JP5063215B2 - Bearing cooling water system in power generation facilities - Google Patents

Description

  The present invention relates to a bearing cooling water system in power generation equipment, and is particularly useful when the cooling water of a unit bearing cooling water system is effectively used between power generation units.

  Some power generation facilities are composed of a plurality of power generation units such as No. 1 unit, No. 2 unit, and so on. Each power generation unit is provided with a bearing cooling water system for cooling a steam turbine, a generator, a control compressor, and the like.

  Here, the control compressor for operating the pneumatic circuit provided in each power generation unit controls the opening and closing of the pneumatic control valve of each device provided in the power generation unit by supplying control air. . As described above, the control compressor is also always cooled with the cooling water of the unit bearing cooling water system in order to prevent the control compressor from becoming high temperature, like the bearing portions of the respective devices. Patent Document 1 can be cited as a known technique related to this control compressor.

  FIG. 3 is a schematic system diagram showing a bearing cooling water system in a power generation facility according to the prior art provided with two power generation units. As shown in FIG. 3, the bearing cooling water system 3 in the power generation facility is composed of a No. 1 unit bearing cooling water system 1 and a No. 2 unit bearing cooling water system 2. 13, the first control compressor 12, and the bearing portion 23 and the second control compressor 22 of each unit of Unit 2 are cooled by circulation of cooling water pumped from the pumps 8 and 28. The first bearing cooling water pipe 14 is provided with a first isolation on-off valve 10, and the second bearing cooling water pipe 24 is provided with a second isolation on-off valve 20. Thus, the first control compressor 12 and the second control compressor 22 can be isolated from the bearing portion 13 of each device of the No. 1 unit and the bearing portion 23 of each device of the No. 2 unit.

  In the No. 1 unit bearing cooling water system 1, the cooling water is circulated in the first bearing cooling water pipe 14 by the pump 8, whereby the bearing portion 13 and the first control compressor 12 of each device of the No. 1 unit are To be cooled. The same applies to the No. 2 unit bearing cooling water system 2.

  Conventionally, when a periodic inspection is performed by stopping the bearing cooling water system in the power generation facility, the supply of cooling water for cooling the control compressor is also stopped. However, even if the bearing cooling water system stops, the control compressor needs to continue to operate because it needs to send control air to the pneumatic control valve or the like. As a result, since cooling water for cooling the control compressor is necessary, miscellaneous water outside the system is used as the cooling water, and a cooling water pipe for supplying cooling water has been temporarily installed. Furthermore, this miscellaneous water was discharged out of the system as it was after the control compressor was cooled.

  That is, as shown in FIG. 3, for example, when the No. 1 unit bearing cooling water system 1 is stopped and a periodic inspection is performed, the miscellaneous water cooling water pipe 15 from outside the system is newly added to the No. 1 unit bearing cooling water system 1. The first control compressor 12 was cooled temporarily. At that time, the first isolation on-off valve 10 of the first bearing cooling water pipe 14 is closed. The same applies when the No. 2 unit bearing cooling water system 2 is stopped.

  Therefore, in the conventional cooling method for the control compressor, a cooling water pipe for supplying cooling water must be temporarily installed in the control compressor every time the power generation unit is periodically inspected. Furthermore, a large amount of miscellaneous water was discharged outside the power generation system, which was very uneconomical.

JP-A-6-229546

  The present invention has been made in view of the above situation, and even when the unit bearing cooling water system of the power generation unit is stopped, cooling water for cooling the control compressor can be supplied without using cooling water outside the system. An object of the present invention is to provide a bearing cooling water system in a power generation facility.

In order to achieve the above object, the first aspect of the present invention provides:
Circulation and control the compressor for supplying the gas for controlling the plurality of power generating units with each generator includes a control compressor, wherein the bearing section of each apparatus in the power generation unit cooling water for cooling the respective A plurality of independent unit bearing cooling water systems,
A connecting pipe that connects the unit bearing cooling water systems of adjacent power generation units so that the cooling water of one unit bearing cooling water system can be supplied as the cooling water of the other unit bearing cooling water system;
A communication on-off valve arranged in the middle of the communication pipe to open and close the communication pipe ;
A stop signal indicating operation stop of the one unit bearing cooling water system is input, the connection on-off valve is opened, and cooling water can be supplied from the other unit bearing cooling water system to the one unit bearing cooling water system. The bearing cooling water system in the power generation facility is characterized by having control means for controlling the power supply.

In the first aspect, even when the unit bearing cooling water system of the power generation unit is stopped, cooling water is supplied from one operating unit bearing cooling water system to the other stopped unit bearing cooling water system through the connecting pipe. By introducing, the cooling water can be continuously supplied to the control compressor of the unit bearing cooling water system that is stopped. As a result, the cooling water can be used effectively.
Further, in this aspect, even when the unit bearing cooling water system of the power generation unit is stopped, the control of introducing the cooling water from one operating unit bearing cooling water system to the other stopped unit bearing cooling water system is performed. Automation can be achieved.

The second aspect of the present invention is:
In the bearing cooling water system in the power generation facility described in the first aspect,
Each unit bearing cooling water system is a bearing cooling water system in a power generation facility having an isolation on-off valve for isolating the control compressor from other devices.

In the 2nd mode, since the inside of the same unit bearing cooling water system can be separated by the isolation on-off valve, the cooling water can be flowed only to a necessary portion.

  The bearing cooling water system in the power generation facility of the present invention can cool the control compressor without using cooling water from outside the system even when the unit bearing cooling water system is stopped. Can contribute.

  FIG. 1 is a schematic system diagram of a bearing cooling water system in a power generation facility including two power generation units according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of each device of the bearing cooling water system.

  As shown in FIG. 1, the bearing cooling water system 3 in the power generation facility includes a bearing cooling water system of a No. 1 unit bearing cooling water system 1 and a No. 2 unit bearing cooling water system 2. In the No. 1 unit bearing cooling water system 1 and No. 2 unit bearing cooling water system 2, the bearing portion 13 of each device of the No. 1 unit which is a bearing portion of a steam turbine, a generator, etc. and the bearing portion of each device of the No. 2 unit 23, and the first control compressor 12 and the second control compressor 22 for sending control air are cooled with cooling water. In FIG. 1, each power generation unit of the bearing cooling water system 3 in the power generation facility is shown as a No. 1 unit bearing cooling water system 1 and a No. 2 unit bearing cooling water system 2 surrounded by dotted lines.

  The control compressor supplies control air for opening and closing a pneumatic control valve provided in each device or the like. This control compressor must be operated at all times, not only when the power generation equipment is in operation, but also when the unit bearing cooling water system is stopped during periodic inspections, etc. It needs to be cooled.

  Here, as shown in FIG. 2, for example, the bearing portion of each device to be cooled of the bearing portion 13 (FIG. 1) of each device of the No. 1 unit, the bearing portion 30 of each plant auxiliary machine, the boiler feed pump An oil cooler 31, a hydrogen cooler 32 that cools the turbine generator, an AC exciter 33 that is a generator excitation device, a stator cooling device 34 that cools the stator of the AC exciter, a main turbine oil cooler 35, and the like. . The bearing unit 13 and the first control compressor 12 of each device of the No. 1 unit are connected in parallel, and the cooling water is circulated by the pump 8 so that the bearing unit and the control compressor of each device are cooled. .

  As shown in FIG. 1, in the No. 1 unit bearing cooling water system 1, a pump 8, a first control compressor 12, and a bearing portion 13 of each device of the No. 1 unit are connected in parallel, and a first isolation on-off valve The first bearing cooling water pipe 14 provided with 10 is connected.

  Similarly, in the No. 2 unit bearing cooling water system 2, the pump 28, the second control compressor 22, and the bearing unit 23 of each device of the No. 2 unit are connected in parallel, and the second isolation on-off valve 20 is provided. Two bearing cooling water pipes 24 are connected.

  For this reason, when the No. 1 unit bearing cooling water system 1 and the No. 2 unit bearing cooling water system 2 are respectively operated, the cooling water is circulated in the respective power generation units by the pumps 8 and 28, and the first unit bearing cooling water system 2 is operated. The control compressor 12 and the second control compressor 22 are cooled.

  On the other hand, when the unit bearing cooling water system is stopped for periodic inspection or the like, the supply of cooling water is also stopped. However, since the control compressor for supplying the control air must be operated at all times, the cooling water must be supplied to the control compressor.

  Therefore, as shown in FIG. 1, the control compressor is circulated by circulating the cooling water between the power generation units by connecting pipes 4A and 4B connecting the No. 1 unit bearing cooling water system 1 and the No. 2 unit bearing cooling water system 2. Supply cooling water for cooling. The communication line 4A is provided with a first communication on-off valve 5, and the communication line 4B is provided with a second communication on-off valve 6. The first communication on-off valve 5 and the second communication on-off valve 6 are provided. The on-off valve 6 is connected to a communication on-off valve controller 7. However, the first communication on / off valve 5 and the second communication on / off valve 6 are closed when both the No. 1 unit bearing cooling water system 1 and the No. 2 unit bearing cooling water system 2 are operating. It has been.

  For this reason, when the No. 1 unit bearing cooling water system 1 is regularly inspected and the cooling water of the No. 1 unit stops, the cooling water circulating through the No. 2 unit bearing cooling water system 2 passes through the connecting pipe line 4A. Since it is introduced, the first control compressor 12 is cooled. The flow rate of the cooling water is adjusted by the first contact opening / closing valve 5 by the opening adjustment signal sent from the contact opening / closing valve control device 7. Then, the cooling water after cooling the first control compressor 12 is cooled by the second connection on / off valve 6 by the opening adjustment signal sent from the communication on / off valve control device 7 through the communication pipe 4B. The flow rate of water is adjusted and circulated to the No. 2 unit bearing cooling water system 2. The same applies when the No. 2 unit bearing cooling water system 2 is under periodic inspection.

  Therefore, it is not necessary to install a new cooling water pipe for supplying cooling water outside the system for each periodic inspection, and the cooling water can be circulated between the power generation units. The cooling water of the cooling water system 3 can be used effectively.

  In the bearing cooling water system 3 in the power generation facility according to the above-described embodiment, the case of the bearing cooling water system 3 in the power generation facility including two power generation units is taken as an example, but the number of power generation units is three or more. You may have. And, as in the above embodiment, by installing a shared pipeline and a connecting on / off valve between power generation units provided in a plurality of power generation facilities, the power generation unit is regularly inspected and the supply of cooling water is stopped. Even if it is, the cooling water of other unit bearing cooling water systems can be shared and used as cooling water for the control compressor. As a result, no cooling water from outside the system is required, and the cooling water can be circulated in the bearing cooling water system in the power generation equipment and used as many times as the cooling water for the control compressor. Can contribute.

  INDUSTRIAL APPLICABILITY The present invention can be used in an industrial field where cooling water in power generation equipment is shared between power generation units.

1 is a schematic system diagram of a bearing cooling water system in a power generation facility including two power generation units according to an embodiment of the present invention. It is the schematic of each apparatus of a bearing cooling water system. It is a schematic system diagram which shows the bearing cooling water system | strain in the power generation equipment which concerns on the prior art provided with two power generation units.

Explanation of symbols

1 Unit 1 bearing cooling water system 2 Unit 2 bearing cooling water system 3 Bearing cooling water system 4A connection pipeline 4B connection pipeline 5 first communication on-off valve 6 second communication on-off valve 7 On-off valve control device 8 Pump 10 First isolation on-off valve 12 First control compressor 13 Bearing portion 14 of each unit of unit 1 First bearing cooling water pipe 20 Second isolation on-off valve 22 Second Control compressor 23 No. 2 unit bearing part 24 second bearing cooling water pipe 28 pump

Claims (2)

Circulation and control the compressor for supplying the gas for controlling the plurality of power generating units with each generator includes a control compressor, wherein the bearing section of each apparatus in the power generation unit cooling water for cooling the respective A plurality of independent unit bearing cooling water systems,
A connecting pipe that connects the unit bearing cooling water systems of adjacent power generation units so that the cooling water of one unit bearing cooling water system can be supplied as the cooling water of the other unit bearing cooling water system;
A communication on-off valve arranged in the middle of the communication pipe to open and close the communication pipe ;
A stop signal indicating operation stop of the one unit bearing cooling water system is input, the connection on-off valve is opened, and cooling water can be supplied from the other unit bearing cooling water system to the one unit bearing cooling water system. bearing cooling water system in the power plant, characterized in that a control means for controlling so. In the bearing cooling water system in the power generation facility according to claim 1 ,
Each unit bearing cooling water system has an isolation on-off valve for isolating the control compressor from other devices.

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