JP5096822B2 - Thermal expansion absorption structure of waste melting furnace - Google Patents

Thermal expansion absorption structure of waste melting furnace Download PDF

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JP5096822B2
JP5096822B2 JP2007190454A JP2007190454A JP5096822B2 JP 5096822 B2 JP5096822 B2 JP 5096822B2 JP 2007190454 A JP2007190454 A JP 2007190454A JP 2007190454 A JP2007190454 A JP 2007190454A JP 5096822 B2 JP5096822 B2 JP 5096822B2
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melting furnace
waste
expansion
thermal expansion
charging device
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JP2009024966A (en
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光正 戸高
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Nippon Steel Engineering Co Ltd
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Description

本発明は、都市ごみ、産業廃棄物などの廃棄物を溶融処理する廃棄物溶融炉において、溶融炉本体の熱膨張を吸収する構造に関する。 The present invention, municipal waste, in waste melting furnace for melting processes waste such as industrial waste, relates to a structure for absorbing thermal expansion of the melting furnace main body.

都市ごみ、産業廃棄物などの廃棄物を廃棄物溶融炉で溶融処理することが知られている。この廃棄物溶融炉においては、溶融炉本体の上部に廃棄物装入装置が接続されており、廃棄物装入装置から装入された廃棄物は溶融炉本体内を下降する過程で、順次、予熱、乾燥、熱分解され、炉底部で溶融される。   It is known that waste such as municipal waste and industrial waste is melted in a waste melting furnace. In this waste melting furnace, a waste charging device is connected to the upper part of the melting furnace main body, and the waste charged from the waste charging device is in the process of descending in the melting furnace main body, Preheated, dried, pyrolyzed and melted at the bottom of the furnace.

従来、廃棄物装入装置としては、特許文献１、２等に記載されているような上下２重シール式の廃棄物装入装置を使用し、廃棄物装入時に溶融炉本体内のガスが外部へ吹き出すことを防止している。   Conventionally, as a waste charging device, an upper and lower double seal type waste charging device as described in Patent Documents 1 and 2, etc. is used, and the gas in the melting furnace main body is Prevents blowout to the outside.

図３は、上下２重シール式の廃棄物装入装置を備えた従来の廃棄物溶融炉を示す。上下２重シール式の廃棄物装入装置３は、上シール弁３ａと下シール弁３ｂとこれらの間に挟まれた中間ホッパー３ｃとを備える。装入される廃棄物は、溶融炉本体１内のガスの外部への吹き出しを防止するため、下シール弁３ｂを閉めた状態で上シール弁３ａを開けて、装入ホッパー４から投入され、一旦、中間ホッパー３ｃに貯留される。その後、上シール弁３ａを閉めてから下シール弁３ｂを開け、廃棄物を溶融炉本体１内に装入する。   FIG. 3 shows a conventional waste melting furnace equipped with an upper and lower double seal type waste charging apparatus. The upper and lower double seal type waste charging device 3 includes an upper seal valve 3a, a lower seal valve 3b, and an intermediate hopper 3c sandwiched between them. The waste to be charged is introduced from the charging hopper 4 by opening the upper seal valve 3a with the lower seal valve 3b closed in order to prevent the gas in the melting furnace body 1 from blowing out to the outside. Once stored in the intermediate hopper 3c. Thereafter, the upper seal valve 3 a is closed and then the lower seal valve 3 b is opened, and the waste is charged into the melting furnace body 1.

この上下２重シール式の廃棄物装入装置３は、高さ、重量とも大きくなるため、溶融炉本体１で支持することは困難であり、建築構造物で支持されている。すなわち、溶融炉本体１は支持部Ａ、廃棄物装入装置３は下シール弁ケーシング３ｄを支持部Ｂ、中間ポッパー３ｃを支持部Ｃで建築構造物に支持されている。   Since the upper and lower double-seal type waste charging device 3 is large in both height and weight, it is difficult to support the melting furnace main body 1 and is supported by a building structure. That is, the melting furnace main body 1 is supported by the building structure, and the waste charging device 3 is supported by the building structure by the lower seal valve casing 3d by the support B and the intermediate popper 3c by the support C.

このような支持方式では、溶融炉本体１の支持部Ａより上方の鉄皮の熱膨張を吸収するため、溶融炉本体１の上端と下部シール弁ケーシング３ｄとの間に長さ５００ｍｍ程度の伸縮管２が設けられる。この伸縮管２は、溶融炉本体１内の高温ガス（３００〜１０００℃程度）に晒されるため、図４に示すように、耐火物２ａを内張りし、伸縮管２の熱的保護を行っている。   In such a support system, in order to absorb the thermal expansion of the iron shell above the support portion A of the melting furnace body 1, the expansion and contraction of about 500 mm in length is provided between the upper end of the melting furnace body 1 and the lower seal valve casing 3d. A tube 2 is provided. Since the expansion tube 2 is exposed to the high-temperature gas (about 300 to 1000 ° C.) in the melting furnace body 1, as shown in FIG. 4, a refractory 2 a is lined and the expansion tube 2 is thermally protected. Yes.

しかし、図３に示す伸縮管２の存在は、その必要な高さ分、廃棄物溶融炉全体の高さを増加させ、この廃棄物溶融炉を収容している建築物の高さを高くし、建築コストの増加を招く。   However, the presence of the telescopic tube 2 shown in FIG. 3 increases the height of the entire waste melting furnace by the required height, and raises the height of the building containing the waste melting furnace. Incurs an increase in construction costs.

また、伸縮管２に内張りされた耐火物２ａには、溶融炉本体１の鉄皮の熱膨張を吸収するために膨張代δを設け、この膨張代δ部分にはダスト類の侵入を防ぐために可縮性のセラミックウール２ｂ等が充填されているが、廃棄物溶融炉の運転中に、膨張代δ部分のセラミックウール２ｂ内にダスト類が侵入し、さらに、廃棄物溶融炉の停止、運転の繰り返しに伴い、ダスト類を含むセラミックウール層２ｂは溶融炉本体１内の高温ガスの影響により硬化し、さらにダスト類の侵入を招く。このため膨張代δ部分は短期間でダスト類によって置換され、ついには膨張代δ部分のセラミックウール層２ｂが伸縮機能を失うという問題が生じる。   In addition, the refractory 2a lined on the expansion tube 2 is provided with an expansion allowance δ for absorbing the thermal expansion of the iron skin of the melting furnace main body 1, and in order to prevent the invasion of dusts into this expansion allowance δ portion. Although it is filled with compressible ceramic wool 2b etc., during operation of the waste melting furnace, dust enters the ceramic wool 2b in the expansion allowance δ part, and further, the waste melting furnace is stopped and operated. With the repetition of the above, the ceramic wool layer 2b containing dust hardens due to the influence of the high-temperature gas in the melting furnace main body 1 and further intrudes dust. For this reason, the expansion allowance δ portion is replaced with dusts in a short period of time, and finally there arises a problem that the ceramic wool layer 2b in the expansion allowance δ portion loses its expansion and contraction function.

膨張代δ部分のセラミックウール層が伸縮機能を失った状態では、溶融炉本体１の鉄皮の熱膨張を同部分で吸収できなくなるため、溶融炉本体１の鉄皮や下シール弁ケーシング３ｄの変形を招くことになる。この変形は、内張耐火物の脱落につながり、鉄皮の温度が上昇し、熱膨張による変形を進行させるという悪循環に陥る。
特開平１０−１８５１４５号公報 特開２００４−１９７９８０号公報 In a state where the ceramic wool layer in the expansion allowance δ portion loses the expansion and contraction function, the thermal expansion of the iron core of the melting furnace body 1 cannot be absorbed by the same portion, so the iron skin of the melting furnace main body 1 and the lower seal valve casing 3d This will cause deformation. This deformation leads to the falling of the lining refractory, and the temperature of the iron skin rises, resulting in a vicious circle in which the deformation due to thermal expansion proceeds.
Japanese Patent Laid-Open No. 10-185145 JP 2004-197980 A

本発明が解決しようとする課題は、従来、溶融炉本体の鉄皮の熱膨張を吸収するために溶融炉本体上端部に設けられていた伸縮管が抱える上記の諸問題を解消することにあり、具体的には、廃棄物溶融炉を収容する建築物の高さを増す必要がなく、溶融炉本体内のダスト類や高温ガスの影響を受けにくい廃棄物溶融炉の熱膨張吸収構造を提供することにある。 The problem to be solved by the present invention is to eliminate the above-mentioned problems of the expansion and contraction tube that has been provided at the upper end of the melting furnace main body in order to absorb the thermal expansion of the core of the melting furnace main body. Specifically, it provides a thermal expansion absorption structure for a waste melting furnace that does not need to increase the height of the building that houses the waste melting furnace and is less susceptible to dust and high-temperature gas in the melting furnace body. There is to do.

本発明の廃棄物溶融炉の熱膨張吸収構造は、溶融炉本体に上下２重シール式の廃棄物装入装置を接続した廃棄物溶融炉において、前記廃棄物装入装置の上シール弁と下シール弁との間の中間ホッパーの直胴部に伸縮管を設け、前記廃棄物溶融炉は、建築構造物の支持部で支持され、さらに、前記廃棄物装入装置の前記伸縮管以下の荷重を前記溶融炉本体で支持して前記溶融炉本体の荷重と併せて前記支持部で支持したことを特徴とするものである。また、前記構成において、前記伸縮管に２個の筒体を嵌め合わせた伸縮可能な構造の保護内筒を設けたことを特徴とする。 The thermal expansion absorption structure for a waste melting furnace according to the present invention is a waste melting furnace in which an upper and lower double-seal type waste charging apparatus is connected to the melting furnace main body. An expansion tube is provided in a straight body portion of the intermediate hopper between the seal valve, the waste melting furnace is supported by a support portion of a building structure, and further, a load equal to or less than the expansion tube of the waste charging device. Is supported by the melting furnace main body and is supported by the support portion together with the load of the melting furnace main body . Moreover, the said structure WHEREIN: The protection inner cylinder of the structure which can be expanded-contracted which fitted two cylinders to the said expansion-contraction pipe | tube was provided.

本発明では、溶融炉本体の熱膨張を吸収するための伸縮管を中間ホッパーに設置し、図３に示した従来の伸縮管２は廃止する。したがって、伸縮管設置のための高さを新たに設ける必要はなく、図３に示した従来の伸縮管２を廃止した高さ分、廃棄物溶融炉全体の高さを減ずることができる。言い換えれば。廃棄物溶融炉及びこれを収容する建築物の高さを増すことなく、溶融炉本体の熱膨張を吸収するための伸縮管を設置することができ、廃棄物溶融炉の建築コストを低減することができる。   In the present invention, an expansion / contraction tube for absorbing the thermal expansion of the melting furnace main body is installed in the intermediate hopper, and the conventional expansion / contraction tube 2 shown in FIG. 3 is eliminated. Therefore, it is not necessary to newly provide a height for installing the expansion tube, and the height of the entire waste melting furnace can be reduced by the height of the conventional expansion tube 2 shown in FIG. In other words. Without increasing the height of the waste melting furnace and the building that accommodates it, it is possible to install an expansion tube to absorb the thermal expansion of the melting furnace body, thereby reducing the construction cost of the waste melting furnace Can do.

また、中間ホッパーに設置した伸縮管は溶融炉本体内のダスト類や高温ガスの影響を直接受けないので、図４に示したような内張りの耐火物２ａやセラミックウール充填された膨張代δは不要となり、膨張代δ部分へのダスト類の堆積、固着に伴う伸縮機能喪失等の問題から解放される。   In addition, since the expansion tube installed in the intermediate hopper is not directly affected by the dust and high-temperature gas in the melting furnace body, the expansion allowance δ filled with the refractory 2a or ceramic wool as shown in FIG. It becomes unnecessary and is freed from problems such as accumulation of dust on the expansion allowance δ, loss of expansion and contraction function due to fixation.

以下、図面に示す実施例に基づき本発明の実施の形態を説明する。   Embodiments of the present invention will be described below based on examples shown in the drawings.

図１は、本発明の廃棄物溶融炉の熱膨張吸収構造の一実施例を示す。同図に示す廃棄物溶融炉おいては、溶融炉本体１の上部に上下２重シール式の廃棄物装入装置３が接続されており、さらにこの廃棄物装入装置３の上部に装入ホッパー４が接続されている。   FIG. 1 shows an embodiment of the thermal expansion absorption structure of the waste melting furnace of the present invention. In the waste melting furnace shown in the figure, an upper and lower double-seal type waste charging apparatus 3 is connected to the upper part of the melting furnace main body 1 and further charged to the upper part of the waste charging apparatus 3. A hopper 4 is connected.

上下２重シール式の廃棄物装入装置３は、上シール弁３ａと下シール弁３ｂとこれらの間に挟まれた中間ホッパー３ｃとを備える。装入される廃棄物は、溶融炉本体１内のガスの外部への吹き出しを防止するため、下シール弁３ｂを閉めた状態で上シール弁３ａを開けて、装入ホッパー４から投入され、一旦、中間ホッパー３ｃに貯留される。その後、上シール弁３ａを閉めてから下シール弁３ｂを開け、廃棄物を溶融炉本体１内に装入する。この廃棄物は溶融炉本体内を下降する過程で、順次、予熱、乾燥、熱分解され、炉底部で溶融される。   The upper and lower double seal type waste charging device 3 includes an upper seal valve 3a, a lower seal valve 3b, and an intermediate hopper 3c sandwiched between them. The waste to be charged is introduced from the charging hopper 4 by opening the upper seal valve 3a with the lower seal valve 3b closed in order to prevent the gas in the melting furnace body 1 from blowing out to the outside. Once stored in the intermediate hopper 3c. Thereafter, the upper seal valve 3 a is closed and then the lower seal valve 3 b is opened, and the waste is charged into the melting furnace body 1. This waste is preheated, dried, pyrolyzed and melted at the bottom of the furnace in the course of descending the melting furnace body.

このような構成において、廃棄物装入装置３の中間ホッパー３ｃの直胴部に、溶融炉本体１の鉄皮の熱膨張を吸収するための伸縮管５を設置している。すなわち、図３に示した従来の伸縮管２は廃止し、中間ホッパー３ｃの直胴部に伸縮管５を設置する。   In such a configuration, the expansion tube 5 for absorbing the thermal expansion of the iron shell of the melting furnace body 1 is installed in the straight body portion of the intermediate hopper 3 c of the waste charging device 3. That is, the conventional telescopic tube 2 shown in FIG. 3 is abolished, and the telescopic tube 5 is installed in the straight body portion of the intermediate hopper 3c.

中間ポッパー３ｃ部分は、下シール弁３ｂによって溶融炉本体１と隔離されるので、溶融炉本体内のダスト類や高温ガスの影響を直接受けることはなく、５０〜１００℃程度の環境である。したがって、中間ポッパー３ｃに設置される伸縮管５には、図４に示したような内張りの耐火物２ａやセラミックウール充填された膨張代δは不要であり、伸縮管５は、図２に示すように、長さ３００〜５００ｍｍ程度の金属ベローズに保護内筒５ａを設けた簡単な構造とすることができる。保護内筒５ａは２個の筒体を嵌め合わせた構造で、伸縮可能となっている。なお、伸縮管５は溶融炉本体内のダスト類や高温ガスの影響を直接受けないので、金属ベローズの代わりにゴムや樹脂などの非金属の材質を使用してもよい。   Since the intermediate popper 3c portion is isolated from the melting furnace main body 1 by the lower seal valve 3b, it is not directly affected by dusts and high-temperature gas in the melting furnace main body, and is an environment of about 50 to 100 ° C. Therefore, the expansion tube 5 installed in the intermediate popper 3c does not need the refractory 2a having a lining as shown in FIG. 4 or the expansion allowance δ filled with ceramic wool, and the expansion tube 5 is shown in FIG. Thus, it can be set as the simple structure which provided the protection inner cylinder 5a in the metal bellows about 300-500 mm in length. The protective inner cylinder 5a has a structure in which two cylinders are fitted together, and can be expanded and contracted. In addition, since the expansion tube 5 is not directly affected by dusts and high-temperature gas in the melting furnace body, a non-metallic material such as rubber or resin may be used instead of the metal bellows.

また、伸縮管５は廃棄物装入装置３の中間ホッパー３ｃに設置されるので、伸縮管５以下の廃棄物装入装置３の荷重は溶融炉本体１で支持し、最終的には溶融炉本体１の荷重と併せて支持部Ａで支持するようにすることができる。このような支持方式とすると、図３に示した従来の廃棄物溶融炉において下シール弁ケーシング３ｄを支持していた支持部Ｂを廃止することができ、そのための建築構造物の支持床が不要となり、建築コストを低減することができる。なお、伸縮管５より上方の廃棄物装入装置３及び装入ホッパー４の荷重は従来と同様に支持部Ｃで支持する。   Further, since the expansion tube 5 is installed in the intermediate hopper 3c of the waste charging device 3, the load of the waste charging device 3 below the expansion tube 5 is supported by the melting furnace body 1, and finally the melting furnace. Along with the load of the main body 1, it can be supported by the support portion A. With such a support system, the support part B supporting the lower seal valve casing 3d in the conventional waste melting furnace shown in FIG. 3 can be eliminated, and a support floor for the building structure for that purpose is unnecessary. Thus, the construction cost can be reduced. Note that the loads of the waste charging device 3 and the charging hopper 4 above the telescopic tube 5 are supported by the support portion C as in the conventional case.

本発明の廃棄物溶融炉の熱膨張吸収構造の一実施例を示す。An example of the thermal expansion absorption structure of the waste melting furnace of the present invention is shown. 図１の熱膨張吸収構造における伸縮管部分の詳細を示す。The detail of the expansion-contraction tube part in the thermal expansion absorption structure of FIG. 1 is shown. 従来の廃棄物溶融炉を示す。A conventional waste melting furnace is shown. 図３の廃棄物溶融炉における伸縮管部分の詳細を示す。The detail of the expansion-contraction pipe | tube part in the waste melting furnace of FIG. 3 is shown.

符号の説明Explanation of symbols

１ 溶融炉本体
２ 伸縮管
２ａ 耐火物
２ｂ セラミックウール
３ 廃棄物装入装置
３ａ 上シール弁
３ｂ 下シール弁
３ｃ 中間ホッパー
３ｄ 下シール弁ケーシング
４ 装入ホッパー
５ 伸縮管
５ａ 保護内筒 DESCRIPTION OF SYMBOLS 1 Melting furnace body 2 Expansion tube 2a Refractory 2b Ceramic wool 3 Waste charging device 3a Upper seal valve 3b Lower seal valve 3c Intermediate hopper 3d Lower seal valve casing 4 Loading hopper 5 Expansion tube 5a Protective inner cylinder

Claims (2)

溶融炉本体に上下２重シール式の廃棄物装入装置を接続した廃棄物溶融炉において、前記廃棄物装入装置の上シール弁と下シール弁との間の中間ホッパーの直胴部に伸縮管を設け、前記廃棄物溶融炉は、建築構造物の支持部で支持され、さらに、前記廃棄物装入装置の前記伸縮管以下の荷重を前記溶融炉本体で支持して前記溶融炉本体の荷重と併せて前記支持部で支持したことを特徴とする廃棄物溶融炉の熱膨張吸収構造。 In a waste melting furnace in which a double-sealed waste charging device is connected to the melting furnace body, it expands and contracts to the straight barrel of the intermediate hopper between the upper and lower seal valves of the waste charging device. A pipe is provided , and the waste melting furnace is supported by a support part of a building structure, and further, the load below the telescopic pipe of the waste charging device is supported by the melting furnace body to support the melting furnace body. A thermal expansion absorption structure for a waste melting furnace, wherein the structure is supported by the support portion together with a load . 前記伸縮管に２個の筒体を嵌め合わせた伸縮可能な構造の保護内筒を設けたことを特徴とする請求項１記載の廃棄物溶融炉の熱膨張吸収構造。 Thermal expansion absorber for a waste melting furnace according to claim 1, characterized in that a protection inner tube of extendable structure fitted with two cylindrical body to the expansion pipe.
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