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Process and device utilizing pressure of natural gas to partially liquefy natural gas

A technology for liquefied natural gas and natural gas, which is applied in the directions of liquefaction, refrigeration and liquefaction, chemical instruments and methods, and can solve problems such as poor adaptability and affecting the refrigeration efficiency of expanders.

Active Publication Date: 2012-09-12
XINDI ENERGY ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adaptability of the expander to variable working conditions is poor. When the inlet gas flow rate changes greatly, it will significantly affect the cooling efficiency of the expander.

Method used

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  • Process and device utilizing pressure of natural gas to partially liquefy natural gas
  • Process and device utilizing pressure of natural gas to partially liquefy natural gas
  • Process and device utilizing pressure of natural gas to partially liquefy natural gas

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Embodiment Construction

[0053] The principle of the invention is to make full use of the pressure energy of the high-pressure natural gas itself during the pressure regulation process of the natural gas pressure regulating station, use the high and low temperature expander expansion refrigeration process to liquefy a part of the natural gas in the pipeline network into liquefied natural gas, and configure the circulating gas circuit , Improve the variable load adaptability of the device.

[0054] Such as figure 1 As shown, the device for partial liquefaction of natural gas utilizing the pressure of natural gas according to the present invention includes a dehydration and deheavy hydrocarbon system 1, a decarburization system 2, a liquefaction system 3 and a cycle gas compression system 4 connected to each other through pipelines, and the liquefaction The system 3 includes a main heat exchanger 31 for heat exchange, a throttle valve 32, a gas-liquid separator 33, a high-temperature expander 34, a low...

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Abstract

The invention provides a process and a device utilizing pressure of natural gas to partially liquefy the natural gas. The principle of the process and the device is that pressure energy of high-pressure natural gas generated during pressure regulation of a natural gas pressure regulation station is fully utilized, obtained cold quantity is used for liquefying part of the natural gas in pipe networks through the expansion refrigeration technology, and the value of the natural gas is greatly improved. By arranging a recycle gas circuit, the shortcoming of poor adaptability of variable working conditions of the expansion refrigeration technology is overcome, and variable load adaptability of the device is remarkably improved. In addition, when the device works with normal load, work energy consumption of a unit product approximates zero, and energy required by liquefaction completely comes from the pressure energy between a high-pressure pipe network and a low-pressure pipe network.

Description

technical field [0001] The present invention relates to a process and device for partially liquefying natural gas by utilizing the pressure energy of natural gas. Utilizing the pressure energy of the high-pressure natural gas itself in the pressure regulating process of the natural gas pressure regulating station, a part of the natural gas in the pipeline network is liquefied into liquefied natural gas by using an expansion refrigeration process. And the device has good variable load adaptability. Background technique [0002] Pipeline natural gas is generally transported to the urban medium-pressure pipeline network at high pressure through long-distance pipelines. Before being supplied to end users, it usually needs to be depressurized by pressure regulating equipment so that the pressure of natural gas can match the gas facilities. High-pressure natural gas contains huge pressure energy, and this part of pressure energy is often wasted in vain during the process of pressu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10B01D53/047F25J1/02F25J3/08
CPCF25J1/0022F25J1/0037F25J1/004F25J1/0201F25J1/0202F25J1/0232F25J1/0288F25J2205/66F25J2210/06F25J2270/06Y02C20/40
Inventor 何振勇蔚龙刘丽梅
Owner XINDI ENERGY ENG TECH
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