CN113058377A - Carbon monoxide tail gas purification method - Google Patents
Carbon monoxide tail gas purification method Download PDFInfo
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- CN113058377A CN113058377A CN202010003013.XA CN202010003013A CN113058377A CN 113058377 A CN113058377 A CN 113058377A CN 202010003013 A CN202010003013 A CN 202010003013A CN 113058377 A CN113058377 A CN 113058377A
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- carbon monoxide
- gas
- ammonia
- tail gas
- adsorption tower
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/40—Carbon monoxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/20—Carbon monoxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/406—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/404—Further details for adsorption processes and devices using four beds
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2210/00—Purification or separation of specific gases
- C01B2210/0001—Separation or purification processing
- C01B2210/0009—Physical processing
- C01B2210/0014—Physical processing by adsorption in solids
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- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Of Gases By Adsorption (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention relates to a carbon monoxide tail gas purification method, which reduces the residual amount of ammonia gas through a pressure swing adsorption ammonia removal process, avoids crystallization phenomenon of partial ammonia gas entering a subsequent system along with carbon monoxide, influences normal operation of production, does not generate industrial ammonia-containing wastewater, adsorbs water vapor in the carbon monoxide, avoids concentration of the water vapor in the system, causes bad system state, and sends ammonia-containing desorption gas in the deamination process back to a decomposition process as decomposition carrier gas, thereby effectively saving the consumption of fresh ammonia gas.
Description
Technical Field
The invention relates to the field of industrial tail gas treatment, in particular to a carbon monoxide tail gas purification method.
Background
The decomposition process principle of carbonyl iron powder is to utilize the instability of pentacarbonyl iron to decompose the pentacarbonyl iron under the conditions of high temperature and low pressure to generate elementary substance iron (carbonyl iron powder) and carbon monoxide, wherein the carbon monoxide generated in the decomposition process is purified by a tail gas treatment system and then recycled, the decomposition process temperature is high, the disproportionation reaction of the carbon monoxide is easily caused to generate carbon dioxide and elementary substance carbon, the elementary substance carbon is mixed in the iron powder under the condition to influence the product purity, in order to inhibit the disproportionation reaction of the carbon monoxide and ensure the product quality, ammonia gas is added as carrier gas in the production process, the ammonia gas mixed in the carbon monoxide needs to be removed in the carbon monoxide recovery process to purify the carbon monoxide, in the original production process, the decomposed tail gas is conveyed to the compression process by a fan, after being compressed, the decomposed tail gas is conveyed to a water washing system to be washed with water to remove ammonia, the carbon monoxide after ammonia is removed is dried and conveyed, in the process, a large amount of industrial ammonia-containing wastewater is generated by water washing, the water washing effect is not ideal, partial ammonia enters the spherical tank along with carbon monoxide, the crystallization phenomenon occurs in a synthesis system, the system is blocked, the normal operation of production is influenced, when the drying effect is not good, a follow-up system can bring a small amount of water vapor, and the system is enriched in the system, so that the system state is not good.
Therefore, the invention cancels the water washing-drying device, adopts a method of directly adsorbing ammonia, reduces the residual amount of ammonia, avoids the crystallization phenomenon that part of ammonia enters a subsequent system along with carbon monoxide to influence the normal operation of production, does not generate industrial ammonia-containing wastewater, adsorbs water vapor in the carbon monoxide at the same time, avoids the concentration of the water vapor in the system to cause poor system state, and returns ammonia-containing desorption gas in the deamination process to a decomposition process as decomposition carrier gas, thereby effectively saving the consumption of fresh ammonia.
Disclosure of Invention
The invention aims to provide a carbon monoxide tail gas purification method, which can reduce the residual amount of ammonia gas, does not generate industrial ammonia-containing wastewater any more, can recycle the ammonia gas in the deamination process and saves the cost.
In order to achieve the above purpose, the following technical scheme is provided:
a carbon monoxide tail gas purification method is characterized in that tail gas purification is realized by utilizing an air inlet buffer tank, an adsorption tower and a spherical tank, and the carbon monoxide tail gas purification method comprises the following steps:
compressing carbon monoxide tail gas through an air inlet buffer tank to provide raw material gas for the subsequent steps;
secondly, the raw material gas passes through an adsorption tower, and the adsorption tower absorbs ammonia gas and a certain amount of other impurities;
and step three, obtaining a finished product of carbon monoxide with ammonia impurities removed at the outlet end of the adsorption tower, and sending the finished product of carbon monoxide into a spherical tank for storage.
And step four, after the adsorption tower is saturated, the reverse release step is carried out, desorption gas containing ammonia impurity components occluded in the adsorption tower is discharged, and the desorption gas is subjected to pressure stabilization through two tail gas buffer tanks and then is sent to a decomposition system to be used as carrier gas.
Preferably, the adsorption tower in the second step consists of four adsorbers, and any one of the four adsorbers is always in an adsorption state.
Preferably, the pressure of the compressed tail gas in the first step is 1.0 MPa.
Preferably, when one of the adsorbers works, the pressure equalization drops of the other three adsorbers are all pressure equalization rises of the adsorbers in the adsorption state, so that the adsorption efficiency is fully improved.
The invention has the beneficial effects that:
1. the invention obviously improves the deamination effect, can reduce 7200t of ammonia-containing wastewater discharged every year, reduces a large amount of hazardous waste discharge and saves the environmental treatment cost.
2. The ammonia-containing desorption gas generated by the invention is recycled to the decomposition process for repeated use, the consumption of ammonia gas in production is greatly reduced, 48.5 tons of ammonia gas can be saved every year, and the production cost is saved.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The present design will be described in detail below.
A carbon monoxide tail gas purification method is characterized in that tail gas purification is realized by utilizing an air inlet buffer tank, an adsorption tower and a spherical tank, wherein the carbon monoxide tail gas purification method comprises the following steps:
compressing carbon monoxide tail gas through an air inlet buffer tank to provide raw material gas for the subsequent steps;
secondly, the raw material gas passes through an adsorption tower, and the adsorption tower absorbs ammonia gas and a certain amount of other impurities;
and step three, obtaining a finished product of carbon monoxide with ammonia impurities removed at the outlet end of the adsorption tower, and sending the finished product of carbon monoxide into a spherical tank for storage.
And step four, after the adsorption tower is saturated, the reverse release step is carried out, desorption gas containing ammonia impurity components occluded in the adsorption tower is discharged, and the desorption gas is subjected to pressure stabilization through two tail gas buffer tanks and then is sent to a decomposition system to be used as carrier gas.
And the adsorption tower in the step two consists of four adsorbers, and any one of the four adsorbers is always in an adsorption state.
Wherein the pressure of the compressed tail gas in the first step is 1.0 MPa.
When one adsorber works, the pressure balance drop of the other three adsorbers is the pressure balance rise of the adsorber in the adsorption state, so that the adsorption efficiency is fully improved.
Wherein the concentration of NH3 in the finished carbon monoxide obtained at the outlet end of the adsorption tower after ammonia gas impurities are removed is less than 1000 ppm.
Examples
600m generated in the decomposition process of carbonyl iron powder3The normal pressure carbon monoxide tail gas of the reaction is/h, and the tail gas contains NH3, 2-3%; CO2, 0.2%; n2, 0.5 percent and the balance of carbon monoxide, the pressure of tail gas is 1.0MPa after the tail gas is compressed by an air inlet buffer tank, the raw gas containing pressure is provided for the subsequent steps, the raw gas passes through any one of four adsorbers, the other three adsorbers reduce the pressure under the action of a program control valve and provide pressure balance rise for one working adsorber to improve the adsorption efficiency, after the working adsorber is saturated, the other adsorbers continue to start one adsorber, the saturated adsorber enters a reverse release step to discharge desorption gas containing components of ammonia impurities occluded in the adsorption tower, the desorption gas is sent into a decomposition system after being stabilized in pressure by two buffer tanks to be used as carrier gas, the outlet end of the adsorber obtains finished carbon monoxide without ammonia impurities, at the moment, the concentration of NH3 of the finished carbon monoxide without ammonia impurities obtained at the outlet end of the adsorption tower is less than 1000ppm and then sent into a spherical tank for storage, applications ofIn the next step.
Claims (4)
1. The carbon monoxide tail gas purification method is characterized in that tail gas purification is realized by utilizing an air inlet buffer tank, an adsorption tower and a spherical tank, and the carbon monoxide tail gas purification method comprises the following steps:
compressing carbon monoxide tail gas through an air inlet buffer tank to provide raw material gas for the subsequent steps;
secondly, the raw material gas passes through an adsorption tower, and the adsorption tower absorbs ammonia gas and a certain amount of other impurities;
and step three, obtaining a finished product of carbon monoxide with ammonia impurities removed at the outlet end of the adsorption tower, and sending the finished product of carbon monoxide into a spherical tank for storage.
And step four, after the adsorption tower is saturated, the reverse release step is carried out, desorption gas containing ammonia impurity components occluded in the adsorption tower is discharged, and the desorption gas is subjected to pressure stabilization through two tail gas buffer tanks and then is sent to a decomposition system to be used as carrier gas.
2. The method of claim 1, wherein the adsorption tower in the second step comprises four adsorbers, and any one of the four adsorbers is in an adsorption state.
3. The method of claim 1, wherein the pressure of the compressed tail gas in the first step is 1.0 MPa.
4. The method of claim 2, wherein when one of the adsorbers is operating, the pressure equalization drop of the other three adsorbers is the pressure equalization rise of the adsorber in the adsorption state, so as to substantially improve the adsorption efficiency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010003013.XA CN113058377A (en) | 2020-01-02 | 2020-01-02 | Carbon monoxide tail gas purification method |
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| CN202010003013.XA CN113058377A (en) | 2020-01-02 | 2020-01-02 | Carbon monoxide tail gas purification method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5531809A (en) * | 1994-09-14 | 1996-07-02 | Air Products And Chemicals, Inc. | Pretreatment layer for CO-VSA |
| CN101597069A (en) * | 2009-06-29 | 2009-12-09 | 浙江理工大学 | A kind of purification process of ammonia |
| CN102266702A (en) * | 2011-06-03 | 2011-12-07 | 清华大学 | Method for capturing ammonia in industrial waste gas and equipment and application thereof |
| CN103406090A (en) * | 2013-08-06 | 2013-11-27 | 上海正帆科技有限公司 | Preparation method for dry adsorbent used for absorbing ammonia gas |
-
2020
- 2020-01-02 CN CN202010003013.XA patent/CN113058377A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5531809A (en) * | 1994-09-14 | 1996-07-02 | Air Products And Chemicals, Inc. | Pretreatment layer for CO-VSA |
| CN101597069A (en) * | 2009-06-29 | 2009-12-09 | 浙江理工大学 | A kind of purification process of ammonia |
| CN102266702A (en) * | 2011-06-03 | 2011-12-07 | 清华大学 | Method for capturing ammonia in industrial waste gas and equipment and application thereof |
| CN103406090A (en) * | 2013-08-06 | 2013-11-27 | 上海正帆科技有限公司 | Preparation method for dry adsorbent used for absorbing ammonia gas |
Non-Patent Citations (6)
| Title |
|---|
| 伍沅: "《化工过程动态》", 31 May 1998, 化学工业出版社 * |
| 刘洪波等: "微米级羰基铁粉的制取和应用", 《中国金属通报》 * |
| 卢苗蕊: "畜舍内有害气体的危害及解决措施", 《畜牧兽医科技信息》 * |
| 张丽芳等: "《化工专业实验》", 30 September 2018, 中国矿业大学出版社 * |
| 张洪流: "《化工原理 传质与分离技术手册》", 30 September 2009, 国防工业出版社 * |
| 王均利等: "氨气吸附材料的研究进展", 《过程工程学报》 * |
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