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Method for co-production of high-concentration liquid CO2 by utilizing low-temperature methanol washing process

A low-temperature methanol washing and high-concentration technology, applied in chemical instruments and methods, liquefaction, products, etc., can solve the problem of high energy consumption and achieve the effects of enhanced energy conservation and environmental protection, large-scale products, and reduced energy consumption and material loss

Active Publication Date: 2017-02-15
WISON ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the low-temperature methanol washing process acid gas removal process disclosed in Chinese patent ZL 201010599841.0, in this process, the energy consumption is very high when the low-temperature methanol washing absorbs carbon dioxide and methanol regeneration

Method used

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  • Method for co-production of high-concentration liquid CO2 by utilizing low-temperature methanol washing process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as figure 1 As shown, the low-temperature methanol washing process is used to purify two different feed gases, which are the sulfur-containing shift gas 1 from the upstream shift unit and the CO-enriched gas from the methanation unit.2 1. The sulfur-free crude methane feed gas 10 is used to co-produce part of the high-concentration liquid carbon dioxide product through the present invention during the desulfurization and decarbonization process using the low-temperature methanol washing process.

[0040] In this embodiment, the temperature of raw material gas 10 is 40°C, the pressure is 5.5MPa(G), and the flow rate is 180kNm 3 / h, the concentration of each component in the feed gas 10 is CO 2 : 66.7%, CH 4 : 32.7%, H 2 : 0.16%, N 2 : 0.24%, Ar: 0.2%, the present invention is realized through the following steps:

[0041] (1). After the raw material gas 10 is dried by the dehydration system 11, the water content in the raw material gas 10 is less than 20ppm;

...

Embodiment 2

[0060] Such as figure 1 As shown, the low-temperature methanol washing process is used to purify two different feed gases, which are the sulfur-containing shift gas 1 from the upstream shift unit and the CO-enriched gas from the methanation unit. 2 1. Sulfur-free crude methane gas 10 is used to co-produce part of high-concentration liquid carbon dioxide products through the present invention during the desulfurization and decarbonization process using the low-temperature methanol washing process.

[0061] In this embodiment, the temperature of raw material gas 10 is 40°C, the pressure is 3.1MPa(G), and the flow rate is 162kNm 3 / h, the concentration of each component in the feed gas 10 is CO 2 : 68%, CH 4 : 31.33%, H 2 : 0.18%, N 2 : 0.35%, Ar: 0.14%, the present invention is realized through the following steps:

[0062] (1). After the raw material gas 10 is dried by the dehydration system 11, the water content in the raw material gas 10 is less than 20ppm;

[0063] (2)...

Embodiment 3

[0070] Such as figure 1 As shown, the low-temperature methanol washing process is used to purify two different feed gases, which are the sulfur-containing shift gas 1 from the upstream shift unit and the CO2-rich, sulfur-free crude methane gas from the methanation unit 10. Through the method and device of the present invention, the output of liquid carbon dioxide products can be flexibly adjusted.

[0071] In this embodiment, the temperature of raw material gas 10 is 40°C, the pressure is 5.5MPa(G), and the flow rate is 180kNm 3 / h, the concentration of each component in the feed gas 10 is CO 2 : 66.7%, CH 4 : 32.7%, H 2 : 0.16%, N 2 : 0.24%, Ar: 0.2%, the present invention realizes the joint production of liquid carbon dioxide product through the following steps:

[0072] (1). After the raw material gas 10 is dried by the dehydration system 11, the water content in the raw material gas 10 is less than 20ppm;

[0073] (2). Part of the raw material gas-13 dehydrated in st...

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Abstract

The invention relates to a method for co-production of high-concentration liquid CO2 by utilizing a low-temperature methanol washing process. The method comprises a high-concentration liquid CO2 production process and a low-temperature methanol washing process, wherein the high-concentration liquid CO2 production process comprises the following steps: (A) dehydrating and cooling CO2-rich raw gas and feeding to a first gas and liquid separation tank; (B) feeding a liquid-phase material flow condensed at the bottom of the first gas and liquid separation tank to a CO2 product purification tower for purification and refining; the low-temperature methanol washing process comprises the following steps: (C) absorbing CO2 by low-temperature poor methanol at the top of a decarburization tower; (D) in a desulfurization tower, treating sulfur-containing mixed gas by taking rich methanol as an absorbent; (E) in a methane gas stripping tower, performing gas stripping on the rich methanol entering the tower via the tower top by using the gas phase at the tower bottom so as to recycle methane gas; (F) performing vacuum flashing and heat regeneration by using an H2S concentrating tower and a methanol heat regeneration tower in order to remove acidic gases and regenerate methanol for cyclic utilization. In comparison with the prior art, the method disclosed by the invention has the advantages of low energy consumption, high liquid CO2 product concentration, high raw material utilization rate and the like.

Description

technical field [0001] The invention relates to the field of gas purification, in particular to a method suitable for co-producing part of high-concentration liquid carbon dioxide in the process of decarburizing crude methane gas rich in carbon dioxide by using a low-temperature methanol washing process. Background technique [0002] Carbon dioxide is widely used in chemical industry, machinery, food, agriculture, medicine, tobacco, fire protection and other industries. It not only has a wide range of uses, but also its demand is increasing day by day. In my country's carbon dioxide production, most of them are concentrated in non-chemical industries such as machinery and metallurgy. The production scale is small and the equipment is poor, resulting in low product quality, high energy consumption, and small market capacity. [0003] Production of liquid CO 2 The source of raw material gas is mainly CO produced during the high-temperature calcination of limestone. 2 , CO pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/06C01B32/50C10L3/10
CPCC10L3/103C10L3/104F25J3/067Y02P20/151
Inventor 宫万福闫兵海吕建宁侯宁黄科
Owner WISON ENG
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