CO2 combined cooling and power system with multifunctional refrigeration mode

Abstract

The invention discloses a CO2 combined cooling and power system with a multifunctional refrigeration mode. The system comprises a working medium pump, a preheater, a heat regenerator, a gas heater, an expansion machine, a power generator, a compressor, a back pressure valve, a freezing evaporator, a refrigeration evaporator, a freezing expansion valve, a refrigeration expansion valve, a condenser, a freezing flow dividing three-way valve and a refrigeration flow dividing three-way valve. The system adopts CO2 as a cycle working medium, when the required refrigeration temperatures are different, the refrigeration flow dividing three-way valve and the freezing flow dividing three-way valve can be respectively adjusted to distribute the working medium flow entering a refrigeration loop, a freezing loop and a power generation loop, so that the combined cooling and power system has the capacity of large-range configuration and adjustment, and the refrigeration mode can be changed according to the refrigeration requirements; and switching of five operation modes including a refrigeration mode, a freezing mode, a freezing and refrigerating mode, a power generation mode and a cooling and power mode can be achieved by controlling and adjusting the opening degrees of the freezing flow dividing three-way valve and the refrigeration flow dividing three-way valve and different working states of the compressor and the expansion machine.

Description

technical field [0001] The invention belongs to thermodynamic cycle technology, in particular to a CO 2 Combined cooling and power generation system, suitable for large-scale adjustment of cooling and power and multi-cooling mode requirements. Background technique [0002] At present, waste heat recovery, as an important technical means of energy saving and emission reduction, has received more and more attention. Cooling power has become the two main energy output forms of the waste heat recovery system, and the cogeneration system driven by waste heat can meet multiple energy needs. For some specific applications, the requirements for cooling temperature are different, and the requirements for the two energy types of cooling and electricity are also different, so that the combined cooling and power generation system needs to have a wide range of adjustment capabilities, as well as two modes of refrigeration and freezing. Or the ability to run in parallel. At present, in...

AI Technical Summary

Problems solved by technology

At present, in the cascade and self-coupling combined cooling and power generation systems, the energy conversion direction of waste heat focuses on heat-to-electricity conversion. It is difficult to achieve a wide range of adjustment functions for different needs of cooling and power, and a single cooling mode cannot meet the requirements. Structural improvement is required for different cooling temperature requirements

Furthermore, utilizing only a single source of waste heat increases the system's loss, which limits the efficiency of waste heat recovery, it is necessary to set up multiple heat exchangers to achieve cascaded utilization of waste heat sources of different grades

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