JP3504869B2 - Composite insulation panel for paper machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite heat insulating panel for a paper machine, which constitutes a hood of a paper machine dryer part for collecting water vapor generated from a wet paper and discharging it to the outside.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional paper machine dryer part 1
FIG. 8 is a side view, and FIG. 8 is a cross-sectional view of the dry part 1 at right angles to the paper flow direction. In the conventional paper machine dryer part 1, the wet paper 10 carried in from the former part is carried out to the latter part while being brought into contact with the surfaces of several tens of cylinder dryers 3 in sequence. Since the cylinder dryer 3 normally passes high-pressure steam inside, the wet paper 10 in contact therewith is heated, and its water content becomes water vapor and is discharged to the surroundings.

When the released steam stays in the vicinity of the cylinder dryer 3, evaporation of steam from the wet paper is hindered. Therefore, the steam is evaporated and the temperature and humidity inside the hood 2 are adjusted. 4, hot air heated by a heater (not shown) is supplied. Thus, the cylinder dryer 3
For the purpose of efficiently collecting the steam released upward from the vicinity of the room and discharging it to the outside of the room, and suppressing the heat radiation from the heated high temperature cylinder dryer 3, the dryer part 1
The left, right, front and back and the upper five sides are covered with a heat insulating panel 11 called a hood.

Above the hood 2, there is a double ceiling usually called a plenum sheet 5, and the wet paper 10 described above is used.
The high-temperature air containing water vapor evaporated from the plenum sheet 5 is collected on the ceiling through a damper and a slit provided in the plenum sheet 5, and is exhausted to the outside by an exhaust blower 6. Since these walls have a heat insulating property, they are mainly composed of the heat insulating panel 11 shown in FIGS. 9 and 10, and are composed of the frame component member 15 and the surface layer plates 13 and 14 which prevent direct contact with moisture in the air. A plurality of heat insulating panels are assembled adjacent to each other.

[0005]

When the surface temperature of the inner wall of the heat insulation panel becomes lower than the dew point in the hood, dew condensation occurs on that portion. FIG. 9 shows a conventional thermal insulation panel 11, and FIG. 10 shows its cross section. The heat transfer route A shown in FIG.
Although the effect of 2 is exerted as it is, in route B, since the heat conductive frame component member 15 directly connects the front and back of the panel,
The heat insulating material 12 has almost no effect. Therefore, in the conventional type panel, since the temperature of the inner surface of the hood 2 around the heat insulating panel 11 (rim) is low, it is required to operate the dew point of the atmosphere in the hood at a low value in order to prevent dew condensation. On the other hand, as shown in FIGS. 11A to 11C, setting the dew point in the hood to a low level means increasing the amount of air discharged from the hood, increasing the capacity of the exhaust blower 6 and the heater, and increasing the running cost. Leading to an increase in

For the surface layers 13 and 14 of the heat insulating panel 11, aluminum plates having a thickness of about 1 mm and having heat conductivity are often used for weight reduction and cost reduction. This surface plate 13, 14
A material having low rigidity such as glass wool or rock wool is usually used for the heat insulating material 12 covered by, and its compressive strength is extremely weak. Therefore, the heat insulation panel 11 is attached to the hood 2.
Even when a slight twisting force or bending force is applied when it is installed as an outer wall of wrinkles, wrinkles are generated in the surface layer plates 13 and 14 and the product value is aesthetically deteriorated, and when used as a roof panel, It is not strong enough for people to walk on.

FIG. 12 shows an example of a countermeasure against the above problem. A portion corresponding to the frame component member 15 of FIG. 10 is configured by a metal frame component member 16 and a resin frame component member 17 having high heat insulation performance. (JP-A-2-264095) In addition, FIG. 13 shows a metal frame constituent member 18, 1 for the same purpose.
This is an example in which a resin frame constituent member 20 having high heat insulation performance is embedded between 9 pieces. (Actual Kaihei 4-50795) The heat insulating panel 11 shown in FIGS. 12 and 13 improves heat insulating properties, but as a common problem, the rigidity of the panel is reduced by using a thin resin and the cost is increased due to a complicated structure. is there. The present invention has been made in view of the above problems, and provides a composite heat insulating panel for a paper machine, which can improve the heat insulating effect of the heat insulating panel of the dryer hood for a paper machine and can increase the rigidity. The purpose is to do.

[0008]

In order to achieve the above object, the composite heat insulation panel for a paper machine of the present invention is used for a hood of a dryer part for heating and drying a paper sheet, and a pair of inner and outer hoods are provided. A papermaking machine in which surface layer plates are arranged at intervals, a heat insulating material is provided between the surface layer plates to block heat in the hood from the outside, and a frame member for skeleton is provided on the outer peripheral portion of the heat insulating material. In a composite heat insulating panel for machine, an auxiliary heat insulating plate is disposed between the heat insulating material and the frame material and the outer surface plate of the pair of surface layer plates, and the frame material and the one
Do not make direct contact with the outer surface plate of the pair of surface plates
I did .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a heat insulating panel of a dryer hood for a paper machine according to the present invention will be described below with reference to the drawings. The same components as those in the conventional example will be described with the same reference numerals, and the dryer part 1 will be described with reference to FIGS.

FIG. 7 shows a side view of the conventional paper machine dryer part 1, and FIG. 8 shows a cross-sectional view of the dry part 1 at right angles to the paper flow direction. The dryer part 1 is provided with a hood 2, and the left, right, front, rear, and top walls of the hood 2 are formed by heat insulating panels 11. Inside the hood 2, a large number of cylinder dryers 3 configured to allow high-pressure steam to flow inside are provided side by side.
An air supply nozzle 4 that blows up the gas around the cylinder dryer 3 to the upper part is installed in the lower part of the. In the upper part of the hood 2, a plenum sheet 5 having a damper and a slit (not shown) to allow gas to flow is arranged along the ceiling wall. An exhaust blower 6 that discharges the gas between the plenum seat 5 and the ceiling wall to the outside is connected to the hood 2. The enclosing portion of the hood 2 is provided with a fixed wall 7 and movable walls such as a lifting panel 8 and a sliding door 9. The dryer part 1 according to the present embodiment is configured as described above, and its operation is as described in the above-mentioned conventional example. In this embodiment, only the structure of the heat insulation panel 11 of the hood 2 is improved. Therefore, only the heat insulating panel will be described in detail.

FIG. 1 shows an insulation panel 11 for a hood,
FIG. 2 is a sectional view of one end thereof. As shown in the figure, the heat insulating panel 11 is a low-rigidity heat insulating material 1 such as glass wool.
2, the same as the conventional heat insulation panel shown in FIGS. 9 and 10 until the surface layers 13 and 14 for protecting it from the inside and outside and the frame component 15 of the frame frame strength member of the panel are arranged.
The auxiliary heat insulating plate 21 made of calcium silicate, which is a highly rigid heat insulating material, is inserted inside the surface layer 13, which is different from the conventional case. That is, the frame constituent member 15 and the heat insulating material 12
Since the auxiliary heat insulating plate 21 is disposed between the outer surface layer 13 and the surface layer plate 13, the frame component 15 is in contact with the inner surface layer plate 14, but is not in direct contact with the outer surface layer plate 13. Absent. Incidentally. In this embodiment, the heat insulating material 12 has a thickness of 75.
mm, and the thickness of the auxiliary heat insulating plate 21 is 10 mm.

Heat transfer when the heat insulating panel 11 according to the present embodiment is used for a hood is performed from the surface layer plate 14 to the frame component member 15.
Since the route for transmitting the electric field passes through the auxiliary heat insulating plate 21, there is no longer the phenomenon of passing through only the frame component 15 as in the route B of FIG. The effect of the auxiliary heat insulating plate 21 is analyzed by heat transfer calculation, as shown in FIG. In the same calculation, the temperature conditions inside and outside the hood are set to be the same. As shown in FIG. 3, the central portion of the panel corresponding to route A (see FIG. 10, the thickness of the heat insulating material in FIG. 10 is 100 mm) is as effective as thickening the heat insulating material 12, It can be seen that the panel frame portion corresponding to B has significantly improved heat insulation performance as compared with the conventional product.

On the other hand, the improvement of the heat insulating performance brings the following merits. (1) Reduction of exhaust fan capacity The amount of water evaporated from the wet paper in the dryer part is constant. The humidity of the air in the hood increases by the amount of the evaporated water. When the amount of exhaust air from the hood is large, the percentage of evaporated water is small, so the water content is low. That is, since the dew point of the air in the hood is low, there is no problem even with a conventional type panel having a low heat insulating performance. On the other hand, when the amount of exhaust air from the hood is small, the proportion of evaporated water is large and the water content is high. That is, since the dew point of the air in the hood is high, unless the heat insulation performance of the panel is high, the temperature of the inner wall of the panel drops below the dew point to cause dew condensation. When the heat insulation panel according to the present invention is used for the hood, the temperature of the inner wall of the panel can be maintained at a high level over the entire surface due to its high heat insulation performance, so that the exhaust air volume is suppressed to the minimum, and as a result, as shown in FIG.
As shown in 1 to AC, there is an advantage that it can contribute to energy saving and running cost reduction.

(2) Improvement of aesthetics By inserting the auxiliary heat insulating plate 21 having high rigidity, the torsional rigidity and compression rigidity of the heat insulating panel are increased, and the wrinkling phenomenon at the time of installation and installation can be greatly reduced. (3) Simple structure with no decrease in strength and minimal increase in cost In FIG. 2, an auxiliary heat insulating plate 2 which is a calcium silicate plate
Other than 1 is the same as the conventional type, and since the structure of the frame member which is the strength member is not changed as shown in FIGS. 12 and 13, there is no reduction in the strength of the panel. Further, since the commercially available calcium silicate plate is used as it is, the cost is increased only by the material cost, which can be said to be extremely small compared with the cost increase due to the structural change as shown in FIGS. 12 and 13. Also,
An extremely simple shape can be formed without performing special processing on the high-rigidity auxiliary heat insulating plate or the frame component member.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 shows the heat insulating panel 11 according to the present embodiment. The difference from the heat insulating panel of FIG. 1 is that the auxiliary heat insulating plate 23 made of calcium silicate is provided in a narrow range only in the frame portion of the heat insulating panel 11 and the crosspiece 22. It was just for that. Even with this configuration,
Since the cage segments 15 and the surface layer plate 13 are superimposed via the auxiliary heat insulating plate 23, similarly to the above embodiment heat insulating effect is large, in this embodiment, it can be substantial savings in calcium silicate plate is there.

For the following two reasons, it is possible to use the heat insulation panel of the present embodiment and the heat insulation panel of the first embodiment in combination depending on the place to use and the usage. . (1) Since the heat insulation panel used for the roof part requires strength because a person walks on it, it is better to put calcium silicate plate on the entire surface because the strength is high and the number of bars 22 inserted in the middle is also minimum. You can save as much as you can. On the other hand, when the heat insulating panel is used for the vertical wall, the strength is not necessary because a person does not walk. That is, like the heat insulating panel of the present embodiment,
There is no problem even if the surface layer plate 13 is directly laminated on the heat insulating material 12 which is glass wool. (2) In the case of a roof, a dedicated corridor may be installed separately. In that case, since a person does not walk directly on the heat insulating panel, the surface layer plate 13 is directly placed on the heat insulating material 12 like the vertical wall.
It is no problem to use a stack of.

Next, a third embodiment of the present invention will be described with reference to the drawings. 5 shows an example in which a small hole 26 is formed in the auxiliary heat insulating plate 24 of the calcium silicate plate, and FIG. 6 shows the auxiliary heat insulating plate 2 of the calcium silicate plate in the same manner.
This is an example in which, when the 5 is stretched, it is not closely attached, but a gap is intentionally provided for mounting. When attaching the hood surface layer plate 14 of the panel, as a measure against leakage (leakage of moist air into the panel), the frame component 15 and the surface layer plate 14 are caulked with silicon or the like. .

Therefore, there should be no leakage phenomenon for a few years immediately after the installation operation, but after a long period of operation, there is a potential danger of leakage due to deterioration of the caulking agent or the like. At this time, if the calcium silicate plate is attached in close contact, there is no escape area for the leaking moist air, and the glass wool stays inside and humidifies the glass wool. When the glass wool is humidified, the fibers come into close contact with each other to form a so-called dumpling state, so that it becomes impossible to maintain a predetermined heat insulating space. The present embodiment is intended to extend the life of the panel by providing an escape path for the leaking moist air (a small hole or a clearance between adjacent plates is an escape path).

Although the respective embodiments of the present invention have been described above, it is needless to say that the present invention is not limited to these and various modifications and changes can be made based on the technical idea of the present invention.

[0020]

EFFECTS OF THE INVENTION The composite heat insulation panel for a paper machine of the present invention is
It is used for a hood of a dryer part that heats and dries paper sheets, and a pair of surface layer plates are arranged at intervals inside and outside of the hood, and between these surface layer plates, heat insulation that blocks heat inside the hood from the outside In a composite heat insulating panel for a paper machine, in which a frame member for frame is provided on the outer peripheral portion of the heat insulating material, the heat insulating material and the frame material and the pair of surface layer plates are provided.
An auxiliary heat insulating plate is arranged between the outer surface layer plate and the above frame material.
And the outer surface plate of the pair of surface plates are not in direct contact with each other.
Since it is possible to keep the temperature of the insulation panel surface on the inner wall of the hood at a high level over the entire surface with high insulation performance, it is possible to suppress the exhaust air volume to the minimum and contribute to energy saving and running cost reduction. There is.

[Brief description of drawings]

FIG. 1 is a perspective view of a heat insulation panel of a dryer hood for a paper machine according to a first embodiment of the present invention.

2 is a cross-sectional view of one end of the heat insulation panel of FIG.

3 is a perspective view of the heat insulation panel showing a panel surface temperature inside the hood of the heat insulation panel of FIG. 1. FIG.

FIG. 4 is a perspective view of a heat insulation panel of a dryer hood for a paper machine according to a second embodiment of the present invention.

FIG. 5 is a perspective view of a heat insulation panel of a dryer hood for a paper machine according to a third embodiment of the present invention.

FIG. 6 is a perspective view of a heat insulating panel of a dryer hood for a paper machine according to a modified example of the third embodiment of the present invention.

FIG. 7 is a sectional view of a conventional dryer part in a wet paper web flow direction.

FIG. 8 is a sectional view of a conventional dryer part in a direction perpendicular to the flow of wet paper.

FIG. 9 is a perspective view of a conventional heat insulation panel showing a panel surface temperature inside a hood.

10 is a cross-sectional view of one end of the heat insulation panel of FIG.

11A is a diagram showing the relationship between the exhaust air amount of the blower and the hood exhaust dew point, and FIG. 11B is a diagram showing the relationship between the horsepower of the blower and the hood exhaust dew point; C
FIG. 4 is a cross-sectional view showing the relationship between steam consumption and hood exhaust dew point.

FIG. 12 is a cross-sectional view showing one end of another conventional heat insulating panel.

FIG. 13 is a cross-sectional view showing one end of another conventional heat insulating panel.

[Explanation of symbols]

1 Dryer part 2 hood 3 cylinder dryer 4 Air supply nozzle 5 Plenum sheet 6 exhaust blower 7 fixed wall 8 Lifting nozzle 9 sliding doors 10 Wet paper 11 Insulation panel 12 Insulation 13,14 Surface plate 15 Frame components 16, 18, 19 Metal frame components 17,20 Resin frame component 21,23,24,25 Auxiliary heat insulating plate 26 small holes

Continuation of the front page (56) Reference JP-A-57-81547 (JP, A) JP-A-1-264948 (JP, A) Actual opening 60-132499 (JP, U) Actual opening Sho-55-154207 (JP , U) Actually developed 53-151609 (JP, U) Actually developed 57-187310 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) D21F 1/00-13/12 E04B 1/62-1/99

Claims (5)

(57) [Claims] 1. A hood for a dryer part for heating and drying a paper sheet, wherein a pair of surface layer plates are provided at an inner side and an outer side of the hood with a space therebetween, and the heat in the hood is placed between these surface layer plates. In addition to providing a heat insulating material that shuts off from the outside,
A composite heat insulating panel for a paper machine, wherein a frame material for frame is provided on an outer peripheral portion of the heat insulating material, the heat insulating material, the frame material and the
Between the outer surface layer plate of the pair of surface layer plates , an auxiliary heat insulating plate is disposed, and the frame material and the outer surface layer plate of the pair of surface layer plates are
A composite heat insulation panel for paper machines, characterized by not being in direct contact with it. 2. The composite heat insulating panel for a paper machine according to claim 1, wherein the auxiliary heat insulating plate has rigidity higher than that of the heat insulating material and has fire resistance. 3. The composite heat insulating panel for a paper machine according to claim 2, wherein a calcium silicate plate is used as the auxiliary heat insulating plate. 4. A reinforcing bar is installed on the frame member, and the auxiliary heat insulating plate is provided only in a portion where the frame member and the bar are located. A composite heat insulating panel for a paper machine according to any one of the above. 5. The heat insulating material is made of glass wool, and the auxiliary heat insulating plate is provided with a space portion through which gas from the glass wool can be discharged. A composite heat insulating panel for a paper machine according to any one of the above.