RU34990U1 - Gas distribution station with a power plant - Google Patents

Description

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Gas distribution station with a power plant

The proposed utility model relates to an expander-generator units designed to generate electricity using excess pressure of natural gas transported in pipelines, and can be used at gas distribution stations and gas control points.

Known (RF Patent No. 2150641, publ. 06/15/1999) a thermal power plant containing an expander-generator unit, part of the electric power of which is transmitted to the compressor of the heat pump used to heat the high pressure gas in front of the expander due to low-potential heat of the environment.

A disadvantage of such an installation is that part of the electric power of the turboexpander is sent to the compressor drive of the heat pump installation.

Known (RF Patent No. 2009389, publ. March 15, 1994) a gas distribution station with a power plant, containing a main gas pipeline with a reducing device, a gas turbine engine with a heat exchanger at the outlet for heating the gas selected before the reducing device from the main gas pipeline, a turboexpander with an electric generator, when the turbo expander input is connected to the heat exchanger output, the heat exchanger is a regenerator for preheating the selected gas, installed in front of the gas turbine heat exchanger engine and connected via a heating medium with its input and output, respectively, to the output of the turboexpander and the gas pipe after the reducing device, and through the heated medium by the input

-to the main gas pipeline in front of the reducing device and exit

-to the inlet of the gas turbine engine heat exchanger.

The disadvantage of this installation is its low profitability, since for the operation of this installation it is required to burn a large amount of fuel gas.

The technical problem solved by the utility model is to increase efficiency by reducing the use of gas as fuel by attracting the heat of secondary energy resources.

The stated technical problem is solved by the fact that the well-known gas distribution station with a power plant, consisting of a main pipeline with a reducing device, a gas turbine engine with a heat exchanger, a turbine expander with an electric generator, an inlet of the turbine expander is connected to the outlet of the heat exchanger, according to a utility model, is equipped with an additional heat exchanger installed on the main pipeline in front of the gas turbine engine heat exchanger, to the heating side of the additional heat exchanger connected in series and connected throttling device, an evaporator and a compressor, the output of which is connected to the input of an additional heat exchanger, wherein the compressor is located on the same shaft as the turbine engine.

A schematic diagram of the proposed device is presented in the figure.

The installation comprises a main pipeline 1 installed along the gas and connected in series with an additional heat exchanger 2 and a heat exchanger 3, a turboexpander 9 kinematically connected to an electric generator 10. The inlet of the gas turbine engine 7 is connected to the main pipeline 1, and the outlet to the heat exchanger 3. The compressor 6 is located on one a shaft with a gas turbine engine 7 and is driven by it. The compressor input 6 is connected to the output of the evaporator 11, the input

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which through the throttling device 5 is connected to the output of the additional heat exchanger 2, forming a heat pump. On the main pipeline 1 there is a throttle 4, the input of which is connected to the input of the turbo expander 9, and the output to the output of the turbo expander.

The scheme works as follows. Part of the high-pressure gas enters through an additional pipeline 1 to an additional heat exchanger 2, the heating medium in which is the low-boiling liquid of the heat pump, which is sent to the additional heat exchanger by the compressor 6. The low-boiling liquid, having given up heat in the additional heat exchanger 2, expands in the throttle device 5, after which it enters to the evaporator 11, where it is heated by low-potential heat of the environment and is supplied to the inlet pipe of the compressor 6. Heated in an additional heat exchanger 2 high pressure gas, then heated in the heat exchanger 3 and enters the turbo expander 9. After mechanical work and expansion in the turbo expander 9, the gas enters the low pressure pipeline, and the mechanical work of the gas obtained in the turbo expander 9 is converted into electrical energy in the electric generator 10, which is transmitted to the external electrical network 12,

Another part of the high-pressure gas expands in the gas turbine engine 7, located on the same shaft with the compressor 6 and driving it. The exhaust gases after the gas turbine engine 7 are sent to the heat exchanger 3, where it heats the high pressure gas and then goes to the chimney 8.

Thus, the high efficiency of the proposed installation lies in the fact that it is not necessary to expend the energy generated by the expander to drive the compressor of the heat pump and it is useful to use the heat of the exhaust gases of a gas turbine engine.

Claims (1)

A gas distribution station with a power plant, containing a series-connected main pipeline with a reducing device, a gas turbine engine with a heat exchanger, a turboexpander with an electric generator, an inlet of the turbo expander connected to the output of the heat exchanger, characterized in that it is equipped with an additional heat exchanger installed on the main pipeline in front of the heat exchanger of the gas turbine engine, to side of an additional heat exchanger connected in series connected s throttling device, an evaporator and a compressor, the output of which is connected to the input of an additional heat exchanger, wherein the compressor is located on the same shaft as the turbine engine.