Rankine cycle system with phase change energy storage heat exchanger

Abstract

The invention provides a Rankine cycle system with a phase change energy storage heat exchanger. The Rankine cycle system comprises an overheating heat exchanger, heat-into-power conversion equipment, a condensation heat exchanger and a pump which are sequentially connected in series. The heat-into-power conversion equipment is connected with an electric generator. The Rankine cycle system further comprises the phase change energy storage heat exchanger and a preheating heat exchanger. One end of the phase change energy storage heat exchanger is connected with one end of the preheating heat exchanger, and the other end of the phase change energy storage heat exchanger is connected with the overheating heat exchanger. The other end of the preheating heat exchanger is connected with the pump. According to the Rankine cycle system provided by the invention, the phase change energy storage heat exchanger is combined with an existing Rankine cycle technology, the small heat transfer temperature difference between a working medium at the evaporation stage and a heat-transfer medium in cycle is guaranteed, the heat transfer temperature difference is kept unchanged, and the exergy loss of the system is reduced.

Description

technical field [0001] The invention relates to a Rankine cycle system, in particular to a Rankine cycle system with a phase change energy storage heat exchanger, belonging to the technical field of energy and power. Background technique [0002] The Rankine cycle is a thermodynamic cycle that converts heat energy into work. The Rankine cycle absorbs heat from the outside, and heats its closed-loop working fluid to do work. The Rankine cycle has the following four processes: [0003] 1. The working medium is compressed by the pump, and the liquid will rise from low pressure to high pressure, becoming high pressure liquid; [0004] 2. The high-pressure liquid is heated, and under constant pressure, the high-pressure liquid absorbs the external heat source and becomes saturated steam or superheated steam; [0005] 3. After the steam expands, it will drive the turbine to generate electricity, so the temperature and pressure of the steam will decrease and become wet steam; ...

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Problems solved by technology

[0010] The existing double-tank and single-tank heat storage systems are all conventional sensible heat storage technologies. During the phase change process of the working fluid, the temperature of the working fluid remains unchanged, while the temperature of the heat transfer fluid gradually decreases. The thermal temperature difference is large, and the exergy loss of the system is large

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