CN218755616U - System for producing carbon dioxide by purifying synthesis gas - Google Patents
System for producing carbon dioxide by purifying synthesis gas Download PDFInfo
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- CN218755616U CN218755616U CN202223355824.XU CN202223355824U CN218755616U CN 218755616 U CN218755616 U CN 218755616U CN 202223355824 U CN202223355824 U CN 202223355824U CN 218755616 U CN218755616 U CN 218755616U
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Abstract
The utility model belongs to the technical field of purify, a system for producing carbon dioxide by purifying synthesis gas is related to, including crude gas precooler, sulphur washing tower, carbon dioxide condenser, carbon dioxide separator and the lightness-removing component tower that communicate in proper order, the sulphur washing tower still communicates with the lightness-removing component tower, sets up sulphur washing section and alcohol washing section from top to bottom in the sulphur washing tower in proper order, the crude gas precooler communicates through sulphur washing section, alcohol washing section and carbon dioxide condenser; the light component removing tower is communicated with the alcohol washing section. The utility model provides a system for synthesis gas purifies production carbon dioxide, can direct output liquid food level carbon dioxide, it is with low costs and the energy consumption is little.
Description
Technical Field
The utility model belongs to the technical field of purify, a system for synthesis gas purifies production carbon dioxide is related to.
Background
Syngas purification refers to a process of removing impurities such as hydrogen sulfide, carbonyl sulfide, carbon dioxide, etc. from a gas by physical or chemical means. The synthesis contains a large amount of carbon dioxide, which is an important raw material of soda ash, urea and the like, and CO 2 The excess will poison the ammonia synthesis catalyst and carbon dioxide is removed and partially recovered as product or process feed.
Currently, methanol washing is mostly used for removing carbon dioxide, and although removal and recovery of carbon dioxide can be realized, the following problems exist: the carbon dioxide content is high, a large amount of methanol is needed for washing, and the cost is high; the synthesis gas temperature is high, the washing is carried out at a low temperature, and the energy consumption in the whole process is high; the existing recovered carbon dioxide is normal pressure gas, and for liquid carbon dioxide, the carbon dioxide needs to be further pressurized and then liquefied, so that the treatment process and the treatment cost are increased.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem that the existing synthesis purification gas is high in cost and energy consumption, the utility model provides a system for producing carbon dioxide by purifying synthesis gas, which can directly produce liquid carbon dioxide, is low in cost and low in energy consumption, and the product is food-grade carbon dioxide.
In order to realize the purpose, the utility model discloses a technical scheme is:
a system for producing carbon dioxide by purifying synthesis gas comprises a crude gas precooler, a sulfur washing tower, a carbon dioxide condenser, a carbon dioxide separator and a light component removal tower which are sequentially communicated, wherein the sulfur washing tower is also communicated with the light component removal tower.
Furthermore, a sulfur washing section and an alcohol washing section are sequentially arranged in the sulfur washing tower from bottom to top, and the crude gas precooler is communicated with the carbon dioxide condenser through the sulfur washing section and the alcohol washing section; the light component removing tower is communicated with the alcohol washing section.
Furthermore, a washing pipeline is externally connected to the sulfur washing section, and the washing pipeline is a carbon-rich alcohol washing pipeline.
Furthermore, a raw material pipeline and a liquid discharge pipeline are respectively externally connected to the raw gas precooler, the raw material pipeline is communicated with the sulfur washing section through the raw gas precooler, and the liquid discharge pipeline is discharged outside after passing through the raw gas precooler.
Further, the system for producing carbon dioxide by purifying synthesis gas also comprises a liquid carbon dioxide pump arranged between the light component removal tower and the alcohol washing section.
Furthermore, a refrigerant pipeline is externally connected to the carbon dioxide condenser.
Further, the system for producing carbon dioxide by purifying synthesis gas also comprises a raw material gas heat exchanger, and the alcohol washing section is communicated with the side part of the carbon dioxide separator through the raw material gas heat exchanger; the top of the carbon dioxide separator is communicated with the feed gas heat exchanger.
Further, the system for producing carbon dioxide by purifying synthesis gas also comprises a separator arranged between the raw gas precooler and the sulfur washing tower.
Further, the system for producing carbon dioxide by purifying synthesis gas also comprises a pressure reducing valve arranged between the carbon dioxide separator and the light component removal tower.
Further, the system for producing carbon dioxide by purifying synthesis gas also comprises a reboiler respectively communicated with the bottom of the light component removal tower and the side of the light component removal tower.
The utility model has the advantages that:
1. the utility model provides a system when the partial liquefaction of purified gas produces carbon dioxide, can the desorption carbon dioxide in the synthetic gas to output liquid food level carbon dioxide product, the processing procedure is short, and is with low costs, and the energy consumption is little.
2. The utility model discloses an in the system, the synthetic gas that comes out at the top from the sulphur scrubber, partly through the cooling of carbon dioxide condenser, the separation gas heat transfer cooling that another part comes out through feed gas heat exchanger and separator for cold volume obtains recycle, reduces the energy consumption.
3. The utility model discloses in, utilize tail gas or synthetic gas, carry out the heat exchange with the transform gas, realize the cooling precooling that becomes the gas, realize the recycle of cold and hot energy consumption, reach energy saving and consumption reduction, reduce cost's purpose.
4. The utility model discloses well use the tower to take off the light component, the energy consumption is low, and the desorption is effectual, and the product can realize the carbon dioxide product of various specifications as required. The heat source of the reboiler can use the heat of the system, thus saving the cold consumption of the system.
Drawings
FIG. 1 is a diagram of a production system provided by the present invention;
wherein:
1-raw gas precooler; 2-a separator; 3-sulphur washing tower; 4-a carbon dioxide condenser; 5-carbon dioxide separator; 6-pressure reducing valve; 7-light component removing tower; 8-a reboiler; 9-liquid carbon dioxide pump; 10-raw gas heat exchanger.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings and examples.
Referring to fig. 1, a system for producing carbon dioxide by purifying synthesis gas comprises a crude gas precooler 1, a sulfur washing tower 3, a carbon dioxide condenser 4, a carbon dioxide separator 5 and a light component removal tower 7 which are sequentially communicated, wherein the sulfur washing tower 3 is also communicated with the light component removal tower 7.
In the embodiment, the raw gas precooler 1 is externally connected with a raw material pipeline and a liquid discharge pipeline respectively, the raw material pipeline is communicated with the sulfur washing section through the raw gas precooler 1, and the liquid discharge pipeline is discharged outside after passing through the raw gas precooler 1.
Specifically, a raw material gas (synthesis gas) is introduced into the raw material pipeline, and a shift gas can also be introduced into the raw material pipeline during implementation.
The tail gas pipeline is filled with gas, and the gas is methanol washing regeneration gas, methanol synthesis gas, synthetic ammonia gas or separation gas. The gas in the tail gas pipeline exchanges heat with the raw material gas in the raw material pipeline, the raw material gas is cooled, the consumption of the detergent in the sulfur washing tower is saved, meanwhile, the recycling of the heat of the raw material gas is realized, and the purpose of energy conservation is achieved.
In this embodiment, the system for producing carbon dioxide by purifying synthesis gas further comprises a separator 2 arranged between the raw gas precooler 1 and the sulfur washing tower 3.
The side part of the separator 2 is communicated with the raw gas precooler 1, the bottom of the separator 2 is connected with an external discharge pipe, and the top of the separator 2 is communicated with a sulfur washing section of a sulfur washing tower 3.
In the embodiment, a sulfur washing section and an alcohol washing section are sequentially arranged in a sulfur washing tower 3 from bottom to top, and after liquid is condensed and separated by a crude gas precooler 1, the liquid is communicated with a carbon dioxide condenser 4 through the sulfur washing section and the alcohol washing section; the light component removing tower 7 is communicated with the alcohol washing section. The sulfur washing section is externally connected with a washing pipeline, and the washing pipeline is a carbon-rich alcohol washing pipeline.
The sulfur washing tower 3 is a column tower, the lower part is a sulfur washing section, the upper part is an alcohol washing section, the middle part is separated by a tower plate, and the sulfur washing section is communicated with the alcohol washing section.
The side wall of the sulfur washing section is provided with an air inlet and a washing pipeline interface, the air inlet is lower than the washing pipeline interface, and the air inlet is communicated with the top of the separator 2; the washing pipeline interface is communicated with an external washing pipeline; the side wall of the upper part of the alcohol washing section is communicated with the bottom of a light component removal tower 7 through a liquid carbon dioxide pump 9, and the top of the alcohol washing section is respectively communicated with a carbon dioxide condenser 4 and a carbon dioxide separator 5.
A refrigerant pipeline is externally connected to the carbon dioxide condenser 4. Carbon dioxide condenser 4 includes left cavity and right cavity, connects through the baffle between left cavity and the right cavity, washes the top of mellow wine section and communicates through the lateral part of left cavity with carbon dioxide separator 5, and the cryogen pipeline is discharged through right cavity, and the cryogen in the cryogen pipeline passes through right cavity, and with the separation back feed gas heat transfer in getting into left cavity, the heat is absorbed to the cryogen, realizes heat recovery.
The top of the carbon dioxide separator 5 is discharged after passing through the raw material gas heat exchanger 10, the top of the alcohol washing section is communicated with the side part of the carbon dioxide separator 5 after passing through the raw material gas heat exchanger 10, and the bottom of the carbon dioxide separator 5 is communicated with the side part of the light component removal tower 7 through the pressure reducing valve 6.
Flash evaporation or recovery is carried out on the top of the light component removing tower 7 for standby, the bottom of the light component removing tower 7 is divided into three paths, and the first path recovers liquid carbon dioxide products (most of the liquid carbon dioxide products)) The second path returns to the lower side part of the light component removal tower 7 through a reboiler 8, and the third path is communicated with the upper side wall of the alcohol washing section through a liquid carbon dioxide pump 9. The second path and the third path are small parts, and the main purpose is to supplement liquid into the alcohol washing section or the light component removal tower 7 to improve CO in the alcohol washing section 2 The concentration is favorable for releasing and removing the light components in the light component removing tower 7.
The process for purifying synthesis gas and producing carbon dioxide provided by the embodiment is as follows:
and (3) purifying by-product process: the gas is condensed by a crude gas precooler 1 and separated by a separator 2, then enters a sulfur washing section of a sulfur washing tower 3 to transfer mass with a carbon-rich methanol detergent, and sulfur-containing components in the separated gas are absorbed and are sent to flash evaporation and regeneration as sulfur-rich methanol, and cold energy and regeneration are recycled to generate recycled methanol, tail gas and sulfur-rich gas.
The desulfurized gas continuously passes through an alcohol washing section of the sulfur washing tower 3 upwards to transfer mass with liquid carbon dioxide from the bottom of the light component removal tower 7, the liquid carbon dioxide is washed to recycle methanol gas, the washing liquid is regenerated and then returned to the lower tower of the sulfur washing tower 3 to realize circulating washing, and a part of desulfurized gas passes through a carbon dioxide condenser 4 to exchange heat with refrigerant (the refrigerant is determined according to requirements) so that a part of carbon dioxide in the desulfurized gas is condensed and then enters a carbon dioxide separator 5; the other part of desulfurized coal gas enters a carbon dioxide separator 5 after passing through a raw material gas heat exchanger 10, and the gas separated by the carbon dioxide separator 5 is discharged by the raw material gas heat exchanger 10 to exchange heat with the other part of desulfurized coal gas, so that the heat exchange is realized, the energy is saved, and the condensation recovery rate is improved. The separated liquid separated by the carbon dioxide separator 5 is decompressed by a decompression valve 6 and then enters a light component removing tower 7 to remove light components, a liquid carbon dioxide product is recovered at the bottom of the light component removing tower 7, and the quality of the carbon dioxide can meet the food-grade requirement; most of the liquid carbon dioxide returns to the product warehouse, a small part of the liquid carbon dioxide returns to the top of the sulfur washing tower 3 to wash the carbon dioxide, a small part of the liquid carbon dioxide returns to the light component removing tower 7 through the reboiler 8, and liquid supplement is carried out on the light component removing tower 7, so that light components (dissolved gas) in the light component removing tower 7 are released from the top of the light component removing tower 7, and the light components (dissolved gas) are collected and can also enter the flash evaporation gas compressor for recycling.
In the utility model, the lower tower of the sulfur washing tower 3 is used for washing sulfur, the upper tower is used for washing methanol by liquid carbon dioxide, then the sulfur-containing gas mainly containing hydrogen sulfide is washed by the sulfur-washing segment through the carbon dioxide condenser 4 and the light component removing tower 7, the carbon dioxide at the upper section of the sulfur washing tower is used for washing trace methanol carried by the gas, the methanol is washed by the carbon dioxide, the methanol is an important link for producing food-grade carbon dioxide, the methanol loss brought during the production of the carbon dioxide is reduced, and the sulfur washing tower is energy-saving and environment-friendly; the coal gas discharged from the carbon dioxide separator is sent to a carbon dioxide washing tower, and the carbon dioxide is washed by methanol; the methyl alcohol after the washing is called rich carbon methyl alcohol and is removed the sulphur washing section, the utility model discloses realize the liquefaction behind coal gas sulphur washing, the washing alcohol, the lightness component of taking off of product liquid carbon dioxide to and the synthetic gas after the separation carbon dioxide removes the washing carbon, purifies the great decline of manufacturing cost, and the energy consumption is few.
Claims (10)
1. The system for producing the carbon dioxide by purifying the synthesis gas is characterized by comprising a crude gas precooler (1), a sulfur washing tower (3), a carbon dioxide condenser (4), a carbon dioxide separator (5) and a light component removal tower (7) which are sequentially communicated, wherein the sulfur washing tower (3) is also communicated with the light component removal tower (7).
2. The system for producing the carbon dioxide by purifying the synthesis gas as claimed in claim 1, wherein a sulfur washing section and an alcohol washing section are sequentially arranged in the sulfur washing tower (3) from bottom to top, and the crude gas precooler (1) is communicated with the carbon dioxide condenser (4) through the sulfur washing section and the alcohol washing section; the light component removing tower (7) is communicated with the alcohol washing section.
3. The system for purifying synthesis gas and producing carbon dioxide according to claim 2, wherein a washing pipeline is externally connected to the sulfur washing section, and the washing pipeline is a carbon-rich alcohol washing pipeline.
4. The system for producing carbon dioxide by purifying synthesis gas as claimed in claim 3, wherein the raw gas precooler (1) is externally connected with a raw material pipeline and a liquid discharge pipeline respectively, the raw material pipeline is communicated with the sulfur washing section through the raw gas precooler (1), and the liquid discharge pipeline is discharged outside after passing through the raw gas precooler (1).
5. The system for the purification production of carbon dioxide from synthesis gas according to claim 4, further comprising a liquid carbon dioxide pump (9) disposed between the light components removal column (7) and the alcohol washing section.
6. System for the purification of synthesis gas to produce carbon dioxide according to any of claims 2 to 5, characterised in that the carbon dioxide condenser (4) is externally connected with a refrigerant line.
7. The system for purifying synthesis gas to produce carbon dioxide according to claim 6, further comprising a raw gas heat exchanger (10), wherein the alcohol washing section is communicated with the side of the carbon dioxide separator (5) through the raw gas heat exchanger (10); the top of the carbon dioxide separator (5) is communicated with a raw material gas heat exchanger (10).
8. The system for the purification production of carbon dioxide from synthesis gas according to claim 7, further comprising a separator (2) arranged between the raw gas pre-cooler (1) and the sulphur scrubber (3).
9. The system for the purification of synthesis gas to produce carbon dioxide according to claim 8, further comprising a pressure reducing valve (6) disposed between the carbon dioxide separator (5) and the light ends removal column (7).
10. The system for the purification of synthesis gas to produce carbon dioxide according to claim 9, further comprising a reboiler (8) in communication with the bottom of the light ends removal column (7) and the side of the light ends removal column (7), respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223355824.XU CN218755616U (en) | 2022-12-12 | 2022-12-12 | System for producing carbon dioxide by purifying synthesis gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223355824.XU CN218755616U (en) | 2022-12-12 | 2022-12-12 | System for producing carbon dioxide by purifying synthesis gas |
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| Publication Number | Publication Date |
|---|---|
| CN218755616U true CN218755616U (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223355824.XU Active CN218755616U (en) | 2022-12-12 | 2022-12-12 | System for producing carbon dioxide by purifying synthesis gas |
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