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Biological purifying process of unconventional gas

A technology of unconventional natural gas and process method, applied in the field of unconventional natural gas resource purification, can solve the problems of complex process, secondary pollution and high energy consumption, and achieve the effects of stable gas quality, good purification effect and high purification purity.

Inactive Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This biological purification process realizes the purification and removal of carbon dioxide and hydrogen sulfide in unconventional natural gas resources, and simultaneously produces elemental sulfur and carbon dioxide to solve the problems of large investment, high energy consumption, complicated process and secondary pollution existing in existing physical and chemical methods. And other issues

Method used

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  • Biological purifying process of unconventional gas
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Examples

Experimental program
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Effect test

Embodiment 1

[0035] Example 1: Biogas biological desulfurization & biological decarbonization process

[0036] Biogas to be purified from biomass fermentation in a biogas plant, with a processing capacity of 30,000 Nm 3 / h, the pressure is 3.0 KPa, CO 2 35%, H 2 S 0.5%.

[0037] Using the present invention, the absorbent for biological desulfurization is Na 2 CO 3 / NaHCO 3 The pH of the buffer solution is 8.7, the concentration of the biological desulfurization catalyst Thiobacillus naples is 300mg / L, the biological regeneration temperature is 30℃; the biological decarburization absorbent is a mixture of 45% glutamic acid and 5% piperazine, biological decarburization The concentration of the catalyst carbonic anhydrase is 300mg / L, the decarburization absorption temperature is 40°C, and the desorption temperature is 80°C. Purifying temperament H 2 S 2 Content is less than 1.5%, regenerated CO 2 The content is more than 99.5%, and the sulfur recovery rate is 95%.

Embodiment 2

[0038] Example 2: CBM biological desulfurization & biological decarbonization process

[0039] The processing capacity of CBM to be purified is 50,000 Nm 3 / h, the pressure is 1.2MPa, CO 2 28%, H 2 S 5.0%.

[0040] Using the present invention, the absorbent for biological desulfurization is Na 2 CO 3 / NaHCO 3 The pH of the buffer solution is 9.0, the concentration of the biological desulfurization catalyst Thiobacillus denitrificans is 1000 mg / L, the biological regeneration temperature is 35 ℃; the biological decarbonization absorbent is a mixture of 45% valine and 5% piperazine, biological desulfurization The carbon catalyst carbonic anhydrase concentration is 1200mg / L, the decarburization absorption temperature is 40°C, and the desorption temperature is 75°C. Purifying temperament H 2 S 2 Content is less than 1.5%, regenerated CO 2 The content is more than 99.5%, and the sulfur recovery rate is 95%.

Embodiment 3

[0041] Example 3: Natural gas hydrate biological desulfurization & biological decarbonization process

[0042] The processing capacity of natural gas hydrate to be purified is 40,000 Nm 3 / h, the pressure is 5.0MPa, CO 2 35%, H 2 S 1.5%.

[0043] Using the present invention, the absorbent for biological desulfurization is Na 2 CO 3 / NaHCO 3 The pH value of the buffer solution is 8.8, the concentration of the biological desulfurization catalyst Thiobacillus excretion is 600mg / L, and the biological regeneration temperature is 30℃; the biological decarbonization absorbent is a mixture of 45% dimethylglycine and 5% piperazine. The carbonic anhydrase concentration of the decarburization catalyst is 800 mg / L, the decarburization absorption temperature is 35°C, and the desorption temperature is 75°C. Purifying temperament H 2 S 2 Content is less than 1.5%, regenerated CO 2 The content is more than 99.5%, and the sulfur recovery rate is 95%.

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Abstract

The invention is applied to the field of unconventional gas purification, concretely relates to a biological purifying method of unconventional gas, in order to realize simultaneous removing of CO2 and H2S in unconventional gas with combined production of carbon dioxide and elemental sulfur, and belongs to the category of green, low carbon and biological environmental protection. Skid-mounted modularization, high efficiency microbial community, a high efficiency biological decarburization absorbent, a bioreactor, and other products, technologies and equipment are used, two processes including biological desulphurization and biological decarburization are employed, and the purposes of unconventional gas purification, carbon dioxide recovery, and elemental sulfur recovery are realized, so that problems of purification treatment for H2S and CO2 in unconventional gas are effectively solved; the purposes of cleaning production, and recovery of elemental sulfur and carbon dioxide with added values are realized, and unification of resource benefits and environment benefits is achieved.

Description

Technical field [0001] An unconventional natural gas biological purification process used to remove hydrogen sulfide and carbon dioxide from unconventional natural gas such as coalbed methane, shale gas, water-soluble gas, natural gas hydrate, inorganic gas, shallow biogas, and tight sandstone gas The process of purifying and co-producing elemental sulfur and carbon dioxide belongs to the technical field of unconventional natural gas resource purification. Background technique [0002] Unconventional natural gas refers to hydrocarbon (or non-hydrocarbon) resources that are different from conventional natural gas in terms of accumulation mechanism, occurrence state, distribution law, or exploration and development methods. Its main components are methane and a small amount of ethane and butane. Alkane, pentane, carbon dioxide, hydrogen sulfide, nitrogen, and water. Unconventional natural gas resources mainly include coalbed methane, shale gas, water-soluble gas, natural gas hydra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 孔京郝爱香毛松柏孔凡敏
Owner CHINA PETROLEUM & CHEM CORP
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