Organic Rankine cycle generating device using residual heat generated during CAES process

Abstract

The invention discloses an organic Rankine cycle generating device using residual heat generated during the CAES process. The organic Rankine cycle generating device can effectively use exhaust cold energy of an adiabatic compressed air expander and residual compression heat energy of a compressor. The organic Rankine cycle generating device comprises an exhaust cold energy recoverer, an organic working medium pump, an organic working medium condenser, an organic working medium expander, a residual compression heat energy recoverer, a water pump, a connecting pipeline and other components. The operating time of the organic Rankine cycle generating device is the energy release and expansion phase of the CAES. The exhaust cold energy recoverer is used for recovering the exhaust cold energy of the compressed air expander. The residual compression heat energy recoverer is used for recovering the residual compression heat in a water tank. The organic Rankine cycle generating device is used for converting the recovered heat energy and the recovered cold energy into electric energy. The round trip efficiency of the CAES is improved, and besides, the circulation of cold water for cooling the cold water tank is eliminated.

Description

technical field [0001] The invention belongs to the technical field of energy storage and energy saving, and in particular relates to an organic Rankine cycle power generation device utilizing the waste heat of a CAES process. , can realize the efficient storage and utilization of electric energy. On the basis of traditional adiabatic compressed air energy storage, this technology improves the energy storage round-trip efficiency of the system through the recovery of heat and cold energy, eliminates the cold water cycle for cooling the cold water tank, and reduces the discharge of waste hot water. Background technique [0002] Compressed air energy storage system (CAES) can realize large-capacity and long-term electric energy storage, and adiabatic compressed air energy storage is an advanced energy storage system that does not depend on fuel. During operation, a large amount of heat of compression will be generated. Due to the limitation of the heat transfer temperature di...

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Problems solved by technology

[0003] For the existing adiabatic compressed air energy storage system (CAES), the air temperature at the outlet of the expander is lower than the atmospheric temperature during the energy release process, resulting in the waste of part of the cold energy, and a large amount of compression heat generated during the energy storage process, due to the heat transfer temperature difference of the heat exchanger The restriction cannot be fully transmitted to the compressed air in the energy release process, which will cause the temperature of the heat storage medium in the heat storage system to rise and adversely affect the operating efficiency of the system. The purpose of this invention is to use the organic Rankine cycle in the adiabatic compressed air storage The energy release and expansion stage of the energy storage system (CAES) recycles the remaining compression heat and exhaust cold energy in the energy storage system, and improves the energy storage round-trip efficiency of the system through the recovery of heat and cold energy and eliminates the need to cool down the cold water tank Cooling water circulation, reducing the discharge of waste hot water, so as to realize the efficient storage and utilization of electric energy

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