Biomass treatment system capable of purifying biogas and carbon dioxide

Abstract

The invention provides a biomass treatment system capable of purifying biogas and carbon dioxide, which relates to the technical field of biogas separation and purification and comprises a biomass raw material pretreatment system, a biomass fermentation system, a biogas post-treatment system, a biogas purification system and a carbon dioxide purification system which are connected in sequence, the biogas purification system comprises a first compressor and a membrane separation device which are connected in sequence; the carbon dioxide purification system comprises a low-temperature liquefaction rectifying tower; the membrane separation device is used for biogas purification, moisture increase caused by absorption method purification is eliminated, and it can be guaranteed that the purity of the purified methane reaches 97% required by biogas. All the devices are organically, reasonably and efficiently combined together to form a complete biomass treatment system, biomass waste is converted into recyclable biological natural gas and food-grade carbon dioxide, the diversity of products is enriched, waste of resources is avoided, and carbon emission is reduced.

Description

technical field [0001] The invention belongs to the technical field of biogas separation and purification, in particular to a biomass treatment system capable of purifying biogas and carbon dioxide. Background technique [0002] Raw materials such as livestock and poultry manure, kitchen, and kitchen waste will produce biogas after anaerobic fermentation process. Biogas is composed of a large amount of methane (about 50-80%), carbon dioxide (about 20-40%) and a small amount of hydrogen sulfide and nitrogen. , oxygen, water vapor and other impurity gases. [0003] At present, the utilization of biogas in China is focused on biogas combustion for power generation and purification of bio-natural gas, both of which are aimed at the utilization of methane in biogas, while carbon dioxide, another important resource in biogas, is generally ignored. Carbon dioxide accounts for nearly half of biogas, second only to methane content. After the methane is purified, the proportion of c...

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Problems solved by technology

[0004] The current biogas purification project and carbon capture project have not yet been realized at the same time. The by-products after biogas purification are not fully utilized, which not only causes waste of energy, but also emits a large amount of carbon and pollutes the atmospheric environment.

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