JP3843471B2 - Air-cooled heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air-cooled heat exchange device used in nuclear facilities and the like, and more particularly to an air-cooled heat exchange device installed outdoors.
[0002]
[Prior art]
FIG. 5 shows an air-cooled heat exchange apparatus that is being considered for application to nuclear facilities. As shown in the figure, this air-cooled heat exchange device includes a panel-shaped tube bundle portion b composed of a plurality of heat transfer tubes on the upper portion of a frame structure a composed of a plurality of steel frames, and a cylindrical shape below the tube bundle portion b. The fan ring c and the fan drive unit e including the electric fan d are provided in plural. Then, high-temperature cooling water generated from the nuclear facility, for example, cooling water of the auxiliary equipment cooling water system of the spent fuel storage facility, is allowed to flow to the tube bundle part b side, and at the same time, the outside air is forcibly discharged from the electric fan d below. The high-temperature fluid that flows through the tube bundle portion b is cooled and then returned to the auxiliary coolant system again.
[0003]
[Problems to be solved by the invention]
By the way, the heat exchanging device having such a structure sucks outside air from the lower side of the fan ring c and sends it to the tube bundle part b side above the fan ring c. In order to secure the air suction area, it is necessary to install the fan drive unit e at a certain height from the ground as shown in the figure. However, if the installation height of the fan drive unit e or the tube bundle unit b is increased, the center of gravity of the entire device increases, and the seismic resistance and rigidity are insufficient. Therefore, there is a problem that many steel frames must be used. is there. Also, if there is snow during or after operation, the snow melting water generates a large ice column especially at the lower part of the tube bundle part b. Therefore, the troublesome work of having to remove this ice column every time of operation is strong. May be. Furthermore, since it is necessary to open the periphery of the frame structure 1 as large as possible in order to improve the intake of air, the steel frame portion of the frame structure 1 is exposed to the outside as it is, so that the aesthetic appearance of the entire apparatus is achieved. There was also the fault that it was damaged.
[0004]
Therefore, the present invention has been devised to solve the above-mentioned problems, and its main purpose is to lower the center of gravity of the entire device to improve the earthquake resistance and rigidity, and without damaging the aesthetic appearance. The object is to provide a novel air-cooled heat exchange device.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a panel-shaped tube bundle portion composed of a plurality of heat transfer tubes for flowing a high-temperature fluid generated in a nuclear facility, etc., and a fan driving portion for flowing air through the tube bundle portion to perform air cooling, In an air-cooled heat exchange apparatus installed outdoors that includes a frame structure that supports these, a rectangular frame structure is erected on the ground, and the tube bundle portion and the fan drive are mounted on the upper surface of the frame structure. part placed on the same plane, and a partition plate provided on a side surface of the frame structure, the frame structure are those obtained by defining a flow path for air connecting the tube bundle unit and the fan drive, also The tube bundle portion and the fan drive portion are alternately provided along the length direction of the frame structure, and the flow path is divided for each of the pair of tube bundle portions and the fan drive portion.
[0006]
Since the present invention is configured as described above, when the fan driving unit is driven and the air in the flow path of the frame structure is exhausted from the opening of the frame structure and the flow path has a negative pressure, the surrounding air is After passing through the tube bundle portion and flowing into the flow path of the frame structure, the high-temperature fluid flowing through the tube bundle portion is cooled and then exhausted from the opening of the frame structure again by the fan drive portion. Alternatively, the air taken in by the fan drive unit is taken from the opening formed in the upper surface of the frame structure to the flow path side in the frame structure, passes through, then flows to the tube bundle side, and further passes through here. In addition, after the high-temperature fluid flowing through the tube bundle portion is cooled, it is exhausted above the frame structure. That is, unlike the conventional case, both the intake and exhaust of air are performed through the opening formed in the upper surface of the frame structure, and thus the height of the entire frame structure can be reduced.
[0007]
Therefore, the center of gravity of the entire apparatus can be lowered, and the rigidity of the entire apparatus can be improved. In addition, since the tube bundle portion and the fan drive portion are separated, even if an ice column is generated in the tube bundle portion, the drive of the fan drive portion is not affected, and the operation can be started immediately.
[0008]
Moreover, since the side surface of the frame structure is partitioned by the partition plate, the steel frame structure is not directly exposed to the outside, and an improvement in aesthetics can be achieved at the same time.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
[0010]
1 and 2 show an embodiment of an air-cooled heat exchange apparatus according to the present invention. As shown in the figure, this air-cooled heat exchange device is a panel-like structure composed of a plurality of finned tube heat transfer tubes so as to cover an opening 1a on the upper surface of a rectangular steel frame structure 1. The tube bundle portion 2 and the fan driving portion 3 are alternately provided along the length direction thereof. In addition, an inlet header 4a and an outlet header 4b are provided at the ends of these tube bundle portions 2, and a high-temperature fluid flowing from a reactor facility (not shown) is allowed to pass through the tube bundle portion 2 and be atomized again. Return to the furnace equipment side.
[0011]
Further, partition plates 8 are provided on the four side surfaces of the rectangular frame structure 1 so that the tops of the tube bundle portion 2 and the fan drive portion 3 are hidden. An air flow path 9 is defined in the body 1. The fan drive unit 3 is provided with a blowing means 7 having a fan ring 6 around the electric fan 5 in parallel. The air in the air flow path 9 is sent to the outside, or the outside air is sent to the air flow path. 9 is forcibly sent. The height of the frame structure 1 is set such that the cross-sectional area of the flow path 9 is larger than the suction area of the tube bundle portion 2. Further, a net (not shown) is stretched on the suction port side of the fan ring 6 so that large garbage such as tree branches and small animals such as birds are not sucked into the fan ring 6.
[0012]
Further, as shown in FIG. 1, a plurality of intermediate partition plates 10 are provided at predetermined intervals along the length direction in the air flow path 9, and the length of the frame structure 1. Along the direction, the air flow path 9 is divided into a plurality of sections so that the tube bundle portion 2 and the fan drive portion 3 are paired.
[0013]
In the above, first, a high-temperature fluid flowing from an unillustrated nuclear facility is branched from the inlet header 4a and supplied to each tube bundle portion 2, and at the same time, the electric fan 5 of the blowing means 7 constituting the fan drive portion 3 is driven. Then, the air in the flow path 9 of the frame structure 1 is forcibly exhausted from the fan ring 6 provided in the opening 1a, and the pressure in the flow path 9 becomes negative. Then, since the side surface of the frame structure 1 is partitioned by the partition plate 8, the air around the apparatus passes from the tube bundle portion 2 side and flows into the flow path 9. At that time, the tube bundle portion 2 After taking the heat of the high-temperature fluid flowing through and cooling it, the fan drive unit 3 again exhausts the air upward from the opening 1a of the frame structure. At this time, since the inside of the air flow path 9 is partitioned into a pair of tube bundle portions 2 and a fan drive portion 3 by the intermediate partition plate 10, the outside air has a U-turn shape for each block as shown in FIG. Will flow into. Thereafter, as shown in FIG. 1, one cooled fluid joins at the other header 4b, and is then returned to the nuclear facility (not shown) again.
[0014]
Thus, in the present invention, the opening is formed on the upper surface of the frame structure, and the tube bundle portion and the fan drive unit are provided on the same plane in the opening. This is performed at the opening formed on the upper surface, which makes it possible to reduce the height of the entire frame structure. Accordingly, a low center of gravity of the entire apparatus is achieved, and the rigidity of the entire apparatus against an earthquake or the like is greatly improved. Further, even if an icicle is generated in the lower part of the tube bundle portion 2 when the fan drive unit 3 is driven, the icicle generated here has almost no effect on the operation of the fan drive unit 3, so the icicle is removed. The operation can be started as it is. This ice column is naturally removed by the heat of the tube bundle portion 2. Moreover, since the side surface of the frame structure is partitioned by the partition plate, the steel frame structure is not directly exposed to the outside, and an improvement in aesthetics can be achieved at the same time. Furthermore, if this frame structure 1 is divided into a plurality of parts and a fan drive unit or a tube bundle unit is modularized for each unit, it is produced in advance in a factory or the like, and if this is assembled on site, Shortening and maintenance cost reduction can be achieved at the same time.
[0015]
In this embodiment, since the cross-sectional area of the flow path 9 is set larger than the suction area of the tube bundle portion 2, there is almost no resistance to air flow in the flow path 9, and the load of the fan drive section 3 Since this depends on the suction area of the tube bundle portion 2, the load on the fan drive portion 3 is not particularly increased by such a configuration. As for the air flow direction, contrary to the present embodiment, the same effect can be obtained even if it flows from the fan drive section to the tube bundle section side, but then, it becomes easier for small animals to enter the fan drive section. In addition, it is considered that the dust collected on the net will not be removed even if the operation is stopped. Therefore, as shown in the figure, it is preferable to flow from the tube bundle portion side to the fan drive portion side. .
[0016]
In addition, the present invention is not limited to the above-described embodiment as long as the fan driving unit 3 and the tube bundle unit 2 are provided on the same plane in the upper opening 1a of the frame structure 1, for example, as shown in FIG. As shown in FIG. 4, the tube bundle portion 2 may be provided around both sides of the fan drive unit 3, and the number and size of the air blowing means 7 constituting the fan drive unit 3, Of course, the output and the like may be changed as necessary. Further, the intermediate partition plate 10 used in the description of the present embodiment is not necessarily required for configuring the present invention, and even if the configuration is omitted in some cases, it is considered that the effect is not greatly affected.
[0017]
【The invention's effect】
In short, according to the present invention, since the center of gravity of the entire apparatus is lowered, the earthquake resistance and rigidity are improved, and even if an ice column is generated in the tube bundle portion, it is not necessary to remove it. Moreover, since the steel frame part which comprises a frame structure is no longer exposed outside, the outstanding effect that the improvement of the aesthetics of the whole apparatus is achieved is exhibited.
[Brief description of the drawings]
FIG. 1 is a plan view illustrating one embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is a plan view showing another embodiment of the present invention.
FIG. 4 is a plan view showing another embodiment of the present invention.
FIG. 5 is a perspective view showing a conventional air-cooled heat exchange device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Frame structure 1a Opening part 2 Tube bundle part 3 Fan drive part 7 Blowing means 8 Partition plate 9 Air flow path

Claims (2)

A panel-shaped tube bundle part composed of a plurality of heat transfer tubes for flowing a high-temperature fluid generated in a nuclear facility, etc., a fan drive unit that air-cools the tube bundle part by flowing air, and a frame structure that supports them. In the air-cooled heat exchanger installed outdoors,
A rectangular frame structure is erected on the ground, and the tube bundle portion and the fan drive unit are placed on the same plane on the upper surface of the frame structure , and a partition plate is provided on a side surface of the frame structure. , the frame structure, air-cooled heat exchanger, characterized in that the flow path of air to compartment formed connecting the tube bundle unit and the fan drive. The tube bundle portion and the fan driving portion are alternately provided along the length direction of the frame structure, and the flow path is divided into a pair of the tube bundle portion and the fan driving portion. The air-cooled heat exchange device according to 1.

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