CN104964514A - Nitrous oxide low-temperature recycling system and method - Google Patents
Nitrous oxide low-temperature recycling system and method Download PDFInfo
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- CN104964514A CN104964514A CN201510401311.3A CN201510401311A CN104964514A CN 104964514 A CN104964514 A CN 104964514A CN 201510401311 A CN201510401311 A CN 201510401311A CN 104964514 A CN104964514 A CN 104964514A
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Abstract
The invention relates to a nitrous oxide low-temperature recycling system and method. Main devices include a main heat exchanger, a condenser, a fractionating tower, a separator, an expansion machine and a nitrogen circulation compressor. Single-tower low-temperature fractionation is adopted, and a liquid nitrous oxide product with the purity higher than 99.999% can be obtained; in addition, waste gas obtained by separating raw material gas is used for supplementing the nitrogen circulation compressor to manufacture a refrigerating medium, the refrigerating medium does not need to be specially purchased, expansion refrigeration is achieved through an expansion machine, the nitrous oxide low-temperature recycling system and method are economical and applicable, operation is easy, load varying is more flexible, and the nitrous oxide low-temperature recycling system and method are suitable for small or large nitrous oxide purifying and separating devices.
Description
Technical field
The present invention relates to gas separaion field, particularly a kind of nitrous oxide low temperature recovery system and recovery method.
Background technology
Nitric acid, hexanedioic acid are all important industrial chemicals, a large amount of oxides of nitrogen gas tail gas is produced in production, pretreated tail gas Main Ingredients and Appearance is nitrogen and nitrous oxide, nitrous oxide gas damages one of gas the most serious to earth atmosphere, it can cause the destruction of greenhouse effects and ozone layer, and direct discharge can cause serious environmental problem.The catalytic reduction method of usual employing complexity is decomposed into harmless nitrogen and oxygen discharges.
Nitrous oxide has important application, may be used for the fuel and rocket oxidizer etc. of electronics industry, racing car accelerating system, certain method can be adopted the nitrous oxide in its tail gas to be carried out purification reclaim, not only reduce environmental pollution, also bring very large economic benefit.
Application number is 201310308364.1, name is called a kind of for reclaiming and being oxidized the Chinese patent of the system of argon nitrogen in purifying industrial tail gas, provide a kind of recovery purifying technique to nitrous oxide, but separating-purifying operation has the following disadvantages: adopt two stage rectification tower to be separated, complicated operation; Rectifying column condenser adopts anti-icing fluid easily to cause secondary pollution as condensing agent, and condensation effect is undesirable, and maximizing in addition to consume a large amount of condensing agents, is not suitable for large-scale separator.
Summary of the invention
The object of the invention is to overcome nitrous oxide low temperature recovery system and recovery method that above-mentioned deficiency of the prior art provides a kind of structural manufacturing process simple, safe and reliable.
Technical scheme of the present invention is achieved in that a kind of nitrous oxide low temperature recovery system, mainly comprise: low-temperature liquefaction is separated ice chest and nitrogen circulation compressor, it is characterized in that: described low-temperature liquefaction is separated that ice chest comprises main heat exchanger, condenser, rectifying column, separator squeeze decompressor; Described rectifying column comprises tower body and reboiler; Described main heat exchanger, rectifying column, condenser and separator are connected successively; Described nitrogen circulation compressor, cooler, reboiler, main heat exchanger, decompressor and condenser are connected successively, form nitrogen circulation loop.
Described main heat exchanger, condenser and reboiler are vacuum brazing aluminum plate-fin heat exchanger; Described rectifying column is packed tower or plate column; Described decompressor is gas axle decompressor or oily axle decompressor; Described nitrogen compressor is piston machine or centrifuge.
A kind of nitrous oxide low temperature recovery method, comprises the steps:
Unstripped gas after purification enters main heat exchanger and is cooled to uniform temperature, enter described rectifying column and carry out rectifying separation, highly purified nitrous oxide product is obtained at the bottom of rectifying tower, rectifying tower top gaseous body enters condenser condenses and enters gas-liquid separator to uniform temperature, liquid phase backflows rectifying column tower top as phegma, gas-liquid separator gas phase backflow condenser, main heat exchanger re-heat go out liquefaction be separated ice chest;
Described nitrogen circulation compressor, nitrogen is compressed to the certain pressure device cooling that is cooled through described nitrogen compressor and enters rectifying column reboiler and provide heat, enter described main heat exchanger after cooling and be cooled to uniform temperature, then enter described decompressor and carry out swell refrigeration, enter condenser after expansion and cold re-heat is provided, then enter described main heat exchanger re-heat and go out liquefaction separation ice chest, enter nitrogen circulation suction port of compressor and form nitrogen circulation loop.
Nitrogen compressor compressed media is that pure nitrogen gas or unstripped gas are separated waste gas.
Described nitrogen circulation compressor delivery pressure is: 0.6 ~ 1.0MPa; Described outlet pressure of expansion machine is 0.2 ~ 0.25MPa, and unstripped gas, nitrogen are all cooled to-50 DEG C ~-60 DEG C by described main heat exchanger.
The good effect that technical scheme of the present invention produces is as follows: utilize the purification of single column cryogenic rectification separation method to reclaim the industrial tail gas being rich in nitrous oxide, equipment is few, automaticity is high, the liquid nitrous oxide product that purity is greater than 99.999% can be obtained, not only efficiently solve nitrous oxide exhaust emissions and the environmental problem caused, but also bring certain economic benefit.
Cancel anti-icing fluid as condensing agent, can effectively prevent condensing agent from causing secondary pollution, utilize unstripped gas to be separated the waste gas obtained to supplement nitrogen circulation compressor and make refrigerant, do not need special outsourcing refrigerant, expander refrigeration is adopted to provide cold, good refrigeration effect, economic and practical, simple to operate, varying duty is more flexible, is suitable for small-sized or large-scale nitrous oxide purification & isolation device.
Aluminum plate-fin heat exchanger belongs to dividing wall type compact heat exchanger, good effect of heat exchange, and heat exchanger volume is little; The plate Shu Caiyong vacuum brazing technique of plate-fin heat exchanger, guarantee that fin, dividing plate and strip of paper used for sealing fuse into entirety, can not produce leakage, security is high.
Accompanying drawing explanation
Fig. 1 is the structural representation of nitrous oxide low temperature recovery system of the present invention.
Be labeled as in figure: 1, ice chest; 2, rectifying column; 3, main heat exchanger; 4, condenser; 5, separator; 6, decompressor; 7, nitrogen circulation compressor; 8, reboiler; 9, compressor aftercooler.
Detailed description of the invention
Embodiment one
A kind of nitrous oxide low temperature recovery system, as shown in Figure 1, capital equipment is that low-temperature liquefaction is separated ice chest 1 and nitrogen circulation compressor 7, and described low-temperature liquefaction is separated ice chest 1 and comprises main heat exchanger 3, condenser 4, rectifying column 2, separator 5, decompressor 6; Described rectifying column 2 comprises tower body and reboiler 8.Described main heat exchanger 3, rectifying column 2, condenser 4, separator 5 are connected successively; Described nitrogen circulation compressor 7, compressor aftercooler 9, reboiler 8, main heat exchanger 3, decompressor 6, condenser 4 connect successively, form nitrogen circulation loop.
Described main heat exchanger 3, condenser 4 and reboiler 8 are vacuum brazing aluminum plate-fin heat exchanger; Described rectifying column 2 is packed tower or plate column; Described decompressor 6 is gas axle decompressor or oily axle decompressor; Described nitrogen compressor 7 is piston machine or centrifuge.
Embodiment two
A kind of nitrous oxide low temperature recovery method, comprise the following steps: pretreated nitrous oxide-containing unstripped gas enters main heat exchanger 3 and is cooled to-50 DEG C ~-60 DEG C, enter described rectifying column 2 and carry out rectifying separation, the nitrous oxide product that purity is greater than 99.999% is obtained at the bottom of rectifying column 2 tower, fluid product sends liquefaction ice chest 1, tower bottom reboiler evaporation side temperature is-15 DEG C ~-25 DEG C, the gas bleeding of rectifying column 2 tower top enters condenser 4 and is condensed to-80 DEG C ~-88 DEG C and enters vapour liquid separator 5, liquid phase backflows rectifying column 2 tower top as phegma, separator gas phase is backflowed condenser 4, main heat exchanger 3 re-heat goes out liquefaction and is separated ice chest 1, after re-heat, gas phase can as the supplementary refrigerant of nitrogen circulation compressor 7.
Described nitrogen circulation compressor 7, nitrogen is compressed to 0.6 ~ 1.0MPa through described nitrogen compressor 7 and enters compressor aftercooler 9 and be cooled to 40 DEG C and enter rectifying column reboiler 8 and provide heat, be cooled to 26 DEG C ~ 30 DEG C, enter described main heat exchanger 3 after cooling and be cooled to-50 DEG C ~-60 DEG C, enter described decompressor 6 and carry out swell refrigeration, be expanded to 0.2 ~ 0.25MPa, temperature is-85 DEG C ~-90 DEG C, enter condenser 4 after expansion and cold re-heat is provided, then enter described main heat exchanger 3 re-heat and go out liquefaction separation ice chest 1, enter recycle compressor 7 and enter interruption-forming nitrogen circulation loop.
Claims (5)
1. a nitrous oxide low temperature recovery system, mainly comprises: low-temperature liquefaction is separated ice chest and nitrogen circulation compressor, it is characterized in that: described low-temperature liquefaction is separated that ice chest comprises main heat exchanger, condenser, rectifying column, separator squeeze decompressor; Described rectifying column comprises tower body and reboiler; Described main heat exchanger, rectifying column, condenser and separator are connected successively; Described nitrogen circulation compressor, cooler, reboiler, main heat exchanger, decompressor and condenser are connected successively, form nitrogen circulation loop.
2. a kind of nitrous oxide low temperature recovery system according to claim 1, is characterized in that: described main heat exchanger, condenser and reboiler are vacuum brazing aluminum plate-fin heat exchanger; Described rectifying column is packed tower or plate column; Described decompressor is gas axle decompressor or oily axle decompressor; Described nitrogen compressor is piston machine or centrifuge.
3. a recovery method for nitrous oxide low temperature recovery system as described in claim 1, comprises the steps:
Unstripped gas after purification enters main heat exchanger and is cooled to uniform temperature, enter described rectifying column and carry out rectifying separation, highly purified nitrous oxide product is obtained at the bottom of rectifying tower, rectifying tower top gaseous body enters condenser condenses and enters gas-liquid separator to uniform temperature, liquid phase backflows rectifying column tower top as phegma, gas-liquid separator gas phase backflow condenser, main heat exchanger re-heat go out liquefaction be separated ice chest;
Described nitrogen circulation compressor, nitrogen is compressed to the certain pressure device cooling that is cooled through described nitrogen compressor and enters rectifying column reboiler and provide heat, enter described main heat exchanger after cooling and be cooled to uniform temperature, then enter described decompressor and carry out swell refrigeration, enter condenser after expansion and cold re-heat is provided, then enter described main heat exchanger re-heat and go out liquefaction separation ice chest, enter nitrogen circulation suction port of compressor and form nitrogen circulation loop.
4. the recovery method of a kind of nitrous oxide low temperature recovery system according to claim 3, is characterized in that: nitrogen compressor compressed media is that pure nitrogen gas or unstripped gas are separated waste gas.
5. the recovery method of a kind of nitrous oxide low temperature recovery system according to claim 3, is characterized in that: described nitrogen circulation compressor delivery pressure is: 0.6 ~ 1.0MPa; Described outlet pressure of expansion machine is 0.2 ~ 0.25MPa, and unstripped gas, nitrogen are all cooled to-50 DEG C ~-60 DEG C by described main heat exchanger.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105783422A (en) * | 2016-04-27 | 2016-07-20 | 北京中科瑞奥能源科技股份有限公司 | Method and system for producing liquid-state laughing gas with adipic acid tail gas |
| CN108224900A (en) * | 2018-01-24 | 2018-06-29 | 北京拓首能源科技股份有限公司 | A kind of oxygen nitrogen and argon piece-rate system using cold energy of liquefied natural gas |
| CN110645769A (en) * | 2019-09-22 | 2020-01-03 | 浙江智海化工设备工程有限公司 | Nitrous oxide low-temperature recovery method |
| CN110835101A (en) * | 2019-10-24 | 2020-02-25 | 河南神马尼龙化工有限责任公司 | Device and method for recovering electronic-grade nitrous oxide from industrial tail gas |
| CN116518647A (en) * | 2023-04-11 | 2023-08-01 | 英德市西洲气体有限公司 | Device and method for removing nitrous oxide from nitric oxide gas |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105783422A (en) * | 2016-04-27 | 2016-07-20 | 北京中科瑞奥能源科技股份有限公司 | Method and system for producing liquid-state laughing gas with adipic acid tail gas |
| CN108224900A (en) * | 2018-01-24 | 2018-06-29 | 北京拓首能源科技股份有限公司 | A kind of oxygen nitrogen and argon piece-rate system using cold energy of liquefied natural gas |
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| CN110645769A (en) * | 2019-09-22 | 2020-01-03 | 浙江智海化工设备工程有限公司 | Nitrous oxide low-temperature recovery method |
| CN110835101A (en) * | 2019-10-24 | 2020-02-25 | 河南神马尼龙化工有限责任公司 | Device and method for recovering electronic-grade nitrous oxide from industrial tail gas |
| CN110835101B (en) * | 2019-10-24 | 2023-01-31 | 河南神马尼龙化工有限责任公司 | Device and method for recovering electronic-grade nitrous oxide from industrial tail gas |
| CN116518647A (en) * | 2023-04-11 | 2023-08-01 | 英德市西洲气体有限公司 | Device and method for removing nitrous oxide from nitric oxide gas |
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Application publication date: 20151007 |