JPS6027878B2 - High temperature insulation piping using honeycomb plates - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a nuclear power plant using a high-temperature gas reactor using helium gas as a heat medium and an experimental plant for the same.
This relates to high-temperature insulation piping for transporting high-pressure gas of K9/C type.

Due to the high temperature and high pressure of this type of piping, it is difficult to use normal single-walled piping, so high-temperature insulation is used to maintain pressure by lowering the temperature of the outer pipe by applying insulation inside. It is necessary to install piping.

The thermal insulation performance of this insulated pipe is close to the thermal conductivity of the gas itself in the absence of convection or radiation, since the insulation material applied inside is in the atmosphere of the helium gas being transported. . In conventional high-temperature insulation piping, as shown in FIG.

However, in the above conventional method, there is a problem that impurities in the insulation material c get mixed into the fluid, and the insulation effect of the insulation material c decreases significantly when it gets wet. It cannot be inspected by a pressure test using , so it must be inspected using nitrogen gas, etc.
There are problems such as the work is troublesome and the inspection cost is high.

The high-temperature insulated piping of the present invention prevents the above-mentioned convection and radiation by combining a honeycomb plate and a cover plate, and has an insulating effect, prevents the mixing of impurities into the fluid, controls the appropriate temperature of the outer pipe, and performs water pressure tests. This nuclear power plant has a fluid flow path constructed by arranging fluid liners in series at the required intervals inside the outer tube and having a nozzle-shaped downstream side. In high-temperature insulated piping in plants, etc., honeycomb plates and cover plates are arranged alternately between the fluid flow path of the above structure and the outer pipe on the outside thereof, and a heat insulation layer composed of the honeycomb plates and the cover plate is provided. It is characterized by a multi-layered structure that provides the minimum necessary air permeability.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 2 and 3, fluid liners 1 for forming high-temperature fluid flow paths are arranged in series with a required gap, rather than as one continuous pipe, and each The downstream side of the liner 1 is formed into a nozzle shape as shown in FIG. 2, and a plurality of heat insulating layers 5 each consisting of a honeycomb plate 3 and a cover plate 4 are provided between the fluid liner 1 and the outer tube 2 on the outside thereof. In other words, a plurality of honeycomb plates 3 and cover plates 4 are arranged alternately such that a cover plate 4 is arranged on the outside of the honeycomb plate 3, and a honeycomb plate 3 is further arranged on the outside of the cover plate 4. A heat insulating layer 5 is formed.

Further, the cover plate 4 is not an airtight cylinder, but is, for example, a flat plate of unit length simply formed into a cylinder shape. Therefore, there is a narrow but minimum necessary gap between the honeycomb plate 3 and the cover plate 4, and each heat insulating layer 5
Breathability is ensured between them. The honeycomb plate 3 has, for example, a hexagonal honeycomb shape, as shown in FIG. It has become. According to the above configuration, the honeycomb plate 3 and the cover plate 4 subdivide the gas atmosphere layer to prevent the transfer of thermal energy due to convection and Korean radiation, and furthermore, the heat insulating layer is formed by the combination of the honeycomb plate 3 and the cover plate 4. By providing an appropriate number of tubes 5, the outer tube 2 can be insulated to an appropriate temperature.

In addition, each of the above-mentioned heat-insulating spaces 6 is larger and more regularly arranged than the space formed by the fiber-based heat-insulating material, and since the honeycomb plate 3 and the cover plate 4 are made of metal, they do not contain water and the surface However, its water retention capacity is significantly lower than that of fiber-based insulation materials. Therefore, it is easy to drain water after filling the heat insulating layer with water, and the welded portion 2' of the outer tube 2 can be easily inspected using a hydraulic test method. It should be noted that the present invention is not limited to the above-mentioned embodiments, and that the number of heat insulating layers can be changed as appropriate, the shape of the honeycomb plate can be changed in various ways, it can be applied to various high-temperature insulated piping, and other features can be realized. Of course, various changes may be made without departing from the gist of the invention.

According to the above-mentioned insulated piping using the honeycomb plate of the present invention, (i) it is possible to completely eliminate impurities from the fiber-based insulation material and the dense insulation material from being mixed into the fluid as in the conventional method; I can do it.

(ii) By forming several layers of heat insulating material composed of a combination of honeycomb plates and cover plates, the outer tube can be insulated to an appropriate temperature.

(iii) It becomes possible to perform a water pressure test on the welded portion of the outer tube, and the inspection can be performed easily and inexpensively.

OW Since the minimum required air permeability is provided between each insulation layer, there is no significant pressure difference between each insulation layer or between the insulation layer and the fluid flow path, which prevents damage to the honeycomb plate and cover plate. There is no.

etc., exhibits various excellent effects.

[Brief explanation of the drawing]

FIG. 1A is a cutaway side view of the conventional method, the opening in FIG. 1 is a view taken along the line A-A in FIG. The BB arrow view in FIG. 2 and FIG. 4 are perspective views for clearly showing the honeycomb plate of the present invention. 1 is a fluid liner, 2 is an outer tube, 3 is a honeycomb plate, 4 is a cover plate, 5 is a heat insulating layer, and 6 is a heat insulating space. Figure 7 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. In high-temperature insulated piping for nuclear power plants, etc., which has a fluid flow path configured by arranging fluid liners in series at required intervals inside an outer pipe and having a nozzle-shaped downstream side, the fluid of the above configuration is used. Honeycomb plates and cover plates are arranged alternately between the flow path and the outer tube outside the flow path, and a plurality of heat insulating layers composed of the honeycomb plates and cover plates are formed with the minimum necessary air permeability. High-temperature insulation piping using honeycomb plates.