Device and method for efficient biogas production and purification by combining solid-liquid separation with pressure swing adsorption

Abstract

The invention discloses a device and method for efficient biogas production and purification by combining solid-liquid separation with pressure swing adsorption. The device comprises a solid-liquid separation assembly, a gas production assembly, a gas collection assembly, a desulfurization drying tower, a filtering tower, a first-stage adsorption tank, a second-stage adsorption tank and an auxiliary vacuum tank, wherein the solid-liquid separation assembly comprises an assembly rack, a centrifugal separation tank, a liquid collection tank mechanism, a slag discharge mechanism and a feed distribution mechanism, the centrifugal separation tank is of a truncated cone-shaped shell structure with an opening in the bottom end, and a plurality of centrifugal separation holes communicated with the interior of the centrifugal separation tank are formed in the side surface of the centrifugal separation tank. The method comprises the steps of S1, firstly conducting solid-liquid separation; and S2, carrying out fermentation gas production on the solid and liquid separated in the step S1 by utilizing the gas production assembly. According to the process, the three technologies of solid-liquid separation of livestock and poultry manure, biogas slurry fermentation gas production and biogas purification are integrated, efficient biogas production is achieved, the solid-liquid separation technology is optimized again, efficient separation of a solid-phase material and a liquid-phase material is achieved, and the biogas production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of biogas production and purification, in particular to a device and method for high-efficiency biogas production and purification in combination with solid-liquid separation and pressure swing adsorption. Background technique [0002] Biogas is a combustible mixed gas produced by microorganisms. Its main component is methane, with a content of about 50-75%, followed by 25-45% carbon dioxide, and other gases, such as hydrogen sulfide, carbon monoxide, nitrogen, water vapor, oxygen, etc. Biogas purification is mainly to remove hydrogen sulfide, carbon dioxide, sulfur dioxide, halogenated mixed gases and siloxane in biogas. [0003] The solid-liquid separation technology refers to the separation of the solid phase and the liquid phase of livestock and poultry manure, which reduces the solid content in the liquid phase and the moisture content of the solid phase, and reduces the load and treatment costs of sub...

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Problems solved by technology

[0005] At present, most farms use mixed fermentation to prepare biogas, but the effect of this method is not good; the existing process of using solid-liquid separation device to prepare biogas also has the disadvantage of low separation efficiency

The fermented biogas contains a lot of impurities, so the utilization rate is relatively low; the process structure of purifying biogas using the principle of pressure swing adsorption is relatively complicated, which makes the corresponding equipment bulky and energy-consuming

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