A combined power cycle power generation system utilizing high temperature solar energy and lng cold energy

Abstract

A combined power cycle power generation system using high-temperature solar energy and LNG cold energy, including tower-type concentrating solar collector heat collection cycle, S‑CO 2 Recompression Brayton cycle, Kalina cycle, natural gas direct expansion process; the invention makes the high-temperature molten salt absorb heat from the solar heat absorber through the concentrating solar heat collection cycle in the daytime, and transfers the heat to S‑CO 2 Recompress the Brayton cycle system to generate electricity, store the exhausted waste heat, and provide it to the Karina cycle to generate electricity at night; while solving the problem of uneven solar time distribution, it avoids the difficulty of high-temperature heat storage and recycles LNG cold energy , avoiding the loss of cold energy, can effectively improve the efficiency of the combined power generation system, and has the advantages of compact structure, flexible control, high efficiency and energy saving, low cost and strong practicability.

Description

technical field [0001] The invention relates to a power generation system, in particular to a combined power cycle power generation system utilizing high-temperature solar energy and LNG cold energy. Background technique [0002] As a renewable new energy source, solar energy has become one of the important choices for coping with energy shortage, climate change, energy saving and emission reduction. For high temperature heat sources, S-CO 2 (supercritical carbon dioxide, supercritical carbon dioxide) Brayton cycle has the advantages of small size, high thermal efficiency, safety and environmental protection, and is the most potential thermal cycle form in the next generation of solar thermal power generation systems. But the technology suffers from the uneven distribution of solar energy over time. [0003] LNG (liquefied natural gas, liquefied natural gas) needs to be heated and gasified by a gasifier to become normal temperature natural gas for use by users. LNG releas...

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Problems solved by technology

[0004] In order to solve the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a combined power cycle power generation system utilizing high-temperature solar energy and LNG cold energy, which uses S-CO 2 Cycle, Karina cycle and natural gas direct expansion power generation technologies are applied to the field of solar thermal power generation and LNG cold energy utilization. While solving the problem of uneven solar time distribution, it avoids the difficulty of high-temperature heat storage, improves power generation efficiency, and Significantly reduce the cost of solar thermal power generation; at the same time, the cascade utilization of LNG cold energy avoids the loss of cold energy and effectively improves the thermal efficiency and power generation efficiency of the combined power generation system; it has compact structure, flexible control, high efficiency and energy saving, low cost and practicality Advantages of being strong

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