Supercritical CO2 recompression Brayton and LNG combined cycle power generation system

Abstract

The invention discloses a supercritical CO2 recompression Brayton and LNG combined cycle power generation system. The supercritical CO2 recompression Brayton and LNG combined cycle power generation system comprises a light-concentrating solar heat collection cycle, a supercritical CO2 recompression Brayton cycle, an LNG two-stage Rankine cycle and a natural gas direct expansion system, wherein thelight-concentrating solar heat collection cycle enables high-temperature molten salt to absorb heat from a solar heat absorber and transfer the heat to the supercritical CO2 power generation system;and LNG is introduced into the supercritical CO2 recompression Brayton cycle, the LNG participates in the two-stage Rankine cycle to cool an organic working medium A and an organic working medium B, then CO2 is precooled, and finally expansion power generation is carried out. According to the supercritical CO2 recompression Brayton and LNG combined cycle power generation system, power generation is mainly carried out by means of supercritical CO2 in the daytime, waste heat discharged by the supercritical CO2 is stored, and then the waste heat is provided for the organic Rankine cycle for powergeneration at night, so that the difficulty of high-temperature heat storage is avoided while the problem of uneven solar time distribution is solved, the system can reach a continuous power generation state, and utilization of clean energy is realized; and the supercritical CO2 recompression Brayton and LNG combined cycle power generation system has the advantages of being reasonable and compactin structure, flexible to control, safe, efficient, energy-saving and environment-friendly.

Description

technical field [0001] The invention relates to a power generation system, in particular to a supercritical CO 2 Recompression Brayton and LNG combined cycle power generation systems. Background technique [0002] At present, there are two main ways of generating electricity using solar energy: photovoltaic and photothermal. Among them, photothermal power generation uses the optical system to gather solar radiation energy to heat the working medium to generate high-temperature steam, thereby driving the steam turbine to generate electricity. Compared with photovoltaic power generation, solar thermal power generation has the advantages of economy, environmental protection and safety, and is currently the most promising way of large-scale utilization of solar energy. Supercritical CO 2 The Brayton cycle has the advantages of simple system, compact structure, high thermal efficiency, safety and environmental protection, etc., and has a good application prospect in the field ...

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Problems solved by technology

[0004] In order to overcome the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of supercritical CO 2 recompression Brayton and LNG combined cycle power generation system that incorporates supercritical CO 2 The cycle, organic Rankine cycle and natural gas direct expansion power generation technologies are applied to the field of solar thermal power generation and LNG cold energy utilization, which can realize the efficient complementary utilization of solar energy and LNG cold energy, solve the problem of uneven distribution of solar energy over time, and avoid LNG cold energy. It can effectively improve the thermal efficiency and power generation efficiency of the combined power generation system; it has the advantages of reasonable and compact structure, flexible control, safety, high efficiency, energy saving and environmental protection

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