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Method for preparing methane by deeply purifying landfill gas

A landfill gas and methane production technology, applied in the direction of adsorption purification/separation, waste fuel, organic chemistry, etc., can solve the problems of weak PSA research, increased hydrogen consumption, increased operating costs, etc., to achieve low operating costs and equipment Compact, adaptable effect

Active Publication Date: 2012-09-05
山东泰正和科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN101219919A adopts palladium catalytic hydrodeoxygenation method in the landfill gas purification, increases the consumption of hydrogen in the process, increases the operating cost, and the methane concentration of the obtained product gas is 90%-95%
The current pressure swing adsorption (PSA) system is still unable to meet the requirements of higher purity products of more than 99%, and the product gas contains a small amount of nitrogen, oxygen and carbon dioxide
CH at home and abroad 4 CH for the product 4 / N 2 Systematic PSA research has also been very weak

Method used

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  • Method for preparing methane by deeply purifying landfill gas
  • Method for preparing methane by deeply purifying landfill gas

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Embodiment 1

[0066] The present invention includes process steps such as compression desulfurization, pressure swing adsorption decarburization, deep drying and purification, and pressure swing adsorption denitrification and oxygen removal, and its flow chart is as follows figure 1 shown. The specific content of the present invention is described as follows:

[0067] Landfill gas treatment capacity 100Nm 3 / h, its main components are: methane 56.8%, carbon dioxide 38.2%, oxygen 0.7%, H 2 The S content is 56ppm, the CO content is 20ppm, and the total amount of other impurity gases is 4.3%. After the normal-pressure landfill gas is compressed to 0.4MPa, the gas enters the desulfurization unit to remove sulfur-containing gas, some moisture, impurity particles, a small amount of acid gas and oil in the landfill gas. After desulfurization, the gas enters the first-stage pressure swing adsorption decarburization system. The pressure swing adsorption system consists of two adsorption towers. T...

Embodiment 2

[0069] Landfill gas treatment capacity 300Nm 3 / h, its main components are: methane 55.6%, carbon dioxide 39.7%, oxygen 0.9%, H 2 The S content is 36ppm, the CO content is 44ppm, and the total amount of other impurity gases is 3.8%. After the atmospheric pressure landfill gas is compressed to 0.8MPa, the gas enters the desulfurization unit to remove sulfur-containing gas, some moisture, impurity particles, a small amount of acid gas and oil in the landfill gas. After desulfurization, the gas enters the first-stage pressure swing adsorption decarburization system. The pressure swing adsorption system is composed of 4 adsorption towers. The adsorbent is activated alumina / silica gel / molecular sieve with a ratio of 2:6:1, and the adsorption pressure is 0.8MPa. , the adsorption temperature is 30°C, and the intake air adsorption is stopped before the bed penetrates. After the adsorption tower is equalized twice, the adsorption tower is depressurized in reverse and vacuumed to -0.06...

Embodiment 3

[0071] Landfill gas treatment capacity 500Nm 3 / h, its main components are: methane 57.2%, carbon dioxide 35.1%, oxygen 0.8%, H 2 The S content is 49ppm, the CO content is 12ppm, and the total amount of other impurity gases is 6.9%. After the normal-pressure landfill gas is compressed to 1.2MPa, the gas enters the desulfurization unit to remove sulfur-containing gas, some moisture, impurity particles, a small amount of acid gas and oil in the landfill gas. After desulfurization, the gas enters the first-stage pressure swing adsorption decarburization system. The pressure swing adsorption system consists of 6 adsorption towers and 1 pressure equalization tank. The adsorbent is activated alumina / silica gel / carbon with a ratio of 2:8:1. Molecular sieve, the adsorption pressure is 1.2MPa, and the adsorption temperature is 30°C. During operation, two adsorption towers are in the adsorption state at the same time and the intake air adsorption is stopped before the bed is penetrated...

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Abstract

The invention discloses a method for preparing methane by deeply purifying landfill gas, which adopts pressure varying adsorption method to remove nitrogen and oxygen contained in the landfill gas. The method utilizes the pressure varying adsorption method to separate a small quantity of N2 and O2 from the landfill gas; and the process is simple, the equipment is compact, the operation cost is low and the applicability is high. Simultaneously, the method does not use catalyst hydrogenation for removing oxygen so as to prevent hydrogen from entering purified methane. The methane obtained by themethod has high purity which is greater than or equal to 99 percent; and organic impurities can be fundamentally removed and then the purity of methane can meet the application requirement of higher purity methane.

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 for purifying methane from landfill gas. Background technique [0002] Landfill gas (LFG) is one of the degradation products of sanitary landfills. The composition of landfill gas is complex, except for the main component CH 4 , CO 2 In addition, there are more than 140 other substances that have been detected, including N 2 , O 2 、H 2 S, H 2 O, high-boiling impurity sulfide, chloride, etc., and some other trace volatile organic impurities (VOCs for short) with extremely low content (total volume concentration less than 1%), such as chlorinated hydrocarbons, benzene series, halogenated hydrocarbons Wait. According to the United Nations, 148 million tons of garbage are filled into landfills across China every year, and each ton of garbage can generate about 100 to 200m3 during the life of the landfill....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C9/04C07C7/12
CPCY02E50/346Y02E50/30
Inventor 邓舟夏洲胡益铭
Owner 山东泰正和科技发展有限公司