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A process and device for preventing water hammer in LNG pipelines

A process method and water hammer technology, applied in the pipeline system, mechanical equipment, gas/liquid distribution and storage, etc., can solve the problems of inapplicability, and achieve the effects of easy processing, reasonable design and convenient use

Active Publication Date: 2018-08-24
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for ultra-low temperature LNG pipelines, this method is obviously not applicable

Method used

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  • A process and device for preventing water hammer in LNG pipelines

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Configuration device:

[0021] The device for preventing water hammer in LNG pipelines includes an LNG pump 1 and a buffer tank 6, a check valve 4 is installed in the middle of the outlet pipeline 9 of the LNG pump 1, and the outlet pipeline 9 on the upstream side of the check valve 4 is Injector 1 2 is arranged inside, and injector 2 3 is arranged in the outlet pipeline 9 of the downstream part on the other side of check valve 4; the nozzle direction of injector 1 2 and injector 2 3 is in line with the normal liquid outlet direction of LNG pump 1 same.

[0022] The outlet pipes at the bottom of the buffer tank 6 communicate with the first injector 2 and the second injector 3 respectively, and the top of the buffer tank 6 communicates with the cold preservation circulation pipeline 8 on which a flow-restricting orifice 12 is arranged. The inside of the buffer tank 6 is radially equipped with a separation plate 5, and the inner cavity of the buffer tank 6 at the top of ...

Embodiment 2

[0025] Configuration device:

[0026] The device for preventing water hammer in LNG pipelines includes an LNG pump 1 and a buffer tank 6, a check valve 4 is installed in the middle of the outlet pipeline 9 of the LNG pump 1, and the outlet pipeline 9 on the upstream side of the check valve 4 is Injector 1 2 is arranged inside, and injector 2 3 is arranged in the outlet pipeline 9 of the downstream part on the other side of check valve 4; the nozzle direction of injector 1 2 and injector 2 3 is in line with the normal liquid outlet direction of LNG pump 1 same.

[0027] The outlet pipes at the bottom of the buffer tank 6 communicate with the first injector 2 and the second injector 3 respectively, and the top of the buffer tank 6 communicates with the cold preservation circulation pipeline 8 on which a flow-restricting orifice 12 is arranged. The inside of the buffer tank 6 is radially equipped with a separation plate 5, and the inner cavity of the buffer tank 6 at the top of ...

Embodiment 3

[0030] Configuration device:

[0031] The device for preventing water hammer in the LNG pipeline includes an LNG pump 1 and a buffer tank 6, a check valve 4 is installed in the middle of the outlet pipeline 9 of the LNG pump 1, and the outlet pipeline 9 on the upstream side of the check valve 4 is Injector 1 2 is arranged inside, and injector 2 3 is arranged in the outlet pipeline 9 of the downstream part on the other side of check valve 4; the nozzle direction of injector 1 2 and injector 2 3 is in line with the normal liquid outlet direction of LNG pump 1 same.

[0032] The outlet pipes at the bottom of the buffer tank 6 communicate with the first injector 2 and the second injector 3 respectively, and the top of the buffer tank 6 communicates with the cold preservation circulation pipeline 8 on which a flow-restricting orifice 12 is arranged. The inside of the buffer tank 6 is radially equipped with an isolation plate 5, and the inner cavity of the buffer tank 6 at the top ...

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Abstract

The invention discloses a process method and device for preventing water attack of an LNG pipeline. The device comprises an LNG pump and a buffer tank. A check valve is mounted on the middle portion of an outlet pipeline of the LNG pump, an ejector I is arranged in the outlet pipeline on the upstream portion of one side of the check valve, and an ejector II is arranged in the outlet pipeline on the downstream portion of the other side of the check valve; an outlet pipeline in the bottom of the buffer tank separately communicates with the ejector I and the ejector II, and the top of the buffer tank communicates with a cold insulating circulating pipeline. Compared with the prior art, the device for preventing water attack of the LNG pipeline disclosed by the invention has the characteristics of being reasonable in design, easy to process, convenient to use, safe and reliable and the like, effectively reduces the water attach effect of the LNG pipeline, and fundamentally solves the water attach problem of the LNG pipeline.

Description

technical field [0001] The invention relates to the technical field of using liquefied natural gas, in particular to a process and device for preventing water hammer in LNG pipelines. Background technique [0002] LNG (Liquefied Natural Gas) is the abbreviation of liquefied natural gas. Due to its clean energy, it is currently being vigorously developed, and the construction of LNG receiving stations is in full swing in China. According to the national energy plan, the proportion of natural gas in energy consumption is increasing year by year, and it is expected to account for about 10% of the entire energy structure by 2020. [0003] With the vigorous development of LNG, constructions such as LNG receiving stations have sprung up. In the LNG station, it is very important as a low-temperature LNG pipeline, which is used to transport LNG and connect upstream and downstream processes. In the process of designing LNG pipelines, calculation and analysis of water hammer is very...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D1/14F17D3/01F17D5/00
CPCF17D1/082F17D1/14F17D3/01F17D5/00
Inventor 仇德朋徐国峰鹿晓斌贺同强郭雷曲顺利张华伟
Owner CHINA NAT OFFSHORE OIL CORP
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