Gas Circulation Biological Bubble Tower Biogas/Natural Gas Biological Desulfurization Method

A gas circulation and biological desulfurization technology, which is applied in the field of biogas/natural gas biological desulfurization, can solve the problems of poor solubility of hydrogen sulfide, failure to meet the use standard, low desulfurization efficiency, etc., to reduce post-treatment costs, increase gas-liquid mass transfer, The effect of increasing desulfurization efficiency

Active Publication Date: 2021-09-24
SICHUAN UNIV
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  • Summary
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  • Claims
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Problems solved by technology

Commonly used biogas / natural gas biological desulfurization devices include biological trickling filter and biological filter, which have the advantages of high gas / liquid surface area ratio, high treatment efficiency, and easy removal of soluble products. However, when the products generated during the desulfurization process are mostly sulfur , elemental sulfur is insoluble in water, and will gradually accumulate on the surface of the reactor packing and microbial membrane, resulting in a large pressure loss in the bed and blockage of the bed, which reduces the desulfurization efficiency and fails to meet the use standard. Finally, the bed needs to be cleaned or replaced Reactor operation interrupted by filling
[0006] CN201110205352.7 discloses a method for simultaneous removal of nitrogen in wastewater and sulfur in biogas, which successfully realizes denitrification of pig farm wastewater and desulfurization of biogas by using a biological bubbling reactor; but it cannot selectively remove H 2 S is converted into elemental sulfur, and there is still a risk of secondary pollution. At the same time, due to the poor solubility and low mass transfer efficiency of hydrogen sulfide in the biological bubble column solution, the final desulfurization effect is poor.

Method used

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  • Gas Circulation Biological Bubble Tower Biogas/Natural Gas Biological Desulfurization Method
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  • Gas Circulation Biological Bubble Tower Biogas/Natural Gas Biological Desulfurization Method

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Effect test

Embodiment 1

[0049] use figure 1 The biological bubble column system shown ( figure 1 Middle---indicates the air path), the filler is a modified biological suspension filler, the material is polypropylene, and the density is 0.92g / cm 3 , the porosity is 84%, the specific surface area is 1200m 2 / m 3 , the filler volume is 0.25L, and the solution volume is 650mL. The simulated biogas (hydrogen sulfide content is about 0.5%) is made by mixing two kinds of cylinder gases according to a certain ratio: (1) ordinary nitrogen (N 2 ≥99.5%); (2)H 2 S standard gas (H 2 About 10% S, the rest is N 2 ). O required for biological desulfurization 2 Supplied by an air pump, the air and simulated biogas are evenly mixed and then enter the reactor. The gas flow rate of the inlet pipe of the reactor is the same as the gas flow rate of the outlet pipe. The composition of the nutrient solution is shown in Table 1, adding NaHCO 3 As an inorganic carbon source for desulfurization bacteria (in actual pr...

Embodiment 2

[0062] use figure 1 The biological bubble tower system shown is filled with modified biological suspension filler, made of polyethylene, and the density is 0.94g / cm 3 , the porosity is 90%, and the specific surface area is 1153m 2 / m 3 , the filler volume is 0.25L, and the solution volume is 650mL. The simulated biogas (hydrogen sulfide content is about 0.5%) is made by mixing two kinds of cylinder gases according to a certain ratio: (1) ordinary nitrogen (N 2 ≥99.5%); (2)H 2 S standard gas (H 2 About 10% S, the rest is N 2 ). O required for biological desulfurization 2 Supplied by an air pump, the air and simulated biogas are evenly mixed and then enter the reactor. The gas flow rate of the inlet pipe of the reactor is the same as the gas flow rate of the outlet pipe. See Table 1 for the composition of the nutrient solution, add NaHCO 3 As the inorganic carbon source for desulfurization bacteria, 1mol / L hydrochloric acid and sodium hydroxide solution were used to adj...

Embodiment 3

[0073] adopt respectively figure 1 The shown biological bubble column and figure 2 The biotrickling filter system shown ( figure 2 Middle—indicates the waterway, ---indicates the airway), the filler is a modified biological suspension filler, the material is polyurethane, and the density is 0.93g / cm 3 , the porosity is 87%, the specific surface area is 1450m 2 / m 3 , the filler volume is 0.25L. The volume of nutrient solution in the biological bubble tower is 650mL. The nutrient solution of the biological trickling filter is trickling filtrate, with a volume of 650mL, which is placed in the circulating liquid tank separately and supplied to the bed of the trickling filter through a liquid circulating pump. Simulated biogas (with a volume fraction of about 0.5% H 2 S) It is made by mixing two kinds of cylinder gases according to a certain ratio: (1) ordinary nitrogen (N 2 ≥99.5%); (2)H 2 S standard gas (H 2 S is about 10%, and the remaining gas is N 2 ). O required...

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Abstract

The invention discloses a gas circulation type biological bubble tower biogas / natural gas biological desulfurization method, which belongs to the technical field of environmental protection pollution treatment. The biogas / natural gas biological desulfurization method of the gas circulation type biological bubble tower is adopted, including: mixing the biogas / natural gas containing hydrogen sulfide with air or oxygen, and the mixed gas enters the reactor from the bottom of the biological bubble tower reactor through the bubble diffuser Intermediate purification, the purified biogas / natural gas is divided into two parts, one part is circulated and refluxed by the gas circulation pump, and enters the reactor together with the mixed gas, and the other part is directly discharged from the top of the reactor. The method of the present invention will H 2 S is basically converted into elemental S, which significantly reduces the cost of post-treatment and the risk of secondary pollution; especially the biogas after recycling and purification greatly increases the desulfurization efficiency and the yield of elemental sulfur.

Description

technical field [0001] The invention belongs to the technical field of environmental protection pollution treatment, and in particular relates to a biogas / natural gas biological desulfurization method for improving the efficiency of biological desulfurization and the yield of simple sulfur through gas circulation. Background technique [0002] Biogas, natural gas and other energy gases, as important clean energy sources, are an important part and key link of energy conservation and emission reduction, and have played a huge role in coping with climate change, developing a low-carbon economy, and promoting the construction of new countryside. However, in the process of biogas production and natural gas extraction, it is often accompanied by H 2 S gas production. h 2 S is a harmful and highly toxic gas, when the concentration in the air exceeds 28mg / m 3 People cannot work normally; more than 1000mg / m 3 , it can cause acute poisoning and cause death. In addition, H 2 S al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/52B01D53/84C10L3/10
CPCY02A50/20
Inventor 江霞吴见平靳紫恒蒋文举
Owner SICHUAN UNIV
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