Biological desulfurization device and process

Abstract

The invention discloses a biological desulfurization device and a desulfurization process thereof. The process comprises the steps: pumping a desulfurization solution into the top of a desulfurization tower by using a circulating pump, and spraying the desulfurization solution to the surface of filler through a sprayer, so as to keep the surface of the filler wet; at an air inlet of the desulfurization tower, proportionally injecting air into raw material biogas containing hydrogen sulfide by a variable-frequency air blower, so as to form mixed gas; enabling the mixed gas to pass through a filler layer, when the hydrogen sulfide in the mixed gas is absorbed by a biomembrane on the surface of the filler; and discharging purified gas from an outlet of the desulfurization tower, thus completing desulfurization. The process is a biological desulfurization process which is low in operating cost, strong in desulfurization capacity and stable and safe in operation; the air injection proportion is controlled and regulated by a PLC (Programmable Logic Controller) and the variable-frequency air blower and can be regulated according to the concentration of hydrogen sulfide at an inlet of the system and the concentration of oxygen gas at an outlet of the system, so that the demand on oxygen gas during desulfurization can be guaranteed, and the problem that the air blower injects too much air into the raw material gas can also be avoided.

Description

technical field [0001] The invention relates to biogas and biomass gas desulfurization, in particular to a biological desulfurization device and a desulfurization process. Background technique [0002] The biogas produced in the sewage anaerobic process can be used for power generation or purification to produce natural gas, but the hydrogen sulfide in it will seriously corrode the pipeline and equipment, so the hydrogen sulfide must be removed before the gas can be used. [0003] Biological method is an emerging desulfurization process. Compared with traditional dry and wet desulfurization processes, its significant advantage is that the operating cost is very low, but biological desulfurization has harsh control conditions, unstable desulfurization efficiency, and biological sludge is not easy to clean up. And other problems limit the popularization and application of this technology. [0004] Patent CN101597529B discloses a "biogas desulfurization device". Its process fl...

AI Technical Summary

Problems solved by technology

But its air injection ratio is fixed and cannot be adjusted

Moreover, the nutrient composition of biogas slurry is single, which is not suitable for providing nutrients for desulfurization bacteria for a long time.

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