Light hydrocarbon separation coupling parallel regenerative organic Rankine cycle power generation system utilizing LNG cold energy

Abstract

A light hydrocarbon separation coupling parallel regenerative organic Rankine cycle power generation system utilizing LNG cold energy comprises an LNG light hydrocarbon separation system, a parallel organic Rankine cycle system with regenerative heat, a direct cooling system and a natural gas direct expansion system. The LNG light hydrocarbon separation system is used for recycling C2 + light hydrocarbon resources; the direct cooling system is used for cooling the cold using unit; the parallel organic Rankine cycle system with heat regeneration and the natural gas direct expansion system are used for LNG cold energy power generation; while the heat efficiency, efficiency and power generation efficiency of a circulating system are improved, the problems that in the prior art, LNG cold energy is insufficiently utilized, the cold utilization temperature level is not matched with the LNG temperature and the like are solved, stepped integrated utilization of the LNG cold energy, light hydrocarbon separation and direct cooling of LNG are achieved, and the energy efficiency of the system is improved. The device has the advantages of reasonable and compact structure, safety and flexibility in control, high efficiency, energy conservation, high practicability and low cost.

Description

technical field [0001] The invention relates to an LNG cold energy utilization system, in particular to an organic Rankine cycle power generation system utilizing LNG cold energy for light hydrocarbon separation coupling parallel connection heat recovery. 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. [0003] 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 this technology can only use the cold energy of LNG in a certain temperature range, resulting in a lot of...

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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 light hydrocarbon separation coupled parallel regenerative organic Rankine cycle power generation system utilizing LNG cold energy. The combination of circulation, direct cooling technology and natural gas direct expansion power generation technology can simultaneously realize the effective recovery of C2+ light hydrocarbon resources with high added value and the cascade efficient utilization of LNG cold energy, and solve the problem of insufficient utilization of LNG cold energy and the use of cold temperature. It has the advantages of reasonable and compact structure, safe and flexible control, high efficiency and energy saving, strong practicability and low cost.

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