CN102807197B - Control and recovery system for nitrogen dioxide content - Google Patents
Control and recovery system for nitrogen dioxide content Download PDFInfo
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- CN102807197B CN102807197B CN201210314824.7A CN201210314824A CN102807197B CN 102807197 B CN102807197 B CN 102807197B CN 201210314824 A CN201210314824 A CN 201210314824A CN 102807197 B CN102807197 B CN 102807197B
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- acid
- recovery system
- water
- finished
- diluted acid
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
The invention provides a recovery system for the nitrogen dioxide content, which comprises a finished product acid jar, a gas cooler, a dilute acid circulating tank and a water ejector, wherein the input end of the gas cooler is respectively connected with the output end of a compressed air header pipe and a nitrogen header pipe; the finished product acid jar is connected with the water ejector; the pipeline of the water ejector is provided with a dilute acid circulating pump; the inside of the dilute acid circulating tank is provided with a cooling water tube nest; a pressure balancing tube is arranged between the finished product acid jar and the dilute acid circulating tank; the finished product acid jar is connected with the input end of the water ejector; a gas distributor is arranged in the finished product acid jar; and the output end of the water ejector is connected with the dilute acid circulating tank. According to the recovery system for the nitrogen dioxide content, the content of nitrogen dioxide in the finished product acid jar can be controlled, nitrogen dioxide decomposed from the finished acid can be effectively recovered, and the recovered nitrogen dioxide can be converted into the finished product acid, thereby saving energy, protecting the environment and reducing cost.
Description
Technical field
The present invention relates to control and recovery system in a kind of nitric acid process that manufactures a finished product, specifically a kind of nitrogen peroxide that the nitrogen peroxide decomposed in nitric acid can be controlled and reclaimed is controlled and recovery system.
Background technology
Nitric acid is one of most important Chemicals, nitric acid industrial mainly with oxidation proceses of ammonia production, in order to manufacture chemical fertilizer, explosive, nitrate etc.Pure nitric acid is colourless transparent liquid, and the industrial goods concentrated nitric acid shows brown because being dissolved with nitrogen peroxide.According to the requirement of GB/T 337.1-2002 industrial nitric acid, the concentrated nitric acid technical indicator is established 98 acid and two kinds of specifications of 97 acid, the massfraction of the nitrous acid that these two kinds of specifications are contained, and 98 acid are for being not more than 0.5%, 97 acid for being not more than 1.0%.Its desired value is for guaranteeing index, but in the device of existing production nitric acid, due to bleaching in producing not, temperature is high or the various reasons such as diluted acid pollution, cause outbound finished product nitric acid nitrogen peroxide to exceed standard, do not reach customer requirement, and the reddish-brown nitrogen peroxide of emptying do not obtain efficient recovery, contaminate environment and waste resource, cause cost to rise.
Summary of the invention
The object of the present invention is to provide and a kind ofly can control the nitrogen peroxide that decomposes in nitric acid and the nitrogen peroxide of nitrogen peroxide recycling is controlled and recovery system.
The present invention has adopted following technical scheme: a kind of control of nitrogen peroxide content and recovery system, comprise finished acid tank, gas cooler, diluted acid circulation groove and water-jet exhauster, the input terminus of described gas cooler is connected with nitrogen header pipe with pneumatic manifold respectively, be equipped with valve on described pneumatic manifold and nitrogen header pipe, described finished acid tank and described water-jet exhauster are connected and are provided with the by-pass valve control of water-jet exhauster, the pipeline of described water-jet exhauster is connected with the diluted acid recycle pump, the top hole pressure of described diluted acid recycle pump is 0.6～0.8MPa, be provided with the water coolant tubulation in described diluted acid circulation groove, be respectively equipped with blow-down pipe on described finished acid tank and diluted acid circulation groove and correspondence is provided with tensimeter, be provided with pressure equalizing pipe between described finished acid tank and diluted acid circulation groove, described finished acid tank is built-in with gas distributor, described finished acid tank is connected with the input terminus of described water-jet exhauster, the output terminal of described water-jet exhauster is connected with described diluted acid circulation groove.
beneficial effect: decompose nitrogen peroxide out in both can having controlled the content of nitrogen peroxide and can effectively reclaim finished acid after use the present invention in the acid that manufactures a finished product, can also convert the nitrogen peroxide of recovery to the finished product diluted acid, energy-conserving and environment-protective and cost-saving.
The accompanying drawing explanation
Fig. 1 is connection diagram of the present invention.
In figure: 1, finished acid tank, 2, gas cooler, 3, water-jet exhauster, 4, the diluted acid circulation groove,
4.1, the water coolant tubulation, 5, gas distributor, 6, the diluted acid recycle pump, 7.1, valve a,
7.2, valve b, 7.3, valve c, 7.4, valve d, 7.5, valve e, 7.6, valve f, 7.7, valve g, 7.8, valve h, 7.9, valve i,
7.10, valve j, 7.11, valve k 8, pressure equalizing pipe, 9, blow-down pipe, 10, tensimeter, 11.1, pneumatic manifold, 11.2, nitrogen header pipe.
Embodiment
Below in conjunction with accompanying drawing, be described in further detail:
As shown in Figure 1, a kind of recovery system of nitrogen peroxide content, this system comprises finished acid tank 1, gas cooler 2, water-jet exhauster 3 and diluted acid circulation groove 4, finished acid tank 1 bottom is equipped with gas distributor 5, the input terminus of gas distributor 5 is connected with pipeline with the output terminal of gas cooler 2, the input terminus of gas cooler 2 is connected with nitrogen header pipe 11.2 with pneumatic manifold 11.1 respectively, the main pipe line that house steward is delivering gas, be respectively equipped with valve c7.3 and valve d7.4 on pneumatic manifold 11.1 and nitrogen header pipe 11.2 in order to control the switch of pneumatic manifold 11.1 and nitrogen header pipe 11.2, finished acid tank 1 is connected with water-jet exhauster 3 by pipeline, pipeline is provided with valve a7.1 and flows in order to control nitrogen peroxide in finished acid tank 1, water-jet exhauster 3 is the negative reaction device, the input terminus of water-jet exhauster 3 is communicated with the output terminal pipeline of diluted acid circulation groove 4, the connection line of the output terminal of diluted acid diluted acid circulation groove 4 and water-jet exhauster 3 input terminuss is provided with diluted acid recycle pump 6 for promoting circulation, be respectively equipped with valve i7.9 and valve h7.8 on the connection line of diluted acid recycle pump 6 and water-jet exhauster 3 and diluted acid circulation groove, the output terminal of water-jet exhauster 3 is connected with diluted acid circulation groove 4 pipelines, be provided with water coolant tubulation 4.1 in diluted acid circulation groove 4, the cooling temperature of water coolant tubulation 4.1 is controlled by valve j7.10 and valve k7.11, be respectively equipped with blow-down pipe 9 on finished acid tank 1 and diluted acid circulation groove 4 and correspondence is provided with tensimeter 10, the adjusting of can reducing pressure by the valve of opening blow-down pipe 9 during hypertonia in finished acid tank 1 and diluted acid circulation groove 4, be provided with pressure equalizing pipe 8 between finished acid tank 1 and diluted acid circulation groove 4 in order to regulate the pressure equilibrium of finished acid tank 1 and diluted acid circulation groove 4.
The Controlling System Air can be bleached nitric acid, nitrogen peroxide in acid (nitric acid and nitrogen peroxide bonding force are weak) is overflowed, HNO
3+ NO
2==HNO
3+ 4NO
2, the nitrogen peroxide content that nitric acid at high temperature decomposes simultaneously is more, and next less at low temperature or normal temperature, concentrated nitric acid is at light and the lower decomposition reaction equation 4HNO that is heated
3==2H
2o+4NO
2+ O
2.The recovery system reaction formula is 2H
2o+4NO
2+ O
2=4HNO
3.
External finished product nitric acid enters finished acid tank 1, and while opening valve c7.3, during pneumatic manifold 11.1 work, air (open during wet weather valve d7.4 open nitrogen header pipe 11.2 utilize nitrogen) is cooling by gas cooler 2, open valve g7.7, the water of condensation produced is discharged from gas cooler 2 bottoms.Valve e7.5 and valve f7.6 can be used for controlling the cooling temperature of gas in gas cooler 2, through dehydration and cooling air (from bottommost 20cm place) the intermediate gas sparger 5 that enters 1 end of finished acid tank, can reduce the temperature in finished acid tank 1, can reduce the content of decomposing nitrogen dioxide in nitric acid like this, then gas distributor 5 is uniformly distributed and drives NO in nitric acid
2desorb, use the air bleaching concentrated nitric acid.The water of diluted acid circulation groove 4 is by 6 runnings of diluted acid recycle pump, and diluted acid recycle pump 6 top hole pressures are controlled at 0.7MPa, make the NO of finished acid tank field 1 by water-jet exhauster 3
2be absorbed, between diluted acid circulation groove 4 and finished acid tank 1, pressure equalizing pipe 8 arranged, both are equal to by pressure, working pressure approximates normal atmosphere.The water acidity of diluted acid circulation groove 4 strengthens gradually, and concentration rises, and rises to 40% and can work as the commercial acid sale or work as raw material production ammonium nitrate etc., NO
2be absorbed liberated heat simultaneously and taken away by diluted acid circulation groove 4 water coolants, make the absorption reaction continuity.
Claims (5)
1. the control of a nitrogen peroxide content and recovery system, it is characterized in that: comprise the finished acid tank, the diluted acid circulation groove, gas cooler and water-jet exhauster, described finished acid tank is built-in with gas distributor, the output terminal of described gas cooler is connected with the input terminus of described gas distributor, the input terminus of described gas cooler is connected with nitrogen header pipe with pneumatic manifold respectively, described finished acid tank is connected with the input terminus of described water-jet exhauster, the output terminal of described water-jet exhauster is connected with described diluted acid circulation groove input terminus, described water-jet exhauster input terminus follows the groove output terminal through pipeline and diluted acid and is connected, the connection line of described water-jet exhauster input terminus and diluted acid circulation groove output terminal is provided with recycle pump.
2. the control of nitrogen peroxide content according to claim 1 and recovery system, is characterized in that: between described diluted acid circulation groove and finished acid tank, be provided with pressure equalizing pipe.
3. the control of nitrogen peroxide content according to claim 2 and recovery system, it is characterized in that: be respectively equipped with blow-down pipe on described diluted acid circulation groove and finished acid tank, on described blow-down pipe, correspondence is provided with tensimeter.
4. the control of nitrogen peroxide content according to claim 1 and recovery system, it is characterized in that: described diluted acid circulation groove contains the water coolant tubulation.
5. the control of nitrogen peroxide content according to claim 1 and 2 and recovery system, it is characterized in that: the top hole pressure of diluted acid recycle pump is 0.6～0.8MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210314824.7A CN102807197B (en) | 2012-08-30 | 2012-08-30 | Control and recovery system for nitrogen dioxide content |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210314824.7A CN102807197B (en) | 2012-08-30 | 2012-08-30 | Control and recovery system for nitrogen dioxide content |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102807197A CN102807197A (en) | 2012-12-05 |
| CN102807197B true CN102807197B (en) | 2014-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210314824.7A Expired - Fee Related CN102807197B (en) | 2012-08-30 | 2012-08-30 | Control and recovery system for nitrogen dioxide content |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105013382B (en) * | 2015-07-09 | 2017-05-10 | 安徽淮化股份有限公司 | Device for bleaching nitric acid solution through urea method and preparation method therefor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101428774A (en) * | 2008-11-25 | 2009-05-13 | 陈淮银 | Method for continuously dilution diluting aqua fortis and controlling generation of NO2 |
| CN101955168A (en) * | 2010-09-29 | 2011-01-26 | 上海化学试剂研究所 | Method for removing nitrogen dioxide in rectifying process of nitric acid solution |
| CN202785658U (en) * | 2012-08-30 | 2013-03-13 | 安徽淮化股份有限公司 | System for controlling content of nitrogen dioxide and recovering nitrogen dioxide |
-
2012
- 2012-08-30 CN CN201210314824.7A patent/CN102807197B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101428774A (en) * | 2008-11-25 | 2009-05-13 | 陈淮银 | Method for continuously dilution diluting aqua fortis and controlling generation of NO2 |
| CN101955168A (en) * | 2010-09-29 | 2011-01-26 | 上海化学试剂研究所 | Method for removing nitrogen dioxide in rectifying process of nitric acid solution |
| CN202785658U (en) * | 2012-08-30 | 2013-03-13 | 安徽淮化股份有限公司 | System for controlling content of nitrogen dioxide and recovering nitrogen dioxide |
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|---|---|
| CN102807197A (en) | 2012-12-05 |
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Effective date of registration: 20210413 Address after: 234000 No. 157, Xichang Road, Suzhou, Anhui Patentee after: WANBEI COAL-ELECTRICITY GROUP Co.,Ltd. Address before: 232038 Anhui Province, Huainan city tianjia'an District Quanshan Patentee before: ANHUI HUAIHUA Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20140108 Termination date: 20210830 |