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

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...

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