Inner thermal storage solar low-temperature thermal power generation system

Abstract

The invention relates to an inner thermal storage solar low-temperature thermal power generation system. The power generation system comprises a compound parabolic heat collector system, a thermal storage system and an organic Rankine cycle power generation system, wherein, the compound parabolic heat collector system comprises a high-temperature end compound parabolic heat collector array and a low-temperature end compound parabolic heat collector array; the thermal storage system comprises a liquid storage tank, a coil and a phase-change material; and the coil is evenly distributed in the liquid storage tank and the coil is internally filled with the phase-change material. The organic Rankine cycle power generation system comprises an evaporator, a steam turbine, a motor, a heat regenerator, a condenser, two pumps and six valves. Compared with the traditional solar thermal power generation system, the inner thermal storage solar low-temperature thermal power generation system is characterized in that: an inlet end of the steam turbine is provided with a phase-change thermal storage system which usually has very small power of thermal storage and heat release, thus reducing the average heat-exchange temperature difference between the phase-change material and an organic working substance; and on the other hand, a two-stage evaporator of a two-phase region and a liquid region is adopted in the system, thus being capable of reducing heat transfer irreversibility between heat-transfer fluid and the organic working substance, and lowering the average operating temperature of the heat collectors.

Description

technical field [0001] The invention relates to the technical field of solar power generation. Background technique [0002] Solar thermal power generation technology is an important means for human beings to develop solar energy. During the past 20 years, many large-scale power plants of the megawatt level have been built around the world, such as the SEGS power plant in the United States. In recent years, domestic breakthroughs have been made in solar thermal power generation concentrating heat collection technology and high-temperature receiver technology, and the first tower-type solar thermal power generation demonstration project has been built [1] . However, currently operating solar thermal power generation systems generally use the water vapor Rankine cycle of traditional thermal power plants. The thermophysical characteristics of water vapor require that the temperature of the heat source generally be above 370°C to operate efficiently. [2] . For solar thermal ...

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Problems solved by technology

In order to solve the problem that the average heat transfer temperature difference between the organic working fluid and the heat exchange medium of the heat collector in the single-stage evaporator is relatively large, resulting in a high average operating temperature of the heat collector, the present invention further proposes a solar low-temperature thermal power generation system with a two-stage evaporator system

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