LNG light hydrocarbon separation coupling supercritical CO2 recompression brayton/kalina combined cycle power generation system

Abstract

The invention discloses an LNG light hydrocarbon separation coupling supercritical CO2 recompression brayton / kalina combined cycle power generation system. The power generation system comprises an LNGlight hydrocarbon separation system, a concentrating solar heat collection cycle system, a supercritical CO2 recompression brayton cycle system, a kalina cycle system and a natural gas direct expansion system; the LNG light hydrocarbon separation system is used for C2 + light hydrocarbon resource recovery; the concentrating solar heat collection cycle system is used for photo-thermal conversion;and the supercritical CO2 recompression brayton cycle system, the kalina cycle system and the natural gas direct expansion system are used for LNG cold energy and high-temperature solar energy coupling power generation. According to the power generation system, the supercritical CO2 recompression brayton cycle power generation is carried out through solar energy in the daytime, waste heat discharged by supercritical CO2 recompression brayton cycle power generation is stored, and heat is continued to be provided for kalina cycle at night, so that the system reaches a continuous power generationstate, and the effective recovery of C2 + light hydrocarbon resources and the efficient complementary utilization between LNG cold energy and solar energy are realized; and the power generation system has the advantages of being reasonable and compact in structure, safe and flexible in control, efficient and energy-saving, high in practicability and low in 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 coupled supercritical CO 2 Recompression Brayton / Karina combined cycle power generation system. Background technique [0002] LNG (liquefied natural gas, liquefied natural gas) needs to be gasified to normal temperature before being supplied to users. LNG will release about 830-860kWh / kg of cold energy during the gasification process. If this part of cold energy can be utilized, it will produce huge economic benefits. The rich C2+ light hydrocarbon components 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 realize efficient utilization of LNG, but the utilization rate of LNG cold energy is not high. [0003] Supercritical CO 2 The recompressed ...

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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 CO 2 Recompression Brayton / Karina combined cycle power generation system, LNG light hydrocarbon separation process, supercritical CO 2 The combination of recompression Brayton cycle, Karina 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, greatly reduces the cost of solar thermal power generation; at the same time, the cascaded 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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