A utilization system for recovery of pressure energy and cold energy of pipeline network natural gas

Abstract

The invention relates to an efficient pipe network natural gas pressure energy and cold energy recycling and utilization system. The system is used for recycling natural gas pressure energy in a high-pressure natural gas pipe to be used for generating electricity and recycling natural gas cold energy in a pipe network to be used for making ice. The system comprises a pressure energy recycling device and a cold energy recycling device. The pressure energy recycling device is connected with the cold energy recycling device and the high-pressure natural gas pipe. The cold energy recycling device is connected with a downstream natural gas pipe and the municipal water pipe network. A pressure stabilizing valve is arranged between the high-pressure natural gas pipe and the pressure energy recycling device. Compared with the prior art, the efficient pipe network natural gas pressure energy and cold energy recycling and utilization system has the advantages of being high in energy utilization rate, safe, reliable, capable of achieving multi-temperature-return protection, efficient, capable of saving energy, clear in structure, convenient to remold and the like.

Description

technical field [0001] The invention relates to the field of recovery and utilization of pressure energy and cold energy in the natural gas pressure regulation process, in particular to a utilization system for recovering pressure energy and cold energy of natural gas in a pipeline network. Background technique [0002] Natural gas is a clean energy. With the adjustment of the national energy structure, the proportion of natural gas consumption is increasing. By 2020, the proportion of natural gas in primary energy consumption will increase to more than 10%, and my country's natural gas pipeline will be developed rapidly. [0003] Long-distance natural gas pipelines generally use high-pressure transmission, that is, during the transportation process, natural gas needs to be raised to high-pressure transmission through the compressor station, and needs to be depressurized at the user side. At present, the pipeline pressure of Line I of the "West-to-East Gas Pipeline" that has...

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Problems solved by technology

It also uses the pressure energy of the high-pressure natural gas pipeline. The cold energy generated here is warmed up with the waste heat of the gas unit, and the cold energy of the expanded natural gas has not been effectively utilized.

In addition, this invention is only suitable for the field of gas turbine work, and the applicable occasions are limited

[0009] Bihaizhou (Beijing) Petrochemical Equipment Co., Ltd. Lou Shisong, Di Jianjun, Shen Yitong, Hu Chuanfen, etc. invented a power generation and pressure regulating device suitable for high-pressure natural gas pipelines. The patent number is CN203962047U. The drive cable needs to be installed for the drive, which leads to the technical defect of requiring a voltage regulating station to build a power station, and the consumption of natural gas in the process of heating low-temperature natural gas with a heating furnace, resulting in a technical defect of high energy consumption

However, this patent still does not fundamentally utilize the cold energy of the natural gas after depressurization, but uses the electric energy generated by the pressure energy of the natural gas to drive the air cooler to reheat the low-temperature natural gas, which consumes the electric energy generated by the system

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