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Mixed gas separation method and system

A technology of mixed gas and separation method, which is applied in the field of chemical industry, can solve the problems of low recovery rate of pressure swing adsorption process, high energy consumption of chemical absorption process, high energy consumption of membrane separation process, etc., so as to improve the flexibility of process operation, long working life, The effect of reducing energy consumption

Inactive Publication Date: 2016-08-17
CHENGDU ZHONGKE ENERGY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is low recovery rate of pressure swing adsorption process in the prior art, high energy consumption of chemical absorption process, high energy consumption of membrane separation process and short service life, etc., and a new pressure swing adsorption and membrane separation process is provided. Combined separation process of mixed gas

Method used

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  • Mixed gas separation method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] As per figure 1 The method shown separates the mixed gas. The composition of raw materials is shown in Table 1.

[0033] Table 1 Mixture composition table

[0034] Composition of raw materials

Mass composition (mol%)

CH 4

58

CO 2

40

N2

1

O2

0.2

H 2 O

0.8

[0035] The mixed gas is pressurized to 0.55MPa(G) by the mixed gas compressor, and the exhaust temperature is 40°C. It enters the adsorption tower. There are two adsorption towers. The adsorption and regeneration are performed alternately and continuous operation. The adsorbent is the adsorbent selected for carbon dioxide, and the adsorbent is regenerated by vacuum analysis. The adsorption pressure is 0.55MPa(G), the adsorption temperature is 40°C, and the analytical vacuum is -0.095MPa(G). After measurement, the methane content of the intermediate gas at the top of the adsorption tower is 85% (mol), and the desorption gas at the bottom of the tower is 97% (mol) of carbon dioxide.

[0036] After the intermediate p...

Embodiment 2

[0040] According to the method and steps described in Example 1, the mixed gas is pressurized to 0.80 MPa (G) by the mixed gas compressor, and the exhaust temperature is 60° C., and enters the adsorption tower. The adsorbent is an adsorbent selected for carbon dioxide, and the adsorbent is regenerated by vacuum analysis. The adsorption pressure is 0.80MPa(G), the adsorption temperature is 60℃, and the analytical vacuum is -0.1MPa(G). After measurement, the methane content of the intermediate gas at the top of the adsorption tower is 75% (mol), and the desorption gas at the bottom of the tower is 93% (mol) of carbon dioxide.

[0041] After the intermediate product gas at the top of the tower is pressurized to 4.0MPa(G) by the intermediate gas compressor, the temperature is cooled to 60℃ by the cooler, and then the solid particles and oil in the gas are completely filtered and removed by a multi-stage filter to obtain a clean The gas enters the membrane separation device. The mem...

Embodiment 3

[0045] According to the method and steps described in Example 1, the mixed gas is pressurized to 0.30 MPa (G) by the mixed gas compressor, and the exhaust gas temperature is 20° C., and enters the adsorption tower. The adsorbent is an adsorbent selected for carbon dioxide, and the adsorbent is regenerated by vacuum analysis. The adsorption pressure is 0.30MPa(G), the adsorption temperature is 20°C, and the analytical vacuum is -0.1MPa(G). After measurement, the methane content of the intermediate gas at the top of the adsorption tower is 95% (mol), and the desorption gas at the outlet of the tower bottom is 90% (mol) of carbon dioxide.

[0046] After the intermediate product gas at the top of the tower is pressurized to 1.0MPa(G) by the intermediate gas compressor, the temperature is cooled to 20℃ by the cooler, and then the solid particles and oil in the gas are completely filtered and removed by a multi-stage filter to obtain a clean The gas enters the membrane separation devi...

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Abstract

The invention provides a mixed gas separation method and system. The mixed gas separation method comprises the steps that step 1, mixed gas is pressurized and fed into an adsorption tower to be in contact with an adsorbent so as to utilize the adsorbent to adsorb at least one part of fission of a non-effective group; step 2, the adsorbent in the adsorption tower is used at a regeneration stage, and gas containing non-effective components is obtained; step 3, the intermediate product gas output from an outlet of the adsorption tower in the step 1 is compressed to reach the working pressure of a membrane separation device; step 4, the gas pressurized in the step 3 is cooled, then cooling is performed to preferably reach the temperature of 20-100 DEG C, and the gas is input into the membrane separation device after being filtered; step 5, the intermediate product gas is separated through the membrane separation device to obtain permeation gas and non-permeation gas, the permeation gas returns to the mixed gas in the step 1 to be recycled again, and the non-permeation gas serves as the product gas to be output. The mixed gas separation method has the advantages of being lower in energy consumption and high in target effective gas purity and yield.

Description

Technical field [0001] The invention relates to the field of chemical engineering, in particular to a mixed gas separation method and system. Background technique [0002] With the reform of the energy structure, the separation of pure gas with higher energy utilization value from different types of mixed gas, such as landfill gas, biogas, natural gas, synthetic tail gas, cracked gas, etc., is attracting wide attention. The presence of multiple temperament components in the mixed gas not only reduces its use value, but may also have certain safety hazards. Therefore, we must separate and purify the mixed gas to obtain a relatively pure single-component gas. [0003] The separation and purification of mixed gas generally adopts pressure swing adsorption (PSA) process, physical and chemical absorption process, membrane separation process, etc., but each process has its own characteristics and adaptability to different construction sites. [0004] The pressure swing adsorption process...

Claims

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Application Information

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IPC IPC(8): B01D53/047B01D53/22C10L3/10
CPCB01D53/047B01D53/225B01D53/228B01D53/229C10L3/10
Inventor 黄显波周一民罗仕忠龚琼沈思黄亚军
Owner CHENGDU ZHONGKE ENERGY & ENVIRONMENTAL PROTECTION CO LTD