LNG long distance transportation device and transportation method thereof
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A long-distance transportation and long-distance transportation technology, which is applied to the method of container discharge, pressure vessels, equipment discharged from pressure vessels, etc., can solve problems such as LNG gasification, gas slug flow, and increased resistance along the way
Active Publication Date: 2019-11-19
CHINA PETROLEUM & CHEM CORP +1
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[0005] The purpose of the present invention is to provide a long-distance LNG transportation device and its transportation method, to solve the problem that in the prior art, LNG is saturated liquid natural gas when it enters the pipeline, and the temperature rise along the long-distance pipeline will easily cause part of the LNG to gasify. Two-phase flow is formed in the pipeline. The two-phase flow not only greatly increases the resistance along the way, but also may generate gas slug flow, which seriously affects the transportation and safe operation of the pipeline.
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Embodiment 1
[0026] Such as figure 1 and figure 2 As shown in the figure, the LNG (liquefied natural gas) long-distance transportation device is schematically shown to include an LNG liquid storage tank 1, a high-pressure pump 2, a gasifier 3, a multi-pipeline long-distance transmission casing 4, a gas-liquid separator 5 and Cold pump station6.
[0027]In the embodiment of the present application, the LNG liquid storage tank 1 is used to store LNG, and a submersible pump 11 capable of pressurizing the LNG into low-pressure LNG is provided inside the LNG liquid storage tank 1 . Wherein, the LNG liquid storage tank 1 is used to receive liquefied natural gas transported by ships or LNG tankers.
[0028] The high-pressure pump 2 communicates with the LNG storage tank 1 through a first pipeline, and is used to pressurize the low-pressure LNG into high-pressure LNG.
[0029] The first inlet of the gasifier 3 communicates with the first outlet of the high pressure pump 2 .
[0030] Multi-pip...
Embodiment 2
[0047] This embodiment is basically the same as Embodiment 1. For the sake of brevity, in the description process of this embodiment, the same technical features as Embodiment 1 will not be described, and only the differences between this embodiment and Embodiment 1 will be described:
[0048] Such as image 3 As shown, according to the second aspect of the present application, a method for LNG long-distance transportation is also provided, including:
[0049] Step S1, pressurizing the liquefied natural gas into high-pressure liquefied natural gas. Specifically, the low-temperature liquefied natural gas is first pressurized into low-pressure liquefied natural gas by the submersible pump 2 , and then the low-pressure liquefied natural gas is pressurized by the high-pressure pump 2 to high-pressure liquefied natural gas for export.
[0050] Step S2, dividing the first part of the high-pressure LNG into n streams, and throttling the n-1 LNG streams respectively to obtain LNG exp...
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Abstract
The invention relates to the technical field of LNG long distance transportation processes and discloses a LNG long distance transportation device and a transportation method thereof. The LNG long distance transportation device comprises an LNG liquid storage tank, a high pressure pump, a gasifier, a multi-pipeline long distance transportation sleeve, a gas-liquid separator and a cold pump station, wherein an immersed pump is arranged in the LNG liquid storage tank; the high pressure pump communicates to the LNG liquid storage tank through a first pipeline; a first inlet of the gasifier communicates to a first outlet of the high pressure pump; a first inlet of the multi-pipeline long distance transportation sleeve communicates to a first outlet of the gasifier through a second pipeline, asecond outlet of the multi-pipeline long distance transportation sleeve communicates to the cold pump station, a second inlet of the multi-pipeline long distance transportation sleeve communicates toa second outlet of the high pressure pump, a second out of the multi-pipeline long distance transportation sleeve communicates to an inlet of the gas-liquid separator, and the inlet of the gas-liquidseparator communicates to the cold pump station. The LNG long distance transportation device has the advantages of being high in transportation efficiency and improving the utilization ratio of cold energy of liquefied natural gas.
Description
technical field [0001] The invention relates to the technical field of LNG long-distance transportation technology, in particular to an LNG long-distance transportation device and a transportation method thereof. Background technique [0002] A large amount of LNG (liquefied natural gas) transportation adopts liquid transportation to be more economical than gas transportation, and the transportation volume can be increased by 3.5 to 3.7 times, and the investment can be saved by 2 to 4 times. When LNG enters the pipeline, it is saturated liquid natural gas. The temperature rise of the pipeline can easily cause part of the LNG to gasify, forming a two-phase flow in the pipeline. The two-phase flow not only greatly increases the resistance along the way, but also may cause gas slug flow, which seriously affects the transportation and safe operation of the pipeline. . [0003] Therefore, for cryogenic liquid transportation pipelines, especially long-distance pipelines, special ...
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Application Information
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