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Membrane method low-temperature methanol washing tail gas treatment method and device

A low-temperature methanol washing and tail gas treatment technology, which is applied in special data processing applications, structured data retrieval, database indexing, etc. The effect of low investment in equipment

Pending Publication Date: 2020-06-26
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a membrane method for separating and recovering hydrocarbon components (CH 4 、C 2 h 6 etc.) to solve the problem that traditional tail gas treatment methods cannot produce economic benefits and have an impact on the surrounding environment

Method used

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  • Membrane method low-temperature methanol washing tail gas treatment method and device
  • Membrane method low-temperature methanol washing tail gas treatment method and device
  • Membrane method low-temperature methanol washing tail gas treatment method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Such as figure 2 , put the low-temperature methanol washing device through CO 2 The tail gas decompressed to 0.2MPa in the flash tank is pressurized by a compressor to 1MPa, and the pressurized gas reaches 25°C after heat exchange. Exhaust gas CO 2 The concentration is 90%. After that, the tail gas enters the membrane separation unit. The membrane material of the membrane separation unit is polysulfone organic membrane, and the organic membrane module is in the form of hollow fiber, which has a very high packing density. The membrane module adopts the mixed connection method of multiple organic membrane modules (the raw material gas enters two sets of membrane modules respectively, one of which is one-stage and the other one is two-stage). The permeate side is kept at normal pressure. Under this condition, CO in the tail gas of the permeate side 2 The concentration is 98%, and the tail gas passes through the regenerative oxidation incinerator (RTO) to remove the h...

Embodiment 2

[0075] Such as image 3 , put the low-temperature methanol washing device through CO 2 Flash tank is decompressed to 0.8MPa tail gas, tail gas CO 2 The concentration is 40%. The exhaust gas is directly introduced into the membrane separation unit through the fan. The membrane material of the membrane separation unit is DD3R molecular sieve membrane. The pores of the DD3R molecular sieve membrane are uniform and orderly, and the inorganic material has excellent anti-aging performance. The molecular sieve membrane carrier is in the form of 4-channel hollow fiber, which has both high mechanical strength and high packing density. The vacuum on the permeate side is maintained at 90kPa by a vacuum pump.

[0076] Under this condition, the CO on the permeate side 2 The concentration is 99%, which can be discharged after being treated by catalytic oxidation combustion (CO). Retentate side CO 2 The concentration of the gas is 5%, and the hydrocarbon component is greater than 93%. T...

Embodiment 3

[0078] Such as Figure 4 , put the low-temperature methanol washing device through CO 2 The tail gas decompressed to 0.4MPa in the flash tank is pressurized by a compressor to 0.8MPa. Exhaust gas CO 2 The concentration is 65%. After that, the tail gas enters the membrane separation unit, and the membrane materials of the membrane separation unit are polyimide organic membrane and DD3R inorganic molecular sieve membrane. The organic membrane module is in the form of hollow fiber filaments with extremely high packing density, and the inorganic molecular sieve membrane has very high separation selectivity. The membrane module adopts a series connection of two-stage membrane modules. The front-stage membrane module adopts hollow fiber organic membrane, and the rear-stage membrane module adopts inorganic molecular sieve membrane. Under this condition, CO in the tail gas of the permeate side 2 The concentration is greater than 99%, and the tail gas removes combustible gas compo...

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Abstract

The invention discloses a novel process for recycling membrane-method low-temperature methanol washing tail gas. According to the method, combustible components such as carbon dioxide and hydrocarbonsare separated through membrane separation, effective gas recycling is achieved, the content of the hydrocarbon components in the discharged waste gas is reduced, and the hydrocarbon recovery rate ofthe low-temperature methanol washing process is increased. According to the method, high-value hydrocarbon and other combustible components are recycled, and remarkable economic benefits are generated; and meanwhile, carbon dioxide in the discharged waste gas is separated, so that the treatment pressure of an oxidative combustion section is greatly reduced, and the up-to-standard discharge requirement is ensured. The process is composed of one or more membrane separation assemblies, the gas on the permeation side is directly conveyed to a product pipeline, the gas on the permeation side is ledto an oxidation combustion section for subsequent treatment, the operation process is simple and convenient, the investment cost is low, and the production benefit is remarkable.

Description

technical field [0001] The invention relates to a method for treating hydrocarbon-containing tail gas, in particular to a method for separating and recovering hydrocarbon components from low-temperature methanol washing tail gas by membrane separation. Background technique [0002] The low-temperature methanol washing process is widely used in purification processes such as coal-to-natural gas, coal-to-methanol, and coal-to-oil. The process absorbs and dissolves through the methanol liquid at low temperature (-50°C), and the H in the raw gas 2 S, CO 2 and other acidic gases, as well as various organic sulfides, NH 3 、C 2 h 2 、C 3 and C 3 The above gaseous hydrocarbons, colloids and water vapor, etc., so as to achieve the purpose of purifying the raw gas. After washing with low-temperature methanol, it is necessary to go through steps such as flash evaporation, stripping, and heat treatment to release impurity gases dissolved in methanol, and regenerate methanol for ...

Claims

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Application Information

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IPC IPC(8): G06F16/27G06F16/22
CPCG06F16/27G06F16/2282
Inventor 顾学红宋洁玉王学瑞杜鹏李来所余浩许云
Owner NANJING UNIV OF TECH
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