A system for the production of straw biogas coupled with power generation waste heat utilization

Abstract

The invention relates to a coupled system for preparing straw biogas and utilizing power generation waste heat, which comprises a pulverizer, a regulating tank, a medium-temperature fermentation tank, a first extrusion solid-liquid separation machine, a hydrothermal reactor, a high-temperature fermentation tank, a second extrusion solid-liquid separation machine, a drying machine, a biogas purification device, a biogas power generation set, a first water-water heat exchanger, a second water-water heat exchanger, a first hot-water cylinder, a sludge-water heat exchanger and a second hot-water cylinder. Compared with the prior art, the medium-temperature fermentation tank, hydrothermal reactor and high-temperature fermentation tank are connected in the system to implement the medium-temperature fermentation / hydrothermal treatment / high-temperature fermentation combined biogas preparation technique, thereby enhancing the biogas yield of the raw materials and shortening the fermentation period. The medium-temperature fermentation / hydrothermal treatment / high-temperature fermentation biogas preparation technique is combined with comprehensive utilization of biogas power generation waste heat, thereby enhancing the straw biogas preparation efficiency and lowering the comprehensive energy consumption of the system.

Description

technical field [0001] The invention relates to the field of renewable energy development, in particular to a system for preparing straw biogas coupled with power generation and waste heat utilization. Background technique [0002] China is a large agricultural country, producing about 800 million tons of crop straw every year. At present, the energy utilization methods of straw mainly include incineration, gasification, pyrolysis, ethanol fermentation and biogas fermentation. Compared with other conversion technologies, using biogas fermentation technology to process and utilize straw can not only produce efficient, clean and high-grade energy, but also produce biogas residue and biogas slurry can be directly used as organic fertilizer, which is an effective way out . Biogas fermentation technology itself is a very mature technology. Using this technology to convert straw into new energy can alleviate the shortage of conventional energy in my country and improve the quali...

AI Technical Summary

Problems solved by technology

In addition, the presence of soluble sugars and easily biodegradable hemicellulose in raw materials will reduce the direct contact area between steam and refractory cellulose and lignin structures, thereby reducing the treatment efficiency of hydrothermal treatment.

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