JPH11118102A - Seal structure of boiler ceiling wall through part - Google Patents
Seal structure of boiler ceiling wall through partInfo
- Publication number
- JPH11118102A JPH11118102A JP28377797A JP28377797A JPH11118102A JP H11118102 A JPH11118102 A JP H11118102A JP 28377797 A JP28377797 A JP 28377797A JP 28377797 A JP28377797 A JP 28377797A JP H11118102 A JPH11118102 A JP H11118102A
- Authority
- JP
- Japan
- Prior art keywords
- ceiling wall
- heat transfer
- furnace
- transfer tube
- sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ボイラ火炉外から
天井壁を貫通して火炉内に延びる伝熱管の天井壁貫通孔
のシール構造に係り、特にボイラ起動停止時や負荷変化
時に貫通伝熱管と天井壁の相対変位が大きなボイラに好
適なシール構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure for a through hole in a ceiling wall of a heat transfer tube extending from the outside of a boiler furnace through a ceiling wall and into the furnace. And a ceiling structure suitable for a boiler having a large relative displacement between the ceiling wall and the ceiling wall.
【０００２】[0002]
【従来の技術】図１２に発電用大型ボイラの一般的な構
造を示す。このようなボイラでは、伝熱管をパネル状に
溶接して鉄骨１から吊るした炉壁２及び天井壁３によ
り、密閉した火炉４を形成する。火炉４の上方には過熱
器及び再熱器の管寄せ５が設置され、管寄せ５に接続す
る伝熱管６は天井壁３の上方に貫通部７を通って火炉４
に至り、過熱器及び再熱器の伝熱管群８となる。2. Description of the Related Art FIG. 12 shows a general structure of a large-sized boiler for power generation. In such a boiler, a closed furnace 4 is formed by a furnace wall 2 and a ceiling wall 3 suspended from a steel frame 1 by welding heat transfer tubes in a panel shape. A superheater and a reheater header 5 are installed above the furnace 4, and a heat transfer tube 6 connected to the header 5 is connected to the furnace 4 through a penetration 7 above the ceiling wall 3.
To form the heat transfer tube group 8 of the superheater and the reheater.
【０００３】伝熱管６は火炉４内で１，０００℃以上の
燃焼ガスによって加熱されており、内部流体である蒸気
も高温となるために管全体が熱膨張によって下方に伸び
る。一方、天井壁３を鉄骨１から吊るしているハンガ９
は天井壁管からの熱伝導で温度が上がるものの伝熱管６
ほど高温にはならないため、熱膨張による伸び量は小さ
い。天井壁３の貫通部７において伝熱管６と天井壁３の
相対的な変位は数１０〜１００ｍｍ以上にも達する。The heat transfer tube 6 is heated in the furnace 4 by a combustion gas at a temperature of 1,000 ° C. or more, and the steam as an internal fluid also has a high temperature, so that the entire tube extends downward due to thermal expansion. On the other hand, a hanger 9 suspending the ceiling wall 3 from the steel frame 1.
Is the heat transfer tube 6 although the temperature rises due to heat conduction from the ceiling wall tube.
Since the temperature is not so high, the amount of elongation due to thermal expansion is small. The relative displacement between the heat transfer tube 6 and the ceiling wall 3 in the penetrating portion 7 of the ceiling wall 3 reaches several tens to 100 mm or more.
【０００４】このように大きな伸び差が生じるため、天
井壁３の貫通部７を溶接等により密閉した場合、ボイラ
の起動停止や負荷変化時の温度変化に伴う伸び差の繰り
返しにより、当該溶接部には最大な応力が作用し、疲労
破壊を生じる危険性が高い。このため従来は天井壁３の
貫通部７を溶接せず、僅かな隙間を設けて伝熱管６が自
由にスライドできる構造にする場合が多かった。その構
造の一例を図１３に示す。天井壁管１１の一端部はフィ
ンバー１２によって隣接する天井壁管１１と溶接で固定
されているが、伝熱管６の貫通部７にはフィンバー１２
を付けず、シールボックス１３及びスリーブ１４を設置
してスリーブ１４の中に伝熱管６を通すものである。[0004] Since such a large difference in elongation occurs, when the penetrating portion 7 of the ceiling wall 3 is sealed by welding or the like, the difference in elongation due to the temperature change when the boiler is started or stopped and the load changes is repeated. Is subjected to maximum stress, and there is a high risk of causing fatigue fracture. For this reason, in the related art, a structure in which the heat transfer tube 6 can freely slide with a small gap is often provided without welding the through portion 7 of the ceiling wall 3. FIG. 13 shows an example of the structure. One end of the ceiling wall tube 11 is fixed to the adjacent ceiling wall tube 11 by welding with a fin bar 12.
The heat transfer tube 6 is passed through the sleeve 14 by installing the seal box 13 and the sleeve 14 without attaching the seal box 13.
【０００５】近年大容量ボイラの主力となっている石炭
焚ボイラでは、通常、運転時は火炉内が僅かに負荷とな
っているが、バーナの着火や消火時等、過渡的な運転状
態においては一時的に火炉内が僅かに正圧（１ｋｇ／ｃ
ｍ2以下）になる場合があり、その期間は火炉内の燃焼
灰が上述の隙間１６から火炉上部の天井室１０に吹出
し、堆積する。[0005] In a coal-fired boiler, which has recently become the mainstay of large-capacity boilers, the load inside the furnace is usually a slight load during operation. Temporarily a slight positive pressure (1 kg / c
m2), during which time the combustion ash in the furnace blows out from the gap 16 into the ceiling chamber 10 above the furnace and accumulates.
【０００６】灰の侵入防止策として、この隙間１６にガ
ラス繊維等の断熱材を詰込む対策もしばしば採られては
いるが、運転中に脱落することが多く、効果は持続しな
い。天井室１０内の燃焼灰の除去は２年に１度の定期検
査時しか行うことができないが、大量に堆積した燃焼灰
の除去作業は多大な労力と時間を要するため、天井室１
０内の管寄せ５や配管類の点検の工程上、大きな障害と
なっていた。As a measure to prevent the intrusion of ash, a measure of filling the gap 16 with a heat insulating material such as glass fiber is often adopted, but it often falls off during operation and the effect is not sustained. Although the removal of the combustion ash in the ceiling chamber 10 can be performed only at the time of a periodic inspection once every two years, the work of removing the combustion ash deposited in large quantities requires a great deal of labor and time.
This was a major obstacle in the inspection process of the header 5 and the piping in 0.
【０００７】天井室１０内への灰の侵入を防止するた
め、天井壁３の貫通部７で伸び差を吸収しつつ隙間を密
閉する溶接構造が種々検討されてきた（例えば特開平６
−１３７５０６号公報、特開平８−５００４号公報、実
開平７−３２３０９号公報）が、いずれも構造が複雑な
上、疲労破壊に対する危険性が完全に回避されていない
のが実情である。[0007] In order to prevent ash from entering the ceiling chamber 10, various welding structures have been studied in which the gap is closed while absorbing the difference in elongation at the penetrating portion 7 of the ceiling wall 3 (for example, Japanese Unexamined Patent Application Publication No. Hei 6 (1994)).
No. 137506, Japanese Unexamined Patent Application Publication No. 8-5004, and Japanese Unexamined Utility Model Publication No. 7-32309) have a complicated structure, and the danger of fatigue fracture is not completely avoided.
【０００８】[0008]
【発明が解決しようとする課題】本発明の目的は、上記
した従来技術の問題点を解消し、天井壁の貫通部におい
て伝熱管と天井壁を密閉溶接せずに、天井壁の貫通部の
隙間から天井室内に燃焼灰が侵入するのを防止するシー
ル構造を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and to prevent the heat transfer tube and the ceiling wall from being hermetically welded at the penetration portion of the ceiling wall. An object of the present invention is to provide a seal structure for preventing combustion ash from entering a ceiling room from a gap.
【０００９】[0009]
【課題を解決するための手段】前記課題を解決するため
に、本発明は主として次のような構成を採用する。In order to solve the above problems, the present invention mainly employs the following configuration.
【００１０】ボイラ火炉外からボイラ天井壁を貫通して
火炉内に延びる伝熱管の天井壁貫通部のシール構造にお
いて、伝熱管を通すための円孔を有し且つ空気配管を接
続したシールボックスを貫通部周辺の天井壁に溶接固定
し、別途設置した火炉圧力計の信号に基づき火炉の圧力
が正圧となった時にシールボックスに高圧空気を送給し
て、シールボックス内の圧力を火炉圧力より高くするボ
イラ天井壁貫通部のシール構造。[0010] In the sealing structure of the ceiling wall penetration portion of the heat transfer tube extending from the outside of the boiler furnace through the boiler ceiling wall and into the furnace, a seal box having a circular hole for passing the heat transfer tube and connected to an air pipe is provided. High pressure air is fed to the seal box when the furnace pressure becomes positive based on the signal from the separately installed furnace pressure gauge, welded and fixed to the ceiling wall around the penetration, and the pressure inside the seal box is set to the furnace pressure. Seal structure at the boiler ceiling wall penetration to make it higher.
【００１１】更に、ボイラ火炉外からボイラ天井壁を貫
通して火炉内に延びる伝熱管の天井壁貫通部のシール構
造において、前記貫通部周辺の天井壁に溶接固定したシ
ールボックスの円孔部分にスリーブを溶接し、円筒状に
整形した金属メッシュの一端をスリーブと伝熱管の隙間
に挿入し、他端をスリーブの外側に折り返してスリーブ
に接合するボイラ天井壁貫通部のシール構造。Further, in the seal structure of the ceiling wall penetration portion of the heat transfer tube extending from the outside of the boiler furnace through the boiler ceiling wall and into the furnace, the seal structure is welded and fixed to the ceiling wall around the penetration portion. A seal structure for a penetration portion of a boiler ceiling wall in which one end of a metal mesh formed into a cylindrical shape by welding a sleeve is inserted into a gap between the sleeve and the heat transfer tube, and the other end is folded outside the sleeve and joined to the sleeve.
【００１２】[0012]
【発明の実施の形態】以下、本発明の第１の実施形態に
ついて、図１、図２および図３を用いて詳細に説明す
る。ここにおいて、６は伝熱管、１１は天井壁管、１２
はフィンバー、１３はシールドボックス、１４はスリー
ブ、１５は溶接部、１６は隙間、１７は空気配管、１８
は断熱材、１９は上段シールドボックス、２０は金属フ
ィルタ、２１は電磁弁、２２はコンプレッサ、２３は火
炉圧力計、をそれぞれ表す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. 1, 2 and 3. Here, 6 is a heat transfer tube, 11 is a ceiling wall tube, 12
Is a fin bar, 13 is a shield box, 14 is a sleeve, 15 is a welded portion, 16 is a gap, 17 is an air pipe, 18
Denotes a heat insulating material, 19 denotes an upper shield box, 20 denotes a metal filter, 21 denotes a solenoid valve, 22 denotes a compressor, and 23 denotes a furnace pressure gauge.
【００１３】図１及び図２は、本発明になる天井壁シー
ル構造の側面図及び平面図である。従来構造と同様に、
天井壁管１１の上面にシールボックス１３を設置し、こ
のシールボックス１３にスリーブ１４を溶接する。シー
ルボックス１３及びスリーブ１４は、予め伝熱管群の製
作時に伝熱管６に通しておいてもよいし、本実施形態の
ように紙面左右方向に分割して製作し、現地で伝熱管６
を挾むように固定してもよい。シールボックス１３に空
気配管１７を接続し、これを外部のコンプレッサ等高圧
の空気源に接続する。伝熱管６とスリーブ１４の隙間が
大きい場合には、断熱材１８を詰めておく。FIGS. 1 and 2 are a side view and a plan view of a ceiling wall sealing structure according to the present invention. Like the conventional structure,
A seal box 13 is installed on the upper surface of the ceiling wall tube 11, and a sleeve 14 is welded to the seal box 13. The seal box 13 and the sleeve 14 may be passed through the heat transfer tubes 6 in advance when the heat transfer tube group is manufactured, or may be manufactured by dividing the heat transfer tube groups in the left-right direction of the paper as in the present embodiment.
May be fixed. An air pipe 17 is connected to the seal box 13 and connected to a high-pressure air source such as an external compressor. When the gap between the heat transfer tube 6 and the sleeve 14 is large, the heat insulating material 18 is packed.
【００１４】図３は本発明の動作、作用を示すための系
統図である。シールボックス１３は空気配管１７によっ
てコンプレッサ２２等の高圧空気源に接続されており、
空気配管１７の途中に電磁弁２１を設ける。空気源の圧
力は一般動力用の７ｋｇ／ｃｍ2程度あれば十分であ
る。電磁弁２１は火炉圧力計２３の信号に基づき、火炉
圧力が正圧になった時に開となり、火炉圧力が負になっ
た時に閉となるようにリレー回路を設定する。ボイラ運
転中に火炉内の圧力が正圧になったことを火炉圧力計２
３が検知すると電磁弁２１が開き、瞬時にシールボック
ス１３内の圧力を高めるので、火炉側から侵入しようと
する燃焼灰を吹き戻し、天井室１０への灰の侵入を防止
する。FIG. 3 is a system diagram showing the operation and operation of the present invention. The seal box 13 is connected to a high-pressure air source such as a compressor 22 by an air pipe 17,
An electromagnetic valve 21 is provided in the air pipe 17. An air source pressure of about 7 kg / cm 2 for general power is sufficient. Based on the signal from the furnace pressure gauge 23, the solenoid valve 21 sets a relay circuit so that it opens when the furnace pressure becomes positive and closes when the furnace pressure becomes negative. The furnace pressure gauge 2 indicates that the pressure inside the furnace became positive during boiler operation.
When 3 is detected, the solenoid valve 21 is opened and the pressure in the seal box 13 is instantaneously increased, so that the combustion ash that is about to enter from the furnace side is blown back to prevent the ash from entering the ceiling chamber 10.
【００１５】本発明によれば、簡単なシール構造で天井
室１０への燃焼灰の侵入を防止できる上、伝熱管６と天
井壁管１１を相互に溶接固定していないため、両者の相
対変位による疲労破壊の恐れは皆無である。また本実施
形態の基本構造は従来のシールボックス１３に空気配管
１７を加えただけのものであり、大型のボイラは通常、
火炉圧力計２３や動力用コンプレッサ２２を備えている
ので、新缶だけでなく既設缶に対して適用する場合も容
易に実施できる。According to the present invention, invasion of combustion ash into the ceiling chamber 10 can be prevented with a simple sealing structure, and the heat transfer tube 6 and the ceiling wall tube 11 are not welded and fixed to each other, so that the relative displacement between the two can be prevented. There is no danger of fatigue destruction. In addition, the basic structure of the present embodiment is the same as the conventional seal box 13 except that the air pipe 17 is added.
Since the furnace pressure gauge 23 and the power compressor 22 are provided, the present invention can be easily applied not only to new cans but also to existing cans.
【００１６】次に、本発明の第２の実施形態について、
図面を用いて説明する。図４に示すように、伝熱管貫通
部の内側に短いフィンバー１２’を取り付けた構造を備
えている。基本的な考え方は前記第１の実施形態と同一
であるが、短いフィンバー１２’によって伝熱管６の周
囲の隙間を小さくしたものである。シールボックス１３
に空気供給管１７から空気を供給した際に火炉側へ空気
が抜けにくくなり、シールボックス１３内の圧力を高め
てシール効果を高めると同時に消費する空気量も低減で
きる。Next, a second embodiment of the present invention will be described.
This will be described with reference to the drawings. As shown in FIG. 4, a structure is provided in which a short fin bar 12 'is attached inside the heat transfer tube penetrating portion. The basic concept is the same as that of the first embodiment, except that the gap around the heat transfer tube 6 is reduced by the short fin bar 12 '. Seal box 13
When air is supplied from the air supply pipe 17 to the furnace, it is difficult for air to escape to the furnace side, and the pressure in the seal box 13 is increased to enhance the sealing effect and at the same time reduce the amount of air consumed.
【００１７】次に、本発明の第３の実施形態について、
図面を用いて説明する。図５に示すように、シールボッ
クス１３を２段とし、上段に空気配管１７を接続した構
造を備えている。基本的な考え方は第２の実施形態と同
一であるが、本実施形態では上段と下段の中間にもスリ
ーブ１４を設けて第２の実施形態より隙間を小さくして
あるため、シールボックス１３に送給した空気が火炉側
へ抜けにくく、より高いシール効果が得られる。また既
設シールボックスに本実施形態を適用する際、天井壁３
の上側からの作業だけで改造できるため、容易に実施で
きる。Next, a third embodiment of the present invention will be described.
This will be described with reference to the drawings. As shown in FIG. 5, there is provided a structure in which the seal box 13 has two stages and an air pipe 17 is connected to the upper stage. The basic concept is the same as that of the second embodiment. However, in this embodiment, a sleeve 14 is also provided between the upper stage and the lower stage to make the gap smaller than that of the second embodiment. It is difficult for the supplied air to escape to the furnace side, and a higher sealing effect can be obtained. When the present embodiment is applied to an existing seal box, the ceiling wall 3
It can be easily implemented because it can be remodeled only from above.
【００１８】次に、本発明の第４の実施形態について、
図面を用いて説明する。図６に示すように、スリーブ１
４の開口部を金属製のメッシュ２０で覆った構造を備え
ている。基本的な考え方は第２の実施形態と同一である
が、本実施形態では燃焼灰が目詰まりする２００メッシ
ュ程度の細かい金属メッシュ２０を筒状に整形し、この
中に伝熱管６とスリーブ１４の上端を通したものであ
る。Next, regarding a fourth embodiment of the present invention,
This will be described with reference to the drawings. As shown in FIG.
4 has a structure in which the opening is covered with a metal mesh 20. Although the basic concept is the same as that of the second embodiment, in this embodiment, a fine metal mesh 20 of about 200 mesh in which combustion ash is clogged is formed into a cylindrical shape, and the heat transfer tube 6 and the sleeve 14 are formed therein. Through the top of
【００１９】金属メッシュ２０の上端及び下端は伝熱管
６及びスリーブ１４に直接溶接止めすればよいし、金属
製の帯状金具や金属線を巻付けて固定してもよい。金属
メッシュ２０は伝熱管６とスリーブ１４の隙間を塞ぐた
めのものであるが、伝熱管６と天井壁３の相対変位が生
じた場合も容易に変形でき、従来の断熱材のようにつぶ
れて脱落することはない。逆に、火炉４から漏れ出た燃
焼灰が金属メッシュ２０に詰まって長期間使用するほ
ど、シール効果が向上する。The upper and lower ends of the metal mesh 20 may be directly welded to the heat transfer tube 6 and the sleeve 14, or may be fixed by winding a metal band or metal wire. The metal mesh 20 is for closing the gap between the heat transfer tube 6 and the sleeve 14. However, even when the heat transfer tube 6 and the ceiling wall 3 are displaced relative to each other, the metal mesh 20 can be easily deformed and collapsed like a conventional heat insulating material. Will not fall off. Conversely, the longer the combustion ash leaked from the furnace 4 is clogged in the metal mesh 20 and used for a long time, the better the sealing effect is.
【００２０】本実施形態の金属メッシュ２０は、実施形
態１、２、３のものと組み合わせれば、各実施形態のシ
ール効果をさらに高めることができる。If the metal mesh 20 of the present embodiment is combined with the metal meshes of the first, second and third embodiments, the sealing effect of each embodiment can be further enhanced.
【００２１】次に、本発明の第５の実施形態について図
面を用いて説明する。図７および図８は第５の実施形態
における天井壁シール構造の側面図および平面図であ
る。従来構造と同様に、天井壁缶１１の上面にシールボ
ックス１３を設置し、このシールボックス１３にスリー
ブ１４を溶接する。シールボックス１３およびスリーブ
１４は、予め伝熱管群の製作時に伝熱管６に通しておい
てもよいし、本実施形態のように紙面左右方向に分割し
て製作し、現地で伝熱管６を挟むように固定しても良
い。Next, a fifth embodiment of the present invention will be described with reference to the drawings. 7 and 8 are a side view and a plan view of the ceiling wall sealing structure according to the fifth embodiment. As in the case of the conventional structure, a seal box 13 is installed on the upper surface of the ceiling wall can 11, and a sleeve 14 is welded to the seal box 13. The seal box 13 and the sleeve 14 may be passed through the heat transfer tubes 6 in advance when the heat transfer tube group is manufactured, or may be manufactured by dividing the heat transfer tube groups in the left-right direction of the paper as in the present embodiment, and sandwiching the heat transfer tubes 6 on site. May be fixed as follows.
【００２２】次に、内径が伝熱管６の外径とほぼ等しい
円筒状に形成した金属メッシュ２０を用意し、この金属
メッシュ２０の中に伝熱管６を通す。金属メッシュの粗
さは燃焼灰が容易に目詰まりするように＃２００程度よ
り目の細かいものを用いる。スリーブ１４の上部を包み
込むように金属メッシュ２０の上端を外側に折り返し、
その端部をスリーブ１４の外面に接合する。金属メッシ
ュ２０と伝熱管６は金属同士のため溶接あるいはろう付
けで容易に接合できるし、金属性のバンドを巻いて締め
付けてもよい。図７では溶接で接合した。Next, a cylindrical metal mesh 20 having an inner diameter substantially equal to the outer diameter of the heat transfer tube 6 is prepared, and the heat transfer tube 6 is passed through the metal mesh 20. The roughness of the metal mesh is finer than about # 200 so that the combustion ash is easily clogged. The upper end of the metal mesh 20 is turned outward so as to wrap the upper part of the sleeve 14,
Its end is joined to the outer surface of the sleeve 14. Since the metal mesh 20 and the heat transfer tube 6 are metals, they can be easily joined by welding or brazing, or a metal band may be wound and fastened. In FIG. 7, they were joined by welding.
【００２３】この状態でボイラを起動して伝熱管６が熱
膨張により下方に伸びても、金属メッシュ２０と伝熱管
６は互いに固定していないため、相対変位は自由であ
る。ボイラ運転中に火炉内が正圧になった場合、金属メ
ッシュ２０とスリーブ１４の隙間に圧力がかかり、金属
メッシュ２０の折り返し部分が広がろうとするため、金
属メッシュ２０と伝熱管６の隙間はつぶれ、火炉内から
の燃焼灰の侵入を抑えることができる。Even if the boiler is started in this state and the heat transfer tube 6 extends downward due to thermal expansion, the relative displacement is free because the metal mesh 20 and the heat transfer tube 6 are not fixed to each other. If the pressure inside the furnace becomes positive during boiler operation, pressure is applied to the gap between the metal mesh 20 and the sleeve 14, and the folded portion of the metal mesh 20 tends to widen. Crushing and intrusion of combustion ash from inside the furnace can be suppressed.
【００２４】本発明によれば、簡単なシール構造で天井
室への燃焼灰の侵入を防止できる上、伝熱管と天井壁管
を相互に溶接固定していないため、従来のシール溶接構
造の場合のように疲労破壊を生ずるような過大な応力は
発生せず、疲労破壊の恐れは皆無である。また金属製の
メッシュを用いるため、繰返し変形しても従来のガラス
繊維の断熱材のように敗れて脱落することもなく、１〜
２年間の接続的な効果が得られる。According to the present invention, the combustion ash can be prevented from entering the ceiling chamber with a simple seal structure, and the heat transfer tube and the ceiling wall tube are not fixed to each other by welding. As described above, no excessive stress that causes fatigue failure occurs, and there is no fear of fatigue failure. In addition, since the metal mesh is used, even if it is repeatedly deformed, it does not lose and fall off like a conventional glass fiber heat insulating material.
A two-year connected effect can be obtained.
【００２５】次に、本発明の第６の実施形態について図
面を用いて説明する。図９に示すように、スリーブの形
状を変えた構造を備えている。本実施形態では、スリー
ブ１４は上端を細くした円錐形のものを用いる。金属メ
ッシュ２０は第５の実施形態で示したものと同一のもの
を用い、上端を折り返した金属メッシュ２０をスリーブ
１４と伝熱管６の間に挿入する。金属メッシュ２０の一
端は、スリーブ１４に接合する。この場合、金属メッシ
ュ２０の端部の接合部（溶接部１５）がスリーブ１４の
内側となるため、スリーブ１４をシールボックス１３に
取り付ける前に、金属メッシュ２０をシールボックス１
３に固定しておく。金属メッシュ２０はスリーブ１４で
なく図１０のように伝熱管６側に接合してもよい。Next, a sixth embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 9, a structure in which the shape of the sleeve is changed is provided. In this embodiment, the sleeve 14 has a conical shape with a narrow upper end. The same metal mesh 20 as that shown in the fifth embodiment is used, and the metal mesh 20 whose upper end is folded is inserted between the sleeve 14 and the heat transfer tube 6. One end of the metal mesh 20 is joined to the sleeve 14. In this case, since the joining portion (welded portion 15) at the end of the metal mesh 20 is inside the sleeve 14, the metal mesh 20 is attached to the seal box 1 before attaching the sleeve 14 to the seal box 13.
Fix it to 3. The metal mesh 20 may be joined to the heat transfer tube 6 instead of the sleeve 14 as shown in FIG.
【００２６】本実施形態の作用は第５の実施形態で示し
たものと基本的に同一であるが、金属メッシュ２０の折
り返し部分が逆Ｖ字形になっているため、金属メッシュ
２０と伝熱管６の密着性はより高いものとなる。The operation of this embodiment is basically the same as that of the fifth embodiment. However, since the folded portion of the metal mesh 20 has an inverted V shape, the metal mesh 20 and the heat transfer tubes 6 Has higher adhesion.
【００２７】次に、本発明の第７の実施形態について、
図面を用いて説明する。図１１に示すように、金属メッ
シュの取付方法を変えた構造を備えている。本実施形態
は、二つに折り返した帯状の金属メッシュ２０を伝熱管
６に巻き付け、金属メッシュ２０の合わせ目部分２１を
溶接、ろう付けあるいは半田等にて接合して、筒状に整
形するものである。本実施形態は第５あるいは第６の実
施形態に対して適用できるもので、作用は各々の実施形
態に示した通りであるが、本実施形態を従来の既設缶に
対して現地改造工事で適用する場合、あるいは現地で金
属メッシュを交換補修する場合でも、伝熱管を切断する
必要がなく、容易に実施できるものである。Next, a seventh embodiment of the present invention will be described.
This will be described with reference to the drawings. As shown in FIG. 11, a structure in which the method of attaching the metal mesh is changed is provided. In the present embodiment, a band-shaped metal mesh 20 folded in two is wound around the heat transfer tube 6, and a joint portion 21 of the metal mesh 20 is joined by welding, brazing, soldering, or the like, and shaped into a cylindrical shape. It is. This embodiment can be applied to the fifth or sixth embodiment, and the operation is as shown in each embodiment. However, this embodiment is applied to a conventional existing can by on-site remodeling work. In the case where the heat transfer tube is replaced or the metal mesh is replaced and repaired on site, the heat transfer tube does not need to be cut, and can be easily implemented.
【００２８】以上説明したように、本発明は次のような
構成、機能、作用を奏するものを含むものである。As described above, the present invention includes those having the following configurations, functions, and actions.
【００２９】天井壁貫通部にシールボックスを設け、火
炉圧力が正圧になった時、シールボックスに高圧空気を
供給してシールボックス内の火炉圧力より高める構成を
備えている。A seal box is provided at the penetrating portion of the ceiling wall, and when the furnace pressure becomes positive, high pressure air is supplied to the seal box to increase the furnace pressure within the seal box.
【００３０】また、天井壁の貫通部にシールボックスと
スリーブを設け、円筒状に整形して上部を外側に折り返
した金属メッシュをスリーブと伝熱管の隙間に挿入し、
火路内の圧力で金属メッシュが開いて貫通部の隙間を塞
ぐ構造を備えている。Further, a seal box and a sleeve are provided in a penetrating portion of the ceiling wall, and a metal mesh formed into a cylindrical shape and whose upper portion is turned outward is inserted into a gap between the sleeve and the heat transfer tube.
A structure is provided in which the metal mesh opens due to the pressure in the fire path and closes the gap between the penetration portions.
【００３１】[0031]
【発明の効果】本発明では、ボイラ天井室内への燃焼灰
の侵入を防止できるので、天井室内に設けられている管
寄せや配管等に対するメンテナンスの障害となっていた
堆積灰の除去作業が不要となる。伝熱管と天井壁が互い
に溶接固定されていないため、両者の相対変位が大きい
場合でも疲労破壊の恐れが皆無であり、プラントの安全
性に対する効果も大きい。According to the present invention, the incineration of combustion ash into the boiler ceiling room can be prevented, so that there is no need to remove the deposited ash which has been an obstacle to maintenance of headers and piping provided in the ceiling room. Becomes Since the heat transfer tube and the ceiling wall are not welded and fixed to each other, even when the relative displacement between the two is large, there is no fear of fatigue failure, and the effect on the safety of the plant is great.
【００３２】また金属製のメッシュを用いるため、従来
のガラス繊維等の断熱材のように脱落することもなく、
取り付けも容易である。Further, since a metal mesh is used, the metal mesh does not fall off unlike a conventional heat insulating material such as glass fiber.
Installation is easy.
【００３３】さらに比較的簡単な構造のため、新缶のみ
ならず既設ボイラへの改造も容易に行えるので、経済的
にも大きな効果を得ることができる。Further, since the structure is relatively simple, it is easy to convert not only a new can but also an existing boiler, so that a great effect can be obtained economically.
【図１】本発明の第１の実施形態に係る天井壁貫通部の
シール構造の側面図である。FIG. 1 is a side view of a sealing structure for a ceiling wall penetration according to a first embodiment of the present invention.
【図２】本発明の第１の実施形態に係る天井壁貫通部の
シール構造の平面図である。FIG. 2 is a plan view of a sealing structure of a ceiling wall penetration portion according to the first embodiment of the present invention.
【図３】本発明の動作を示すための系統図である。FIG. 3 is a system diagram showing the operation of the present invention.
【図４】本発明の第２の実施形態に係る天井壁貫通部の
シール構造の側面図である。FIG. 4 is a side view of a ceiling wall penetration structure according to a second embodiment of the present invention.
【図５】本発明の第３の実施形態に係る天井壁貫通部の
シール構造の側面図である。FIG. 5 is a side view of a sealing structure for a ceiling wall penetration according to a third embodiment of the present invention.
【図６】本発明の第４の実施形態に係る天井壁貫通部の
シール構造の側面図である。FIG. 6 is a side view of a ceiling wall sealing structure according to a fourth embodiment of the present invention.
【図７】本発明の第５の実施形態に係る天井壁貫通部の
シール構造の側面図である。FIG. 7 is a side view of a ceiling wall penetration structure according to a fifth embodiment of the present invention.
【図８】本発明の第５の実施形態に係る天井壁貫通部の
シール構造の平面図である。FIG. 8 is a plan view of a sealing structure of a ceiling wall penetration according to a fifth embodiment of the present invention.
【図９】本発明の第６の実施形態に係る天井壁貫通部の
シール構造の側面図である。FIG. 9 is a side view of a ceiling wall penetration structure according to a sixth embodiment of the present invention.
【図１０】本発明の第６の実施形態に係る天井壁貫通部
のシール構造の変形例を示す側面図である。FIG. 10 is a side view showing a modification of the sealing structure of the ceiling wall penetration portion according to the sixth embodiment of the present invention.
【図１１】本発明の第７の実施形態に係る天井壁貫通部
のシール構造における金属メッシュの取付方法を示す図
である。FIG. 11 is a view showing a method of attaching a metal mesh in a ceiling wall penetration portion sealing structure according to a seventh embodiment of the present invention.
【図１２】発電用大型ボイラの一般的な構造例を示す図
である。FIG. 12 is a diagram showing a general structure example of a large-sized boiler for power generation.
【図１３】従来技術による天井壁貫通部のシール構造の
一例を示す図である。FIG. 13 is a view showing an example of a sealing structure of a ceiling wall penetration portion according to a conventional technique.
１ 鉄骨 ２ 炉壁 ３ 天井壁 ４ 火炉 ５ 管寄せ ６ 伝熱管 ７ 貫通部 ８ 伝熱管群 ９ ハンガ １０ 天井室 １１ 天井壁管 １２ フィンバー １３ シールドボックス １４ スリーブ １５ 溶接部 １６ 隙間 １７ 空気配管 １８ 断熱材 １９ 上段シールドボックス ２０ 金属フィルタ ２１ 電磁弁 ２２ コンプレッサ ２３ 火炉圧力計 DESCRIPTION OF SYMBOLS 1 Steel frame 2 Furnace wall 3 Ceiling wall 4 Furnace 5 Header 6 Heat transfer tube 7 Penetration part 8 Heat transfer tube group 9 Hanger 10 Ceiling room 11 Ceiling wall tube 12 Fin bar 13 Shield box 14 Sleeve 15 Weld part 16 Gap 17 Air pipe 18 Insulation material 19 Upper shield box 20 Metal filter 21 Solenoid valve 22 Compressor 23 Furnace pressure gauge
Claims (8)
て火炉内に延びる伝熱管の天井壁貫通部のシール構造に
おいて、 伝熱管を通すための円孔を有し且つ空気配管を接続した
シールボックスを貫通部周辺の天井壁に溶接固定し、 別途設置した火炉圧力計の信号に基づき火炉の圧力が正
圧となった時にシールボックスに高圧空気を送給して、
シールボックス内の圧力を火炉圧力より高くすることを
特徴とするボイラ天井壁貫通部のシール構造。1. A sealing structure for a ceiling wall penetration portion of a heat transfer tube extending from the outside of a boiler furnace through a boiler ceiling wall into the furnace, wherein the seal has a circular hole for passing the heat transfer tube and is connected to an air pipe. The box is welded and fixed to the ceiling wall around the penetration, and high-pressure air is sent to the seal box when the furnace pressure becomes positive based on the signal from the separately installed furnace pressure gauge,
A sealing structure for a boiler ceiling wall penetration, wherein the pressure in the seal box is higher than the furnace pressure.
ール構造において、 天井壁の貫通部内側に短尺のフィンバーを設け、火炉外
から天井壁を貫通して火炉内に延びる伝熱管との隙間を
小さくすることを特徴とするボイラ天井壁貫通部のシー
ル構造。2. The sealing structure for a boiler ceiling wall penetration part according to claim 1, wherein a short fin bar is provided inside the ceiling wall penetration part, and the heat transfer tube extends from the outside of the furnace through the ceiling wall into the furnace. A seal structure for a boiler ceiling wall penetration, characterized by reducing the gap.
ール構造において、 シールボックスを伝熱管長手方向に沿った２段構造と
し、上段側のシールボックスに空気配管を接続すること
を特徴とするボイラ天井壁貫通部のシール構造。3. The seal structure for a boiler ceiling wall penetration portion according to claim 1, wherein the seal box has a two-stage structure along the longitudinal direction of the heat transfer tube, and an air pipe is connected to the upper seal box. Sealing structure of the boiler ceiling wall penetration.
井壁貫通部のシール構造において、 前記シールボックスの円孔部分に円筒上のスリーブを設
け、 前記スリーブの上部と火炉外から天井壁を貫通して火炉
内に延びる伝熱管を筒状の金属メッシュに通し、 金属メッシュの上端部と下端部を各々伝熱管とスリーブ
に溶接固定することを特徴とするボイラ天井壁貫通部の
シール構造。4. The sealing structure for a boiler ceiling wall penetration part according to claim 1, 2 or 3, wherein a cylindrical sleeve is provided in a circular hole of the seal box, and a ceiling wall is provided from above the sleeve and from outside the furnace. A heat transfer tube extending through the tube into the furnace through a cylindrical metal mesh, and an upper end and a lower end of the metal mesh are welded and fixed to the heat transfer tube and the sleeve, respectively. .
井壁貫通部のシール構造において、 前記シールボックスの円孔部分に円筒上のスリーブを設
け、 前記スリーブの上部と火炉外から天井壁を貫通して火炉
内に延びる伝熱管を筒状の金属メッシュに通し、 金属メッシュの上端部と下端部を各々伝熱管とスリーブ
に金属バンドまたは金属線で締め付けて固定することを
特徴とするボイラ天井壁貫通部のシール構造。5. The sealing structure for a boiler ceiling wall penetration part according to claim 1, 2 or 3, wherein a cylindrical sleeve is provided in a circular hole portion of the seal box, and a ceiling wall is provided from above the sleeve and outside the furnace. Characterized in that a heat transfer tube extending through the furnace into the furnace is passed through a tubular metal mesh, and the upper end and the lower end of the metal mesh are fixed to the heat transfer tube and the sleeve by fastening with a metal band or a metal wire, respectively. Seal structure at the ceiling wall penetration.
て火炉内に延びる伝熱管の天井壁貫通部のシール構造に
おいて、 前記貫通部周辺の天井壁に溶接固定したシールボックス
の円孔部分にスリーブを溶接し、 円筒状に整形した金属メッシュの一端をスリーブと伝熱
管の隙間に挿入し、他端をスリーブの外側に折り返して
スリーブに接合することを特徴とするボイラ天井壁貫通
部のシール構造。6. A sealing structure for a ceiling wall penetrating portion of a heat transfer tube extending from the outside of a boiler furnace through a boiler ceiling wall and extending into the furnace, wherein a circular hole portion of a seal box welded and fixed to the ceiling wall around the penetrating portion. A seal at a penetration portion of a boiler ceiling wall, wherein a sleeve is welded, one end of a metal mesh formed into a cylindrical shape is inserted into a gap between the sleeve and the heat transfer tube, and the other end is folded back to the outside of the sleeve and joined to the sleeve. Construction.
て火炉内に延びる伝熱管の天井壁貫通部のシール構造に
おいて、 前記貫通部周辺の天井壁に溶接固定したシールボックス
の円孔部分に上部を細くした円錐形のスリーブを溶接
し、 円筒状に整形して上部を外側に折り返した金属メッシュ
をスリーブと伝熱管の隙間に挿入し、金属メッシュの一
端をスリーブあるいは伝熱管に接合することを特徴とす
るボイラ天井壁貫通部のシール構造。7. A sealing structure for a ceiling wall penetration portion of a heat transfer tube extending from the outside of a boiler furnace through a boiler ceiling wall and extending into the furnace, wherein a circular hole portion of a seal box welded and fixed to the ceiling wall around the penetration portion. Welding a conical sleeve with a narrow top, shaping it into a cylindrical shape, turning the top outward, inserting a metal mesh into the gap between the sleeve and the heat transfer tube, and joining one end of the metal mesh to the sleeve or heat transfer tube The sealing structure of the boiler ceiling wall penetration.
貫通部のシール構造において、 二つに折り返した帯状の金属メッシュを伝熱管に巻き付
け、金属メッシュの合わせ目部分を接合して筒状に接合
することを特徴とするボイラ天井壁貫通部のシール構
造。8. The sealing structure for a boiler ceiling wall penetration part according to claim 7 or 8, wherein a band-shaped metal mesh folded in two is wound around a heat transfer tube, and a joint portion of the metal mesh is joined to form a cylindrical shape. A seal structure for a boiler ceiling wall penetration, characterized by being joined to a boiler ceiling wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28377797A JPH11118102A (en) | 1997-10-16 | 1997-10-16 | Seal structure of boiler ceiling wall through part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28377797A JPH11118102A (en) | 1997-10-16 | 1997-10-16 | Seal structure of boiler ceiling wall through part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11118102A true JPH11118102A (en) | 1999-04-30 |
Family
ID=17669999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28377797A Pending JPH11118102A (en) | 1997-10-16 | 1997-10-16 | Seal structure of boiler ceiling wall through part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11118102A (en) |
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|---|---|---|---|---|
| WO2009110031A1 (en) | 2008-03-06 | 2009-09-11 | 株式会社Ihi | Method of supplying carbon dioxide to oxygen combustion boiler and apparatus for supplying carbon dioxide |
| WO2011069333A1 (en) * | 2009-12-09 | 2011-06-16 | 上海锅炉厂有限公司 | Thermal insulation and sealing device between boiler platen heating surface tube bundle and furnace ceiling tubes |
| WO2011079503A1 (en) * | 2009-12-28 | 2011-07-07 | 上海锅炉厂有限公司 | Seal box |
| JP2019039576A (en) * | 2017-08-22 | 2019-03-14 | 三菱日立パワーシステムズ株式会社 | Manhole device and installation method for the same |
| CN111351066A (en) * | 2018-12-21 | 2020-06-30 | 三菱日立电力***株式会社 | Sealing structure for boiler, and method for operating boiler |
| CN114087598A (en) * | 2021-11-10 | 2022-02-25 | 杭州智兴热电有限公司 | Continuous drainage waste heat recovery system of circulating fluidized bed boiler |
-
1997
- 1997-10-16 JP JP28377797A patent/JPH11118102A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009110031A1 (en) | 2008-03-06 | 2009-09-11 | 株式会社Ihi | Method of supplying carbon dioxide to oxygen combustion boiler and apparatus for supplying carbon dioxide |
| US8490556B2 (en) | 2008-03-06 | 2013-07-23 | Ihi Corporation | Method and facility for feeding carbon dioxide to oxyfuel combustion boiler |
| WO2011069333A1 (en) * | 2009-12-09 | 2011-06-16 | 上海锅炉厂有限公司 | Thermal insulation and sealing device between boiler platen heating surface tube bundle and furnace ceiling tubes |
| WO2011079503A1 (en) * | 2009-12-28 | 2011-07-07 | 上海锅炉厂有限公司 | Seal box |
| JP2019039576A (en) * | 2017-08-22 | 2019-03-14 | 三菱日立パワーシステムズ株式会社 | Manhole device and installation method for the same |
| CN111351066A (en) * | 2018-12-21 | 2020-06-30 | 三菱日立电力***株式会社 | Sealing structure for boiler, and method for operating boiler |
| CN114087598A (en) * | 2021-11-10 | 2022-02-25 | 杭州智兴热电有限公司 | Continuous drainage waste heat recovery system of circulating fluidized bed boiler |
| CN114087598B (en) * | 2021-11-10 | 2023-11-17 | 杭州智兴热电有限公司 | Continuous drainage waste heat recovery system of circulating fluidized bed boiler |
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