Trans-critical CO2 mixed working medium back pressure injection type combined cooling and power supply system with separator

Abstract

The invention discloses a trans-critical CO2 mixed working medium back pressure injection type combined cooling and power supply system with a separator. Two sets of combined cooling and power supplysystems are constructed, in the case of each set of combined cooling and power supply system, the separator are introduced into the system, an outlet working medium of an injector is condensed to a two-phase region firstly, then component separation is performed on the mixed working medium of the two-phase region through the separator, and the separated two flows of CO2 mixed working medium containing different mass component concentrations are used for refrigeration and power generation correspondingly; according to the difference of the mixed working medium component concentrations adopted in refrigeration, the trans-critical CO2 mixed working medium back pressure injection type combined cooling and power supply system with the separator is divided into two types, namely, a HCO2R type back pressure injection type combined cooling and power supply system with the separator and a LCO2R type back pressure injection type combined cooling and power supply system with the separator; and according to the trans-critical CO2 mixed working medium back pressure injection type combined cooling and power supply system with the separator, the problem that a traditional back pressure injectiontype combined cooling and power supply system does not fully utilize the CO2 mixed working medium component separation characteristic is solved, the trans-critical CO2 mixed working medium back pressure injection type combined cooling and power supply system with the separator aims to further improve the thermodynamic performance of the system, and a plurality of key thermodynamic parameters suchas the heat efficiency and the exergy efficiency of the system are expected to be improved through simulation regulation and control and experimental research.

Description

technical field [0001] The invention belongs to the technical field of medium and low temperature heat energy recovery and power engineering, and specifically relates to a transcritical CO 2 Mixed working fluid back pressure injection combined cooling and power generation system. Background technique [0002] The traditional back pressure injection combined cooling and power system such as figure 1 shown. It is mainly composed of heater, turbine, ejector, condenser, throttle valve, evaporator and booster pump. The low-temperature and high-pressure working medium at the outlet of the booster pump is heated by the heater and heat source, and then enters the turbine to expand and do work to drive the generator to generate electricity. The exhaust gas from the turbine enters the ejector, and the flow rate of the working medium in the ejector nozzle increases sharply while the pressure decreases sharply, thereby forming a high vacuum environment in the mixing chamber, and inje...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a transcritical CO 2 The mixed working fluid back pressure injection combined cooling and power generation system solves the problem that the traditional back pressure injection combined cooling and power generation system does not make full use of CO 2 The problem of separation characteristics of mixed working fluid components

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