System and technique for simultaneously purifying methane and carbon dioxide from marsh gas

A technology of carbon dioxide and biogas, applied in the direction of membrane purification/separation, hydrocarbon purification/separation, inorganic chemistry, etc., can solve the problems of aggravating the greenhouse effect and affecting the environment, and achieve the effect of simple process, high degree of automation and convenient operation

Inactive Publication Date: 2014-08-27
上海精腾新能源科技有限公司
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Problems solved by technology

[0002] In the current biogas purification process section, the CO in the tail gas 2 The purity of the gas is more than 90%, and the tail gas is generally discharged directly into the atmosphere, and a large amount of CO in the exhaust gas 2 and a small amount of CH 4 , the emission of this part of the gas will affect the environment and aggravate the greenhouse effect

Method used

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  • System and technique for simultaneously purifying methane and carbon dioxide from marsh gas
  • System and technique for simultaneously purifying methane and carbon dioxide from marsh gas
  • System and technique for simultaneously purifying methane and carbon dioxide from marsh gas

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Embodiment 1

[0052] Embodiment 1: Two-stage membrane separation process

[0053] A process for simultaneously purifying methane and carbon dioxide from biogas, comprising the following steps:

[0054] (1) After biogas raw material is desulfurized and dehydrated by biogas desulfurization dehydrator 1, it is compressed and pressurized to 1.35MPa by compressor I2, and then enters pretreatment device I, and passes through cold dryer I, filter group I (including 4 connected in series) Class filter) treatment, the filtration accuracy reaches 0.01μm / Nm3 for dust, 0.01mg / Nm3 for residual oil, less than 100ppm for ammonia or amine, H 2 S is less than 15ppm, then passes through the heater I, the temperature reaches 35°C, and enters the first-stage hollow fiber membrane 4 for CO 2 and CH 4 rough separation;

[0055] (2) Obtain CO at the permeate gas outlet of the first-stage hollow fiber membrane 4 2 Crude product (94% CO 2 , 4v% CH 4 , others are O 2 , N 2 etc.), the CH obtained from the non...

Embodiment 2

[0058] Embodiment 2: Three-stage membrane separation process

[0059] (1) Biogas raw materials are desulfurized and dehydrated by biogas desulfurization dehydrator 1, compressed and pressurized by compressor I2 to 1.0MPa, then enter pretreatment device I3, pass through cold dryer I11, filter group I12 (including series connected 4-stage filter) and heater Ⅰ13 pretreatment, the filtration accuracy reaches 0.01μm / Nm3 for dust, 0.01mg / Nm3 for residual oil, less than 100ppm for ammonia or amine, H 2 S is less than 15ppm, the temperature reaches 40°C, and then enters the first-stage hollow fiber membrane 4 for CO 2 and CH 4 rough separation;

[0060] (2) Obtain CO at the permeate gas outlet of the first-stage hollow fiber membrane 4 2 Crude product (90v% CO 2 , 8v% CH4, others are O 2 , N 2 etc.), through the compressor II8, compressed to 1.1MPa, enter the pretreatment device II9, after the pretreatment of the cold dryer II, the filter group II (including the 4-stage filter c...

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Abstract

The invention relates to a technique and system for simultaneously purifying methane and carbon dioxide from marsh gas. The technique comprises the following steps: after the marsh gas raw material is compressed and pressurized by a compressor I, entering a pretreatment device I to perform pretreatment; passing through a primary hollow fiber membrane to separate out a CH4 crude product and a CO2 crude product; carrying out deep purification on the CH4 crude product through a secondary hollow fiber membrane, and separating to obtain the CH4 product which satisfies the Vehicle Gas Standard GB18047-2000; and purifying the CO2 crude product with a CO2 recovery device, and separating to obtain the CO2 product which satisfies the Industrial Carbon Dioxide Standard GB/T6052-2011. The technique and system have the characteristics of simple technique, compact equipment structure, small equipment size, high degree of automation, high safety and reliability and wide application range, is convenient to operate, and can implement zero discharge due to the exhaust reflux design.

Description

technical field [0001] The invention relates to a device system and process for simultaneously purifying methane and carbon dioxide from biogas, in particular to a method for purifying CH from biogas 4 Simultaneous recovery of high-purity CO 2 devices and processes. Background technique [0002] In the current biogas purification process section, the CO in the tail gas 2 The purity of the exhaust gas is more than 90%, and the tail gas is generally discharged directly into the atmosphere, and a large amount of CO in the exhaust gas 2 and a small amount of CH 4 , the emission of this part of the gas will affect the environment and aggravate the greenhouse effect. [0003] Methane gas is one of the important factors affecting the greenhouse effect. The actual impact of CH4 gas is more than 20 times higher than that of CO2, and must be gradually controlled and reduced. Methane gas can only be effectively utilized if it is separated and purified. And after carbon dioxide is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/04C07C7/00C07C7/144C01B31/20C01B32/50
Inventor 周磊砢石锦绣
Owner 上海精腾新能源科技有限公司
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