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LNG (liquefied natural gas) pipeline precooling method and NG (natural gas) cool air generating device

A technology for generating device and air-conditioning, which is applied in the direction of combination device, separation method, chemical instrument and method, etc., to achieve the effect of small equipment footprint, reduced banana effect and simple structure

Pending Publication Date: 2019-09-20
ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dew point of nitrogen after air separation is around -69°C, so liquid nitrogen is not suitable as a working medium in the second half of LNG pre-cooling operation

Method used

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  • LNG (liquefied natural gas) pipeline precooling method and NG (natural gas) cool air generating device
  • LNG (liquefied natural gas) pipeline precooling method and NG (natural gas) cool air generating device
  • LNG (liquefied natural gas) pipeline precooling method and NG (natural gas) cool air generating device

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Embodiment Construction

[0028] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0029] The method for precooling an LNG pipeline according to the present invention uses the sensible heat of NG at normal temperature to vaporize the LNG to form NG cold air, and uses the NG cold air to precool the LNG pipeline.

[0030] Such as Figure 4 As shown, a kind of LNG pipeline precooling method described in the present invention is specifically: the LNG from the LNG discharge tank 1 is fully mixed with normal temperature NG in the LNG mixing device 2 to produce low-temperature NG atomized gas and low-temperature NG mist The gas is separated by the LNG gas-liquid separator 3 to obtain dry NG cold air, which is used as the pre-cooling circulating gas before the LNG pipeline and equipment start; the liquid separated by the LNG gas-liquid separator 3 is returned to the LNG discharge tank 1.

[0031] Such as figure 1 As shown, a kind of ...

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Abstract

The invention relates to an LNG (liquefied natural gas) pipeline precooling method and an NG (natural gas) cool air generating device. The NG cool air generating device comprises an LNG vent tank, an LNG mixing device and an LNG gas-liquid separator, an LNG outlet of the LNG vent tank is connected with an LNG inlet of the LNG mixing device, an NG inlet of the LNG mixing device is connected with a normal-temperature natural gas pipeline of an LNG plant station, an atomized NG outlet of the LNG mixing device is connected with an atomized NG inlet of the LNG gas-liquid separator, a condensate outlet of the LNG gas-liquid separator is connected with a reflux inlet of the LNG vent tank, and an NG cool air outlet of the LNG gas-liquid separator is connected with an NG cool air outlet pipe. The LNG pipeline precooling method has the advantages that sensible heat of NG is adopted to gasify LNG, and generated NG cool air is used for precooling an LNG pipeline system. The NG cool air generating device has the advantages of simple structure, low cost, safety and reliability.

Description

technical field [0001] The invention relates to the technical field of LNG pipeline precooling, in particular to an LNG pipeline precooling method and an NG cold gas generating device. Background technique [0002] The process of cooling the LNG piping system from ambient temperature to operating temperature is called pre-cooling. In the pre-cooling process, in order to cool the pipeline, insulation layer and surrounding soil, a certain amount of low-temperature working medium needs to be evaporated, and it takes a long time to reach a thermally stable state. The design and calculation of the pre-cooling process is to determine the consumption of low-temperature medium and the pre-cooling time. The pre-cooling process of the LNG pipeline system is a complex heat transfer process. During the pre-cooling process, the LNG pipeline system can not only use the latent heat of vaporization of the low-temperature working medium, but also use the sensible heat absorbed by the evapor...

Claims

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Application Information

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IPC IPC(8): C10L3/12B01D50/00
CPCC10L3/12B01D50/00
Inventor 王洪博陈瑜
Owner ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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