Cold, heat and electricity triple supply system combining geothermal energy and biogas

Abstract

The invention discloses a cold, heat and electricity triple supply system combining geothermal energy and biogas. The cold, heat and electricity triple supply system comprises a biogas-Stirling powergeneration system, a geothermal system and a heat pump system, wherein the electric quantity generated by the biogas-Stirling power generation system is directly used for the heat pump system, the redundant electric quantity is connected into a power grid, ground source side circulating water is used for recycling heat of the cold end of a Stirling generator, waste heat of the ground source side circulating water in the heating period is used as a low-temperature heat source for the heat pump system, the waste heat of the ground source side circulating water in the refrigerating period is stored in a stratum, the heat pump system is used for heating/refrigerating equipment of a user, and heating/refrigerating return water is used for controlling the temperature of a biogas generation pool.The cold, heat and electricity triple supply system has the beneficial effects that the geothermal energy and the biogas energy are used as main energy sources, the stratum is used as a large heat storage system capable of providing part of energy, and the cold, heat and electricity triple supply system is clean, efficient, sustainable and capable of well carrying out regional energy balance adjustment.

Description

technical field [0001] The invention relates to a triple supply system of cold, heat and electricity, in particular to a triple supply system of cold, heat and electricity combined with geothermal energy and biogas, and belongs to the technical field of energy utilization. Background technique [0002] With the improvement of living standards, the demand of urban residents in my country for heating in winter and cooling in summer is also increasing. Statistics show that as of 2017, my country's heating area has reached 7.387 billion m 2 , The energy consumption required for heating and cooling accounts for about 15% of my country's total primary energy consumption. [0003] At present, the heating in winter is mainly based on centralized coal or gas heating, and the cooling in summer is mainly based on air-source air conditioners or heat pumps. [0004] In the field of heating, the centralized heating of cities and towns in my country is mainly based on combined heat and p...

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Problems solved by technology

Due to the characteristics of high exhaust gas temperature and unstable biogas resources, the biogas power generation system has problems such as low energy conversion efficiency, small and unstable power supply, so it is difficult to promote on a large scale

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