A system for comprehensive utilization of lng cold energy for power generation and cooling

Abstract

The invention relates to a system for comprehensively utilizing LNG cold energy for power generation and cold supply. The system comprises a LNG supercharging gasification direct expansion power generation system, a mixed working medium Rankine cycle power generation system, a liquid ammonia refrigeration house cold supply system and an ethylene glycol ice storage bath air conditioner cold supplycirculation system. The cold energy released in the LNG gasification process is utilized; high-grade electric energy is generated through LNG supercharging gasification direct expansion power generation and mixed working medium Rankine cycle power generation; cold is supplied to a refrigeration house through the cold energy released in the LNG gasification process for ammonia recycling; and cold is supplied to an air conditioner through the cold energy released in the LNG gasification process for ethylene glycol ice storage bath recycling. By means of the system, gradient utilization of the LNG cold energy is achieved, and the cold energy utilization efficiency is high.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of low-temperature cold energy of natural gas, in particular to a system for comprehensively utilizing LNG cold energy for power generation and cooling supply. Background technique [0002] Liquefied natural gas (LNG) has gradually become one of the main energy sources due to its convenient transportation, clean environmental protection, high efficiency and energy saving. When LNG is gasified, a large amount of cold energy is released. In the traditional LNG gasification process, this part of the cold energy is taken away by air or seawater. , a large amount of high-grade cold energy is thus wasted. Although there are many schemes for LNG cold energy recovery and utilization, there are still problems such as low efficiency of cold energy utilization, non-step utilization of LNG cold energy, many moving equipment, and complicated processes. Contents of the invention [0003] In ...

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Problems solved by technology

[0002] Liquefied natural gas (LNG) has gradually become one of the main energy sources due to its convenient transportation, clean environmental protection, high efficiency and energy saving. When LNG is gasified, a large amount of cold energy is released. In the traditional LNG gasification process, this part of the cold energy is taken away by air or seawater. , a large amount of high-grade cold energy is wasted

Although there are many schemes for LNG cold energy recovery and utilization, there are still problems such as low efficiency of cold energy utilization, non-step utilization of LNG cold energy, many moving equipment, and complicated processes.

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