Layered biological-chemical combined biogas desulfurizing device

Abstract

The invention discloses a layered biological-chemical combined biogas desulfurizing device. The layered biological-chemical combined biogas desulfurizing device comprises a chemical absorbing layer, a biological desulfurizing layer and an alkali liquor circulating system; the chemical absorbing layer is provided with a biogas outlet pipe, a sprinkler head, a filler layer, a biogas inlet pipe, a biogas inlet pump and a biogas distributing plate, wherein an isolation plate, a settling tank, a biological aeration tank, an air aeration plate, an air inlet pump, an air inlet pipe, a mud discharging and sulfur pipe, an air outlet, a settling tank overflow opening and a dissolved oxygen probe are arranged on the biological desulfurizing layer, wherein the upper part of the isolation plate is inverted-conical; and the lower part of the isolation plate is conical; and an overflow pipe, a pH value probe, an alkali liquor circulating pipe, an alkali liquor circulating pump, a material supplementing pipe, a material supplementing pump, a liquid storage groove and a liquid storage groove overflow opening are arranged in the alkali liquor circulating system. According to the invention, chemical absorption and biological desulfurizing processes are organically combined, so that efficient desulfurizing can be achieved and the desulfurizing cost can be controlled; meanwhile, as the filler layer, the biological aeration tank and the settling tank are skillfully integrated, compact design, land conservation and convenient promotion are achieved.

Description

technical field [0001] The invention relates to a layered biological-chemical combined biogas desulfurization device. Background technique [0002] Biogas is a flammable mixed gas containing CH 4 60%-70%, CO 2 25%-40% and a small amount of H 2 S, NH 3 、H 2 and CO et al. H in biogas 2 S content is generally 1-11g / m 3 . h 2 S is a highly toxic and harmful gas, which has a strong corrosive effect on pipes, burners, and other metal equipment, instruments, etc. in the air or under humid conditions. h 2 Combustion of S to generate SO 2 , can directly affect human health; SO 2 When it meets water, it will generate sulfuric acid, which has a strong corrosive effect. Therefore, before the biogas is used, the H in the biogas must be removed 2 S. my country's environmental protection standards stipulate that when used as energy, H in biogas 2 S content shall not exceed 20mg / m 3 . Due to the H in the biogas 2 S concentration is generally much higher than the provisi...

AI Technical Summary

Problems solved by technology

Although the dry iron oxide desulfurization technology is relatively mature, it still has the following disadvantages: high operating costs, cumbersome operation, high labor intensity, low sulfur capacity, and secondary pollution caused by waste desulfurizers, etc.

The single biological desulfurization process usually has a large desulfurization tower, occupies a large area, has low hydrogen sulfide removal rate, and unstable process operation.

In addition, in the case of excessive oxygen in the desulfurization tower, the sulfide will be directly oxidized to sulfate, which will affect the regeneration of alkali liquor in the desulfurization tower, thereby affecting the absorption efficiency of hydrogen sulfide, and finally leading to low desulfurization efficiency

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