Method for purifying and reclaiming carbon dioxide from landfill gas and device thereof

A landfill gas and carbon dioxide technology, applied in chemical instruments and methods, separation methods, liquefaction, etc., can solve problems affecting the environment, waste of resources, complex composition of landfill gas, etc., achieve a wide range of applications and avoid environmental pollution Effect

Inactive Publication Date: 2010-02-10
北京健坤伟华新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is less recovery and utilization of carbon dioxide in landfill gas (LFG), the main reason being that the composition of landfill gas is relatively complex, and relatively speaking, CO in landfill

Method used

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  • Method for purifying and reclaiming carbon dioxide from landfill gas and device thereof
  • Method for purifying and reclaiming carbon dioxide from landfill gas and device thereof
  • Method for purifying and reclaiming carbon dioxide from landfill gas and device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0063] After desulfurization, deoxidation, compression and other pretreatment steps, the feed gas enters the first-stage pressure swing adsorption unit, the adsorption pressure is 0.3MPa, the adsorption time is 100s, and then the gas containing 91% CH 4 The adsorbed gas is collected from the top of the tower; the pressure in the tower is equalized, reversed, and reduced to normal pressure, and the CO in the desorbed gas obtained from the bottom of the tower 2 The content is 70%, the remainder is N2, O2 and CH 4 ; The desorbed gas enters the two-stage PSA unit, the operating conditions are the same as that of the program, the adsorbed gas is discharged from the top of the tower, and the CO in the desorbed gas discharged from the bottom of the tower is 2 Increase to 91%, continue to use rectification for purification, and finally obtain food-grade liquid CO with a purity of 99.993% 2 .

Embodiment 2

[0065] After desulfurization, deoxidation, compression and other pretreatment steps, the feed gas enters the primary pressure swing adsorption unit, the adsorption pressure is 1.2MPa, the adsorption time is 280s, and then the gas containing 93% CH 4 The adsorbed gas is collected from the top of the tower; the pressure in the tower is equalized, reversed, and reduced to normal pressure, and the CO in the desorbed gas obtained from the bottom of the tower 2 The content is 73%, the remainder is N2, O2 and CH 4 ; The desorbed gas enters the two-stage PSA unit, the operating conditions are the same as that of the program, the adsorbed gas is discharged from the top of the tower, and the CO in the desorbed gas discharged from the bottom of the tower is 2 Increase to 92%, continue to use rectification for purification, and finally obtain food-grade liquid CO with a purity of 99.996% 2 .

Embodiment 3

[0067] After desulfurization, deoxidation, compression and other pretreatment steps, the feed gas enters the primary pressure swing adsorption unit, the adsorption pressure is 2.0MPa, the adsorption time is 300s, and then the gas containing 95% CH 4 The adsorbed gas is collected from the top of the tower; the pressure in the tower is equalized, reversed, and reduced to normal pressure, and the CO in the desorbed gas obtained from the bottom of the tower 2 The content is 77%, the remainder is N2, O2 and CH 4 ; The desorbed gas enters the two-stage PSA unit, the operating conditions are the same as that of the program, the adsorbed gas is discharged from the top of the tower, and the CO in the desorbed gas discharged from the bottom of the tower is 2 Increase to 93%, continue to use rectification for purification, and finally obtain food-grade liquid CO with a purity of 99.999% 2.

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Abstract

The invention discloses a method for purifying and reclaiming CO2 (carbon dioxide) from landfill gas (LFG) and a device thereof. The method comprises the following steps: separating CO2 from the pre-treated landfill gas through primary pressure swing absorption (PSA); then, obtaining purified CO2 through secondary or multistage PSA; and finally, purifying through liquefaction and flash evaporationor rectification. Since CO2 and CH4 (methane) in the pre-treated landfill gas are different in the absorbability of the absorption material, the method can purify CO2 and reclaim CH4 from the landfill gas as the raw material at the same time. The device of the invention has the advantages of high explosion resistance and good separation effect; and the purity of CO2 can achieve the industrial oranalytical grade through liquefaction and flash evaporation or rectification.

Description

technical field [0001] The invention relates to the fields of mixed gas separation, purification and renewable energy recovery and utilization, in particular to a process method and device for purifying and recovering carbon dioxide from landfill gas. Background technique [0002] Carbon dioxide has high civil and industrial value and is widely used in many fields, so it is a very precious resource. At present, carbon dioxide is not only widely used in petroleum exploration, metallurgy, welding, low-temperature cold coal, machinery manufacturing, artificial rainfall, fire protection, chemical industry, papermaking, agriculture, food industry, medical and health care, etc., but also in supercritical solvents, bioengineering, etc. , laser technology, nuclear industry and other cutting-edge high-tech fields. The new uses developed in recent years, such as vegetable fertilizer, vegetable and meat preservation, and the production of degradable plastics, also show good developmen...

Claims

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Application Information

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IPC IPC(8): C01B31/20B01D53/04F25J3/02C01B32/50
CPCY02E50/346Y02A50/20Y02E50/30
Inventor 邓舟夏洲胡益铭张妍田玲
Owner 北京健坤伟华新能源科技有限公司
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