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

A technology of liquefied natural gas and cogeneration of heat, power and cooling, which is applied in the field of combined heating and refrigeration systems, and can solve problems such as lack of efficient utilization of technology, waste, and difficulty in fully excavating

Active Publication Date: 2021-02-09
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Effect test

Embodiment 1

[0079] The system of embodiment 1 forms two different operation methods according to the actual needs of different regions, cold user 41, cold storage tank 44, air heating tower 312 and shallow buried pipe heat exchanger 311:

[0080] Such as figure 2 In the shown operation method 101, for hot summer and cold winter regions, the cold user 41, the air heating tower 312, and the buried pipe heat exchanger 311 are connected in parallel:

[0081] The refrigerant return line of the cooling user 41 is connected in parallel with the cooling water return line of the air heating tower and the return line branch of the buried pipe heat exchanger 311, and the water supply lines of the three are connected in parallel, and the refrigerant return line is connected with the low-temperature boiler 11 The refrigerant outlet on the cold side of the low-temperature boiler 11 is connected to the refrigerant outlet on the hot side of the user warmer 46, and the refrigerant inlet of the user warme...

Embodiment 2

[0110] Embodiment 2 If only judged according to cooling and heating load demands, three different operation modes are adopted according to demands:

[0111] Such as Figure 9 In the operation mode 201 shown, in the non-heating and non-cooling period, the heat medium of the low-grade heat source 321 first enters the low-temperature boiler 11 of the low-temperature thermal power generation sub-system to release heat and cool down, and then enters the main temperature booster 22 to further heat the low-temperature gasified natural gas While continuing to release heat, the cooled heat medium returns to the low-grade heat source 321 through the heat medium pipeline to be heated and raised, so that the cycle continues; pipeline;

[0112] For the liquefied natural gas gasification subsystem, the LNG vaporizer 15 is first heated by the low-temperature steam of the power generation sub-system to become a low-temperature gaseous natural gas, and then enters the main temperature booster...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B29/00F25B30/04F24D3/10F24D3/18F24D19/10F01B23/10F01K11/00F01K13/00F01K25/10F17C9/04F17C13/00F17D1/02F17D3/01F17D3/12
CPCF01B23/10F01K11/00F01K13/00F01K25/10F17C9/04F17C13/00F17C2221/033F17C2223/0161F17C2225/0123F17C2227/03F17C2227/039F17C2265/07F17D1/02F17D3/01F17D3/12F24D3/1058F24D3/18F24D19/1006F25B29/006F25B30/04Y02B10/40
Inventor 孙方田宁栗康
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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