CN107539967B - System for improving purification and separation stability and argon extraction rate of synthesis ammonia purge gas - Google Patents
System for improving purification and separation stability and argon extraction rate of synthesis ammonia purge gas Download PDFInfo
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- CN107539967B CN107539967B CN201710824037.XA CN201710824037A CN107539967B CN 107539967 B CN107539967 B CN 107539967B CN 201710824037 A CN201710824037 A CN 201710824037A CN 107539967 B CN107539967 B CN 107539967B
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- adsorption
- deamination
- valve
- rectification
- outlet
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- 239000007789 gas Substances 0.000 title claims abstract description 67
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 title claims abstract description 58
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910052786 argon Inorganic materials 0.000 title claims abstract description 29
- 238000010926 purge Methods 0.000 title claims abstract description 21
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 18
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 17
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 17
- 238000000746 purification Methods 0.000 title claims abstract description 16
- 238000000926 separation method Methods 0.000 title claims abstract description 16
- 238000000605 extraction Methods 0.000 title claims abstract description 14
- 238000001179 sorption measurement Methods 0.000 claims abstract description 77
- 230000009615 deamination Effects 0.000 claims abstract description 44
- 238000006481 deamination reaction Methods 0.000 claims abstract description 44
- 239000007788 liquid Substances 0.000 claims abstract description 19
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 48
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000007664 blowing Methods 0.000 claims description 12
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 11
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 10
- 230000008929 regeneration Effects 0.000 claims description 8
- 238000011069 regeneration method Methods 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 239000002699 waste material Substances 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000002912 waste gas Substances 0.000 claims description 3
- 238000006392 deoxygenation reaction Methods 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000003463 adsorbent Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000005262 decarbonization Methods 0.000 description 3
- 230000006837 decompression Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001868 water Inorganic materials 0.000 description 1
Landscapes
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention provides a system for improving purification and separation stability and argon extraction rate of synthesis ammonia purge gas, which comprises a deamination adsorption system, a rectification system, a buffer tank, a compressor, a first valve and a second valve, wherein an air inlet of the deamination adsorption system is connected to raw gas, and an air outlet of the deamination adsorption system is connected to the rectification system through an exhaust main pipeline; be equipped with buffer tube branch road on the exhaust trunk line, connect gradually first valve, compressor on the buffer tube branch road, the compressor is connected to the inlet end of buffer tank, the end of giving vent to anger of buffer tank is connected to the buffer tube branch road between first valve and the exhaust trunk line through the pipeline of taking the second valve. The invention can not only greatly reduce the whole energy consumption of the system due to the stable extraction of liquid argon, but also greatly reduce the operation intensity of personnel, and the personnel does not need to adjust the rectification system with effort when the deamination adsorption system is switched.
Description
Technical Field
The invention relates to a system for improving purification and separation stability and argon extraction rate of synthesis ammonia purge gas.
Background
The purification and separation system for the synthesis ammonia purge gas separates valuable components in the synthesis ammonia purge gas through a series of impurity removal and optimized low-temperature rectification processes to obtain hydrogen, liquid methane, liquid argon and liquid nitrogen products.
The deamination decarbonization system adopts a three-cylinder adsorption switching process (hereinafter referred to as deamination adsorption system), wherein the first adsorption cylinder is in an adsorption state, the second adsorption cylinder is in a cold blowing state, and the third adsorption cylinder is in a heating regeneration state. The air source needed by heating regeneration is from the cold blowing air of the upper cylinder (the cold blowing regenerated air is from the waste nitrogen of the fractionating tower), so that the regenerated air amount is small, and the energy consumption is low. The regenerated gas is subjected to ammonia water washing to remove the resolved ammonia gas, so that the direct exhaust of the amplified gas is avoided, and the diluted ammonia water is returned to chemical plant chemical equipment. The deamination decarbonization system is also provided with a decompression recovery system, and the decompression gas in the adsorption cylinder is pressurized and then is sent into the inlet, so that waste is avoided. And (3) the tail gas after the deamination and decarbonization system enters a rectification system, and products of hydrogen, liquid methane, liquid argon and liquid nitrogen are finally obtained through a series of low-temperature purification and separation in the rectification system.
The deamination adsorption system is one of core equipment in the synthesis ammonia purge gas purification and separation system, wherein the adsorbent is used for adsorbing ammonia, water and carbon dioxide in the synthesis ammonia purge gas, and methane in the purge gas is a beneficial component of the system and occupies a relatively high proportion, but the adsorbent has a certain adsorption effect on methane. When the adsorption barrel adsorbs the methane which is a beneficial component in the purge gas in the initial stage of saturation switching, the methane content in the adsorbed gas is reduced due to the fact that the adsorbent adsorbs the methane which is a beneficial component in the purge gas, the influence of the change of the flow and the components on a subsequent rectification system is great, the precise rectification process is damaged by the fluctuation of the rapid reduction of the flow, and the liquid level at the bottom of the rectification tower is fluctuated due to the reduction of the methane content. The argon extracting process in the rectification system needs fine operation, the fluctuation of the rectification process greatly influences the argon extracting process, and the deamination adsorption system needs frequent switching, so that the system cannot operate the argon extracting of the system, a large amount of argon-rich gas is emptied by white air, the argon content in methane is increased, and the purity of the methane is reduced.
In a word, because methane in purge gas is adsorbed in the switching initial stage of the deamination adsorption system, the frequent occurrence of the rectification system is influenced, so that the system cannot normally produce liquid argon, and the purity of methane is reduced.
Disclosure of Invention
The invention provides a system for improving purification and separation stability and argon extraction rate of synthesis ammonia purge gas, which solves the problem that a rectification system is affected when a deamination adsorption system is frequently switched. Not only can the whole energy consumption of the system be greatly reduced due to the fact that the liquid argon can be stabilized, but also the operation intensity of personnel can be greatly reduced, and the personnel do not need to adjust the rectification system with effort when the deamination adsorption system is switched. In addition, the project research can also improve the purity of the product methane, thereby improving the market competitiveness of the methane.
The technical scheme of the invention is realized as follows:
the system for improving purification and separation stability and argon extraction rate of the synthesis ammonia purge gas comprises a deamination adsorption system 1, a rectification system 3, a buffer tank 6, a compressor 5, a first valve 7 and a second valve 8, wherein an air inlet of the deamination adsorption system 1 is connected to raw gas, and an air outlet is connected to the rectification system 3 through an exhaust main pipeline 2; be equipped with buffer tube branch road 17 on the exhaust trunk line 2, connect gradually first valve 7, compressor 5 on the buffer tube branch road 17, compressor 5 is connected to the inlet end of buffer tank 6, the end of giving vent to anger of buffer tank 6 is connected to the buffer tube branch road 17 between first valve 7 and the exhaust trunk line 2 through the pipeline of taking second valve 8.
Preferably, the pressure release gas outlet of the deamination adsorption system 1 is further connected to a pressure release gas recovery system 20, and the pressure release gas recovery system 20 is connected to the gas inlet of the deamination adsorption system 1.
Preferably, the deamination adsorption system 1 is further provided with a water ammonia system, which is connected to an ammonia water user 19 through an ammonia water pipe 14.
Preferably, the off-gas discharge of the deamination adsorption system 1 is connected via a first flare, dispersion line 13 to a common discharge line 16, said common discharge line 16 being connected to a user discharge line end 18.
Preferably, the deamination adsorption system 1 is of a three-cylinder adsorption structure, and sequentially comprises an adsorption cylinder, a cold blowing adsorption cylinder and a heating regeneration adsorption cylinder, and a waste nitrogen outlet of the rectification system 3 is connected to the deamination adsorption system 1 to be a cold blowing adsorption cylinder air source through a cold blowing regeneration air pipeline 4.
Preferably, the liquid argon outlet of the rectification system 3 is connected to a liquid argon deoxygenation system 9, and the liquid hydrogen outlet of the rectification system 3 is connected to H 2 A purifier 10, the methane outlet of the rectification system 3 is connected to an LNG storage tank 11, and the LNG storage tank 11 is connected to an LNG filling system 12.
Preferably, the off-gas outlet of the rectification system 3 is connected via a second flare, dispersion conduit 15 to a common discharge conduit 16, the common discharge conduit 16 being connected to a user discharge conduit end 18.
The beneficial effects of the invention are as follows: for the reduction of the gas quantity after switching, a compressor is added and a buffer tank is matched, and the outlet of the buffer tank is connected to the outlet of the deamination adsorption system through a pipeline. The inlet of the compressor is also connected with the outlet of the deamination adsorption system, a small amount of outlet gas is compressed at ordinary times to enter the buffer tank, the pressure of the buffer tank is maintained, the compressor is stopped and the valve of the outlet of the buffer tank is opened to supplement the gas quantity after the deamination adsorption system is switched every time, so that the gas quantity is close to the gas quantity before the switching. Thus, the fluctuation of the outlet gas quantity of the deamination adsorption system is reduced, and the influence on the rectification system is reduced; aiming at the problem that the adsorbent adsorbs methane, the analysis gas of another adsorption cylinder is temporarily stored in the buffer tank through the compressor, and because the analysis gas is originally waste gas to be emptied, the main component is consistent with the gas component after the adsorption cylinder, more methane exists, the adsorption cylinder is reversely blown by the part of the decompression gas before the pressure equalization of the adsorption cylinder, so that the adsorbent is saturated to adsorb additional tiles, the methane adsorption amount after the adsorption cylinder is switched is greatly reduced, and the influence on the methane content of outlet gas is greatly reduced.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of the structure of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The system for improving purification and separation stability and argon extraction rate of the synthesis ammonia purge gas comprises a deamination adsorption system 1, a rectification system 3, a buffer tank 6, a compressor 5, a first valve 7 and a second valve 8, wherein an air inlet of the deamination adsorption system 1 is connected to raw gas, and an air outlet of the deamination adsorption system is connected to the rectification system 3 through a main exhaust pipeline 2; be equipped with buffer tube branch road 17 on the exhaust trunk line 2, connect gradually first valve 7, compressor 5 on the buffer tube branch road 17, compressor 5 is connected to the inlet end of buffer tank 6, the end of giving vent to anger of buffer tank 6 is connected to the buffer tube branch road 17 between first valve 7 and the exhaust trunk line 2 through the pipeline of taking second valve 8.
The pressure release gas outlet of the deamination adsorption system 1 is also connected with a pressure release gas recovery system 20, and the pressure release gas recovery system 20 is connected to the gas inlet of the deamination adsorption system 1; the deamination adsorption system 1 is also provided with an ammonia water washing system which is connected to an ammonia water user 19 through an ammonia water pipeline 14; the off-gas discharge of the deamination adsorption system 1 is connected via a first flare, dispersion line 13 to a common discharge line 16, the common discharge line 16 being connected to a user discharge line end 18; the deamination adsorption system 1 is of a three-cylinder adsorption structure and sequentially comprises an adsorption cylinder, a cold blowing adsorption cylinder and a heating regeneration adsorption cylinder, and a waste nitrogen outlet of the rectification system 3 is connected to the deamination adsorption system 1 and is used as a cold blowing adsorption cylinder air source through a cold blowing regeneration air pipeline 4; the liquid argon outlet of the rectification system 3 is connected to a liquid argon deoxidizing system 9, and the liquid hydrogen outlet of the rectification system 3 is connected to H 2 A purifier 10, the methane outlet of the rectification system 3 being connected to an LNG storage tank 11, the LNG storage tank 11 being connected to an LNG filling system 12; the off-gas outlet of the rectification system 3 is connected via a second flare, dispersion conduit 15 to a common discharge conduit 16, which common discharge conduit 16 is connected to a user discharge conduit end 18.
In the invention, after three towers of the deamination adsorption system 1 are adsorbed, a compressor 5 and a buffer tank 6 are arranged, an inlet of the compressor 2 and an outlet of the buffer tank 6 are connected with a main exhaust pipeline 2 after the three towers are adsorbed, and when the three towers are not switched, the compressor 5 is used for slowly compressing a small amount of gas in the main exhaust pipeline 2 to enter the buffer tank 6; after the three-tower adsorption is switched, the compressor 5 is stopped, and the gas in the buffer tank 6 is supplemented into the exhaust main pipeline 2 after the three-tower adsorption, so that the gas flow tends to be stable. After three towers adsorb and switch, stop the compressor and open buffer tank outlet valve and supplement the tolerance for tolerance is close with the tolerance before switching, has greatly reduced three towers and adsorbed the influence of flow fluctuation switching to rectification system 3.
And meanwhile, three towers are used for absorbing and resolving gas which is originally waste gas to be exhausted and is reversely blown to an adsorption cylinder by the buffer tank 6, wherein the main component of the resolving gas is consistent with the gas component behind the adsorption cylinder, more methane exists, the part of the decompressing gas is reversely blown to the adsorption cylinder before the pressure equalization of the adsorption cylinder, and the adsorbent is saturated to absorb additional tiles, so that the methane absorption amount after the adsorption cylinder is switched is greatly reduced, and the influence on the methane content of outlet gas is greatly reduced.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (6)
1. The system for improving purification and separation stability and argon extraction rate of the synthesis ammonia purge gas is characterized by comprising a deamination adsorption system (1), a rectification system (3), a buffer tank (6), a compressor (5), a first valve (7) and a second valve (8), wherein an air inlet of the deamination adsorption system (1) is connected to raw gas, and an air outlet of the deamination adsorption system is connected to the rectification system (3) through an exhaust main pipeline (2); the buffer tube branch (17) is arranged on the main exhaust pipeline (2), the buffer tube branch (17) is sequentially connected with a first valve (7) and a compressor (5), the compressor (5) is connected to the air inlet end of the buffer tank (6), and the air outlet end of the buffer tank (6) is connected to the buffer tube branch (17) between the first valve (7) and the main exhaust pipeline (2) through a pipeline with a second valve (8); the pressure release gas outlet of the deamination adsorption system (1) is also connected with a pressure release gas recovery system (20), and the pressure release gas recovery system (20) is connected to the gas inlet of the deamination adsorption system (1).
2. A system for improving purification and separation stability and argon extraction rate of synthesis ammonia purge gas according to claim 1, wherein the deamination adsorption system (1) is further provided with an ammonia water washing system connected to an ammonia water user (19) through an ammonia water pipe (14).
3. A system for improving purification and separation stability and argon extraction rate of synthesis ammonia purge gas according to claim 1, characterized in that the exhaust gas discharge of the deamination adsorption system (1) is connected to a common discharge conduit (16) through a first flare, dispersion conduit (13), the common discharge conduit (16) being connected to a user discharge conduit end (18).
4. The system for improving purification and separation stability and argon extraction rate of synthesis ammonia purge gas according to claim 1, wherein the deamination adsorption system (1) is of a three-cylinder adsorption structure, which is an adsorption cylinder, a cold blowing adsorption cylinder and a heating regeneration adsorption cylinder in sequence, and the waste nitrogen outlet of the rectification system (3) is connected to the deamination adsorption system (1) and is used as a cold blowing adsorption cylinder air source through a cold blowing regeneration air pipeline (4).
5. A system for improving purification and separation stability and argon extraction rate of synthesis ammonia purge gas according to claim 1, wherein the liquid argon outlet of the rectification system (3) is connected to a liquid argon deoxygenation system (9), and the liquid hydrogen outlet of the rectification system (3) is connected to H 2 -a purifier (10), the methane outlet of the rectification system (3) being connected to an LNG storage tank (11), the LNG storage tank (11) being connected to an LNG filling system (12).
6. A system for improving purification and separation stability and argon extraction rate of synthesis ammonia purge gas according to claim 1, characterized in that the waste gas outlet of the rectification system (3) is connected to a common discharge conduit (16) through a second flare, dispersion conduit (15), the common discharge conduit (16) being connected to a user discharge conduit end (18).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710824037.XA CN107539967B (en) | 2017-09-13 | 2017-09-13 | System for improving purification and separation stability and argon extraction rate of synthesis ammonia purge gas |
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| CN201710824037.XA CN107539967B (en) | 2017-09-13 | 2017-09-13 | System for improving purification and separation stability and argon extraction rate of synthesis ammonia purge gas |
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| CN107539967A CN107539967A (en) | 2018-01-05 |
| CN107539967B true CN107539967B (en) | 2023-11-03 |
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| CN101737309A (en) * | 2009-11-26 | 2010-06-16 | 河南心连心化肥有限公司 | Device and method for stabilizing pressure of decarburizing pressure swing adsorption vacuum pump |
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2017
- 2017-09-13 CN CN201710824037.XA patent/CN107539967B/en active Active
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| CN101737309A (en) * | 2009-11-26 | 2010-06-16 | 河南心连心化肥有限公司 | Device and method for stabilizing pressure of decarburizing pressure swing adsorption vacuum pump |
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| CN104132505A (en) * | 2014-08-15 | 2014-11-05 | 苏州市兴鲁空分设备科技发展有限公司 | Synthesis ammonia waste gas recycling and comprehensive utilizing device |
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