JP5450158B2 - Lubricating oil supply device for bearings in power plants - Google Patents

Description

  The present invention relates to a bearing lubricating oil supply device used in a power generation steam turbine, gas turbine, and the like in a power plant.

  Conventionally, in a combined cycle power plant that has been provided with a gas turbine, a generator, a steam turbine, etc., and the lubricating oil is supplied from a common oil pump with a lubricating oil tank to the gas turbine and the steam turbine, The chamber metal temperature (the temperature of the casing surrounding the gas turbine) is a temperature at which the turning operation can be stopped due to the natural cooling of the turning operation after the operation is stopped, and there is a possibility that the metal of the bearing will deteriorate soon. The oil pump that supplies no lubricating oil will be at a stoppable temperature.

On the other hand, the temperature of the casing metal of the steam turbine (the temperature of the casing surrounding the steam turbine) is the temperature at which the turning operation can be stopped, but because of the high temperature steam, etc., it does not immediately reach the temperature at which the oil pump can be stopped. Wait until the turbine casing metal temperature drops to a temperature at which the oil pump can be stopped, or lower the steam turbine casing metal temperature to a temperature at which the oil pump can stop using the steam turbine forced cooling system. ing.
In addition, there exist the following patent documents 1-4 as a prior art document which concerns on this application.

JP 2007-146811 A Japanese Patent Laid-Open No. 06-159588 Japanese Patent Laid-Open No. 02-055807 Japanese Patent Laid-Open No. 01-138305

By the way, in the above combined cycle power plant, in order to efficiently perform the open inspection of the gas turbine, it is necessary to stop the oil pump. Since the stoppable temperature is not reached, there is a problem that the open inspection of the gas turbine cannot be performed efficiently.
Therefore, a steam turbine forced cooling device is used in order to quickly perform an open inspection of the gas turbine, but this causes a problem that a new cost increase is caused.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a lubricating oil supply device for a bearing of a power plant that can efficiently perform open inspection of a gas turbine.

To achieve the above object, a bearing lubricating oil supply device for a power plant according to the present invention is a bearing lubricating oil supply device for a combined cycle power plant comprising a gas turbine, a generator, and a steam turbine, a gas turbine and the steam turbine of the turbine rotor and bearing lubricating oil supply system for supplying each lubricating oil to the bearing, arranged in the lubricating oil supply system to the gas turbine bearings when performing overhaul of the gas turbine A closing member that prevents supply of lubricating oil to the bearing of the gas turbine; and an orifice provided in the lubricating oil supply system to the bearing of the gas turbine so as to be replaceable with the closing member. When the opening inspection is performed, the closing member is disposed in the lubricating oil supply system to the bearing of the gas turbine. While inhibiting the supply of the lubricating oil, during operation of the gas turbine, the supply of the orifice in the lubricating oil supply system to the bearing of the gas turbine is disposed the lubricating oil is being performed.

  ADVANTAGE OF THE INVENTION According to this invention, the lubricating oil supply apparatus for bearings of a power plant which can implement | achieve the open inspection of a gas turbine efficiently is realizable.

It is a notional block diagram which shows the lubricating oil supply apparatus for bearings of the combined cycle power plant of embodiment concerning this invention. It is a block diagram which shows the control apparatus which controls the lubricating oil supply apparatus for bearings containing the gas turbine of embodiment. (a) is the figure which showed the structure of the piping around the 1st bearing oil supply orifice shown in FIG. 1, (b) is the front view and right view of the 1st bearing oil supply orifice attached to piping, (c) is the front view and right view of a closing plate which are exchanged with the 1st bearing oil supply orifice of piping, and are attached to piping. It is a start permission logic figure of the jacking oil pump of the lubricating oil supply apparatus for bearings of a power plant of an embodiment. It is a turning operation start permission logic figure of the lubricating oil supply apparatus for bearings of a power plant of an embodiment.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a conceptual configuration diagram illustrating a bearing lubricating oil supply device P of a combined cycle power generation (combined thermal power generation) plant according to an embodiment.
The combined cycle power plant (hereinafter referred to as a power plant) of the embodiment generates power from the generator 17 using the gas turbine 1, and then converts the steam turbine (2, 3) by steam generated using the exhaust heat. The bearing lubricating oil supply device P, which is a plant that rotates and generates electric power with the generator 17 and that will be described in detail below, is particularly designed to improve the efficiency of open inspection of the gas turbine 1.

  The power plant according to the embodiment includes a gas turbine 1 that generates rotational motion by receiving impact force of a high-pressure combustion gas of liquid fuel on rotating blades, and exhaust of the gas turbine 1 from water of a condenser (not shown) described later. An exhaust heat recovery boiler (not shown) that generates high-temperature and high-pressure steam using heat and the like, and a high-pressure steam turbine 3 that generates rotational motion by receiving the impact force of the high-temperature and high-pressure steam from the exhaust heat recovery boiler on the rotating blades The rotation of each of the medium-low pressure steam turbine 2 that generates the rotational motion by receiving the impact force of the medium-low pressure steam discharged from the high-pressure steam turbine 3 on the rotary blades, and the gas turbine 1 and the high-pressure / medium-low pressure steam turbines 3, 2. A generator 17 that induces an electromotive force by a relative motion between a magnetic field and a conductive wire by movement, and a condenser that returns the steam discharged from the intermediate-low pressure steam turbine 2 to water are provided.

In the gas turbine 1, the shaft is supported (supported) by the first bearing 4 and the second bearing 5, and the thrust acting in the axial direction is supported by the first thrust bearing 6.
The intermediate / low pressure steam turbine 2 is supported by a third bearing 4a and a fourth bearing 2b, and a thrust acting in the axial direction is supported by a second thrust bearing 2s. The high-pressure steam turbine 3 is supported by the fourth bearing 2b and the fifth bearing 3a on the shaft, and supported by the second thrust bearing 2s on the axially acting thrust.

A lubricating oil supply device P for a bearing of a power plant shown in FIG. 1 includes a lubricating oil tank 10T for storing lubricating oil, bearings (4, 5, 6) of the gas turbine 1 and high-pressure / medium-low pressure steam turbine 3 for lubricating oil. And a main oil pump 10 for feeding oil to the two bearings (2a, 2b, 2s, 3a). In this power plant, the gas turbine 1 and the medium and low pressure / high pressure steam turbines 2 and 3 are respectively connected to bearings (4, 5, 6, 2a, 2b) from the main oil pump 10 with a common lubricating oil tank (10T). 2s, 3a) is a uniaxial power plant to which lubricating oil is supplied.
In FIG. 1, a thick solid line from the main oil pump 10 of the lubricating oil tank 10T indicates a line for supplying lubricating oil by the main oil pump 10, and the bearings (4, 5, 6) and the bearings (2a, 2b, 2s, 3a) of the medium and low-pressure / high-pressure steam turbines 2 and 3 to the lubricating oil tank 10T are thin solid lines indicating the bearings (4, 5, 6) and bearings (2a, 2b). 2s, 3a) to the lubricating oil tank 10T.

The oil supply line from the main oil pump 10 of the lubricating oil tank 10T to the bearings (4, 5, 6, 2a, 2b, 2s, 3a) has a bearing (4, 5, , 6, 2 a, 2 b, 2 s, 3 a), a main oil cooler 12 for cooling the lubricating oil that has become hot due to the circulation, and a lubricating oil filter 13 for filtering out foreign matters mixed in the lubricating oil by the circulation, It has.
Moreover, the bearing lubricating oil supply device P of the power plant has a jacking oil pump 11 connected to piping from the lubricating oil tank 10T to the bearings (4, 5, 2a). In order to reduce the rotational friction of the rotor when the turbine 1 is started or stopped, lubricating oil serving as jacking oil is injected into the first bearing 4 and the second bearing 5, and the rotation of the rotor when the intermediate / low pressure steam turbine 2 is started or stopped. In order to reduce friction, the lubricating oil of jacking oil is injected into the 3rd bearing 2a.

In FIG. 1, oil supply lines from the piping of the lubricating oil tank 10T connected to the jacking oil pump 11 to the first bearing 4 and the second bearing 5 of the gas turbine 1 through the jacking oil pump 11 The oil feed line up to the third bearing 2a of the intermediate / low pressure steam turbine 2 is indicated by a thick broken line.
Here, the high pressure steam turbine 3 is not supplied with jacking oil from the jacking oil pump 11 because the rotor has a smaller weight than the gas turbine 1 and the medium / low pressure steam turbine 2 and has a small axial load.
The jacking oil from the jacking oil pump 11 may be supplied to the bearings (2b, 3a) of the high-pressure steam turbine 3.

<Pressure detectors 20, 21, 7A, 7B>
Next, the pressure detectors 20, 21, 7A, 7B that detect the pressure of the lubricating oil provided in the bearing lubricating oil supply device P of the power plant will be described.
The bearing lubricant supply device P is provided with a pressure detector 20 in the lubricant supply pipe from the lubricant tank 10T, and the pressure detector 20 detects the pressure of the lubricant sent from the lubricant tank 10T. To do. A pressure detector 21 is provided at the outlet of the jacking oil pump 11, and the pressure detector 21 detects the pressure of the lubricating oil at the outlet of the jacking oil pump 11.

In addition, a pressure detector 7A is provided on the downstream side of the first bearing oil supply orifice 8 that restricts the flow rate of the lubricating oil supplied to the first bearing 4 of the gas turbine 1, and the pressure detector 7A includes the first detector 7A. The pressure of the lubricating oil downstream of the bearing oil supply orifice 8 is detected. Further, a pressure detector 7B is provided on the downstream side of the second bearing oil supply orifice 9 for restricting the flow rate of the lubricating oil supplied to the second bearing 5 and the first thrust bearing 6, and the pressure detector 7B The pressure of the lubricating oil downstream of the second bearing oil supply orifice 9 is detected.
For the pressure detectors 20, 21, 7A, 7B, for example, a pressure sensor that extracts a mechanical displacement of the diaphragm caused by the pressure of the lubricating oil as an electric signal using a link, an electromagnet, or the like is used. Any pressure detector can be selected as appropriate.

<Thermometers t1, t2, t3>
Next, thermometers t1, t2, and t3 for detecting the casing metal temperature of the gas turbine 1 and the casing metal temperatures of the medium / low / high pressure steam turbines 2 and 3 provided in the bearing lubricant supply device P of the power plant, respectively. Will be described.
A casing 1c that forms an outer shell of the gas turbine 1 is provided with a thermometer t1 for measuring a casing metal temperature of the gas turbine 1 (temperature of the casing 1c).

In addition, a thermometer t2 for measuring the casing metal temperature (temperature of the casing 2c) of the intermediate / low pressure steam turbine 2 is provided in the casing 2c that forms the outline of the intermediate / low pressure steam turbine 2, A casing 3c that forms the outer shell of the high-pressure steam turbine 3 is provided with a thermometer t3 for measuring the casing metal temperature of the high-pressure steam turbine 3 (the temperature of the casing 3c).
The thermometers t1, t2, and t3 are, for example, contact-type temperature sensors that use thermocouples that detect temperature with the Seebeck effect thermoelectromotive force, but are not limited thereto.

<Control Device 14 of Bearing Lubricating Oil Supply Device P>
Next, the control device 14 that controls the bearing lubricant supply device P including the gas turbine 1 of the power plant will be described.
FIG. 2 is a block diagram showing the control device 14 that controls the bearing lubricant supply device P including the gas turbine 1.
The control device 14 includes a pressure detector 7A that detects a pressure downstream of the first bearing oil supply orifice 8, a pressure detector 7B that detects a pressure downstream of the second bearing oil supply orifice 9, and a lubricating oil supplied to the bearing. Based on the detected value of the pressure detector 20 for detecting the pressure of the oil and the pressure detector 21 for detecting the pressure of the lubricating oil at the outlet of the jacking oil pump 11, the rotation and stop of the gas turbine 1 and the main oil oil pump are detected. 10. The operation and stop of the jacking oil pump 11 are controlled.
In addition, the control apparatus 14 is realizable by well-known means, such as a computer and a circuit.

In addition to the control device 14, the power plant is provided with a control device (not shown) for controlling the medium / low pressure / high pressure steam turbines 2 and 3, a common control device (not shown) for the power plant P, and the like. Yes.
Here, the aspects of these control devices are not limited to those illustrated, but may be configured by a single control device, or may be configured by a plurality of arbitrary control devices. Aspects can be selected as appropriate.

<Configuration of piping around first and second bearing oil supply orifices 8 and 9>
Next, the configuration of the pipes 8A and 8B around the first bearing oil supply orifice 8 for supplying lubricating oil to the first bearing 4 of the gas turbine 1 shown in FIG. 1, the second bearing 5 of the gas turbine 1, and the first thrust bearing. The structure of the pipes 9A and 9B around the second bearing oil supply orifice 9 for supplying lubricating oil to 6 will be described in detail.
The configuration of the pipes 8A and 8B around the first bearing oil supply orifice 8 and the configuration of the pipes 9A and 9B around the second bearing oil supply orifice 9 are the same, and therefore the structure around the first bearing oil supply orifice 8 is the same. The configuration of the pipes 8A and 8B will be described, and the description of the configuration of the pipes 9A and 9B around the second bearing oil supply orifice 9 will be omitted.

  3A is a view showing the configuration of the pipes 8A and 8B around the first bearing oil supply orifice 8 shown in FIG. 1, and FIG. 3B is a diagram showing the first bearing oil supply attached to the pipes 8A and 8B. FIG. 3C is a front view and a right side view of the closing plate 28 which is attached to the pipes 8A and 8B in place of the first bearing oil supply orifices 8 of the pipes 8A and 8B. FIG. Note that the arrows in FIG. 3A indicate the direction of the flow of supply of the lubricating oil to the first bearing 4.

The first bearing oil supply orifice 8 attached to the pipes 8A and 8B shown in FIG. 1 is formed at the center of the first orifice member 18 shown in FIG.
The first orifice member 18 is formed into a substantially rectangular shape by sheet metal processing using, for example, a stainless steel plate, and four bolt insertion holes 18a through which the fixing bolts b are inserted are drilled at four peripheral portions thereof. Yes. A gripping portion 18b that is chucked by a robot or gripped by an operator is formed on one side of the first orifice member 18 so as to protrude outward.

On the other hand, when the gas turbine 1 is opened and inspected, a closing plate 28 (see FIG. 3C) is attached to the pipes 8A and 8B instead of the first orifice member 18 shown in FIG.
The closing plate 28 is formed in a substantially rectangular shape by sheet metal processing using, for example, a stainless steel plate, and four bolt insertion holes 28a through which the fixing bolts b are inserted are drilled at four peripheral portions thereof. In addition, a grip portion 28b that is chucked by a robot and gripped by an operator is formed to protrude outward.
The first and second orifice members 18 and 19 and the closing plates 28 and 29 have been described by exemplifying the case of using a stainless steel plate. However, any material other than stainless steel can be used as long as it has a strength capable of preventing the supply of lubricating oil. A metal, a resin material, etc. may be sufficient and the material of the 1st, 2nd orifice members 18 and 19 and the closing plates 28 and 29 is not limited to stainless steel, It can select suitably.

Next, the first orifice member 18 (see FIG. 3B) in which the first bearing oil supply orifice 8 is formed in the pipes 8A and 8B and the first orifice member 18 installed in the pipes 8A and 8B are attached. The operation of exchanging with the closing plate 28 (see FIG. 3C) will be described.
As shown in FIG. 3A, the first orifice member 18 in which the first bearing oil supply orifice 8 is formed includes a first pipe 8A in which the flange 8A1 is formed and a second pipe 8B in which the flange 8B1 is formed. The first orifice member 18 is fixed to the first pipe 8A and the second pipe 8B by being sandwiched and inserted through the flange 8A1 and the flange 8B1 and stopped by the nut n. In addition, although the bolt b and the nut n for fixation have illustrated the case of four, of course, it is not limited to four.

On the other hand, when the gas turbine 1 is inspected for opening, the nut n is removed from the bolt b, and the first orifice member 18 is removed from the pipes 8A and 8B. Then, a closing plate (closing member) 28 that does not allow the lubricating oil to pass is sandwiched between the flange 8A1 of the first pipe 8A and the flange 8B1 of the second pipe 8B, and the four bolts b are inserted into the flange 8A1 and the flange 8B1. By stopping with the nut n, the closing plate 28 is fixed between the first pipe 8A and the second pipe 8B.
Thereby, since the closing plate 28 which does not let lubricating oil pass between the 1st piping 8A and the 2nd piping 8B is installed, supply of the lubricating oil to the 1st bearing 4 is stopped.
As described above, the pipes 9A and 9B around the second bearing oil supply orifice 9 for supplying lubricating oil to the second bearing 5 and the first thrust bearing 6 of the gas turbine 1 shown in FIG. Similarly to the configuration of the pipes 8A and 8B around the first bearing oil supply orifice 8, a second orifice member 19 in which the second bearing oil supply orifice 9 is formed and a closing plate 29 through which the lubricating oil does not pass are provided. It is a configuration to be exchanged.

With this configuration, when opening inspection of the gas turbine 1 is performed, the casing metal temperature of the gas turbine 1 (temperature of the casing 1c) is lowered to an oil pump stoppable temperature (for example, 150 ° C.) by turning operation. Then, the cabin metal temperature (the temperature of the casings 2c, 3c) of the medium / low pressure / high pressure steam turbines 2, 3 is lowered to a temperature at which the turning operation can be stopped. At this time, the main oil pump 10 is temporarily stopped to prevent the lubricating oil from flowing even if the interior metal pressure of the medium / low pressure / high pressure steam turbines 2 and 3 (temperature of the casings 2c and 3c) does not drop to the oil pump stoppable temperature. The supply is stopped, the first orifice member 18 is replaced with the closing plate 28 and the second orifice member 19 is replaced with the closing plate 29, and the first bearing 4, the second bearing 5, and the first thrust bearing 6 of the gas turbine 1 are replaced. Stop supplying lubricant to Then, the operation of the main oil pump 10 can be started to supply the lubricating oil to the medium and low pressure / high pressure steam turbines 2 and 3 to cool the gas turbine 1 while performing the open inspection.
In addition, the replacement | exchange operation | work with the 1st orifice member 18 and the closing plate 28 in which the 1st bearing oil supply orifice 8 was formed, and the replacement | exchange with the 2nd orifice member 19 and the closing plate 29 in which the 2nd bearing oil supply orifice 9 was formed. The work may be performed by a robot or manually.

<Process of open inspection of gas turbine 1>
Next, the work process of the open inspection of the gas turbine 1 performed by stopping the steady operation of the power plant will be described.
The following control is performed using the control device 14 of the bearing lubricant supply device P including the gas turbine 1 and the like.
After the steady operation of the power plant P is stopped, the gas turbine 1 and the medium / low pressure / high pressure steam turbines 2 and 3 are shifted to a turning operation at a low speed so that the rotor of the entire impeller is not curved, and naturally cooled. Is done.

Due to this natural cooling, the temperature of the casing metal of the gas turbine 1 (the temperature of the casing 1c) is lowered to a temperature at which the turning operation can be stopped (for example, 180 ° C.) at which there is no risk of bending of the rotor. The temperature of the oil pump can be stopped (for example, 150 ° C.) at which the metal of the second bearing 5 and the first thrust bearing 6 is not likely to be damaged. Further, when the intermediate / low pressure steam turbine 2 and the high pressure steam turbine 3 reach a temperature at which the turning operation can be stopped without causing the rotor to bend, the main oil oil pump 10 is stopped.
Thereafter, the first bearing oil supply orifice 8 (first orifice member 18) and the closing plate 28 installed in the pipes 8A and 8B supplying the lubricating oil to the first bearing 4 of the gas turbine 1 are set as described above. Replace promptly.

Specifically, as shown in FIG. 3, a nut in which a first orifice member 18 having a first bearing oil supply orifice 8 fixed between a first pipe 8A and a second pipe 8B is screwed to a bolt b. n is removed, and a closing plate 28 is sandwiched between the flange 8A1 of the first pipe 8A and the flange 8B1 of the second pipe 8B, and the flange 8A1 of the first pipe 8A and the flange 8B1 of the second pipe 8B Each of the four bolts b is inserted and a nut n is screwed. Thereby, the closing plate 28 is fixed between the flange 8A1 of the first pipe 8A and the flange 8B1 of the second pipe 8B, and the supply of the lubricating oil to the first bearing 4 can be stopped.
In a similar operation, the second bearing oil supply fixed between the first pipe 9A and the second pipe 9B for supplying lubricating oil to the second bearing 5 and the first thrust bearing 6 of the gas turbine 1 shown in FIG. The second orifice member 19 in which the orifice 9 is formed is replaced with a closing plate 29 that does not allow the lubricating oil to pass.

After the replacement work to the closing plates 28 and 29 is completed, the operation of the main oil pump 10 is started, and the third bearing 4a, the fourth bearing 2b, and the second thrust bearing 2s of the medium and low pressure / high pressure steam turbines 2 and 3 are started. Then, an open inspection of the gas turbine 1 is performed while the lubricating oil is supplied to the fifth bearing 3a to naturally cool the intermediate / low pressure / high pressure steam turbines 2 and 3.
After completion of the gas turbine opening inspection, the closing plates 28 and 29 are replaced with the first and second bearing oil supply orifices 8 and 9 (first and second orifice members 18 and 19) as follows.

Specifically, the operation of the main oil pump 10 is stopped, and the closing plate 28 that does not pass the lubricating oil fixed between the first pipe 8A and the second pipe 8B shown in FIG. The attached nut n is removed, and the first orifice member 18 in which the first bearing oil supply orifice 8 is formed is sandwiched between the flange 8A1 of the first pipe 8A and the flange 8B1 of the second pipe 8B. Four bolts b are respectively inserted into the flange 8A1 and the flange 8B1 of the second pipe 8B, and a nut n is screwed. As a result, the first orifice member 18 in which the first bearing oil supply orifice 8 is formed is fixed between the first pipe 8A and the second pipe 8B, and the first bearing member 4 is connected to the first bearing 4 via the first bearing oil supply orifice 8. It is possible to supply the lubricating oil.
Similarly, the second bearing oil supply orifice 9 is formed with the closing plate 29 that does not pass the lubricating oil fixed to the pipes 9A and 9B following the second bearing 5 and the first thrust bearing 6 of the gas turbine 1 shown in FIG. The second orifice member 19 is replaced with a lubricating oil supply to the second bearing 5 and the first thrust bearing 6 through the second bearing oil supply orifice 9.

Thereafter, the operation of the main oil pump 10 is started, and the power plant starts the operation of the jacking oil pump 11 and the turning operation of the gas turbine 1, the intermediate / low pressure / high pressure steam turbines 2, 3 in order to shift to the steady operation. To do.
Here, there is a possibility of a turning operation in an oil-free state due to the fact that the replacement work from the closing plates 28 and 29 to the first and second bearing oil supply orifices 8 and 9 after completion of the open inspection is not performed.
Therefore, the pressure of the first bearing 4 (the lubricating oil pressure detected by the pressure detector 7A in FIG. 1) is 0.10 MPa or more, and the pressures in the second bearing 5 and the first thrust bearing 6 (pressure detection in FIG. 1). The pressure of the lubricating oil detected by the vessel 7B) is 0.10 MPa or more as a turning start permission condition, and the start permission condition for the jacking oil pump 11 is set.
The turning activation permission condition and the jacking oil pump activation permission condition are not limited to the exemplified values, and can be set as appropriate according to the specifications of the power plant.

In the transition to the steady operation of the power plant after the completion of the open inspection of the gas turbine 1, the jacking oil pump 11 shown in FIG. 4 described below is started, and then the turning operation shown in FIG. After the turning operation, the rotational speed is increased and the power plant P is shifted to a steady operation. 4 is a start permission logic diagram of the jacking oil pump 11 of the bearing lubricant supply device P of the power plant, and FIG. 5 is a turning operation start permission logic of the bearing lubricant supply device P of the power plant. FIG. 4 and 5 are IBD (Interlock Block Diagram). In the case of (WO) in the figure, when the information indicated by the arrow is entered in (WO), the processing indicated by (WO)-> is stopped. It means to do.
On the other hand, when shifting to the open inspection of the gas turbine 1 after the steady operation of the power plant, the transition is made from the steady operation to the low speed operation, and the jacking oil pump 11 shown in FIG. Turning operation is activated.

<Permission to start the jacking oil pump 11>
Next, activation permission of the jacking oil pump 11 will be described.
As shown in FIG. 4, the start-up of the jacking oil pump 11 for reducing the rotational friction of the rotor at the start-up of the gas turbine 1 and the medium / low pressure steam turbine 2 is determined by the prescribed (predetermined) rotational speed of the gas turbine 1. Hereinafter, for example, in the case of a steady rotation speed of 3000 rpm, the condition is 2000 rpm or less.
And when the pressure of the lubricating oil sent with the pressure detector 20 shown in FIG. 1 is less than a prescribed (predetermined) value, the jacking oil pump 11 is not started.
Further, the pressure of the first bearing 4 measured by the pressure detector 7A is less than a prescribed (predetermined) value (0.10 MPa) or the pressure of the second bearing 5 and the first thrust bearing 6 measured by the pressure detector 7B is prescribed ( When it is less than (predetermined) value (0.10 MPa), the first bearing 4 or the second bearing 5 and the first thrust bearing 6 are low in lubricating oil pressure. The replacement work from the plate 28 to the first bearing oil supply orifice 8 is not performed, or the replacement work from the closing plate 29 on the second bearing 5 and the first thrust bearing 6 side to the second bearing oil supply orifice 9 is performed. Since it may not be performed, the jacking oil pump 11 is not started.

In other words, the start-up of the jacking oil pump 11 requires that the rotational speed of the gas turbine 1 is not more than a specified (predetermined) rotational speed and the supplied lubricating oil pressure is not less than a specified (predetermined) value. It is.
Further, when the pressure of the first bearing 4 is a specified (predetermined) value (0.10 MPa) or more and the pressure of the second bearing 5 and the first thrust bearing 6 is a specified (predetermined) value (0.10 MPa) or more, Since the pressures of the lubricating oil in the first bearing 4, the second bearing 5, and the first thrust bearing 6 are not less than a prescribed (predetermined) value, the first bearing oil supply from the closing plate 28 on the first bearing 4 side after the opening inspection is completed. Since it is clear that the replacement operation to the orifice 8 and the replacement operation from the closing plate 29 on the second bearing 5 and first thrust bearing 6 side to the second bearing oil supply orifice 9 are performed, the jacking oil pump 11 Startup is performed.

<Turning operation start permission>
Next, turning operation start permission of the power plant will be described.
As shown in FIG. 5, in the turning operation aiming at curving due to a sudden change in the temperature of the rotor before or after the steady operation of the gas turbine 1 is started, the rotor of the turbine 1 for starting the turning is specified (predetermined). ) Rotation speed (for example, 2/3 rpm) or less.
When the pressure at the outlet of the jacking oil pump 11 measured by the pressure detector 21 shown in FIG. 1 is less than a prescribed (predetermined) value, or the pressure of the supplied lubricating oil measured by the pressure detector 20 is If it is less than the specified (predetermined) value, turning operation is not performed.

  Further, the pressure of the first bearing 4 measured by the pressure detector 7A is less than a prescribed (predetermined) value (0.10 MPa) or the pressure of the second bearing 5 and the first thrust bearing 6 measured by the pressure detector 7B is prescribed ( When it is less than (predetermined) value (0.10 MPa), the first bearing 4 or the second bearing 5 and the first thrust bearing 6 are low in lubricating oil pressure. The replacement operation from the plate 28 to the first bearing oil supply orifice 8 is not performed, or the replacement operation from the closing plate 29 on the second bearing 5 and the first thrust bearing 6 side to the second bearing oil supply orifice 9 is performed. Turning operation is not performed because there are times when it is not.

In other words, in the turning operation, the rotor of the gas turbine 1 has a specified (predetermined) rotational speed (for example, 2/3 rpm) or less, and the pressure at the outlet of the jacking oil pump 11 exceeds a specified (predetermined) value. In addition, the condition is that the pressure of the supplied lubricating oil is not less than a specified (predetermined) value.
Further, the pressure of the first bearing 4 is a specified (predetermined) value (for example, 0.10 MPa) or more, and the pressure of the second bearing 5 and the first thrust bearing 6 is a specified (predetermined) value (for example, 0.10 MPa) or more. In some cases, the pressure of the lubricating oil between the first bearing 4, the second bearing 5, and the first thrust bearing 6 exceeds a specified (predetermined) value, so that the closing plate on the first bearing 4 side after the opening inspection is completed. Since the replacement work from 28 to the first bearing oil supply orifice 8 and the replacement work from the closing plate 29 on the second bearing 5 and first thrust bearing 6 side to the second bearing oil supply orifice 9 are performed, the turning operation is performed. Will be done.

<In the case of a power plant not provided with a jacking oil pump 11>
The power plant described above is the case of a power plant provided with the jacking oil pump 11, but when the scale of the power plant is small, the jacking oil pump is not provided.
In this case, in the present embodiment, the jacking oil pump 11 shown in FIG. 1 and the lubricating oil supply line by the jacking oil pump 11 are eliminated.
Further, since there is no jacking oil pump 11, permission to start the jacking oil pump 11 shown in FIG. 4 is not performed, and the closing plates 28 and 29 and the orifices (8, 9) in the turning operation start permission logic of FIG. The present invention is similar to the case of the power plant provided with the jacking oil pump 11 of the above-described embodiment by eliminating the condition that the pressure at the outlet of the jacking oil pump 11 at the start after the replacement work is less than a prescribed (predetermined) value. Is applicable.
That is, in a power plant with a large power generation scale, a jacking oil pump that supplies jacking oil to the bearing, and a control device that performs turning activation control using the pressure value detected by the pressure detector at the outlet of the jacking oil pump; It becomes the composition which has.

<Effect>
According to the above configuration, the oil pump with a lubricating oil tank is constituted by the gas turbine 1, the generator 17, the high-pressure / medium / low-pressure steam turbines 3, 2, etc. In the combined cycle power plant to which lubricating oil is supplied from the main oil pump 10, the main oil oil pump 10 is temporarily stopped when the gas turbine 1 is inspected for opening, and the first bearing 4 as shown in FIG. The first and second bearing oil supply orifices 8 and 9 on the side, second bearing 5 and first thrust bearing 6 side are replaced with closing plates 28 and 29, respectively. Then, the operation of the main oil pump 10 is started, and the lubricating oil supplied from the main oil pump 10 is prevented from being supplied by the closing plates 28 and 29 replaced with the first and second bearing oil supply orifices 8 and 9. And not supplied to the bearings (4, 5, 6) of the gas turbine 1.

  As a result, the main oil pump 10 is operated and the high-pressure / medium-low pressure steam turbines 3, 2 do not wait until the casing metal temperature of the high-pressure / medium-low pressure steam turbines 3, 2 of the steam turbine reaches the temperature at which the oil pump can be stopped. The open inspection of the gas turbine 1 can be performed while cooling. In this way, the main oil is supplied to the bearings (2a, 2b, 2s, 3a) of the high pressure / medium / low pressure steam turbines 3 and 2 until the casing metal temperature of the high pressure / medium / low pressure steam turbines 3 and 2 reaches a temperature at which the oil pump can be stopped. Since the oil pump 10 continues to supply the lubricating oil, the open inspection of the gas turbine 1 can be performed quickly and efficiently.

That is, by replacing the orifices (8, 9) installed in the pipes 8A, 8B, 9A, 9B for supplying the lubricating oil to the gas turbine 1 with the closing plates 28, 29, the high-pressure / medium-low pressure steam turbine 3 Even if the temperature of the casing 2 metal does not reach the temperature at which the oil pump can be stopped, the lubricating oil is prevented from flowing into the gas turbine 1 by the closing plates 28 and 29 and lubricated to the high-pressure / medium-low pressure steam turbines 3 and 2. The opening inspection of the gas turbine 1 can be efficiently performed while supplying oil.
Therefore, in a combined cycle power generation facility composed of a gas turbine, a generator, high-pressure / medium-low pressure steam turbines 3 and 2, the efficiency of open inspection of the gas turbine can be improved without using a steam turbine forced cooling device. Cost reduction when performing open inspection of the turbine 1 can be achieved.

In the above-described embodiment, the case where two steam turbines of medium and low pressure / high pressure steam turbines 2 and 3 are illustrated as the steam turbine, but the present invention can also be applied to a case where one steam turbine is provided. Of course, the number of steam turbines is not limited to the application of the invention.
Moreover, in the said embodiment, the structure which replaces the 1st, 2nd bearing oil supply orifices 8 and 9 and the closing plates 28 and 29 is the 1st and 2nd orifice which has the 1st and 2nd bearing oil supply orifices 8 and 9. Although the members 18 and 19 or the closing plates 28 and 29 are slid onto the pipe and screwed to the pipes 8A, 8B, 9A and 9B with the bolts b and nuts, the first and second orifice members 18 and 19 are exemplified. And the closing plates 28 and 29 are rotatably provided in the pipe, and the first and second bearings are rotated by rotating the first and second bearing oil supply orifices 8 and 9 and the closing plates 28 and 29 with respect to the pipe, respectively. The oil supply orifices 8 and 9 and the closing plates 28 and 29 may be exchanged. According to this configuration, the replacement operation between the first and second bearing oil supply orifices 8 and 9 and the closing plates 28 and 29 can be performed by a rotating operation, so that the replacement operation is smooth and easy.

Moreover, in the said embodiment, although the closing plates 28 and 29 were illustrated as a closing member which stops supply of the lubricating oil to the 1st bearing 4, the 2nd bearing 5, and the 1st thrust bearing 6 of the gas turbine 1, The shape of the member is not particularly limited as long as the supply of the lubricating oil to the bearings (4, 5, 6) can be prevented.
In the above-described embodiment, the configuration in which the orifices (8, 9) and the closing plates 28, 29 are replaced is illustrated. However, the gas turbine 1 can be replaced without replacing the closing plates 28, 29 with the orifices (8, 9). In the opening inspection, the closing plates 28 and 29 may be arranged in the lubricating oil supply system to prevent the supply of the lubricating oil to the bearings (4, 5, 6) of the gas turbine 1.

Alternatively, if the closing plates 28 and 29 are arranged in the lubricating oil supply system during the opening inspection of the gas turbine 1 and supply of the lubricating oil to the bearings (4, 5, 6) of the gas turbine 1 can be prevented, the orifices (8, 9) may not be provided.
In the embodiment, the configuration in which the replacement from the closing plates 28 and 29 to the orifices (8, 9) after the opening inspection of the gas turbine 1 is detected by the pressure detectors 7A, 7B is exemplified. However, the pressure detector 7A 7B may be detected by other magnetic sensors, infrared sensors, or the like, and is not limited to the pressure detectors 7A and 7B. In the case of the pressure detectors 7A and 7B, the pressure of the lubricating oil is directly detected, which is most desirable.
Further, the start permission condition and the turning operation start permission condition of the jacking oil pump 11 exemplified in the above embodiment are merely examples, and it is needless to say that they can be appropriately set according to the specifications of the power plant.

1 Gas turbine 2 Medium to low pressure steam turbine (steam turbine)
2a Third bearing (steam turbine bearing)
2b Fourth bearing (steam turbine bearing)
2s Second thrust bearing (steam turbine bearing)
3 High-pressure steam turbine (steam turbine)
3a Fifth bearing (steam turbine bearing)
4 First bearing (gas turbine bearing)
5 Second bearing (gas turbine bearing)
6 First thrust bearing (gas turbine bearing)
7A Pressure detector (first pressure detector)
7B Pressure detector (first pressure detector)
8 First bearing oiling orifice (orifice)
9 Second bearing oil supply orifice (orifice)
10 Main oil pump (lubricant supply system)
10T Lubricating oil tank (lubricating oil supply system)
11 Jacking oil pump 14 Control device (first control device, second control device)
17 Generator 20 Pressure detector (second pressure detector)
21 Pressure detector (third pressure detector)
28 Closing plate (closing member)
29 Closing plate (closing member)
P Lubricating oil supply device for bearings (Lubricating oil supply device for bearings in power plants)

Claims (7)

A lubricating oil supply device for bearings of a combined cycle power plant comprising a gas turbine, a generator, and a steam turbine,
A lubricating oil supply system that supplies lubricating oil to bearings that support the turbine rotor of the gas turbine and the steam turbine;
A closure member for blocking the supply of lubricating oil to the lubricating oil supply is disposed to the system bearing of the gas turbine to the gas turbine bearings when performing overhaul of the gas turbine,
The lubricating oil supply system to the bearing of the gas turbine comprises an orifice provided in an exchangeable manner with the closing member,
When performing an open inspection of the gas turbine, the closing member is disposed in the lubricating oil supply system to the bearing of the gas turbine and prevents the supply of the lubricating oil, while the gas turbine is in operation, the gas A lubricating oil supply device for a bearing of a power plant , wherein the orifice is disposed in the lubricating oil supply system to a bearing of a turbine and the lubricating oil is supplied. In bearing lubricating oil supply device of the power plant of claim 1 Symbol placement,
A lubricating oil supply device for a bearing of a power plant, comprising a first pressure detector provided downstream of the location where the closing member is disposed and detecting the pressure of the lubricating oil on the downstream side. In the lubricating oil supply device for bearings of a power plant according to claim 2 ,
Supplying a lubricating oil for bearings of a power plant, comprising: a first control device that controls the gas turbine not to perform a turning operation when a pressure value detected by the first pressure detector is less than a predetermined value. apparatus. In the lubricating oil supply apparatus for bearings of a power plant according to claim 3 ,
A second pressure detector for detecting the pressure of the lubricating oil supplied by the lubricating oil supply system;
The first control device is configured such that the rotor rotational speed of the gas turbine is equal to or lower than a predetermined rotational speed, the pressure of the lubricating oil in the lubricating oil supply system is equal to or higher than a predetermined pressure, and the downstream of the location where the closing member is disposed. A lubricating oil supply device for a bearing of a power plant, wherein the gas turbine is turned when the pressure of the lubricating oil is equal to or higher than a predetermined pressure. In the lubricating oil supply device for bearings of a power plant according to claim 4 ,
A jacking oil pump for supplying the lubricating oil of the jacking oil to the bearing;
If the pressure value the pressure value detected by the first pressure detector detects less than a predetermined value or the second pressure detector is less than a predetermined value, the second controlled so as not to perform activation of the jacking oil pump A lubricating oil supply device for bearings of a power plant, comprising: a control device. In the lubricating oil supply device for bearings of a power plant according to claim 5 ,
The second control device is configured to provide the lubrication downstream of a location where the rotational speed of the gas turbine is equal to or lower than a predetermined rotational speed, the pressure of the lubricating oil in the lubricating oil supply system is equal to or higher than a predetermined pressure, and the closing member is disposed. A lubricating oil supply device for a bearing in a power plant, wherein the jacking oil pump is controlled to start when the oil pressure is equal to or higher than a predetermined pressure. In the lubricating oil supply device for bearings of a power plant according to claim 5 or 6 ,
A third pressure detector for detecting a pressure at the outlet of the jacking oil pump; and the first control device is configured so that a rotor rotational speed of the gas turbine is equal to or lower than a predetermined rotational speed, and a pressure at the outlet of the jacking oil pump When the pressure of the lubricating oil in the lubricating oil supply system is equal to or higher than the predetermined pressure and the pressure of the lubricating oil downstream of the location where the closing member is disposed is equal to or higher than the predetermined pressure. A lubricating oil supply device for bearings of a power plant characterized by performing a turning operation.

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