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Gas circulation biological bubble tower methane/natural gas biological desulfuration method

A technology of gas circulation and biological desulfurization, which is applied in the field of biogas/natural gas biological desulfurization, can solve the problems of poor hydrogen sulfide solubility, failure to meet the use standard, and reduced desulfurization efficiency, so as to increase desulfurization efficiency, increase yield, and improve desulfurization efficiency Effect

Active Publication Date: 2019-06-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 methane/natural gas biological desulfuration method
  • Gas circulation biological bubble tower methane/natural gas biological desulfuration method
  • Gas circulation biological bubble tower methane/natural gas biological desulfuration method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0049] use figure 1 Shown biological bubble tower system ( figure 1 Middle --- means gas path), the filler is 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 gas cylinder gases in a certain proportion: (1) Ordinary nitrogen (N 2 ≥99.5%); (2)H 2 S standard gas (H 2 S is about 10%, the rest is N 2 ). O required for biological desulfurization 2 It is supplied by an air pump, and the air and the simulated biogas are evenly mixed and 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, with NaHCO added 3 As an inorganic carbon source for desulfurization bacteria (in actual production, the bioga...

Embodiment 2

[0062] use figure 1 The shown biological bubble column system, the filler is modified biological suspended filler, the material is polyethylene, and the density is 0.94g / cm 3 , Porosity is 90%, 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 gas cylinder gases in a certain proportion: (1) Ordinary nitrogen (N 2 ≥99.5%); (2)H 2 S standard gas (H 2 S is about 10%, the rest is N 2 ). O required for biological desulfurization 2 It is supplied by an air pump, and the air and the simulated biogas are evenly mixed and 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. Nutrient solution components are shown in Table 1, add NaHCO 3 As an inorganic carbon source for desulfurization bacteria, 1 mol / L hydrochloric acid and sodium hydroxide solution were used to adjust the pH value of ...

Embodiment 3

[0073] Respectively adopt figure 1 Shown biological bubble tower and figure 2 The shown biological trickling filter system ( figure 2 Middle——indicating waterway, ---indicating airway), the filler is modified biological suspension filler, the material is polyurethane, 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 650 mL. The nutrient solution of the biological trickling filter is trickling filtrate with a volume of 650 mL, which is separately placed in the circulating liquid tank 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) Two cylinder gases are mixed according to a certain ratio: (1) Ordinary nitrogen (N 2 ≥99.5%); (2)H 2 S standard gas (H 2 S is about 10%, remaining gas is N 2 ). O required for biological desulfurization 2 Supplied by a...

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Abstract

The invention discloses a gas circulation biological bubble tower methane / natural gas biological desulfuration method and belongs to the technical field of environment-friendly pollution treatment. The gas circulation biological bubble tower methane / natural gas biological desulfuration method comprises the steps of mixing methane / natural gas containing hydrogen sulfide with air or oxygen, allowingmixed gas to enter into a reactor for purification through a bubble diffuser from the bottom of a biological bubble tower reactor, dividing the purified methane / natural gas into two parts, allowing one part to circularly back flow through a gas circulation pump and enter the reactor with the mixed gas, and directly discharging the other part from the top of the reactor. The method basically converts H2S into elemental S, and significantly reduces post-treatment cost and secondary pollution risks; in particular, the methane is purified circularly; the desulfurization efficiency is greatly improved; and a yield of elemental sulfur is increased.

Description

Technical field [0001] The invention belongs to the technical field of environmental pollution treatment, and specifically relates to a biogas / natural gas biological desulfurization method that improves the efficiency of biological desulfurization and the yield of sulfur element through gas circulation. Background technique [0002] Energy gas such as biogas and natural gas, as an important clean energy source, is an important part and key link of energy saving and emission reduction, and has played a huge role in responding to climate change, developing a low-carbon economy, and promoting the construction of new rural areas. However, in the process of biogas production and natural gas extraction, 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 can’t work normally; more than 1000mg / m 3 At times, it can cause acute poisoning and cause death. In addition, H 2 S has a strong corrosive effect on pipes, burners ...

Claims

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Application Information

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Patent Type & Authority Applications(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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