JP2013217711A - Cooling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling apparatus capable of cooling a medium of a secondary cooling system without utilizing water.SOLUTION: The cooling apparatus includes: an inflow pipe for guiding a medium circulating in a secondary cooling system of a nuclear facility; an air cooler including a heat exchanger having a plurality of fin tubes for circulating the medium in the inside and an air blower arranged on the underside of the heat exchanger in a vertical direction to cool the medium supplied from the inflow pipe; and an outflow pipe for guiding the medium cooled by the air cooler to the secondary cooling system. A face of the heat exchanger opposed to the air blower is projected to the upper side in the vertical direction.

Description

  The present invention relates to a cooling device that acquires heat generated in a nuclear reactor by heat exchange, and more particularly to a cooling device of a secondary cooling system.

  In a nuclear facility with a nuclear reactor, the primary cooling system obtains heat generated by the reactor through heat exchange, the secondary cooling system obtains heat obtained by the primary cooling system through heat exchange, and the secondary cooling system Electricity is generated by converting the acquired thermal energy into electrical energy. Specifically, in the secondary cooling system, a fluid is circulated, and electricity is generated by turning the fluid into a gas with the heat acquired by heat exchange and rotating the turbine with the gas. In the secondary cooling system, the medium after turning into a gas and rotating the turbine is cooled by a cooling device (heat is removed) to become a liquid, and the liquid is used for heat exchange with the primary cooling system, thereby Can be circulated. As a cooling device of the secondary cooling system, seawater or the like is circulated, and heat exchange is performed between the seawater and the secondary cooling system medium, thereby cooling the secondary cooling system medium. Here, although it is not a cooling device which cools the medium of a secondary cooling system, there is also an air cooling type cooler shown in patent documents 1 as a cooler which cools a heat exchanger tube which a medium distributes.

JP-A-9-239230

  At nuclear facilities, heat is removed using water such as seawater and fresh water, but there are cases where water cannot be used due to various problems.

  Then, this invention makes it a subject to provide the cooling device which can cool the medium of a secondary cooling system, without utilizing water.

  The cooling device of the present invention includes an inflow pipe that guides a medium that circulates through a secondary cooling system of a nuclear facility, a heat exchanger that includes a plurality of fin tubes that circulate the medium therein, and a vertically lower side of the heat exchanger. An air cooler that cools the medium supplied from the inflow pipe, and an outflow pipe that guides the medium cooled by the air cooler to the secondary cooling system. The surface of the heat exchanger facing the blower is convex upward in the vertical direction.

  Moreover, it is preferable that the said heat exchanger is a reverse U-order shape which the surface which faces the said air blower combined the surface parallel to two said said perpendicular directions, and a surface parallel to a horizontal direction.

  Moreover, it is preferable that the said air cooler further has a baffle plate arrange | positioned between the said heat exchanger and the said air blower.

  Moreover, it is preferable that the said baffle plate is arrange | positioned along the surface which faces the said air blower of the said heat exchanger.

  Moreover, it is preferable that the said baffle plate is a plate-shaped member in which the some opening was formed, and a diameter becomes large as the said some opening goes to the said vertical direction upper side.

  In addition, the air cooler further includes a rectifying plate disposed between the heat exchanger and the blower, and the heat exchanger has a cross-sectional shape of a surface facing the blower that is vertically upward. It is preferable that the bottom of the convex triangle is removed.

  Moreover, it is preferable that the said baffle plate is arrange | positioned with the shielding part which shields air in at least one part right above the said air blower.

  Moreover, it is preferable that the said air cooler further has a blower which is arrange | positioned at the vertical direction upper side of the said heat exchanger, and draws in and discharges the air which passed the said heat exchanger.

  Moreover, it is preferable that the said air blower is a propeller fan.

  According to the cooling device of the present invention, the medium of the secondary cooling system can be cooled using air.

FIG. 1 is a schematic configuration diagram schematically showing a nuclear facility provided with a cooling device according to the present embodiment. FIG. 2 is a schematic configuration diagram schematically illustrating the air cooler of the cooling device according to the present embodiment. FIG. 3 is a front view of the air cooler shown in FIG. FIG. 4 is a schematic configuration diagram of the heat exchanger shown in FIG. 3 as viewed from the A direction. FIG. 5 is a schematic configuration diagram schematically illustrating the fin tube of the heat exchanger according to the present embodiment. 6 is a cross-sectional view taken along line BB in FIG. FIG. 7 is a schematic configuration diagram schematically illustrating an air cooler of a cooling device according to another embodiment. FIG. 8 is a front view of the air cooler shown in FIG. FIG. 9 is a schematic configuration diagram schematically illustrating a rectifying plate of the air cooler. FIG. 10 is a schematic configuration diagram schematically illustrating an air cooler of a cooling device according to another embodiment. FIG. 11 is a front view of the air cooler shown in FIG. FIG. 12 is a schematic configuration diagram schematically showing a current plate of the air cooler. FIG. 13 is a schematic configuration diagram schematically illustrating an air cooler of a cooling device according to another embodiment.

  Hereinafter, a cooling device according to the present invention will be described with reference to the accompanying drawings. The present invention is not limited to the following examples. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a schematic configuration diagram schematically showing a nuclear facility provided with a cooling device according to the present embodiment. In the nuclear facility 1 shown in FIG. 1, for example, a pressurized water reactor (PWR) is used as the nuclear reactor 5. A nuclear facility 1 using this pressurized water reactor 5 is composed of a primary cooling system 3 including the nuclear reactor 5 and a secondary cooling system 4 that exchanges heat with the primary cooling system 3. The primary coolant flows through the secondary cooling system 4, and the secondary coolant (medium) flows through the secondary cooling system 4.

  The primary cooling system 3 includes a nuclear reactor 5 and a steam generator 7 connected to the nuclear reactor 5 via a coolant pipe 6a serving as a cold leg and a coolant pipe 6b serving as a hot leg. Further, a pressurizer 8 is interposed in the coolant pipe 6b serving as a hot leg, and a coolant pump 9 is interposed in the coolant pipe 6a serving as a cold leg. The reactor 5, the coolant pipes 6 a and 6 b, the steam generator 7, the pressurizer 8, and the coolant pump 9 are accommodated in the reactor containment vessel 10.

  As described above, the nuclear reactor 5 is a pressurized water nuclear reactor, and its interior is filled with a primary coolant. A large number of fuel assemblies 15 are accommodated in the nuclear reactor 5, and a large number of control rods 16 for controlling the nuclear fission of the fuel assemblies 15 are provided in the fuel assemblies 15 so that they can be inserted and removed. The control rod 16 is driven in the insertion / removal direction with respect to the fuel assembly 15 by the control rod driving device 17. When the control rod 16 is inserted into the fuel assembly 15 by the control rod driving device 17, the nuclear reaction in the fuel assembly 15 is reduced and stopped. On the other hand, when the control rod 16 is pulled out by the control rod driving device 17, the nuclear reaction in the fuel assembly 15 increases and becomes a critical state. The control rod driving device 17 is configured to insert the control rod 16 into the fuel assembly 15 when the supply of electric power is cut off and the electric power is lost.

  When the fuel assembly 15 is fissioned while controlling the fission reaction by the control rod 16, thermal energy is generated by the fission. The generated thermal energy heats the primary coolant, and the heated primary coolant is sent to the steam generator 7 via the coolant piping 6b serving as a hot leg. On the other hand, the primary coolant sent from the steam generator 7 via the coolant pipe 6 a serving as a cold leg flows into the reactor 5 and cools the reactor 5.

  The pressurizer 8 interposed in the coolant pipe 6b serving as a hot leg suppresses boiling of the primary coolant by pressurizing the primary coolant that has become hot. Further, the steam generator 7 heat-exchanges the primary coolant that has become high temperature and high pressure with the secondary coolant, thereby evaporating the secondary coolant to generate steam, and the primary coolant that has become high temperature and high pressure. Cooling material is cooling. Each coolant pump 9 circulates the primary coolant in the primary cooling system 3, and sends the primary coolant from each steam generator 7 to the reactor 5 through the coolant pipe 6 a serving as a cold leg and performs primary cooling. The material is sent from the nuclear reactor 5 to each steam generator 7 through a coolant pipe 6b serving as a hot leg.

  Here, a series of operations in the primary cooling system 3 of the nuclear facility 1 will be described. When the primary coolant is heated by the thermal energy generated by the nuclear fission reaction in the nuclear reactor 5, each heated primary coolant is generated by each coolant pump 9 via the coolant pipe 6b that becomes a hot leg. Sent to the vessel 7. The high-temperature primary coolant that passes through the coolant pipe 6b serving as a hot leg is pressurized by the pressurizer 8 to suppress boiling, and flows into each steam generator 7 in a state of high temperature and pressure. The high-temperature and high-pressure primary coolant that has flowed into each steam generator 7 is cooled by exchanging heat with the secondary coolant, and the cooled primary coolant is a coolant pipe that becomes a cold leg by each coolant pump 9. It is sent to the nuclear reactor 5 through 6a. And the reactor 5 is cooled because the cooled primary coolant flows into the reactor 5. That is, the primary coolant is circulated between the nuclear reactor 5 and the steam generator 7. The primary coolant is light water used as a coolant and a neutron moderator.

  The secondary cooling system 4 includes a turbine 22 connected to each steam generator 7 through a steam pipe 21, a condenser 23 connected to the turbine 22, a condenser 23, and each steam generator 7. And a water supply pump 24 interposed in the water supply pipe 26 to be connected. A generator 25 is connected to the turbine 22.

  Here, a series of operations in the secondary cooling system 4 of the nuclear facility 1 will be described. When steam flows from each steam generator 7 into the turbine 22 via the steam pipe 21, the turbine 22 rotates. When the turbine 22 rotates, the generator 25 connected to the turbine 22 generates power. Thereafter, the steam flowing out from the turbine 22 flows into the condenser 23. The condenser 23 has a cooling pipe 27 disposed therein, and one of the cooling pipes 27 is connected to a water intake pipe 28 for supplying cooling water (for example, seawater). Is connected to a drain pipe 29 for draining the cooling water to the water discharge channel. The condenser 23 cools the steam flowing in from the turbine 22 by the cooling pipe 27, thereby returning the steam to a liquid. The secondary coolant that has become liquid is sent to each steam generator 7 via a water supply pipe 26 by a water supply pump 24. The secondary coolant sent to each steam generator 7 becomes steam again by exchanging heat with the primary coolant in each steam generator 7.

  A cooling device 40 is connected to the secondary cooling system 4. The cooling device 40 is a cooling system of a different system from the above-described flow for rotating the above-described turbine 22 of the secondary cooling system 4. The cooling device 40 is a preliminary cooling system that cools the secondary coolant of the secondary cooling system 4 when the cooling water cannot be cooled. The operation of the cooling device 40 is controlled by the control device 41.

  The cooling device 40 includes an inflow pipe 42, an outflow pipe 44, on-off valves 46 and 48, a pump 49, and an air cooler 50. The inflow pipe 42 is a pipe that guides the secondary coolant in the liquid state (water) of the steam generator 7 to the air cooler 50. The outflow pipe 44 is a pipe that guides the secondary coolant cooled by the air cooler 50 to the steam generator 7. The on-off valve 46 is disposed in the inflow pipe 42, and switches between opening and closing of the inflow pipe 42. The on-off valve 46 is closed so that the secondary coolant of the steam generator 7 flows into the air cooler 50. The secondary coolant of the steam generator 7 can flow into the air cooler 50 by being suppressed and opened. The on-off valve 48 is disposed in the outflow pipe 44, and switches between opening and closing of the outflow pipe 44. The on-off valve 48 is closed so that the secondary coolant of the air cooler 50 flows into the steam generator 7. The secondary coolant of the air cooler 50 can be made to flow into the steam generator 7 by being suppressed and opened. The pump 49 is installed in the outflow pipe 44. The pump 49 circulates the secondary coolant flowing in the cooling device 40 with the steam generator 7 by sending the secondary coolant in the outflow pipe 44 to the steam generator 7. The air cooler 50 blows air to the secondary coolant guided by the inflow pipe 42 and heat-exchanges between the air and the secondary coolant to cool the secondary coolant. It is. The structure of the air cooler 50 will be described later.

  The cooling device 40 is configured as described above, and by opening the on-off valves 46 and 48 and driving the pump 49, the steam generator 7, the inflow pipe 42, the air cooler 50, the outflow pipe 44, the steam The secondary coolant is circulated in the order of the generator 7. The cooling device 40 cools the circulating secondary coolant with the air cooler 50. Thereby, the secondary coolant in the steam generator 7 can be cooled, and the primary coolant can be continuously cooled by the secondary coolant.

  Next, the structure of the air cooler 50 is demonstrated using FIGS. 2-6. FIG. 2 is a schematic configuration diagram schematically illustrating the air cooler of the cooling device according to the present embodiment. FIG. 3 is a front view of the air cooler shown in FIG. FIG. 4 is a schematic configuration diagram of the heat exchanger shown in FIG. 3 as viewed from the A direction. FIG. 5 is a schematic configuration diagram schematically illustrating the fin tube of the heat exchanger according to the present embodiment. 6 is a cross-sectional view taken along line BB in FIG.

  As shown in FIG. 2, the air cooler 50 includes a support base 60, a blower 62, and a heat exchange unit 64. The support base 60 includes a plurality of pillars installed on the ground and a frame supported by the pillars. Since the frame is supported by the pillar, the support base 60 is positioned at a predetermined height from the ground. That is, in the support base 60, a gap is formed between the frame and the ground. An inflow pipe 42 and an outflow pipe 44 are connected to the support base 60. The support base 60 is provided with a pipe for connecting the inflow pipe 42, the outflow pipe 44, and the heat exchange unit 64. The pipe connects the inflow pipe 42 and the heat exchange unit 64. The piping connects the outflow pipe 44 and the heat exchange unit 64.

  The blower 62 is installed inside the frame of the support base 60. That is, the blower 62 is disposed at a position that is a predetermined height from the ground. In the air cooler 50 of the present embodiment, two blowers 62 are arranged inside the frame of the support base 60. In addition, the air cooler 50 should just be equipped with the at least 1 air blower 60, and the number is not limited. The blower 62 is a propeller fan and discharges an air flow upward in the vertical direction. By using the blower 62 as a propeller fan, a large volume of air can be supplied with a simple configuration. Further, by using a propeller fan, it can be easily attached to the support base 60.

  The heat exchange unit 64 is arranged on the upper surface of the support base 60, that is, on the upper side in the vertical direction of the blower 62. The heat exchange unit 64 includes a plurality of heat exchangers 66. As shown in FIG. 2, the heat exchange unit 64 of the present embodiment includes six heat exchangers 66. The heat exchanger 66 has a shape in which a surface facing the blower 62, that is, a surface on which an air flow discharged from the blower 62 is incident is convex upward in the vertical direction. The heat exchanger 66 of the present embodiment has a shape in which surfaces extending in the vertical direction are connected to both ends of a surface extending in the horizontal direction, that is, a shape in which the cross section is an inverted U-shape. The heat exchanger 66 has a shape in which a portion that is an inverted U-shape extends in one direction. In the heat exchanger 66, the front and rear surfaces of the U-shaped opening in the extending direction are closed by a plate-like member.

  Further, in the heat exchange unit 64, three heat exchangers 66 are arranged in a direction in which inverted U-shaped sections are arranged in parallel, and two are arranged so that inverted U-shaped sections are connected to each other. . That is, in the heat exchange unit 64, six heat exchangers 66 are arranged in a 2 × 3 matrix. Further, in the heat exchanger unit 64, the heat exchanger 66 and the heat exchanger 66 are arranged at a predetermined distance in the direction in which the inverted U-shaped cross sections are arranged in parallel. Here, the support base 60 is closed between the heat exchanger 66 and the heat exchanger 66 on the upper surface. Thereby, the air flow sent to the upper surface of the support 60 by the blower 62 passes through the heat exchanger 66 and is then discharged outside.

  In the heat exchange unit 64, each heat exchanger 66 is connected to the inflow pipe 42 and the outflow pipe 44. That is, the pipes arranged on the support base 60 are branch pipes in which the flow path connected to the inflow pipe 44 is branched into a plurality and connected to the plurality of heat exchangers 66. In addition, the pipe arranged on the support base 60 is a branch pipe that branches into a plurality of flow paths connected to the outflow pipe 46 and is connected to a plurality of heat exchangers 66. Thereby, the heat exchanger 66 is connected with the inflow pipe 42 and the outflow pipe 44, respectively, and the secondary coolant is circulated. The heat exchanger 66 performs heat exchange between the secondary coolant flowing in from the inflow pipe 42 and the air flow guided by the blower 62 and the guide pipes 54 and 55 to cool the secondary coolant. .

  As shown in FIGS. 4 and 5, the heat exchanger 66 includes a supply unit 70, a discharge unit 72, and a fin tube group 73. Here, the heat exchanger 66 has the same shape on both the surface extending in the horizontal direction (surface on the upper side in the vertical direction) and the surface extending in the vertical direction that form an inverted U-shape, and air flows. A plurality of fin tubes 74 are stacked in the direction. In addition, air flows in the vertical direction with respect to the surface (surface on the upper side in the vertical direction) extending in the horizontal direction of the heat exchanger 66, and air flows in the horizontal direction with respect to the surface extending in the vertical direction. The air flow may meander or flow at an angle.

  The supply unit 70 is connected to the inflow pipe 42 and is supplied with the secondary coolant flowing through the inflow pipe 42. The fin tube group 73 includes a plurality of fin tubes 74. The fin tube has one end connected to the supply unit 70 and the other end connected to the discharge unit 72. The fin tube 74 of the fin tube group 73 guides and discharges the secondary coolant supplied from the supply unit 70 to the discharge unit 72. The discharge part 72 is connected to the outflow pipe 44, and discharges the secondary coolant discharged from the fin tube group 73 to the outflow pipe 44.

  Here, the fin tube 74 which comprises the fin tube group 73 is a heat exchanger tube, and as shown in FIG.5 and FIG.6, with the flow pipe (tube) 80 and the fin part 82 connected to the flow pipe 80, it is. Composed. The distribution pipe 80 is a pipe line that distributes the secondary coolant. The fin portion 82 is a spiral plate-like member provided on the outer periphery of the flow pipe 80. The fin portion 82 is formed of a material having high heat conductivity (for example, a metal such as an aluminum alloy or copper) in the flow pipe 80 and the fin portion 82. In addition, the fin part 82 should just be a shape connected to the flow pipe 80, and a large surface area, and a shape is not specifically limited. For example, the fin portion 82 may have a configuration in which ring-shaped plate-like members are arranged at predetermined intervals in the extending direction of the pipe line of the flow pipe 80. In addition, the fin portion 82 may be provided with a plurality of plate-like members whose extending direction of the conduit of the circulation pipe 80 is the longitudinal direction at a predetermined interval around the extending direction of the circulation pipe 80.

  As shown in FIG. 6, in the fin tube 74 of the present embodiment, in the cross section, when the diameter of the flow pipe 80 is Db and the outer diameter of the fin portion 82 is Df, 2Db ≦ Df ≦ 4Db is preferable. By making the size of the fin portion 82 relative to the flow pipe 80 the above relationship, the secondary coolant flowing through the flow pipe 80 can be suitably cooled.

  As shown in FIGS. 4 and 6, the fin tube group 73 includes a plurality of fin tubes 74 stacked in the vertical direction. In the fin tube group 73, as shown in FIG. 6, a plurality of fin tubes 74 at each stage are arranged in the horizontal direction (direction orthogonal to the air flow). In addition, although the fin tube group 73 has shown only five steps in FIG. 4, and only four steps in FIG. 6, the number of steps is not specifically limited. For example, in the fin tube group 73, fin tubes 74 arranged in 792 rows (books) in the horizontal direction (width direction) may be arranged in four stages in the vertical direction. In this case, 3168 fin tube groups 73 can be arranged. The number of fin tubes 74 arranged as the fin tube group 73 in the horizontal direction and the number of steps in the vertical direction are not limited thereto. In the fin tube group 73 of this embodiment, the fin tubes 74 are arranged at the arrangement pitch S1 in the horizontal direction (width direction), and the fin tubes 74 are arranged at the arrangement pitch S2 in the vertical direction (air flow direction).

  In the heat exchanger 66, the air flow supplied from the blower 62 passes through the fin tube group 73. The heat exchanger 66 is subjected to heat exchange between the air flow and the secondary coolant passing through the fin tube group 73 by blowing the air flow discharged from the blower 62 to the fin tube group 73. The secondary coolant guided by the fin tube group 73 is cooled. Moreover, the heat exchanger 66 can increase the area where the fin tube 74 and the air flow are in contact with each other by providing the fin portion 82 on the fin tube 74, and can increase the heat transfer rate. The next coolant can be efficiently cooled.

  The nuclear facility 1 is provided with a cooling device 40 for cooling the secondary coolant in the air cooling system in the secondary cooling system 4, so that the secondary coolant can be used even when the water cooling mechanism for cooling the secondary coolant cannot be used. The primary cooling system 3 and the nuclear reactor 5 can be cooled.

  Further, since the cooling device 40 is configured such that the secondary coolant does not flow by closing the on-off valves 46 and 48, the secondary cooling is performed when the secondary cooling system 4 that rotates the turbine 22 is operating normally. Electricity can be generated by efficiently using the heat obtained by the material.

  In addition, the cooling device 40 has a surface that faces the blower 62 of the heat exchanger 66 of the air cooler 50 so as to protrude in a direction away from the blower 62 (vertically upward), whereby the blower of the heat exchanger 66. The area of the surface facing 62 can be increased. Thereby, the area | region which can arrange | position the fin tube 74 can be enlarged, suppressing the increase in resistance at the time of passing the heat exchanger 66. FIG. The cooling device 40 can suppress the increase in the fin tube arrangement density and the number of layers in the direction in which the air flow passes, so that the air flow suitably passes through the heat exchanger 66 without increasing the wind pressure output from the blower 62. Can be able to. Thereby, more fin tubes 74 can be disposed without changing the wind pressure of the air flow discharged by the blower 62, and the cooling capacity per installation area can be further increased.

  The cooling device 40 has a shape in which the surface of the heat exchanger 66 facing the blower 62 is convex in a direction away from the blower 62, so that the air flow discharged from the blower 62 is preferably spread over the entire area of the heat exchanger 66. Can be discharged.

  The cooling device 40 can arrange fin fins more efficiently by making the shape of the heat exchanger 66 into an inverted U shape, and can further increase the cooling capacity per installation area.

  The cooling device 40 closes the space between the heat exchanger 66 and the heat exchanger 66 on the upper surface of the support base 60, that is, the area where the heat exchanger 66 is not disposed, so that the air discharged from the blower 62 is more efficient. It can be supplied to the heat exchanger 66 well. Moreover, the heat exchanger 66 can supply the air discharged from the blower 62 to the heat exchanger 66 more efficiently by closing the surfaces at both ends in the extending direction. In addition, the heat exchanger 66 may arrange | position the fin tube group 73 also to the surface of the both ends of the extension direction. Further, the surface of the heat exchanger 66 that is in contact with the other heat exchanger 66 in the extending direction may not be blocked.

[Other embodiments]
FIG. 7 is a schematic configuration diagram schematically illustrating an air cooler of a cooling device according to another embodiment. FIG. 8 is a front view of the air cooler shown in FIG. FIG. 9 is a schematic configuration diagram schematically illustrating a rectifying plate of the air cooler. Hereinafter, another embodiment will be described with reference to FIGS. In addition, since the cooling device shown below is the same as the cooling device 40 of the said Example except the structure of an air cooler, only an air cooler is shown. The air cooler 50a shown in FIG.7 and FIG.8 has the support stand 60, the air blower 62, the heat exchange unit 64a, and the baffle plates 90 and 92. FIG. The support base 60 and the blower 62 have the same configuration as the air cooler 50.

  The heat exchange unit 64 a is disposed on the upper surface of the support base 60, that is, on the upper side in the vertical direction of the blower 62. The heat exchange unit 64a includes a plurality of heat exchangers 66a. As shown in FIG. 7, the heat exchange unit 64a of the present embodiment includes nine heat exchangers 66a. The heat exchanger 66a has a shape in which a surface facing the blower 62, that is, a surface facing downward in the vertical direction is convex upward in the vertical direction. The heat exchanger 66a has the same shape as that of the heat exchanger 66 in the shape of the surface orthogonal to the extending direction. The heat exchanger 66a has a shape in which surfaces extending in the vertical direction are connected to both ends of a surface extending in the horizontal direction, that is, a shape in which the cross section is an inverted U-shape. The heat exchanger 66 has a shape in which a portion that is an inverted U-shape extends in one direction.

  Further, in the heat exchange unit 64a, nine heat exchangers 66a are arranged in a direction in which inverted U-shaped sections are arranged in parallel, and are arranged so that inverted U-shaped sections are connected to each other. . That is, in the heat exchange unit 64a, nine heat exchangers 66a are arranged in a 3 × 3 matrix. In the heat exchanger unit 64a, the heat exchanger 66a and the heat exchanger 66a are arranged at a predetermined distance in the direction in which the inverted U-shaped cross sections are arranged in parallel. In the heat exchanger unit 64a, the heat exchanger 66a and the heat exchanger 66a are arranged at positions spaced apart from each other even in the direction in which the inverted U-shaped cross sections are connected. That is, the heat exchanger 66a is disposed at a predetermined interval from the other heat exchanger 66a. The support base 60 is closed between the heat exchanger 66a on the upper surface and the heat exchanger 66a. As a result, the air flow sent to the upper surface of the support base 60 by the blower 62 passes through the heat exchanger 66a and is then discharged outside.

  The rectifying plates 90 and 92 are disposed between the blower 62 and the heat exchanger 66. The rectifying plates 90 and 92 are members that change the flow of the air flow discharged from the blower 62. The rectifying plate 90 is in contact with the surface extending in the horizontal direction among the surfaces facing the blower 62 of the heat exchanger 66. The two rectifying plates 92 are in contact with the surfaces extending in the vertical direction among the surfaces facing the blower 62 of the heat exchanger 66.

  The rectifying plate 90 is a plate-like member having openings arranged at predetermined intervals. The air exhausted from the blower 62 passes through the rectifying plate 90 and is then exhausted to a region where the fin tube group on the surface extending in the horizontal direction of the heat exchanger 66a is disposed.

  The rectifying plate 92 is a plate-like member in which openings 94 are arranged at a predetermined interval as shown in FIG. In the rectifying plate 92, the diameter of the opening 94 near the blower 62 is small, and the diameter of the opening 94 increases as the distance from the blower 62 increases. The air discharged from the blower 62 passes through the rectifying plate 92 and is then discharged into the region where the fin tube group on the surface extending in the vertical direction of the heat exchanger 66a is disposed.

  Although the air cooler 50a is discharged from the blower 62, the air flow passes through the opening 94 disposed in the rectifying plates 90 and 92 and is discharged to the region where the fin tube group is disposed. The averaged air can be supplied to each part inside the exchanger 66a. Thereby, the efficiency of heat exchange of the heat exchanger 66a can be further improved. In addition, by changing the diameter of the opening 94 according to the position with respect to the blower 62 as in the rectifying plate 92, specifically, the area where air is easily supplied from the blower 62 has a small opening, and the air is blown from the blower 62. By increasing the opening of the region that is difficult to be supplied, the amount of air supplied to each part of the heat exchanger 66a can be made constant, and the secondary coolant can be cooled more uniformly.

  FIG. 10 is a schematic configuration diagram schematically illustrating an air cooler of a cooling device according to another embodiment. FIG. 11 is a front view of the air cooler shown in FIG. FIG. 12 is a schematic configuration diagram schematically showing a current plate of the air cooler. The air cooler 100 shown in FIGS. 10 and 11 has the same configuration as the air cooler 50 except that the shape of the heat exchanger 104 and the blower 108 are installed. The air cooler 100 includes a base, a blower 62, a heat exchange unit, a rectifying plate 106, and a blower 108. Further, the heat exchange unit has a plurality of heat exchangers 104.

  The heat exchanger 104 has a shape in which the surface facing the blower 62 is formed by removing the bottom of the triangle that is convex upward in the vertical direction. Thus, the upper surface of the support base is in the shape of an isosceles triangle on the bottom surface. Further, the heat exchanger 104 has a shape in which a shape obtained by removing a base of a triangle protruding upward in the vertical direction in one direction is extended.

  The rectifying plate 106 is disposed between the blower 62 and the heat exchanger 104. The rectifying plate 106 is a plate-like member that changes the flow of the air flow discharged from the blower 62. As shown in FIG. 12, the rectifying plate 106 is a circular plate-like member that blocks a part including the center directly above the blower 62. In addition, the dotted line 120 has shown the outer edge of the area | region through which the propeller of the air blower 60 passes at the time of rotation. The rectifying plate 106 is arranged in a region smaller than the dotted line 120, that is, smaller than the outer edge of the region through which the propeller passes. The rectifying plate 106 disperses the air flow discharged toward the position directly above the blower 62 out of the air flow discharged from the blower 62 to the outside of the air flow directly above the blower 62. The dispersed air flow flows in each direction and reaches the heat exchanger 104.

  The blower 108 is disposed above the heat exchanger 104 in the vertical direction. Here, the blower 108 of the present embodiment is disposed at a position sandwiched between the two heat exchangers 104. The blower 108 forms an air flow that discharges the air on the lower side in the vertical direction to the upper side in the vertical direction. That is, the blower 108 discharges the air that has passed through the heat exchanger 104 to a position further away from the heat exchanger 104. Therefore, it can be said that the blower 108 is an air suction device that sucks the air that has passed through the heat exchanger 104. The air cooler 100 is configured as described above.

  In the air cooler 100, the heat exchanger 104 is shaped by removing the bottom of the triangle that protrudes upward in the vertical direction, so that the number of fin tubes per installation area is smaller than that of the inverted U-shape. The number of hit fin tubes can be increased to a certain degree. As a result, the cooling capacity can be improved to a certain extent.

  The air cooler 100 can disperse the air flow by blocking a part of the air flow discharged from the blower 62 by the rectifying plate 106 directly above the blower 62, and each part inside the heat exchanger 104. Can be supplied with averaged air. Thereby, the efficiency of heat exchange of the heat exchanger 104 can be further improved. The shape of the rectifying plate 106 is not limited to the above shape.

  The air cooler 100 is provided with a blower 108 on the upper side in the vertical direction of the heat exchanger 104, and by sucking the air that has passed through the heat exchanger 104, it is possible to suppress the occurrence of heat retention. In 104, heat exchange can be performed more suitably. Further, the air cooler 100 can suck a part of the air passing through the heat exchanger 104 by sucking the air that has passed through the heat exchanger 104 by the blower 108, and passes through the heat exchanger 104. Air can be facilitated through the heat exchanger 104. Thereby, more air can be made to pass the heat exchanger 104, and heat exchange can be performed more suitably.

  FIG. 13 is a schematic configuration diagram schematically illustrating an air cooler of a cooling device according to another embodiment. The air cooler 100 a includes two blowers 108 arranged on the upper side in the vertical direction of the heat exchanger 104. The air cooler 100a can more reliably prevent heat from staying on the upper side in the vertical direction of the heat exchanger 104 by providing two fans 108, and the air passing through the heat exchanger 104 can exchange heat. The device 104 can be made easier to pass. In addition, the number of heat exchangers arranged on the upper side in the vertical direction of the heat exchanger 104 is not particularly limited.

  The nuclear power facility 1 uses a control device 41 to open / close a valve when an abnormality occurs in the water-cooled heat exchanger (the condenser 23 and the cooling pipe 27) or when an abnormality occurs in the steam pipe 21, the water supply pipe 26, or the like. By opening 46 and 48 and starting circulation of the secondary coolant by the pump 49 and operating the air cooler 50, the secondary coolant can be cooled when an abnormality occurs.

  In the above embodiment, the inflow pipe 42 and the outflow pipe 44 of the cooling device 40 are connected to the steam generator 7, but the present invention is not limited to this. The cooling device 40 may connect the inflow pipe 42 and the outflow pipe 44 to the water supply pipe 26. That is, the secondary cooling system 4 may connect the water-cooled heat exchanger (the condenser 23 and the cooling pipe 27) and the air-cooled cooling device 40 in series. Moreover, the secondary cooling system 4 may arrange | position the cooling device 40 instead of a water-cooled heat exchanger (the condenser 23 and the cooling pipe 27). In this case, the nuclear facility 1 always operates the cooling device 40 as a mechanism for cooling the secondary coolant.

DESCRIPTION OF SYMBOLS 1 Nuclear power facility 3 Primary cooling system 4 Secondary cooling system 5 Reactor 7 Steam generator 8 Pressurizer 15 Fuel assembly 16 Control rod 17 Control rod drive device 22 Turbine 25 Generator 40 Cooling device (cooling device for emergency)
42 Inflow pipe 44 Outflow pipe 46, 48 On-off valve 49 Pump 50 Air cooler 60 Support base 62 Blower 64 Heat exchange unit 66 Heat exchanger 70 Supply part 72 Discharge part 73 Fin tube group 74 Fin tube (heat transfer pipe)
80 Distribution pipe (tube)
82 Fin 90, 92 Current plate 94 Opening

Claims (9)

An inflow pipe for guiding the medium flowing through the secondary cooling system of the nuclear facility;
An air cooler that includes a heat exchanger that has a plurality of fin tubes that circulate the medium therein and a blower that is disposed vertically below the heat exchanger, and that cools the medium supplied from the inflow pipe;
An outflow pipe for guiding the medium cooled by the air cooler to the secondary cooling system,
The cooling device according to claim 1, wherein a surface of the heat exchanger that faces the blower is convex upward in the vertical direction.   2. The heat exchanger according to claim 1, wherein a surface facing the blower has an inverted U-order shape in which two surfaces parallel to the vertical direction and a surface parallel to the horizontal direction are combined. The cooling device as described.   The said air cooler further has a baffle plate arrange | positioned between the said heat exchanger and the said air blower, The cooling device of Claim 1 or 2 characterized by the above-mentioned.   The cooling device according to claim 3, wherein the rectifying plate is disposed along a surface of the heat exchanger that faces the blower.   The cooling device according to claim 4, wherein the rectifying plate is a plate-like member in which a plurality of openings are formed, and the diameters of the plurality of openings increase toward the upper side in the vertical direction. The air cooler further includes a current plate arranged between the heat exchanger and the blower,
2. The cooling device according to claim 1, wherein the heat exchanger has a shape of a cross section of a surface facing the blower in which a base of a triangular triangle protruding upward in the vertical direction is removed.   The cooling device according to claim 6, wherein the rectifying plate is provided with a shielding portion that shields air at least at a part directly above the blower.   The said air cooler is further arrange | positioned in the perpendicular direction upper side of the said heat exchanger, It has further the air blower which sucks in and discharges the air which passed the said heat exchanger, The any one of Claim 1 to 7 characterized by the above-mentioned. The cooling device according to 1.   The cooling device according to any one of claims 1 to 8, wherein the blower is a propeller fan.

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