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Method for purifying and recycling methane and carbon dioxide from landfill gas and device thereof

A technology of carbon dioxide and landfill gas, which is applied in chemical instruments and methods, adsorption purification/separation, inorganic chemistry, etc., can solve problems such as waste, and achieve the effects of convenient operation, stable system, and low investment

Active Publication Date: 2010-04-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, landfill gas utilization methods mainly include power generation, city gas production, vehicle fuel, hot water steam, chemical raw materials, fuel cells, etc. However, no matter what the utilization method is, it is only for methane or As far as carbon dioxide is a single element, another main component is wasted while purifying one main component

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0070] The landfill gas pretreated by desulfurization, compression, filtration, etc. enters the first-stage pressure swing adsorption unit. The adsorption pressure of high-pressure adsorption is 0.3MPa, and the adsorption time is 50s (seconds). The CH in the adsorbed gas obtained from the top of the tower 4 The content is 70% (the remainder is N 2 , O 2 ); then pressure equalization, reverse release, down to normal pressure, CO in the desorption gas obtained from the bottom of the tower 2 The content is 95.2% (the remainder is N 2 , O 2 and CH 4 ). The high content of CH flowing out of the top of the tower 4 The gas enters a two-stage / multi-stage pressure swing adsorption unit to obtain CH with a purity of 99.2% 4 Products, tail gas reflux; high CO content outflow from the bottom of the tower 2 The gas is compressed, cooled to liquefaction, enters the flash tank, and flashes to obtain 99.9% CO 2 Product gas, flash gas reflux.

Embodiment 2

[0072] After desulfurization, compression, filtration and other pretreatments, the landfill gas enters the first-stage pressure swing adsorption unit. The adsorption pressure of high-pressure adsorption is 0.3MPa, and the adsorption time is 150s. The CH in the adsorbed gas obtained from the top of the tower 4 The content is 72% (the remainder is N 2 , O 2 ); then pressure equalization, reverse release, down to normal pressure, CO in the desorption gas obtained from the bottom of the tower 2 The content is 95.2% (the remainder is N 2 , O 2 and CH 4 ). The high content of CH flowing out of the top of the tower 4 The gas enters a two-stage / multi-stage pressure swing adsorption unit to obtain CH with a purity of 99.1% 4 Products, tail gas reflux; high CO content outflow from the bottom of the tower 2 The gas is compressed, cooled to liquefaction, enters the flash tank, and flashes to obtain 99.9% CO 2 Product gas, flash gas reflux.

Embodiment 3

[0074] After desulfurization, compression, filtration and other pretreatments, the landfill gas enters the first-stage pressure swing adsorption unit. The adsorption pressure of high-pressure adsorption is 0.3MPa, and the adsorption time is 280s. The CH in the adsorbed gas obtained from the top of the tower 4 The content is 73% (the remainder is N 2 , O 2 ); then pressure equalization, reverse release, down to normal pressure, CO in the desorption gas obtained from the bottom of the tower 2 The content is 96% (the remainder is N 2 , O 2 and CH 4 ). The high content of CH flowing out of the top of the tower 4 The gas enters a two-stage / multi-stage pressure swing adsorption unit to obtain CH with a purity of 99.3% 4 Products, tail gas reflux; high CO content outflow from the bottom of the tower 2 The gas is compressed, cooled to liquefaction, enters the flash tank, and flashes to obtain 99.9% CO 2 Product gas, flash gas reflux.

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Abstract

The invention discloses a device for purifying and recycling methane and carbon dioxide from landfill gas; the device comprises the following steps: the methane and carbon dioxide are separated out from the preprocessed landfill gas through one-level transformation adsorption, wherein the device comprises a preprocessing unit, a first level pressure swing adsorption unit, a multilevel pressure swing adsorption unit, and a carbon dioxide purification unit. In the invention, the CH4 and CO2 product gases with high purification are separated and purified from the landfill gas, the energy source is fully utilized, so as to prevent the landfill gas from being exhausted to the air directly and cause environment pollution and greenhouse effect; the device has the characteristics of high process automation degree, compact structure, desulfurization, dehydration and purification effect; in the device, the designed waste gas recirculation realizes zero discharge of the system.

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 method and device for purifying methane and carbon dioxide from landfill gas and various types of biogas. Background technique [0002] With the increase of my country's urban population and the improvement of people's living standards, the amount of urban waste generated continues to increase. In 2000, the amount of urban waste generated in my country was close to 140 million tons, and it was increasing at an annual rate of 8%. Garbage treatment includes various methods such as sanitary landfill, incineration, anaerobic digestion and aerobic composting. Among them, sanitary landfill is the most widely used waste treatment method in the world. At present, more than 95% of urban waste in my country is still used Landfill is used for disposal, and considering China's national conditions, landfill will still be the do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/04C07C7/12C01B31/20C01B32/50
CPCY02E50/346Y02E50/30
Inventor 王伟邓舟夏洲胡益铭田玲
Owner TSINGHUA UNIV
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