Water pumping and compressed air energy storage system and method for storing energy and heat by utilizing geothermal well

Abstract

The invention discloses a water pumping compressed air energy storage system and method for storing energy and heat through a geothermal well. The water pumping compressed air energy storage system comprises a compressor unit, a heat exchanger, a combustion chamber unit and an expansion unit. An outlet of each stage of compressor is connected with a heat exchanger, the heat exchanger is connected with a cold water storage pool and a hot water storage pool, the heat exchanger is further connected with a combustion chamber unit and a first geothermal well, and a combustion chamber is arranged in the combustion chamber unit. An outlet of the first geothermal well is sequentially connected with a third heat exchanger, a variable frequency water pump, a fourth heat exchanger and a second geothermal well, the fourth heat exchanger is further connected with an under-pressure water turbine, and the under-pressure water turbine is connected with the third heat exchanger. The compressor air energy storage system, the underground geothermal well, the variable frequency water pump and the pressurized water turbine are mutually coupled, low-grade compression heat and exhaust waste heat of the expansion machine during energy storage are utilized, the energy utilization efficiency is improved, and meanwhile the effect of improving the geothermal recovery function is achieved.

Description

technical field [0001] The invention belongs to the technical field of physical energy storage, and in particular relates to a pumped compressed air energy storage system and method utilizing geothermal wells for energy storage and heat storage. Background technique [0002] Geothermal energy is a kind of renewable and clean energy. With the increasing awareness of environmental protection and the shortage of energy, the rational development and utilization of geothermal resources has become more and more popular. Among them, the geothermal energy stored within 2,000 meters from the surface is 250 billion tons of standard coal. The use of geothermal wells for heating has become a new trend in many northern regions. However, with the expansion of the utilization scale of geothermal wells and the increase in application time, the underground heat of geothermal wells is difficult to recover due to the limited non-heating period of geothermal wells and the limited underground he...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of heat attenuation of geothermal wells, the present invention proposes to use the high pressure-bearing capacity of geothermal wells as a high-pressure gas storage physical space for compressed air for non-heating seasons, and then connect adjacent geothermal wells together through high-pressure water pumps to construct a A new type of pumped compressed air composite energy storage system, through the coupling of pumped compressed air energy storage and geothermal wells, not only solves the physical storage space of compressed air energy storage in cities and towns, but also solves the problem of geothermal well heating, using geothermal energy The well is coupled with the frequency conversion water pump and the pressurized water turbine, which can realize the stable operation of the compressor during the energy storage process and the expander during the energy release process

Images