JPH10170692A - Box-type heat insulating panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower a surface temperature of a heat insulating panel, and shorten a periodic inspection period by filling a heat insulating material inside a box body, arranging a hollow flat refrigerant passage member to cover a great part of its plate in a part close to the box face plate side where the box body is turned to a heat insulating part, and forcedly flowing air in the passage member. SOLUTION: A box-type heat insulating panel is used in a part opposit to a heat source part D. When the heat source part D is operated, an opening part 2a from which a refrigerant blowing-off box-shaped nozzle member C1 is pulled out and an outlet of a passage part 4, are closed by a heat insulating material. For example, when the heat insulating panel is removed at periodic inspection time, the closing heat insulating material is removed, and the box-shaped nozzle member C1 is fitted and inserted, and air is flowed in a hollow flat passage member C from an air blower. Conduction heat to the heat insulating panel from the heat source part D is taken in inflow air by the inflow, and is released outside, and a surface temperature of the panel is lowered, and at the same time, a temperature drop in the heat source part 4 itself is also promoted. A temperature can be lowered in a short time, and a periodic inspection period can be shortened from the improvement of a burn preventive work environment or the like at removing work work time and shortening of inspection time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a heat supply system for a nuclear power plant, a thermal power plant, a petroleum refining and petrochemical plant, and particularly to a high-pressure turbine, a heat exchanger, a valve, and a flange that require periodic inspection. Field of the Invention The present invention relates to an improvement of a detachable box-shaped heat insulating panel suitable for use in pipes and pipes.

[0002]

2. Description of the Related Art Conventionally, as a box-type heat insulating panel of this kind,
Fill the inside of the box made of thin metal sheet with fibrous heat insulating material such as calcium silicate heat insulating material or rock wool heat insulating material, or laminate and fill with reflective foil made of aluminum or stainless steel Box-type heat insulation panels (generally called split-type heat insulation panels) are known.
And this box-shaped heat insulation panel is comprised so that a box body can be easily attached / detached with connection metal fittings, such as a buckle.

[0003]

The box-shaped heat-insulating panel having the above-mentioned structure has not only its original heat-insulating property but also the simplicity of detachability.
The entire heat insulating panel and the surface of its box are in a very high temperature state, and this state continues for a certain period of time.

[0004] In recent years, from the viewpoint of stable power supply and economics, shortening the period of the periodic inspection has been one proposition. Therefore, the box-shaped heat insulation panel having the above-described configuration that can be attached and detached in a short time tends to be frequently used.

However, the box-shaped heat insulating panel having the above-described structure has a box structure formed of a metal box, and has a characteristic that the surface temperature of the box becomes high due to heat conduction from the end face. In addition, in consideration of heat resistance and weather resistance, a stainless steel plate is often used for the box. In this case, the surface temperature of the box tends to be further increased due to the influence of the surface emissivity.

[0006] Therefore, the removal of the heat insulating panel after the operation of the plant is stopped is started after waiting for natural cooling for a certain period in consideration of the danger of burns to the operator. In addition, the heat insulation panel is forcibly removed, ignoring workability. Thereafter, since the heat source portion subjected to the periodic inspection has a large amount of heat storage, a further cooling period is required before the temperature drops to the environmental temperature at which the inspection can be performed. As described above, there is a risk in the work of removing the heat insulating panel in the early stage of the periodic inspection process, and therefore, measures to shorten the period of the periodic inspection are strongly desired.

[0007] The main object of the present invention is to provide a box-type heat-insulating panel capable of shortening the period of a periodic inspection.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a box-shaped heat insulating panel having a box body filled with a heat insulating material, wherein the box body is directed to a heat source in the box body. Is provided with a hollow flat refrigerant passage member that substantially covers most of the box face plate, and a refrigerant supply port and a discharge port of the refrigerant passage member are provided at required portions of the box body, respectively. The gist is that

According to the above configuration, for example, immediately after or immediately before the stop of the operation of the plant, air is forced to flow into the refrigerant passage member inside the box, so that heat conducted from the heat source to the heat insulating panel is taken into the inflowing air. , It is released outside the box, so the surface temperature of the insulation panel is rapidly lowered,
The temperature is reduced to a temperature lower than the burn prevention temperature, so that the work of removing from the surface portion side becomes easy, and at the same time, the temperature of the heat source portion itself is promoted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a preferred embodiment of the present invention, as shown in FIGS. 1 to 3, a fiber heat insulating material B is filled and arranged inside a box A made of a thin metal plate. In addition, a hollow flat refrigerant passage member C that covers most of the box face plate is disposed at a position close to the box face plate 1 facing the heat source portion D, and a box-shaped nozzle member C ₁ fitted to one end thereof. From the heat source, the conduction heat of the heat insulating panel is taken into the inflowing air, and is discharged out of the box body, thereby rapidly lowering the temperature of the box type heat insulating panel, and at the same time, the heat source inside itself also The temperature is lowered.

[0011]

1 to 3 show an embodiment of the present invention. 1 to 3, A is a cubic box made of a thin metal plate constituting a box-shaped heat insulating panel, and B is a rock wool heat insulating material filled and arranged inside the box. Inside the box A, a refrigerant passage member C made of a thin metal plate is disposed so as to be embedded in the heat insulating material B. The refrigerant passage member C has a hollow flat passage portion 2 formed so as to cover most of the box face plate at a portion where the box body is close to the box face plate 1 directed to the heat source portion D such as a high-pressure turbine. And a passage portion 4 which is bent in an L-shape so as to open from one end of the passage portion to the outside through the box face plate 3 on the opposite side.

The other end of the passage portion 2 is expanded in the thickness direction of the hollow, and the expanded portion 2 a communicates with the opening 6 of the box face plate 5. Wherein the expansion portion 2a, the refrigerant balloon for box-nozzle member C ₁ made of sheet metal is fitted to telescopically through the opening 6. The refrigerant balloon for box-nozzle member C ₁ is a nozzle box 7 and the front outlet
And a refrigerant supply pipe portion 8 provided at a central portion in the width direction;
It is composed of a perforated plate 9 disposed at a front portion of the tube portion 8 and a plurality of thin metal rectifying plates 10 disposed at a front portion of the perforated plate 9. On the other hand, a plurality of thin metal rectifying plates 11 are also provided in the passage portions 2 and 3 bent in an L shape.

As shown in FIG. 1, the box-shaped heat-insulating panel having the above-mentioned structure is installed and used at a position facing the heat source D. During operation of the heat source unit D, the refrigerant balloon for box-nozzle member C _1, as shown by a chain line in FIG. 3, extracted from the box A, the inlet-side expansion of the refrigerant passage portion 2 as the cavity after it is taken out thereof The inside of the open portion 2a is filled with a fiber heat insulating material. Also, the outlet of the passage portion 4 bent in an L shape is closed with a heat insulating material.

[0014] Therefore, for example, at the time of periodic inspection, if removing the insulation panels, the box fitted shape nozzle member C ₁ is taken out insulation that is filled into the passage portion 2 of the expansion portion in 2a , also remove the insulation material that closes the outlet of the passage portion 4, flowing the air into the hollow flat-shaped passage member C from the nozzle member C ₁ from the blower via a duct.

Due to the forced inflow of the refrigerant air, the heat source portion D
Since the heat transferred from the heat-insulating panel to the box-shaped heat-insulating panel is taken into the inflowing air and released to the outside of the box, the surface temperature of the box-shaped heat-insulating panel is lowered, and at the same time, the temperature of the heat source itself is promoted.

In addition, according to the use of the box-shaped nozzle member C ₁ having the above-described structure, the refrigerant air jetted from the pipe portion 8 to the nozzle box 7 is applied to the perforated plate 9 and is uniformly flowed in the width direction. After passing through the holes of the perforated plate 9, it is temporarily rectified by the rectifying plate 10 and sent to the hollow flat passage portions 2, 3, where it is flowed in a rectified state by the rectifying plate 11 disposed in the entire passage. Is released outside the box A. As a result, the flow of the refrigerant air passing through the passage portions 2 and 3 of the hollow flat passage member C is made uniform throughout the hollow flat passage portion, so that the action of taking in heat from the heat source portion is maximized. Be demonstrated.

During the operation of the heat source section D, the hollow flat passage portions 2 and 4 each having a thin metal rectifier plate therein have a function as a kind of heat insulating layer. Is more enhanced.

The position in which the hollow flat passage member C is installed in the box A is preferably set to a position as close as possible to the box face plate facing the heat source from the viewpoint of quickly dissipating the heat storage of the heat insulating material. The hollow flat passage member C is
By dividing it with a thin metal plate (rectifying plate) to form a thin sealed fluid layer, heat convection is hardly a problem. In addition, since the thin metal plate suppresses radiation, the only factor of heat transfer is air conduction and heat is transferred. There is an advantage that it is difficult.

The shape of the box-shaped heat insulating panel A can be a shape corresponding to the structure of the target heat source portion. FIG.
Is one in which the high-pressure turbine D ₁ as a heat source unit, an example in which is disposed a box-type insulating panel A ₁ formed in an L-shape to it. C is a hollow flat refrigerant passage member disposed inside the panel.

Next, the results of a cooling test performed on the box-shaped heat insulating panel according to the present invention will be described. FIG. 5 shows a schematic configuration diagram of the box-shaped heat insulating panel used in the cooling test, and FIG. 6 shows a graph of the cooling test result. Test conditions Size of box type heat insulation panel Vertical 600 mm, width 600 mm, thickness 130 mm a = 20 mm, b = 30 mm, c = 80 mm Insulation material Rock wool Average wind speed in air passage Approx. 10 m / S High temperature side 350 ° C. Atmospheric temperature 22 ° C

As shown in the graph of the above test results, in the box-type heat insulating panel according to the present invention, the outer surface temperature of the box body was reduced to the initial temperature in about 2.5 hours by flowing refrigerant air into the air passage in the box body. It was confirmed that the temperature could be lowered from 92 ° C. to the burn prevention temperature (60 ° C.). In the case of the actual machine, it takes two to three days for the heat-insulating panel having no air passage to reach the burn prevention temperature because the heat storage capacity of the engine such as the gas turbine as the heat source is large.

[0022]

As described above, according to the configuration of the box-shaped heat insulating panel of the present invention, the following effects can be obtained. (1) The temperature of the surface of the box-shaped heat insulation panel to be removed from the heat source can be lowered in a short time, and the working environment can be improved, such as preventing burns during the removal operation. (2) The inspection of the heat source unit equipment can be performed in a shorter time than after the operation of the heat source unit is stopped, which can contribute to shortening the period of the periodic inspection. (3) During operation of the heat source section, the refrigerant passage section in the box-shaped heat insulating panel can function as a heat insulating layer, so that a desired heat insulating effect can be obtained without increasing the thickness of the heat insulating panel.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a box-type heat insulating panel showing one embodiment of the present invention.

FIG. 2 is a partially cut plan view of the box-type heat insulating panel.

FIG. 3 is a partially enlarged cross-sectional view of the box-shaped heat insulating panel.

FIG. 4 is a side view showing an example of use of a box-shaped heat insulating panel.

FIG. 5 is a schematic configuration diagram of a box-shaped heat insulating panel used for a cooling test.

FIG. 6 is a graph showing a cooling test result.

[Explanation of symbols]

A, A ₁ Box B Insulating material C Refrigerant passage member D Heat source part D ₁ High pressure turbine 1, 3, 5 Box face plate 2, 4 Passage portion 2a Expanding portion 6 Opening C ₁ Box nozzle member 7 Nozzle box 8 Refrigerant Supply pipe section 9 Perforated plate 10, 11 Rectifier plate

Claims (3)

[Claims] 1. A box-shaped heat insulating panel in which a heat insulating material is filled and arranged inside a box, wherein the box is located at a position inside the box which is closer to a box face plate facing a heat source. A box, wherein a hollow flat refrigerant passage member that substantially covers most of the face plate is provided, and a refrigerant supply port and a discharge port of the refrigerant passage member are provided at required portions of the box body, respectively. Type insulation panel. 2. The box-shaped heat insulating panel according to claim 1, wherein a flow straightening plate for uniformly flowing the refrigerant through the entire passage is disposed inside the hollow flat refrigerant passage member. 3. A box-shaped nozzle member having a function of uniformly flowing and rectifying the supplied refrigerant in the width direction of the refrigerant passage member and being inserted into the refrigerant supply port of the refrigerant passage member so as to be able to be extracted freely. The box-shaped heat insulation panel according to claim 1 or 2.