A system for comprehensive utilization of pressure energy in a natural gas pressure regulating station

Abstract

The invention relates to a system for comprehensive utilization of pressure energy of a natural gas pressure regulating station, which integrates expansion power generation and natural gas liquefaction with the original pressure regulating station, including a pretreatment device, a preheating device, a traditional pressure regulating device, a two-stage expander, Refrigerant heat exchange device, three-stage multi-stream heat exchanger, refrigerant cycle device and liquefied natural gas storage tank, etc. The two-stage expander is used to convert the pressure energy of high-pressure natural gas into mechanical energy to drive the generator to generate electricity, which can be used for power consumption in the pressure regulating station or natural gas liquefaction process. After expansion, the low-temperature natural gas is exchanged with a cold medium to recover cold energy for the temperature drop of the refrigerant, and the natural gas is heated up to the standard gas supply temperature of the downstream pipeline network, and flows into the downstream pipeline network; or enters the natural gas liquefaction process as a raw material, directly Utilize the cold energy of expanded natural gas. The invention has the advantages of energy saving and emission reduction, strong adaptability to gas source load changes, high energy utilization rate, strong scene adaptability, etc., and can be widely used in pipeline network natural gas pressure regulating stations.

Description

technical field [0001] The invention relates to a comprehensive utilization system of pressure energy of a natural gas pressure regulating station, which belongs to the technical field of pressure energy recovery of natural gas pipeline networks. Background technique [0002] The large-scale expansion of the natural gas network and the development and construction of the high-pressure pipeline network tend to be long-distance and large-diameter, so that the energy recovery and comprehensive utilization of natural gas pressure regulating stations have sufficient development opportunities and prospects. Multi-stage pressure regulating stations on long-distance natural gas high-pressure pipelines have a large amount of recoverable natural gas pressure energy during the pressure regulation process; while traditional pressure regulation methods mostly use pressure regulating valve groups to throttle and reduce high-pressure natural gas, high-quality pressure energy cannot be obtai...

AI Technical Summary

Problems solved by technology

However, electric energy is easy to transmit and can be used by the voltage regulating station or incorporated into the grid; cold energy is not easy to absorb and is not suitable for long-distance transportation, and there are certain obstacles in recycling technology and market supply and demand

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