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

A biological natural gas and biological desulfurization technology, applied in chemical instruments and methods, inorganic chemistry, gas fuels, etc., can solve the problems of hydrogen sulfide and carbon dioxide that have not been solved very well, restricting efficiency, etc., to achieve selective absorption, Energy saving and safety, the effect of reducing usage

Active Publication Date: 2012-12-12
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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...

Method used

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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
Comparison scheme
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 field of environmental engineering and biochemical engineering, in particular to a method and a device for recovery coupling of biological sulfur and carbon dioxide for producing biogas. The method comprises the following steps of (1) using an alkali absorption liquid to absorb hydrogen sulfide and converting hydrogen sulfide into sulfide after coarse methane is subjected to dust removing treatment, using sulfur-oxidizing bacteria to oxidizing the sulfide into elemental sulfur, separating the elemental sulfur and mother solution, adjusting pH of the mother solution to be alkaline mother solution for absorbing the hydrogen sulfide again and simultaneously obtaining methane without the hydrogen sulfide; and (2) performing deep dehydration to the methane without the hydrogen sulfide and obtained in the step (1), and adopting a polyimide or cellulose acetate organic polymeric membrane to separate methane and carbon dioxide in a finally-obtained gas mixture to obtain high-purity carbon dioxide and biogas methane. By means of the method, the biogas is prepared through the methane, the biological sulfur and the high-purity carbon dioxide are obtained, and the economic benefit of the methane is improved through the biogas, the biological sulfur and the high-purity carbon dioxide.

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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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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