Gas-liquid injection type ORC system

Abstract

The invention provides a gas-liquid injection type ORC system. According to the gas-liquid injection type ORC system, a gas-liquid injector is added in a traditional ORC system, a cycle is divided into a primary loop and an auxiliary loop, and cascade heat exchange is formed through a first-stage evaporator and a second-stage evaporator. A liquid-state working medium of the primary loop enters the first-stage evaporator through a working medium pump and is converted to a high-temperature and high-pressure gas-state working medium, the high-temperature and high-pressure gas-state working medium of the primary loop and a low-temperature liquid-state working medium of the auxiliary loop are led in the gas-liquid injector through the boost characteristic and ejection characteristic of the gas-liquid injector, the pressure of a fluid is further increased in the gas-liquid injector, the fluid enters the second-stage evaporator to be evaporated and enters a turbine to apply work, and finally enters a condenser to complete the whole cycle. The gas-liquid injection type ORC system solves the problem of low efficiency of a small ORC system, reduces the power consumption of the working medium pump in the case of no additional power consumption, increases the inlet pressure of the turbine, and increases the output work of the turbine, thus increasing the efficiency of the system.

Description

technical field [0001] The invention belongs to the technical field of organic Rankine cycle power generation, and in particular relates to an ORC system which not only reduces the power consumption of a working medium pump, but also has a gas-liquid injector which increases the output work, and is especially suitable for a small ORC system. Background technique [0002] With the increase of energy demand, the shortage of energy and the increasingly serious problem of environmental pollution, the development of renewable energy and the recycling of low-grade energy have been paid more and more attention, which has become an important way to solve the energy crisis and plays an important role in reducing environmental pollution. significance. Among the many ways of renewable energy utilization and low-grade energy recovery, the Organic Rankine Cycle (ORC) is a Rankine cycle with low-boiling organic matter as the working medium, mainly composed of heat exchangers (boilers, eva...

AI Technical Summary

Problems solved by technology

However, the biggest problem encountered in the miniaturization development of the ORC system is: low system efficiency

The low efficiency of the working fluid pump is the main constraint on the efficiency of small ORC systems

[0004] Therefore, the miniaturization development of ORC must solve the problems of high power consumption of the working fluid pump and low system efficiency

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