Combined heat, power and cooling system and operation method based on liquefied natural gas gasification cold energy

Abstract

The invention discloses a heat, power and cooling cogeneration system based on liquefied natural gas gasification cold energy and an operation method belonging to the field of combined heating and refrigeration systems; in the system, a low-temperature boiler, an expander, an LNG vaporizer and a working medium pump The pipelines are connected in sequence to form a loop; the expander is connected to the main shaft of the generator; the LNG storage tank, LNG vaporizer, main temperature booster, pressure regulator, metering and odorizing device and the gas pipeline network are connected in sequence through pipelines; the outlet of the air heating tower, The first pump, the low-temperature boiler, the main warmer and the inlet of the air heating tower are connected in sequence to form a loop, and the cold users are connected to the system in various ways. On the basis of improving the process energy efficiency of the LNG gasification station, the present invention proposes a multi-energy comprehensive utilization integrated technical solution based on the LNG gasification cold energy, and comprehensively utilizes various cold energies and renewable energy such as industrial waste heat and geothermal energy. Improve the energy efficiency of my country's energy system to meet the needs of different load characteristics.

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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