JPS6144073Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat insulation structure for ultra-high temperature fluid transport piping.

Piping that transports high-temperature thermal fluid undergoes thermal expansion corresponding to the operating temperature during operation, and linear expansion in the length direction of the piping causes damage between the molded insulation materials of the insulation structure attached to the piping. Gaps were formed and heat loss tended to increase. In order to solve these problems, conventionally, elastic heat-resistant joint materials such as asbestos, rock wool, etc. are compressed and stuffed into the longitudinal joints of the molded insulation materials that make up the insulation structure. It has been proposed to prevent the formation of gaps by utilizing the restoration expansion of the joint material. However, for example, in stainless steel piping with an internal temperature of 500°C,
Because the linear expansion rate per meter is approximately 9 cm, the linear expansion rate is quite large, so with this conventional construction method,
Even if the compressed joint material fully recovers and expands, it will not be able to fully fill the gaps, and the heat loss prevention effect will not be sufficient. It was necessary to fill the joint with joint material, which required a considerable amount of work and caused major problems during construction. Furthermore, in the past, when assembling a heat-retaining structure, each molded heat-insulating material was secured to the piping using a wire, but in such a structure, when the pipe expands at high temperatures (during operation), the wire stretches. However, when it shrinks at low temperatures (when not in operation), the molded heat insulating material is attached in an extremely unstable manner.

The present invention was made with the aim of eliminating all of these conventional problems. Specifically, the present invention stacks inorganic molded heat insulating materials vertically in multiple stages, and also mutually interconnects the molded heat insulating materials for each layer. A heat insulating structure for pipes for transporting ultra-high temperature fluids, which is assembled by connecting and integrating them in the longitudinal direction using metal fittings such as nails and screws. The heat insulation structures between the unconnected parts are independent, and the expansion and contraction in the longitudinal direction of the piping due to thermal expansion and contraction is compensated by opening and closing of the unconnected parts. Furthermore, in order to prevent heat radiation from the open unconnected parts, a cylindrical heat insulating body made of inorganic fiber is placed around the outer periphery of the unconnected parts of the heat insulating structure. The present invention relates to a heat insulation structure for ultra-high temperature fluid transport piping, characterized in that it is covered so that it can follow the opening and closing movements of a connecting part.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a heat insulating structure provided on a pipe a used for transporting an ultra-high temperature fluid, such as superheated steam. It is assembled using calcium silicate molded heat insulating material 1a with a density of 0.15 g/cm3 or ^less .

The molded heat insulating material 1a constituting the heat insulating structure 1 is obtained by dividing a cylindrical body with a predetermined outer diameter into a plurality of pieces, for example, about 3 to 6 pieces, and has a joint in the length direction of the pipe a. 1b (see Figures 2 and 3), and are stacked vertically in multiple stages, and in each layer, at the longitudinal seam 1b, there is a glazing 2a (see Figure 2). ) and nail 2b (see Figure 3)
At this time, it is preferable that the seams 1b of each layer are slightly staggered in a stepwise manner as shown in the figure. Note that the circumferential seam 1c (first
It is advantageous to leave the piping (see figure) free in order to follow the thermal expansion in the radial direction of the pipe a, but in some cases it may be integrally connected in the same way as the longitudinal joint 1b. In addition, a thin metal plate 3 (shown only in FIG. 1) with a glossy surface such as aluminum foil or stainless steel foil is interposed between each layer of the heat insulation structure 1 to prevent heat loss due to thermal radiation. You can keep it equipped. 1st
In the figure, numeral 4 is a wire that ties the molded heat insulation plate 1a to the pipe a for each layer, and 5 is an outer skin that covers the outermost layer of the heat insulation structure 1. The outer skin 5 is generally made of an aluminum plate or a zinc plate. A metal plate such as a drawn iron plate is used.

The heat insulation structure 1 assembled in this way has unconnected parts 6 with stepped cross sections that open and close following the expansion and contraction of the pipe a in the length direction due to thermal expansion and contraction, at appropriate intervals, e.g. 5-15m, advantageously 10
They are formed at intervals of about m. Such an unconnected portion 6 having a stepped cross-section can be easily formed, for example, by using the longitudinal seams 1b and leaving the seams 1b' free at predetermined locations, as shown in the figure. However, in some cases, parts other than the seam 1b' may be formed by appropriate means such as cutting. Due to the formation of the unconnected portions 6, the heat retaining structure 1 becomes independent between the unconnected portions 6, 6, so the outer skin 5 is provided for each independent heat retaining structure 1.

When the uncoupled portion 6 of the heat insulation structure 1 is opened following the extension in the length direction due to thermal expansion of the pipe a,
In order to prevent heat radiation from the opened non-coupled portion 6, a cylindrical heat insulator 7 made of inorganic fiber can follow the opening and closing movement of the non-coupled portion 6 so as to surround the outer periphery of the non-coupled portion 6. It will be covered like this.

As a means for forming the cylindrical heat insulating body 7, inorganic fibers such as rock wool or glass fibers are wound around the outer periphery of the unconnected portion 6 in a layered manner, and the cylindrical inorganic fibers formed in this way are For example, the fiber layer 7a may be covered with an outer skin 7b made of a metal plate.
In this case, it is desirable that the inorganic fiber layer 7a be compressed and filled within the outer skin 7b.

In addition, as a means for causing the cylindrical heat insulating body 7 to follow the opening and closing movements of the non-coupling portion 6, one end of the cylindrical heat insulating body 7 (the left side in FIGS. 4 and 5) is attached with a nail 3 or the like in the figure.
A case is shown in which it is fixed to one end of the heat retaining structure 1 and the other part is freely covered by the heat retaining structure 1 on the other side. In this case, the covering length is determined to be a length that can sufficiently accommodate the maximum distance that is expected to occur in the unconnected portions 6.

In the heat retaining structure of the present invention having the above-described configuration, when the heat retaining structure is not in operation (at low temperature), the non-connecting portion 6 between the heat retaining structures 1 is closed as shown in FIG. 4.

On the other hand, during operation, when the pipe a is heated by the ultra-high temperature fluid flowing inside and expands thermally and extends in the longitudinal direction, the unconnected portion 6 between the heat insulating structures 1 and 1 opens following this extension. , this elongation is corrected and absorbed in each unconnected part 6 for each unit, with the piping length between the unconnected parts 6 being one unit.
At this time, a gap 6a is created in the unconnected part 6 as shown in FIG. 5, but this interval 6a becomes discontinuous in the radial direction due to the step-like shape of the unconnected part 6, and furthermore, the outer end of the interval 6a is isolated from the outside air by the cylindrical heat insulating body 7 made of inorganic fibers, so that heat dissipation through the interval 6a can be effectively prevented.

In this case, as shown in FIG. 5, by setting the positions of the unconnected parts 6 of each layer so that the intervals 6a occur independently in each layer, heat radiation can be prevented even more effectively. .

In this way, in the present invention, the expansion and contraction in the length direction due to thermal expansion of the ultra-high temperature fluid transport pipe a is
Since the heat insulating structure 1 is configured to compensate for the opening and closing movements of unconnected parts 6 formed at appropriate intervals, for example, about 10 m, construction work to cope with such expansion and contraction of piping a is required. The construction can be significantly simplified by simply applying the above to the heat insulating structure at intervals of about 10 m, and the spacing 6a formed by the extension of the pipe a can be applied to the unconnected body 6 of the heat insulating structure 1. Since the structure is such that it is shielded from the outside air by the covered cylindrical heat insulating body 7, by appropriately setting the covered length, it can be used in cases where the coefficient of linear expansion is high and a large gap 6a occurs. However, this can be easily dealt with, and heat dissipation from the space 6a can be reliably prevented. Furthermore, since the main constituent parts of the cylindrical heat insulating body 7 are made of inorganic fibers, it can be easily adhered to the outer circumferential surface of the heat insulating structure 1, and a high heat radiation prevention effect can be obtained.

Furthermore, in the present invention, the molded heat insulators 1a are connected and integrated in the length direction using nails, screws, etc., so even if the pipe a is repeatedly expanded and contracted, the molded heat insulators 1a will not change in length. There is no possibility of separation in the direction, and a robust heat-retaining structure can be provided.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway perspective view thereof, and FIGS. 2 and 3 are main parts showing a specific example of the lengthwise connection and integration means of the molded heat insulating material. FIG. 4 and FIG. 5 are enlarged cross-sectional views of main parts showing the state of opening and closing of the uncoupled portion, and FIG. 6 is an explanatory view showing the arrangement spacing of the cylindrical heat insulators. In the figure, 1 is the heat insulation structure, 2a is the glazing,
2b is a nail, 3 is a thin metal plate, 4 is a wire, 5 is an outer skin,
6 is a non-connecting portion, and 7 is a cylindrical heat insulating body.

Claims (1)

[Scope of Claim for Utility Model Registration] Inorganic molded heat insulating materials are stacked vertically in multiple stages, and the molded heat insulating materials for each layer are connected and integrated in the longitudinal direction using metal fittings such as nails or gaiters. A heat insulating structure for ultra-high temperature fluid transport piping, the heat insulating structure having non-connected portions with a stepped cross section at appropriate intervals in the longitudinal direction, and a heat insulating structure between the non-connected portions. are independent from each other, and are configured so that expansion and contraction in the longitudinal direction of the piping due to thermal expansion and contraction is compensated for and absorbed by opening and closing of this unconnected part, and furthermore, In order to prevent heat radiation, a cylindrical heat insulating body made of inorganic fiber is placed around the outer periphery of the unconnected part of the heat insulating structure so that it can follow the opening and closing movements of the unconnected part. Features a heat-retaining structure for ultra-high temperature fluid transport piping. The ultra-high temperature fluid transport device according to claim 1 of the utility model registration claim, characterized in that a thin metal plate with a glossy surface, such as aluminum foil or stainless steel foil, is interposed between each layer of the heat-retaining structure. Heat insulation structure for piping.