Regenerative cycle type ORC (organic Rankine cycle) power generation system utilizing LNG (liquid nature gas) cold energy and industrial waste heat

Abstract

The invention discloses a regenerative cycle type ORC (organic Rankine cycle) power generation system utilizing LNG (liquid nature gas) cold energy and industrial waste heat. The system comprises an LNG gasification loop, an ORC power generation loop and an industrial waste heat loop. Cold energy in the LNG gasification loop and heat energy in the industrial waste heat loop are utilized in the ORCpower generation loop, and a bypass loop is arranged in the ORC power generation loop to ensure safety high-efficiency running of an expansion machine. The regenerative cycle type ORC power generation system utilizing the LNG cold energy and the industrial waste heat has the advantages that an LNG cold energy recovery method is improved on the basis of existing ORC, the cold energy released in anLNG gasification process is fully utilized through a three-fluid heat exchanger and a heat regenerator, thermal stress during LNG cold energy utilization and thermal load of an evaporator are reduced, and the efficiency of the ORC power generation system is effectively improved. The regenerative cycle type ORC power generation system can be widely applied to the fields of power generation by theLNG cold energy and industrial waste heat recovery.

Description

Technical field: [0001] The invention belongs to the field of power engineering, and relates to an LNG cold energy and industrial waste heat utilization system, in particular to an ORC power generation system based on a three-fluid heat exchanger and a regenerator. Background technique: [0002] Liquefied natural gas (Liquid Nature Gas, LNG) is a clean energy, in line with international and my country's energy structure optimization and the development direction of low-carbon economy. At the same time, global climate change and greenhouse gas emission control have further promoted the development of LNG. LNG is good for storage and transportation, but it must be gasified before it can be used. The storage temperature of LNG is -162°C, while the gas temperature required for use is 20°C. During the whole gasification process, the cooling capacity released per unit mass of LNG is about 830 kJ. [0003] The Organic Rankine Cycle (ORC) can use the cold and heat generated in th...

AI Technical Summary

Problems solved by technology

This system considers the full utilization of energy, but the structure of the secondary ORC cycle is complex, and the cycle efficiency affects each other. It does not consider the thermal stress caused by the large temperature difference in the heat exchange process between LNG and circulating working fluid.

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