a supercritical co 2 Recompression Brayton and lng combined cycle power generation systems

Abstract

A supercritical CO 2 Recompression Brayton and LNG combined cycle power generation systems, including concentrated solar thermal cycle, supercritical CO 2 Recompression Brayton cycle, LNG two-stage Rankine cycle and natural gas direct expansion system; among them, the concentrating solar heat collection cycle makes the high-temperature molten salt absorb heat from the solar heat absorber and transfer the heat to supercritical CO 2 Power generation system; by introducing LNG into supercritical CO 2 In the recompression Brayton cycle, LNG participates in the two-stage Rankine cycle to cool the organic working medium A and the organic working medium B respectively, and then cools the CO 2 Pre-cooling, and finally expansion to generate electricity; the invention mainly relies on supercritical CO during the day 2 Power generation, and store the exhausted waste heat, and then provide it to the organic Rankine cycle power generation at night, which solves the uneven distribution of solar energy time and avoids the difficulty of high temperature heat storage, so that the system can achieve continuous power generation and realize the utilization of clean energy , has the advantages of reasonable and compact structure, flexible control, safety and high efficiency, energy saving and environmental protection.

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 ...

AI Technical Summary

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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