RU2460891C1 - Combined gas turbine compressor unit - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: proposed unit comprises main line compressor, gas turbine engine made up of compressor unit, combustion chamber and turbine unit, engine hear recovery system communicated with external turbine. Heat recovery system is composed by expanded section of engine exhaust circuit and main line compressor pressure pipe length fitted through engine cavity. Said main line compressor pressure pipe length features developed heat exchange surface. External turbine drives gar turbine engine compressor unit.

EFFECT: higher efficiency, reduced costs.

1 dwg

Description

The present invention relates to gas transmission equipment and can be used to create gas turbine gas pumping units (GGPA).

Known combined GGPA, made according to the scheme of a binary gas-steam cycle with utilization of the heat of the exhaust gases of a gas turbine installation at compressor stations of main gas pipelines (B. S. Revzin. Gas-turbine gas-pumping units. - M .: Nedra, 1986, p. 178, Fig. 79 )

Modern combined gas-turbine gas turbine engines operating according to the binary gas-steam cycle scheme are a combination of two independent power plants (gas gas turbine and steam power plants), interconnected only by a line of combustion products processed in the turbine block of a gas turbine engine (GTE). At the same time, the steam power plant has a closed circuit along which a specially prepared coolant moves.

The gas turbine part of the combined gas turbine engine includes a main compressor driven by a gas turbine engine consisting of a compressor unit, a combustion chamber, and a turbine unit. The principle of operation of a gas turbine engine is as follows: the compressor unit delivers air to the combustion chamber. In the combustion chamber, air is mixed with fuel and the resulting air-fuel mixture is burned. Further, the combustion products are fed to the turbine engine block, which converts the energy of the combustion products into useful work used to drive the compressor unit and drive the main compressor (useful work), with up to 60% of the power of the turbine unit being spent on driving the compressor unit. Then, the gases processed by the turbine unit of the gas turbine engine are sent to the steam turbine part.

In the steam-turbine part, the remaining thermal energy of the GTE combustion products is utilized in a steam recovery boiler, the generated steam is sent to the entrance to the steam turbine, where the steam pressure with the help of the steam turbine does useful work by rotating the shaft. The steam generated in the recovery boiler is the working fluid for the steam turbine. Next, the waste steam enters the condenser, where the steam condenses, the water is pumped by condenser pumps to the water treatment plant, from it the water is fed by feed pumps to the steam recovery boiler and so on in a circle. The shaft of a steam turbine is connected either to a compressor for pumping transported gas, or to a generator for generating electricity. In the presence of an autonomous blower and an additional fuel supply line to the waste heat boiler, a break in the exhaust gas line transfers both units to an operation mode independent from each other with a lower overall thermal efficiency.

The disadvantages of the aforementioned combined HHPA, performed according to the binary gas-steam cycle scheme, are the presence of two useful power take-off shafts (one from the gas turbine engine, the second from the steam power plant), which necessitate the presence of two consumers (two main compressors or a main compressor and generator), high optimum degrees air compression in the compressor unit at very high mass air flow rates through the gas turbine engine, the need for a large number of systems for the preparation and processing of intermediate o coolant (steam): condensers, pumps, water treatment systems, which ultimately reduces economic performance.

An object of the invention is to eliminate these drawbacks and increase the economic efficiency of the manufacture and operation of combined GGPA.

The technical result is achieved in that in a combined gas turbine engine containing a main compressor, a gas turbine engine consisting of a compressor block, a combustion chamber and a turbine block, a heat recovery system of a gas turbine engine and an external turbine connected to it, an exhaust gas heat recovery system is formed by an extended exhaust tract section the engine and the section of the pressure line of the main compressor passed through its cavity, while the section of the pressure line of the main Nogo compressor has an extensive heat-exchange surface, and the outer turbine is driven compressor unit of the gas turbine engine.

Distinctive features are significant, since the use of transported gas as a heat carrier in the recuperator and the working fluid in an external turbine can increase the energy efficiency of the gas turbine engine and the economic efficiency of the production and operation of the gas turbine engine, and the drive of the gas turbine compressor block from the external turbine allows you to direct the entire power of the gas turbine block to the main compressor.

The figure shows a diagram of the proposed combined GGPA:

1 - supply main gas pipeline;

2 - main compressor;

3 - external turbine;

4 - recuperator;

5 - discharge main gas pipeline;

6 - gas turbine engine;

7 - compressor block GTE;

8 - a gas turbine combustion chamber;

9 - turbine block GTE.

Combined GGPA works as follows. The transported gas is supplied to the compressor station via the inlet main gas pipeline 1. At the compressor station, the transported gas is compressed by the main compressor 2. The part of the transported gas necessary for operation in the external turbine 3 is fed through the pressure pipe of the main compressor 2 to the recuperator 4, the other part of the transported gas is discharged through the outlet gas pipeline 5. By means of the developed heat-exchange surface of the recuperator 4, the thermal energy of the exhaust of the gas stream of the gas turbine engine 6 is transferred to the transported gas, which goes to an external turbine 3, in which it, when doing work, is cooled, loses pressure to the parameters necessary for further transportation, and is diverted through the exhaust gas pipeline 5. The external turbine drives the compressor unit 7 of a gas turbine engine 6, supplying air to the combustion chamber 8, in which air is mixed with fuel, and the resulting air-fuel mixture is burned with the release of energy. Next, the gas stream is sent to the turbine unit 9, which converts the energy of the gas stream into useful work by rotating the main compressor 2.

Thus, the use of transported gas as a coolant in a recuperator and a working fluid in an external turbine can significantly increase the energy efficiency of the gas condensate heat exchanger, reduce the thermal impact on the environment, and reduce the cost of equipment and maintenance of the intermediate coolant systems. The drive of the compressor unit of the gas turbine engine from an external turbine allows the entire power of the turbine part of the gas turbine engine to be directed to the completion of useful work.

Claims (1)

A combined gas turbine gas pumping unit comprising a main compressor, a gas turbine engine consisting of a compressor unit, a combustion chamber and a turbine unit, a heat recovery system of a gas turbine engine and an external turbine connected thereto, characterized in that the exhaust heat recovery system therein is formed by an expanded exhaust section the engine path and the section of the pressure line of the main compressor passed through its cavity, while the section of the pressure pipe oprovoda main compressor has an extensive heat-exchange surface, and the outer turbine is driven compressor unit of the gas turbine engine.