Method and device for efficient utilization of pressure energy of natural gas pipeline network

Abstract

The invention discloses a method and a device for efficient utilization of pressure energy of a natural gas pipeline network. The method of the invention comprises natural gas pressure energy refrigeration and cold energy utilization. The method comprises the following steps of: exchanging heat between a normal-temperature liquid refrigerant from a third refrigerant storage tank and a low-temperature gaseous refrigerant from a refrigeration storage, reducing the temperature to between 17 and 22 DEG C, reducing the pressure to 0.1MPa through a pressure regulating valve, and delivering the liquid refrigerant into the refrigeration storage at the temperature of 32 DEG C below zero; meanwhile, reducing the pressure of a refrigerant of a second refrigerant storage tank to 0.1MPa through the pressure regulating valve, and delivering the refrigerant into the refrigeration storage at the temperature of 32 DEG C below zero; raising the temperature of the low-temperature gaseous refrigerant after exchanging the heat with the normal-temperature liquid refrigerant to 0 DEG C, then exchanging heat between the low-temperature gaseous refrigerant and circulating water to reduce the temperature of the circulating water and raise the temperature of the low-temperature gaseous refrigerant to between 10 and 15 DEG C, and returning the low-temperature gaseous refrigerant to a first refrigerant storage tank for recycle and later use. The method and the device can remarkably improve the utilization rate of the pressure energy of the pipeline network, and have great economic benefit and broad development space.

Description

technical field [0001] The invention relates to the technical field of pressure energy expansion refrigeration and compressed refrigerant expansion refrigeration, in particular to an integrated utilization method and device for pressure energy refrigeration of a natural gas pipeline network, compressed refrigerant expansion refrigeration, and cold water air-conditioning refrigeration technology. Background technique [0002] The energy crisis is getting worse day by day, making the basic national policy of energy conservation and emission reduction deeply rooted in the hearts of the people. Recycling and utilizing the pressure energy of the natural gas pipeline network and using it in the refrigeration industry meets the national requirements for energy conservation and emission reduction, but up to now, the utilization efficiency of the pressure energy of the natural gas pipeline network is not high. With the completion of my country's West-to-East Gas Transmission, Sichuan...

AI Technical Summary

Problems solved by technology

Chinese patent CN101245956A discloses a method of using the pressure energy of the pipe network for cooling users such as cold storage and cold water air conditioners, which realizes the cascade utilization of cold energy. However, this invention only uses the cooling capacity obtained by expanding the pressure energy. The work done by the expander is not utilized

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