JP2010071120A - Bearing lubricant circulation device for gas turbine generating facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing lubricant circulation device for a gas turbine generating facility increasing power generating efficiency of the generating facility by reducing accessory motive power necessary for circulating lubricant and maintaining a good discharge state of lubricant. <P>SOLUTION: The length of a discharge pipe from a bearing part to a sub tank 11 is shortened, influence of conduit resistance is reduced, and good lubricant discharge from a bearing part is materialized by providing a discharge channel composed of two tanks of a sub tank 11 and a main tank 10 opened to atmospheric pressure. A liquid level of lubricant in the sub tank 11 is kept constant, and a good discharge condition is maintained without using an accessory for lubricant discharge by connecting the sub tank 11 and the main tank 10 by piping of a piping diameter securing a flow rate same as the flow rate for supply to the bearing part by a circulation pump from flow speed determined by a head between the two tanks. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bearing lubricant circulation device for a gas turbine power generation facility, and more particularly to a bearing lubricant circulation device for a gas turbine power generation facility suitable as a private power generation facility installed in a store or a hospital.

  Among gas turbine power generation facilities generally used as private power generation facilities, gas turbine power generation facilities with a capacity of 100 kW to 250 kW class use oil-lubricated bearings as generator bearings as disclosed in Patent Document 1. .

JP 2002-221090 A (paragraph number [0007] of the specification)

  The gas turbine power generation facility disclosed in Patent Document 1 pumps oil as a bearing lubricant by a pump and supplies the oil to a bearing portion. Since the bearing is normally opened to atmospheric pressure, the oil that lubricated the bearing is returned to the oil tank upstream of the pump, and the oil tank is exhausted to completely discharge the lubricant from the bearing. The air in the tank is exhausted to the outside by a fan to reduce the tank internal pressure from the atmosphere. Oil that has lubricated the bearing is discharged from the bearing portion by utilizing the pressure difference between the negative pressure in the tank due to smoke exhaustion in the oil tank and the atmospheric pressure in the bearing portion. Here, in order to discharge the lubricant from the bearing part satisfactorily, it is necessary to increase the pressure reduction in the oil tank, and the consumption of auxiliary power of the power generator increases. As a result, power generation efficiency is reduced. Also, if the return pipe length to the oil tank becomes longer, the lubricant discharge becomes worse by the increase in pipe resistance, resulting in an increase in the capacity of the smoke exhaust fan, an increase in auxiliary power, and a decrease in power generation efficiency. .

  The object of the present invention is to reduce the auxiliary power required for the circulation of the lubricant in the bearing lubricant circulation device applied to the gas turbine power generation equipment (for example, a gas turbine power generation equipment of 100 to 250 kW class with private power generation equipment). Thus, it is an object of the present invention to provide a bearing lubricant circulation device that can increase the power generation efficiency of the power generation equipment and can maintain a good discharge state of the lubricant.

  In order to achieve the above object, the present invention comprises a lubricant tank composed of two tanks opened to atmospheric pressure, and these two tanks are provided with a lubricant discharge tank (sub tank) installed below the bearing portion. It consists of a lubricant supply tank (main tank) installed at a position lower than this lubricant discharge tank, and once receives the lubricant discharged from the bearing in the sub tank, and flows the lubricant from the sub tank to the main tank by gravity. It is what I did.

  The lubricant discharge tank (sub tank) is preferably installed directly below the bearing portion, and the lubricant discharge pipe for discharging the lubricant from the bearing portion to the lubricant discharge tank is preferably a straight pipe.

  The lubricant discharge tank (sub tank) may be a pipe having a sufficiently larger cross-sectional area than the lubricant discharge pipe and opened to the atmospheric pressure.

  According to the present invention, a sub tank opened to the atmosphere for receiving the lubricant is provided below the bearing portion, and the lubricant received by the tank is opened to the atmospheric pressure installed at a lower position than the sub tank. It is made to flow only by gravity action. As a result, firstly, the smoke exhaust fan can be removed in order to reduce the auxiliary machine power, and second, good discharge can be realized only by the difference in potential energy, that is, the head difference. Therefore, it is not necessary to use auxiliary power for discharging the lubricant in the lubricant discharge section downstream of the generator bearing section, and it is possible to discharge the lubricant satisfactorily, so that the gas turbine power generation can further reduce auxiliary power. An equipment bearing lubricant circulation device can be provided.

  In particular, a sub-tank is installed directly under the bearing section, the lubricant discharge pipe distance between the bearing section and the sub-tank is shortened, and the piping is straight, thereby reducing the piping resistance between the bearing section and the sub-tank. Can be discharged well.

  Thus, by providing a discharge passage composed of two tanks, a sub tank and a main tank that are both open to the atmospheric pressure, the bearing lubricant discharge path can shorten the discharge pipe length from the bearing section to the sub tank. Therefore, the influence of the pipe resistance can be reduced, and good lubricant discharge from the bearing portion can be realized. Also, the sub tank and main tank are connected by a pipe with a pipe diameter that can secure the same flow rate as the flow rate supplied to the bearing by the circulation pump from the flow rate determined by the head difference between the two tanks. As a result, it is possible to maintain a good discharge state without using auxiliary equipment for discharge.

  Hereinafter, a first embodiment of the present invention will be described using a bearing lubricant circulation system of a gas turbine power generation facility shown in FIG.

  FIG. 1 shows a generator body and a bearing lubricant circulation device. The generator body is composed of a generator 1, a generator rotor 5, a bearing 4 indicating the rotor, a compressor 2 attached to the generator rotor, and a turbine 3. In FIG. 1, the generator main body is schematically shown, and detailed structures of the generator, the compressor, and the turbine, and components such as a casing are omitted. The bearing lubricant is stored in the main tank 10 and is supplied to the power generation body 1 through the lubricant supply pipe 6 by the circulation pump 7 (in this embodiment, the circulation pump 7 and the lubricant supply pipe 6 are connected to the tank. This is a system for supplying bearing lubricant to the bearing from the bearing.) A radiator 8 is installed on the downstream side of the circulation pump, heat is exchanged by the cooling air 15 from the radiator fan 9, and the heat absorbed by the bearing portion is released. The lubricant discharge pipes 13A and 13B are connected to the bearing and the sub tank 11 installed immediately below, and discharge the bearing lubricant to the sub tank (in this embodiment, the lubricant discharge pipes 13A and 13B are bearing from the bearing to the tank. It is a system that discharges lubricant.) Since both the bearing and the sub tank are open to the atmosphere, the lubricant is discharged only by the head difference between the bearing and the sub tank, but since the sub tank is installed directly under the bearing, it is hardly affected by the piping resistance. Drain the lubricant well without adding lubricant to the bearing. The sub tank 11 and the main tank 10 are connected by a connecting pipe 12. By appropriately selecting the pipe diameter of the connecting pipe, that is, by installing a pipe having a pipe diameter equal to the discharge speed determined by the head difference between the two tanks and the discharge flow rate of the circulation pump 7, the lubrication accumulated in the sub tank The agent flows into the main tank without overflowing the sub tank. According to the present embodiment, the lubricant storage tank does not require a smoke exhaust fan that maintains the internal pressure at a negative pressure, so that the auxiliary machine power can be reduced. Since it is dropped into the sub-tank, unnecessary lubrication of the lubricant does not occur in the bearing part, and it is possible to prevent the occurrence of problems such as leakage of the lubricant into the generator and to obtain a good drainage state. is there.

  FIG. 2 shows the generator and the bearing unit shown in FIG. The generator rotor 5 is supported by two bearings 4. The generator stator 29 has a donut shape with an open center, and is installed so as to surround the generator rotor 5 at the center. The bearing 4 installed on the bearing bracket 20 side is a combined bearing in which a thrust bearing and a journal bearing are integrated. The protrusion 27 of the generator rotor 5 is a thrust collar that serves as a contact surface of the thrust bearing. The bearing bracket 20 is provided with a bearing lubricant supply hole 21, and the lubricant supplied through the lubricant supply hole 21. After lubricating the bearing 4, the lubricant discharged from the left side of the bearing in FIG. 2 flows into the cavity 24 of the bearing bracket 20 and is discharged from the lubricant discharge pipe 13 to the sub tank 11 through the lubricant discharge hole 22. . The sub tank 11 is provided with an air hole 38 that is open to the atmosphere. The lubricant discharged from the right side of the bearing 4 flows into the cavity 28 of the bearing bracket 20, flows out into the cavity 24 of the bearing bracket through the lubricant discharge hole 23, and from the lubricant discharge pipe 13 through the lubricant discharge hole 22. It is discharged to the sub tank 11. The bearing bracket is provided with a labyrinth seal 25 so that the lubricant does not leak into the generator stator side, and a labyrinth seal 26 so as not to leak out of the generator. Similarly, the bearing 4 installed on the bearing bracket 30 side is a journal bearing. The bearing bracket 30 is provided with a lubricant supply hole 31 for a bearing lubricant, and the lubricant supplied through the lubricant supply hole 31 lubricates the bearing 4 and is then discharged from the left side of the bearing in FIG. The lubricant flows into the cavity 34 of the bearing bracket 30 and is discharged from the lubricant discharge pipe 13 to the sub tank 11 through the lubricant discharge hole 32. Further, the lubricant discharged from the right side of the bearing 4 flows into the cavity portion 36 of the bearing bracket 30, flows out into the cavity portion 34 of the bearing bracket through the lubricant discharge hole 33, and flows through the lubricant discharge hole 32 to the lubricant discharge pipe. 13 is discharged to the sub tank 11. A labyrinth seal 35 is installed on the bearing bracket so that the lubricant does not leak to the generator stator side. According to the present embodiment, the lubricant discharge pipe diameter can be made larger than or equal to the lubricant supply hole, and is connected to the sub-tank opened to the atmosphere at a short distance, so that the lubricant is discharged. As a result, the pipe resistance is small and the lubricant can be discharged well.

  The embodiment of FIG. 3 shows a state where a lubricant circulation device is installed in a package of a regeneration cycle gas turbine power generation facility having a capacity of 100 kW to 200 kW. A generator main body including the generator 1, the compressor 2, the turbine 3 and the combustor 40 is installed on the upper side of the partition floor plate 47 of the package frame 46. The main body has an upstream side connected to an intake duct 41 communicating with the atmosphere on the intake side of the compressor, and a downstream side connected to an exhaust duct 42, a regenerative heat exchanger 43, an exhaust silencer 44, and an exhaust duct 45. A power converter 48 that controls the number of revolutions of the generator rotor and controls the output of the generator is installed below the partition floor plate 47. The air taken into the turbine body enters from the intake duct 41 (arrow 50) and is discharged from the exhaust duct 45 to the atmosphere (arrow 51). On the other hand, the air used for cooling the lubricant is taken into the package from the atmosphere by an arrow 52 by the radiator fan 9 installed at the lower stage of the partition floor plate 47, and the power converter 48 is cooled and indicated by an arrow 53. Is discharged to the atmosphere outside the package (arrow 54). In FIG. 3, the sub-tank 11 for discharging the lubricant is disposed immediately below the generator 1 on the partition floor plate 47 and connected to the linear lubricant discharge pipes 13 </ b> A and 13 </ b> B. Further, the main tank 10 is installed at the lower stage of the partition floor plate 47 and is connected to the sub tank 11 by the connecting pipe 12. Since the sub-tank 11 is open to the atmosphere, the lubricant is discharged between the bearing portion in the generator and the sub-tank 11 due to the head difference between the two, but since the discharge pipe is straight and the distance is short, the pipe resistance The lubricant is discharged well. Similarly, the lubricant is returned to the main tank between the sub tank 11 and the main tank 10 only by the gravitational action due to the head difference between the two. By selecting the pipe diameter of the connecting pipe so that the product of the cross-sectional area of the connecting pipe 12 is equal to or greater than the lubricant supply volume flow rate from the flow rate determined by the head difference, the lubricant is discharged between the sub tank and the main tank. It can be done well. According to this embodiment, the lubricant can be discharged satisfactorily without installing an auxiliary machine such as a smoke exhaust fan on the lubricant discharge side, and the power generation efficiency can be improved by reducing the auxiliary power. There is.

  FIG. 4 is a diagram showing another embodiment of the present invention. In the embodiment of FIG. 4, instead of the sub tank installed on the partition floor plate 47, a pipe 55 having a large cross-sectional area is installed, and the pipe 55 is connected to the lubricant discharge pipes 13 </ b> A and 13 </ b> B and the connection pipe 12. Is. The piping 55 is provided with an air hole 38 to keep the inside of the piping 55 in an atmospheric pressure state. Since the cross-sectional area of the pipe 55 is sufficiently large, the volume is sufficient in the same manner as the sub tank shown in the embodiment of FIG. 3, and since the inside of the pipe is in the atmospheric pressure state, the lubricant is discharged from the generator bearing portion. The same effect as the embodiment shown in FIG.

  In this embodiment, the case where oil is assumed as the lubricant is described. However, the lubricant may be liquid, for example, when water is used as the lubricant (for example, disclosed in JP-A-2005-54779). The same effect can be obtained in the case of application to a gas turbine power generation facility.

The figure which shows 1st Embodiment of the gas turbine power generation equipment by this invention. Sectional drawing which shows the generator part of 1st Embodiment of the gas turbine power generation equipment by this invention. The figure which shows the installation state in the package of 1st Embodiment of the gas turbine power generation equipment by this invention. The figure which shows 2nd Embodiment of the gas turbine power generation equipment by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Generator 2 Compressor 3 Turbine 4A Combined type bearing 4B Journal bearing 5 Generator rotor 6 Lubricant supply pipe 7 Circulating pump 8 Radiator 9 Radiator fan 10 Main tank 11 Sub tank 12 Connection pipe 13A, 13B Lubricant discharge pipe 14 Lubricant 15 Cooling air (wind from radiator fan)
20, 30 Bearing bracket 21, 31 Lubricant supply hole 22, 23, 32, 33 Lubricant discharge hole 24, 28, 34, 36 Cavity 25, 26, 35 Labyrinth seal 27 Protrusion (thrust collar)
37 Bearing bracket shaft end cover 38 Air hole 40 Combustor 41 Intake duct 42 Exhaust duct 43 Regenerative heat exchanger 44 Exhaust silencer 45 Exhaust duct 46 Package frame 47 Partition floor plate 48 Power converter 50, 51 Flow of wind taken into turbine Arrows 52, 53, 54 Arrow 55 indicating the flow of wind taken into the package

Claims (7)

A lubricant circulation device for a bearing that supports a rotor of a generator,
A tank containing the bearing lubricant;
A system for supplying a bearing lubricant from the tank to the bearing;
Forming a lubricant circulation path from a system for discharging the bearing lubricant from the bearing to the tank;
The tanks are two tanks opened to atmospheric pressure, and are connected to a system for discharging the bearing lubricant, and are installed below the lubricant discharge tank, and the bearing lubricant And a lubricant supply tank connected to a system for supplying gas, and a pipe for connecting the lubricant discharge tank and the lubricant supply tank is provided. Circulation device. In the lubricant circulation device of the bearing that supports the rotor of the generator,
A tank containing the bearing lubricant,
A lubricant discharge tank that is disposed directly under the generator casing and opened to atmospheric pressure;
A lubricant supply tank that is installed at a lower position than the lubricant discharge tank and receives a bearing lubricant from the lubricant discharge tank;
A bearing lubricant circulation device for a gas turbine power generation facility, wherein a lubricant discharge pipe from the bearing is connected to the lubricant discharge tank. In claim 1,
A bearing lubricant circulation device for a gas turbine power generation facility, wherein the bearing and the lubricant discharge tank are connected by a linear lubricant discharge pipe. In claim 2,
A bearing lubricant circulation device for a gas turbine power generation facility, wherein the lubricant discharge pipe is a straight pipe. In any one of Claims 1-4,
The gas turbine power plant is located in the package,
The package is configured in two stages by a partition floor board,
The generator and the lubricant discharge tank are installed on the upper side of the partition floor plate, and the lubricant discharge tank is installed on the partition floor plate directly under the generator,
The said lubricant supply tank is installed under the said partition floor board, The bearing lubricant circulation apparatus of the gas turbine power generation equipment characterized by the above-mentioned. In any one of Claims 3-5,
A bearing lubricant circulation device for a gas turbine power generation facility, wherein a pipe having a sufficiently larger cross-sectional area than the lubricant discharge pipe and opened to an atmospheric pressure is used instead of the lubricant discharge tank. A gas turbine facility in which a compressor, a turbine, and a generator are supported by a coaxial rotor,
Bearings for supporting the rotor on both sides of the generator;
A lubricant supply pipe for supplying a lubricant to the bearing;
A tank for receiving the lubricant discharged from the bearing;
A circulation pump that is provided in a route of the lubricant supply pipe and feeds the lubricant in the tank;
The tank is provided with a lubricant discharge tank that is open to atmospheric pressure that receives the lubricant discharged from the bearing, and a lubricant that is installed below the lubricant discharge tank and receives the lubricant from the lubricant discharge tank. A gas turbine facility having an agent supply tank.

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