Variable component multi-pressure evaporation non-azeotropic refrigerant Rankine cycle system with ejector

Abstract

The invention discloses a variable component multi-pressure evaporation non-azeotropic refrigerant Rankine cycle system with an ejector. The variable component multi-pressure evaporation non-azeotropic refrigerant Rankine cycle system comprises an expander, a circulating pump, an evaporator, a condenser and the gas-liquid ejector. A working fluid outlet of the expander is connected with a workingfluid inlet of the gas-liquid ejector, and an exhaust steam outlet of the expander is connected with the condenser. A pipeline is arranged on the middle portion of the condenser and connected with a low-pressure ejection fluid inlet of the gas-liquid ejector, and the condenser is connected to a mixed refrigerant inlet of the evaporator through the circulating pump. A mixed refrigerant outlet of the evaporator is connected to an inlet of the expander. A high-boiling-point high-pressure liquid outlet of the gas-liquid ejector is connected with the mixed refrigerant inlet of the evaporator. The system has a simple structure, high work efficiency and energy saving and environmental protection.

Description

technical field [0001] The invention relates to the technical field of power generation equipment, in particular to a variable-component multi-pressure evaporation non-azeotropic working medium Rankine cycle system with an injector that can improve thermal performance. Background technique [0002] Organic Rankine Cycle (ORC) is a technology that uses low-temperature renewable energy such as solar energy, geothermal energy, and industrial waste heat, and medium-low temperature waste heat for thermal energy-to-electrical energy conversion. Compared with Rankine cycle, Kalina cycle and thermoelectric conversion, organic Rankine cycle has become a research hotspot due to its characteristics of suitable pressure, lower cost and higher recovery efficiency. However, the main problems at present are the high initial investment cost and low efficiency, which have become the main obstacles to its current large-scale application. Therefore, there is an urgent need to solve the proble...

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Problems solved by technology

How to deal with the deterioration of system performance caused by changes in working conditions and to propose reasonable design methods and operation strategies has become an urgent problem to be solved

In order to avoid the leakage of working fluid, the traditional ORC system can only be designed according to the working conditions in summer, so in other seasons, its thermal performance is limited

Although the existing non-azeotropic organic Rankine cycle can adjust the flow rate to adapt to the change of cold source parameters, it is limited by the design parameters of heat exchange equipment, and the adjustment flexibility for changing working conditions is poor, and the adjustment range is limited.

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