WO2022185940A1 - シールボックス - Google Patents
シールボックス Download PDFInfo
- Publication number
- WO2022185940A1 WO2022185940A1 PCT/JP2022/006389 JP2022006389W WO2022185940A1 WO 2022185940 A1 WO2022185940 A1 WO 2022185940A1 JP 2022006389 W JP2022006389 W JP 2022006389W WO 2022185940 A1 WO2022185940 A1 WO 2022185940A1
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- WO
- WIPO (PCT)
- Prior art keywords
- wall
- seal box
- peripheral
- peripheral wall
- ceiling wall
- Prior art date
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 35
- 230000008646 thermal stress Effects 0.000 claims abstract description 16
- 238000003466 welding Methods 0.000 claims abstract description 13
- 230000000149 penetrating effect Effects 0.000 claims abstract description 8
- 239000004744 fabric Substances 0.000 description 24
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000000567 combustion gas Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000012210 heat-resistant fiber Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/36—Arrangements for sheathing or casing boilers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/40—Arrangements of partition walls in flues of steam boilers, e.g. built-up from baffles
Definitions
- the present invention relates to a seal box that covers the gap between the boiler ceiling wall and the heat transfer tube group penetrating the boiler ceiling wall to prevent combustion ash and the like from entering the penthouse.
- a large number of heat transfer tube groups that constitute a heat exchanger such as a superheater are suspended in the boiler furnace. ) is connected.
- Each header is connected to a manifold installed in the penthouse of the boiler building, and the fluid flowing through the heat transfer tube group is collected in the manifold via the header.
- Combustion ash generated in the furnace enters the penthouse through the gaps between the boiler ceiling wall and the heat transfer tubes penetrating the boiler ceiling wall.
- This type of seal box is formed in a box shape to cover a large number of heat transfer tube groups, the lower end of the peripheral wall of the seal box is fixed to the boiler ceiling wall by welding, and the ceiling wall of the seal box is fixed to the header by welding. ing. Since there is a considerable temperature difference between the ceiling wall of the boiler and the manifold, thermal stress acts on the seal box in the vertical direction due to the difference in thermal elongation between the two. In order to absorb this thermal stress, the seal box is provided with, for example, a W-shaped expansion (see Patent Document 1).
- the present invention has been made in view of the above-described actual situation, and its object is to provide a seal box that can absorb greater thermal stress.
- one aspect of the present invention is a seal box provided in a penthouse that is a space above a boiler ceiling wall and surrounding a group of heat transfer tubes penetrating the boiler ceiling wall, wherein the seal
- the box is formed in a box shape having a peripheral wall consisting of a front wall, a rear wall, a left wall, and a right wall, and a ceiling wall covering the peripheral wall from above, and the heat transfer tube group is connected to the ceiling wall.
- the lower end of the peripheral wall is fixed to the boiler ceiling wall by welding, and the peripheral wall has a continuous vertical slit extending through the front wall, the ceiling wall, and the rear wall. It is characterized by being provided.
- another aspect of the present invention is a seal box provided in a penthouse, which is a space above a boiler ceiling wall, surrounding a group of heat transfer tubes penetrating the boiler ceiling wall, , the seal box is formed in a box shape having a peripheral wall composed of a front wall, a rear wall, a left side wall and a right side wall, and a ceiling wall covering the peripheral wall from above, and the ceiling wall is formed by the heat transfer tube
- the lower end of the peripheral wall is fixed to the boiler ceiling wall by welding, and at least the front wall and the rear wall of the peripheral walls are provided for absorbing thermal stress.
- the expansion has a U-shaped cross section and protrudes outward from the peripheral wall.
- FIG. 1 is an external perspective view of a seal box according to a first embodiment
- FIG. FIG. 4 is an external perspective view of a state in which the slit of the seal box is covered with a heat-resistant cloth
- FIG. 4 is a vertical cross-sectional view of the seal box shown in FIG. 3 cut along a virtual plane P and viewed from direction A
- 4 is a cross-sectional view showing a state in which the heat-resistant cloth is attached to the ceiling wall, and is a cross-sectional view taken along the BB direction of FIG. 3.
- FIG. 4 is a cross-sectional view showing a state in which the heat-resistant cloth is attached to the front wall, and is a cross-sectional view taken along the CC direction of FIG. 3;
- FIG. 9 is an external perspective view of a seal box according to a second embodiment;
- FIG. 1 is a side view showing the overall structure of the boiler.
- a seal box according to the present invention is applied to, for example, a boiler 1 shown in FIG.
- front-rear, up-down, and left-right directions are defined as shown in each drawing.
- the boiler 1 shown in FIG. 1 is installed, for example, in power generation equipment.
- a boiler 1 includes a furnace 2 for burning fuel such as pulverized coal, a cage portion 3 , and a sub-side wall 4 connecting the furnace 2 and the cage portion 3 .
- Combustion gas generated in the furnace 2 flows through the sub-side wall 4 and the cage portion 3, which are flow paths for the combustion gas, and then is discharged to the atmosphere through a gas treatment device (not shown).
- the furnace 2 includes a furnace side wall 5 and a furnace ceiling wall (boiler ceiling wall) 6, and is suspended from a steel frame 10 by hanging bolts 11.
- the furnace side wall 5 and the furnace ceiling wall 6 are formed in a wall shape by alternately welding heat transfer tubes and fin bars (not shown), and are configured so that water flows inside each heat transfer tube.
- a plurality of heat exchangers consisting of a large number of heat transfer tubes (heat transfer tube group) 15 are installed inside the furnace 2 , the sub-side wall 4 , and the cage portion 3 .
- These heat exchangers include, for example, superheaters, reheaters, economizers, and the like.
- the high-temperature combustion gas exchanges heat with the fluid in the heat transfer tube group 15 while flowing through the furnace 2 , the sub-side wall 4 , and the cage portion 3 . This produces hot superheated steam.
- a penthouse (ceiling room) 13 is provided above the furnace ceiling wall 6 (the space between the furnace ceiling wall 6 and the steel frame 10).
- a header 16 and a manifold 17 are suspended from the penthouse 13 by suspension bolts 12 .
- the heat transfer tube group 15 is connected to a header 16 and suspended in the furnace 2 through a heat transfer tube penetration portion 7 (see FIG. 4) opened in the furnace ceiling wall 6 .
- a seal is provided inside the penthouse 13 so as to surround the heat transfer tube group 15.
- a box 20 is provided. The structure of the seal box 20 according to the first embodiment of the present invention will be described below.
- FIG. 2 is an external perspective view of the seal box 20 according to the first embodiment
- FIG. 3 is an external perspective view of the state in which the slit of the seal box 20 is covered with a heat-resistant cloth
- FIG. It is the longitudinal cross-sectional view which cut
- the seal box 20 has a peripheral wall 25 consisting of a front wall 21, a rear wall 22, a left wall 23 and a right wall 24, and a ceiling wall 26 covering the peripheral wall 25 from above. It is shaped like a box.
- the ceiling wall 26 is fixed to the header 16 by welding, and the lower end of the peripheral wall 25 is fixed to the furnace ceiling wall 6 by welding. As a result, the space R (see FIG. 4) between the furnace ceiling wall 6 and the header 16 is sealed by the seal box 20 .
- the seal box 20 is provided with a vertical slit 28 and a plurality of horizontal slits 29 (29a, 29b).
- the vertical slit 28 is continuously provided with a predetermined width across the front wall 21 , the ceiling wall 26 and the rear wall 22 . Both ends of the vertical slit 28 extend to slightly higher positions than the lower ends of the front wall 21 and the rear wall 22 (see FIG. 6).
- one vertical slit 28 is provided substantially in the center in the longitudinal direction (horizontal direction in FIG. 2), but the number is not limited to one. That is, a plurality of vertical slits 28 may be provided at intervals in the longitudinal direction.
- two left lateral slits (first lateral slits) 29a are provided on the left side of the seal box 20 with a vertical interval therebetween. Each lateral slit 29a is provided continuously with a predetermined width across the front wall 21, the left side wall 23, and the rear wall 22. As shown in FIG. Similarly, two right lateral slits (second lateral slits) 29b are provided on the right side of the seal box 20 with a vertical gap therebetween. Each lateral slit 29b is provided continuously with a predetermined width across the front wall 21, the right side wall 24, and the rear wall 22. As shown in FIG. Although the horizontal slits 29a and 29b are provided at the same height position in FIG. 2, they may be provided at different height positions. Also, the number of horizontal slits 29 is not limited to two. The number of horizontal slits 29 may be one, or three or more.
- the front wall 21 and the rear wall 22 of the peripheral wall 25 of the seal box 20 are provided with two expansions 27 for absorbing thermal stress over substantially the entire longitudinal direction and at intervals in the vertical direction. are provided.
- the expansion 27 has a U-shaped cross section and protrudes outward from the peripheral wall 25 (the front wall 21 and the rear wall 22).
- the expansion 27 is provided so as to be continuous with the horizontal slit 29 at the same height position as the horizontal slit 29 .
- the shape of the expansion 27 may be any shape other than the U-shaped cross section as long as it can absorb the thermal stress acting in the vertical direction of the seal box 20 .
- the seal box 20 is provided with a heat-resistant cloth (first sheet member) 35 so as to entirely cover the vertical slits 28, and to entirely cover the horizontal slits 29.
- a plurality of heat-resistant cloths (second sheet members) 36 are provided as shown in FIG.
- These heat-resistant cloths 35 and 36 are formed like cloth by weaving a heat-resistant fiber material (such as glass fiber) that can be used up to 500° C., for example, and have a thickness of about 30 mm, for example. The material, thickness, etc. can be selected as appropriate.
- illustration of the heat-resistant cloth 36 covering the left lateral slit 29a is omitted.
- FIG. 5 is a cross-sectional view showing a state in which the heat-resistant cloth 35 is attached to the ceiling wall 26, and is a cross-sectional view taken along the BB direction in FIG. 6 is a cross-sectional view showing a state in which the heat-resistant cloth 35 is attached to the front wall 21, and is a cross-sectional view taken along arrows CC in FIG.
- the heat-resistant cloth 35 is arranged on the top surface of the ceiling wall 26 so as to cover the vertical slit 28 , and both edges of the heat-resistant cloth 35 are attached to bolts 41 and nuts 42 via pressing plates 40 . is fixed to the ceiling wall 26 by Thereby, the airtightness inside the seal box 20 is ensured. That is, the heat-resistant cloth 35 is attached so as to be in close contact with the ceiling wall 26 so as not to create a gap with the ceiling wall 26 .
- the pressing plate 40 is made of, for example, a metal plate, but any material can be used as long as it has heat resistance.
- the heat-resistant cloth 35 is arranged on the front surface of the front wall 21 so as to cover the vertical slit 28, and both edges of the heat-resistant cloth 35 are attached to the bolts 41 via the pressing plate 40. and a nut 42 to the front wall 21 .
- the lower end of the heat-resistant cloth 35 is fixed at a position slightly higher than the furnace ceiling wall 6 on the front wall 21 while completely covering the vertical slit 28 .
- the heat resistant cloth 35 is not fixed to the furnace ceiling wall 6 . This is because the furnace ceiling wall 6 is made up of heat transfer tubes and fin bars, and it is difficult to attach the heat-resistant cloth 35 to it.
- the heat-resistant cloth 35 and the rear wall 22 are also fixed in the same manner as in FIG.
- the seal box 20 Since the seal box 20 is provided with the expansion 27, the thermal stress acting on the seal box 20 in the vertical direction can be absorbed. Moreover, since the seal box 20 is provided with the vertical slits 28 and the horizontal slits 29, the deformation of the seal box 20 due to the difference in thermal elongation between the manifold 17 and the furnace ceiling wall 6 is absorbed by the vertical slits 28 and the horizontal slits 29. can. As a result, it is possible to prevent the seal box 20 (especially the welded portion) from cracking, and to prevent combustion ash from entering the penthouse 13 through the crack. In addition, it is possible to easily inspect the piping arranged in the penthouse 13 . As described above, since the present embodiment has the vertical slit 28 and the horizontal slit 29, it is more effective in a severe use environment where the expansion 27 alone cannot absorb the thermal stress acting on the seal box 20. do.
- FIG. 7 is an external perspective view of the seal box 120 according to the second embodiment.
- the seal box 120 according to the second embodiment differs from the seal box 20 according to the first embodiment in that the vertical slit 28 and the horizontal slit 29 are not provided. Therefore, the heat-resistant cloths 35 and 36 are not provided in the second embodiment.
- the thermal stress acting on the seal box 120 in the vertical direction can be sufficiently absorbed.
- the structure is simple, and cost reduction can be expected because there is no need to provide a heat-resistant cloth. It should be noted that the seal box 120 according to the second embodiment is effectively used in a usage environment with a relatively small temperature difference compared to the first embodiment.
- the lateral slits 29a and 29b may not be provided. That is, the seal box 20 may be box-shaped with the vertical slit 38 and the expansion 27 .
- At least one of the vertical slit 28 and the horizontal slit 29 may be provided in the seal box 20, and the expansion 27 may be omitted. That is, the expansion 27 may be removed from the seal box 20 shown in FIG.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Housings, Intake/Discharge, And Installation Of Fluid Heaters (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
Description
図1はボイラの全体構造を示す側面図である。本発明に係るシールボックスは、例えば図1に示すボイラ1に適用される。なお、本明細書において、前後、上下、および左右の方向は、各図に示す通り定義する。
図2は第1実施形態に係るシールボックス20の外観斜視図、図3はシールボックス20のスリットを耐熱クロスで覆った状態の外観斜視図、図4は図3に示すシールボックスを仮想平面Pで切断してA方向から見た縦断面図である。
図7は第2実施形態に係るシールボックス120の外観斜視図である。第2実施形態に係るシールボックス120は、第1実施形態に係るシールボックス20と比べて、縦スリット28および横スリット29が設けられていない点で相違する。そのため、第2実施形態では、耐熱クロス35,36も設けられていない。
2 火炉
3 ケージ部
4 副側壁
5 火炉側壁
6 火炉天井壁(ボイラ天井壁)
7 伝熱管貫通部
10 鉄骨
11,12 吊りボルト
13 ペントハウス
15 伝熱管群
16 ヘッダ
17 マニホールド
20 シールボックス
21 前壁
22 後壁
23 左側壁
24 右側壁
25 周壁
26 天井壁
27 エキスパンション
28 縦スリット
29(29a,29b) 横スリット(第1の横スリット、第2の横スリット)
35 耐熱クロス(第1のシート部材)
36 耐熱クロス(第2のシート部材)
40 押えプレート
41 ボルト
42 ナット
Claims (12)
- ボイラ天井壁の上方の空間であるペントハウス内に設けられ、前記ボイラ天井壁を貫通する伝熱管群を囲うシールボックスであって、
前記シールボックスは、前壁、後壁、左側壁、および右側壁から成る周壁と、前記周壁を上方から覆う天井壁とを有して箱状に形成され、
前記天井壁は、前記伝熱管群が接続されたヘッダと溶接により固定され、
前記周壁の下端は、前記ボイラ天井壁に溶接により固定され、
前記周壁には、前記前壁と前記天井壁と前記後壁とに亘って連続する縦スリットが設けられることを特徴とするシールボックス。 - 請求項1に記載のシールボックスにおいて、
前記縦スリットは、前記シールボックスの長手方向に互いに間隔を空けて複数設けられることを特徴とするシールボックス。 - 請求項1または2に記載のシールボックスにおいて、
前記縦スリットは、耐熱性を有する第1のシート部材により覆われていることを特徴とするシールボックス。 - 請求項3に記載のシールボックスにおいて、
前記第1のシート部材は、押えプレートを介してボルトにより前記周壁に固定されることを特徴とするシールボックス。 - 請求項4に記載のシールボックスにおいて、
前記第1のシート部材の下端は前記周壁の下端より高い位置に固定されることを特徴とするシールボックス。 - 請求項1~5の何れか1項に記載のシールボックスにおいて、
前記周壁のうち少なくとも前記前壁と前記後壁とには、熱応力を吸収するためのエキスパンションが前記シールボックスの長手方向の全体に亘って設けられていることを特徴とするシールボックス。 - 請求項6に記載のシールボックスにおいて、
前記エキスパンションは、断面がコ字状に形成されると共に、前記周壁から外方に突出していることを特徴とするシールボックス。 - 請求項1~7の何れか1項に記載のシールボックスにおいて、
前記周壁には、前記前壁と前記左側壁と前記後壁とに亘って連続する第1の横スリットおよび前記前壁と前記右側壁と前記後壁とに亘って連続する第2の横スリットが設けられることを特徴とするシールボックス。 - 請求項8に記載のシールボックスにおいて、
前記第1の横スリットおよび前記第2の横スリットは、それぞれ上下方向に互いに間隔を空けて複数設けられることを特徴とするシールボックス。 - 請求項8または9に記載のシールボックスにおいて、
前記第1の横スリットおよび前記第2の横スリットは、耐熱性を有する第2のシート部材により覆われていることを特徴とするシールボックス。 - ボイラ天井壁の上方の空間であるペントハウス内に設けられ、前記ボイラ天井壁を貫通する伝熱管群を囲うシールボックスであって、
前記シールボックスは、前壁、後壁、左側壁、および右側壁から成る周壁と、前記周壁を上方から覆う天井壁とを有して箱状に形成され、
前記天井壁は、前記伝熱管群が接続されたヘッダと溶接により固定され、
前記周壁の下端は、前記ボイラ天井壁に溶接により固定され、
前記周壁のうち少なくとも前記前壁と前記後壁とには、熱応力を吸収するためのエキスパンションが前記シールボックスの長手方向の全体に亘って設けられ、
前記エキスパンションは、断面がコ字状に形成されると共に、前記周壁から外方に突出していることを特徴とするシールボックス。 - 請求項11に記載のシールボックスにおいて、
前記エキスパンションは、前記周壁の上下方向に互いに間隔を空けて複数設けられることを特徴とするシールボックス。
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KR1020237029177A KR20230136751A (ko) | 2021-03-05 | 2022-02-17 | 실 박스 |
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JP2021035547A JP2022135617A (ja) | 2021-03-05 | 2021-03-05 | シールボックス |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56173801U (ja) * | 1980-05-27 | 1981-12-22 | ||
JPS5876251A (ja) * | 1981-10-31 | 1983-05-09 | 三菱重工業株式会社 | 伸縮自在板 |
JPH02115611U (ja) * | 1989-03-02 | 1990-09-17 | ||
JPH11223304A (ja) * | 1998-02-05 | 1999-08-17 | Babcock Hitachi Kk | 火炉壁貫通部のシール構造 |
JPH11223303A (ja) * | 1998-02-04 | 1999-08-17 | Babcock Hitachi Kk | ボイラ火炉壁伝熱管貫通部のシール構造 |
-
2021
- 2021-03-05 JP JP2021035547A patent/JP2022135617A/ja active Pending
-
2022
- 2022-02-17 KR KR1020237029177A patent/KR20230136751A/ko unknown
- 2022-02-17 WO PCT/JP2022/006389 patent/WO2022185940A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56173801U (ja) * | 1980-05-27 | 1981-12-22 | ||
JPS5876251A (ja) * | 1981-10-31 | 1983-05-09 | 三菱重工業株式会社 | 伸縮自在板 |
JPH02115611U (ja) * | 1989-03-02 | 1990-09-17 | ||
JPH11223303A (ja) * | 1998-02-04 | 1999-08-17 | Babcock Hitachi Kk | ボイラ火炉壁伝熱管貫通部のシール構造 |
JPH11223304A (ja) * | 1998-02-05 | 1999-08-17 | Babcock Hitachi Kk | 火炉壁貫通部のシール構造 |
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JP2022135617A (ja) | 2022-09-15 |
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