CN103691287A - Nitrogen tetroxide tail gas recycling system - Google Patents
Nitrogen tetroxide tail gas recycling system Download PDFInfo
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- CN103691287A CN103691287A CN201310735030.2A CN201310735030A CN103691287A CN 103691287 A CN103691287 A CN 103691287A CN 201310735030 A CN201310735030 A CN 201310735030A CN 103691287 A CN103691287 A CN 103691287A
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- tail gas
- absorption tower
- dinitrogen tetroxide
- recycling system
- blender
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Abstract
The invention provides a nitrogen tetroxide tail gas recycling system which comprises a receiver for receiving and conveying nitrogen tetroxide, wherein an exhaust end at the top end of the receiver is connected with a gas inlet end of a blender through an exhaust pipe, an air pipe and a nitrogen tetroxide tail gas pipe used for conveying the tail gas in nitrogen tetroxide production equipment are respectively connected on the blender, a gas outlet end of the blender is connected with a gas inlet end at the bottom of an absorption tower, a spraying water pipe is connected at the top end of the absorption tower, and a liquid outlet end at the bottom end of the absorption tower is connected with an acid storage tank. The nitrogen tetroxide tail gas recycling system fully uses a N2O4 production device and the N2O4 tail gas not completely utilized during loading and unloading and transferring, water and air are added to react sufficiently to produce dilute nitric acids the concentration of which is smaller than 68% and which meet different concentration requirements, in addition, the content of NO2 in the air is lower than 200PPM and reaches the emission standard, the purposes of saving energies and protecting environments are fulfilled, and the production cost is saved.
Description
Technical field
The present invention relates to dinitrogen tetroxide technical field, be specifically related to the recycling system of dinitrogen tetroxide tail gas in a kind of production process.
Background technology
Dinitrogen tetroxide, molecular formula is N
2o
4, colourless gas, strong oxidizer, boiling point is 21.5 ℃, is liquid at this temperature.The density of liquid dinitrogen tetroxide is 1443kg/m
3; , can with many fuel spontaneous combustions, be a kind of good oxidant.Along with industrial expansion, the application of liquid dinitrogen tetroxide is more and more extensive, is one of very important propellant at present.But because dinitrogen tetroxide boiling point is low, be only 21.5 ℃, colourless dinitrogen tetroxide also can change dark-brown NO at normal temperatures
2, its reaction equation is N
2o
4=2NO
2therefore, in handling in process of production of dinitrogen tetroxide, conversion, there is part to change titanium dioxide phenodiazine into and by leakage, discharged together, can not be utilized completely fully.Because dinitrogen tetroxide and these two kinds of materials of nitrogen dioxide are all hypertoxic product, be discharged into air and cause environmental pollution, also can damage human body, biology; Also cause the rising of the wasting of resources and its production cost simultaneously.
In addition, nitric acid is of many uses, production capacity is larger, in its process units, mainly adopt ammonia in the situation that noble metal catalyst exists with airborne oxygen generation oxidation reaction (4NH
3+ 5O
2=4NO+6H
2o+Q), the nitric oxide of generation through anhydrating, the operation such as cooling enters after turbocompressor, then be sent to oxidator and be further oxidized (2NO+O
2=2NO
2), enter absorption tower after cooling and produce nitric acid.Its production process relates to the use of raw material ammonia and noble metal catalyst, and its cost is larger.
?
Summary of the invention
The object of the present invention is to provide the recycling system of dinitrogen tetroxide tail gas in a kind of production process, utilize dinitrogen tetroxide in situation, to add air and the rare nitric acid of aquatic output under normal pressure, turn waste into wealth, and reduce the pollution to environment.
The present invention has adopted following technical scheme: a kind of recycling system of dinitrogen tetroxide tail gas, comprise for receiving and the receiver of carrying dinitrogen tetroxide, described receiver top exhaust end is connected with the inlet end of blender by blast pipe, on described blender, be connected with respectively air hose with for delivery of the dinitrogen tetroxide offgas duct of tail gas in dinitrogen tetroxide production equipment; The outlet side of described blender is connected with the inlet end of bottom, absorption tower, and top, described absorption tower is connected with spray header; Bottom, described absorption tower outlet end is connected with storage acid tank.
Further, the port of export of described storage acid tank is connected with recirculation cooler by circulating pump, and the port of export of described recirculation cooler is connected with the middle part on described absorption tower.
Further, the port of export of described recirculation cooler is connected with the top on described absorption tower by condenser; Described spray header is provided with by-pass valve control.
Further, between described circulating pump and recirculation cooler, be provided with acid delivering tube.
Further, described absorption tower pressure is 0-0.3MPa, and column bottom temperature is that 30-70 ℃, top of tower temperature are 10-30 ℃.
Further, described condenser is chilled brine heat exchanger, and its temperature is-10～-14 ℃.
The present invention utilizes dinitrogen tetroxide tail gas in situation, to add air and water in absorption tower, to produce rare nitric acid under normal pressure, and its reaction equation is:
N
2o
4=2NO
2(reversible reaction)
3NO
2＋H
2O=2HNO
3＋NO
2NO＋O
2=2NO
2
Can produce the salpeter solution of variable concentrations, if raising acid concentration, make to store up rare nitric acid in acid tank and by circulating pump, enter the middle part of carrying out entering after heat exchange absorption tower in recirculation cooler and spray, make titanium dioxide oxygen continue to continue to react generation nitric acid, i.e. 3NO with the water in dilute nitric acid solution
2+ H
2o=2HNO
3+ NO.Oxygen reaction in the NO of simultaneous reactions output and air: 2NO+O
2=2NO
2the NO that reaction produces
2continue to react with water the rare nitric acid of generation.
If further improve the concentration of nitric acid, close valve on spray header and stop adding water, the rare nitric acid that makes to store up in acid tank is entered in recirculation cooler and is carried out after heat exchange by circulating pump, enter again further heat exchange in condenser, then entering top, absorption tower sprays, make the water in dilute nitric acid solution further react generation nitric acid, i.e. 2H with titanium dioxide oxygen
2o+2N
2o
4+ O
2=4HNO
3thereby, reach the object that improves its concentration.
So by above-mentioned several steps, operate, can production concentration rare nitric acid below 68%.
Beneficial effect of the present invention has:
1, at N
2o
4in process units, rationally reclaim the N that its handling, conversion etc. can not be utilized completely
2o
4, by adding water, air fully reacts, and by the circulation of rare nitric acid, can produce rare nitric acid of the various concentration of concentration below 68%, turn waste into wealth, and reduce the pollution to environment.
2, reaction oxygen provides for compressed air, simple; Because NO utilization rate is high, reaction is thorough, NO in the gas of absorption tower jacking row emptying simultaneously
2content is lower than 200PPM.Therefore energy qualified discharge of the present invention, plays energy-conserving and environment-protective and cost-saving effect.
3, by air, receiver top discharge and production process in the dinitrogen tetroxide tail gas that produces all lead in blender and mix, thereby it is even to reach each component.
4, owing to producing dilute nitric acid reaction, be strong exothermal reaction, the present invention removes reaction heat by temperature in recirculated water, condenser in recirculation cooler for the chilled brine of-10～-14 ℃ respectively and promotes reaction to carry out.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1-receiver, 2-blender, 3-absorption tower, 4-stores up acid tank, 5-circulating pump, 6-recirculation cooler, 7-condenser, 8-1 acid delivering tube, 8-2 blast pipe, 8-3 dinitrogen tetroxide offgas duct, 8-4 air hose, 8-5 spray header.
The specific embodiment
Below in conjunction with accompanying drawing, be described in further detail:
As shown in Figure 1, a kind of recycling system of dinitrogen tetroxide tail gas, comprise for receiving and the receiver 1 of carrying dinitrogen tetroxide, described receiver 1 top exhaust end is connected with the inlet end of blender 2 by blast pipe 8-2, on described blender 2, be connected with respectively air hose 8-4 with for delivery of the dinitrogen tetroxide offgas duct 8-3 of tail gas in dinitrogen tetroxide production equipment; The outlet side of described blender 2 is connected with the inlet end of 3 bottoms, absorption tower, and 3 tops, described absorption tower are connected with spray header 8-5; Described absorption tower 3 bottom outlet ends are connected with storage acid tank 4.Between described circulating pump 5 and recirculation cooler 6, be provided with acid delivering tube 8-1, the rare nitric acid of finished product is entrucked and carried away by acid delivering tube 8-1; Absorption tower 3 pressure are 0-0.3MPa, and column bottom temperature is that 30-70 ℃, top of tower temperature are 10-30 ℃.
Further, in order to improve the concentration of rare nitric acid, the port of export of described storage acid tank 4 is connected with recirculation cooler 6 by circulating pump 5, and the port of export of described recirculation cooler 6 is connected and sprays with the middle part on absorption tower 3, further generates nitric acid.
Further, for further improving the concentration of rare nitric acid, the port of export of described recirculation cooler 6 is connected with the top on described absorption tower 3 by condenser 7; Described spray header 8-5 is provided with by-pass valve control, close spray header 8-5, making to store up rare nitric acid in acid tank 4 imports in recirculation cooler 6 and carries out heat exchange through circulating pump 5, enter again in condenser 7 after further heat exchange cooling, from absorption tower, 3 top sprays, reaction is further carried out, and improved the concentration of nitric acid.Wherein condenser 7 is chilled brine heat exchanger, and its temperature is-10～-14 ℃.
The dinitrogen tetroxide tail gas that dinitrogen tetroxide by air in air hose 8-4, receiver 1 produces from the blast pipe 8-2 at its top and production process is after dinitrogen tetroxide offgas duct 8-3 passes into and mixes blender 2, pass into again in absorption tower 3, from absorption tower the spray header 8-5 at 3 tops to absorption tower 3 interior shower waters, thereby in absorption tower 3, produce rare nitric acid.And can produce rare nitric acid of the various concentration of concentration below 68% by the circulation of rare nitric acid, production process is discharged into airborne dinitrogen tetroxide to turn waste into wealth, and reduces the pollution to environment.
Above embodiment is not limited only to protection scope of the present invention, all based on basic thought of the present invention, modify or change all belong to protection scope of the present invention.
Claims (6)
1. the recycling system of a dinitrogen tetroxide tail gas, comprise for receiving and the receiver of carrying dinitrogen tetroxide (1), it is characterized in that: described receiver (1) top exhaust end is connected with the inlet end of blender (2) by blast pipe (8-2), on described blender (2), be connected with respectively air hose (8-4) and for delivery of the dinitrogen tetroxide offgas duct (8-3) of tail gas in dinitrogen tetroxide production equipment; The outlet side of described blender (2) is connected with the inlet end of absorption tower (3) bottom, and top, described absorption tower (3) is connected with spray header (8-5); Bottom, described absorption tower (3) outlet end is connected with storage acid tank (4).
2. the recycling system of dinitrogen tetroxide tail gas according to claim 1, it is characterized in that: the port of export of described storage acid tank (4) is connected with recirculation cooler (6) by circulating pump (5), and the port of export of described recirculation cooler (6) is connected with the middle part of described absorption tower (3).
3. the recycling system of dinitrogen tetroxide tail gas according to claim 2, is characterized in that: the port of export of described recirculation cooler (6) is connected with the top of described absorption tower (3) by condenser (7); Described spray header (8-5) is provided with by-pass valve control.
4. according to the recycling system of the dinitrogen tetroxide tail gas described in claim 1-3 any one, it is characterized in that: between described circulating pump (5) and recirculation cooler (6), be provided with acid delivering tube (8-1).
5. according to the recycling system of the dinitrogen tetroxide tail gas described in claim 1-3 any one, it is characterized in that: described absorption tower (3) pressure is 0-0.3MPa, column bottom temperature is that 30-70 ℃, top of tower temperature are 10-30 ℃.
6. the recycling system of dinitrogen tetroxide tail gas according to claim 3, is characterized in that: described condenser (7) is chilled brine heat exchanger, and its temperature is-10～-14 ℃.
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|---|---|---|---|
| CN201310735030.2A CN103691287B (en) | 2013-12-27 | 2013-12-27 | A kind of recycling system of dinitrogen tetroxide tail gas |
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|---|---|---|---|
| CN201310735030.2A CN103691287B (en) | 2013-12-27 | 2013-12-27 | A kind of recycling system of dinitrogen tetroxide tail gas |
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| CN103691287A true CN103691287A (en) | 2014-04-02 |
| CN103691287B CN103691287B (en) | 2016-01-20 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103920385A (en) * | 2014-04-25 | 2014-07-16 | 兰州大学 | Oxidation absorption method for converting high-concentration dinitrogen tetroxide waste gas into potassium fertilizer |
| CN106145071A (en) * | 2015-04-03 | 2016-11-23 | 北京航天试验技术研究所 | A kind of dinitrogen tetroxide spent liquor processing means and method for treating waste liquid thereof |
| CN107998806A (en) * | 2016-10-28 | 2018-05-08 | 北京航天试验技术研究所 | A kind of dinitrogen tetroxide leakage collecting device and its collection method |
| CN109665504A (en) * | 2017-10-17 | 2019-04-23 | 贵州芭田生态工程有限公司 | Dilute nitric acid production device |
| CN110813032A (en) * | 2019-09-28 | 2020-02-21 | 中国人民解放军63605部队 | Intelligent self-regulation and control absorption device for dinitrogen tetroxide waste liquid |
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| JP2012121745A (en) * | 2010-12-07 | 2012-06-28 | Sumitomo Metal Mining Co Ltd | Recovery method for nitrogen monoxide gas and recovery device for nitrogen monoxide gas |
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2013
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Patent Citations (6)
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| US4081517A (en) * | 1975-03-13 | 1978-03-28 | Chenoweth Development Laboratories, Inc. | Nitrogen oxide conversion process |
| US5167935A (en) * | 1989-01-26 | 1992-12-01 | Beco Engineering Company | Apparatus for treatment of nitrogen oxides |
| CN1173462A (en) * | 1996-05-23 | 1998-02-18 | 普拉塞尔技术有限公司 | Direct oxygen infection in nitric acid production |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103920385A (en) * | 2014-04-25 | 2014-07-16 | 兰州大学 | Oxidation absorption method for converting high-concentration dinitrogen tetroxide waste gas into potassium fertilizer |
| CN103920385B (en) * | 2014-04-25 | 2016-04-06 | 兰州大学 | A kind of is the oxidative absorption method of potash fertilizer by high concentration dinitrogen tetroxide exhaust gas conversion |
| CN106145071A (en) * | 2015-04-03 | 2016-11-23 | 北京航天试验技术研究所 | A kind of dinitrogen tetroxide spent liquor processing means and method for treating waste liquid thereof |
| CN107998806A (en) * | 2016-10-28 | 2018-05-08 | 北京航天试验技术研究所 | A kind of dinitrogen tetroxide leakage collecting device and its collection method |
| CN109665504A (en) * | 2017-10-17 | 2019-04-23 | 贵州芭田生态工程有限公司 | Dilute nitric acid production device |
| CN110813032A (en) * | 2019-09-28 | 2020-02-21 | 中国人民解放军63605部队 | Intelligent self-regulation and control absorption device for dinitrogen tetroxide waste liquid |
| CN110813032B (en) * | 2019-09-28 | 2022-05-27 | 中国人民解放军63605部队 | Intelligent self-regulation and control absorption device for dinitrogen tetroxide waste liquid |
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|---|---|
| CN103691287B (en) | 2016-01-20 |
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