Organic rankine cycle power generation system

Abstract

The invention provides an organic rankine cycle power generation system. An evaporation device is internally provided with a first heat exchanger and a second heat exchanger which are connected through a first circulating pipeline, and the first circulating pipeline is internally provided with a first duplex fluid working medium which contains first liquid metal and a first organic working medium.Meanwhile, a condensing device is provided with a third heat exchanger and a fourth heat exchanger which are connected through a second circulating pipeline, and the second circulating pipeline is internally provided with a second duplex fluid working medium which contains second liquid metal and a second organic working medium. Due to the high heat conductivity of the liquid metal in the two duplex fluid working media, heat can be rapidly dispersed, the heat releasing efficiency of a heat source medium, the heat absorbing efficiency of a cold source medium and the heat absorbing efficiency and the heat releasing efficiency of the organic working media in an organic rankine cycle pipeline are improved, meanwhile, by means of latent heat of phase change of the organic working media contained in the duplex fluid working media, much heat can be stored, higher efficient heat transmission and better heat matching of the working media on the two sides of the heat exchanger are achieved, andtherefore the power generation system efficiency is improved as a whole.

Description

technical field [0001] The invention relates to the technical field of utilization of low-grade heat energy, and more specifically relates to an organic Rankine cycle power generation system. Background technique [0002] Utilization of low-grade thermal energy is an important way to solve energy problems. Low-grade thermal energy includes industrial low-temperature waste heat and geothermal energy, solar energy, and biomass energy in the field of new energy. The utilization of low-grade thermal energy can not only improve energy utilization, promote energy conservation and emission reduction, but also optimize the energy supply structure, which has important practical significance. [0003] Organic Rankine Cycle Power Generation (ORCPG) is a proven power generation system that can convert low-grade thermal energy into electrical energy. The system uses low-grade thermal energy to heat organic working fluid through an evaporation device to generate Organic working medium st...

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Problems solved by technology

[0004] At present, the organic Rankine cycle power generation system uses the heat source medium of low-grade heat energy to directly exchange heat with the organic working medium in the evaporation device. However, there are various types of heat source medium for low-grade heat energy. Most of the low-grade heat energy The heat source medium does not undergo phase change after cooling down, which belongs to sensible heat release, while the organic working medium turns into steam after absorbing heat, and undergoes phase change, and there is latent heat of phase change, which makes the heat transfer temperature difference between different positions in the evaporation device change greatly. Large, it is not conducive to heat transfer, and the efficiency of heat transfer of the system decreases

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