JP5042008B2 - Leakage inspection method for cooling water cooler in auxiliary equipment cooling device - Google Patents

Description

  [Technical Field] The present invention cools auxiliary cooling water circulating inside an auxiliary cooling device used for cooling heat generated in a steam turbine, a boiler, and a generator provided in a thermal power generation facility, and their peripheral facilities. The present invention relates to a leakage inspection method for a cooling water cooler in an auxiliary machine cooling device for detecting leakage of auxiliary machine cooling water from the cooling water cooler.

  In a thermal power generation facility, the performance of the device is maintained by appropriately cooling the heat generated from various devices. Auxiliary equipment cooling device cools steam turbine bearing oil, motors for driving various pumps provided in boilers, generators, and hydrogen gas, which is a refrigerant thereof, using auxiliary equipment cooling water circulating inside. The heat transferred to the auxiliary machine cooling water is released into the seawater.

  An auxiliary machine, an auxiliary machine cooler for cooling the auxiliary machine, and an auxiliary machine cooling device including the auxiliary machine cooler will be described in detail. For example, a steam turbine bearing (an example of a turbine auxiliary machine) is driven by the combustion heat of fossil fuel. Heat is generated by heat from superheated high-pressure and high-temperature steam transmitted through the rotating shaft of the turbine, or by frictional heat generated by friction between the rotating shaft and the bearing as the rotating shaft of the turbine rotates. If it is left as it is, it will not be able to operate normally due to the seizure of the bearing. For this reason, the normal steam turbine is provided with a turbine bearing oil cooler (an example of an auxiliary machine cooler) that cools the steam turbine bearing through the lubricating oil of the steam turbine bearing.

  The turbine bearing oil cooler cools the steam turbine bearing lubricating oil and further the steam turbine bearing by exchanging heat between the turbine auxiliary machine coolant and the turbine bearing lubricating oil. The auxiliary machine cooling water heated by cooling the steam turbine bearing oil is cooled by releasing heat into the seawater in the cooling water cooler.

  In the auxiliary equipment cooling device, the auxiliary equipment is constantly cooled by cooling the auxiliary equipment with the auxiliary equipment cooling water in the auxiliary equipment cooler, circulating the auxiliary equipment cooling water in the auxiliary equipment cooling equipment, and cooling the auxiliary equipment cooling water with seawater. Cooling.

  The cooling water cooler has a cooling chamber for injecting seawater and exchanging heat between the auxiliary machine cooling water and the seawater, and a heat exchange thin tube for circulating the auxiliary machine cooling water. However, when a crack or the like occurs in the heat exchange thin tube, the auxiliary machine coolant leaks into the seawater due to the difference in water pressure between the auxiliary machine coolant and the seawater. Leakage of auxiliary machine cooling water causes problems such as a decrease in auxiliary machine cooling capacity due to a decrease in auxiliary machine cooling water. Furthermore, if the leakage is left unattended, it becomes difficult to cool the auxiliary machine, and the operation of the thermal power generation facility itself becomes difficult. May be difficult. For this reason, a leakage inspection method for a cooling water cooler in an auxiliary machine cooling device for detecting leakage of auxiliary machine cooling water has been desired.

  For example, Patent Document 1 discloses a load-side loop that accommodates reactor auxiliary equipment, a primary cooling system that exchanges heat with the load-side loop and has a lower system pressure than the load-side loop, and heat exchange with the primary cooling system. A secondary cooling system having a lower system pressure than the primary cooling system, a tank connected to the primary cooling system for supplying coolant to the primary cooling system, and a coolant connected to the tank for supplying coolant to the tank. A coolant replenishment system, a coolant change amount detection mechanism for detecting a change amount of the coolant amount in the tank, an arithmetic circuit for processing a detection signal of the coolant change amount detection mechanism to determine whether there is a leak, and An auxiliary equipment cooling device for a nuclear reactor is disclosed that includes a display mechanism for displaying a calculation result of an arithmetic circuit.

According to this reactor auxiliary equipment cooling device, not only early detection of coolant leakage but also leakage identification can be performed, thereby enabling early processing, for example, from the load side loop containing the reactor auxiliary equipment. When coolant leaks into the secondary cooling system, it is possible to minimize accidents in which radioactive radioactive material leaks to the primary side, then leaks to the primary side and flows out to the secondary side. It is said that safety can be greatly improved. In addition, since the presence or absence of leakage is determined from the amount of change in the coolant in the tank connected to the primary cooling system, whether leakage has occurred in the load side loop, or the primary cooling system or the secondary cooling system It is possible to identify whether or not a leak has occurred and to perform leak detection with extremely high accuracy.
Japanese Patent Publication No.59-009595

  However, in the auxiliary machine cooling device described in Patent Document 1, in order to implement the coolant leakage inspection method, a new facility such as a coolant change amount detection mechanism is required. A complicated arithmetic circuit for processing the detection signal is also required. Moreover, since the auxiliary machine cooling apparatus described in Patent Document 1 is an auxiliary machine cooling apparatus in a nuclear power generation facility, it cannot be directly applied to an auxiliary machine cooling apparatus in a thermal power generation facility.

  The present invention has been made in view of the above-described problems, and is a cooling water cooler leakage inspection method for cooling auxiliary water cooling water in an auxiliary equipment cooling device for a thermal power generation facility. It is an object of the present invention to provide a leakage inspection method for a cooling water cooler in an auxiliary equipment cooling device, which can be carried out easily without requiring a large capital investment.

  The present inventors provide a cooling water cooler for cooling auxiliary water cooling water with seawater in an auxiliary equipment cooling device provided in a thermal power generation facility. By measuring the specific gravity of the seawater, it was found that leakage of auxiliary cooling water can be easily detected, and the present invention has been completed.

  Specifically, the present invention provides the following.

  (1) In a thermal power generation facility, a steam turbine, a boiler, a generator, and a cooling water circulation path for circulating auxiliary machine cooling water that cools heat generated in the peripheral equipment, and the cooling water circulation path are provided. An auxiliary machine cooler for cooling a heat generating part of a steam turbine, a boiler, or a generator, or peripheral equipment thereof, and the cooling water circulation path, for cooling the auxiliary machine cooling water with seawater. A first cooling water cooler; and a first seawater inflow path for allowing seawater to flow into the first cooling water cooler, and a first cooling water cooler. A first seawater discharge path for discharging seawater from the first cooling water cooler; a first heat exchange capillary for circulating auxiliary cooling water in the first cooling water cooler; Provided on one seawater inflow route And a first seawater discharge path valve provided on the first seawater discharge path, wherein the auxiliary cooling water leaks from the first cooling water cooler. A method for inspecting a leakage of a cooling water cooler in an auxiliary equipment cooling device to be detected, the first step of circulating auxiliary equipment cooling water to the cooling water circulation path, the first seawater inflow path valve, and the The first heat exchange is performed by performing a second step of closing the first seawater discharge path valve and a third step of measuring a change in the specific gravity of the seawater inside the first cooling water cooler. Leakage inspection method for a cooling water cooler in an auxiliary equipment cooling device for detecting leakage of auxiliary equipment cooling water from a thin tube for use.

  According to the invention described in (1), since the auxiliary machine cooling water is circulated through the cooling water circulation path during the auxiliary machine cooling water leakage inspection, the auxiliary machine cooling water leaking from the first heat exchange narrow tube is detected. Therefore, it is possible to easily detect the leakage of the auxiliary machine cooling device. In addition, the first seawater inflow path valve and the first seawater discharge path valve are closed to shut off the inflow and discharge of seawater to the first cooling water cooler, so that the change in specific gravity of seawater can be easily detected, Leakage of auxiliary machine coolant can be easily detected. Furthermore, since leakage inspection is performed by a relatively simple method of measuring the change in specific gravity, no new equipment investment is required, and no complicated data processing is required. For this reason, the invention described in (1) can be easily implemented in existing facilities.

  (2) The auxiliary machine cooling device is further arranged in parallel with the first cooling water cooler, and a second cooling water cooler for cooling the auxiliary machine cooling water with seawater, and the second cooling water cooling. A second seawater inflow path for allowing seawater to flow into the second cooling water cooler and a second cooling water cooler for discharging seawater from the second cooling water cooler. In the second cooling water cooler, in the second cooling water cooler, a second heat exchange narrow tube for circulating auxiliary cooling water, and a second sea water inflow route valve provided on the second sea water inflow route And a second seawater discharge path valve provided on the second seawater discharge path, and the leakage inspection method of the cooling water cooler in the auxiliary machine cooling device includes the steam turbine, the boiler, and the generator, and During operation of these peripheral facilities, the second seawater inflow path valve and the front By opening the second seawater discharge path valve and operating the second cooling water cooler, by performing the first step, the second step, the third step, A leakage inspection method for a cooling water cooler in an auxiliary machine cooling device according to (1), wherein leakage of auxiliary machine cooling water from the first heat exchange thin tube is detected.

  According to the invention described in (2), since the second cooling water cooler arranged in parallel with the first cooling water cooler is provided, the steam turbine, the boiler, the generator, and their peripheral equipment Even during the operation, the cooling water cooler on one side is operated to cool the auxiliary cooling water only by the cooling water cooler, and the leakage inspection of the auxiliary cooling water from the other cooling water cooler is performed. Can be done. That is, the second seawater inflow passage valve and the second seawater discharge passage valve are opened, and the leakage of auxiliary coolant from the first cooling water cooler is inspected with the second cooling water cooler activated. By doing so, leakage of auxiliary machine coolant from the coolant cooler can be inspected even when the steam turbine, the boiler, the generator, and their peripheral equipment are in operation.

  (3) Next, in a state where the first seawater inflow route valve and the first seawater discharge route valve are opened and the first cooling water cooler is operated, the second seawater inflow route valve and the second seawater inflow route valve By closing the seawater discharge path valve and measuring the change in the specific gravity of the seawater inside the second cooling water cooler, leakage of auxiliary coolant from the second heat exchange capillary is detected (2) The leakage inspection method of the cooling water cooler in the auxiliary machine cooling device described in 1.

  The invention described in (3) inspects the leakage of the auxiliary cooling water from the second cooling water cooler after inspecting the leakage of the auxiliary cooling water from the first cooling water cooler. At this time, in order to open the first seawater inflow path valve and the first seawater discharge path valve and operate the first cooling water cooler, the steam turbine, the boiler, and the power generation, as in the invention described in (2) The leakage of the auxiliary cooling water from the second cooling water cooler can be inspected in a state where the machine and the peripheral equipment are operated.

  According to the present invention, since the auxiliary machine cooling water is circulated during the auxiliary machine cooling water leakage inspection, it is possible to easily detect the leakage of the auxiliary machine cooling water. Furthermore, since the seawater inflow path valve and the seawater discharge path valve are closed, the change in the specific gravity of the seawater inside the cooling water cooler can be easily detected, and the leakage of the auxiliary machine cooling water can be easily detected. . In addition, since leakage inspection is performed by a relatively simple method of measuring specific gravity, no new capital investment is required and no complicated data processing is required. For this reason, according to the present invention, it is possible to easily detect leakage of auxiliary machine coolant.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<Auxiliary equipment cooling device>
FIG. 1 shows an example of an auxiliary machine cooling apparatus 1 according to the present invention.

  The auxiliary machine cooling apparatus 1 according to the present invention includes a cooling water circulation path 18 for circulating auxiliary cooling water for cooling heat generated in a steam turbine, a boiler, a generator, and peripheral equipment in a thermal power generation facility. And a surge tank 22 for adjusting the pressure / flow rate of the auxiliary coolant supplied to the coolant circulation path 18, provided on the route branched from the coolant circulation path 18, and provided on the coolant circulation path 18. Auxiliary equipment coolers 13 and 14 for cooling a heat generating part of a steam turbine, a boiler, or a generator, or peripheral equipment thereof, and a cooling water circulation path 18 are provided to cool the auxiliary equipment cooling water with seawater. The 1st cooling water cooler 3 and the 2nd cooling water cooler 4 arrange | positioned in parallel with the 1st cooling water cooler 3 for cooling auxiliary machine cooling water with seawater are provided.

[Cooling water circulation path]
The cooling water circulation path 18 is a surge tank-cooling water cooler connection path 19 that connects the branch point from the cooling water circulation path 18 to the surge tank 22 and the first cooling water cooler 3 and the second cooling water cooler 4. A cooling water cooler-auxiliary cooler connection path 20 connecting the first cooling water cooler 3 and the second cooling water cooler 4 and the auxiliary machine coolers 13 and 14, and the auxiliary machine coolers 13 and 14; , An auxiliary machine cooler-surge tank connection path 21 connecting the branch point from the cooling water circulation path 18 to the surge tank 22.

  The surge tank-cooling water cooler connection path 19 is provided with the cooling water pump 2, and then the flow path branches to reach the first cooling water cooler 3 and the second cooling water cooler 4. To do. A three-way control valve (not shown) is provided at the branch point of the flow path, and controls the flow rate of the auxiliary coolant that reaches the first coolant cooler 3 and the second coolant cooler 4.

  In the cooling water cooler-auxiliary cooler connection path 20 that connects the first cooling water cooler 3, the second cooling water cooler 4, and the auxiliary machine coolers 13, 14, the first cooling water cooler 3 and the flow paths from the second cooling water cooler 4 once merge, and then further branch to reach the auxiliary machine cooler 13 and the auxiliary machine cooler 14, respectively. A differential pressure control valve 23 is provided on the cooling water cooler-auxiliary cooler connection path 20. With this differential pressure control valve 32, the pressure of the auxiliary cooling water flowing into the auxiliary machine coolers 13 and 14 can be adjusted to be higher than the pressure at the inlet of the cooling water pump 2, and the cooling water circulation path 18. The auxiliary machine cooling water can be circulated smoothly. In addition, in this embodiment, although two auxiliary machine coolers 13 and 14 are provided, it is not limited to such an aspect, and three or more may be provided.

  In the auxiliary machine cooler-surge tank connection path 21, the flow paths from the auxiliary machine coolers 13, 14 merge, and the merged flow path reaches the branch point to the surge tank 22 on the cooling water circulation path 18. . The surge tank 22 is open at the top and is a container capable of storing cooling water, and has a structure in which cooling water can flow in as the flow rate increases and the cooling water pressure increases. A condensate heat exchanger that performs heat exchange with the condensate is provided on the path of the auxiliary machine cooler-surge tank connection path 21 after the flow paths from the auxiliary machine coolers 13 and 14 merge. May be. Thereby, the heat conducted from the auxiliary machine to the auxiliary machine cooling water is recovered by the condensate, and the power generation efficiency can be improved.

[Auxiliary cooler]
The auxiliary machine coolers 13 and 14 are equipment for cooling the steam turbine and its peripheral equipment. Examples of such auxiliary machine coolers 13 and 14 include a bearing oil cooler, various pump drive motor coolers, a generator cooler, and a hydrogen cooler that cools hydrogen that is a refrigerant of the generator. it can.

  Further, these auxiliary machine coolers 13 and 14 will be described in detail by way of examples. For example, a turbine bearing oil cooler circulates turbine bearing oil and circulates inside the heat exchange thin tubes, thereby heat exchange thin tubes. Then, heat exchange is performed between the auxiliary machine coolant and the turbine bearing oil to cool the turbine bearing oil. The cooled turbine bearing oil reaches the turbine bearing, thereby cooling the turbine bearing.

[First cooling water cooler, second cooling water cooler]
The first cooling water cooler 3 includes a first seawater inflow path 5 for flowing seawater into the first cooling water cooler 3 and a first seawater discharge path for discharging seawater from the first cooling water cooler 3. 9, a first seawater inflow passage valve 7 provided on the first seawater inflow passage 5, a first seawater discharge passage valve 11 provided on the first seawater discharge passage 9, and the first cooling water cooler 3, A first heat exchange thin tube (not shown) for circulating auxiliary machine coolant. Similarly, the second cooling water cooler 4 includes a second seawater inflow path 6 for allowing seawater to flow into the second cooling water cooler 4 and a second seawater for discharging seawater from the second cooling water cooler 4. The discharge path 10, the second seawater inflow path valve 8 provided on the second seawater inflow path 6, the second seawater discharge path valve 12 provided on the second seawater discharge path 10, and the second cooling water cooler 4 And a second heat exchange thin tube (not shown) for circulating auxiliary machine coolant.

  In addition, in the auxiliary machine cooling device 1 according to the present invention, branching from the surge tank-cooling water cooler connection path 19 without passing through the first cooling water cooler 3 and the second cooling water cooler 4, A temperature adjustment path that joins the cooling water cooler-auxiliary cooler connection path 20 may be provided. In this case, a temperature adjustment valve is provided as necessary at the junction of the temperature adjustment path and the cooling water cooler-auxiliary cooler connection path 20 to connect the temperature adjustment path to the cooling water cooler-auxiliary cooler. By adjusting the flow rate of the auxiliary machine coolant flowing in from the path 20, the temperature of the auxiliary machine coolant flowing into the auxiliary machine coolers 13 and 14 can be controlled.

<Operation of auxiliary equipment cooling device>
Hereinafter, the operation of the auxiliary machine cooling apparatus 1 according to the present invention will be described. The auxiliary machine cooling water on the cooling water circulation path 18 is sent to the surge tank-cooling water cooler connection path 19 by the driving force of the cooling water pump 2, and the first cooling water cooler 3 and the second cooling water cooler. 4 flows in. In the first cooling water cooler 3 and the second cooling water cooler 4, the auxiliary cooling water circulates inside the first heat exchange thin tube and the second heat exchange thin tube, respectively, and the first seawater inflow path 5 and the seawater that flows in from the second seawater inflow path 6 are cooled by heat exchange. Seawater that has absorbed heat by exchanging heat with the auxiliary cooling water is discharged from the first seawater discharge path 9 and the second seawater discharge path 10, respectively.

  The auxiliary cooling water cooled in the first cooling water cooler 3 and the second cooling water cooler 4 is transferred to the auxiliary cooling devices 13 and 14 via the cooling water cooler-auxiliary cooler connection path 20. Inflow. In the auxiliary machine coolers 13 and 14, the auxiliary machine is cooled by auxiliary machine cooling water. As a method of cooling the auxiliary machine, a method of directly cooling the auxiliary machine with the auxiliary machine cooling water as in the auxiliary machine cooler 14 and a refrigerant circulating in the auxiliary machine cooler as in the auxiliary machine cooler 13 are used. The method of cooling with auxiliary machine cooling water can be mentioned.

  Auxiliary machine cooling water that has cooled the auxiliary machine by the auxiliary machine coolers 13 and 14 further reaches the branch point to the surge tank 22 on the cooling water circulation path 18 via the auxiliary machine cooler-surge tank connection path 21. To do.

  Here, the auxiliary machine cooling water that has absorbed heat generated from the auxiliary machine in the auxiliary machine coolers 13 and 14 may be cooled by the condensate flowing through the condensate heat exchanger. In this case, the condensate heat exchanger is provided on the auxiliary machine cooler-surge tank connection path. Thus, the heat absorbed by the auxiliary machine cooling water in the auxiliary machine coolers 13 and 14 is released into the condensate, so that the condensate is heated and the power generation efficiency can be increased. However, the auxiliary device cooling apparatus 1 of the present invention is not limited to the one provided with such a condensate heat exchanger as an essential facility. For example, the condensate heat exchanger is an auxiliary device cooler-surge tank. A surge tank 22 on the cooling water circulation path 18 is provided in one of the two flow paths branched on the connection path 21, and the auxiliary machine cooling water circulates inside the condensate heat exchanger by the flow path selection valve. It may be possible to select whether to reach the branch point to the surge tank 22 on the cooling water circulation path 18 without flowing through the condensate heat exchanger. Furthermore, the auxiliary machine cooling device 1 of the present invention may not include a condensate heat exchanger.

<Leakage inspection method for cooling water cooler in auxiliary equipment cooling device>
The method for inspecting the leakage of the cooling water cooler in the auxiliary equipment cooling device 1 of the present invention includes the first step of circulating auxiliary equipment cooling water to the cooling water circulation path 18, the first seawater inflow path valve 7 and the first seawater discharge path. By performing the second step of closing the valve 11 and the third step of measuring the change in the specific gravity of the seawater inside the first cooling water cooler 3, the first heat exchange capillary tube This is a leakage inspection method for a cooling water cooler in the auxiliary machine cooling device 1 for detecting leakage of auxiliary machine cooling water.

[First step]
In the first step, the auxiliary machine coolant is circulated through the coolant circulation path 18 by the driving force of the coolant pump 2. In this state, it is possible to easily inspect the leakage of the auxiliary cooling water by detecting the auxiliary cooling water leaking from the first heat exchange thin tube. The water pressure when driving the cooling water pump 2 is preferably 40 Mpa or more and 70 Mpa or less. Since the amount of leakage per unit time of auxiliary machine cooling water increases by being 40 Mpa or more, it becomes easy to detect leakage of auxiliary machine cooling water. By being 70 Mpa or less, it is possible to safely carry out the cooling water cooler leakage inspection method in the auxiliary machine cooling device 1 without overloading the cooling water circulation path 18 and various facilities on the cooling water circulation path 18. it can.

  The time for circulating the auxiliary machine cooling water to the cooling water circulation path 18 is that after the first seawater inflow path valve 7 and the second seawater discharge path valve 12 are closed, the inside of the first cooling water cooler 3 leaks with seawater. It is preferable to carry out within the range of the normal time required to be filled with the auxiliary cooling water. Thereby, not only the specification of the leakage but also the measurement of the leakage amount can be performed. The normal time required for the interior of the first cooling water cooler 3 to be filled with seawater and leaked auxiliary machine cooling water is generally 2 hours or more and 3 hours or less. For this reason, in this embodiment, it is preferable to circulate auxiliary machine cooling water to the cooling water circulation path 18 in the range of 2 hours or more and 3 hours or less. By being 2 hours or more, the absolute amount of leakage of auxiliary machine coolant that leaks can be increased, and leakage can be easily detected. By being 3 hours or less, the operation of the auxiliary machine cooling device 1 is not affected. In carrying out the leakage inspection method for the cooling water cooler of the present invention, it is preferable to open necessary valves such as a blow valve so that the pressure inside the first cooling water cooler 3 does not increase. Thereby, seawater can be prevented from flowing into the cooling water circulation path 18.

  Further, the leakage inspection method for the cooling water cooler according to the present invention performs the first step, and performs a step that replaces the second step and the third step to be described later. Leakage may be detected. For example, the leakage of the auxiliary coolant may be detected from the change in the amount of auxiliary coolant supplied to the surge tank 22. However, when specifying the leak location of the auxiliary coolant in the first coolant cooler 3, it is preferable to perform the second step and the third step described later.

[Second step]
In the second step, seawater inflow and discharge are shut off by closing the first seawater inflow path valve 7 and the first seawater discharge path valve 11. As a result, seawater does not flow in or out during the inspection method implementation time, so if the auxiliary cooling water leaks from the first heat exchange capillary, the leaked auxiliary cooling water The seawater is diluted by the above, and the leakage of the auxiliary machine cooling water can be detected by the third step to be performed later.

[Third step]
In the third step, the leakage of the auxiliary cooling water is detected by measuring the specific gravity of the seawater inside the first cooling water cooler 3. As described above, when the auxiliary machine cooling water is leaking from the first heat exchange thin tube, the seawater inside the first cooling water cooler 3 is diluted, so the change in the specific gravity of the seawater is measured. This makes it possible to detect leakage of auxiliary machine coolant.

  Although it does not specifically limit as a method of measuring the change of the specific gravity of the seawater inside the 1st cooling water cooler 3, The measurement of the specific gravity of the seawater with a commercially available hydrometer can be mention | raise | lifted. Further, in the third step, instead of measuring the specific gravity, a technique that can detect dilution of seawater by auxiliary cooling water, such as measurement of salinity concentration, measurement of dielectric constant, and measurement of pH, may be implemented. .

  The specific gravity measurement in the third step does not require a special detector or equipment, and can be easily performed by using a commercially available hydrometer. For this reason, the leakage inspection method of the cooling water cooler in the auxiliary machine cooling device 1 of the present invention does not require capital investment for its implementation and can be easily implemented. Furthermore, in the evaluation of the inspection data, no complicated calculation or the like is required, and it can be performed by any number of people.

<Steam Turbine, Boiler, Generator, and Cooling Water Cooler Leakage Inspection Method in Auxiliary Equipment Cooling Device 1 Implemented During Operation of Peripheral Equipment>
The leakage inspection method for the cooling water cooler in the auxiliary device cooling apparatus 1 of the present invention can be performed even during operation of the steam turbine, the boiler, the generator, and the peripheral equipment thereof. That is, even during operation of these facilities, the second seawater inflow passage valve 8 and the second seawater discharge passage valve 12 are opened, the second cooling water cooler 4 is operated, and the auxiliary machine cooling water is operated. By performing the first step, the second step, and the third step with cooling performed only by the second cooling water cooler 4, auxiliary cooling water from the first heat exchange capillary tube is performed. Leakage can be detected.

  The second cooling water cooler 4 is operated, and the first process, the second process, and the third process are performed in a state where the auxiliary machine cooling water is cooled only by the second cooling water cooler 4. Therefore, it is not necessary to stop the operation of the steam turbine, the boiler, the generator, and their peripheral equipment in order to carry out the leakage inspection method for the cooling water cooler in the auxiliary equipment cooling device 1 of the present invention. For this reason, it is not necessary to stop the operation of the thermal power generation facility, and economic loss can be minimized.

  In addition, when the leakage inspection method of the cooling water cooler in the auxiliary equipment cooling device 1 is performed during the operation of the steam turbine, the boiler, the generator, and the peripheral equipment, the auxiliary equipment cooling water is supplied to the cooling water circulation path 18. The water pressure at the time of circulation is limited to the water pressure at the time of circulating the auxiliary machine cooling water during the normal operation of the auxiliary machine cooling device 1.

  After inspecting the leakage of auxiliary cooling water from the first cooling water cooler 3, the leakage of auxiliary cooling water from the second cooling water cooler 4 can be inspected. That is, in this case, the first seawater inflow passage valve 7 and the first seawater discharge passage valve 11 are opened and the first cooling water cooler 3 is operated, and the second seawater inflow passage valve 8 and the second seawater inflow passage valve 8 are operated. The leakage of the auxiliary coolant from the second heat exchange thin tube may be detected by closing the seawater discharge path valve 12 and measuring the change in the specific gravity of the seawater inside the second coolant cooler 4. At this time, the matters to be noted are the same as the inspection of leakage of auxiliary coolant from the first coolant cooler 3.

It is a figure which shows the auxiliary machine cooling device of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Auxiliary machine cooling device 2 Cooling water pump 3 1st cooling water cooler 4 2nd cooling water cooler 5 1st seawater inflow path 6 2nd seawater inflow path 7 1st seawater inflow path valve 8 2nd seawater inflow path valve 9 First seawater discharge path 10 Second seawater discharge path 11 First seawater discharge path valve 12 First seawater discharge path valve 13 Auxiliary cooler 14 Auxiliary cooler 15 Condensate heat exchanger 16 Channel selection valve 17 Channel selection Valve 18 Cooling water circulation path 19 Surge tank-cooling water cooler connecting path 20 Cooling water cooler-auxiliary cooler connecting path 21 Auxiliary cooler-surge tank connecting path 22 Surge tank 23 Differential pressure control valve

Claims (3)

In the thermal power generation equipment, a steam turbine, a boiler, a generator, and a cooling water circulation path for circulating auxiliary machine cooling water that cools heat generated in the peripheral equipment,
An auxiliary machine cooler provided on the cooling water circulation path, for cooling a heat generator of a steam turbine, a boiler, or a generator, or peripheral equipment thereof;
A first cooling water cooler provided on the cooling water circulation path for cooling the auxiliary cooling water with seawater;
Provided in the first cooling water cooler, and a first seawater inflow path for flowing seawater into the first cooling water cooler;
A first seawater discharge path provided in the first cooling water cooler, for discharging seawater from the first cooling water cooler;
In the first cooling water cooler, a first heat exchange thin tube for circulating auxiliary machine cooling water,
A first seawater inflow path valve provided on the first seawater inflow path;
An auxiliary machine cooling device provided with a first seawater discharge path valve provided on the first seawater discharge path, wherein auxiliary machine cooling is performed to detect leakage of auxiliary machine coolant from the first cooling water cooler. A cooling water cooler leakage inspection method in the apparatus,
A first step of circulating auxiliary machine cooling water in the cooling water circulation path;
A second step of closing the first seawater inflow path valve and the first seawater discharge path valve;
A third step of measuring a change in specific gravity of seawater inside the first cooling water cooler, and
At least during the period from the second step to the third step, the pressure of the auxiliary coolant in the cooling water circulation path exceeds the pressure of seawater in the first cooling water cooler. Cooling water cooling in an auxiliary equipment cooling device that is controlled and detects leakage of auxiliary equipment cooling water from the first heat exchange use narrow pipe by diluting seawater by performing the third step. For leak inspection. The auxiliary machine cooling device further includes:
A second cooling water cooler disposed in parallel with the first cooling water cooler for cooling the auxiliary cooling water with seawater;
Provided in the second cooling water cooler, and a second seawater inflow path for allowing seawater to flow into the second cooling water cooler;
Provided in the second cooling water cooler, and a second seawater discharge path for discharging seawater from the second cooling water cooler;
In the second cooling water cooler, a second heat exchange thin tube for circulating auxiliary machine cooling water,
A second seawater inflow path valve provided on the second seawater inflow path;
A second seawater discharge path valve provided on the second seawater discharge path,
The leakage inspection method of the cooling water cooler in the auxiliary machine cooling device is as follows:
During the operation of the steam turbine, boiler, generator, and peripheral equipment thereof, the second seawater inflow passage valve and the second seawater discharge passage valve are opened to operate the second cooling water cooler. 2. The leakage of auxiliary coolant from the first heat exchange capillary is detected by performing the first step, the second step, and the third step in a state where Method for inspecting leakage of cooling water cooler in auxiliary equipment cooling device. Next, in a state where the first seawater inflow path valve and the first seawater discharge path valve are opened and the first cooling water cooler is operated,
Closing the second seawater inflow route valve and the second seawater discharge route valve;
The cooling in the auxiliary equipment cooling device according to claim 2, wherein leakage of auxiliary equipment cooling water from the second heat exchange thin tube is detected by measuring a change in specific gravity of seawater inside the second cooling water cooler. Water cooler leak inspection method.

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