Methane bio-desulfurization device

Abstract

The invention discloses a methane bio-desulfurization device, which comprises a desulfurizing tower, wherein the inside of the desulphurizing tower is provided with a packing layer; the lower part of the packing layer is provided with a methane inlet, a drain outlet and a liquid outlet; and the upper side of the packing layer is provided with an air outlet and a liquid inlet. The device is characterized by also comprising a regenerating tank and a pump, wherein the pump can pump an absorbing liquid discharged from a liquid outlet of the desulfurizing tower into the regenerating tank; the bottom part of the regenerating tank is provided with an air inlet and an air inlet pipe to supply air to the absorbing liquid in the regenerating tank for aeration and controlling the dissolved oxygen content of the absorbing liquid; a liquid outlet of the regenerating tank is also communicated with a settling tank so as to make an elemental sulfur in the absorbing liquid settled and separated; the upper part of the settling tank is provided with a clear liquid outlet communicated with a barren liquid tank; a liquid outlet of the barren liquid tank is communicated with a liquid inlet of the desulfurizing tower through an absorbing liquid pump and a circulating pipeline; and the lower part of the settling tank is provided with a deposition discharging outlet. The desulfurization device has theadvantages of long operation period, safety and good desulfurization effect.

Description

technical field [0001] The invention belongs to the field of energy-biogas, in particular to a biogas desulfurization device. Background technique [0002] There is usually hydrogen sulfide gas in the biogas produced by anaerobic digestion. Hydrogen sulfide gas is highly corrosive to metal pipes, gas storage cabinets and gas equipment under humid and hot conditions. When biogas is burned, hydrogen sulfide will be converted into sulfur dioxide Or sulfur trioxide, not only pollute the environment, but also corrode equipment. Therefore, the hydrogen sulfide gas must be removed from the biogas before use. [0003] The existing desulfurization methods include dry desulfurization. The method is to remove the hydrogen sulfide in the biogas through the chemical reaction between the desulfurizer iron oxide and hydrogen sulfide in the dry desulfurization tower. However, the iron oxide will become invalid after repeated use, and a large amount of oxidation Iron scrap will cause secon...

AI Technical Summary

Problems solved by technology

The structure of this desulfurization device is simple, but there are the following problems: 1. The air and biogas of this device enter the desulfurization tower from the same entrance, and the biogas and air are first in direct contact. Since biogas is a flammable gas, there is a great potential safety hazard , it is easy to burn and explode; 2. In the process of desulfurization, oxygen-biogas flows through the packing layer in parallel, and its dissolution in the absorption liquid has a process, so although the oxygen supply and the oxygen content in the gas in the tower are obviously easy control, but the amount of dissolved oxygen is not easy to control. If the amount of dissolved oxygen is too much, highly corrosive sulfuric acid will be produced, which will damage the equipment. If the amount of dissolved oxygen is too small, the desulfurization effect will be seriously affected; 3. During the process, the elemental sulfur produced in the desulfurization tower is easy to block the packing layer, which has a great impact on the use effect and service life

The volume of the nutrient solution section is limited, and affected by the absorption liquid sprayed down from the upper part, the elemental sulfur in the nutrient solution section is not easy to settle and separate, which affects the desulfurization effect

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