Waste heat comprehensive utilization system of biogas project

Abstract

The invention relates to a novel comprehensive waste heat utilization system of biogas engineering. The biogas engineering comprises a fermentation tank and a biogas residue and liquid tank, and a step waste heat recycling system comprises a hot water tank, a primary heat lifting system and a secondary heat lifting system. According to the novel comprehensive waste heat utilization system of biogas engineering, the heat in the biogas resides and biogas liquids is collected into the hot water tank through the primary heat lifting system, heat in the hot water tank is further heated by using a small amount of electric energy through the second heat lifting system and is subsequently fed into a thermal storage tank, the heat in the thermal storage tank is further heated through a straight combustion type heat pump and is conducted to the fermentation tank, then the temperature necessary for biogas fermentation is maintained, the heat carried in the discharged biogas residue and the biogas liquid is effectively utilized, the energy consumption for maintaining the fermentation temperature is reduced, the normal operation of the biogas engineering is effectively maintained, the positive cycle of the system is maintained, the operation cost of the biogas engineering is reduced, the energy consumption is reduced by 50-90%, the situation that the biogas engineering can make no profit is changed, and great economic benefits are generated.

Description

technical field [0001] The invention relates to an energy recovery and utilization system, in particular to a comprehensive utilization system of waste heat in a biogas project. Background technique [0002] At present, fossil fuels such as oil, natural gas, and coal are increasingly scarce all over the world. Due to the non-renewability of fossil fuels, countries are actively looking for and researching alternative energy sources. Compared with fossil energy, biomass energy has very obvious advantages, and it is a form of renewable energy that integrates environmental protection and economic benefits. At the same time, the rapid development of China's economy has also brought serious environmental problems. Improving the ecological environment and realizing sustainable economic development are the policy priorities for China's future development. Water pollution and land pollution caused by biomass waste discharge have seriously restricted the sustainable development of my...

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Problems solved by technology

[0005] The present invention aims at the problems of high energy consumption and high cost in the operation of the current biogas project, the large amount of low-grade heat generated cannot be utilized, the produced biogas is difficult to ensure the operation of the system, and the benefit is poor. A comprehensive utilization of waste heat in biogas projects is designed. system

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