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Biological desulfurization process for biogas

A biological desulfurization and biogas technology, applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of inability to achieve biogas desulfurization and removal effects, complex processes, etc., to ensure long-term operation, simplify desulfurization process, and high removal rate Effect

Inactive Publication Date: 2009-12-16
李旭源
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually after acidic biological desulfurization, the removal effect required by biogas desulfurization cannot be achieved, and further dry desulfurization is required, and the process is complicated

Method used

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  • Biological desulfurization process for biogas
  • Biological desulfurization process for biogas
  • Biological desulfurization process for biogas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 Effect of pH value of absorption solution on H in biogas 2 Influence of S removal effect

[0038] Methane gas accounts for about 60% of the biogas used in the experiment, and the rest is carbon dioxide, hydrogen sulfide, water vapor and other impurity gases. 2 S content: 5000mg / l, biogas pressure: 1.5KPa (15cm water column).

[0039] The temperature of the absorption liquid is 27°C, the dissolved oxygen is 0.75 mg / L, and the gas-liquid volume ratio of the biogas to the absorption liquid is controlled in the absorption tower to be 15:1.

[0040] The absorption tower has a height of 6 meters and a diameter of 0.6 meters. The ratio of height to diameter is 10:1 (the ratio can be reduced when the flow rate is large, but the tower needs to be divided vertically to avoid short circuit) Packing height: 2 meters. The filler used is trapezoidal plastic particles with a particle size of 10 mm.

[0041] Method: By changing the pH value of the absorption liquid, measu...

Embodiment 2

[0043] Example 2 Absorption solution temperature versus H 2 Effect of S removal rate

[0044] Methane gas accounts for about 60% of the biogas used in the experiment, and the rest is carbon dioxide, hydrogen sulfide, water vapor and other impurity gases. 2 S content: 5000mg / l, biogas pressure: 1.5KPa (15cm water column).

[0045]The temperature and pH value of the absorption liquid is 7.6, the dissolved oxygen is 0.75 mg / L, and the gas-liquid volume ratio of the biogas to the absorption liquid is controlled by the absorption tower to be 15:1.

[0046] The condition of absorption tower is the same as embodiment 1.

[0047] Method: By changing the temperature of the absorption liquid, the H in the biogas from the top of the tower 2 concentration of S and calculate the H 2 S removal rate, the results are shown in image 3 .

[0048] Depend on image 3 It can be seen that when the temperature of the absorbing liquid is low, the removal rate is low, but when the temperature ...

Embodiment 3

[0049] Example 3 Gas-liquid ratio vs. H 2 Effect of S removal rate

[0050] Methane gas accounts for about 60% of the biogas used in the experiment, and the rest is carbon dioxide, hydrogen sulfide, water vapor and other impurity gases. 2 S content: 5000mg / l, biogas pressure: 1.5KPa (15cm water column).

[0051] The pH value of the absorption solution is 7.6, the temperature is 27°C, and the dissolved oxygen is 0.75mg / L.

[0052] The condition of absorption tower is the same as embodiment 1.

[0053] The method is to adjust the gas-liquid ratio by changing the biogas intake amount of the absorption tower, and measure the H in the biogas coming out of the top of the tower under different gas-liquid ratio conditions. 2 concentration of S and calculate the H 2 S removal rate, the results are shown in Figure 4 .

[0054] Depend on Figure 4 It can be seen that the higher the gas-liquid ratio of H 2 The removal rate of S is lower. Therefore, it is ideal to choose a temper...

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Abstract

A biological desulfurization process for biogas comprises the following steps: contacting and reacting absorption solution which has a pH value of 7.5 to 8.0 and contains biological desulfurizing bacteria with the biogas first; aerating the reaction solution and keeping the dissolved oxygen concentration of the reaction solution between 0.50 and 1.25 mg / L; transforming sulfur element in the adsorption solution into monomer sulfur; and recycling the absorption solution which is obtained after the settlement separation of the monomer sulfur and maintains the dissolved oxygen concentration of 0.05 to 1.25 mg / L. The process avoids further desulfurization by a dry method or wet method and is simple and convenient to operate.

Description

technical field [0001] The invention relates to biogas biodesulfurization technology. Background technique [0002] Biogas is biomass energy and belongs to renewable energy. Biogas contains H 2 S, under hot and humid conditions, it is very corrosive to metal pipes, gas storage cabinets and gas equipment. And when biogas is burned, H 2 S also converts to SO 2 and SO 3 , will not only pollute the environment, but also corrode the equipment, so the biogas needs to remove the H contained in it before use 2 S. [0003] The current biogas desulfurization technology mainly has the following three methods: [0004] (1) There is dry desulfurization: in the dry desulfurization tower, the desulfurizer iron oxide and H 2 Reaction of S to remove H from biogas 2 S. However, the desulfurizer will fail after repeated use, and the waste generated will cause secondary pollution. [0005] (2) Wet desulfurization: In the wet scrubber, the H in the biogas is absorbed by the alkaline l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 李旭源
Owner 李旭源
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