A CN1279998C CN 1279998 C CN1279998 C CN 1279998C CN 02138494 CN02138494 CN 02138494 CN 02138494 A CN02138494 A CN 02138494A CN 1279998 C CN1279998 C CN 1279998C
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- nox
- nitric acid
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Abstract
The present invention belongs to the technical field of environmental protection. A nitric acid is used as an absorption liquid, water is used as a supplementary solvent, the operation is carried out under the normal pressure, air is led in a tower by a blower, and NOx is a treatment gaseous contaminant. Single-stage absorption is carried out, namely that the absorption tower is used as a main absorbing apparatus, a jet pump is used as an aid absorbing apparatus, and the volume concentration of treatable NOx is from 50% to 93%. The present invention has the advantages of equipment expense reduction, power consumption reduction and absorption effect improvement. The present invention does not use an alkaline liquor as an absorption liquid to avoid a secondary usage of the alkaline liquor process equipment in subsequent handling and the probability of secondary pollution; the emission concentration of NOx is less than 240 mg/m3, and the emission rate of NOx is less than 0.77 kg/h, which is less than or equal to the standard of the 'State atmospheric pollutant integration emission standard'.
Description
Technical field: the invention belongs to environmental protection technical field.
Background technology: using and producing in the industrial processes of nitric acid, with wet-treating NOx (NO, NO
2) method of tail gas is a lot, concludes to get up can be divided three classes, and mainly contains acid solution absorption process, alkaline solution absorption process, neutral solution absorption process (water, salt synthesis).Acid solution absorbs the genealogy of law and adopts rare nitric acid to make the solution of absorption of N Ox, has to reclaim the economic worth that nitric acid utilizes again.Since the chemical attribute of NOx, with following chemical reaction is arranged in rare nitric acid absorption of N Ox process:
Chemical equation has illustrated in the NOx absorption process, always has NO and discharges, thereby need carry out multistage circulation absorption, so just causes absorption equipment more, and power consumption is bigger, and tail gas also is difficult to reach national specified discharge standard.Though therefore known by people very early, failed to solve the problem of above-mentioned existence with the method for rare nitric acid absorption of N Ox.
Summary of the invention: purpose of the present invention is exactly the method for the nitrogen oxide in a kind of single-stage circulation absorption tail gas that proposes in order to address the above problem.
The manageable NOx volumetric concentration of the inventive method is 50%-93%, make absorption liquid with nitric acid, water is made additional solvent, atmospheric operation, in tower, blast air, the gaseous contaminant of handling is NOx, it is characterized in that with the absorption tower be main absorption equipment, adopt jet pump to be auxiliary absorption equipment, be provided with the pickle storage tank in the bottom, absorption tower, be provided with bleaching pipe in the pickle storage tank, have the pipe that the acid corrosion-resistant material of some apertures makes on the bleaching Guan Weiyi tube wall, NOx＜1 * 10 in rare nitric acid of bleaching
-3Kg/m
3, it is nitric acid that condenser condenses NOx is set, reduce and advance tower NOx gas concentration, and recycle cooling water, link to each other by pipeline between each equipment; Its technical process is: NOx tail gas passes through condenser, part NOx is condensed into rare nitric acid, condensed NOx sends in the pickle storage tank of bottom, absorption tower through jet pump, with the air that blasts simultaneously in diluted acid with wherein dilute nitric acid reaction, rare concentration of nitric acid is 5%-35% in the pickle storage tank, enters the absorption tower behind the bleaching pipe; Rare nitric acid is behind diluted acid pump, heat exchanger in the while pickle storage tank, the control temperature enters top, absorption tower at 9 ℃-35 ℃ and sprays and descend, with back flow of gas haptoreaction from bottom to top, reacted gas enters atmosphere, rare nitric acid temperature is 20 ℃-40 ℃ in the absorption tower, advances the ratio 4-6 of tower air and NOx volume: 1.
Compared with prior art has following beneficial effect: be reduced to single-stage by multistage absorption and absorb, reduced the input expense of device, reduced power consumption, controllable rare nitric acid temperature and rare nitric acid through bleaching, improved assimilation effect, it is nitric acid that condenser condenses NOx is set, and reduces and advances tower NOx gas concentration, cooling water Recycling.The input again and the contingent secondary pollution of subsequent handling alkali lye treating apparatus have been avoided as absorption liquid without alkali lye; NOx concentration of emission＜240mg/m
3, NOx rate of discharge＜0.77kg/h reaches and is lower than country's " discharge standard of air pollutants " set quota.
Description of drawings: accompanying drawing 1 is a process flow diagram of the present invention.Among Fig. 1,1 one absorption towers, 2.One sour pump, 3 one jet pumps, 4 one heat exchangers, 5 one condensers, 6 one bleaching pipes, 7 one pickle storage tanks, 8 one aiutages.
The specific embodiment: the present invention is described in detail below in conjunction with drawings and Examples.
Among Fig. 1, the NOx tail gas of 50%-93% is by behind the condenser 5, part NOx is condensed into rare nitric acid, condensed NOx sends in the pickle storage tank 7 of bottom, absorption tower through jet pump 3, with the air that blasts simultaneously (advance the ratio 4-6 of tower air and NOx volume: 1) in pickle storage tank 7 with wherein 5%～35% dilute nitric acid reaction, behind bleaching pipe 6, enter absorption tower 1; Simultaneously rare nitric acid is controlled temperature and is entered top, absorption tower at 9 ℃～35 ℃ and spray and descend in the pickle storage tank 7 through diluted acid pump 2, heat exchanger 4 after, be provided with heat exchanger tube in the absorption tower, the diluted acid temperature that control is advanced behind the tower is 20～40 ℃, with back flow of gas haptoreaction from bottom to top, reacted gas enters atmosphere by aiutage 8, NO
xConcentration of emission＜240mg/m
3
Claims (1)
1, the rare nitric acid single-stage circulation of a kind of usefulness absorbs the method for nitrogen oxide in the tail gas, accessible NOx volumetric concentration is 50%-93%, make absorption liquid with nitric acid, water is made additional solvent, atmospheric operation, in tower, blast air, the gaseous contaminant of handling is NOx, it is characterized in that with the absorption tower be main absorption equipment, adopt jet pump for auxiliary absorption equipment, be provided with the pickle storage tank in the bottom, absorption tower, be provided with the bleaching pipe in the pickle storage tank, have the pipe that the acid corrosion-resistant material of some apertures makes on the bleaching Guan Weiyi tube wall, NOx＜1 * 10 in rare nitric acid of bleaching
-3Kg/m
3, it is nitric acid that condenser condenses NOx is set, and reduces and advances tower NOx gas concentration, the Recycling cooling water links to each other by pipeline between each equipment; Its technical process is: NOx tail gas passes through condenser, part NOx is condensed into rare nitric acid, condensed NOx sends in the pickle storage tank of bottom, absorption tower through jet pump, with the air that blasts simultaneously in diluted acid with wherein dilute nitric acid reaction, rare concentration of nitric acid is 5%-35% in the pickle storage tank, enters the absorption tower behind the bleaching pipe; Rare nitric acid is behind diluted acid pump, heat exchanger in the while pickle storage tank, the control temperature enters top, absorption tower at 9 ℃-35 ℃ and sprays and descend, with back flow of gas haptoreaction from bottom to top, reacted gas enters atmosphere, rare nitric acid temperature is 20 ℃-40 ℃ in the absorption tower, advances the ratio 4-6 of tower air and NOx volume: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02138494 CN1279998C (en) | 2003-01-28 | 2003-01-28 | Method for single stage circulation absorbing nitrogen oxide intail gas by dilute nitric acid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02138494 CN1279998C (en) | 2003-01-28 | 2003-01-28 | Method for single stage circulation absorbing nitrogen oxide intail gas by dilute nitric acid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1425487A CN1425487A (en) | 2003-06-25 |
| CN1279998C true CN1279998C (en) | 2006-10-18 |
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ID=4749519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02138494 Expired - Lifetime CN1279998C (en) | 2003-01-28 | 2003-01-28 | Method for single stage circulation absorbing nitrogen oxide intail gas by dilute nitric acid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1279998C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101491745B (en) * | 2008-12-16 | 2011-04-20 | 山东洪业化工集团有限公司 | Argon-nitre adipate gas recovery system |
| CN103566739A (en) * | 2013-10-24 | 2014-02-12 | 南京大学 | Method for resource recovery of nitrogen oxides (NOx) in nitric acid industrial waste gas |
| CN104524944B (en) * | 2014-12-31 | 2016-09-07 | 康乃尔化学工业股份有限公司 | Nitric acid pot area exhaust treatment system |
| CN104984654A (en) * | 2015-07-22 | 2015-10-21 | 光为绿色新能源股份有限公司 | Exhaust gas recovery device for silicon material pickling machine, and exhaust gas recovery method for silicon material pickling machine |
| CN108014617B (en) * | 2017-11-12 | 2020-10-09 | 安徽金禾实业股份有限公司 | Method and device for treating concentrated nitrate tail gas through low-temperature ammonia reduction |
| CN114993046B (en) * | 2022-06-28 | 2023-11-14 | 清华大学 | Feed liquid transformation device, feed liquid transformation system and feed liquid transformation method |
-
2003
- 2003-01-28 CN CN 02138494 patent/CN1279998C/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| CN1425487A (en) | 2003-06-25 |
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Address after: Liuhe District of Nanjing City, Jiangsu province 210048 geguan Road No. 699 Patentee after: SINOPEC NANJING CHEMICAL RESEARCH INSTITUTE Co.,Ltd. Address before: Liuhe District of Nanjing City, Jiangsu province 210048 geguan Road No. 699 Patentee before: RESEARCH INSTITUTE OF NANJING CHEMICAL INDUSTRIAL Group |
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Granted publication date: 20061018 |