JP2011237150A - Bearing cooling-water cooler system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing cooling-water cooler system capable of keeping a cooling function of a bearing cooling-water cooler for a long period.SOLUTION: This bearing cooling-water cooler system 1 for cooling bearing cooling water with seawater, includes: a bearing cooling-water cooler 10 including a seawater inlet section, a bearing cooing-water chamber receiving a cooling pipe in which the seawater of the seawater inlet section passes, a seawater outlet section for discharging the seawater passing through the cooing pipe, a bearing cooling-water inlet section for introducing the bearing cooling-water to a cooling section, and a bearing cooling-water outlet section for discharging the bearing cooling-water of the bearing cooling-water chamber; a first flow channel for introducing the seawater from the seawater inlet section and discharging the same from the seawater outlet section; a second flow channel for introducing the seawater from the seawater outlet section and discharging the same from the seawater inlet section; and an information processing device for controlling opening/closing of a first on-off valve 2, a second on-off valve 3, a third on-off valve 4 and a fourth on-off valve 5. The information processing device controls the opening and closing of the on-off valves 2-5 to alternately switch the first flow channel and the second flow channel, when it is determined that heat exchange efficiency by the bearing cooling-water cooler 10 is degraded.

Description

  The present invention relates to a shaft cooling water cooler system for cooling bearing cooling water or the like of auxiliary machinery used in a power plant with seawater.

  In a power plant, cooling of bearing cooling water of an auxiliary machine (hereinafter referred to as axial cold water) is performed using an axial cold water cooler. The axial cold water cooler is provided with a large number of cooling pipes therein, and seawater is passed through the cooling pipes. Then, the axial cold water is passed through the axial cold water cooler, and the cooling pipe is immersed in the axial cold water, whereby the axial cold water is cooled and discharged from the axial cold water cooler.

  FIG. 6 is a block diagram showing a conventional axial chilled water cooler system. The axial chilled water cooler 100, an introduction pipe 106 for introducing seawater into the axial chilled water cooler 100, and an inlet pipe 106 provided to open and close the first pipe 6. A seawater inlet valve 102, a discharge pipe 108 that discharges seawater introduced into the axial cold water cooler 100, and a seawater outlet valve 104 that is provided in the discharge pipe 108 and opens and closes the discharge pipe 108 are provided. When the axial cold water is cooled, the seawater inlet valve 102 and the seawater outlet valve 104 are opened to allow seawater to pass through the axial cold water cooler 100. The axial cold water used for cooling the cooling target 200 is heated through the axial cold water cooler 100. Thereby, axial cold water is cooled by seawater and is used again for cooling the cooling target 200. Seawater heated by heat exchange with the axial cold water is discharged to the outside (sea) through the seawater outlet valve 104 and the discharge pipe 108.

  In the conventional axial chilled water cooler system, heat exchange efficiency between seawater and axial chilled water in the axial chilled water cooler deteriorates due to contamination of the axial chilled water cooler or blockage of the cooling pipe, etc. There is. For this reason, it is necessary to stop the introduction of shaft cold water or seawater and clean the inside of the shaft cold water cooler. Cleaning the inside of a shaft cold water cooler has conventionally been laborious and time consuming because it is performed manually by opening the manhole.

  As a technique related to cleaning of the axial cold water cooler, there is a technique described in Patent Document 1 conventionally. According to Patent Document 1, it has been proposed to remove dust in the cooling pipe by introducing seawater from the reverse direction into the cooling pipe of the axial cold water cooler and performing backwashing.

JP 2009-293843 A

  Usually, before introducing seawater into the shaft cold water cooler, the seawater is passed through a filter to remove foreign matters such as dust and shells and then introduced into the shaft cold water cooler. Here, foreign matters larger than the filter are collected by the filter, but for example, shellfish larvae may pass through the filter and move into the axial cold water cooler. There is no problem if the larvae of the shellfish move into the axial cold water cooler and are discharged from the seawater outlet as they are, but if they remain in the axial cold water cooler, they grow on the spot and clog the cooling pipe. There is a risk of obstructing the flow of seawater in the cooling pipe. In particular, foreign matter tends to remain in the vicinity of the inlet of the cooling pipe, so that shellfish larvae may remain behind the foreign matter.

  In this case, by increasing the number of times of backwashing, it is possible to remove shellfish larvae along with foreign matter near the inlet of the cooling pipe. However, in the technique described in Patent Document 1, the amount of seawater flowing through the cooling pipe is reduced while the axial cold water cooler is backwashed. For this reason, frequent backwashing may reduce the cooling time of the axial cold water. Therefore, it is desired that an axial cold water cooler system that can maintain the cooling function of the axial cold water cooler for a long time after cleaning the axial cold water cooler once is desired.

  An object of the present invention is to solve such problems and to provide an axial cold water cooler system capable of maintaining the cooling function of the axial cold water cooler for a long period of time.

  In order to achieve the above object, the present invention has the following configuration.

  (1) In a shaft chilled water cooler system that cools bearing cooling water with seawater, a first pipe whose one end is connected to a seawater inlet that introduces seawater, and a seawater inlet that is connected to the other end of the first pipe A cooling unit that houses a cooling pipe that passes seawater at the seawater inlet, a seawater outlet that discharges seawater that has passed through the cooling pipe, a shaft cold water inlet that introduces bearing cooling water into the cooling unit, and the cooling A shaft chilled water cooler having a shaft chilled water outlet for discharging the bearing cooling water in the unit, a second pipe having one end connected to the seawater inlet for introducing seawater and the other end connected to the seawater outlet, A third pipe having one end connected to the seawater outlet and having the other end connected to a seawater outlet for discharging seawater; a seawater outlet to which one end is connected to the seawater inlet and discharges seawater; A fourth pipe to which the other end is connected, and the first pipe; A first on-off valve provided to open and close the first pipe; a second on-off valve provided to the second pipe for opening and closing the second pipe; and the third pipe provided to the third pipe. A third on-off valve that opens and closes, a fourth on-off valve that is provided in the fourth pipe and opens and closes the fourth pipe, the first on-off valve, the second on-off valve, the third on-off valve, and the fourth on-off valve Control means for performing opening / closing control of the valve, and the control means opens the first on-off valve and the third on-off valve when it is determined that the heat exchange efficiency in the shaft cold water cooler has decreased, and A first flow path for closing the second on-off valve and the fourth on-off valve to move the seawater in the cooling pipe in a direction from the seawater inlet to the seawater outlet, the second on-off valve, and the second 4 Open the on-off valve and close the first on-off valve and the third on-off valve, An axial chilled water cooler system that alternately switches a second flow path that moves seawater in the cooling pipe in a direction from the seawater outlet to the seawater inlet.

  According to (1), in the state where the seawater in the cooling pipe is moving in the direction (first flow path) from the seawater inlet to the seawater outlet, the heat exchange efficiency by the axial chilled water cooler is reduced. If it is determined, the flow of seawater in the cooling pipe is reversed (second flow path) and the state is continued. In addition, when it is determined that the heat exchange efficiency by the axial chilled water cooler has decreased in a state where the flow of seawater in the cooling pipe is reversed (second flow path), the flow of seawater in the cooling pipe is returned (first flow). Road), continue that state. This makes it possible to remove the foreign matter at the seawater inlet or seawater outlet that caused the heat exchange efficiency to decrease, and then lengthen the period until the shaft cold water cooler is fully cleaned. it can. In addition, since the state in which seawater is circulating in the cooling pipe in the axial cold water cooler is continued, the cooling function of the axial cold water cooler can be maintained for a long period of time.

  (2) In (1), a first thermometer that measures the temperature of the bearing cooling water introduced into the shaft cold water inlet portion, and a second thermometer that measures the temperature of the bearing cooling water discharged from the shaft cold water outlet portion. A thermometer, and the control means has a reduced heat exchange efficiency when the difference between the temperature measured by the first thermometer and the temperature measured by the second thermometer is smaller than a preset temperature difference. An axial chilled water cooler system characterized by judging and switching the first flow path and the second flow path alternately.

  According to (2), the temperature difference between the temperature of the axial cold water introduced into the axial cold water inlet and the temperature of the axial cold water discharged from the axial cold water outlet is monitored, and this temperature difference is a preset temperature. When it is smaller than the difference, it can be determined that the heat exchange efficiency by the axial cold water cooler is lowered. If the temperature of the axial cold water does not drop by the preset temperature difference even after passing through the axial cold water cooler, the flow of seawater in the cooling pipe is reversed and the state is continued. This makes it possible to remove the foreign matter at the seawater inlet or seawater outlet that caused the heat exchange efficiency to decrease, and then lengthen the period until the shaft cold water cooler is fully cleaned. it can. In addition, since the state in which seawater is circulating in the cooling pipe in the axial cold water cooler is continued, the cooling function of the axial cold water cooler can be maintained for a long period of time.

  (3) In (1) or (2), a first pressure gauge that measures the pressure of the seawater inlet portion and a second pressure gauge that measures the pressure of the seawater outlet portion, the control means includes: When the difference between the pressure measured by the first pressure gauge and the pressure measured by the second pressure gauge becomes a preset pressure difference, it is determined that the heat exchange efficiency has decreased, and the first flow path and the An axial chilled water cooler system, wherein the second flow path is switched alternately.

  According to (3), when seawater is flowing stably in the cooling pipe, the pressure difference between the inlet side and outlet side of the cooling pipe is small, but foreign matter is attached to the inlet side of the cooling pipe. The pressure difference between the inlet side and the outlet side of the cooling pipe becomes large. Therefore, the pressure difference between the seawater inlet and the seawater outlet is determined, and when the pressure difference is greater than the preset pressure difference as to whether the axial cold water cooler is functioning normally, the seawater in the cooling pipe Reverse the flow. This makes it possible to remove the foreign matter at the seawater inlet or seawater outlet that caused the heat exchange efficiency to decrease, and then lengthen the period until the shaft cold water cooler is fully cleaned. it can. In addition, since the state in which seawater is circulating in the cooling pipe in the axial cold water cooler is continued, the cooling function of the axial cold water cooler can be maintained for a long period of time.

  (4) In (1) to (3), a timer for measuring a time after alternately switching the first flow path and the second flow path is provided, and the control means is preset with the timer. The axial chilled water cooler system is characterized in that the first flow path and the second flow path are alternately switched when the measured time is counted.

  According to (4), it becomes possible to periodically switch the flow of seawater in the cooling pipe. Thereby, in particular, since the foreign matter adhering to the inlet side of the cooling pipe can be periodically removed, the cooling function of the axial cold water cooler can be stably maintained.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to clean an inside of a shaft cold water cooler, maintaining the cooling function of a shaft cold water cooler.

It is a block diagram which shows the structure of the axial cold water cooler system in one Embodiment of this invention. It is explanatory drawing which shows the flow of the seawater in one Embodiment of this invention. It is explanatory drawing which shows the flow of the seawater in one Embodiment of this invention. It is explanatory drawing which shows the structure of the axial cold water cooler. It is a block diagram which shows the electric constitution of this embodiment. It is a block diagram which shows the structure of the conventional axial cold water cooler system.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram illustrating a configuration of a shaft cold water cooler system according to an embodiment of the present invention. The shaft cold water cooler system 1 includes a first on-off valve 2, a second on-off valve 3, a third on-off valve 4, a fourth on-off valve 5, a first pipe 6, a second pipe 7, a third pipe 8, and a fourth pipe 9. And the axial cold water cooler 10 are provided.

  The first pipe 6 has one end connected to the seawater inlet and the other end connected to the seawater inlet 22 (see FIG. 4) of the axial cold water cooler 10. The first opening / closing valve 2 is provided in the first piping 6, and the first opening / closing valve 2 opens and closes the first piping 6.

  The second pipe 7 has one end connected to the seawater inlet and the other end connected to the seawater outlet 24 (see FIG. 4) of the axial cold water cooler 10. The second pipe 7 is provided with a second on-off valve 3, and the second on-off valve 3 opens and closes the second pipe 7.

  The third pipe 8 has one end connected to the seawater outlet 24 (see FIG. 4) of the axial cold water cooler 10 and the other end connected to the seawater outlet. The third pipe 8 is provided with a third on-off valve 4, and the third on-off valve 4 opens and closes the third pipe 8.

  The fourth pipe 9 has one end connected to the seawater inlet 22 (see FIG. 4) of the axial cold water cooler 10 and the other end connected to the seawater outlet. The fourth pipe 9 is provided with a fourth on-off valve 5, and the fourth on-off valve 5 opens and closes the fourth pipe 9.

  The axial cold water cooler 10 includes a cooling pipe 30 (see FIG. 4) for circulating seawater and an axial cold water chamber 12 in which the cooling pipe 30 is disposed. The axial cold water is cooled by seawater by passing the axial cold water heated for cooling the cooling target 200 through the axial cold water chamber 12. Further, the seawater heated by heat exchange with the axial cold water is discharged to the outside (sea) of the axial cold water cooler 10.

  Thereby, when the 1st on-off valve 2 and the 3rd on-off valve 4 are open | released and the 2nd on-off valve 3 and the 4th on-off valve 5 are closed, as shown by the thick line arrow of FIG. Seawater is introduced, and the seawater is discharged from the seawater discharge port through the first pipe 6, the axial cold water cooler 10, and the third pipe 8. In addition, when the first on-off valve 2 and the third on-off valve 4 are closed and the second on-off valve 3 and the fourth on-off valve 5 are opened, as shown by the bold arrows in FIG. The seawater is discharged from the seawater discharge port through the second pipe 7, the axial cold water cooler 10, and the fourth pipe 9. Here, the flow path of the seawater in the axial cold water cooler 10 in the path indicated by the thick arrow in FIG. 2 and the path indicated by the thick arrow in FIG.

  4A and 4B are explanatory views showing the configuration of the axial cold water cooler 10, in which FIG. 4A is a plan view, FIG. 4B is a side view, and FIG. 4C is a front view.

  As shown in FIGS. 4 (a) and 4 (b), the main body of the axial chilled water cooler 10 has a cylindrical axial chilled water chamber 12 with both ends open, and a cylindrical shape with one bottomed. Seawater inlet / outlet chamber 14 and a cylindrical intermediate chamber 16 having a bottom on one side. The seawater inlet / outlet chamber 14 is attached to one end of the axial cold water chamber 12, and the other end of the axial cold water chamber 12 is attached. This is a hollow body to which the intermediate chamber 16 is attached.

  A tube plate 18 is interposed between the seawater inlet / outlet chamber 14 and the axial cold water chamber 12, and the seawater inlet / outlet chamber 14 and the axial cold water chamber 12 are partitioned by the tube plate 18. A tube plate 20 is interposed between the intermediate chamber 16 and the axial cold water chamber 12, and the intermediate chamber 16 and the axial cold water chamber 12 are partitioned by the tube plate 20.

  Further, the seawater inlet / outlet chamber 14 is provided with a partition plate 26, by which the seawater inlet / outlet chamber 14 is connected to the seawater inlet chamber 14 a and seawater as shown in FIGS. 4 (a) and 4 (c). The outlet chamber 14b is divided. The seawater inlet chamber 14a is provided with a seawater inlet portion 22 for introducing seawater. Further, the seawater outlet chamber 14b is provided with a seawater outlet portion 24 for discharging seawater.

  The axial cold water chamber 12 is provided with an axial cold water inlet portion 32 for introducing axial cold water into the axial cold water chamber 12 and an axial cold water outlet portion 34 for discharging axial cold water in the axial cold water chamber 12. Further, one end of the cooling pipe 30 is attached to the tube plate 18, and the other end of the cooling pipe 30 is attached to the tube plate 20. Between the tube plate 18 and the tube plate 20, a plurality (about 4600) of cooling pipes 30 are disposed. By these cooling pipes 30, the inside of the seawater inlet / outlet chamber 14 and the inside of the intermediate chamber 16 are connected. , And fluid (seawater) can be moved from the seawater inlet / outlet chamber 14 to the intermediate chamber 16 and from the intermediate chamber 16 to the seawater inlet / outlet chamber 14.

  Seawater introduced from the seawater inlet portion 22 flows from the seawater inlet chamber 14 a into the cooling pipe 30 supported by the tube plate 18 of the seawater inlet chamber 14 a and moves to the intermediate chamber 16. In the intermediate chamber 16, the seawater flows into the cooling pipe 30 supported by the pipe plate 18 of the seawater outlet chamber 14b in the cooling pipe 30 supported by the pipe plate 20, and moves to the seawater outlet chamber 14b. Then, the seawater that has moved to the seawater outlet chamber 14 b is discharged from the seawater outlet portion 24. Thus, when seawater is introduced from the seawater inlet 22, the seawater inlet chamber 14 a, the cooling pipe 30, the intermediate chamber 16, the cooling pipe 30, and the seawater outlet chamber 14 b are shown in FIG. 4. The seawater moves along the route of the seawater outlet 24. This path will be referred to as a first flow path. On the contrary, when seawater is introduced from the seawater outlet 24, the seawater moves along the reverse path of the above-described path and is discharged from the seawater inlet 22 as shown by the two-dot chain line in FIG. The This reverse path will be referred to as a second flow path.

Next, the electrical configuration of the present embodiment will be described.
FIG. 5 is a block diagram showing a control system of the present embodiment. In FIG. 5, the information processing apparatus 50 performs opening / closing control of the first opening / closing valve 2, the second opening / closing valve 3, the third opening / closing valve 4, and the fourth opening / closing valve 5.

  The information processing device 50 is connected to a valve control device 52, a first thermometer 54, a second thermometer 55, a first pressure gauge 56, a second pressure gauge 58, and a timer 60.

  The valve control device 52 causes the first on-off valve 2, the second on-off valve 3, the third on-off valve 4, and the fourth on-off valve 5 to be opened / closed based on an instruction (command) from the information processing device 50. It is.

  The first thermometer 54 measures the temperature of the axial cold water introduced into the axial cold water inlet portion 32, and the second thermometer 55 measures the temperature of the axial cold water discharged from the axial cold water outlet portion 34. . The measurement results of the first thermometer 54 and the second thermometer 55 are transmitted to the information processing apparatus 50.

  The first pressure gauge 56 is provided in the seawater inlet chamber 14a and measures the water pressure in the seawater inlet chamber 14a. The second pressure gauge 58 is provided in the seawater outlet chamber 14b and measures the water pressure in the seawater outlet chamber 14b. The measurement results of the first pressure gauge 56 and the second pressure gauge 58 are transmitted to the information processing apparatus 50.

  The timer 60 is reset when the opening / closing control of the first opening / closing valve 2, the second opening / closing valve 3, the third opening / closing valve 4, and the fourth opening / closing valve 5 is executed, and newly starts timing. The time measurement result of the timer 60 is transmitted to the information processing apparatus 50.

  In the information processing apparatus 50, the heat exchange efficiency in the axial chilled water cooler 10 is reduced based on the result information transmitted from the first thermometer 54 and the second thermometer 55, the first pressure gauge 56 and the second pressure gauge 58. Determine whether or not. When it is determined that the heat exchange efficiency has decreased, a command for driving the first on-off valve 2, the second on-off valve 3, the third on-off valve 4, and the fourth on-off valve 5 is transmitted to the valve control device 52. . Further, the information processing apparatus 50 determines whether or not the timer 60 has timed a preset time. Then, when the timer 60 measures a preset time, the valve control device 52 issues a command for driving the first on-off valve 2, the second on-off valve 3, the third on-off valve 4, and the fourth on-off valve 5. Send. When such a command is transmitted from the information processing apparatus 50, the flow path in the axial cold water cooler 10 is the second flow path in the case of the first flow path, and the first flow in the case of the second flow path. Each is switched to a road.

  Then, after the flow path in the axial cold water cooler 10 is switched, each valve is maintained in the switched state until the information processing device 50 transmits a command for driving the valve. In the present embodiment, when the temperature difference between the first thermometer 54 and the second thermometer 55 becomes smaller than a predetermined value set in advance, or the pressure between the first pressure gauge 56 and the second pressure gauge 58. When the difference becomes larger than a predetermined value, the information processing apparatus 50 determines that the heat exchange efficiency in the axial cold water cooler 10 has decreased. That is, when the temperature difference between the first thermometer 54 and the second thermometer 55 becomes smaller than a predetermined value set in advance, the pressure difference between the first pressure gauge 56 and the second pressure gauge 58 is a predetermined value. In the case where the timer 60 has exceeded the predetermined time, the information processing apparatus 50 performs switching of the flow path when the timer 60 satisfies any of the cases where the preset time is measured.

Next, operation | movement of the axial cold water cooler system 1 of this embodiment is demonstrated.
When cooling the axial cold water, first, the seawater is circulated in the cooling pipe 30. For example, when the first on-off valve 2 and the third on-off valve 4 are opened and the second on-off valve 3 and the fourth on-off valve 5 are closed, seawater is introduced from the seawater inlet 22, and the seawater inlet chamber 14 a is cooled. Seawater moves through the path of the pipe 30, the intermediate chamber 16, the cooling pipe 30, the seawater outlet chamber 14b, and the seawater outlet portion 24, that is, the first flow path. In this state, heat is exchanged between the seawater passing through the cooling pipe 30 and the axial cold water in the axial cold water chamber 12 by introducing the axial cold water into the axial cold water chamber 12 from the axial cold water inlet portion 32. The axial cold water is cooled and discharged to the outside of the axial cold water cooler 10 via the axial cold water outlet 34. One seawater is heated and returned to the sea via the third pipe 8 from the seawater outlet chamber 14b.

  In a state where the axial cold water cooler system 1 is driven, the information processing device 50 is transmitted from the first thermometer 54, the second thermometer 55, the first pressure gauge 56, the second pressure gauge 58, and the timer 60. Monitor the result information. Here, if the cooling of the axial cold water is continued, if foreign matter enters the seawater inlet chamber 14a and the vicinity of the inlet of the cooling pipe 30 is blocked by the foreign matter, the circulation of the seawater in the cooling pipe 30 deteriorates. If the circulation of the seawater deteriorates, the axial cold water is not sufficiently cooled by the axial cold water cooler 10, and therefore the temperature of the axial cold water introduced into the axial cold water inlet portion 32 and the temperature of the axial cold water discharged from the axial cold water outlet portion 34 are reduced. The difference becomes smaller. Or the phenomenon that the difference of the water pressure in the seawater inlet chamber 14a and the water pressure in the seawater outlet chamber 14b becomes large will generate | occur | produce.

  Therefore, when the temperature difference between the first thermometer 54 and the second thermometer 55 becomes smaller than a predetermined value set in advance, the information processing apparatus 50 determines whether the first pressure gauge 56 and the second pressure gauge 58 When the pressure difference becomes larger than a predetermined value, a command for closing the first on-off valve 2 and the third on-off valve 4 and opening the second on-off valve 3 and the fourth on-off valve 5 is provided. It transmits to the control apparatus 52.

  The valve control device 52 that has received a command for closing the first on-off valve 2 and the third on-off valve 4 and opening the second on-off valve 3 and the fourth on-off valve 5 receives the command from the information processing device 50. Based on the control, the first on-off valve 2 and the third on-off valve 4 are closed, and the second on-off valve 3 and the fourth on-off valve 5 are opened. By closing the first on-off valve 2 and the third on-off valve 4 and opening the second on-off valve 3 and the fourth on-off valve 5, the seawater outlet 24, the seawater outlet chamber 14b, the cooling pipe 30, the intermediate chamber 16, Seawater moves through the path of the cooling pipe 30, the seawater inlet chamber 14a, and the seawater inlet portion 22, that is, the second flow path. As a result, the foreign matter accumulated in the seawater inlet chamber 14 a is washed away, and the foreign matter is discharged from the seawater inlet portion 22. At this time, since the state in which seawater is circulating in the axial cold water cooler 10 is maintained, the axial cold water is continuously cooled.

  Further, if the cooling of the axial cold water is continued while the seawater is moving in the second flow path in the axial cold water cooler 10, foreign matter enters the seawater outlet chamber 14b, and the circulation of the seawater in the cooling pipe 30 is poor. Become. Thereby, the difference between the temperature of the axial cold water introduced into the axial cold water inlet portion 32 and the temperature of the axial cold water discharged from the axial cold water outlet portion 34 is reduced. Or the phenomenon that the difference of the water pressure in the seawater inlet chamber 14a and the water pressure in the seawater outlet chamber 14b becomes large will generate | occur | produce.

  Therefore, when the information processing apparatus 50 has a temperature difference between the first thermometer 54 and the second thermometer 55 smaller than a predetermined value set in advance, or the first pressure gauge 56 and the second pressure gauge 58 A command for opening the first on-off valve 2 and the third on-off valve 4 and closing the second on-off valve 3 and the fourth on-off valve 5 when the pressure difference between the two is greater than a predetermined value. It transmits to the valve control apparatus 52.

  The valve control device 52 that has received a command for opening the first on-off valve 2 and the third on-off valve 4 and closing the second on-off valve 3 and the fourth on-off valve 5 receives the command from the information processing device 50. Based on the control, the first on-off valve 2 and the third on-off valve 4 are opened, and the second on-off valve 3 and the fourth on-off valve 5 are closed. As a result, seawater moves again in the first flow path. Thereby, the foreign matter accumulated in the seawater outlet chamber 14 b is washed away, and the foreign matter is discharged from the seawater outlet portion 24.

  By the way, the state where the switching of the flow path is not executed by the monitoring of the first thermometer 54 and the second thermometer 55 or the first pressure gauge 56 and the second pressure gauge 58 continues for a long time. If seawater is circulated through the flow path and the state of cooling the axial cold water is continued, shellfish larvae that have entered the seawater inlet chamber 14a may grow in the seawater inlet chamber 14a and block the cooling pipe 30. In particular, it takes a lot of labor to remove shellfish that are densely packed near the cooling pipe 30.

  Therefore, according to the present embodiment, when the timer 60 counts a preset time, the first on-off valve 2, the second on-off valve 3, the third on-off valve 4, and the fourth on-off valve 5 are switched on and off. The seawater flow path in the cooling pipe 30 is switched. For this reason, by switching the flow path again after a certain period of time has elapsed since the previous flow path switching, for example, the shell larvae are removed together with the foreign matter before the shell larvae grow in the seawater inlet chamber 14a. It becomes possible.

  As described above, according to the present embodiment, in the state where the seawater in the cooling pipe 30 is moving in the direction from the seawater inlet portion 22 toward the seawater outlet portion 24, the information processing device 50 is connected to the axial cold water cooler 10. That is, when the temperature difference between the first thermometer 54 and the second thermometer 55 is smaller than a predetermined value set in advance, or with the first pressure gauge 56 When the pressure difference with the 2nd pressure gauge 58 becomes larger than a predetermined value, the flow of the seawater in the cooling pipe 30 is reversed and the state is continued. Thereby, it becomes possible to remove by washing away the foreign matter that caused the heat exchange efficiency to decrease. Thereby, it becomes possible to lengthen the period which cleans the axial cold water cooler 10 in earnest. And since the state which the seawater is distribute | circulating to the cooling pipe 30 in the axial cold water cooler 10 is continued, the function which cools axial cold water can be maintained. Thus, the cooling function of the axial cold water cooler 10 can be maintained for a long time.

  As mentioned above, although this invention was demonstrated, this invention is not restricted to embodiment mentioned above. For example, if the cooling efficiency of the axial chilled water cooler 10 is not improved even when the flow path is switched, a control signal is transmitted from the information processing device 50 to an external device (for example, a display device), and the axial chilled water cooler 10 You may make it alert | report that it is necessary to clean.

DESCRIPTION OF SYMBOLS 1 axis | shaft cold water cooler system 2 1st on-off valve 3 2nd on-off valve 4 3rd on-off valve 5 4th on-off valve 6 1st piping 7 2nd piping 8 3rd piping 9 4th piping 10 axial cold water cooler 12 axial cold water chamber 14 Seawater inlet / outlet chamber 14a Seawater inlet chamber 14b Seawater outlet chamber 16 Intermediate chamber 18, 20 Tube plate 22 Seawater inlet portion 24 Seawater outlet portion 26 Partition plate 30 Cooling pipe 32 Axis cold water inlet portion 34 Axis cold water outlet portion 50 Information processing device 52 Valve control Device 54 First thermometer 55 Second thermometer 56 First pressure gauge 58 Second pressure gauge 60 Timer 200 Object to be cooled

Claims (4)

In shaft cooling water cooler system that cools bearing cooling water with seawater,
A first pipe having one end connected to a seawater inlet for introducing seawater;
A seawater inlet part connected to the other end of the first pipe, a cooling part containing a cooling pipe for passing seawater at the seawater inlet part, a seawater outlet part for discharging seawater that has passed through the cooling pipe, and the cooling part A shaft chilled water cooler comprising a shaft chilled water inlet for introducing bearing cooling water, and a shaft chilled water outlet for discharging bearing cooling water in the cooling unit;
A second pipe having one end connected to a seawater inlet for introducing seawater and the other end connected to the seawater outlet;
A third pipe having one end connected to the seawater outlet and the other end connected to a seawater outlet for discharging seawater;
A fourth pipe having one end connected to the seawater inlet and the other end connected to a seawater outlet for discharging seawater;
A first on-off valve provided in the first pipe for opening and closing the first pipe;
A second on-off valve provided in the second pipe for opening and closing the second pipe;
A third on-off valve provided in the third pipe for opening and closing the third pipe;
A fourth on-off valve provided in the fourth pipe for opening and closing the fourth pipe;
Control means for performing on-off control of the first on-off valve, the second on-off valve, the third on-off valve, and the fourth on-off valve;
The control means opens the first on-off valve and the third on-off valve and closes the second on-off valve and the fourth on-off valve when it is determined that the heat exchange efficiency in the shaft cold water cooler has decreased. And opening the first flow path for moving the seawater in the cooling pipe in the direction from the seawater inlet to the seawater outlet, the second on-off valve, and the fourth on-off valve, and the first on-off valve. And the 3rd on-off valve is closed, and the 2nd flow path which moves the seawater in the said cooling pipe in the direction which goes to the said seawater inlet part from the said seawater outlet part is switched alternately, The axial chilled water cooler system characterized by the above-mentioned . A first thermometer for measuring the temperature of bearing cooling water introduced into the shaft cold water inlet,
A second thermometer for measuring the temperature of the bearing cooling water discharged from the shaft cold water outlet,
The control means determines that the heat exchange efficiency has decreased when the difference between the temperature measured by the first thermometer and the temperature measured by the second thermometer becomes a preset temperature difference, and The axial chilled water cooler system according to claim 1, wherein one channel and the second channel are alternately switched. A first pressure gauge for measuring the pressure at the seawater inlet,
A second pressure gauge for measuring the pressure at the seawater outlet,
The control means determines that the heat exchange efficiency has decreased when the difference between the pressure measured by the first pressure gauge and the pressure measured by the second pressure gauge is a preset pressure difference, The axial chilled water cooler system according to claim 1 or 2, wherein the first flow path and the second flow path are alternately switched. A timer for measuring the time after alternately switching the first flow path and the second flow path;
The said control means switches the said 1st flow path and the said 2nd flow path alternately, when the said timer measures the preset time, The Claim 1 thru | or 3 characterized by the above-mentioned. Axial cold water cooler system.

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