Combined power cycle power generation system utilizing high-temperature solar energy and LNG cold energy

Abstract

The invention discloses a combined power cycle power generation system utilizing high-temperature solar energy and LNG cold energy, which comprises a tower type concentrating solar heat collector heatcollection cycle, an S-CO2 recompression Brayton cycle, a Kalina cycle and a natural gas direct expansion process. In the daytime, high-temperature molten salt absorbs heat from a solar heat absorberthrough the concentrated solar heat collection cycle, the heat is transferred to the S-CO2 recompression Brayton cycle system for power generation, waste heat discharged by the S-CO2 recompression Brayton cycle system is stored, and the waste heat is provided for Kalina cycle power generation at night; the problem of uneven solar energy time distribution is solved, meanwhile, the difficulty of high-temperature heat storage is avoided, LNG cold energy is recycled, cold energy losses are avoided, the efficiency of the combined power generation system can be effectively improved, and the systemhas the advantages of being compact in structure, flexible in control, efficient, capable of saving energy, low in cost and high in 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...

AI Technical Summary

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

Images