Combined cooling heating and power system based on liquefied natural gas gasification cold energy and running method

Abstract

The invention discloses a combined cooling heating and power system based on liquefied natural gas gasification cold energy and a running method, and belongs to the field of heating and refrigerationcombined systems. In the system, a low-temperature boiler, an expander, an LNG gasifier and a working medium pump are sequentially connected through a pipeline to form a loop. The expander is connected with a main shaft of a power generator. An LNG storage tank, the LNG gasifier, a main temperature increasing device, a pressure regulator, a metering and odorization device and a gas pipe network are sequentially connected through a pipeline. An outlet of an air heating tower, a first pump, the low-temperature boiler, the main temperature increasing device and an inlet of the air heating tower are sequentially connected to form a loop. A cold user is connected with the system in a plurality of ways. On the basis of improving the process energy efficiency of a liquefied natural gas gasification station, a multi-energy comprehensive utilization integrated technical solution based on the liquefied natural gas gasification cold energy is disclosed, various cold energy, industrial waste heat,geothermal energy and other renewable energy sources are comprehensively utilized to improve the energy efficiency of an energy system in China, and requirements of different load characteristics aremet.

Description

technical field [0001] The invention belongs to the technical field of combined heating and cooling systems, and specifically relates to a combined heat, power and cooling system based on liquefied natural gas gasification cold energy and an operation control method. Background technique [0002] On the one hand, there is a large amount of low-grade heat such as low-temperature waste heat, air energy and geothermal energy in the industrial production process, which is difficult to efficiently recover and utilize. On the other hand, there is a large amount of ultra-low temperature cold energy in the LNG gasification station, which is difficult to use and consumes a lot of energy. For heating natural gas. Conventional heat utilization and cold utilization technologies are difficult to fully tap the existing low-grade heat and ultra-low temperature cold energy in the gasification process of LNG, and its energy efficiency is low, and the economic benefits are poor. These low-gr...

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Problems solved by technology

[0002] On the one hand, there is a large amount of low-grade heat such as low-temperature waste heat, air energy and geothermal energy in the industrial production process, which is difficult to efficiently recover and utilize. On the other hand, there is a large amount of ultra-low temperature cold energy in the LNG gasification station, which is difficult to use and consumes a lot of energy. for heating natural gas

Conventional heat utilization and cold utilization technologies are difficult to fully tap the existing low-grade heat and ultra-low temperature cold energy in the gasification process of LNG, and its energy efficiency is low, and the economic benefits are poor

These low-grade heat and ultra-low temperature cold energy contain a large amount of useful energy, but they are wasted due to the lack of efficient utilization technology, which leads to low energy efficiency, high energy consumption, and high operating costs of LNG gasification stations and industrial production processes

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