Biogas anaerobic fermentation tank waste heat utilization and temperature increasing system

Abstract

A biogas anaerobic fermentation tank waste heat utilization and temperature increasing system is composed of three parts of an anaerobic fermentation tank, a heat pump/a heat pump unit, and a biogas residue and biogas slurry tank. Biogas residues and biogas slurry serve as low-grade heat sources to transmit heat to a heat conducting medium through a concrete pre-embedded coil pipe integrated radiation tail end, and the heat conducting medium is compressed into high-temperature and high-pressure gas through the heat pump unit and then releases the heat to the fermentation tank through the concrete pre-embedded coil pipe integrated radiation tail end, so that the temperature required by biological anaerobic fermentation is guaranteed; and when the temperature of the fermentation tank is high and the fermentation temperature requirement can be met directly by fluoroplastic pump circulation, the heat pump unit is shut down. The characteristic of high viscosity of fermentation liquid is fully considered, and the concrete pre-embedded coil pipe integrated radiation tail end replaces a traditional heating coil pipe, so that the problem that the traditional heating coil pipe is likely to scale, and consequently, the heat exchange efficiency is sharply reduced is effectively avoided, and the structure is simple; and meanwhile, the waste heat of the biogas residues and the biogas slurry are used for increasing the temperature of the anaerobic fermentation tank through a direct-expansion type heat pump system, so that high efficiency and energy saving are achieved.

Description

Technical field [0001] The invention relates to a waste heat utilization and warming system of a biogas anaerobic fermentation tank, in particular to a direct expansion heat pump system based on the integrated radiation end of a concrete embedded coil tube, which utilizes the waste heat of the biogas residue and liquid as a biogas anaerobic fermentation tank Warm up. Background technique [0002] With the large-scale use of coal, petroleum and other fossil energy sources around the world, including resource limitations and environmental issues, many countries attach importance to biomass energy as an important energy source; biogas is a commonly used biomass energy source in rural my country Its development and utilization is an effective measure to solve the problem of rural energy supply under the energy shortage situation, and its development is increasingly being valued by the country. [0003] The production of biogas is closely related to temperature. There are three modes of...

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Problems solved by technology

[0009] The above-mentioned publications have proposed heating systems and devices for increasing the temperature of biogas anaerobic fermentation tanks from different angles, but they have never considered the problem of easy fouling when using heating coils to increase the temperature of fermentation tanks. In fact, due to the high viscosity of fermentation liquid , whether the heating coil is installed at the bottom of the fermentation tank or wound on the wall of the tank, scaling will form on its surface after a period of use, causing the heat transfer efficiency to decline sharply. In addition, biogas projects discharge a large amount of biogas residue and biogas slurry every day , the temperature of the discharged biogas residue and biogas slurry is about 35°C, which is very close to the temperature required for anaerobic fermentation of biogas, and the potential for waste heat utilization is huge

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