Natural gas differential pressure energy recovery unit device

Abstract

The invention provides a natural gas differential pressure energy recovery unit device which is arranged between a natural gas inlet pipeline and a natural gas low pressure equipment pipeline.The device comprises a turbo expander, a gas inlet pipeline of the turbo expander is connected with the natural gas inlet pipeline, an exhaust pipeline of the turbo expander is connected with the equipment pipeline in need of natural gas, the turbo expander is further connected with a clutch, an output shaft of a motor is coaxially connected with a compressor, and the other end of the motor is coaxially connected with the turbo expander through the clutch.Compared with the prior art, the turbo expander of the natural gas differential pressure energy recovery unit device and a pressure regulator subcircuit are arranged in parallel, when the turbo expander breaks down and the clutch separates quickly, a gas circuit can be switched to the pressure regulator subcircuit rapidly, and normal operation of a system is not influenced.Through arrangement of the turbo expander, a pressure regulator can be effectively replaced to achieve the function of lowering the pressure, meanwhile, action is conducted outward, the compressor is driven to run, self-consumed electricity is effectively reduced, and full utilization of energy is achieved.

Description

technical field [0001] The invention belongs to the technical field of gas transmission and power generation, and in particular relates to a natural gas differential pressure energy recovery unit device. Background technique [0002] With the gradual completion of the West-East Gas Pipeline and the introduction of overseas liquefied natural gas, as well as the national requirements for energy conservation and emission reduction, natural gas, as a clean energy, is gradually replacing coal and becoming the main fuel for power plants. The natural gas in gas-fired power plants usually comes from pipelines, city gate stations or LNG gasification. The gas source pressure is relatively high, and the gas inlet pressure required by gas turbines, gas boilers and other power plants is relatively low. Usually, the pressure is adjusted through a pressure regulator. , in the process of pressure regulation, there will be a large loss of heat and energy. Moreover, there is more than one na...

AI Technical Summary

Problems solved by technology

The natural gas in gas-fired power plants usually comes from pipelines, city gate stations or LNG gasification. The gas source pressure is relatively high, and the gas inlet pressure required by gas turbines, gas boilers and other power plants is relatively low. Usually, the pressure is adjusted through a pressure regulator. , in the process of pressure regulation, there will be a large loss of heat and energy

Moreover, there is more than one natural gas branch in the power plant or gate station system. Since the pressure required by each terminal equipment is different, some need to be depressurized, and some need to be pressurized. Motor drive, considering the energy consumption of energy transmission, this is a great waste of energy

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