JPS599799B2 - Insulation device for high temperature fluid components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides high temperature fluids such as 40Ky/crA, 45
The present invention relates to a method for constructing a heat insulating layer on a conduit for transporting superheated steam at 0°C, a container for storing the high-temperature fluid, and equipment components attached to these conduits and containers.

If the gap between a conduit and its outer pipe or container, or equipment and its cover is filled with high temperature resistant insulation material at an even density, no gaps will be created in the insulation layer and heat will dissipate from the gaps. Although it is clear that this can be prevented, simply packing the insulation material from one end of the gap does not result in a heat insulation layer with uniform density due to frictional resistance between the insulation materials or between the insulation material and the peripheral wall.

In the present invention, a fixed amount of a mixture obtained by adding approximately the same amount of calcined gypsum and a small amount of water to granular or powdered pearlite is applied to the outer wall of a fluid conduit, container, or equipment at a temperature of 200°C or higher. It is press-fitted from one end into the gap between the cover and the cover, which is spaced apart from the cover, and is pressurized and solidified to a certain thickness, that is, a certain density, and this process is repeated to form a homogeneous and integral body throughout the gap. This is a construction method that fills the area with a high-temperature-resistant insulation layer.

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

Example 1 (See Figures 1 and 6) Granular or powdered pearlite obtained by firing pearlite and calcined gypsum were mixed in a weight ratio of 50:50, and 20 grams of water was added and mixed. A fixed amount of the mixed material 1 is filled into an annular gap 4 between a high-temperature fluid conduit 2 of 200° C. or higher and a synthetic resin pipe 3 concentric therewith, and pressurized to a fixed thickness.

When pressurizing, a ring-shaped spacer 5 made of a heat-resistant material, such as calcium silicate, is fitted and fixed on the end of the synthetic resin pipe 3, and a push rod a is inserted from the other end of the double pipe 2I3 as shown in FIG. Slide and apply pressure.

The appropriate limit for pressurization is an apparent specific gravity of 0.2 to 0.3.

When the pressurization is finished at one end, the push rod a is pulled out, and the next fixed amount is filled and pressurized in the same way.

By sequentially filling a given amount of the mixed material 1 and applying pressure over a given stroke, the annular gap 4 between the double pipes 2 and 3 is filled with a uniform and seamless integral material.

The calcined gypsum in the admixture 1 reacts with water and becomes a binder.
Pearlite particles are loosely bonded to each other and approximately 0.04 Kc
A heat insulating layer having a thermal conductivity of al/mh'C is formed.

In conventional construction methods, it is customary to provide a heat insulating layer around the fluid conduit and apply waterproofing to the outer circumferential surface of the fluid conduit, but for conduits buried underground, these conventional waterproof layers are used to protect against groundwater, etc. It has been proven that erosion causes it to leak out and lose its functionality.

In this method, a synthetic resin pipe that does not corrode is used as the outer pipe instead of the conventional waterproof layer.

The synthetic resin pipe 3 made of polyethylene has particularly excellent properties such as toughness, water resistance, and chemical resistance, so it is suitable for being used as an exterior pipe for high-temperature fluid conduits to be buried underground. It is.

Embodiment 2 (See FIGS. 2 and 7) A thin iron plate is curved into an annular shape for a high-temperature fluid conduit 2 of 200° C. or higher similar to the conduit 2 described in Example 1, and both edges 6, 6 are formed.
Hold the frame tube 7a to which the tube 7a is fixed concentrically with the pipe 2,
An annular spacer 5 similar to that in Example 1 is fixed to the end of the frame 1a, an appropriate homper 6 is temporarily secured adjacent to the frame cylinder 1a, and an admixture 1 similar to that in Example 1 is placed inside the homper 6. , the admixture 1 in the pumper 6 is pushed into the annular gap 8 between the conduit 2 and the frame tube 7a using a similar push rod a, and the pressure limit is the same as in the first embodiment.

Then, when the frame cylinder γa is filled, the hopper 6 is moved to the right, a similar frame cylinder 7b is placed adjacent to it, and the same operation is repeated until the required length is reached.

The end edges of adjacent frame tubes 7a, 7b, . . . are fixed to each other by welding or other means.

Thus, the frame cylinder 7a made of a thin iron plate concentric with the high temperature fluid conduit 2
, 7b, . . . , an integral admixture 1 similar to that in Example 1 is pressurized to a required apparent specific gravity of 0.2 to 0.3, and the admixture 1 is After solidification, a seamless heat insulating layer is obtained as in Example 1.

The second embodiment is suitable for use mainly in facilities on the ground.

Embodiment 3 (See Figure 3) When insulating the high-temperature fluid conduit of 200° C. or higher shown in Embodiment 2, a mixed material was placed in the annular gap 8 between the conduit 2 and the frame tubes 1a, 7b made of thin iron plates. After filling the mixed material 1 and solidifying it under pressure, remove the frame tubes 7a, 7b, etc., and apply a waterproof decorative finish 9 to the surface of the solidified mixed material 1 using glass tape, waterproofing agent, waterproof paint, etc. It is something.

This construction is used for above ground facilities where the high temperature fluid conduit 2 is relatively thin.

Example 4 (See Figure 4) In the heat insulating layer of the high-temperature fluid conduit described in Example 3, after removing the frame tubes 7a, 7b..., the waterproof decorative finish 9 was not applied or was applied. Then, a tube 10 made of a heat-shrinkable synthetic resin film is placed over the tube 10, and as in the third embodiment, it is suitable for using a relatively thin high-temperature fluid conduit 2 buried underground.

Example 5 (See Figures 5 and 8) Examples 1 to 4 all relate to insulation construction with a seamless insulation layer for high-temperature fluid conduits of 200°C or higher. 5 is a method for constructing a similar seamless heat insulating layer for containers or equipment containing high-temperature fluids of 200° C. or higher.

FIG. 8 shows a mode of construction. Spacers 12 made of a heat-resistant material are adhered to the outer wall 11 of the container or equipment at appropriate intervals, and a cover plate 13 is placed on top of the spacers 12 for temporary fixing L1.
If necessary, tighten with wires 14 or the like, and then fill the gap 15 between the cover plate 13 and the outer wall 11 with a certain amount of the same mixture 1 as in Example 1, and press with a suitable push rod (not shown). Pressure is applied to a certain limit to solidify, and this process is repeated to form an integral heat insulating layer 16 (see Fig. 5).Then, the cover plate 13 is removed, or the surface of the heat insulating layer 16 is coated from above the cover plate. A moisture-proof and waterproof cosmetic finish is applied.

As seen in the above-mentioned five embodiments, the present invention is designed to prevent fluids and powders from forming in the gap between the outer wall of conduits, containers, and equipment, which are members for high-temperature fluids of 200°C or higher, and the cover spaced apart from each other. Since the mixture is filled with a mixture of perlite and calcined gypsum mixed with water and solidified under pressure to a certain density, a seamless and homogeneous heat insulating layer can be obtained in any of the examples. Therefore, it is possible to overcome the drawback of conventional heat insulating walls in which heat escapes through the seams.

The pearlite used in this construction method can be obtained at an extremely low cost and in inexhaustible quantities by firing pearlite, and can withstand temperatures as high as 600°C, and calcined plaster is also extremely cheap and has no abnormality even at 600°C. .

Construction work can be done anywhere as long as these materials and water are available.

Therefore, it is possible to provide a heat insulating device at a much lower cost and in a shorter period of time than construction using conventional heat insulating cylinders and heat insulating plates.

The heat insulation device according to this method can also be used in other thermal power generation plants.

[Brief explanation of drawings]

Figure 1 shows a heat insulating device using this construction method when the cover for the outer wall of a high-temperature fluid conduit is a concentric synthetic resin pipe. FIG. Fig. 2 shows a heat insulating layer when the cover is a concentric thin iron plate frame cylinder, A is a front view including a partial cross section, and the opening is a sectional view taken along the line B-B. Fig. 3 is a front view showing a state in which the frame tube of the heat insulating layer in Fig. 2 has been removed and a waterproof cosmetic finish has been applied. be. FIG. 4 is a front view showing a state in which the tube shown in FIG. 3 is covered with a tube made of a heat-shrinkable synthetic resin film, and A is a front view including a partial cross section, and the opening is a sectional view taken along line D-D. Fig. 5 shows a heat insulating wall installed on the outer wall of a container or equipment containing high-temperature fluid; A is a front view including a partial cross section;
The mouth is a cross-sectional view taken along the line E-E. Figure 6 is an explanatory diagram showing the construction procedure for the insulation wall in Figure 1.
The figure is an explanatory diagram showing the procedure for constructing the heat insulating layer in FIG. 2, and FIG. 8 is an explanatory diagram showing the procedure for constructing the heat insulating layer in FIG. In the figure, 1 is a mixed material, 2 is a conduit for high-temperature fluid, 3 is a synthetic resin pipe, 4 is an annular gap, 5 is a spacer, 7 is a frame made of a thin iron plate, 6 is a joint of the iron plates, and 8 is an annular gap , 9 is a waterproof decorative finishing layer, 10 is a heat-shrinkable tube, 11 is an outer wall of a high-temperature fluid container or equipment, 12 is a spacer, 13 is a cover plate,
14 is a wire, and 15 is a gap between the outer wall and the cover plate.

Claims (1)

[Scope of Claims] 1. A mixed material made by adding approximately the same weight of calcined gypsum and a small amount of water to granular or powdered pearlite is used on the outer walls of conduits, containers, and equipment for high-temperature fluids of 200°C or higher. It is characterized by filling a certain amount into the gap between the cover and the covering at a distance, pressurizing it to a uniform and constant density, and repeating this process to fill and solidify the gap with a homogeneous and integral heat insulating material. A method of constructing a heat insulating layer for high-temperature fluid components. 2 In the annular gap between the outer wall of the conduit for high-temperature fluids of 200°C or more and the cover made of concentric synthetic resin pipes spaced apart, add approximately the same weight of calcined gypsum and a small amount of water to granular or powdered pearlite. A patent claim characterized in that a certain amount of the mixed material is added and pressurized to a certain density, and this is repeated to fill and solidify the gap with a homogeneous and integral heat insulating material. A method of constructing a heat insulating layer for a member for high temperature fluid according to item 1. 3 Inside the annular gap between the outer wall of the conduit for high-temperature fluids of 200°C or more and the cover of the concentric thin iron plate frame tube with a distance between them, granular,
Powdered pearlite is mixed with approximately the same weight of calcined gypsum and a small amount of water, and then filled in a certain amount at a time, and pressurized to a certain density.This process is repeated to make the inside of the gap homogeneous and integrated. A method for constructing a heat insulating layer for a member for high temperature fluid according to claim 1, characterized in that the material is filled and solidified with a heat insulating material.