JP2009127966A - Multi-pipe cooler and using method of multi-pipe cooler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-pipe cooler, capable of killing marine organisms adhered to a wall surface, even during operation of the cooler, without stopping the operation or deteriorating the cooling performance, and a using method thereof. <P>SOLUTION: The multi-pipe cooler 1 adapted to carry seawater as a low temperature-side fluid into a cooling pipe 2 includes a water chamber vapor supply pipe 30 which is mounted adjacently to or in contact with at least a water chamber insidewall surface 25 on an seawater inlet side, and directly blows vapor and/or drain that is a condensate of the vapor to the water chamber insidewall surface 25 through a plurality of blowout ports 38 to raise the surface temperature of the water chamber insidewall surface 25 to a temperature sufficient to kill maine organisms without largely raising the temperature of the seawater. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a multitubular cooler that allows seawater to flow as a low-temperature side fluid in a cooling pipe, and can kill marine organisms attached to the wall surface on the water chamber side even when the multitubular cooler is in operation. Further, the present invention relates to a multi-tube cooler that can perform continuous operation over a long period of time without stopping the multi-tube cooler.

  In thermal power plants, including a condenser that cools and condenses the steam discharged from the steam turbine, a hydrogen cooler for turbine generator that cools the generator and cools the hydrogen gas whose temperature has risen, and a turbine that cools turbine oil Seawater is used as a cooling medium for a bearing cooling water cooler that cools in-house cooling water used for bearing cooling water such as oil coolers, boilers, and turbine auxiliary machines. As the bearing cooling water cooler, a multi-tubular cooler, which is a partition wall type heat exchanger, is often used, and it is general to flow seawater into the cooling pipe and flow the in-house cooling water outside the cooling pipe. Seawater that cools the in-house cooling water is taken from the intake channel, and by itself cooling the in-house cooling water, the temperature of the sea water rises and is discharged into the discharge channel. On the other hand, the in-house cooling water is fresh water and circulates between the bearing cooling water cooler and the hydrogen cooler for the turbine generator.

Since the bearing cooling water cooler uses seawater as a cooling medium, when it is operated for a long time, marine organisms such as shellfish contained in the seawater may adhere to the wall surface of the water chamber, etc. is there. For this reason, in the coolers and heat exchangers that use seawater as the cooling medium, countermeasures against marine organisms are one of the issues. The method of injecting chlorine or sodium hypochlorite, the operation is stopped, and the cooler A method for cleaning the inside and a method for preventing the growth of marine organisms by increasing the temperature have been proposed. A method for preventing marine organisms from growing on the wall surface of a water chamber or the like by increasing the temperature is a method that utilizes the fact that marine organisms die in tens of minutes in an atmosphere of 40 ° C. (for example, Patent Documents) 1, Patent Document 2 and Patent Document 3).
JP-A-7-190684 JP 2001-183492 A Japanese Patent Laid-Open No. 10-253271

  The method of injecting chlorine or sodium hypochlorite to prevent the adhesion and growth of marine organisms is not a preferable method from the viewpoint of the environment. The method of stopping the operation and cleaning the inside of the cooler is a reliable method, but it takes time and the operation must be stopped, so it is necessary to stop the power generation itself if a spare device is not provided. is there. The method of increasing the temperature described in Patent Document 1 to Patent Document 3 to prevent the growth of marine organisms is a method of killing marine organisms by supplying warm water or the like to the cooler, but the supply of seawater was stopped. Since it is necessary to carry out in the state, it cannot be carried out while operating the cooler. Therefore, it is necessary to prepare a spare machine and operate while switching the bearing cooling water cooler and supply hot water while the engine is stopped, or supply hot water while the power generation equipment is stopped. These are not limited to the bearing cooling water cooler, and the same applies to other coolers and heat exchangers that use seawater.

  An object of the present invention is to provide a multitubular cooler capable of killing marine organisms adhering to a wall surface without stopping operation and reducing cooling performance even during operation of the cooler and use thereof Is to provide a method.

  The multitubular cooler according to claim 1 is a multitubular cooler for flowing seawater as a low temperature side fluid in the cooling pipe, and is attached so as to be close to or in contact with the side wall surface of the water chamber on the seawater inlet side, The temperature at which marine organisms can be killed without spraying steam and / or condensate of steam from a plurality of jets directly onto the side wall surface of the water chamber, and greatly increasing the surface temperature of the side wall surface of the water chamber without significantly increasing the temperature of the sea water It is characterized by having a water chamber steam supply pipe which is raised up to.

  The multi-tubular cooler according to claim 2 is provided at one end of the trunk part, a water chamber having a seawater inlet part and a seawater outlet part partitioned by a partition plate, and provided at the other end of the trunk part. A multi-tubular cooler that flows seawater as a low-temperature side fluid in a cooling pipe, and has a seawater inlet part and a seawater outlet part. Attached so as to be close to or in contact with the side wall surface of the water chamber on the seawater inlet side and the side wall surface of the water chamber returning the seawater to the seawater outlet portion, steam and / or steam is condensed from a plurality of jet outlets. Having a water chamber steam supply pipe that directly blows the drain on the side wall surface of the water chamber and raises the surface temperature of the side wall surface of the water chamber to a temperature at which marine life can be killed without greatly increasing the temperature of seawater. Features.

  The multitubular cooler according to claim 3, in addition to the above-described configuration, the water outlet of the water chamber steam supply pipe is configured such that the steam discharged from the outlet and / or the drain condensed with the steam is the side wall surface of the water chamber The steam and / or the drain condensed with the steam is ejected so as to move along the water.

  The multitubular cooler according to claim 4 is characterized in that, in addition to the configuration, the water chamber steam supply pipe has a small pipe outer diameter.

  The method for using a multi-tube cooler according to claim 5 is a method for using the multi-tube cooler, wherein the operation of the multi-tube cooler is stopped while the multi-tube cooler is in operation. The steam is intermittently supplied to the water chamber steam supply pipe, and the surface temperature of the side wall surface of the water chamber is increased to a temperature at which marine life can be killed without greatly increasing the temperature of seawater. .

  The multitubular cooler of the present invention is a drain that is condensed from steam and / or steam from a plurality of jet outlets attached to at least close to or in contact with the side wall surface of the water chamber on the seawater inlet side. Since the water chamber steam supply pipe that directly blows water is supplied, steam is supplied to the water chamber steam supply pipe without substantially increasing the seawater temperature, and the water chamber is supplied with the supplied steam, the drain condensed steam, or a mixture thereof. The inner wall surface can be heated. This makes it possible to heat the wall surface on the water chamber side and to kill marine organisms adhering to the wall surface of the water chamber with almost no decrease in cooling performance even when the multi-tube cooler is operating. Therefore, long-term continuous operation is possible.

  The multitubular cooler of the present invention includes a water chamber side wall surface on the sea water inlet portion side of a water chamber having a sea water inlet portion and a sea water outlet portion, and a water chamber side wall surface of a water chamber that returns sea water to the sea water outlet portion. Are provided so as to be close to or in contact with each other, and have a water chamber steam supply pipe that directly blows steam and / or condensate of steam from a plurality of jets onto the side wall surface of the water chamber. By supplying the water, the wall surface on the water chamber side can be heated with the supplied steam, the condensed drain of the steam, or a mixture thereof without substantially increasing the seawater temperature. This makes it possible to heat the wall surface on the water chamber side and to kill marine organisms adhering to the wall surface of the water chamber with almost no decrease in cooling performance even when the multi-tube cooler is operating. Therefore, long-term continuous operation is possible.

  Moreover, according to this invention, the several jet nozzles of the water chamber steam supply pipe with which a multitubular cooler is equipped are the vapor | steam discharged from a jet nozzle, and / or the drain which the vapor | steam condensed moves along a water chamber side wall surface. In this way, steam and / or drain condensed with steam is ejected, so that the side wall surface of the water chamber can be efficiently heated with a small amount of steam, and when the multi-tube cooler is operating. However, the wall surface on the water chamber side can be heated without substantially reducing the cooling performance.

  Further, according to the present invention, the water chamber steam supply pipe provided in the multitubular cooler has a small heat transfer area with seawater because the outer diameter of the pipe is small, and even during operation of the multitubular cooler, It is difficult to cool, and the wall surface on the water chamber side can be more efficiently heated with a small amount of steam.

  FIG. 1 is a cross-sectional view showing a schematic configuration of a multitubular cooler 1 as a first embodiment of the present invention. FIG. 2 is a diagram showing the arrangement of the water chamber steam supply pipe 30, as viewed from the seawater inlet side water chamber 6 toward the cooling pipe 2. 3 is a cross-sectional view taken along the cutting line III-III in FIG.

  The multitubular cooler 1 is a partition wall heat exchanger, and seawater as a cooling medium flows in the cooling pipe 2 and water to be cooled flows outside the cooling pipe 2. The water to be cooled is fresh water. The cooling pipe 2 is composed of a number of cooling pipes and is fixed to fixed tube plates 4 and 5 at both ends of the body 3. A seawater inlet side water chamber 6 and a seawater outlet side water chamber 7 are provided at both ends of the trunk 3, and the trunk 3, the seawater inlet side water chamber 6, and the seawater outlet side water chamber 7 have flanges 8, 9, 10, 11 is connected. Seawater supplied from a seawater inlet pipe 13 provided at the upper part of the seawater inlet side water chamber 6 flows through the cooling pipe 2 and is discharged from a seawater outlet pipe 16 provided at the lower part of the seawater outlet side water chamber 7. .

  Cooled water is introduced into the trunk 3 from the cooled water inlet pipe 17 provided in the lower part of the trunk 3 close to the sea water inlet-side water chamber 6, and exchanges heat with seawater flowing in the cooling pipe 2 to lower the temperature. It is discharged from a cooled water outlet pipe 18 provided at the upper part of the trunk 3 near the seawater outlet side water chamber 7. A plurality of baffle plates 19 are installed in the body 3 so as to be orthogonal to the longitudinal direction of the body 3 to prevent a short path of water to be cooled in the body 3. The seawater inlet pipe 13, the seawater outlet pipe 16, the cooled water inlet pipe 17, and the cooled water outlet pipe 18 are each provided with temperature sensors 20, 21, 22, 23 for measuring the temperature of the fluid, Seawater inlet / outlet temperature and cooling water inlet / outlet temperature can be measured.

Further, the multi-tube cooler 1 is provided with a water chamber steam supply pipe 30 for heating the inner wall surface 25 of the sea water inlet side water chamber 6. One end of the water chamber steam supply pipe 30 penetrates the sea water inlet side water chamber 6 and is connected to an electric valve 32 of the outside 31. The motor-operated valve 32 is connected to a steam supply device (not shown) via a steam pipe 33. The water chamber steam supply pipe 30 has a header 34 for supplying steam, and a plurality of branch pipes 36 (36a, 36b, 36c, 36d, 36e, 36f, 36g) connected to the header 34 and heating the inner wall surface 25.

  Each branch pipe 36 has a ring shape, and each branch pipe 36 is attached so as to contact the inner wall surface 25. Each branch pipe 36 is provided with a plurality of through holes 38 only in the direction of the inner wall surface 25 so as to be in contact with the inner wall surface 25, and steam and / or high-temperature drain condensed from the steam is ejected from the through holes 38. . However, the through hole 38 is not provided in the vicinity of the seawater inlet pipe 13. When steam is supplied to such a water chamber steam supply pipe 30, the steam or the high-temperature drain that is cooled and condensed by the seawater ejected from the through hole 38 of the branch pipe 36 or seawater, and the mixture of these and seawater, After colliding with the wall surface 25, it moves along the inner wall surface 25 to heat the inner wall surface 25.

  Although the number of branch pipes 36 constituting the water chamber steam supply pipe 30 and the number of through holes 38 drilled therein is not particularly limited, it is preferable that the number of branch pipes and through holes is large. As shown in a use example described later, this multitubular cooler 1 generates steam and / or high-temperature drain condensed steam on the inner wall surface 25 of the seawater inlet side water chamber 6 during operation of the multitubular cooler 1. Heat by spraying. Since the sprayed steam and / or the drain condensed with steam acts to heat the inner wall surface 25 and raise the seawater temperature, using a large amount of steam to heat the inner wall surface 25 lowers the cooling performance. This is not preferable. If the inner wall surface 25 is to be widely heated with a small number of branch pipes 36, it is necessary to increase the amount of steam and / or drain condensed with steam that is ejected from one branch pipe. In this case, the jetted steam and / or a part of the high-temperature drain condensed with the steam diffuses without heating the inner wall surface 25 and is directly mixed with seawater, which is not preferable. The number of branch pipes 36 constituting the water chamber steam supply pipe 30 is increased, and the amount of steam discharged from one branch pipe and / or the high-temperature drain condensed with the steam is reduced to reduce the inner wall surface 25. It can be used efficiently for heating. The number of through-holes 38 can be considered similarly.

  Furthermore, it is preferable that the outer diameter of one branch pipe 36 is smaller because heat radiation to the seawater through the pipe wall of the branch pipe 36 is reduced and the amount of steam supplied is reduced. Further, it is preferable to use a material having low thermal conductivity for the branch pipe 36 because heat radiation to seawater through the pipe wall of the branch pipe 36 is reduced and the amount of steam to be supplied can be reduced. However, since marine organisms also adhere to the outer wall surface of the water chamber steam supply pipe 30 itself located in the sea water inlet side water chamber 6 including the branch pipe 36, the temperature of the outer wall surface of the water chamber steam supply pipe 30 itself is set to the ocean. It needs to be at a temperature that kills the organism. It is necessary to determine the thermal conductivity of the material of the water chamber steam supply pipe 30 including this point.

  An example of how to use the multitubular cooler 1 will be shown. The multitubular cooler 1 of the present invention supplies steam to the water chamber steam supply pipe 30 while the multitubular cooler 1 is in operation, that is, in a state in which seawater that is a low-temperature side fluid and fresh water that is a high-temperature side fluid flow. Then, the inner wall surface 25 of the sea water inlet side water chamber 6 is heated to kill marine organisms attached to the inner wall surface 25. It is not necessary to supply the steam all the time during the operation of the multitubular cooler 1, and it may be performed periodically or at a time when marine life is likely to grow. The heating temperature and heating time of the wall surface necessary for killing marine organisms are the same as in the past. A method of heating a wall surface with steam or hot water to heat and kill marine organisms adhering to the wall surface is conventionally known. However, the conventional method is performed with the cooler stopped. The invention is characterized in that during operation, steam and / or high-temperature drain condensed steam is sprayed on the inner wall surface 25 of the sea water inlet side water chamber 6 to heat the inner wall surface 25.

  When the water chamber steam supply pipe 30 is provided so as to be in contact with the inner wall surface 25 of the sea water inlet side water chamber 6 and the steam is injected at a high speed from a position very close toward the inner wall surface 25, the steam and the steam High-temperature drain cooled or condensed by seawater or a mixture thereof, and a mixture of these and seawater are sprayed onto the inner wall surface 25. In the vicinity of the inner wall surface 25 of the seawater inlet-side water chamber 6, the inner wall surface 25 can be efficiently heated with a small amount of steam because the flow rate of the seawater is slow and the seawater is not easily replaced. The amount of steam to be used is overwhelmingly small compared to the flow rate of seawater, and the vicinity of the inner wall surface 25 of the seawater inlet-side water chamber 6 has a slow flow rate of seawater and it is difficult for the seawater to be replaced. The inner wall surface 25 of the seawater inlet side water chamber 6 can be heated without greatly increasing the temperature of the circulating seawater, and marine organisms adhering thereto can be killed. Also, the through-hole 38 is provided so that the steam ejected from the through-hole 38, the high-temperature drain condensed by cooling the surrounding seawater or the mixture thereof, and the mixture of these and the seawater move along the inner wall surface 25. Thus, the inner wall surface 25 of the seawater inlet-side water chamber 6 can be efficiently heated with a smaller amount of steam. From the above, the present invention can be suitably used for a bearing cooling water cooler used in a power plant.

  Marine organisms tend to adhere to and grow on the walls of water chambers where the flow of seawater is slow, but are unlikely to adhere to cooling pipes with high flow rates. For this reason, it can be said that it is efficient to install a steam supply pipe in the water chamber and spray the steam and / or high-temperature drain condensed with the steam directly onto the wall surface of the water chamber to kill marine organisms. When marine organisms adhere and grow on the inner wall surface 25 of the seawater inlet side water chamber 6, the flow of seawater may be hindered or the grown marine organisms may peel from the inner wall surface 25 and block the cooling pipe 2. A steam supply pipe 30 is installed in the water chamber 6. In the present embodiment, a steam supply pipe for heating the inner wall surface of the seawater outlet side water chamber 7 is not provided, but it is needless to say that a steam supply pipe for heating the inner wall may be provided in the seawater outlet side water chamber 7. is there.

  4 is a cross-sectional view showing a branch pipe 40d which is a first modification of the branch pipe 36d of the water chamber steam supply pipe 30 shown in FIG. The same members and the same portions as the branch pipes 36d of the water chamber steam supply pipe 30 shown in FIG. The branch pipe 40d shown in FIG. 4 is a branch pipe constituting the water chamber steam supply pipe, and excludes the through-hole 42 that is a hole formed in the branch pipe 40d and / or a drain outlet for the condensed steam. For example, it is the same as the branch pipe 36d. In the branch pipe 36d shown in FIG. 3, a through hole 38 substantially the same as the inner diameter of the branch pipe is formed so as to face the inner wall surface 25. One is drilled on the left and right at a position of 10 ° to 50 ° from the directly facing position. Further, the diameter of the through hole 42 drilled in the branch pipe 40d is smaller than the through hole 38 drilled in the branch pipe 36d shown in FIG. By providing the through hole 42 in this manner, the steam ejected from the through hole 42 and / or the drain condensed with the steam becomes easier to move along the inner wall surface 25, and the inner wall surface 25 can be efficiently moved with a small amount of steam. Can be heated.

  FIG. 5 is a cross-sectional view showing a branch pipe 44d which is a second modification of the branch pipe 36d of the water chamber steam supply pipe 30 shown in FIG. The same members and the same portions as the branch pipes 36d of the water chamber steam supply pipe 30 shown in FIG. The branch pipe 44d shown in FIG. 5 is a branch pipe constituting the water chamber steam supply pipe, and unlike the branch pipes 36 and 40 shown in FIG. 3 or 4, the branch pipe 44d is slightly spaced from the inner wall surface 25. It is attached in a state having δ. Further, the through hole 46 drilled in the branch pipe 44d is smaller than the through hole 38 drilled in the branch pipe 36d shown in FIG. Since the steam ejected from the through hole 46 and / or the drain condensed with the steam moves along the inner wall surface 25, the inner wall surface 25 can be efficiently heated with a small amount of steam.

  FIG. 6 is a cross-sectional view showing a schematic configuration of a multitubular cooler 50 as a second embodiment of the present invention. FIG. 7 is a plan view showing the arrangement of the seawater inlet side water chamber steam supply pipe 70. FIG. 8 is an enlarged view of part A of FIG. 6, and the water chamber lid steam supply pipe 75 that heats the inner wall surface 59 of the lower half of the water chamber lid 58 in the seawater inlet side water chamber steam supply pipe 70 is watered. It is the figure seen from the chamber lid 58 to the cooling pipe 2 side direction. FIG. 9 shows the installation procedure of the inner wall steam supply pipe for heating the inner wall surface 57 of the lower water chamber 52 and the partition plate steam supply pipe for heating the surface 60 of the partition plate 55 in the seawater inlet-side water chamber steam supply pipe 70. It is a fragmentary sectional view. The same members and the same places as those in the multitubular cooler 1 of the first embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The multitubular cooler 50 is a partition wall heat exchanger, and the seawater as a cooling medium flows inside the cooling pipe 2 and fresh water to be cooled flows outside the cooling pipe 2 as in the first embodiment. Although it is the same as the multitubular cooler 1, the flow of seawater is different. The water chamber attached to one end of the trunk 3 is divided into two vertically by a partition plate 55, and the seawater inlet pipe 13 is provided in the lower water chamber 52 and the seawater outlet pipe 16 is provided in the upper water chamber 54. The seawater supplied to the lower water chamber 52 through the seawater inlet pipe 13 flows in the lower half of the cooling pipe 2 fixed to the trunk 3, and the flow is reversed in the water chamber at the other end to be fixed to the trunk 3. After flowing through the half cooling pipe 2 and collected in the upper water chamber 54 on the seawater inlet side, it is discharged from the seawater outlet pipe 16. A water chamber having a lower water chamber 52 and an upper water chamber 54 is a seawater inlet side water chamber 51, and a water chamber that returns seawater sent from the lower water chamber 52 to the upper water chamber 54 is a seawater return side water chamber 53.

  The multitubular cooler 50 heats the inner wall surface 57 of the lower water chamber 52, the inner wall surface 59 of the lower half of the water chamber lid 58, and the surface 60 of the partition plate 55 in the lower water chamber 52 on the seawater inlet side. The seawater inlet side water chamber steam supply pipe 70 is attached. Similarly, a seawater return side water chamber steam supply pipe 90 for heating the inner wall surface of the seawater return side water chamber 53 is attached. In the multitubular cooler 1 shown in the first embodiment, the steam supply pipe 30 is attached only in the seawater inlet-side water chamber 6, but in the multitubular cooler 50, the seawater inlet-side water chamber 51. Since the seawater sent from the lower water chamber 52 is reversed in the seawater return side water chamber 53 and flows in the cooling pipe 2, the seawater return side water is prevented so that the grown marine organisms are separated from the wall surface and do not block the cooling pipe. A steam supply pipe 90 is also installed in the chamber 53. The seawater inlet-side water chamber steam supply pipe 70 and seawater return-side water chamber steam supply pipe 90 shown in the second embodiment are attached in the same manner as the seawater inlet-side water chamber 6 of the multitubular cooler 1 shown in the first embodiment. This is basically the same as the water chamber steam supply pipe 30 provided in.

  One end of the seawater inlet-side water chamber steam supply pipe 70 passes through the water chamber lid 58 and is connected to an electric valve 72 outside the lower water chamber 52. The motor-operated valve 72 is connected to a steam supply device (not shown) via a steam pipe 73. The seawater inlet-side water chamber steam supply pipe 70 is connected to the header 74 for supplying steam to each part, a water chamber lid steam supply pipe 75 for heating the inner wall surface 59 of the lower half of the water chamber lid 58, and a lower water chamber. The inner wall steam supply pipe for heating the inner wall surface 57 of 52 and the partition plate steam supply pipe for heating the surface 60 of the partition plate 55 are provided.

  The lower half of the water chamber lid 58 has a semicircular shape when viewed from the cooling pipe 2 side, and the water chamber lid steam supply pipe 75 for heating the inner surface 59 of the water chamber lid 58 also has a plurality of semicircular shapes. Branch pipe 76 (76a, 76b, 76c, 76d). The semicircular branch pipes 76 are arranged concentrically, and each branch pipe 76 is connected to branch pipes 86a and 86i of partition plate steam supply pipes that heat the surface 60 of the partition plate 55, and through these branch pipes 86a and 86i. Steam is supplied. Each branch pipe 76 is provided with a plurality of through holes 78 only in the direction of the water chamber lid 58, and steam and / or high-temperature drain condensed steam is ejected from the through holes 78. Each branch pipe 76 is attached so as to be in contact with the water chamber lid 58, and the through hole 78 is also in contact with the water chamber lid 58 in the same manner as the through hole 38 formed in the branch pipe 36d shown in FIG. Yes. When steam is supplied to the water chamber lid steam supply pipe 75, the steam or the high-temperature drain condensed by cooling with the steam or seawater ejected from the through-hole 78 of the branch pipe 76, and the mixture of these and seawater, After colliding with the water chamber lid 58, it moves along the water chamber lid 58 to heat the surface 59 of the water chamber lid 58.

  The partition plate steam supply pipes for heating the surface 60 of the partition plate 55 are straight pipe branch pipes 86 (86a, 86b, 86c, 86d, 86e, 86f, 86g, 86h) installed in the direction of the cooling pipe 2. , 86i, 86j, 86k, 86l, 86m, 86n, 86o, 86p), and each branch pipe 86 has a large number of penetrations through which steam and / or hot condensate condensed with steam is ejected only in the direction of the partition plate 55. A hole 88 is formed. The branch pipe 86 is connected to a header 74 installed immediately below the partition plate 55, and jets steam supplied through the header 74 and / or high-temperature drain condensed with steam toward the partition plate 55. Each branch pipe 86 is attached so as to be in contact with the partition plate 55, similarly to the branch pipe 76 that heats the water chamber lid 58, and the through hole 88 is also in contact with the surface 60 of the partition plate 55.

  The inner wall steam supply pipe for heating the inner wall surface 57 of the lower water chamber 52 also includes a plurality of branch pipes 82 (82a, 82b, 82c, 82d, 82e, 82f, 82g), and each branch pipe 82 heats the partition plate 55. Each branch pipe 86 is connected, and steam is supplied through the branch pipe 86. The plurality of branch pipes 82 have a semicircular shape, are attached so as to be in contact with the inner wall surface 57 of the lower water chamber 52, and steam and / or the inner wall surface 57 of the lower water chamber 52 through a plurality of through holes 84. Spray hot condensate with condensed steam.

  One end of the seawater return side water chamber steam supply pipe 90 penetrates the seawater return side water chamber 53 and is connected to the motor-operated valve 92 of the outside 31. The motor-operated valve 92 is connected to a steam supply device (not shown) via a steam pipe 93. The seawater return side water chamber steam supply pipe 90 has a header 94 for supplying steam and a plurality of branch pipes 96 (96a, 96b, 96c, 96d, 96e, 96f, 96g) connected to the header 94 and heating the inner wall surface. . Since the seawater return side water chamber steam supply pipe 90 has the same configuration as the water chamber steam supply pipe 30 shown in the first embodiment, the description thereof is omitted. Moreover, the usage method of the multitubular cooler 50 shown in 2nd Embodiment is the same as the multitubular cooler 1 shown in 1st Embodiment, and the effect is also the same. Furthermore, it is the same as the multitubular cooler 1 shown in the first embodiment that a steam supply pipe may be attached to the upper water chamber 54 which is the seawater outlet side water chamber.

  The multitubular cooler 1 shown in the first embodiment and the multitubular cooler 50 shown in the second embodiment are different in the flow of seawater, and the attachment position of the water chamber steam supply pipe is different accordingly. However, both have a water chamber steam supply pipe that heats the inner wall surface of the water chamber that feeds seawater into the cooling pipe. Furthermore, by attaching the branch pipe constituting the water chamber steam supply pipe and the through hole formed in the branch pipe so as to be in contact with the wall surface or close to the wall surface, the seawater temperature is not significantly increased with a small amount of steam. The inner wall surface can be heated, and marine organisms adhering to the inner wall surface can be killed. The multitubular cooler is not limited to the type shown in the first and second embodiments, and the present invention can also be used for a multitubular heat exchanger.

1 is a cross-sectional view showing a schematic configuration of a multitubular cooler 1 as a first embodiment of the present invention. It is a figure which shows arrangement | positioning of the water chamber steam supply pipe | tube 30 of FIG. 1, Comprising: It is the figure seen from the seawater inlet side water chamber 6 to the cooling pipe 2 side direction. It is sectional drawing cut | disconnected by the cutting line III-III of FIG. It is sectional drawing which shows the branch pipe 40d which is the 1st modification of the branch pipe 36d of the water chamber steam supply pipe 30 shown in FIG. It is sectional drawing which shows the branch pipe 44d which is the 2nd modification of the branch pipe 36d of the water chamber steam supply pipe 30 shown in FIG. It is sectional drawing which shows schematic structure of the multitubular cooler 50 as 2nd Embodiment of this invention. It is a top view which shows arrangement | positioning of the seawater inlet side water chamber steam supply pipe 70 of FIG. FIG. 7 is an enlarged view of part A of FIG. 6, wherein a water chamber lid steam supply pipe 75 for heating an inner wall surface 59 of the lower half of the water chamber lid 58 in the seawater inlet side water chamber steam supply pipe 70 is connected to the water chamber lid 58. It is the figure seen in the cooling pipe 2 side direction. 6 shows the installation procedure of the inner wall steam supply pipe for heating the inner wall surface 57 of the lower water chamber 52 and the partition plate steam supply pipe for heating the surface 60 of the partition plate 55 in the seawater inlet side water chamber steam supply pipe 70 of FIG. It is sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Multi-tube type cooler 2 Cooling pipe 6 Sea water inlet side water chamber 25 Sea water inlet side water chamber wall surface 30 Water chamber steam supply pipe 34 Header 36 Branch pipe 38 Through hole 40 Branch pipe 42 Through hole 44 Branch pipe 46 Through hole 50 Pipe cooler 51 Sea water inlet side water chamber 52 Lower water chamber 53 Sea water return side water chamber 54 Upper water chamber 55 Partition plate 57 Lower water chamber wall surface 58 Water chamber lid 59 Water chamber lid lower half inner wall surface 60 Partition plate surface 70 Sea water Inlet side water chamber steam supply pipe 74 Header 75 Water chamber lid steam supply pipe 76 Branch pipe 78 Through hole 82 Branch pipe 84 Through hole 86 Branch pipe 88 Through hole 90 Seawater return side water chamber steam supply pipe 94 Header 96 Branch pipe

Claims (5)

  A multi-tube cooler that flows seawater as a low-temperature side fluid in a cooling pipe, and is attached so as to be close to or in contact with the side wall surface of the water chamber on the seawater inlet side, and steam and / or steam is condensed from a plurality of jet outlets. It has a water chamber steam supply pipe that sprays drain directly on the side wall surface of the water chamber and raises the surface temperature of the side wall surface of the water chamber to a temperature at which marine life can be killed without greatly increasing the temperature of seawater. Multi-tube cooler.   A water chamber provided at one end of the trunk and having a seawater inlet and a seawater outlet separated by a partition plate, and a water chamber provided at the other end of the trunk and sending seawater sent from the seawater inlet to the seawater outlet A multi-tube type cooler that flows seawater as a low-temperature side fluid in the cooling pipe, and the water chamber side wall surface on the seawater inlet side of the water chamber having the seawater inlet part and the seawater outlet part, and seawater Attached so as to be close to or in contact with the side wall surface of the water chamber of the water chamber to be returned to the seawater outlet part, steam and / or condensate of steam condensed from a plurality of outlets is directly blown onto the side wall surface of the water chamber, A multi-tubular cooler having a water chamber steam supply pipe for increasing the surface temperature of the side wall surface of the water chamber to a temperature at which marine organisms can be killed without greatly increasing the temperature of seawater.   The steam outlet of the water chamber steam supply pipe ejects the steam and / or the steam condensed drain so that the steam and / or the drain condensed the steam moves along the side wall surface of the water chamber. The multitubular cooler according to claim 1 or 2, wherein the multitubular cooler is provided.   The multitubular cooler according to any one of claims 1 to 3, wherein the water chamber steam supply pipe has a small pipe outer diameter.   Without stopping the operation of the multi-tube cooler during operation of the multi-tube cooler, steam is intermittently supplied to the water chamber steam supply pipe, and the water chamber without greatly increasing the temperature of seawater. The method of using a multitubular cooler according to any one of claims 1 to 4, wherein the surface temperature of the inner wall surface is increased to a temperature at which marine organisms can be killed.

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