Refrigerating system using liquefied natural gas cold energy

Abstract

The invention relates to a refrigerating system using liquefied natural gas cold energy, which comprises a first-stage indirect type heat exchanger, a second-stage indirect type heat exchanger, an air inlet pipeline, a fan and an air mixing device. The inlet of the air inlet pipeline is connected with the fan, the outlet of the air inlet pipeline is connected with the air inlets of the first-stage indirect type heat exchanger and the second-stage indirect type heat exchanger and the inlet of the air mixing device, the fuel gas inlet of the first-stage indirect type heat exchanger is used for receiving liquefied natural gas, the fuel gas outlet of the first-stage indirect type heat exchanger is connected with the fuel gas inlet of the second-stage indirect type heat exchanger, the inlet of the air mixing device is further connected with the air outlet of the first-stage indirect type heat exchanger and the air outlet of the second-stage indirect type heat exchanger, the outlet of the air mixing device is used for outputting cooled air. When the liquefied natural gas enters the first-stage indirect type heat exchanger, heat exchanging with the air in the first-stage indirect type heat exchanger is carried out, and the liquefied natural gas is heated and enters the second-stage indirect type heat exchanger after being converted into compressed natural gas. The invention not only can fully use the cold energy generated in a gasification process of the liquefied natural gas, but also can reduce cost of heat-exchange equipment.

Description

Technical field [0001] The invention belongs to the technical field of the cold energy utilization of liquefied natural gas, and specifically relates to a refrigeration system utilizing the cold energy of liquefied natural gas. Background technique [0002] With the rapid development of the natural gas industry, LNG (liquefied natural gas) is often used as a fuel in distributed energy systems. Natural gas is generally used in gaseous form, but LNG is more convenient for transportation and storage. Liquefied natural gas generally needs to be used in the form of CNG (compressed natural gas) after gasification. A large amount of cold energy will be generated during the gasification process, but at present, the large amount of cold energy generated during the gasification process of LNG is basically not used . In traditional LNG application methods, air, steam or electricity are generally used directly for gasification. The gasified LNG is formed into CNG and then transported to dow...

AI Technical Summary

Problems solved by technology

Liquefied natural gas generally needs to be utilized in the form of CNG (compressed natural gas) after gasification treatment, and a large amount of cold energy will be generated during the gasification process, but at present, the large amount of cold energy generated by LNG in the gasification process is basically not used

In traditional LNG application methods, air, steam or electricity are generally used directly for gasification. The gasified LNG forms CNG and is transported to the downstream process for use. The cold energy of LNG is basically not well utilized.

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