Backwash equipment for fluid coolers

Abstract

To provide a backwash system used for a fluid cooler that cools target fluid by using seawater, the backwash system having an improved effect of backwashing an inlet water room for taking in seawater through a seawater inlet pipe and an inlet cooling pipe for moving the seawater taken into the inlet water room to another water room.SOLUTION: A backwash system is used for a fluid cooler 1 in which seawater introduced into an inlet water room 5 through a seawater inlet pipe 11 is moved to another water room through an inlet cooling pipe 8, and heat exchange with the seawater flowing in the inlet cooling pipe 8 causes target fluid (condensate) flowing around the inlet cooling pipe 8 to be cooled. At a position that is on a seawater introduction side with respect to the inlet cooling pipe 8 and is also lower than the inlet cooling pipe 8, provided is extraction piping 50 that can be opened and closed with an extraction valve 51. At the time of backwashing, the extraction valve 51 is opened to cause the backwash water to flow into the inlet water room 5 from the inlet cooling pipe 8; and the backwash water drops down in the inlet water room 5 and then is discharged out through the extraction piping 50. The fluid cooler 1 may be a condensate cooler 100 or a condenser.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a backwashing system used in a fluid cooler that cools a cooled fluid such as condensate with seawater, and in particular to a backwashing system for a fluid cooler that enables backwashing of an inlet water chamber that introduces seawater and an inlet cooling pipe that moves seawater from this inlet water chamber to another water chamber. [Background technology]

[0002] In plants that employ a condensate cooling system in which the hydrogen gas used to cool the generator is cooled by condensation, a condensate cooler is used to exchange heat between the condensate and seawater in order to effectively cool the condensate (see non-patent document 1).

[0003] Such a condensate cooler may, for example, be a two-pass type cooler as shown in Figure 10(a), in which an inlet water chamber 5 and an outlet water chamber 6 separated into left and right are provided in a header 3 provided at one end of the fuselage 2, a turn-back water chamber 7 is provided in a header 4 provided at the other end of the fuselage 2, a seawater inlet pipe 11 is connected to the inlet water chamber 5 from below, and a seawater outlet pipe 12 is connected to the outlet water chamber 6 from below, and seawater introduced into the inlet water chamber 5 via the seawater inlet pipe 11 is guided to the turn-back water chamber 7 via an inlet cooling pipe 8 that penetrates the interior of the fuselage 2, and seawater introduced into the turn-back water chamber 7 is guided to the outlet water chamber 6 via an outlet cooling pipe 9 that penetrates the interior of the fuselage 2, and then discharged from the seawater outlet pipe 12. In addition, a condensate inlet pipe 13 through which the condensate flows in and a condensate outlet pipe 14 through which the condensate flows out are connected to the fuselage 2, and the condensate that flows into the fuselage via the condensate inlet pipe 13 is cooled by heat exchange with seawater flowing inside the cooling pipes (inlet cooling pipe 8 and outlet cooling pipe 9) and flows out of the fuselage 2 via the condensate outlet pipe 14.

[0004] In such a condensate cooler, if the inlet cooling pipe 8 is clogged with shellfish or other foreign objects, the flow of seawater through the inlet cooling pipe 8 is impaired, making it impossible to effectively cool the condensate. This causes the temperature of the hydrogen gas in the generator, which is exchanging heat with the condensate, to rise, resulting in the inconvenience of being unable to sufficiently cool the generator.

[0005] Therefore, in order to deal with the rise in condensate temperature caused by blockage of the inlet cooling pipe 8, as shown in Figure 10 (b), an industrial water supply pipe 17 is connected to the header 4 which defines the turn back water chamber 7, and the inlet water chamber cover 34, which is located above the connection part with the seawater inlet pipe 11 of the header 3 and facing approximately the center of the inlet water chamber 5, is removed and the extraction pipe 50 is connected, the inlet valve 15 which opens and closes the seawater inlet pipe 11 and the outlet valve 16 which opens and closes the seawater outlet pipe 12 are closed, the extraction valve 51 which opens and closes the extraction pipe 50 is opened, and then the industrial water supply valve 18 which opens and closes the industrial water supply pipe 17 is opened to supply industrial water (backwash water) pressurized by the pump 20 from the industrial water header 19 to the turn back water chamber 7, and then it is supplied to the inlet water chamber 5 through the inlet cooling pipe 8, thereby enabling backwashing. [Prior art documents] [Non-patent literature]

[0006] [Non-Patent Document 1] "Results of performance test of the first 125,000kW generating equipment delivered to Chugoku Electric Power Co., Inc. Mizushima Thermal Power Plant", uDC21.311.22.001.42 Summary of the Invention [Problem to be solved by the invention]

[0007] However, since the backwash water (industrial water) is introduced into the inlet water chamber 5 via the inlet cooling pipe 8 and then extracted from a position facing approximately the center of the inlet water chamber 5 via the extraction pipe 50, about the lower half of the inlet water chamber 5 is filled with backwash water during backwashing, and the flow of backwash water into the inlet water chamber does not gain momentum, and in particular, foreign matter accumulated at the bottom of the inlet water chamber 5 and foreign matter clogged in the inlet cooling pipe 8 connected to the bottom of the inlet water chamber 5 are likely to remain. If the foreign matter is not sufficiently removed by backwashing, it is necessary to manually clean the cooling pipe by reducing the output of the generator, for example.

[0008] It is expected that such a decrease in heat exchange capacity due to foreign objects in the seawater clogging the cooling pipes will occur frequently during times when shellfish are abundant, so there is a demand to improve backwashing performance and effectively clear blockages in the inlet cooling pipes using backwashing alone.

[0009] In addition, such a decrease in heat exchange capacity due to foreign matter in the seawater is an event that can occur not only in the two-pass type condensate cooler described above, but also in one-pass type condensate coolers, and also in other heat exchangers that use seawater to cool the cooled fluid (for example, condensers that use seawater to cool and condense water vapor).

[0010] The present invention has been made in consideration of the above circumstances, and has as its main objective the provision of a backwashing system for a fluid cooler that can enhance the backwashing effect of the inlet cooling pipe and the cooling water chamber during backwashing in a fluid cooler that uses seawater as a cooling medium. [Means for solving the problem]

[0011] In order to achieve the above object, the backwashing equipment for a fluid cooler according to the present invention has an inlet water chamber into which seawater is introduced through a seawater inlet pipe, and an inlet cooling pipe that moves the seawater introduced into the inlet water chamber to another water chamber, The present invention is used in a fluid cooler having a heat exchange section that cools a fluid to be cooled flowing around the inlet cooling pipe by heat exchange with seawater flowing at least inside the inlet cooling pipe, In a backwash system for a fluid cooler, the inlet cooling pipe and the inlet water chamber can be backwashed with backwash water supplied from a downstream side by stopping seawater introduced into the inlet water chamber through the seawater inlet pipe, an industrial water supply pipe that is opened and closed by an industrial water supply valve is connected to the other water chamber, and the industrial water pumped by the pump can be supplied to the other water chamber by opening the industrial water supply valve; A drain pipe that can be opened and closed by a drain valve is provided at a position on the seawater inlet side of the inlet cooling pipe and below the inlet cooling pipe. The industrial water supply valve; The backwash water flowing from the inlet cooling pipe into the inlet water chamber by opening the extraction valve is allowed to fall and then discharged via the extraction pipe.

[0012] Therefore, since the outlet piping is located below the inlet cooling pipe, the inlet water chamber is not filled with backwash water during backwash, and the backwash water supplied from downstream of the inlet cooling pipe flows into the inlet water chamber from the inlet cooling pipe, falls downward and is then discharged through the outlet piping. Therefore, the force of the backwash water flowing from the inlet cooling pipe into the inlet water chamber is increased due to the supply pressure of the backwash water and the flow-promoting effect of dropping the backwash water, making it possible to effectively remove foreign matter that has been clogged in the inlet cooling pipe or that has accumulated in the inlet water chamber (including foreign matter that has accumulated in the inlet cooling pipe connected to the lower part of the inlet water chamber or in the lower part of the inlet water chamber).

[0013] Here, when the seawater inlet pipe is connected to the inlet water chamber from below, the discharge pipe may be connected to a portion of the seawater inlet pipe below the inlet water chamber (for example, an elbow portion from which the seawater inlet pipe rises). The discharge pipe may also be directly connected to the lower end of the inlet water chamber.

[0014] The fluid cooler may be a two-pass type cooler or a one-pass type cooler. If it is a two-pass type fluid cooler, an inlet cooling pipe having one end opening into the inlet water chamber and the other end opening into the turn-back water chamber, for moving seawater introduced into the inlet water chamber to the turn-back water chamber; and an outlet cooling pipe having one end opening into the turn-back water chamber and the other end opening into the outlet water chamber, for moving seawater introduced into the turn-back water chamber to the outlet water chamber, the heat exchange unit cools the cooled fluid flowing around the inlet cooling pipe by heat exchange with seawater flowing in the inlet cooling pipe, and cools the cooled fluid flowing around the outlet cooling pipe by heat exchange with seawater flowing in the outlet cooling pipe, an industrial water supply pipe that is opened and closed by an industrial water supply valve is connected to the turning water chamber, and the industrial water pressurized by the pump can be supplied to the turning water chamber by opening the industrial water supply valve; During backwashing, water is supplied to the return water chamber. The above mentioned industrial water Preferably, the inlet cooling pipe and the inlet water chamber are backwashed by

[0015] Also, if it is a one-pass type fluid cooler, an inlet cooling pipe having one end opening to the inlet water chamber and the other end opening to the outlet water chamber, for moving seawater introduced into the inlet water chamber to the outlet water chamber; the heat exchanger cools a fluid to be cooled flowing around the inlet cooling pipe by heat exchange with seawater flowing inside the inlet cooling pipe, an industrial water supply pipe that is opened and closed by an industrial water supply valve is connected to the outlet water chamber, and industrial water pumped by a pump can be supplied to the outlet water chamber by opening the industrial water supply valve; During backwashing, water is supplied to the outlet water chamber. The above mentioned industrial water Preferably, the inlet cooling pipe and the inlet water chamber are backwashed by

[0016] In addition, even if the heat exchange section of the fluid cooler exchanges heat between the seawater in the cooling pipe and the cooled fluid flowing around the cooling pipe without particularly covering the cooling pipe, it may be configured by providing a hollow body that passes through at least the inlet cooling pipe, and connecting a cooled fluid inlet pipe, through which the cooled fluid flows into the body, and a cooled fluid outlet pipe, through which the cooled fluid flows out from within the body, to the peripheral wall of this body, so that the cooled fluid flowed into the body exchanges heat with the seawater. Effect of the Invention

[0017] As described above, according to the present invention, in equipment for backwashing a fluid cooler having an inlet water chamber for introducing seawater through a seawater inlet pipe, and an inlet cooling pipe for moving the seawater introduced into the inlet water chamber to another water chamber, and equipped with a heat exchange section for cooling a cooled fluid flowing around the inlet cooling pipe by heat exchange with the seawater flowing inside the inlet cooling pipe, an extraction pipe that can be opened and closed by an extraction valve is provided at a position on the seawater introduction side of the inlet cooling pipe and below the inlet cooling pipe, and during backwashing, the extraction valve is opened to allow the backwash water flowing from the inlet cooling pipe into the inlet water chamber to fall and then be discharged through the extraction pipe. Therefore, the backwash water supplied from downstream of the inlet cooling pipe can be quickly extracted without stagnation in the inlet water chamber after passing through the inlet cooling pipe, and the momentum of the backwash water flowing through the inlet cooling pipe and the inlet water chamber can be strengthened by the synergistic effect of the supply pressure of the backwash water and the flow promoting effect of dropping the backwash water. As a result, foreign matter that has clogged the inlet cooling pipe and foreign matter that has accumulated in the inlet water chamber can be effectively removed, thereby improving the backwash effect of the inlet cooling pipe and the cooling water chamber. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a diagram showing a backwash facility when a two-pass type condensate cooler is used as the fluid cooler according to the present invention. [Diagram 2] FIG. 2 is a diagram showing a specific configuration example of the condensate cooler of FIG. 1, where (a) is a side view and (b) is a cross-sectional view taken along line AA of (a). [Diagram 3] Figure 3(a) is a view of the condensate cooler in Figure 2 as viewed in the axial direction from line BB, and Figure 3(b) is a view of the condensate cooler in Figure 2 as viewed in the axial direction from line C-C (a view of the front tube sheet as viewed in the axial direction). [Figure 4] Figure 4(a) is a view of the condensate cooler in Figure 2 as viewed in the axial direction from line DD, and Figure 4(b) is a view of the condensate cooler in Figure 2 as viewed in the axial direction from line E-E (a view of the rear tube sheet as viewed in the axial direction). [Diagram 5]FIG. 5(a) is a diagram showing the flow of seawater and the flow of condensate during condensate cooling operation in the backwash equipment for the condensate cooler of FIG. 1, and FIG. 5(b) is a diagram showing the flow of backwash water (industrial water) and the flow of condensate during backwash in the backwash equipment for the condensate cooler of FIG. 1. [Figure 6] FIG. 6 is a diagram showing a backwash facility when a one-pass type condensate cooler is used as the fluid cooler according to the present invention. [Figure 7] FIG. 7(a) is a diagram showing the flow of seawater and the flow of condensate during condensate cooling operation in the backwash equipment for the condensate cooler of FIG. 6, and FIG. 7(b) is a diagram showing the flow of backwash water (industrial water) and the flow of condensate during backwash in the backwash equipment for the condensate cooler of FIG. 6. [Figure 8] FIG. 8 is a diagram showing an example in which a seawater inlet pipe and a seawater outlet pipe are disposed above an inlet water chamber in a fluid cooler. [Figure 9] FIG. 9 is a diagram showing a backwashing system when a condenser is used as the fluid cooler according to the present invention, where (a) is a diagram showing the case where a two-pass type condenser is used, and (b) is a diagram showing the case where a one-pass type condenser is used. [Figure 10] FIG. 10 is a diagram illustrating a conventional facility using a two-pass type condensate cooler, where (a) is a diagram of the condensate cooler viewed from the axial direction and a diagram showing the flow of seawater and condensate during condensate cooling operation, and (b) is a diagram showing the flow of backwash water (industrial water) and condensate during backwashing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0020] 1 to 4, a two-pass type condensate cooler 100 is shown as the fluid cooler 1. As shown in FIG. This condensate cooler 100 comprises a hollow body 2 and headers 3, 4 at both ends of the body, with an inlet water chamber 5 and an outlet water chamber 6 arranged side by side in one header 3, and a turn-back water chamber 7 provided in the other header 4. Also arranged within the body 2 are an inlet cooling pipe 8 that connects the inlet water chamber 5 and the turn-back water chamber 7, and an outlet cooling pipe 9 that connects the turn-back water chamber 7 and the outlet water chamber 6.

[0021] One of the headers 3 is composed of a front tube plate 31 arranged to close one of the open ends of the body 2, and a front header cover 32 assembled to cover this front tube plate 31. A partition wall 33 is formed integrally with the inside of the front header cover 32 to separate it into left and right sides. This partition wall 33 is airtightly abutted against a separation wall 31c arranged to span the top and bottom of the central part of the front tube plate 31, dividing the interior into an inlet water chamber 5 and an outlet water chamber 6.

[0022] The other header 4 is composed of a rear tube plate 41 arranged to close the other open end of the body 2, and a rear header cover 42 assembled to cover this rear tube plate 41, and the inside is defined as a turn-back water chamber 7 without any particular separation.

[0023] The body 2, together with the cooling pipes (inlet cooling pipe 8, outlet cooling pipe 9), constitutes a heat exchange section 10 which exchanges heat between seawater and condensate, and is divided by a central partition plate 21 extending axially from the front tube plate 31 to the vicinity of the rear tube plate 41 into an axially extending condensate outflow passage 22 and an axially extending condensate return passage 23 which communicates with the condensate outflow passage 22 just before the rear tube plate 41.

[0024] The inlet cooling pipe 8 penetrates the condensate return passage 23 in the axial direction. One end of the inlet cooling pipe 8 is inserted and fixed in the through hole 31a formed in the front tube plate 31 and opens into the inlet water chamber 5, and the other end of the inlet cooling pipe 8 is inserted and fixed in the through hole 41a formed in the rear tube plate 41 and opens into the turn-back water chamber 7. The inlet cooling pipe 8 is attached to each of the many through holes 31a, 41a formed in each of the tube plates (front tube plate 31 and rear tube plate 41) (only one inlet cooling pipe 8 is shown in FIG. 2(b) for convenience of explanation), and is supported by a plurality of support plates 26, 27 arranged at a predetermined interval in the axial direction inside the body 2. The plurality of support plates 26, 27 are arranged substantially perpendicular to the inlet cooling pipe 8 and are arranged in a staggered manner in the condensate return passage 23 so that the condensate flowing through the condensate return passage 23 flows in a zigzag pattern.

[0025] An outlet cooling pipe 9 penetrates the condensate outflow passage 22 in the axial direction. One end of the outlet cooling pipe 9 is inserted and fixed in a through hole 41b formed in the rear tube plate 41 and opens into the turn-back water chamber 7, and the other end of the outlet cooling pipe 9 is inserted and fixed in a through hole 31b formed in the front tube plate 31 and opens into the outlet water chamber 6. The outlet cooling pipe 9 is attached to each of the many through holes 31a, 41a formed in each of the tube plates (the front tube plate 31 and the rear tube plate 41) (only one outlet cooling pipe is shown in FIG. 2(b) for convenience of explanation), and is supported by a plurality of support plates 27, 28 arranged at predetermined intervals in the axial direction inside the body 2. The plurality of support plates 27, 28 are arranged substantially perpendicular to the outlet cooling pipe 9, and are arranged in a staggered manner in the condensate outflow passage 22 so that the condensate flowing through the condensate outflow passage 22 flows in a zigzag pattern.

[0026] An inlet water chamber lid 34 is removably provided at approximately the center of the front end of the front header cover 32 facing the inlet water chamber 5, and an outlet water chamber lid 35 is removably provided at approximately the center of the front end facing the outlet water chamber 6. Further, a rear water chamber lid 43 is detachably provided on the rear header cover 42 at approximately the center of the rear end portion facing the folded back water chamber 7 .

[0027] Below the inlet water chamber lid 34 of the front header cover 32, a seawater inlet section 36 is provided so as to open downward, and a seawater inlet pipe 11 rising from below is connected to this seawater inlet section 36. Also, below the outlet water chamber lid 35 of the front header cover 32, a seawater outlet section 37 is provided so as to open downward, and a seawater outlet pipe 12 rising from below is connected to this seawater outlet section 37.

[0028] A condensate inlet portion 24 is provided so as to open downward at the lower part of the side surface of the body 2 near the outlet water chamber 6 on the condensate outward side, and a condensate inlet pipe 13 rising from below is connected to this condensate inlet portion 24. Furthermore, a condensate outlet portion 25 is provided so as to open downward at the lower part of the side surface of the body 2 near the inlet water chamber 5 on the condensate inward side, and a condensate outlet pipe 14 rising from below is connected to this condensate outlet portion 25.

[0029] In such a condensate cooler 100, an inlet valve 15 for opening and closing the seawater inlet pipe 11 is provided in the middle of the seawater inlet pipe 11, and an outlet valve 16 for opening and closing the seawater outlet pipe 12 is provided in the middle of the seawater outlet pipe 12. In addition, an industrial water supply pipe 17 can be connected to the turn-back water chamber 7 by removing the rear water chamber cover 43. This industrial water supply pipe 17 may be connected to the turn-back water chamber 7 (rear header cover 42) when backwashing the condensate cooler 100, or may be connected at all times. By opening an industrial water supply valve 18 for opening and closing the industrial water supply pipe 17, industrial water pumped from an industrial water header 19 by a pump 20 can be supplied to the turn-back water chamber 7.

[0030] In the above configuration, an extraction pipe that can be opened and closed by an extraction valve is provided at a position that is closer to the seawater introduction side than the inlet cooling pipe and lower than the inlet cooling pipe 8. In this example, an extraction pipe 50 is connected to a portion of the seawater inlet pipe 11 that is below the inlet water chamber 5 and is partway up (for example, the seawater inlet pipe 11 is connected to the seawater inlet section 36 below the inlet water chamber 5, and an elbow section 11a partway up the seawater inlet pipe 11 located below the inlet water chamber). This extraction pipe 50 is opened and closed by an extraction valve 51, and is closed during normal heat exchange, and is opened during backwashing in which industrial water is supplied from the downstream side, so that industrial water flowing backward from the inlet water chamber 5 through the seawater inlet pipe 11 is extracted through the extraction pipe 50 from the elbow section 11a provided near the connection with the seawater inlet section 36.

[0031] In the above configuration, during operation in which the condensate is cooled by heat exchange with seawater, as shown in Figure 5(a), the inlet valve 15 and outlet valve 16 are opened, the withdrawal valve 51 is closed, and if the industrial water supply pipe 17 is connected, the industrial water supply valve 18 is closed. As a result, seawater introduced into the inlet water chamber 5 through the seawater inlet pipe 11 is guided through the inlet cooling pipe 8 to the turn back water chamber 7, then through the outlet cooling pipe 9 to the outlet water chamber 6, and then discharged from the seawater outlet pipe 12. Condensate constantly flows from the condensate inlet pipe 13 through the condensate inlet section 24 into the condensate outward passage 22 of the fuselage 2, and flows out from the condensate return passage 23 through the condensate outlet section 25 to the condensate outlet pipe 14, so that the condensate that has flowed into the fuselage 2 is cooled by the seawater flowing in the outlet cooling pipe 9 as it flows through the condensate outward passage 22, and is also cooled by the seawater flowing in the inlet cooling pipe 8 as it flows through the condensate return passage 23.

[0032] The cooling of the condensate can be achieved as desired if the seawater flows smoothly through the cooling pipes; however, if foreign matter in the seawater, such as shellfish, clogs the inlet cooling pipe 8 and the flow of seawater in the inlet cooling pipe 8 becomes poor, the condensate cannot be cooled sufficiently. Therefore, as shown in Figure 5 (b), the inlet valve 15 and outlet valve 16 are closed, the drain valve 51 is opened, and the industrial water supply valve 18 is opened (if the industrial water supply pipe 17 is not connected to the rear header cover 42 (turnback water chamber 7), it is connected and then the industrial water supply valve 18 is opened).

[0033] Then, industrial water is supplied to the turn-back water chamber 7 from the industrial water header 19 at a predetermined water pressure, and then the industrial water is sent from the turn-back water chamber 7 through the inlet cooling pipe 8 to the inlet water chamber 5, and from the inlet water chamber 5 enters the seawater inlet pipe 11 via the seawater inlet section 36, and then is extracted from the extraction piping 50 connected to the elbow section 11a.

[0034] Since the discharge pipe 50 is connected to the lower part of the inlet water chamber 5 (the part below the inlet cooling pipe 8), backwash water (industrial water) is discharged without accumulating in the inlet water chamber 5 during backwashing. Also, the backwash water (industrial water) that flows from the inlet cooling pipe 8 into the inlet water chamber 5 falls inside the inlet water chamber 5, and further, since the seawater inlet portion 36 opens downward from the inlet water chamber and is connected to the seawater inlet pipe in this example, it flows further down inside the seawater inlet pipe 11 via the seawater inlet portion 36, and then the seawater inlet Since the backwash water (industrial water) is discharged from the elbow portion 11a of the inlet pipe 11 while maintaining its momentum, the flow of the backwash water is promoted by dropping the backwash water in addition to the delivery pressure of the backwash water (industrial water) by the pump 20, and the momentum of the flow of the backwash water (industrial water) flowing through the inlet cooling pipe and the inlet water chamber is increased, so that foreign matter stuck in the inlet cooling pipe or remaining in the inlet water chamber can be pushed out from the seawater inlet portion 36 provided at the bottom of the inlet water chamber to the seawater inlet pipe 11 and discharged through the discharge pipe 50. Moreover, since the discharge pipe 50 is connected to the elbow portion 11a in the middle of the rise of the seawater inlet pipe 11, the industrial water with increased momentum can be discharged as it is from the discharge pipe due to the synergistic effect of the supply pressure of the backwash water and the flow promotion effect by dropping the backwash water, so that the foreign matter can be effectively discharged to the outside.

[0035] In the above example, the outlet valve 16 is closed during backwash and the industrial water flows only through the inlet cooling pipe 8. However, in order to avoid impairing the cooling capacity of the condensate, the outlet valve 16 may also be opened during backwash and the industrial water may be supplied to the inlet water chamber 5 through the inlet cooling pipe 8 and also to the outlet water chamber 6 through the outlet cooling pipe 9, and then discharged from the seawater outlet pipe 12. In this way, it is possible to cool the condensate in both the condensate outflow path 22 and the condensate return path 23, while also backwashing the inlet cooling pipe 8 and the inlet water chamber 5.

[0036] In the above example, the two-pass type condensate cooler 100 is shown as the fluid cooler 1, but the one-pass type condensate cooler 200 may also be provided with the extraction pipe 50 for backwashing in the same manner.

[0037] 6 shows an example of a one-pass type condensate cooler 200, which includes a hollow body 2 and headers 3, 4 at both ends of the body, with an inlet water chamber 5 provided in one header 3 and an outlet water chamber 6 provided in the other header 4. An inlet cooling pipe 8 that connects the inlet water chamber 5 and the outlet water chamber 6 is disposed within the body 2.

[0038] One of the headers 3 is composed of a front tube plate 31 arranged to close one open end of the body 2, and a front header cover 32 assembled to cover this front tube plate 31, and its interior is defined as an inlet water chamber 5 without any particular separation.

[0039] The other header 4 is composed of a rear tube plate 41 arranged to close the other open end of the body 2, and a rear header cover 42 assembled to cover this rear tube plate 41, and its interior is defined as an outlet water chamber 6 without any particular separation.

[0040] The body 2, together with the inlet cooling pipes 8, constitutes a heat exchange section 10 which exchanges heat between seawater and condensate, and is divided by a central partition plate 21 which extends axially from the front tube plate 31 to the vicinity of the rear tube plate 41 into a condensate outflow passage 22 which extends axially inside, and a condensate return passage 23 which extends axially and communicates with the condensate outflow passage 22 just before the rear tube plate 41.

[0041] An inlet cooling pipe 8 penetrates axially through the condensate outflow passage 22 and the condensate return passage 23, one end of which is inserted and fixed into a through hole 31a formed in the front tube plate 31 and opens into the inlet water chamber 5, and the other end of which is inserted and fixed into a through hole 41a formed in the rear tube plate 41 and opens into the outlet water chamber 6.

[0042] A seawater inlet 36 is provided at the bottom of the front header cover 32 so as to open downward, and a seawater inlet pipe 11 rising from below is connected to this seawater inlet 36. A seawater outlet 37 is provided at the bottom of the rear header cover 42 so as to open downward, and a seawater outlet pipe 12 rising from below is connected to this seawater outlet 37. A rear water chamber lid 43 is detachably provided on the rear header cover 42, approximately in the center of the rear end facing the outlet water chamber 6.

[0043] A condensate inlet portion 24 is provided at the lower part of one side surface of the body 2 near the inlet water chamber 5 on the condensate outward side so as to open downward, and a condensate inlet pipe 13 rising from below is connected to this condensate inlet portion 24. Moreover, a condensate outlet portion 25 is provided at the lower part of the other side surface of the body 2 near the inlet water chamber 5 on the condensate return side so as to open downward, and a condensate outlet pipe 14 rising from below is connected to this condensate outlet portion 25.

[0044] In the above configuration, an extraction pipe 50 is connected to a portion of the seawater inlet pipe 11 below the inlet water chamber 5 and midway up the pipe (in this example, the seawater inlet pipe 11 is connected to the seawater inlet section 36 below the inlet water chamber 5, and an elbow section 11a midway up the seawater inlet pipe 11 located below the inlet water chamber 5) as in Fig. 3(a). This extraction pipe 50 is opened and closed by an extraction valve 51, and is closed during normal heat exchange, and is opened during backwashing in which industrial water is supplied from the downstream side, so that industrial water flowing back through the seawater inlet pipe 11 from the inlet water chamber 5 is extracted via the extraction pipe 50 from the elbow section 11a provided near the connection with the seawater inlet section 36.

[0045] In such a configuration, during operation in which the condensate is cooled by heat exchange with seawater, as shown in Figure 7(a), the inlet valve 15 and outlet valve 16 are opened, the withdrawal valve 51 is closed, and if the industrial water supply pipe 17 is connected, the industrial water supply valve 18 is closed. As a result, seawater introduced into inlet water chamber 5 via seawater inlet pipe 11 is guided through inlet cooling pipe 8 to outlet water chamber 6, and then discharged from seawater outlet pipe 12. Condensate constantly flows from condensate inlet pipe 13 through condensate inlet section 24 into condensate outflow passage 22 of fuselage 2, and flows out from condensate return passage 23 to condensate outlet pipe 14 through condensate outlet section 25, so that the condensate that has flowed into fuselage 2 is cooled by seawater passing through inlet cooling pipe 8 as it flows through condensate outflow passage 22 and condensate return passage 23.

[0046] Next, during backwashing, as shown in Figure 7(b), the inlet valve 15 and outlet valve 16 are closed, the extraction valve 51 is opened, and the industrial water supply valve 18 is opened (if the industrial water supply pipe 17 is not connected to the rear header cover 42 (outlet water chamber 6), it is connected and the industrial water supply valve 18 is opened).

[0047] Then, industrial water is supplied to the outlet water chamber 6 at a predetermined water pressure from the industrial water header 19, and then the industrial water is sent through the inlet cooling pipe 8 to the inlet water chamber 5, from which it flows back through the seawater inlet pipe 11 via the seawater inlet section 36 and is extracted from the middle of the seawater inlet pipe 11 (elbow section 11a) via the extraction piping 50.

[0048] Since the discharge pipe 50 is connected to the lower part of the inlet water chamber 5 (the part below the inlet cooling pipe 8), the backwash water (industrial water) is discharged without accumulating in the inlet water chamber 5 during backwashing, and the backwash water (industrial water) that flows into the inlet water chamber 5 from the inlet cooling pipe 8 falls inside the inlet water chamber 5, and then flows so as to fall further inside the seawater inlet pipe 11 via the seawater inlet part 36, and is then discharged from the discharge pipe 50 with momentum from the elbow part 11a of the seawater inlet pipe 11. Therefore, the flow of the backwash water is promoted by dropping the backwash water in addition to the delivery pressure of the backwash water (industrial water) by the pump 20. Therefore, the momentum of the flow of the backwash water (industrial water) flowing through the inlet cooling pipe and the inlet water chamber becomes stronger, so that foreign matter stuck in the inlet cooling pipe or remaining in the inlet water chamber can be pushed out from the seawater inlet part 36 provided at the bottom of the inlet water chamber to the seawater inlet pipe 11, and discharged through the discharge pipe 50. Moreover, since the discharge pipe 50 is connected to the elbow portion 11a midway up the seawater inlet pipe 11, the process pressure of the backwash water and the flow promoting effect caused by the falling backwash water combine to produce a synergistic effect, allowing the process water to be discharged directly from the discharge pipe, thereby making it possible to effectively discharge foreign matter to the outside.

[0049] In the above examples, the extraction pipe 50 is connected to the seawater inlet pipe 11, but the extraction pipe 50 may be connected to a position below the inlet cooling pipe, for example, to the lower end of the inlet water chamber 5, so that the backwash water flowing from the inlet cooling pipe 8 into the inlet water chamber 5 during backwashing is discharged without accumulating in the inlet water chamber 5, and the backwash water flowing from the inlet cooling pipe 8 into the inlet water chamber 5 can be allowed to fall and then discharged via the extraction pipe 50.

[0050] In the above examples, the seawater inlet pipe and seawater outlet pipe are arranged below the inlet water chamber and connected to the inlet water chamber (seawater inlet section 36, seawater outlet section 37) from below. However, in a fluid cooler in which the seawater inlet pipe 11 is connected from above to the seawater inlet section 36 that opens upward from the inlet water chamber 5 and the seawater outlet pipe 12 is connected from above to the seawater outlet section 37 that opens upward from the outlet water chamber 6 as shown in FIG. 8, an extraction piping may be connected to the lower end of the inlet water chamber 5 to obtain a similar effect.

[0051] Furthermore, in the above, examples of condensate coolers 100, 200 that cool condensate have been shown as fluid coolers 1, but a similar configuration can be adopted as long as the cooler uses seawater as a refrigerant and guides seawater introduced into the inlet water chamber 5 to another water chamber via the inlet cooling pipe 8. For example, as shown in FIG. 9, in a two-pass type condenser 300 (FIG. 9(a)) or a one-pass type condenser 400 (FIG. 9(b)), which does not have a body 2 in the heat exchange section and cools steam flowing around the cooling pipe by heat exchange with seawater flowing inside the cooling pipe, similarly to the above configuration example, an extraction pipe 50 may be connected to a position that is closer to the seawater inlet side of the inlet cooling pipe and lower than the inlet cooling pipe 8 (for example, a portion below the inlet water chamber 5 of the seawater inlet pipe 11 and halfway up), and this extraction pipe 50 may be opened and closed by an extraction valve 51. During backwashing, the extraction valve 51 may be opened to allow the backwash water (industrial water) guided to the inlet water chamber 5 through the inlet cooling pipe 8 to fall and then be extracted through the extraction pipe 50.

[0052] The other configurations are similar to those of the condensate cooler, so the same parts are given the same reference numerals and the description is omitted. With this configuration as well, it is possible to obtain the same effect as the backwashing of the condensate cooler shown in FIG. 1 or FIG. [Explanation of symbols]

[0053] 1 Fluid cooler 11 Seawater inlet pipe 11a Elbow part 5 Inlet water chamber 6 outlet water chamber 7 Turnaround Water Room 8 Inlet cooling pipe 10 Heat exchange section 50 Extraction piping 51 Extraction valve 100, 200 Condensate Cooler 300, 400 Condenser

Claims

1. The inlet water chamber is adapted to introduce seawater through a seawater inlet pipe, and an inlet cooling pipe is adapted to move the seawater introduced into the inlet water chamber to another water chamber. The present invention is used in a fluid cooler having a heat exchange section that cools a fluid to be cooled flowing around the inlet cooling pipe by heat exchange with seawater flowing at least inside the inlet cooling pipe, In a backwash system for a fluid cooler, the inlet cooling pipe and the inlet water chamber can be backwashed with backwash water supplied from a downstream side by stopping seawater introduced into the inlet water chamber through the seawater inlet pipe, an industrial water supply pipe that is opened and closed by an industrial water supply valve is connected to the other water chamber, and the industrial water pressurized by the pump can be supplied to the other water chamber by opening the industrial water supply valve; a discharge valve that can be opened and closed by a discharge valve is provided at a position on the seawater inlet side of the inlet cooling pipe and below the inlet cooling pipe, and during backwashing, the industrial water supply valve and the discharge valve are opened to allow the backwash water flowing from the inlet cooling pipe into the inlet water chamber to fall and then be discharged through the discharge pipe.

2. 2. The backwash equipment for a fluid cooler as described in claim 1, wherein the extraction piping is connected to a lower end of the inlet water chamber or to a portion of the seawater inlet pipe below the inlet water chamber.

3. an inlet cooling pipe having one end opening into the inlet water chamber and the other end opening into the turn-around water chamber, for moving seawater introduced into the inlet water chamber to the turn-around water chamber; an outlet cooling pipe having one end opening into the turn-back water chamber and the other end opening into the outlet water chamber, for moving the seawater introduced into the turn-back water chamber to the outlet water chamber; the heat exchange unit cools the cooled fluid flowing around the inlet cooling pipe by heat exchange with seawater flowing in the inlet cooling pipe, and cools the cooled fluid flowing around the outlet cooling pipe by heat exchange with seawater flowing in the outlet cooling pipe, an industrial water supply pipe that is opened and closed by an industrial water supply valve is connected to the turning water chamber, and the industrial water pressurized by the pump can be supplied to the turning water chamber by opening the industrial water supply valve; 3. The backwash facility for a fluid cooler according to claim 1, wherein, during backwashing, the inlet cooling pipe and the inlet water chamber are backwashed with the industrial water supplied to the turn-back water chamber.

4. an inlet cooling pipe having one end opening to the inlet water chamber and the other end opening to the outlet water chamber, for moving seawater introduced into the inlet water chamber to the outlet water chamber; the heat exchanger cools a fluid to be cooled flowing around the inlet cooling pipe by heat exchange with seawater flowing inside the inlet cooling pipe, an industrial water supply pipe that is opened and closed by an industrial water supply valve is connected to the outlet water chamber, and industrial water pumped by a pump can be supplied to the outlet water chamber by opening the industrial water supply valve; 3. The backwash facility for a fluid cooler according to claim 1, wherein, during backwashing, the inlet cooling pipe and the inlet water chamber are backwashed with the industrial water supplied to the outlet water chamber.

5. 5. The backwashing equipment for a fluid cooler as described in any one of claims 1 to 4, characterized in that the heat exchange section has a hollow body that is arranged to pass at least the inlet cooling pipe, and is configured by connecting a cooled fluid inlet pipe through which the cooled fluid flows into the body and a cooled fluid outlet pipe through which the cooled fluid flows out from the body to the peripheral wall of the body.

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