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A method for fractional concentration of low-concentration gas pressure swing adsorption

A low-concentration gas and pressure swing adsorption technology, which is applied in separation methods, adsorption purification/separation, and through adsorption, can solve problems such as waste of resources and the greenhouse effect, and achieve the effects of saving energy, reducing air pollution, and improving energy structure

Inactive Publication Date: 2011-12-28
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CH 4 The impact on the greenhouse effect of the atmosphere accounts for 15-20%. CH 4 for CO 2 It is 21 times stronger than molecular greenhouse effect, 7 times stronger than carbon dioxide in destroying the ozone layer, and CH 4 Emissions into the atmosphere, on the one hand, cause a serious waste of resources, and on the other hand, lead to the greenhouse effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for fractional concentration of low-concentration gas pressure swing adsorption, the steps of which are:

[0043] (1), gas pretreatment:

[0044] A. Dust removal: Use the gas dust removal filter to first remove dust from the gas:

[0045] Dust for equipment protection, maintenance and follow-up process CH 4 The regeneration of the gas adsorbent has a great influence, and a gas dedusting filter is set up to dedust the gas, reduce the corrosion of the equipment, and improve the separation effect; the CH 4 The gas adsorbent can be any one of zeolite molecular sieve, carbon molecular sieve or a combination of the two. The gas dust removal filter is a bag filter, which passes the dusty flue gas through the filter material, and the dust particles are filtered out. The filter material captures coarse dust mainly by inertial collision, and captures fine dust mainly by diffusion and sieving. The dust layer of the filter material also has a certain filtering effect. ...

Embodiment 2

[0061] Coal mine gas is dedusted, dewatered and CO depleted 2 Pretreatment (same example 1), pressure swing adsorption with any one of zeolite molecular sieve, carbon molecular sieve or its combination as CH 4 Gas adsorbent, the pressure of pressurized adsorption is 0.8 or 1.2 or 1.8 or 2.0 MPa, the pressure of decompression desorption is 0.1 or 0.08 or 0.06 or 0.04 MPa negative pressure, the temperature is 4 or 8 or 15 or 20 ° C, divided into 4 levels Concentrate to obtain methane gas with a concentration of 50 or 60 or 70 or 85 or 90 or 95 or 96%. Specifically:

[0062] A. The first pressure swing adsorption:

[0063] After the first pressure swing adsorption of dry gas, the methane concentration is 2 or 3%;

[0064] B. Rinse to avoid gas explosion limit:

[0065] Wash the product gas of step A with 30 or 40 or 50 or 60% methane gas, and increase the concentration of the product gas of step A to 20 or 30 or 40 or 50%, thereby effectively avoiding the gas explosion limit;...

Embodiment 3

[0073] Coal mine gas is dedusted, dewatered and CO depleted 2 Pretreatment (same example 1), pressure swing adsorption with any one of zeolite molecular sieve, carbon molecular sieve or its combination as CH 4 Gas adsorbent, the pressure of pressurized adsorption is 0.8 or 1.5 or 2.0 or 2.4 MPa, the pressure of decompression desorption is 0.1 or 0.08 or 0.06 or 0.04 MPa negative pressure, the temperature is 5 or 10 or 18 or 25 ° C, divided into 5 levels Concentrate to obtain methane gas with a concentration of 60 or 70 or 80 or 90 or 95 or 95.5 or 97%. Specifically:

[0074] A. The first pressure swing adsorption:

[0075] After the first pressure swing adsorption of dry gas, the methane concentration is 2 or 3%;

[0076] B. Rinse to avoid gas explosion limit:

[0077] Wash the product gas of step A with 30 or 40 or 50 or 60% methane gas, and increase the concentration of the product gas of step A to 20 or 30 or 40 or 50%, thereby effectively avoiding the gas explosion lim...

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Abstract

The invention discloses a method for the pressure swing adsorption and staged concentration of low concentration gas. The steps are as follows: (1) gas pretreatment: A. gas is processed by dust removal; B. dehydration, a drier is arranged for removing water in the gas before the gas is led into a pressure swing adsorption tower; C. CO2 removal, the pre-filtration is executed between the drier and a pressure swing adsorption device, the dynamics diameter of CO2 is 0.33nm and is comparatively low, a close meshed carbon molecular sieve is used as a CO2 adsorbent, and the CO2 is discharged out from methane and alkine at high selectivity; and (2) pressure swing adsorption and staged concentration of the dried gas: the low concentration methane is divided into 2 to 6 stages, 5 to 16 percent of gas explosive limit is avoided, 2 to 4 adsorption-desorption tower are exchanged for continuous concentration to prepare high concentration methane, and each adsorption-desorption tower is filled with 1 to 2 kinds of efficient CH4 adsorbents. The coefficient of recovery of methane exceeds 90 percent, the concentration of methane exceeds 95 percent, the methane has high calorific value, and the method has the advantages of discharge reduction of high greenhouse effect methane, energy conservation and emission reduction.

Description

technical field [0001] The invention relates to the technical field of separation and purification of industrial gases. More specifically, it relates to a low-concentration gas pressure swing adsorption graded concentration method, which is suitable for concentrating low-concentration gas into high-concentration methane gas. The product of the present invention, methane, can be used as a chemical raw material, civil gas, and automobile fuel, which can save a lot of energy. At the same time, it reduces the emission of methane (21 times that of carbon dioxide) gas with high greenhouse effect, and has the global environmental significance of energy-saving economy and emission reduction. Background technique [0002] Coal mine gas (called coalbed methane) is the associated gas of coal mines. The main components of coalbed gas are: methane (CH 4 ), carbon dioxide (CO 2 ), carbon monoxide (CO), ethylene (C 2 h 4 ), propane (C 2 h 6 ), where CO, C 2 h 4 、C 2 h 6 The conte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/047C07C7/12C07C9/04
CPCY02C10/08Y02C20/20Y02C20/40Y02P20/151
Inventor 李广学王剑波王震刘银曹从伟叶俊
Owner ANHUI UNIV OF SCI & TECH
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