RU22507U1 - ENERGY INSTALLATION - Google Patents

Abstract

A power plant comprising a gas turbine engine combined with a turboexpander, an autonomous air compressor and a temperature-reducing heat exchanger, characterized in that the plant is equipped with a pressurized air reservoir connected through one shut-off valve to the turbine expander, and through another valve with an intermediate stage of the gas turbine engine compressor, this autonomous air compressor is connected by a pipe through a shut-off valve with a tank of high pressure air.

Description

   Mr. MUI: F02C6 / 00

Power plant

The proposed utility model relates to power plants. It can be used to create ground-based installations for the production of electricity and heat with high efficiency and high environmental performance, especially when they work near local oil and gas fields.

A comprehensive gas turbine installation is known that combines a turboexpander along a shaft with a gas turbine engine, the heat of the exhaust gases of which heat natural gas at the inlet of the tzfbodegander, which is useful to use excess pressure of natural gas to obtain power. The power of a turboexpander along with the power of a gas turbine engine increase the generation of electricity on an electric generator. This technical solution was taken as an analogue and is presented in the patent of the Russian Federation No. 2103615 with priority dated January 16, 1992. The disadvantage of the technical solution by analogy is the low reliability and attachment of the installation to the GDS, which leads to narrow limits of applicability.

A known gas turbine installation comprising a gas turbine engine combined with a turboexpander, an air compressor and a temperature-reducing heat exchanger. The output of an autonomous air compressor through a temperature-reducing heat exchanger is connected to the inlet of the turboexpander, the output of which, in turn, is connected to the inlet of the air compressor of the gas turbine engine. As a result, the temperature of the air entering the compressor of the gas turbine engine decreases, which allows to increase its power and resource. This technical solution is taken as a prototype and is presented by the patent of the Russian Federation No. 2145386 class. F02C7 / 143 dated 12.23.1997 However, the disadvantage of the technical solution for the prototype is the lack of multifunctionality and the need for continuous operation of an autonomous air compressor.

The proposed technical solution differs from the known one in that the installation is equipped with a pressurized air reservoir connected through one shut-off valve to a turbo-expander, and through another valve to an intermediate stage of a gas turbine engine compressor, while an autonomous air compressor is connected by a pipeline through a shut-off valve to the increased air reservoir pressure.

The proposed device with the noted differences provides increased reliability of the installation, expands its consumer properties, in particular, allows you to start the gas turbine engine using air from the tank without the inclusion of an autonomous air compressor and the use of standard starting systems.

The structural diagram of the installation that implements the proposed utility model is shown in the figure. It includes a gas turbine engine 1 with an inlet part 2 of an air compressor and with an electric generator 3, a turboexpander 4, an autonomous air compressor 5, a temperature-reducing heat exchanger 6, a system 7 for supplying natural gas to a gas turbine engine 1, a heat consumption system 8, a pressure tank 9, shut-off valves 10, 11, 12 and 13.

The operation of the power plant, schematically represented in the figure, is as follows. From the tank 9 through the shut-off valve 10 to the inlet of the turboexpander 4 is fed compressed wozuk. The cold rolling of the rotor of the gas turbine engine 1 begins. After the cold rolling through the system 7, the natural gas is fed into the gas turbine engine 1 and started. During the operation of the power plant, an intermediate stage of the compressor 1 is selected for compressed air, which is sent through the shut-off valve 11 to the compressed air tank 9 until the required pressure level is reached in it. A stand-alone air compressor 5 is connected to the reservoir 9 through a shut-off valve 13 and can additionally accumulate high pressure air in it. The air entering the reservoir 9, after some time, is cooled to a temperature close to the ambient temperature.

If it is necessary to increase the power output and efficiency of the gas turbine engine 1 (which may be required at an ambient temperature higher than normal temperature - 288 K), an autonomous air compressor 5 is activated when the valve 10 and the open 12 are open. High pressure and temperature air after the compressor 5, Having passed the temperature-reducing heat exchanger 6, which transfers heat to the system 8, it enters the turbine expander 4 and after it with a temperature lower than the ambient temperature enters the air inlet 2 1 litter turbomachine where it smeschivaetsya with ambient air by suction. For the same purpose, compressed air can be supplied to the turboexpander 4 from the tank 9 with the valve 10 open and the compressor 5 turned off (valve 12 closed). Simultaneous air supply to Turbo expander 4 from compressor 5 and reservoir 9 is also possible

(valves 10 and 12 open). In a turbo-expander, as a result of a decrease in pressure and air temperature, useful power is generated, which is summed up with the power of the gas turbine engine 1 and transferred to the electric generator 3. As a result of mixing the atmospheric air and air flow entering the input 2 of the air compressor of the gas turbine engine 1, the average temperature decreases after the turbine expander 4 the air entering the air compressor of the gas turbine engine 1, against the ambient temperature. The turboexpander 4 may have an adjustable nozzle apparatus with which pressure and air temperature after the turboexpander can be adjusted.

Improving the efficiency and reliability of the power plant shown in the figure is due to the use of high pressure air tank 9 in its composition. The air from this tank is used to increase the power of the power plant, as well as to start it using a turboexpander 4. For example, it is possible to start the PAES2500 gas turbine unit (2500 kW) with the following parameters:

-volume of the tank 9 -

- air pressure in the tank 9 - kg / cm;

-temperature in the tank 9 - .... 300 K;

The reservoir 9 is replenished with high-pressure air by air taken after the intermediate stage of the compressor of a gas turbine installation or from a stand-alone air compressor 5 with the parameters:

- air pressure behind the compressor - kg / cm;

- air temperature behind the compressor - K

-Air flow through the compressor -, 35 kg / s. Directly during the start of the replenishment of the tank 9 is not required. Using the proposed utility model makes it possible to increase the reliability and

the quality of starting a gas turbine engine (installation), abandoning the use of an auxiliary gas turbine engine and an electric starter (necessary for a regular start), as well as increasing the power output of a power plant with or without an autonomous air compressor.

The proposed utility model is supposed to be used in the SIC CIAM on the basis of the PAES-2500 power plant.

Claims (1)

A power plant comprising a gas turbine engine combined with a turboexpander, an autonomous air compressor and a temperature-reducing heat exchanger, characterized in that the plant is equipped with a pressurized air reservoir connected through one shut-off valve to the turbine expander, and through another valve with an intermediate stage of the gas turbine engine compressor, this autonomous air compressor is connected by a pipe through a shut-off valve with a tank of high pressure air.