Phase-change energy storage solar biogas digester that can realize two-stage day and night self-circulation of hot water system

Abstract

The invention discloses a phase-change stored energy solar-energy methane tank capable of realizing twin-stage self-circulation day and night of hot water system, and belongs to the technical field of use of solar energy and biomass energy. The solar-energy methane tank comprises a methane fermenting tank, a solar energy hot water circulating system and a phase-change storage energy system; the solar energy hot water circulating system comprises a first-grade lifting pipe, a water returning pipe, a hot storage water tank arranged at the inner part of the methane fermenting system, a declining radiating pipe group and a water returning water collecting tank, and a solar energy heat collector arranged at the outer part of the methane fermenting tank; the phase-change storage energy system comprises a second-grade lifting pipe arranged in the methane fermenting pond and multiple phase-change energy storage units arranged in the a water returning water collecting tank; one end of the second-grade lifting pipe is connected with the water returning water collecting tank, and the other end is connected with the hot storage water tank; the phase-change energy storage unit comprises a packaging shell body and a phase-change heat storage material located in the packaging shell body; the heat emitted by the phase-change heat storage material in the phase-change process can provide heat required by fermentation for materials in the methane fermenting pond.

Description

technical field [0001] The invention relates to the technical field of solar energy and biomass energy utilization, in particular to a phase-change energy storage solar biogas digester capable of realizing two-stage day and night self-circulation of a hot water system. Background technique [0002] Using solar energy to increase the temperature of biogas fermentation in the biogas digester is a common technical means for increasing the temperature of the biogas digester, so that the biogas can be kept at the medium temperature and high temperature fermentation stage, and the fermentation gas production rate can be increased. But at present, the design of solar biogas digesters almost all utilizes circulating water pumps to provide the power of hot water circulation in pipelines, such as solar constant temperature biogas digesters (Chinese patent application number 201210055393.7), solar biogas digesters (application number 201110063984.4 Chinese patent) etc.; the water pump ...

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Problems solved by technology

But at present, the design of solar biogas digesters almost all utilizes circulating water pumps to provide the power of hot water circulation in pipelines, such as solar constant temperature biogas digesters (Chinese patent application number 201210055393.7), solar biogas digesters (application number 201110063984.4 Chinese patent), etc.; the water pump consumes electric energy during long-term operation, increases operating costs, and also causes problems in control and maintenance, which is contrary to the design concept of reducing electric energy consumption of solar biogas digesters

[0003] In the patent "An above-ground solar biogas digester that can realize the natural circulation of the hot water system" (ZL201410161484.8), a solar biogas digester that can realize the natural circulation of the hot water system during the day is designed by using the siphon effect. When there is no sunlight at night, the solar hot water circulation system cannot work, causing the temperature of the biogas tank to drop. The low temperature will stop the fermentation in the biogas tank and cannot produce biogas. Therefore, the solar biogas tank cannot function at night, which affects the continuity of biogas production. will adversely affect

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