Methane purifying method and equipment thereof

A biogas and equipment technology, which is applied in the field of biogas for dust removal, oxygen and water, carbon dioxide, and hydrogen sulfide removal, can solve the problems of not being able to remove oxygen, etc., and achieve significant economic benefits, environmental friendliness, and good product quality.

Active Publication Date: 2012-07-11
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention overcomes the disadvantage that the existing biogas purification technology cannot remove oxygen, and provides a biogas purification method and equipment for removing dust, hydrogen sulfide, carbon dioxide, oxygen and moisture in biogas, so as to facilitate efficient and clean utilization of biogas methane gas in

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  • Methane purifying method and equipment thereof
  • Methane purifying method and equipment thereof

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Embodiment 1

[0031] Biogas purification method of the present invention comprises the following steps:

[0032] 1. Use a booster fan to raise the biogas pressure to 1.02 to 1.55 atmospheres;

[0033] 2. Filter to remove dust and impurities, and the filter mesh diameter of the filter used is 0.01-2mm;

[0034] 3. Biological desulfurization, using biological desulfurization bacteria as a desulfurizing agent, converting hydrogen sulfide into elemental sulfur, reducing the concentration of hydrogen sulfide in biogas to below 300ppm;

[0035] 4. Deoxidation, the biogas after deoxidation of hydrogen sulfide is heated to 150-400°C in the preheater, and then enters the fixed-bed reactor filled with deoxidation catalyst, and the reaction of oxygen and methane gas occurs to make O 2 The volume concentration is reduced to below 0.5%. Then enter the cooler, the temperature is reduced to 30 ~ 80 ℃;

[0036] 5. Pressurize to make the biogas pressurized to 0.5 ~ 3MPa;

[0037] 6. Decarbonation, inclu...

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Abstract

The invention relates to a methane purifying method, comprising working procedures of pressurizing, filtering, biological desulphurizing, deoxidizing, absorbing, dehydrating, compressing, canning and the like. The implementation equipment of the methane purifying method comprises a fan used for conveying methane, a first filter, a biological desulphurization tank, a deoxidizing device, a first compressor used for increasing air pressure in a runner, a buffer tank, a filler tower used for absorbing carbon dioxide and hydrogen sulphide, a freeze drying machine, a fixed bed dehydrating device, a second compressor used for compressing purified methane and a purified methane storage tank which are sequentially connected. Two steps of absorption and adsorption are carried out to remove carbon dioxide and hydrogen sulphide, the advantages of low tower height and stable operation are realized, fixed bed catalytic deoxidation is adopted, and safety of the purified methane is greatly improved; meanwhile, less pollutant is discharged, thus the methane purifying method is more environmentally friendly, and methane yield is higher. The invention belongs to the fields of chemical engineering and technology, agricultural and forestry waste utilization, renewable energy source and the like.

Description

(1) Technical field [0001] The invention relates to a biogas purification method and equipment, in particular to a method and facility for dedusting biogas, removing hydrogen sulfide, carbon dioxide, oxygen and water. The purified biogas can be used as vehicle gas or infused with natural gas, which belongs to the fields of chemical engineering and technology, utilization of agricultural and forestry waste, and renewable energy. (2) Background technology [0002] Biogas obtained by anaerobic fermentation of biomass, or biogas, has a methane content of about 65%, and also contains 30-35% carbon dioxide, 1-12g / L hydrogen sulfide, and a small amount of water, organic sulfur, oxygen, etc. Hydrogen sulfide is not only poisonous, but also causes corrosion to equipment and pipelines; CO 2 High content reduces the calorific value of biogas; resulting in limited use of biogas and low efficiency. If the biogas is purified to meet the standards of vehicle gas (volume fraction of carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 计建炳刘学军高升
Owner ZHEJIANG UNIV OF TECH
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