System for using waste heat of fermentation broth and biogas slurry obtained by anaerobic fermentation biogas production and use method therefor

Abstract

The invention discloses a system for using waste heat of fermentation broth and biogas slurry obtained by anaerobic fermentation biogas production and a use method therefor. Fermentation broth eduction pipes at a lower part of an anaerobic fermentation tank are connected respectively to fermentation broth reaction tanks in a first greenhouse and to fermentation broth radiators in a second greenhouse. Fermentation broth reaction tank branch pipes at the back of the first greenhouse are converged to a fermentation broth circulating pipe and are connected to an upper part of the anaerobic fermentation tank by a fermentation broth circulating pump so that a circulating loop is formed. Fermentation broth radiator branch pipes at the back of the second greenhouse are converged to a biogas slurry recovery pipe and are connected to a biogas slurry recovery tank by a biogas slurry recovery pump. The system realizes the combination of construction and management of an anaerobic fermentation reaction system, and heating requirements of greenhouses, realizes utilization of fermentation broth waste heat in use, reduces an investment of radiating pipes in greenhouses, is convenient for low-cost anaerobic-fermentation tank expansion, greatly improves a return rate of an overall investment, and is stable.

Description

technical field [0001] The technical field of the anaerobic fermentation biogas of the present invention, in particular relates to a fermentation liquid and biogas slurry waste heat utilization system and usage method of anaerobic fermentation biogas. Background technique [0002] By the end of 2010, my country had more than 14,000 large and medium-sized biogas projects supported by the state, mainly classified into energy recovery type, environmental protection type and comprehensive use type. Among these projects, large-scale projects (anaerobic fermentation tank 1000m 3 The return on investment of the above) is generally 10%-20%, and most small and medium-sized (anaerobic fermentation tanks 1000m 3 Below) the return on investment is below 10%. Although the rate of return will increase with the expansion of production scale, due to the technical reasons of the anaerobic fermentation tank itself, the size of a single fermentation tank is generally not easy to exceed 2000m...

AI Technical Summary

Problems solved by technology

Such a high cost of heat preservation has caused many greenhouse operators to give up active heat preservation measures mainly based on heating, but only adopt passive heat preservation measures with thicker heat preservation layers, so that the heat preservation effect cannot be guaranteed, and it is impossible to plant plants that require high temperature and are economical. Crops with better benefits, even in extreme weather in winter, will suffer serious economic damage due to freezing damage

In addition, crops cannot carry out photosynthesis in the way of thickening the insulation layer and passive insulation, and once the insulation layer is uncovered and the internal heat is lost, it cannot be replenished. The method of thickening the insulation layer and passive insulation itself does not generate heat, so many In winter, growers generally only hope that the crops will not be frozen to death, and that they can be sold at a good price after the spring, but they cannot expect stable output throughout the year without being affected by seasonal temperatures; some even give up winter planting altogether. Lost opportunity to increase income

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