JPS6044593B2 - Insulation construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing a heat insulating material using a fibrous heat insulating material sheet.

When a felt sheet made of fibrous insulation material such as rock wool fiber, asbestos fiber, or ceramic fiber is attached to the furnace inner wall in layers to retain heat, felt sheets made of fibrous insulation material such as rock wool fiber, asbestos fiber, or ceramic fiber are supplied to the market as before. When used as is (unrolled or cut to required dimensions, etc.), fibrous insulation sheets often cause delamination in a short period of time due to thermal expansion and contraction due to the operating history of the furnace. However, the initial heat retention of the furnace body is significantly reduced.

In addition, due to a decrease in bending strength due to delamination, the fibrous heat insulating sheet may break off from the inner wall of the furnace, resulting in a significant decrease in the heat retention effect of the furnace body. The present invention solves the problems of the conventional insulation material construction method described above, and provides a fibrous insulation material that increases bending strength and improves heat retention without causing delamination of the insulation material due to the operating history of the furnace body. This provides a construction method.

The method of the present invention involves cutting a commercially available fibrous insulation sheet into rectangular pieces with a width of 1 to 5 times its thickness, and laminating the cut pieces (the width of the cut pieces is equal to the width of the laminate). The laminate is stacked in two layers and attached to the heat insulating surface using a probe pin via an asbestos layer that has been spray-bonded to the heat insulating surface of the furnace body in advance. The surface of the laminate (
A laminate similar to the above (third layer) is adhered onto the second layer (high temperature side) using a heat-resistant adhesive to form a heat insulating material module.

Next, details of the method of the present invention will be explained with reference to the figures.

FIGS. 1 and 2 are explanatory diagrams of the insulation material construction method of the present invention, where FIG. Sheet 1 (
The thickness of the original sheet).

In the method of the present invention, the original sheet is not simply cut into required dimensions and pasted onto a flat surface, but is first cut into rectangles and used as a laminate. Figure 1 shows the state of the cutting. In figure b, P, Po, Po... each indicate a rectangular cut piece, A is the thickness of the original sheet, B is the cut width, and the value of B/A is 1 to 5. FIG. 1c shows the stacked state of the cut pieces.

The laminate t is made by laminating the cut pieces Pl, P2, P3, . . . They are stacked so that they form a plane of contact and the width B of the cut pieces forms the thickness of the laminate. FIG. 2 shows a state in which the laminate of the fibrous heat insulating material sheets is attached to the steel shell of the furnace body to be kept warm, and in the figure, 2 is the steel shell.

When installing the laminate, an asbestos layer 4 is made in advance on the heat insulation construction side of the steel skin 2 by spraying and adhering it through the lath 3. Next, the two layers (t1 and T2) of the laminate are
By overlapping the surface of the asbestos layer 4 and driving and anchoring the binding pins 5 with a tool, it is connected to the asbestos layer and hence to the iron skin. Next, one layer of the laminate is attached to the surface of the laminate (the surface of T2) using a heat-resistant adhesive such as a fire-resistant mortar, thereby creating a heat insulating module according to the method of the present invention. Complete the installation work. Note that a metal foil such as aluminum foil may be interposed between the adhesive layers made of the heat-resistant adhesive, either entirely or locally.

Metal foil reflects radiant heat from the heat insulating surface and is therefore effective in preventing layer delamination of the module. Furthermore, the adhesive shall be used to the minimum extent necessary to construct the module. Next, the effects of the method of the present invention will be described.

By carrying out heat insulation construction according to the method of the present invention, the high temperature bending strength of the heat insulating material layer was able to be improved by more than five times (more than 10 kgIc71!), which was conventionally about 2k91cIt.

In addition, even if one cut piece in the laminate peels off, the peeling does not affect other cut pieces, so the whole laminate is not affected, and heat retention performance can be ensured. In the present invention, the value of the width B/thickness A of the cut pieces of the heat insulating sheet is set to 1 to 5, but if this exceeds 5, the high temperature bending strength of the laminate will decrease as shown in Figure 3a. , and if it is less than 1, the heat transfer coefficient increases as shown in FIG. 3b, so both are unfavorable. (In the case of the co-ceramink fiber module in Figure 3A and b, the changes at 900°C are shown.) As described above, the method of the present invention has a high heat retention performance that does not cause delamination due to the influence of the furnace operating history. It provides a stable insulation module and has extremely high industrial value.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the process of forming a laminate of heat-insulating sheets in the method of the present invention in the order of A, b, and c. FIG. 2 is a diagram showing a state in which heat insulation modules are assembled according to the method of the present invention. Figures 3A and 3b are diagrams showing changes in high temperature bending strength a and heat transfer coefficient b due to changes in the width B/thickness A of the unit shreds constituting the heat insulating sheet laminate in the method of the present invention. It is. 1...Original sheet, A...Original sheet thickness, B...Cut width, P1 to Pn...Cut pieces,
t(Tl, t2, t3)...Laminated product, 2...
... Iron skin, 3 ... Lath, 4 ... Asbestos layer, 5 ... Stitching pin.

Claims (1)

[Claims] 1 A fibrous heat insulating material sheet is cut into rectangles with a width of 1 to 5 times its thickness, the rectangular cut pieces are laminated to form a laminate, and the laminate is adhered to a heat-insulating surface in advance to form an asbestos layer. using a binding pin, with the binding pin separated from the heat-retaining surface,
A heat insulation module characterized in that a laminate similar to the above is attached to the surface of the attached laminate using a heat-resistant adhesive with a metal foil interposed therebetween to form a heat insulating material module. Material construction method.