JP5217563B2 - Shielding plug for hot air main repair of industrial furnace and its hot air main repair method - Google Patents

Shielding plug for hot air main repair of industrial furnace and its hot air main repair method Download PDF

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JP5217563B2
JP5217563B2 JP2008087443A JP2008087443A JP5217563B2 JP 5217563 B2 JP5217563 B2 JP 5217563B2 JP 2008087443 A JP2008087443 A JP 2008087443A JP 2008087443 A JP2008087443 A JP 2008087443A JP 5217563 B2 JP5217563 B2 JP 5217563B2
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air main
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JP2009242817A (en
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富美男 柴岡
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JFE Steel Corp
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Description

本発明は、工業炉の熱風本管を部分補修する工事に用いる熱風本管補修用遮蔽プラグおよびその熱風本管補修方法に関する。   TECHNICAL FIELD The present invention relates to a hot air main pipe repair shielding plug used in a construction for partially repairing a hot air main pipe of an industrial furnace and a hot air main pipe repair method.

鉄鋼業をはじめとする各種産業分野において使用されている高炉、熱風炉、加熱炉、熱処理炉などを含めた工業炉の熱風本管には、耐火物やセラミックファイバー等の断熱材がライニングされている。しかし、これらの断熱材は使用中に部分的な損傷が生じることがあり、損傷箇所を補修することが必要である。例えば、高炉に高温の空気を送る熱風炉の熱風本管を部分補修する際には、熱風弁を取り外して開口部を形成した後、耐熱カーテンや熱遮蔽壁により、高温状態にある熱風本管からの輻射熱を防ぎつつ、キャスタブルを吹き付けてレンガ壁を補修するなどの工事を行っていた。これに用いて好適な補修用熱遮蔽装置が提案されている（特許文献１）。   The hot air mains of industrial furnaces including blast furnaces, hot air furnaces, heating furnaces, heat treatment furnaces, etc. used in various industrial fields including the steel industry are lined with heat insulating materials such as refractories and ceramic fibers. Yes. However, these heat insulating materials may be partially damaged during use, and it is necessary to repair the damaged portions. For example, when partially repairing a hot air main of a hot stove that sends high-temperature air to a blast furnace, after removing the hot air valve and forming an opening, a hot air main that is in a high temperature state with a heat-resistant curtain or heat shielding wall While preventing radiant heat from the building, it was repairing the brick wall by spraying castables. A heat shield device for repair suitable for this has been proposed (Patent Document 1).

この特許文献１記載の補修用熱遮蔽装置は、耐熱クロスを縫製した袋に空気を注入すると共に、所定の粒度分布のセラミック粒子を供給して、袋をセラミック粒子で目詰まりさせて膨張させることにより、図７に示すように、熱風本管の一部Ｗを部分補修する際、補修箇所２１の熱遮蔽壁とするものである。図中、２０は、耐熱クロスを縫製した袋体を膨らませてなる従来の熱遮蔽壁を示し、２０Ａはホース、２０Ｂは流量計、圧力形付のバルブスタンド、２０Ｃはコンプレッサを示す。このような補修用熱遮蔽装置によれば、熱遮蔽壁の設置、撤去が容易かつ迅速に行え、それにかかる時間を短くできる。   The heat shield device for repair described in Patent Document 1 injects air into a bag sewn with a heat-resistant cloth, supplies ceramic particles having a predetermined particle size distribution, and clogs the bag with ceramic particles to expand the bag. Thus, as shown in FIG. 7, when partially repairing a part W of the hot air main pipe, the heat shielding wall of the repair location 21 is used. In the figure, 20 indicates a conventional heat shielding wall formed by inflating a bag body sewn with a heat-resistant cloth, 20A indicates a hose, 20B indicates a flow meter, a pressure-equipped valve stand, and 20C indicates a compressor. According to such a heat shield device for repair, the heat shield wall can be easily and quickly installed and removed, and the time required for the heat shield wall can be shortened.

ところで熱風本管の送風を停止した後、十分冷却してから熱風本管の一部を部分補修するようにしたのでは、操業上及びエネルギー上からも極めて損失が大きくなる。このため、熱風本管の送風を停止した後、早期に補修工事を開始し、短時間のうちに所定の補修工事を完了し、送風を再開することが要求される。
特許第３７６４０５２号公報 By the way, after stopping the blowing of the hot air main pipe and sufficiently cooling it and then partially repairing the hot air main pipe, the loss becomes extremely large in terms of operation and energy. For this reason, after stopping the blowing of the hot air main pipe, it is required to start the repair work at an early stage, complete the predetermined repair work within a short time, and restart the blowing.
Japanese Patent No. 3764052

しかしながら、特許文献１記載の補修用熱遮蔽装置は、耐熱クロスを縫製した袋体を空気で膨らませて熱遮蔽壁としているだけであるから、熱風本管の送風を停止した後、早期に補修工事を開始しようとすると、従来以上に高温状態にある熱風本管からの輻射熱を効果的に防ぐことが難しいという問題がある。
すなわち、特許文献１記載の補修用熱遮蔽装置は、耐熱クロス製の袋体とその中の空気とで熱遮蔽壁を形成しているから、熱風本管の一部を部分補修する際、輻射熱の遮蔽効果に優れる熱遮蔽壁とするには、外径が２ｍにも及ぶほぼ球形の断熱風船とする必要がある。 However, since the heat shield device for repair described in Patent Document 1 merely inflates a bag body sewn with a heat resistant cloth with air to form a heat shield wall, repair work is performed early after stopping the blowing of hot air mains. If it is going to start, there exists a problem that it is difficult to prevent effectively the radiant heat from the hot-air main pipe | tube which is in a hotter state than before.
That is, since the heat shield device for repair described in Patent Document 1 forms a heat shield wall with a bag body made of heat resistant cloth and air therein, when partially repairing a part of the hot air main, radiant heat In order to obtain a heat shielding wall having an excellent shielding effect, it is necessary to form a substantially spherical insulated balloon having an outer diameter of 2 m.

このため、熱遮蔽壁の管軸方向長さが長くなってしまい、熱風本管の一部を部分補修する補修箇所の近くに、十分長い設置するスペースがない場合には、補修用熱遮蔽装置を適用できなくなる。
本発明は、上記従来技術の問題点を解消し、熱風本管の一部を部分補修する際に、輻射熱の遮蔽効果に優れる熱遮蔽壁とすることができると共に、その設置と撤去が容易かつ迅速に行える熱風本管補修用遮蔽プラグおよびその熱風本管補修方法を提供することを目的とする。 For this reason, if the length of the heat shield wall in the tube axis direction becomes long, and there is no space to install long enough near the repair location for partially repairing the hot air main pipe, the heat shield device for repair Cannot be applied.
The present invention solves the above-mentioned problems of the prior art, and when partially repairing a hot air main pipe, it can be a heat shielding wall excellent in the shielding effect of radiant heat, and its installation and removal are easy and It is an object of the present invention to provide a hot-air main repair shielding plug and a hot-air main repair method that can be performed quickly.

本発明者らは、鋭意検討し、熱風本管の一部を部分補修する際に、以下のような構造の熱風本管補修用遮蔽プラグを用いることで、上記課題を解決できるとの知見に基づき本発明をなした。
１. 工業炉の熱風本管を部分補修する工事に用いる熱風本管補修用遮蔽プラグであって、耐熱クロスを縫製してなる袋体を外周に設けた第１の熱遮蔽部と、展開可能なシール板を外周に設けた第２の熱遮蔽部と、第１、第２の熱遮蔽部を管内側からこの順に管軸方向に近接配置した状態で接続してなる接続部材と、前記袋体を圧縮空気で膨らませる圧縮空気の通路を具備し、前記接続部材を介して吊り上げ可能に構成されてなることを特徴とする工業炉の熱風本管補修用遮蔽プラグ。 The present inventors diligently studied and found that the above problem can be solved by using a hot-air main repair shielding plug having the following structure when partially repairing a hot-air main. Based on this invention.
1. Hot air main pipe repair shielding plug used for the construction of repairing the hot air main pipe of an industrial furnace, which can be deployed with a first heat shielding section having a bag body formed by sewing a heat-resistant cloth on the outer periphery. A second heat shield part provided with a sealing plate on the outer periphery, a connecting member formed by connecting the first and second heat shield parts in the tube axis direction in this order from the inside of the pipe, and the bag A shielded plug for repairing hot air mains in an industrial furnace, comprising a compressed air passage for inflating the body with compressed air and capable of being lifted through the connecting member.

２. 前記熱遮蔽部がそれぞれ、前記袋体あるいは前記シール板を保持する保持板と、その管内側の面に取り付けてなる断熱材とを有することを特徴とする上記１.に記載の工業炉の熱風本管補修用遮蔽プラグ。
３. 前記袋体は、複数の環状部分同士を補強テープで繋ぎ合わして構成されていることを特徴とする上記１.又は２.に記載の工業炉の熱風本管補修用遮蔽プラグ。 2. The industrial furnace according to 1 above, wherein each of the heat shielding portions includes a holding plate for holding the bag body or the seal plate, and a heat insulating material attached to a surface inside the tube. Shield plug for hot air main repair.
3. The shielding plug for hot air main pipe repair of an industrial furnace as described in 1 or 2 above, wherein the bag body is formed by connecting a plurality of annular portions with a reinforcing tape.

４. 前記シール板がその厚みよりも厚いフラットバーに固定したスプリング付蝶番を介して展開する構造を有することを特徴とする上記１.〜３.のいずれかに記載の工業炉の熱風本管補修用遮蔽プラグ。
５. 前記スプリング付蝶番を固定してなるフラットバーの中央には、一方向に延在するワイヤー取付板の一端が固定され、かつその他端にワイヤー取付孔が形成されていることを特徴とする上記４.に記載の工業炉の熱風本管補修用遮蔽プラグ。 4. The hot air main of an industrial furnace as described in any one of 1 to 3 above, wherein the seal plate has a structure that unfolds via a hinge with a spring fixed to a flat bar that is thicker than its thickness. Shield plug for repair.
5. At the center of the flat bar formed by fixing the hinge with spring, one end of a wire attachment plate extending in one direction is fixed, and a wire attachment hole is formed at the other end. A shielding plug for hot air main pipe repair of an industrial furnace as described in 4 above.

６. 前記接続部材が管状の送風管とされ、前記袋体を保持する風船保持板の中央部に送風孔が形成され、前記接続部材の一端側を前記風船保持板に取り付けた状態で、前記送風孔を経て前記袋体に至る圧縮空気の通路が設けられていることを特徴とする上記１.〜５.のいずれかに記載の工業炉の熱風本管補修用遮蔽プラグ。
７. 前記接続部材の他端が前記シール板を保持するシール保持板を貫通して管軸方向に延在され、その他端部に吊り具側フランジとの結合兼・切り離し用フランジが取り付けされていることを特徴とする上記１.〜６.のいずれかに記載の工業炉の熱風本管補修用遮蔽プラグ。 6. The connection member is a tubular blower tube, a blower hole is formed in a central portion of a balloon holding plate that holds the bag, and one end side of the connection member is attached to the balloon holding plate, The hot air main pipe repair shielding plug for an industrial furnace as described in any one of 1 to 5 above, wherein a compressed air passage is provided through the blow hole to the bag.
7. The other end of the connecting member passes through the seal holding plate holding the seal plate and extends in the tube axis direction, and the other end is attached with a flange for coupling / separating with the hanger side flange. The shielding plug for hot air main pipe repair of an industrial furnace as described in any one of 1 to 6 above.

８. 上記１.〜７.のいずれかに記載の熱風本管補修用遮蔽プラグを用い、工業炉の熱風本管を部分補修する際、まず前記熱風本管に開口部を形成し、次いで重機を利用して、前記遮蔽プラグを開口部から挿入し、管軸方向所定位置に設置した後に、圧縮空気の通路に圧縮空気を送り、前記袋体を膨らませると共に前記シール板を展開することを特徴とする工業炉の熱風本管補修方法。   8. When partially repairing the hot air main of an industrial furnace using the hot air main repair shielding plug according to any one of 1 to 7 above, an opening is first formed in the hot air main, and then heavy machinery After inserting the shielding plug from the opening and installing it at a predetermined position in the tube axis direction, the compressed air is sent to the compressed air passage to inflate the bag body and expand the seal plate. A hot air main repair method for industrial furnaces.

本発明によれば、熱風本管の一部を部分補修する際に、従来以上に高温状態にある熱風本管からの輻射熱を効果的に防ぐことができる熱遮蔽壁とすることができると共に、その設置と撤去が容易かつ迅速に行える。このため、熱風本管の送風を停止した後、熱風本管の一部を部分補修する工事を安全にかつ短時間で行え、送風停止時間を短くして送風を再開することができる。   According to the present invention, when partially repairing a part of the hot air main, it can be a heat shielding wall that can effectively prevent radiant heat from the hot air main that is in a higher temperature than before, Its installation and removal can be done easily and quickly. For this reason, after stopping the blowing of the hot air main, the work of partially repairing the hot air main can be performed safely and in a short time, and the blowing can be resumed by shortening the blowing stop time.

以下、熱風炉の熱風本管補修用遮蔽プラグ（単に遮蔽プラグともいう）およびその熱風本管補修方法について図を用い、詳細に説明する。
図１は、本発明例の遮蔽プラグの構造を示す断面図であり、図２は、本発明例の遮蔽プラグにおける袋体１の取り付け方を示す断面図である。また図３は、図１，図２に示した本発明例の遮蔽プラグの組み立て方を示す斜視図である。 Hereinafter, a hot air main repair shielding plug (also simply referred to as a shield plug) of a hot air furnace and a hot air main repair method thereof will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing a structure of a shielding plug according to an example of the present invention, and FIG. 2 is a cross-sectional view illustrating how the bag body 1 is attached to the shielding plug according to the present invention. FIG. 3 is a perspective view showing how to assemble the shielding plug of the example of the present invention shown in FIGS.

この一例の遮蔽プラグは、高炉に付帯する熱風炉の熱風本管の一部を部分補修する工事に用いられる。すなわち、図１に示したように、熱風本管の一部Ｗを部分補修する際、補修箇所１０の近くに設置した遮蔽プラグでもって、従来以上に高温状態にある熱風本管側（図中、管内側）から放射される輻射熱と、管内側から噴出する熱風を遮蔽する熱遮蔽壁を形成する。   The shielding plug of this example is used for construction for partially repairing a part of a hot air main of a hot blast furnace attached to a blast furnace. That is, as shown in FIG. 1, when partially repairing a part W of the hot air main, the hot air main side (in the drawing), which has a shield plug installed near the repair location 10 and is in a higher temperature state than in the past. And a heat shielding wall that shields radiant heat radiated from the inside of the tube and hot air ejected from the inside of the tube.

一例の熱風炉の遮蔽プラグは、第１の熱遮蔽部として、耐熱クロスを縫製してなる袋体１を外周に取り付けた風船保持板２と、風船保持板２内に袋体１を圧縮空気で膨らませるための空気通路用スペーサー２Ａとを具備すると共に、第２の熱遮蔽部として、展開可能なシール板４を外周に取り付けたシール保持板３と断熱材３Ａとを具備している。上記の空気通路用スペーサー２Ａ、断熱材３Ａはそれぞれ、風船保持板２、シール保持板３の管内側の面に取り付けされている。空気通路用スペーサー２Ａは耐熱クロスを複数層重ねた中に形成された空間であり、断熱材３Ａとしてはワイヤードブランケットなどが好適に用いられる。   An example of a hot stove shielding plug includes a balloon holding plate 2 having a bag body 1 formed by sewing a heat-resistant cloth as a first heat shielding portion, and a compressed air that compresses the bag body 1 in the balloon holding plate 2. The air passage spacer 2A for inflating at the same time is provided, and the seal holding plate 3 and the heat insulating material 3A each having a deployable seal plate 4 attached to the outer periphery are provided as a second heat shielding portion. The air passage spacer 2A and the heat insulating material 3A are attached to the inner surfaces of the balloon holding plate 2 and the seal holding plate 3, respectively. The air passage spacer 2A is a space formed by stacking a plurality of heat resistant cloths, and a wired blanket or the like is suitably used as the heat insulating material 3A.

さらにこの遮蔽プラグは、第１、第２の熱遮蔽部を管内側からこの順に管軸方向に近接配置した状態で接続してなる接続部材５と、第１の熱遮蔽部の袋体１を圧縮空気で膨らませる圧縮空気の通路を断熱材内に空気通路用スペーサーとして具備し、接続部材５を介して吊り上げ可能に構成されてなる。接続部材５を介して吊り上げ可能とするため、接続部材５の開口側端、すなわちシール保持板３を貫通して延在した他端部には、図１に示したように、遮蔽プラグの設置時、撤去時に吊り具８と結合する結合兼・切り離し用フランジ７を設けている。   Furthermore, this shielding plug includes a connecting member 5 formed by connecting the first and second heat shielding portions in the tube axis direction in this order from the inside of the tube, and the bag body 1 of the first heat shielding portion. A compressed air passage that is inflated with compressed air is provided as a spacer for the air passage in the heat insulating material, and can be lifted through the connecting member 5. In order to be able to be lifted through the connecting member 5, an opening side end of the connecting member 5, that is, the other end extending through the seal holding plate 3 is provided with a shielding plug as shown in FIG. At the time of removal, there is provided a coupling / separation flange 7 that is coupled to the hanger 8.

ここで、管内側寄りに配置される第１の熱遮蔽部は、第２の熱遮蔽部よりも強い輻射熱と熱風に曝される。このため、耐熱クロスを縫製してなる袋体１と、耐熱クロスを複数層重ねてなる風船保持板２が使用されている。袋体１は、図２（ａ）に示したように、耐熱クロスを複数層として重ねた中に形成された空気通路用スペーサー２Ａと一緒にフラットバー２Ｃを介して風船保持板２の外周寄りに位置するボルト・ナット１１で取り付けされている。１２は座金を示す。第１、第２の熱遮蔽部の部材である風船保持板２、シール保持板３には耐熱性に優れるステンレス製（ＳＵＳ ３０４）の円板状金物が用いられる。袋体１を構成する耐熱クロスは、風船保持板２の外周でボルト・ナット１１により取付けられるが、強い輻射熱と熱風に曝されるため、管内側寄り耐熱クロスは一体物とされた耐熱クロス２Ａ’で構成される。   Here, the 1st heat shielding part arrange | positioned near a pipe inner side is exposed to a radiant heat and hot air stronger than a 2nd heat shielding part. For this reason, a bag body 1 formed by sewing heat-resistant cloth and a balloon holding plate 2 formed by stacking a plurality of heat-resistant cloth layers are used. As shown in FIG. 2 (a), the bag body 1 is close to the outer periphery of the balloon holding plate 2 through the flat bar 2C together with the air passage spacer 2A formed by stacking the heat-resistant cloth as a plurality of layers. It is attached with bolts and nuts 11 located at Reference numeral 12 denotes a washer. For the balloon holding plate 2 and the seal holding plate 3 which are members of the first and second heat shielding parts, stainless steel (SUS 304) disk-shaped hardware having excellent heat resistance is used. The heat-resistant cloth constituting the bag body 1 is attached to the outer periphery of the balloon holding plate 2 by bolts and nuts 11, but is exposed to strong radiant heat and hot air. It consists of '.

また展開可能なシール板４を外周に取り付けたシール保持板３と、断熱材３Ａとを具備している第２の熱遮蔽部の機能は、（１）管内側からの輻射熱と熱風が開口側にまで達するのを、第１の熱遮蔽部と合わせて防ぐこと、（２）第１の熱遮蔽部が管内側あるいは開口側に倒れてしまうのを、接続部材５と接続することで防ぐことである。
このような遮蔽プラグによれば、従来以上に高温状態にある熱風本管から放射される輻射熱と、何らかの理由によって管内側から噴出す熱風を効果的に防ぐことができる熱遮蔽壁とすることができる。なお２Ｂ、３Ｂは、それぞれ開口側の面に設けた補強板を示す。 Further, the function of the second heat shield part including the seal holding plate 3 having the deployable seal plate 4 attached to the outer periphery and the heat insulating material 3A is as follows. (1) Radiation heat and hot air from the inside of the tube are open side (2) Preventing the first heat shield from falling to the inside or the opening side of the tube by connecting to the connecting member 5. It is.
According to such a shielding plug, it is possible to provide a heat shielding wall that can effectively prevent radiant heat radiated from a hot air main pipe that is in a higher temperature than before and hot air blown from the inside of the pipe for some reason. it can. In addition, 2B and 3B show the reinforcement board provided in the surface by the side of an opening, respectively.

第１の熱遮蔽部に設けた袋体１を圧縮空気で膨らます圧縮空気の通路は後述するが、図１に示したように、フレキシブルホース６に接続したエアー導入管５Ａから、接続部材５を兼ねる管状の送風管の一端側開口部５Ｂを経、袋体１に至るように形成されている。
なお第１の熱遮蔽部に設けた袋体１は、複数の環状部分同士を補強テープで繋ぎ合わして構成してなるのが、丈夫な環状の断熱風船とすることができるので好ましい。また第２の熱遮蔽部に設けたシール板４の構造は、シール板４を例えば厚みが０.１ｍｍのステンレス製の薄板とし、図１、図２（ｂ）に示したように、シール板４がその厚みよりも厚いフラットバーに固定したスプリング付蝶番４Ｂを介して取り付けされているのが、展開構造を簡単にできるので好ましい。そのうえさらにスプリング付蝶番４Ｂを固定してなるフラットバーの中央には、一方向に延在するワイヤー取付板４Ａの一端が固定され、かつワイヤー取付板４Ａの他端にワイヤー取付孔が形成されてなるのが、遮蔽プラグの設置時、およびその撤去時、ワイヤー取付板４Ａに取り付けたワイヤー９を引っ張り、シール板４を容易かつ迅速に取り込めるのでより好ましい。 The compressed air passage for inflating the bag body 1 provided in the first heat shield part with compressed air will be described later. As shown in FIG. 1, the connecting member 5 is connected from the air introduction pipe 5A connected to the flexible hose 6. It is formed so as to reach the bag body 1 through the one end side opening 5B of the tubular blower tube that also serves as the tube.
In addition, since the bag body 1 provided in the 1st heat-shielding part can be made into a strong cyclic | annular heat insulation balloon, it is preferable to comprise a some cyclic | annular part connected with a reinforcement tape, and it is preferable. Also, the structure of the seal plate 4 provided in the second heat shield portion is such that the seal plate 4 is a thin plate made of stainless steel having a thickness of 0.1 mm, for example, as shown in FIGS. 1 and 2B. It is preferable that 4 is attached via a hinge 4B with a spring fixed to a flat bar thicker than the thickness, because the unfolded structure can be simplified. In addition, one end of a wire mounting plate 4A extending in one direction is fixed to the center of the flat bar formed by further fixing the hinge 4B with a spring, and a wire mounting hole is formed at the other end of the wire mounting plate 4A. It is more preferable that the wire 9 attached to the wire attachment plate 4A is pulled and the seal plate 4 can be taken in easily and quickly when the shielding plug is installed and removed.

次いで遮蔽プラグに設けた、袋体１を圧縮空気で膨らます圧縮空気の通路について、図１、図２（ａ）及び図３を参照しつつ説明する。圧縮空気の通路は、フレキシブルホース６に接続したエアー導入管５Ａから、接続部材５を兼ねる管状の送風管の一端側開口部５Ｂを経、袋体１に至るように形成されている。
ここで、袋体１を保持する風船保持板２の中央部には、図２（ａ）及び図３に示したように、送風孔が形成され、接続部材５の一端側を風船保持板２に取り付けた状態で、送風孔を経て袋体１に至る圧縮空気の通路が設けられている。風船保持板２の中央部の送風孔から袋体１に至る圧縮空気の通路を形成する空気通路用スペーサー２Ａは、耐熱クロスを複数層重ねてなる部分に間際を発生させて形成された袋体１に至る開口部と、耐熱クロス２Ａ’と接続部材との空間で、風船保持板２内間に形成されている。このような圧縮空気の通路を遮蔽プラグに設けるのがそれを別体に設ける必要がないので好ましい。 Next, a compressed air passage provided on the shielding plug for inflating the bag 1 with compressed air will be described with reference to FIGS. 1, 2 (a), and 3. The compressed air passage is formed so as to reach the bag body 1 from the air introduction pipe 5 </ b> A connected to the flexible hose 6 through the one end side opening 5 </ b> B of the tubular blower pipe that also serves as the connection member 5.
Here, as shown in FIGS. 2A and 3, an air blowing hole is formed in the central portion of the balloon holding plate 2 that holds the bag body 1, and one end side of the connection member 5 is connected to the balloon holding plate 2. In the state where it was attached to, the passage of the compressed air which leads to the bag body 1 through a ventilation hole is provided. The air passage spacer 2A for forming a compressed air passage extending from the air blowing hole in the central portion of the balloon holding plate 2 to the bag body 1 is formed by causing the heat-resistant cloth to overlap the portion formed by overlapping the heat-resistant cloth. 1, the space between the heat-resistant cloth 2 </ b> A ′ and the connecting member is formed between the balloon holding plates 2. It is preferable to provide such a passage for compressed air in the shielding plug because it is not necessary to provide it separately.

さらに接続部材５の他端がシール板４を保持するシール保持板３を貫通して管軸方向に延在され、その他端部に吊り具側フランジとの結合兼・切り離し用フランジ７が取り付けされていることが、遮蔽プラグの設置時、およびその撤去時、重機を利用して遮蔽プラグと吊り具８との着脱を容易かつ迅速に行えるので好ましい。
次いで以上説明した一例の遮蔽プラグを用い、熱風炉の熱風本管を部分補修する熱風本管補修用方法について説明する。図４には、重機を利用して一例の遮蔽プラグを吊り具８を介して吊り上げた状態を示し、図５には、その後、熱風本管に形成した開口部から、遮蔽プラグを熱風本管の一部Ｗの補修箇所１０の近くに挿入した状態を示した。 Further, the other end of the connecting member 5 penetrates the seal holding plate 3 holding the seal plate 4 and extends in the tube axis direction, and a flange 7 for coupling / separating with the hanger side flange is attached to the other end. It is preferable that the shield plug and the lifting tool 8 can be attached and detached easily and quickly using a heavy machine when the shield plug is installed and removed.
Next, a hot air main repair method for partially repairing a hot air main of a hot stove using the above-described example of the shielding plug will be described. FIG. 4 shows a state in which an example of a shielding plug is lifted through a lifting tool 8 using a heavy machine, and FIG. 5 shows that the shielding plug is subsequently connected to the hot air main through an opening formed in the hot air main. The state where it inserted in the vicinity of the repair location 10 of a part W of was shown.

本発明にかかる熱風本管補修用方法は、まず熱風本管に開口部を形成し、次いで重機を利用して遮蔽プラグを開口部から挿入し、管軸方向所定位置に設置した後に、圧縮空気の通路に圧縮空気を送り、袋体１を膨らませると共にシール板４を展開させ、熱遮蔽壁とする。したがって本発明例の遮蔽プラグを用い、熱風本管を部分補修する熱風炉の熱風本管補修用方法によれば、熱風本管の一部Ｗの補修箇所１０の近くに、十分長い設置スペースがない場合でも、管内側からの輻射熱と熱風を効果的に防ぐことができる熱遮蔽壁の設置と撤去が容易かつ迅速に行える。   In the hot air main pipe repair method according to the present invention, first, an opening is formed in the hot air main, a shielding plug is inserted from the opening using a heavy machine, and the compressed air is installed at a predetermined position in the pipe axis direction. Compressed air is sent to this passage to inflate the bag body 1 and expand the seal plate 4 to form a heat shielding wall. Therefore, according to the hot air main pipe repair method for a hot air main furnace in which the hot air main pipe is partially repaired using the shielding plug of the present invention, a sufficiently long installation space is provided near the repaired portion 10 of the part W of the hot air main pipe. Even in the absence, the heat shielding wall that can effectively prevent radiant heat and hot air from the inside of the tube can be installed and removed easily and quickly.

高炉に付帯する熱風炉の熱風本管を部分補修する工事に本発明を適用した。図６は、４基の熱風炉を配置した熱風本管Ｗ１を示す平面図である。補修工事の対象は、Ｎｏ.１熱風炉１３からの熱風を熱風本管Ｗ１へ供給するための熱風本管の一部Ｗで、損傷したレンガ壁である。図６中、１４は混冷室、Ｗ２は、各熱風炉１３に接続される熱風支管を示す。   The present invention was applied to a construction for partially repairing a hot air main of a hot stove attached to a blast furnace. FIG. 6 is a plan view showing a hot air main pipe W1 in which four hot stove furnaces are arranged. The object of the repair work is a damaged brick wall with a part W of the hot air main for supplying hot air from the No. 1 hot air furnace 13 to the hot air main W1. In FIG. 6, 14 is a mixed cooling chamber, and W <b> 2 is a hot air branch pipe connected to each hot air furnace 13.

そこで従来以上に早期に補修工事を開始し、短時間で補修工事を完了する工事スケジュールにしたがい、熱風本管Ｗ１の送風を停止した後、以下の仕様の遮蔽プラグにて、レンガ壁の内径が１７７０ｍｍの熱風本管の部分Ｗを塞いで熱遮蔽壁とし、損傷したレンガ壁を補修する工事を行った。その結果、熱風本管の送風を停止した後、熱風本管の一部を部分補修する工事を安全にかつ短時間で行え、送風停止時間を短くして送風を再開することができた。   Therefore, according to the construction schedule that starts repair work earlier than before and completes the repair work in a short time, after stopping the blowing of hot air main W1, the inner diameter of the brick wall is reduced by the shielding plug of the following specifications Construction was performed to repair the damaged brick wall by closing the 1770 mm hot air main portion W to form a heat shielding wall. As a result, after stopping the blowing of the hot air main, the work for partially repairing the hot air main could be performed safely and in a short time, and the blowing could be resumed by shortening the blowing stop time.

（遮蔽プラグの仕様）
〔第１の熱遮蔽部について〕
袋体１を構成する耐熱クロス：朱子織りのシリカクロス（ＨＩＴＯＣＯ社製 ＲＥＦＲＡＳＩＬ Ｃ１００−４８：厚み０．６６ｍｍ）を３枚積層し、さらにその上に平織りのアルミナクロス（３Ｍ社製 ＮＥＸＴＥＬ＃１４：厚み０．３６ｍｍ）を１枚重ねてなる４層構造。 風船保持板２の管内側の面に取り付けた断熱材２Ａ：袋体１を構成する耐熱クロスと同じもの。袋体１を管外で圧縮空気で膨らませたときの環状の断熱風船の直径≒３００ｍｍ。 (Specification of shielding plug)
[About the first heat shield]
Heat-resistant cloth constituting the bag body 1: Three sheets of satin-woven silica cloth (REFRASIL C100-48 manufactured by HITOCO: thickness 0.66 mm) are laminated, and a plain weave alumina cloth (NEXTEL # 14 manufactured by 3M) is further formed thereon. A four-layer structure in which one sheet of 0.36 mm thick is stacked. Heat insulating material 2A attached to the inner surface of the balloon holding plate 2: the same heat resistant cloth as the bag 1 The diameter of the annular insulated balloon when the bag 1 is inflated with compressed air outside the tube is approximately 300 mm.

風船保持板２の材質 ＳＵＳ ３０４、その外径＝１３００ｍｍ、その厚み＝５ｍｍ、それに設けた送風孔の直径＝５０ｍｍ。
〔第２の熱遮蔽部について〕
シール保持板３の管内側の面に取り付けた断熱材３Ａ：厚み２５〜5０ｍｍのワイヤードブランケット。シール保持板３の材質 ＳＵＳ ３０４、その外径＝１２７０ｍｍ（半径＝６３５ｍｍの半円形板の組合わせ）、その厚み＝３ｍｍ。シール板４の材質 ＳＵＳ ３０４、その厚み＝０.１ｍｍ、展開可能なシール板４を管外でそれを展開したときのシール板の外縁までの直径＝１８７０ｍｍ。 The material of the balloon holding plate 2 is SUS 304, its outer diameter = 1300 mm, its thickness = 5 mm, and the diameter of the air holes provided in it = 50 mm.
[About the second heat shield]
Heat insulating material 3A attached to the inner surface of the seal holding plate 3: a wired blanket with a thickness of 25 to 50 mm. Material of the seal holding plate 3 SUS 304, its outer diameter = 1270 mm (combination of semicircular plates having a radius = 635 mm), its thickness = 3 mm. The material of the seal plate 4 is SUS 304, the thickness is 0.1 mm, and the diameter up to the outer edge of the seal plate when the deployable seal plate 4 is deployed outside the pipe is 1870 mm.

〔接続部材について〕
接続部材５の材質 ＳＵＳ ３０４、その管軸方向長さ＝５５０ｍｍ。
この遮蔽プラグの管軸方向長さを、環状の断熱風船の直径の半分（１５０ｍｍ）と、接続部材５の管軸方向長さ（５５０ｍｍ）の和とすると略７００ｍｍとなる。一方、図７に示した特許文献１記載の補修用熱遮蔽装置は、レンガ壁の内径が同じ程度の熱風本管の部分Ｗを補修する際、外径が２ｍのほぼ球形の熱遮蔽壁としている。このことから、本発明例の遮蔽プラグは、管軸方向長さを従来よりも短くできる、輻射熱の遮蔽効果に優れる熱遮蔽壁である。 [About connecting members]
The material of the connecting member 5 is SUS 304, and its length in the tube axis direction = 550 mm.
When the length of the shielding plug in the tube axis direction is the sum of the half of the diameter of the annular heat insulating balloon (150 mm) and the length of the connection member 5 in the tube axis direction (550 mm), the length is approximately 700 mm. On the other hand, the repairing heat shield device described in Patent Document 1 shown in FIG. 7 is a substantially spherical heat shield wall having an outer diameter of 2 m when repairing the hot air main portion W having the same inner diameter of the brick wall. Yes. From this, the shielding plug of the example of the present invention is a heat shielding wall that can shorten the length in the tube axis direction as compared with the conventional one and is excellent in the shielding effect of radiant heat.

本発明例の遮蔽プラグの構造を示す断面図である。It is sectional drawing which shows the structure of the shielding plug of the example of this invention. 本発明例の遮蔽プラグにおける袋体の取り付け方を示す断面図である。It is sectional drawing which shows the attachment method of the bag body in the shielding plug of the example of this invention. 本発明例の遮蔽プラグの組み立て方を示す斜視図である。It is a perspective view which shows the assembly method of the shielding plug of the example of this invention. 本発明例の遮蔽プラグを用い、熱風炉の熱風本管補修方法を示す側面図である。It is a side view which shows the hot air main pipe repair method of a hot stove using the shielding plug of the example of the present invention. 本発明例の遮蔽プラグを用いた熱風炉の熱風本管補修方法の手順を示す他の断面図である。It is another sectional drawing which shows the procedure of the hot-air main pipe repair method of a hot-blast furnace using the shielding plug of the example of this invention. 本発明を適用して好適な熱風炉の熱風本管の補修箇所を示す平面図である。It is a top view which shows the repair location of the hot air main of the hot stove suitable to which this invention is applied. 従来の熱遮蔽壁の問題点を説明する断面図である。It is sectional drawing explaining the problem of the conventional heat shielding wall.

符号の説明Explanation of symbols

１ 袋体
２ 風船保持板
２Ａ 空気通路用スペーサー
２A’ 耐熱クロス
２Ｂ 補強部材
２Ｃ フッラトバ−
３ シール保持板
３Ａ 断熱材（ワイヤードブランケット）
３Ｂ 補強部材
４ シール板
４Ａ ワイヤー取付板
４Ｂ スプリング付蝶番
５ 接続部材（送風管）
５Ａ エアー導入管
５Ｂ 送風管の一端側開口部
６ フレキシブルホース
７ 結合兼・切り離し用フランジ
８ 吊り具
９ ワイヤー
１０ 補修箇所
１１ ボルト・ナット
１２ 座金
１３ 熱風炉
１４ 混冷室
１５ 熱風弁
２０ 従来の熱遮蔽壁
２０Ａ ホース
２０Ｂ 流量計、圧力形付バルブスタンド
２０Ｃ コンプレッサ
２１ 補修箇所
Ｗ 熱風本管の一部
Ｗ１ 熱風本管
Ｗ２ 熱風支管 DESCRIPTION OF SYMBOLS 1 Bag body 2 Balloon holding plate 2A Air passage spacer 2A 'Heat resistant cloth 2B Reinforcement member 2C Flat bar
3 Seal retaining plate 3A Insulation (wired blanket)
3B Reinforcement member 4 Seal plate 4A Wire mounting plate 4B Hinge with spring 5 Connection member (air blower tube)
5A Air introduction pipe 5B Opening one end side of the blow pipe 6 Flexible hose 7 Flange for coupling and disconnection 8 Lifting tool 9 Wire 10 Repair location 11 Bolt / Nut 12 Washer 13 Hot air furnace 14 Mixed cooling chamber 15 Hot air valve 20 Conventional heat Shielding wall 20A Hose 20B Flow meter, Pressure stand valve stand 20C Compressor 21 Repair location W Part of hot air main W1 Hot air main W2 Hot air branch

Claims (8)

工業炉の熱風本管を部分補修する工事に用いる熱風本管補修用遮蔽プラグであって、
耐熱クロスを縫製してなる袋体を外周に設けた第１の熱遮蔽部と、展開可能なシール板を外周に設けた第２の熱遮蔽部と、第１、第２の熱遮蔽部を管内側からこの順に管軸方向に近接配置した状態で接続してなる接続部材と、前記袋体を圧縮空気で膨らませる圧縮空気の通路を具備し、前記接続部材を介して吊り上げ可能に構成されてなることを特徴とする工業炉の熱風本管補修用遮蔽プラグ。 A shield plug for hot air main repair used for construction to partially repair the hot air main of an industrial furnace,
A first heat shield portion provided with a bag body formed by sewing a heat-resistant cloth on the outer periphery; a second heat shield portion provided with an expandable seal plate on the outer periphery; and the first and second heat shield portions. A connecting member connected in the state of being arranged close to the tube axis in this order from the inside of the tube, and a compressed air passage for inflating the bag body with compressed air, are configured to be able to be lifted through the connecting member. A shielding plug for repairing hot air mains in industrial furnaces. 前記熱遮蔽部がそれぞれ、前記袋体あるいは前記シール板を保持する保持板と、その管内側の面に取り付けてなる断熱材とを有することを特徴とする請求項１に記載の工業炉の熱風本管補修用遮蔽プラグ。   The hot air of an industrial furnace according to claim 1, wherein each of the heat shield portions includes a holding plate for holding the bag body or the seal plate, and a heat insulating material attached to a surface inside the tube. Shield plug for main pipe repair. 前記袋体は、複数の環状部分同士を補強テープで繋ぎ合わして構成されていることを特徴とする請求項１又は２に記載の工業炉の熱風本管補修用遮蔽プラグ。   3. The shield plug for hot air main pipe repair of an industrial furnace according to claim 1 or 2, wherein the bag body is formed by connecting a plurality of annular portions with a reinforcing tape. 前記シール板がその厚みよりも厚いフラットバーに固定したスプリング付蝶番を介して展開する構造を有することを特徴とする請求項１〜３のいずれかに記載の工業炉の熱風本管補修用遮蔽プラグ。   The shield for hot air main pipe repair of an industrial furnace according to any one of claims 1 to 3, wherein the seal plate has a structure that expands through a hinge with a spring fixed to a flat bar that is thicker than its thickness. plug. 前記スプリング付蝶番を固定してなるフラットバーの中央には、一方向に延在するワイヤー取付板の一端が固定され、かつその他端にワイヤー取付孔が形成されていることを特徴とする請求項４に記載の工業炉の熱風本管補修用遮蔽プラグ。   The center of the flat bar formed by fixing the hinge with spring is fixed at one end of a wire mounting plate extending in one direction and formed with a wire mounting hole at the other end. 4. A shielding plug for repairing hot air mains of an industrial furnace according to 4. 前記接続部材が管状の送風管とされ、前記袋体を保持する風船保持板の中央部に送風孔が形成され、前記接続部材の一端側を前記風船保持板に取り付けた状態で、前記送風孔を経て前記袋体に至る圧縮空気の通路が設けられていることを特徴とする請求項１〜５のいずれかに記載の工業炉の熱風本管補修用遮蔽プラグ。   The connection member is a tubular blower tube, a blower hole is formed in a central portion of a balloon holding plate that holds the bag body, and one end side of the connection member is attached to the balloon holding plate. A hot air main pipe repairing shielding plug for an industrial furnace according to any one of claims 1 to 5, wherein a passage of compressed air is provided to reach the bag body through the above. 前記接続部材の他端が前記シール板を保持するシール保持板を貫通して管軸方向に延在され、その他端部に吊り具側フランジとの結合兼・切り離し用フランジが取り付けされていることを特徴とする請求項１〜６のいずれかに記載の工業炉の熱風本管補修用遮蔽プラグ。   The other end of the connecting member passes through the seal holding plate that holds the seal plate and extends in the tube axis direction, and the other end portion is attached with a flange for coupling / disconnecting with a lifting device side flange. A shielding plug for hot air main pipe repair of an industrial furnace according to any one of claims 1 to 6. 請求項１〜７のいずれかに記載の熱風本管補修用遮蔽プラグを用い、工業炉の熱風本管を部分補修する際、まず前記熱風本管に開口部を形成し、次いで重機を利用して、前記遮蔽プラグを開口部から挿入し、管軸方向所定位置に設置した後に、圧縮空気の通路に圧縮空気を送り、前記袋体を膨らませると共に前記シール板を展開することを特徴とする工業炉の熱風本管補修方法。   When partially repairing a hot air main pipe of an industrial furnace using the hot air main pipe repair shielding plug according to any one of claims 1 to 7, an opening is first formed in the hot air main pipe, and then a heavy machine is used. The shielding plug is inserted from the opening and installed at a predetermined position in the tube axis direction, and then the compressed air is sent to the passage of compressed air to inflate the bag body and unfold the seal plate. Hot air main repair method for industrial furnaces.
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