JPH1089087A - Oil mist generator for gas turbine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the cooling ability of the bearing of a gas turbine so as to prevent the seizure of the bearing of the gas turbine, by arranging a heat exchanger in a line through which air compressed by the compressor of the gas turbine is supplied as air for generating oil mist which cools the bearing, to an oil mist generator. SOLUTION: A heat exchanger 7 is arranged in a line 12 extending from the compressor outlet port 3 of a gas turbine 1 to a flow divider 5, and fuel proceeding from a fuel tank 8 to a gas turbine engine fuel supply opening 9 is passed through this heat exchanger 7. Then, air which is passed through the flow divider 5, supplied to an oil mist generator 6, and compressed by the compressor of the gas turbine 1 so as to raise its temperature, is cooled in the heat exchanger 7. Compressed air cooled in the heat exchanger 7, is passed through the flow divider 5 and supplied to the oil mist generator 6, and oil mist is generated in the oil mist generator 6, then after that, this oil mist is carried to the bearing 2 of the gas turbine 1. Hereby, it can be certainly prevented that seizure occyrs to the bearing 2 causing damage to the bearing 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil mist generator for a gas turbine that generates oil mist for cooling a bearing.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional oil generator for a gas turbine. Air compressed by the compressor is taken out by a line 12 connected to a compressor outlet port 3 of the gas turbine 1 and the air is passed through an oil mist generator 6 for generating an oil mist.
Oil mist is supplied to The supply of the oil mist to the plurality of bearings is performed by dividing the air into the lines 12A and 12B by the flow divider 5 connected to the line 12, and supplying the air to the oil mist generators 6 provided in the lines 12A and 12B, respectively. This is performed by generating oil mist. Also, an orifice 4 is provided in one of the lines 12A that diverges from the air inlet side of the flow divider 5 to control the flow rate of the oil mist generated by the oil mist generator 6.

In FIG. 3, dotted arrows indicate the flow of air, and solid arrows indicate the flow of oil mist.

[0004]

In the conventional oil mist generator for a gas turbine, compressed air taken out from a compressor outlet port 3 of the gas turbine is used to generate oil mist. The air is compressed to increase the temperature to about 300 ° C., and the high-temperature air carries an oil mist to cool the bearing 2 of the gas turbine. However, since the heat-resistant temperature of the bearing 2 of the gas turbine is usually about 150 ° C., the bearing 2 may be seized and may be damaged.

An object of the present invention is to provide an oil mist generator for a gas turbine which can solve the above problems.

[0006]

An oil mist generator for a gas turbine according to the present invention supplies air compressed by a compressor of a gas turbine to an oil mist generator as oil mist generation air for cooling a bearing. The line is provided with a heat exchanger for cooling the air.

[0007] In the present invention, the air compressed and heated by the compressor of the gas turbine is supplied to the upper oil mist generator which is cooled and cooled by the heat exchanger. Therefore, the temperature of the oil mist generated by the oil mist generator and carried to the bearing is reduced, and the occurrence of seizure of the bearing can be prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. In the present embodiment, the following configuration is added to the oil mist generating device of the gas turbine shown in FIG. 3, and portions that are not changed are denoted by the same reference numerals as in FIG. 3, and description thereof will be omitted.

That is, in the present embodiment, a heat exchanger 7 for cooling air is provided on a line 12 of compressed air from the compressor outlet 3 of the gas turbine to the flow divider 5. Is designed to pass fuel from the fuel tank 8 to the gas turbine engine fuel supply port 9 as a refrigerant. Note that, in FIG. 1, double-line arrows indicate the flow of fuel.

In the present embodiment configured as described above, the air that has been heated by being compressed by the compressor of the gas turbine supplied to the oil mist generator 6 through the flow divider 5 is heated in the heat exchanger 7. It is cooled by fuel, which is a refrigerant.
This allows 3 at the compressor outlet 3 of the gas turbine.
Air having a temperature of about 00 ° C is cooled to about 70 ° C,
On the other hand, fuel at a temperature of about 20 ° C. is heated to about 30 ° C.

As described above, in the heat exchanger 7, about 70
The compressed air cooled to ° C. is supplied to an oil mist generator 6 via a flow divider 5, where the oil mist is generated and the oil mist is conveyed to a bearing 2 of a gas turbine. Accordingly, it is possible to reliably prevent the oil mist generator 6 having a normal heat-resistant temperature of about 100 ° C. and the bearing 2 of the gas turbine having a normal heat-resistant temperature of about 150 ° C. from being seized and damaged.

Further, since the fuel whose temperature has been raised in the heat exchanger 7 is supplied to the gas turbine 1, gasification of the fuel in the combustion chamber of the gas turbine 1 is promoted, and the stability of combustion can be improved.

A second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the first embodiment of the present invention is described.
The outside air from the air inlet 11 is introduced as a refrigerant into the heat exchanger 7 in the embodiment described above, and the outside air exiting the heat exchanger 7 is forcibly discharged from the ejector 10 using the exhaust gas of the gas turbine 1. I have to.

Also in the present embodiment, the air that is supplied from the compressor outlet port 3 of the gas turbine to the oil mist generator 6 in the heat exchanger 7 and generates oil mist can be cooled.

In this embodiment, the heat exchanger 7
The air compressed by the compressor of the gas turbine 1 at a temperature of about 300 ° C. is cooled to about 100 ° C., while the outside air from the air intake at a temperature of about 20 ° C. To ℃.

[0016]

According to the present invention, air compressed by the compressor of the gas turbine and heated is cooled by the heat exchanger.
The temperature can be lower than the oil mist generated by the conventional oil mist generator of a gas turbine without a heat exchanger, and the cooling capacity of the gas turbine bearing is increased to prevent seizure of the gas turbine bearing. In addition, the bearing of the gas turbine can be reduced in size or cost.

[Brief description of the drawings]

FIG. 1 is a system diagram of a first embodiment of the present invention.

FIG. 2 is a system diagram of a second embodiment of the present invention.

FIG. 3 is a system diagram of a conventional oil mist generator for a gas turbine.

[Description of Signs] 1 Gas turbine 2 Bearing 3 Compressor outlet port 4 Orifice 5 Divider 6 Oil mist generator 7 Heat exchanger 8 Fuel tank 9 Gas turbine engine fuel supply port 10 Ejector 11 Air intake port 12, 12A, 12B line

Claims (1)

[Claims] 1. A line for supplying air compressed by a compressor of a gas turbine to an oil mist generator as air for generating an oil mist for cooling a bearing is provided with a heat exchanger for cooling the air. Characteristic oil mist generator for gas turbine.