CN101664629B - Pressure swing absorption process for improving recovery rate with two groups running simultaneously - Google Patents
Pressure swing absorption process for improving recovery rate with two groups running simultaneously Download PDFInfo
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- CN101664629B CN101664629B CN200910167773.8A CN200910167773A CN101664629B CN 101664629 B CN101664629 B CN 101664629B CN 200910167773 A CN200910167773 A CN 200910167773A CN 101664629 B CN101664629 B CN 101664629B
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Abstract
The invention discloses a pressure swing absorption gas separation process for improving active gas recovery rate, which is characterized in that two groups of adsorption towers are arranged, wherein the first group is used for pressure swing adsorption gas separation in common sense, the second group is arranged to be specially used for recovering active ingredients in the first group reverse deabsorption gas, the recovered active gas ingredients are returned to the first group for pressure swing absorption in a pressure equalizing way, thereby improving pressure swing adsorption gas separation efficiency and active gas recovery rate.
Description
One, technical field
The present invention relates to chemical field, be that a kind of mist is separated pressure swing absorption process, the method is mainly used in the device of conversion gas separating carbon dioxide component.
Two, background technology
For the technology of conversion gas separating carbon dioxide, the usual method used is wet method decarburization and pressure swing adsorption decarbonization.
Wet method decarburization technique, using maximum is propene carbonate decarburization technique and NHD decarburization technique, and this technology is solvent absorption carbon dioxide at elevated pressures, solvent desorption carbon dioxide under low-pressure.Carbon dioxide desorb is generally divided into two stages, first stage tradition is called high sudden strain of a muscle, in desorption gas, gas concentration lwevel is lower, be generally 45-85%, mean concentration is 65%, current most of wet method decarbonization device arranges separator (such as carbonization in addition, pressure-variable adsorption) recycle effective hydrogen in this flash gas, nitrogen, the gases such as carbon monoxide, second stage tradition is called low sudden strain of a muscle, in desorption gas, gas concentration lwevel is higher, be generally 95-100%, mean concentration is 97.5%, urea synthesizing can be directly used in use or produce liquid CO 2.Wet method decarburization, operating cost is high, energy consumption is high, have solvent consumption etc. to become insoluble problem, but to compare common pressure swing adsorption technique higher for gas recovery ratio.
Pressure swing adsorption decarbonization technology, using maximum is one-stage process technique, this technique is absorbing carbon dioxide under high pressure adsorbent, Desorption of Carbon Dioxide under low-pressure, the final desorb of carbon dioxide is generally divided into two stages, first stage tradition is called inverse put, in desorption gas, gas concentration lwevel is lower, be generally 45-85%, mean concentration is 65%, current pressure-changeable adsorption decarbonization device does not arrange separator in addition and recycles effective hydrogen in this inverse put gas, nitrogen, the gases such as carbon monoxide, report is only had to use this emptying gas for the report of blowing-out gas combustion system, second stage tradition is called finds time or rinses, and in desorption gas, gas concentration lwevel is higher, is generally 95-99%, and mean concentration is 97.5%, can be directly used in urea synthesizing and uses or produce liquid CO 2.This technique inverse put gas loss of effective components is serious, becomes the deadly defect of this technology, is almost difficult to overcome.
Three, summary of the invention
In order to better reclaim the active ingredient (hydrogen, carbon monoxide and nitrogen) in decarburization inverse put gas, the present invention utilizes the strategy arranging one group of multiple adsorption tower again, is used for improving gas reclaiming rate.
Adsorption tower is set to two groups, wherein first group of PSA Gas on common meaning is separated, and second group of active ingredient be specifically designed in recovery first group of inverse put desorption gas is set in addition, the available gas composition reclaimed returns first group of pressure-variable adsorption by the mode of all pressing, and improves PSA Gas separative efficiency thus and improves the available gas rate of recovery.
By this technique, the active ingredient in inverse put gas fully can be reclaimed, and the density of carbon dioxide gas of finding time to produce even can reach more than 97%, meet urea synthesizing needs or produce liquid CO 2.
Present invention process has following feature compared with wet method decarbonization process.
Main piece-rate system adopts pressure swing adsorption technique system; As main system, this process has the advantages that investment is little, energy consumption is low, easy to operate relative to wet method decarbonization system.
Have similar wet method decarburization simultaneously and reclaim high system of dodging gas, i.e. other one group of adsorption tower, this system carbon dioxide is continued to be separated obtain gas concentration lwevel not higher than the gaseous mixture of conversion gas concentration.
Present invention process has following feature compared with the pressure-swing absorption apparatus in independent meaning.
Gas recovery ratio improves greatly.The recovery level of wet method decarburization can be met or exceeded completely.
Four, detailed description of the invention
Embodiment 1: conversion gas pressure 0.8MPa, flow 24000NM
3/ H.
First group arranges standard pressure swing adsorption technique, and nine towers three enter three equal techniques, inverse put initial pressure 0.10MPa, and find time end pressure-0.06MPa, conversion gas import carbon dioxide 28%, and outlet 0.2%, meets Ammonia Production requirement.
Second group arranges recovery pressure swing adsorption technique, four towers one enter an equal technique, air inlet initial pressure-0.04MPa, air inlet end pressure 0.08MPa, find time end pressure-0.06MPa, inverse put gas import carbon dioxide 45-85%, outlet 5%, exit gas uses the mode of all pressing to return main system, meets first group of Body components requirement of all calming the anger.
Embodiment 2: conversion gas pressure 1.4MPa, flow 24000NM
3/ H.
First group arranges standard pressure swing adsorption technique, and nine towers three enter three equal techniques, inverse put initial pressure 0.26MPa, and find time end pressure-0.06MPa, conversion gas import carbon dioxide 28%, and outlet 0.2%, meets Ammonia Production requirement.
Second group arranges recovery pressure swing adsorption technique, four towers one enter one equal, air inlet initial pressure-0.04MPa, air inlet end pressure 0.18MPa, find time end pressure-0.06MPa, inverse put gas import carbon dioxide 35-55%, outlet 3%, exit gas uses the mode of all pressing to return main system, meets first group of Body components requirement of all calming the anger.
Embodiment 3: conversion gas pressure 2.7MPa, flow 24000NM
3/ H.
First group arranges standard pressure swing adsorption technique, and 16 towers three enter nine equal techniques, inverse put initial pressure 0.54MPa, and find time end pressure-0.06MPa, conversion gas import carbon dioxide 28%, and outlet 0.2%, meets Ammonia Production requirement.
Second group arranges recovery pressure swing adsorption technique, four towers one enter one equal, air inlet initial pressure-0.04MPa, air inlet end pressure 0.42MPa, find time end pressure-0.06MPa, inverse put gas import carbon dioxide 15-35%, outlet 2%, exit gas uses the mode of all pressing to return main system at twice, meets first group of Body components requirement of all calming the anger.
This patent is used in conversion gas decarbonization device through actual, and effect is fairly obvious, effectively reduces available gas loss, has saved cost.
Claims (1)
1. one kind is improved the adsorption gas separating technology of the available gas rate of recovery, it is characterized in that, adsorption tower is set to two groups, wherein first group of PSA Gas on common meaning is separated, and second group of active ingredient be specifically designed in recovery first group of inverse put desorption gas is set in addition, the available gas composition reclaimed returns first group of pressure-variable adsorption by the mode of all pressing, and improves PSA Gas separative efficiency thus and improves the available gas rate of recovery.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910167773.8A CN101664629B (en) | 2009-09-27 | 2009-09-27 | Pressure swing absorption process for improving recovery rate with two groups running simultaneously |
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| CN200910167773.8A CN101664629B (en) | 2009-09-27 | 2009-09-27 | Pressure swing absorption process for improving recovery rate with two groups running simultaneously |
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| CN101664629A CN101664629A (en) | 2010-03-10 |
| CN101664629B true CN101664629B (en) | 2015-06-24 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179131A (en) * | 2011-04-27 | 2011-09-14 | 杨皓 | Three-group simultaneously-running pressure swing absorption process for increasing recovery rate |
| CN102627259A (en) * | 2012-03-27 | 2012-08-08 | 成都赛普瑞兴科技有限公司 | Method for preparing hydrogen by methanol-water reforming |
| CN105413394B (en) * | 2015-12-25 | 2019-01-15 | 杨皓 | A method of combined using pressure swing adsorption technique from flue gas and produces sour gas and purity nitrogen |
| CN105967184B (en) * | 2016-05-10 | 2018-02-23 | 杨皓 | A kind of technique of conversion gas combined production of ammonia and soda ash |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1334135A (en) * | 2001-07-31 | 2002-02-06 | 成都天立化工科技有限公司 | Process for removing CO2 from conversion gas by pressure swing adsorption method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1879943B (en) * | 2006-05-10 | 2011-08-10 | 杨皓 | Pressure-variable adsorption decarbonization improved process for carbamide and methanol |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1334135A (en) * | 2001-07-31 | 2002-02-06 | 成都天立化工科技有限公司 | Process for removing CO2 from conversion gas by pressure swing adsorption method |
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