Method and device for pipe network pressure energy using turbo expander

Abstract

The invention discloses a pipe network pressure energy method and device utilizing a turbo-expander. The device comprises a pressure adjusting system, a power generation system and an intelligent control system. The pressure adjusting system comprises the turbo-expander, a temperature and pressure balancer connected with a gas outlet of the expander, and a recuperator connected with the temperature and pressure balancer, and the turbo-expander and a high pressure pipe network perform gas inflow through a pipeline; and a gas outlet of the recuperator is connected with a low pressure pipe network. The power generation system comprises a gearbox connected with the expander, and a power generator connected with the gearbox; and the power generator is connected with a downstream user power source. The intelligent control system comprises a PLC, a first pressure transmitter, a second pressure transmitter, a first temperature transmitter, a second temperature transmitter, a speed transmitter and the expander. By means of the pipe network pressure energy method and device utilizing the turbo-expander, the beneficial effects that the connected and optimal turbo-expander is high in mechanical efficiency, flexible, convenient and fast to install and wide in application range are fully utilized, the breakage, caused by the sudden change of the flow, of a transmission shaft can be avoided to a certain extent, an oil and water separator is not needed, cost is saved, and the method and device are safe and reliable, and convenient to use and popularize.

Description

technical field [0001] The invention relates to the field of recovery and utilization of natural gas pipeline network pressure energy, in particular to a pipeline network pressure energy process and device using a turbo expander. Background technique [0002] After natural gas is sent to end users through long-distance pipelines in a high-pressure manner, it usually requires pressure regulating equipment to regulate the pressure so as to match the gas facilities. The reality at home and abroad is that the huge pressure energy contained in natural gas during the pressure regulation process is not only wasted in vain, but also poses a threat to the pressure regulation and pipeline equipment operation safety due to the sharp drop in temperature. The pressure energy recovery of natural gas not only solves the problem of difficult electricity consumption in the pressure regulating station, but also makes use of the pressure energy contained in it to improve the economy of the gas...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN103422899 has designed a set of small-scale natural gas pipeline network pressure energy generation process and device for remote areas. This process uses expansion work to drive generators to generate electricity, but the mechanical efficiency of the expander used is low and the power generation is small.

But the actual effect is not obvious, and it has not played a substantial role in solving the problem of fracture of the drive shaft caused by high-speed operation during the expansion process.

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