JP3196720U - Thermal insulation structure - Google Patents

Abstract

The present invention provides a heat insulation and heat insulation structure that enhances heat insulation by attaching a material having high reflectivity to radiant heat such as aluminum foil on a container such as a tank or a drying furnace or an outer wall side of the furnace. A container 1 such as a tank or a drying furnace or a chemical fiber sheet 2 such as polyester or glass on the surface of an outer wall of a furnace or the like, and a high reflectivity with respect to radiant heat such as aluminum foil laminated on the outside of the chemical fiber sheet. A heat insulating and heat insulating structure in which a heat insulating material 3 having the above material is closely attached, and a chemical fiber sheet so that a static air layer is not formed between the outer wall surface of the container and a material having high reflectivity with respect to radiant heat. Is glued or welded. The material having a high reflectivity with respect to radiant heat is 7 to 15 microns, and the total thickness including the chemical fiber sheet is 0.2 mm or less. [Selection] Figure 1

Description

  The present invention provides a heat insulation and heat insulation structure that prevents heat from a container, a furnace, or the like, such as a tank, a pipe, or a drying furnace.

Conventionally, most tanks, pipes, drying ovens, and the like are covered with glass wool or rock wool heat insulating material, and sheet metal processed from there.
For example, there is a heat insulating cover in which the outer surface side of the heat insulating material is covered with an aluminum foil, a stainless steel thin plate, etc., and a hook is provided at an appropriate location. This heat shield cover is configured to fix an overlapping portion with a hook when wound around the outer periphery of an exhaust pipe or the like (see Patent Document 1).

Registered Utility Model No. 3110394

Therefore, there were the following problems.
In a tank, piping, a container such as a drying furnace, a furnace, or the like, a fluid such as gas or liquid flows or is stored therein. If the temperature inside these containers and furnaces is higher than the outside air temperature, the heat moves from the inside to the outside. In addition, the heat transferred from the surface of the container or furnace to the outdoor side is in three forms of conduction heat, convection heat, and radiant heat, but the amount of radiant heat is the largest.

  In order to prevent the heat moving from the container or the furnace to the outdoor side, a heat insulating material such as glass wool or rock wool is used outside the container or the furnace. However, although these heat insulating materials have a large effect of blocking conduction heat, it is difficult to block convection heat and radiant heat, and there is a problem that a sufficient heat retention effect cannot be expected.

  Glass wool or rock wool insulation is made of a fiber made of mineral and made into a cotton-like material, and there is a problem that the heat insulation performance is greatly reduced when wet. In addition, when objects collide with each other, they may be easily damaged, and the surroundings of the container and the furnace have to be covered with a metal plate, resulting in an increase in cost.

  In addition, increasing the heat insulating property increases the density and thickness of the heat insulating material, but there is a problem that the volume increases and an extra space is required.

  Moreover, in the structure like patent document 1, since winding is fixed in the location which provided the hook, a clearance gap arises in the most locations which do not provide the hook. Moreover, since the stress generated by winding is not uniform, a space may be generated between the heat insulating material and the exhaust pipe. Therefore, radiant heat is radiated to the outside from these gaps and the like, and there is a problem that it is difficult to obtain a high heat shielding effect and a heat retaining effect.

  The present invention has been made to solve these problems.

  The heat insulation and heat retention mechanism according to the present invention is applied to the surface of the outer wall of a container such as a tank, a drying furnace or the like, or a chemical fiber sheet such as polyester or glass, and radiant heat laminated on the outside of the chemical fiber sheet such as polyester or glass. A heat insulation structure in which a heat shielding material having a high reflectivity material is in close contact with each other, wherein the heat shield material is between the outer wall surface of the container and the material having a high reflectivity with respect to the radiant heat. In addition, a chemical fiber sheet such as polyester or glass is bonded or welded to a material having a high reflectivity with respect to the radiant heat so as not to generate a static air layer, and highly reflective to the radiant heat having a thickness of 7 to 15 microns. The total thickness including the material of the rate and the chemical fiber sheet such as polyester and glass is formed to be 0.2 mm or less.

  In addition, a high-polymer resin-based high polymer resin film that prevents electrolytic corrosion is attached to the surface of a material having a high reflectance with respect to the radiant heat.

  The biggest merit of the present invention is that a heat shielding material having an outer surface made of a material having a high reflectivity with respect to radiant heat is directly attached to the outside of a vessel such as a tank or a drying furnace or the outer wall material of the furnace without providing an air layer. It is to produce a big energy saving effect.

  A heat shield with an outer surface made of a material highly reflective to radiant heat is applied directly to a tank, etc. with a thickness of only 0.2 millimeters or less, so there is no need for sheet metal work to protect the heat insulation layer, greatly reducing costs. I can do it. Also, no extra space is required.

  For example, a heat insulating material having an outer surface made of a material having a high reflectivity with respect to radiant heat, for example, an outer wall material such as a container or a furnace (when a heat insulating layer is already provided on the outer wall material such as a container) Since it can be simply applied to the outside) with an adhesive or adhesive tape, anyone can easily perform the work, and this can greatly reduce costs.

It is sectional drawing which attached the raw material of a high reflectance with respect to radiant heats, such as aluminum foil, to a tank. It is explanatory drawing which shows the temperature measuring method by the thermal-insulation test. It is explanatory drawing which shows the time-dependent change of the measured temperature by the thermal-insulation test 4. FIG. It is explanatory drawing which shows the temperature measuring method by a heat retention test.

Hereinafter, the best mode for carrying out the present invention will be described.
Heat transferred from the tank 1 or piping or a container such as a drying furnace or the furnace to the outdoor side takes three forms of conduction heat, convection heat, and radiant heat, and the amount of radiant heat is said to be the largest.
As a method for cutting off this radiant heat, it is also known that a material having high reflectivity with respect to radiant heat such as aluminum foil is effective.

  A material having high reflectivity with respect to radiant heat, such as aluminum foil, has a large purpose of reflecting with respect to radiant heat. Therefore, an air layer is generally provided on the heat irradiation side. In other words, it is recommended to install a static air layer, that is, a space, between a tank, piping, or the outer wall of a container such as a drying furnace or a furnace, and a material having high reflectivity against radiant heat such as aluminum foil. ing.

  However, the present invention is based on a completely opposite concept to that of the prior art, and enables high-performance heat insulation regardless of the presence of a static air layer, that is, a space.

  The sum of the reflectance plus emissivity of a material against radiant heat is 壱. For example, in the case of aluminum foil, the reflectivity for radiant heat is about 98%, but the emissivity in this case is only 2%. That is, only a little heat is radiated.

(Example)
FIG. 1 shows an embodiment of the heat insulation and heat insulation structure of the present invention, and is a cross-sectional view in which a material having a high reflectance with respect to radiant heat such as aluminum foil is attached to a tank.
In this embodiment, a material having high reflectivity with respect to radiant heat, such as the aluminum foil 3, is directly attached to the outside of the outer wall of a tank 1, a pipe, a container such as a drying furnace, or a furnace. At this time, the tank 1, the pipe or the outer wall of a container such as a drying furnace or the furnace, and the aluminum foil 3 or the like are attached in close contact with the material having high reflectivity with respect to the radiant heat. If there is air or the like between the outer wall of the tank 1, piping or drying furnace or the like and the outer wall of the furnace, etc., and the aluminum foil 3, etc., the material such as the tank 1, piping or drying furnace, The heat from the furnace moves to this air, and is further conducted to the material having high reflectivity with respect to the radiant heat such as the aluminum foil 3 on the outside, and the atmosphere from the outer surface of the material having high reflectivity with respect to the radiant heat such as the aluminum foil 3 As a result, heat efficiency is reduced.

The mechanism of the present invention will be described in detail by taking the tank 1 as an example.
When the temperature inside the tank 1 is higher than the outside air temperature and the substance inside is a gas, the heat inside the tank 1 is transferred to the outer wall of the tank 1 in the form of conduction heat, convection heat, and radiation heat. Further, when the substance inside the tank 1 is a liquid, it is transmitted to the outer wall of the tank 1 in the form of conduction heat and convection heat. The heat transferred to the outer wall of the tank 1 takes the form of conduction heat and moves to the surface of the outer wall of the tank 1, and again takes the form of conduction heat, convection heat and radiation heat and is transferred from the surface of the outer wall of the tank 1 to the atmosphere.

  At present, the heat insulation method applied to the outside of the tank 1 is attached so that rock wool or glass wool is wound around the outside of the outer wall of the tank 1, and is further fixed from the outside with a wire mesh or the like. However, in the first place, these fiber-based heat insulating materials prevent conduction heat by containing a large amount of air inside. Therefore, the more air contained in the heat insulating material, the more easily the radiant heat passes. If radiant heat radiated from the outer wall surface of the tank 1 is applied to rock wool or glass wool, the rock wool or glass wool absorbs this radiant heat and is radiated again to be radiated to the outdoor side. Therefore, although rock wool and glass wool are effective against conduction heat, it is difficult to almost prevent radiation heat. In general, the reason why the reflectivity of the heat insulating material with respect to radiant heat is said to be 5 to 10% is the correct reason.

  In the present invention, a still air layer is not provided on the outdoor side of the outer wall of the tank 1, and a material having high reflectivity with respect to radiant heat such as the aluminum foil 3 is attached. It is possible to sufficiently bring out the low radiation performance of the aluminum foil 3 by bringing a material having high reflectivity against the radiant heat such as the aluminum foil 3 into close contact with the outer wall of the tank 1.

  Aluminum foil 3 etc. As a material having high reflectivity with respect to radiant heat, aluminum foil 3 or the like is generally used. However, the reflectivity with respect to radiant heat is preferably at least 95%, and if the reflectivity is high, it is more preferable. High performance can be extracted.

A material having a high reflectivity with respect to radiant heat such as the aluminum foil 3 has a sheet 2 of chemical fiber such as polyester or glass bonded or welded to one side of the aluminum foil 3 or the like. The chemical fiber sheet 2 such as polyester and glass is sandwiched between the material having high reflectivity against the radiant heat such as the tank 1 and the aluminum foil 3, but these sheets 2 are greatly overlapped with fibers. Heat insulation can be improved.
Furthermore, the fact that conduction heat is reduced means that convection heat is also reduced, which can produce a large heat retention effect.

  The thickness of the aluminum foil 3 is about 7 to 15 microns, while the chemical fiber sheet 2 such as polyester or glass is also used by being compressed to about 0.1 mm. The thickness of the heat shielding material having a material having a high reflectivity with respect to radiant heat, such as the aluminum foil 3, may be, for example, about 0.1 mm or less to 4.0 mm, but is preferably 0.2 mm or less.

When the tank 1 or pipe container or furnace is made of metal, galvanic corrosion occurs between the aluminum foil 3 and other materials that have high reflectivity for radiant heat, and the aluminum foil 3 and other materials that have high reflectivity for radiant heat. Corrosion may occur in the material. However, in the present invention, since the chemical fiber sheet 2 such as polyester and glass is used between the tank 1, the container such as the pipe, the furnace, and the aluminum foil 3 and the like, which has a high reflectivity against the radiant heat, there is no concern about this. .
As described above, the heat shielding material in which the material having high reflectivity with respect to radiant heat such as the aluminum foil 3 and the chemical fiber sheet 2 such as polyester or glass is laminated is a container of the tank 1 or the like, an outer wall material such as a furnace or a pipe. It is affixed by using an adhesive or an adhesive tape on the outside (in the case where a heat insulation layer is already provided on the outside of the outer wall material such as a container, on the outside).

  In addition, when a material having high reflectivity against radiant heat such as a tank 1, a pipe or a container such as a drying furnace or an aluminum foil 3 attached to the outside of the furnace is in contact with an external metal, there is a risk of electrolytic corrosion. In this case, it is necessary to cope with this by attaching a high polymer polymer type highly transparent resin film or the like to the surface of the material having high reflectivity with respect to radiant heat such as the aluminum foil 3.

  This polymer poly-based high-permeability resin film can also prevent corrosion from chemical substances such as alkaline.

  When the internal temperature of the tank 1 or piping is lower than the outside air temperature, the heat flow goes from the outdoor side to the tank 1 or the inside of the piping. Also in this case, radiant heat from the outdoors can be reflected, and a large heat retaining effect can be obtained.

[Thermal insulation test 1]
A heat shield material (THB-CX) with a thickness of 0.1 mm was cut and pasted to a part of the outer surface of a 10 liter kettle containing boiling water, and the temperature was measured by thermography. .

[Result 1]
Although the outer wall temperature of the kettle in the non-heat-shielded part was 95.3 ° C., the surface temperature of the 0.1 mm-thick heat shield (THB-CX) was 28.2 ° C.

[Discussion 1]
The temperature difference between the heat shielding construction of 0.1 mm and the untreated part is as high as 67.1 ° C., and it can be clearly confirmed that there is a large heat retention effect. Of course, pressing the surface of the heat shield with your finger picks up the temperature inside the kettle, so you feel the heat, but when you take your hand away from the kettle about a centimeter, you feel no heat at all.

[Thermal insulation test 2]
A heat shielding material (THB-CX) having a thickness of 0.1 mm was cut and pasted on a part of the outer surface of a 10 liter kettle containing ice, and the temperature was measured by thermography.

[Result 2]
Although the outer wall temperature of the kettle in the heat shield unapplied portion was 47.9 ° C., the surface temperature on which the 0.1 mm-thick heat shield (THB-CX) was pasted was 24.8 ° C.

[Discussion 2]
The kettle surface temperature difference between the heat shield construction and the untreated part is as high as 23.1 ° C, and it can be clearly confirmed that there is a large heat retention effect.

[Thermal insulation test 3]
A heat shielding material (THB-CX) having a thickness of 0.1 millimeter cut to a size of 1 meter square was attached to the outdoor side of the paint component drying furnace, and the surface temperature was measured by thermography.

[Result 3]
The temperature inside the building was 20 ° C. The surface temperature of the non-heat-shielded drying furnace was 45.1 ° C, while the surface of the heat-shielded construction was 24.5 ° C.

[Discussion 3]
As with the temperature measurement of the tank, it was found that the temperature difference between the heat shielding construction part and the non-working part is 20.6 ° C., which has a large heat retention effect.

[Heat insulation test 4]
A heat shielding material (THB-FX, THB-X, THB-CX) is directly attached to a furnace body such as a drying furnace, and the heat shielding performance depending on the thickness and type of the heat shielding material is verified.

  FIG. 2 is an explanatory view showing a temperature measuring method by the heat shielding test 4. The heater 11 is a far-infrared heater with a rating of 1000 W, for example. The iron plate A that looks like a furnace body is a galvanium steel plate (surface black) having a size of 300 × 300 × 0.8 mm. The iron plate A is fixedly installed at an appropriate distance from the heater 11. Heat shielding materials B, C, and D are directly attached to the surface of the iron plate A on the back side of the heater 11. That is, a state in which the heat shielding materials B, C, and D are pasted on the indoor side (outer surface of the furnace body) is artificially generated. The thermal insulation material B is THB-FX having a thickness of 0.2 millimeters, the thermal insulation material C is THB-X having a thickness of 0.2 millimeters, and the thermal insulation material D is THB-CX having a thickness of 0.1 millimeters. It is. In addition, each heat shield material B, C, D is affixed on the iron plate A using the double-sided tape etc. with heat resistance.

  The temperature sensor 12 is wired to a thermo recorder or the like that records measured temperatures at a plurality of locations. Each of the heat shielding materials B, C, and D has an aluminum foil on the outer surface (outdoor surface). The heat shield B was peeled off the outer aluminum foil B1, the temperature sensor 12 was attached to the main body of the heat shield B, and the temperature was measured with the temperature sensor 12 covered with the aluminum foil B1. For the heat shield C, the outer aluminum foil C1 was peeled off, the temperature sensor 12 was attached to the main body of the heat shield C, and the temperature was measured with the temperature sensor 12 covered with the aluminum foil C1. Since the outer aluminum foil is difficult to peel because of the structure of the heat shield D, the temperature sensor 12 is attached to the aluminum foil surface of the heat shield D, and the surface of the heat shield D to which the temperature sensor 12 is attached is aluminum foil. The temperature was measured while covered with D1. Moreover, the temperature sensor 12 (illustration omitted) was attached to the suitable location of the iron plate A, and the heater 11 side temperature measurement of the iron plate A was performed. The test was conducted in an environment where the room temperature was 21.0 ° C. and the humidity was 41%.

[Result 4]
FIG. 3 is an explanatory view showing the change over time of the measured temperature in the heat shielding test 4. FIG. In the figure, the vertical axis represents the measurement temperature (° C.), and the horizontal axis represents the elapsed time (minutes).
Table 1 below shows the temperature measured at each part by the temperature sensor 12 when the iron plate A is heated by the heater 11. Each numerical unit in Table 1 is [° C.].

Each temperature of the iron plate A, the heat shield B, the heat shield C, and the heat shield D measured by thermography is shown below. “Iron plate A” in the following (1) to (5) is the temperature of the surface of the iron plate A to which the heat shielding materials B, C, D are attached. In addition, the following “heat shielding material B” is the temperature of the outer surface of the aluminum foil B 1 covering the temperature sensor 12. In addition, the following “heat shielding material C” is the temperature of the outer surface of the aluminum foil C 1 covering the temperature sensor 12. Moreover, the following “heat shielding material D” is the temperature of the outer surface of the aluminum foil D 1 covering the temperature sensor 12.
(1) Iron plate A: At 30.0 ° C
Heat shield material B: 19.2 ° C. Heat shield material C: 21.5 ° C. Heat shield material D: 19.7 ° C.
(2) Iron plate A: at 50.0 ° C
Heat shield material B: 21.2 ° C. Heat shield material C: 22.3 ° C. Heat shield material D: 20.4 ° C.
(3) Iron plate A: at 70.0 ° C
Heat shield material B: 21.4 ° C. Heat shield material C: 23.0 ° C. Heat shield material D: 22.8 ° C.
(4) Iron plate A: At 90.0 ° C
Heat shield material B: 22.4 ° C. Heat shield material C: 23.9 ° C. Heat shield material D: 23.2 ° C.
(5) Iron plate A: At 110.0 ° C
Heat shield material B: 23.4 ° C. Heat shield material C: 24.7 ° C. Heat shield material D: 24.0 ° C.

[Discussion 4]
In the measurement by the temperature sensor 12, when the temperature of the iron plate A, that is, the heat source side is 100.1 ° C., the temperature of the heat shielding materials B, C, D becomes 85.1-88.2 ° C., and 11.9-15.0 ° C. Temperature difference occurs. It can be seen that any heat shield temperature is proportional to the temperature rise of the furnace body (iron plate A), and the heat source side temperature moves to the aluminum foil surface of each heat shield.
Further, the inner temperature of the outer aluminum foil of each heat shielding material measured by the temperature sensor 12 is almost the same temperature as that of the heat shielding material C (THB-X) and the heat shielding material D (THB-CX). It can be seen that material B (THB-FX) is slightly lower. From this measurement result, it can be seen that, in the above-described heat shielding tests 1 to 3, even when THB-FX and THB-X are used as the heat shielding material, substantially the same results are obtained.
Moreover, even if the temperature of the furnace body (iron plate A), that is, the temperature on the heat source side is increased by 90 ° C. from 18.9 ° C. to 108.9 ° C. from the measurement results by the temperature sensor 12 and the thermography, The temperature rises to about 3 to 4 ° C., and the high heat insulating properties of the heat shielding materials B, C, and D are solved.

[Insulation test]
It is verified whether or not the heat insulation performance can be ensured when the furnace body surface temperature is 150 ° C. or higher.

  FIG. 4 is an explanatory diagram showing a temperature measurement method by a heat retention test. In the figure, the heater 11 and the iron plate A are the same as those used in the thermal insulation test 4, and are similarly installed and fixed. In the iron plate A of FIG. 4, aluminum foils E and F are attached to the rear surface of the heater 11 with appropriate separation. The aluminum foils E and F are, for example, 7 microns thick, and the aluminum foil E has, for example, only its outer peripheral part adhered to the surface of the iron plate A, and the aluminum foil F has one surface entirely on the surface of the iron plate A. Glued. That is, the aluminum foil E is provided with an air layer and bonded to the iron plate A, and the aluminum foil F is directly bonded to the surface of the iron plate A on one side. The temperatures of these aluminum foils E and F and the iron plate A were measured by a radiation thermometer and thermography. The test was conducted in an environment where the room temperature was 23.5 ° C. and the humidity was 33%. The thermography used here can measure up to 150 ° C.

[result]
Table 2 below shows the temperatures of the measurement points a, b, and c when the iron plate A is heated by the heater 11. Each numerical unit in Table 2 is [° C.].

[Discussion]
In the measurement with the radiation thermometer, when the temperature of the iron plate A is 171 ° C., the surface temperature of the aluminum foils E and F is 39.4 to 32.2 ° C., and the high heat retention performance of the aluminum foil is found. Also, it can be seen that the thermal insulation performance has the same tendency even in the measurement by thermography, although there is a difference of 3 to 4 ° C. compared with the case of using the radiation thermometer.
In this test, the temperature of the aluminum foil F that was completely adhered to the iron plate A was lower by 5 to 7 ° C. than the aluminum foil E provided with an air layer.

  The heat insulation and heat insulation structure of the present embodiment shown in FIG. 1 is a structure in which a heat insulation material is brought into close contact with a furnace body, etc. As can be understood from the results of the heat insulation test, a material such as aluminum foil is used in the furnace body. A constant heat retention effect can be obtained even when they are in close contact. When it is necessary to obtain a higher heat retention effect, for example, between the material having high reflectivity against radiant heat such as aluminum foil on the outer surface of the heat shield, and a synthetic fiber sheet such as polyester or glass laminated on the material. Further, it is preferable to provide a space such as an air layer. In addition, as for the above-mentioned thermal-insulation tests 1-4, all tested by the thermal-insulation material which made the material of high reflectance with respect to radiant heat, such as aluminum foil, and chemical fiber sheets, such as polyester and glass, stuck. .

1 tank 2 sheets 3 aluminum foil 11 heater 12 temperature sensor

Claims (2)

On the outer wall surface of a container such as a tank or a drying furnace or a furnace,
Chemical fiber sheets such as polyester and glass, and a material having a high reflectivity with respect to radiant heat laminated on the outside of the chemical fiber sheets such as polyester and glass,
A heat insulation and heat insulation structure in which a heat insulation material having
The heat shield is
The polyester or glass or other chemical fiber sheet is bonded to the material having high reflectivity with respect to the radiant heat so that a static air layer is not formed between the outer wall surface of the container and the material having high reflectivity with respect to the radiant heat. Has been welded,
A material having a high reflectivity with respect to the radiant heat having a thickness of 7 to 15 microns and a total thickness including the chemical fiber sheet such as polyester and glass are formed to be 0.2 mm or less.
Thermal insulation structure characterized by that.   2. The heat insulating and heat insulating structure according to claim 1, wherein a high polymer resin-based high-permeability resin film or the like for preventing electric corrosion is attached to a surface of a material having a high reflectivity with respect to the radiant heat.

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