JPH08110005A - Seal structure for ceiling enclosure of boiler - Google Patents

Abstract

PURPOSE: To prevent combustion ash from being discharged into a ceiling enclosure and being accumulated within the ceiling enclosure by reasonably absorbing displacement caused by thermal distortion occurring between an outer periphery of a ceiling wall and a side wall of a boiler and between the ceiling wall and a heat exchange tube passed through the ceiling wall. CONSTITUTION: High temperature fibered thermal insulation material 29 is provided above refractory material 17 disposed above a ceiling tube portion 16 which forms part of a ceiling wall 2 constituting a ceiling enclosure, and skin plates 30, 32 are disposed above the high temperature fibered thermal insulation material 29 to cover a top side of the high temperature fiber thermal insulation material 29 excepting an uncovered portion 31 of a specified width. Textile covering material 33 is arranged in connected relation with the skin plates 30, 32 to cover the uncovered portion 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure for a boiler ceiling enclosure.

[0002]

2. Description of the Related Art FIG. 10 shows an example of a boiler.
The boiler is a boiler body 6 including a furnace 3 composed of a boiler side wall 1 and a ceiling wall 2, a sub side wall 4 and a rear heat transfer section 5.
The outer periphery of the upper part of the above is surrounded by a ceiling enclosure 7, and the boiler body 6 and the ceiling enclosure 7 are suspended and supported by a suspension rod from a boiler steel frame (not shown). Reference numeral 8 is a burner provided in the furnace 3, 9 is an exhaust gas duct connected to the rear heat transfer section 5, and 7a is a ceiling lid of the ceiling enclosure.

As shown in FIGS. 6 to 8, the boiler side wall 1 and ceiling wall 2 are connected to each other by fins 10a and 11a to form a panel shape (mono wall). It was done.

A heat transfer tube 12 such as a superheater and a reheater is provided on the upper part of the furnace 3, the side wall 4 and the rear heat transfer part 5, and the heat transfer tube 12 penetrates the ceiling wall 2. And is connected to a header 13 arranged in the ceiling enclosure 7.

The steam-water mixed fluid that has flowed from the bottom to the top in the side wall pipe 10 of the boiler side wall 1 is guided to the header 14 in the ceiling enclosure 7 and then to a steam separator not shown. After steam is separated to separate steam and water, only steam is introduced into the ceiling pipe 11 of the ceiling wall 2 to be superheated.

In the side wall pipe 10 of the boiler side wall 1, 34
A gas-liquid mixed phase fluid at about 0 ° C is flowing, and the ceiling wall 2
Since superheated steam of about 380 ° C. is flowing in the ceiling pipe 11 of the above, since displacement occurs between the boiler side wall 1 and the ceiling wall 2 due to a difference in thermal expansion and contraction amount due to the temperature difference, The outer periphery of the ceiling wall 2 and the boiler side wall 1 cannot be connected to an integral rigid structure. Further, the heat transfer tube 12 penetrating the ceiling wall 2 is also displaced in the vertical direction by thermal expansion and contraction,
The ceiling wall 2 and the heat transfer tube 12 penetrating portion cannot be integrated.

For this reason, the outer peripheral portion of the ceiling wall 2 and the penetrating portion of the heat transfer tube 12 of the ceiling wall 2 absorb the displacement due to thermal expansion and contraction, and the high temperature gas and combustion ash inside the boiler body 6 are inside the ceiling enclosure 7. It has been practiced to provide a seal structure for preventing the air from blowing out.

FIGS. 6 and 7 show an example of a conventional seal structure for the outer peripheral portion of the ceiling wall 2, and as described above, the ceiling pipe 11
In the outer periphery of the ceiling monowall portion 15 formed by connecting the two with fins 11a, the ceiling loose pipe portion 16 without the fins 11a is formed up to the vicinity of the boiler side wall 1, and the outer peripheral portion of the ceiling wall 2 is deformed. A refractory material 17 is arranged on the upper side of the ceiling loose pipe portion 16 and on the inside of the boiler side wall 1 so as to close the ceiling pipes 11 from each other.

Further, the boiler side wall 1 is the ceiling wall 2
The side monowall portion 18 having the fins 10a is provided up to a position higher than the required height, and the loose pipe portion 19 having no fins is provided above the side monowall portion 18.

Side monowall portion 1 of the boiler side wall 1
Weldingly fixed one end of the skin plate 20 to the upper end of 8,
The skin plate 20 is arranged along the refractory material 17, and the other end thereof is fixed by welding to a seal receiving plate 21 which is erected on the outer peripheral end of the ceiling monowall portion 15 by welding.

FIGS. 6 and 8 show an example of a conventional seal structure for the penetration portion of the heat transfer tube 12 of the ceiling wall 2, in which the fin 11a is provided in the penetration portion of the heat transfer tube 12 of the ceiling monowall portion 15.
In addition to providing a ceiling loose pipe portion 22 not having the above to enhance the deformability of the outer peripheral portion, by bending the ceiling pipe 11 of the ceiling loose pipe portion 22, an opening 23 is formed to penetrate the heat transfer tube 12 and Arrange the refractory material 17 around the heat transfer tube 12,
Between the angle-shaped support member 25 fixed to the seal plate 24 that closes the heat transfer tubes 12 and the seal receiving plate 26 weld-fixed to the ceiling monowall portion 15, the refractory material 17 is provided. The skin plate 27 that covers the above is welded.

Therefore, in the above method, the skin plate 2 made of a relatively thin material so that it can be easily deformed.
By the complete seal welding of 0 and 27, the absorption and the displacement of the ceiling wall 2 and the boiler side wall 1 and the displacement due to the thermal expansion and contraction between the ceiling wall 2 and the heat transfer tube 12 penetrating the ceiling wall 2 are performed. are doing.

As another example of the conventional seal structure, a seal is attached between the outer periphery of the ceiling monowall portion 15 shown in FIG. 7 and the side monowall portion 18 above the boiler side wall 1 by welding. The case of applying the present invention to the skin plate 20 is shown in FIG. 9. As shown in FIG. 9, the skin plate 20 a fixed to the side monowall portion 18 and the seal receiving plate 21 fixed to the ceiling monowall portion 15 are welded to each other. The skin plate 20b that is attached by means of (1) is wrapped (overlapped) with a required width, and the sliding of the wrap portion 28 of the skin plate 20a, 20b absorbs the displacement of the boiler side wall 1 and the ceiling wall 2 due to thermal expansion and contraction. I try to seal it.

[0014]

However, as shown in FIGS. 6 to 8, in the method in which the skin plates 20 and 27 are completely sealed and welded to perform the sealing, the temperature change of the boiler is caused. When the expansion and contraction of the ceiling wall 2 and expansion and contraction of the heat transfer tube 12 occur due to the above, the skin plates 20 and 27 cannot completely absorb this displacement, and unreasonable force is concentrated especially on the corners of the skin plates 20 and 27.
There is a problem of deformation or damage due to cracks, etc. If the skin plates 20, 27 are deformed, it is necessary to repair or remodel, and if cracks occur, a fireproof material No. 17 originally has cracks and gaps and does not have sealing properties.
There was a problem that the high temperature gas and the combustion ash in the inside blow out into the ceiling enclosure 7 and the combustion ash accumulates in the ceiling enclosure 7. Therefore, in the above-mentioned conventional method, it is necessary to repair and improve the deformed portions and the cracked portions of the skin plates 20 and 27 at every regular inspection of the boiler, and when combustion ash is accumulated in the ceiling enclosure 7. However, there is a problem in that the work of removing the combustion ash is required, and that the above work requires a great deal of labor and time.

Further, as shown in FIG. 9, in the system in which the divided skin plates 20a and 20b are wrapped to absorb the displacement due to thermal expansion and contraction by the sliding of the wrap portion 28 and to seal. Since there is a gap in the wrap portion 28, there is a problem that high temperature gas and combustion ash are blown out from the gap and combustion ash is accumulated in the ceiling enclosure 7. For this reason, combustion ash accumulated in the ceiling enclosure 7 is caused. There is a problem in that the work of removing the is very time-consuming and time-consuming.

The present invention has been made in view of the above circumstances, and displacement due to thermal expansion and contraction occurs between the outer periphery of the ceiling wall and the side wall of the boiler, and between the ceiling wall and the heat transfer tube penetrating the ceiling wall. However, it is possible to absorb the displacement without difficulty,
Moreover, it is an object of the present invention to provide a seal structure for a boiler ceiling enclosure in which combustion ash in the furnace does not blow out into the ceiling enclosure and accumulate on the ceiling enclosure.

[0017]

According to the present invention, a high temperature fibrous heat insulating material is provided on the upper side of a refractory material provided on an upper portion of a ceiling bulk pipe forming a part of a ceiling wall in a ceiling enclosure. ,
Further, a skin plate is arranged on the upper side of the high temperature fiber heat insulating material so as to cover the upper side while leaving an uncovered portion of a required width, and the skin coating is formed on the skin plate so as to cover the uncovered portion. The present invention relates to a seal structure for a boiler ceiling enclosure, in which materials are connected and arranged.

[0018]

According to the present invention, the high temperature fibrous heat insulating material is disposed on the upper side of the refractory material arranged on the upper side of the loose ceiling pipe formed on the ceiling wall of the ceiling enclosure. Since the upper side of is covered with a skin plate leaving a required uncovered portion, and a textile coating material that covers the uncovered portion is connected to the skin plate, a space between the ceiling wall and the boiler side wall is formed. Displacement due to thermal expansion and contraction and displacement due to thermal expansion and contraction of the heat transfer tube penetrating the ceiling wall can be absorbed completely by deformation of the textile coating material, and furthermore, high-temperature fiber material provided on the upper side of the refractory material. The filter effect of the heat insulating material and the textile coating material can prevent the combustion ash in the boiler body from being blown out and accumulated in the ceiling enclosure.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

First, an embodiment in which the seal structure of the present invention is applied to the outer peripheral portion of the ceiling wall will be described with reference to FIGS. In the drawings of the related art and the present invention, the same reference numerals represent the same items.

As shown in FIG. 2, which is a view taken along the line II-II in FIG. 1, a ceiling bulk tube having no fins 11a on the outer circumference of the ceiling monowall portion 15 of the ceiling wall 2 constituting the ceiling enclosure 7. By extending the portion 16 up to the vicinity of the boiler side wall 1, the deformability of the outer peripheral portion of the ceiling wall 2 is enhanced, and further on the upper side of the ceiling loose pipe portion 16 and the inside of the side monowall portion 18 of the boiler side wall 1. The refractory material 17 is arranged so as to close the ceiling pipes 11 from each other.

Further, a fibrous heat insulating material 29 for high temperature is provided on the upper side of the refractory material 17 in a required thickness. The high temperature fibrous heat insulating material 29 has heat resistance like rock wool,
Moreover, it is compacted so as to maintain appropriate airtightness.

One end of a skin plate 30 is welded and fixed to the upper end of the side monowall portion 18 of the boiler side wall 1, and the skin plate 30 is disposed so as to cover the high temperature fiber heat insulating material 29. The end is the ceiling monowall portion 15
Seal receiving plate 2 that is started and fixed to the outer peripheral edge by welding
1 is extended to a position where an uncovered portion 31 having an appropriate width is formed. A narrow skin plate 32 having a small width and extending toward the non-covered portion 31 is fixed to the seal receiving plate 21 by welding.

Between the other end of the skin plate 30 and the narrow skin plate 32, a textile coating material 33 is arranged so as to cover the uncoated portion 31. Textile covering material 33
As shown in FIG. 3, it has a mat shape in which rock wool 34 is used as batting and the outer periphery is surrounded by a textile product 35 such as cloth, and a stop hole is formed in the peripheral portion in advance. It is adapted to be fixed to the other end of 30 and the narrow skin plate 32 via a holding plate 36 and a fixing bolt 37 inserted in the stop hole.

FIG. 4 shows a sealing structure provided on the outer peripheral portion of the ceiling wall at a position different from that in FIG. 2 by 90 degrees (IV-IV in FIG. 1).
Direction). In the case of FIG. 4 above, the ceiling wall 2
Since the ceiling pipe 11 of the above is parallel to the boiler side wall 1, the deformability of the ceiling loose pipe part 16 ′ provided on the outer periphery of the ceiling monowall part 15 of the ceiling wall 2 is large, and therefore the 2 in which the ceiling pipe 11 is provided in a right-angled direction as shown in FIG. 2, only the widths of the ceiling loose pipe portion 16 'and the skin plate 30' are different, and other The configuration is almost the same as in the case of FIG.

FIG. 5 shows an example of a seal structure applied to the penetration portion of the heat transfer tube 12 in the ceiling wall 2. The fin 1 is provided in the penetration portion of the heat transfer tube 12 of the ceiling monowall portion 15.
The ceiling loose pipe portion 22 having no 1a is provided to enhance the deformability of the portion, and the ceiling pipe 11 of the ceiling loose pipe portion 22 is bent to form the opening 23 so that the heat transfer tube 12 is penetrated and the opening 23 is formed. Place the refractory material 17 around the heat transfer tube 12 of
On the upper side of the refractory material 17, the same high-temperature fibrous heat insulating material 29 as described above is arranged with a required thickness. Further, the heat transfer tube 12
The narrow skin plates 38 and 39 are attached to the angle-shaped support member 25 fixed to the seal plate 24 so as to close each other and the seal receiving plate 26 welded and fixed to the ceiling monowall portion 15. To form the uncovered portion 40,
A textile coating material 33, which covers the high temperature fiber heat insulating material 29, is connected between the narrow skin plates 38 and 39 by a fixing bolt 37 via a pressing plate 36.

Next, the operation of the above embodiment will be described.

As described above, the heat transfer tube 12 penetrates the loose ceiling pipe portion 16 formed on the outer periphery of the ceiling monowall portion 15 of the ceiling wall 2 of the ceiling enclosure 7 and the ceiling monowall portion 15 of the ceiling wall 2. Ceiling loose pipe part 2 formed in part
The heat insulating material 29 for high temperature is arranged on the upper side of the refractory material arranged on the upper side of 2, and the non-covered parts 31, 40 are formed on the upper side of the heat insulating material 29 for high temperature to form the skin. The skin plate 3 covered with plates 30, 32 and 38, 39
0, 32 and 38, 39 in the non-coated portion 31, 40,
Textile covering material 33 adapted to cover the uncovered portions 31, 40
Is arranged so as to be connected to the skin plates 30, 32 and 38, 39, the displacement due to thermal expansion and contraction between the ceiling wall 2 and the boiler side wall 1 and the heat transfer tube penetrating the ceiling wall 2 Displacement due to thermal expansion and contraction of 12
By the deformation of No. 3, it can be absorbed without any difficulty, and furthermore, the fibrous heat insulating material for high temperature 29 provided on the upper side of the refractory material 29.
Also, due to the filter effect of the textile coating material 33, it is possible to prevent the combustion ash in the boiler body 6 from being blown out and accumulated in the ceiling enclosure.

[0029]

According to the present invention, the high temperature fibrous heat insulating material is disposed on the upper side of the refractory material arranged on the upper side of the ceiling loose pipe portion, and the upper side of the high temperature fibrous heat insulating material is required. The non-covered part is formed and covered with the skin plate, and the textile coating material covering the non-covered part is arranged on the non-covered part by the skin plate. The deformation due to the heat expansion and contraction of the heat transfer tube that penetrates the ceiling wall and the heat expansion and contraction of the heat transfer tube that penetrates the ceiling wall can be absorbed without difficulty by the deformation of the textile coating material. By the filter effect of the fiber heat insulating material and the textile coating material, it is possible to prevent the combustion ash in the boiler body from being blown out and accumulated in the ceiling enclosure.
And so on.

[Brief description of drawings]

FIG. 1 is a partial schematic plan view of a ceiling wall showing an embodiment of the present invention.

FIG. 2 is an enlarged arrow view taken along line II-II in FIG.

FIG. 3 is a partially enlarged detailed view of FIG. 2;

FIG. 4 is an enlarged arrow view in the IV-IV direction of FIG.

5 is a magnified view in the direction VV of FIG.

FIG. 6 shows an example of a ceiling wall that constitutes a conventional ceiling enclosure, and is a partial schematic plan view of FIG. 10 seen from the VI direction.

FIG. 7 is an enlarged arrow view in the VII-VII direction of FIG.

FIG. 8 is an enlarged view in the direction of arrows VIII-VIII in FIG.

9 is an enlarged arrow view seen from the same direction as FIG. 7 showing another example of the conventional seal structure.

FIG. 10 is a side view showing an example of a boiler.

[Explanation of symbols]

 2 Ceiling wall 7 Ceiling enclosure 16 Ceiling loose pipe part 16 'Ceiling loose pipe part 17 Refractory material 22 Ceiling loose pipe part 29 High temperature fibrous heat insulating material 30 Skin plate 30' Skin plate 31 Non-covered part 32 Narrow skin plate 33 Textile woven material 38 Narrow skin plate 39 Narrow skin plate 40 Uncoated part

Claims (1)

[Claims] 1. A high temperature fibrous heat insulating material is disposed on an upper side of a refractory material provided on an upper side of a ceiling bulk pipe part forming a part of a ceiling wall in a ceiling enclosure, and the high temperature fibrous heat insulating material is provided. A skin plate is arranged on the upper side of the material so as to cover the upper side while leaving an uncovered portion of a required width, and on the skin plate,
A seal structure for a boiler ceiling enclosure, in which a textile coating material is arranged so as to cover the non-coated portion.