Comprehensive utilization device and method for pipeline natural gas pressure energy cold energy

Abstract

The invention relates to a comprehensive utilization device and method for pipeline natural gas pressure energy cold energy. The device comprises a first cold energy recycling system, a second cold energy recycling system, an expanding system, a liquefying system, a pre-treatment device and a power generating system; a refrigerant inlet / outlet of the first cold energy recycling system is connectedwith a high-pressure pipe network and the input end of the expanding system correspondingly, and a hot medium inlet / outlet is connected with a refrigerating agent outlet of the liquefying system anda first hot medium inlet of the second cold energy recycling system correspondingly; a first hot medium outlet of the second cold energy recycling system is connected with a refrigerating agent inletof the liquefying system, and a second hot medium inlet / outlet is connected with the input end of the pre-treatment device and the input end of the liquefying system correspondingly; a refrigerant inlet / outlet is connected with the output end of the expanding system and a low-pressure pipe network correspondingly; the power output end of the expanding system is connected with the power generatingsystem; the input end of the pre-treatment device is connected with the high-pressure pipe network; and the LNG output end of the liquefying system is connected with a downstream user. The comprehensive utilization device and method for the pipeline natural gas pressure energy cold energy can be widely applied in the natural gas energy utilizing field.

Description

technical field [0001] The invention relates to the field of natural gas compression and refrigeration technology, in particular to a device and method for comprehensive utilization of pipeline natural gas pressure energy and cold energy. Background technique [0002] Pipeline natural gas maintains a relatively high pressure during the transportation process, and needs to be depressurized through a pressure regulating station during the transportation to downstream users. During the decompression process of the pressure regulating station, huge pressure energy and cold energy are generated. At the same time, the temperature of the natural gas in the pipeline after decompression is low (less than 0°C). In order to prevent the moisture in the natural gas from freezing and blocking the pipeline, the natural gas needs to Supplementary heating is carried out to ensure that the temperature of natural gas entering the downstream low-pressure pipeline after pressure regulation at th...

AI Technical Summary

Problems solved by technology

In order to alleviate the pressure of environmental pollution and provide more clean energy for the society, some literatures have proposed to use pipeline pressure to produce liquefied natural gas. Patent No. CN202595072U proposes to use pipeline natural gas pressure to liquefy natural gas. The performance is not good enough. Patent No. CN203758165U has designed a device for generating electricity and producing liquefied natural gas using pipeline natural gas pressure energy, but the device does not carry out comprehensive utilization of heat energy and cold energy

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