A 1ng light hydrocarbon separation coupled with supercritical CO2 recompression Brayton organic Rankine combined cycle power generation system

Abstract

An LNG light hydrocarbon separation coupled with supercritical CO2 recompression Brayton organic Rankine combined cycle power generation system, including an LNG light hydrocarbon separation system, a concentrating solar heat collection cycle system, a supercritical CO 2 Recompression Brayton cycle system, organic Rankine cycle system and natural gas direct expansion system; LNG light hydrocarbon separation system for the recovery of C2+ light hydrocarbon resources; concentrating solar heat collection cycle system for photothermal conversion; supercritical CO 2 Recompression Brayton cycle system, organic Rankine cycle system and natural gas direct expansion system are used for LNG cold energy and high temperature solar energy coupled power generation; the present invention utilizes solar energy for supercritical CO during daytime 2 Recompress the Brayton cycle to generate electricity, and store the waste heat discharged from it, and continue to provide heat for the organic Rankine cycle at night, so that the system can achieve a state of continuous power generation, realizing the effective recovery of C2+ light hydrocarbon resources and the efficient complementation of LNG cold energy and solar energy The utility model has the advantages of reasonable and compact structure, safe and flexible control, high efficiency and energy saving, strong practicability and low cost.

Description

technical field [0001] The invention relates to a complementary utilization system of LNG cold energy and solar energy, in particular to an LNG light hydrocarbon separation coupling supercritical CO2 recompression Brayton organic Rankine combined cycle power generation system. Background technique [0002] LNG (liquefied natural gas, liquefied natural gas) needs to be gasified to normal temperature and then supplied to users. LNG will release about 830-860kWh / kg of cold energy during the gasification process. If this part of the cold energy can be utilized, it will produce huge economic benefits. The C2+ light hydrocarbon components rich in LNG are very high-quality chemical raw materials, which can be used to produce many petrochemical products with high added value. Using LNG cold energy to separate its own light hydrocarbon components can achieve efficient utilization of LNG, but the utilization rate of LNG cold energy is not high. [0003] supercritical CO 2 The recom...

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Problems solved by technology

[0005] In order to solve the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a kind of LNG light hydrocarbon separation coupling supercritical CO2 recompression Brayton Organic Rankine combined cycle power generation system, this system combines LNG light hydrocarbon separation process, supercritical CO 2 The combination of recompression Brayton cycle, organic Rankine cycle, solar thermal power generation technology and natural gas direct expansion power generation technology can not only effectively recover C2+ light hydrocarbon resources with high added value, but also realize the efficient complementarity of LNG cold energy and solar energy Utilization; while solving the problem of uneven distribution of solar energy over time, it greatly reduces the cost of solar thermal power generation; at the same time, the cascade utilization of LNG cold energy effectively improves the thermal efficiency and power generation efficiency of the power generation system; it has a reasonable and compact structure, control The advantages of safety and flexibility, high efficiency and energy saving, strong practicability and low cost

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