Method for using cooling capacity of LNG with cooling media as medium and apparatus thereof

Abstract

The utilization of liquefied natural gas with coolant as medium mainly refers to the coolant as the medium to exchange heat with liquefied natural gas in the receiving station, and sending cooled coolant through coolant heat insulation pipe to the cooled energy utilization zone outside the receiving station for customer's use. The equipment applying this method comprises a liquefied natural gas pump, a sea water carburetor, a low temperature heat exchanger, a coolant low temperature reserving tank, a low temperature coolant pump, a coolant normal temperature reserving tank and normal temperature coolant pump. It is simple in operation, convenient to control, feasible to set multi big scale cooled energy utilization to make the best of it.

Description

technical field [0001] The invention relates to the technical field of utilization of liquefied natural gas (LNG) cooling capacity, in particular to a method and device for utilizing the cooling capacity of liquefied natural gas (LNG) using refrigerant as a medium. Background technique [0002] According to the national plan to accelerate the development of the natural gas industry with equal emphasis on development and introduction, my country will build several large-scale LNG receiving stations in the southeast coastal areas before 2010, importing tens of millions of tons of LNG every year. Liquefied natural gas (LNG) is a low-temperature liquid at -162°C, which is obtained by freezing and liquefying natural gas through deacidification and dehydration. The production of 1 ton of LNG requires about 850kWh of electricity, and a large amount of cold energy will be released when it is vaporized at the receiving station, about 830-860kJ / kg. If this part of the cold capacity i...

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Problems solved by technology

[0008] The above-mentioned patented technologies directly use LNG to exchange heat directly with cooling devices. Since LNG receiving stations are generally located near ports, land resources are usually limited and land use is expensive. It is difficult to arrange large-scale cooling utilization projects in In the receiving station; and the LNG cooling capacity of the receiving station is huge, the cooling demand of a single project is relatively small, and the receiving station cannot accommodate multiple cooling utilization projects, resulting in insufficient recycling of the LNG cooling capacity

If LNG is transported to cooling users outside the receiving station through insulated pipelines, since the LNG vaporization process is not under the direct control of the receiving station, it is impossible to provide safe gas supply according to the gas demand fluctuations of downstream users of natural gas

Due to the limitation of the site and the inability to transport all the LNG to the receiving station for vaporization, the existing LNG cooling capacity utilization projects are relatively single, and the scale is limited, and the utilization rate of LNG cooling capacity is not high

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