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Method and device for recovery coupling of biological sulfur and carbon dioxide for producing biogas

A bio-natural gas and bio-desulfurization technology, applied in chemical instruments and methods, inorganic chemistry, gas fuel, etc., can solve the problems of restricting efficiency, hydrogen sulfide and carbon dioxide that have not been solved, and achieve energy saving, safety, and realization Selective absorption and high recovery of total sulfur

Active Publication Date: 2014-09-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0007] Therefore, the separation of hydrogen sulfide and carbon dioxide in the process of producing biogas from biogas has not yet been fully resolved, which restricts the efficiency of this method in industrial production and becomes a bottleneck restricting the industry of biogas to bionatural gas. Solve the above problems, thereby It is of great significance to realize the simple and efficient separation of hydrogen sulfide and carbon dioxide

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  • Method and device for recovery coupling of biological sulfur and carbon dioxide for producing biogas
  • Method and device for recovery coupling of biological sulfur and carbon dioxide for producing biogas
  • Method and device for recovery coupling of biological sulfur and carbon dioxide for producing biogas

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1 methane / carbon dioxide / hydrogen sulfide mixed gas treatment

[0049] Mixed gas: Under standard conditions, methane, carbon dioxide, and hydrogen sulfide are mixed in a volume ratio of 60:37:3, simulating the composition of biogas, and the processing capacity is 0.01Nm 3 / d.

[0050] The mixed gas enters the hydrogen sulfide absorption tower at a space velocity of 2m / S and a pressure of 0.2 Mpa, the contact time is 0.2±0.1s, Na 2 CO 3 / NaHCO 3 The pH value of the absorption liquid is 8.0, and the liquid-gas ratio is 3L / m 3 .

[0051] The rich liquid containing sulfide in the absorption tower enters the biological desulfurization reactor. Under the condition of ORP=-150mV±10, the sulfide is converted into elemental sulfur by sulfur-oxidizing bacteria. Elemental sulfur flows out with the effluent of the biological desulfurization reactor, and is collected by settling in the sedimentation tank.

[0052] The desulfurized raw gas is pressurized to 1.0Mpa b...

Embodiment 2

[0058] Example 2 Biogas production by anaerobic digestion of corn stalks

[0059] Corn stalks and cow dung were mixed in a ratio of 1:5 for anaerobic fermentation to produce biogas.

[0060] Main components of biogas: methane 48.9-57.1%, carbon dioxide 32.1-36.3%, hydrogen sulfide 0.1-0.2%. The gas production rate is 1.6-2.1Nm 3 / d.

[0061] After the biogas is dedusted, it enters the hydrogen sulfide absorption tower at a space velocity of 4m / S and a pressure of 0.2Mpa. The contact time is 0.4±0.1s, and the Na 2 CO 3 / NaHCO 3 The pH value of the absorption liquid is 7.0-8.0, and the liquid-gas ratio is 2-3L / m 3 .

[0062] The rich liquid containing sulfide in the absorption tower enters the biological desulfurization reactor. Under the condition of ORP=-150mV±10, the sulfide is converted into elemental sulfur by sulfur-oxidizing bacteria. Elemental sulfur flows out with the effluent of the biological desulfurization reactor, and is collected by settling in the sedimen...

Embodiment 3

[0069] Example 3 High hydrogen sulfide biogas produced by anaerobic treatment of high sulfate-containing wastewater of straw pretreated with dilute acid

[0070] Methane 40.2-44.3%, carbon dioxide 34.1-38.3%, hydrogen sulfide 2.2-2.7%. The gas production rate is 0.3-0.5Nm 3 / d.

[0071] After the biogas is dedusted, it enters the hydrogen sulfide absorption tower at a space velocity of 2m / S and a pressure of 0.2Mpa. The contact time is 0.4±0.1s, and the Na 2 CO 3 / NaHCO 3 The pH value of the absorption liquid is 7.5-8.0, and the liquid-gas ratio is 3-4L / m 3 .

[0072] The rich liquid containing sulfide in the absorption tower enters the biological desulfurization reactor. Under the condition of ORP=-150mV±10, the sulfide is converted into elemental sulfur by sulfur-oxidizing bacteria. Elemental sulfur flows out with the effluent of the biological desulfurization reactor, and is collected by settling in the sedimentation tank.

[0073] The desulfurized raw gas is pressu...

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Abstract

The invention relates to the fields of environmental engineering and biochemical industry, in particular to a method and device for coupling biological desulfurization and carbon dioxide recovery for the production of biological natural gas. The method comprises the following steps: 1) after the crude biogas is dedusted, the hydrogen sulfide is absorbed by an alkaline absorption liquid and converted into sulfide, the sulfur oxidizing bacteria oxidize the sulfide into elemental sulfur, and the elemental sulfur and mother liquor are separated, Adjusting the pH of the mother liquor to be alkaline is used to absorb hydrogen sulfide again, and at the same time obtain biogas from which hydrogen sulfide has been removed; 2) carry out deep dehydration to the biogas from which hydrogen sulfide has been removed in step 1), and finally use the obtained gas mixture to Polyimide or cellulose acetate organic polymer membranes separate methane and carbon dioxide to obtain high-purity carbon dioxide and bionatural gas methane. The method of the invention prepares biological natural gas through biogas, and obtains biosulfur and high-purity carbon dioxide, and the three products improve the economic benefits of biogas.

Description

technical field [0001] The invention relates to the fields of environmental engineering and biochemical industry, in particular, the invention relates to a method and device for coupling biological desulfurization and carbon dioxide recovery for producing biological natural gas. Background technique [0002] Natural gas is a clean fossil energy whose main component is methane. Compared with coal and oil, natural gas has the advantages of high calorific value and no emission of pollutants such as sulfur and nitrogen oxides. Accelerating the development of natural gas is the focus of my country's energy structure adjustment. By 2020, the proportion of natural gas in the energy structure will be increased from 3.4% in 2010 to 8%. my country is a country rich in coal, low in oil and short of gas. The world's proven remaining recoverable natural gas resources are 185 trillion cubic meters, while my country's proven remaining recoverable natural gas reserves are only 2.46 trilli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/10C01B31/20C01B17/02C01B32/50
CPCY02A50/20
Inventor 邢建民宋子煜李强王丹
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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