JPS6383484A - Cooling structure of concrete-wall penetrating section of high-temperature piping heat-insulating cylinder - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling structure for a concrete wall penetrating portion of a high temperature piping insulation cylinder in an atomic couplant. □１
[Prior art and its problems] In both the primary cooling system and the secondary cooling system of an atomic couplant, high-temperature piping through which liquid sodium, which is a coolant, flows is surrounded by a heat insulating cylinder. Since this high-temperature piping heat-insulating cylinder is piped through a concrete wall that is a partition wall between cells, the through-hole portion of the concrete wall is heated by the heat radiated from the high-temperature pipe heat-insulating cylinder. For this reason, conventionally, as shown in Fig. 3,
A through hole 4 in a concrete wall 3 through which a heat insulating cylinder 2 having a heat insulating material such as Rockfine encasing a high-temperature pipe 1 through which liquid sodium flows is blown by a blower 5 or cooled by cooling the inner peripheral surface of the through hole 4. A water cooling pipe 6 is buried nearby, and cooling water is circulated to cool the area around the through hole 4. In addition, 7 in the figure is a bellows that seals the space between the heat insulating tube 2 and the through hole 4.

By the way, the above-mentioned cooling method applies excessive temperature 5 in the length direction of the high-temperature piping, and especially in the high-temperature piping 1 which has an electric heater for preheating to prevent solidification of the internal fluid, The excessive temperature distribution in the horizontal direction makes it difficult to set the capacity and weight of the heater, making it difficult to preheat in a balanced manner.

For this reason, there are some parts where the temperature of the gas in the gap with the through hole 4 rises abnormally due to the heat dissipated from the surface of the heat insulating tube 2, and the temperature near the inner circumference of the through hole 4 (inner 1) increases. There were parts where the concrete lost its integrity when the temperature exceeded 100°C.

[Object of the Invention] The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a cooling structure that can maintain the integrity of the concrete in the concrete wall penetration part of the high-temperature piping insulation cylinder. This is the purpose.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the cooling structure of the concrete wall penetrating portion of the high temperature piping insulation cylinder according to the present invention is such that the cooling structure for the concrete wall penetrating part of the high temperature piping insulation cylinder is configured to cool the concrete wall penetrating part of the high temperature piping insulation cylinder. , an exterior plate is provided horizontally on the outer surface of the heat-insulating tube to divide the gap between the heat-insulating tube and the through-hole vertically, and the space between the heat-insulating tube and the periphery of the through-hole is sealed off on the bell side. They communicate with each other to form a U-turn passage, and a stack is provided on the entrance/exit side of the U-turn passage.

[Function] The cooling structure of the concrete wall penetration part of the high-temperature piping heat insulation tube with the above configuration is such that the heat dissipated from the surface of the heat insulation tube increases the temperature of the waste in the gap between the concrete wall and the through hole. As a result of gas flow occurring in the turn passage due to natural convection, heated gas exits the U-turn passage and is discharged from the stack, and room temperature gas continuously flows into the U-turn passage. The temperature of the concrete near the inner circumferential surface of the hole does not exceed 100° C., thus maintaining the integrity of the concrete.

[Example] An example of a cooling structure for a concrete wall penetrating portion of a high-temperature piping insulation cylinder according to the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, the same reference numerals as those in FIG. 3 indicate the same parts, so the explanation thereof will be omitted. In the through hole 4 of the concrete wall 3, exterior plates 8 are horizontally fixed on the outer surface of the heat insulating cylinder 2 on the left and right to divide the gap between the heat insulating cylinder 2 and the through hole 4 vertically, and to divide the gap between the heat insulating cylinder 2 and the through hole 4 into upper and lower sides. It communicates with the outside of the through hole 4 to form a U-turn passage 9. Then, on the entrance/exit side of the U-turn passageway 9, that is, on the opposite side from the bellows 7, a shielding plate 10 with a cross-sectional shape is provided perpendicularly at an appropriate distance from the concrete wall 3, and one end of the exterior plate 8 is connected to the inner surface of the shielding plate 10. , forming a stack 11. The height of this stack 11 is set to an appropriate height in order to optimize the amount of gas flowing into the U-turn passage 9.

According to the concrete wall penetration cooling structure of the embodiment configured as described above, gas in the gap between the concrete wall 3 and the penetration hole 4 rises due to the heat radiated from the surface of the heat insulation cylinder 2 enclosing the high temperature pipe 1. However, due to the temperature rise of the gas, a gas flow is generated in the U-turn passage 9 by natural convection. As a result, the heated gas exits the U-turn passage 9 and is discharged from the upper end of the stack, and the room temperature gas continuously flows into the U-turn passage 9 from the lower end of the stack 11. In particular, since the stack 11 is formed on the entrance/exit side of the U-turn passage 9, the force of the gas driver 71 is strong, and therefore the U-turn
Since the flow rate of the gas flowing through the turn passage 9 is high, the temperature of the concrete near the inner peripheral surface of the through hole 4 is about 70°C, and the temperature of the gas discharged from the upper end of the stack 11 is about 60°C.
Since the temperature will be around 5℃, the integrity of the concrete will be ensured.

[Effects of the Invention] As can be seen from the above explanation, according to the cooling structure of the concrete wall penetrating portion of the high-temperature piping insulation tube according to the present invention, the temperature of the gas in the through hole of the concrete wall rises due to the heat radiated from the insulation tube. As a result, a gas flow occurs due to natural convection in the U-turn passage formed in the through-hole, and gas at room temperature continuously flows into and passes through the U-turn passage, so that the concrete near the inner peripheral surface of the through-hole The temperature of the concrete is suppressed to 100° C. or less, and the integrity of the concrete is maintained, and there is no need to cool the concrete by blowing air or burying a water cooling pipe near the inner peripheral surface of the through hole as in the past.

In addition, by adjusting the height of the stack on the entrance and exit side of the U-turn passage, the amount of gas flowing into the U-turn passage can be changed, so the temperature of the concrete near the inner peripheral surface of the through-hole can be suppressed to a desired temperature. is possible.

Furthermore, in a high-temperature color scheme with an electric heater for preheating, it is possible to harmonize the temperature distribution in the vertical direction with the high-temperature piping other than the wall penetration part, and it is easy to set the capacity of the electric heater.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an embodiment of the cooling structure for the concrete wall penetrating portion of a high-temperature piping insulation cylinder according to the present invention, Fig. 2 is a sectional view taken along line AA in Fig. 1, and Fig. 3 is 1...・High temperature piping
2...Heat insulation tube 3...Concrete 1~Wall 4
... Through hole 7 ... Bellows 8 ... Exterior plate 9 ... U-turn passage 11 ... Stack patent applicant Kawasaki Heavy Industries Co., Ltd.... Agent Patent attorney Yujibe Ko 5 ．．゛go,,9
ζ width・′・−′ Figure 1? Figure 2

Claims (1)

[Claims] Inside the through-hole in the concrete wall through which the high-temperature piping insulation tube penetrates, an exterior plate is installed horizontally on the outer surface of the insulation tube to divide the gap between the insulation tube and the through-hole into upper and lower sections, and to separate the insulation tube and the through-hole. A cooling structure for a concrete wall penetrating part of a high-temperature piping insulation cylinder, which communicates with the peripheral edge at a closed bellows side to form a U-turn passage, and a stack is provided on the entrance and exit side of the U-turn passage.