JP2013194977A - Radiant tube type heating device - Google Patents

Radiant tube type heating device Download PDF

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JP2013194977A
JP2013194977A JP2012061951A JP2012061951A JP2013194977A JP 2013194977 A JP2013194977 A JP 2013194977A JP 2012061951 A JP2012061951 A JP 2012061951A JP 2012061951 A JP2012061951 A JP 2012061951A JP 2013194977 A JP2013194977 A JP 2013194977A
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tube
radiant tube
heat exchanger
burner
exhaust gas
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JP5965170B2 (en
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Thomas D Briselden
トーマス ディー ブリセルデン
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Nippon Steel Nisshin Business Service Co Ltd
Spinworks LLC
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Shinwa Kigyo Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

PROBLEM TO BE SOLVED: To provide a radiant tube type heating device capable of efficiently increasing a combustion air temperature and having good thermal efficiency.SOLUTION: A helical heat exchanger 3 made of silicon carbide includes a through hole 3a formed at the center to allow a burner 5 and a fuel supply pipe 4 to be inserted and penetrated through, and includes a helical plate-shaped ventilation chamber 3c passing through holes 3ba bored on flange parts 3b at both ends. The helical heat exchanger 3 is inserted and held in a connection tube 2 connected to one end of a radiant tube 1, installed on the outside Z of a furnace and having an exhaust gas outlet 2a formed at an end on a side opposite to a furnace wall Y, while only the ventilation holes 3ba of the flange parts 3b are not closed at both the ends. A housing 6 for forming an air chamber of combustion air is mounted at an end on the side opposite to the furnace wall Y of the connection tube 2. An exhaust gas recirculation tube 7 connected to the other end of the radiant tube 2 and installed on the outer side Z of the furnace is connected to the furnace wall Y side so that exhaust gas flows toward the helical heat exchanger 3.

Description

本発明は、熱効率が良好なラジアントチューブ式加熱装置に関するものである。   The present invention relates to a radiant tube type heating device having good thermal efficiency.

例えば、工業用加熱炉、熱処理炉等の加熱炉において、炉内に燃焼ガスが存在すると悪影響を及ぼす加熱炉にあっては、炉内を燃焼ガスで満たして直接過熱する代わりに、ラジアントチューブ式加熱装置を用いて、間接加熱で高温の雰囲気を作り、被処理物の加熱処理を行っている。このラジアントチューブ式加熱装置は、チューブ内で燃料を燃焼させ、チューブ外表面からの輻射熱で、被処理物の加熱を行うものである。   For example, in a heating furnace such as an industrial heating furnace or a heat treatment furnace, in a heating furnace that adversely affects the presence of combustion gas in the furnace, instead of directly heating the furnace with the combustion gas, a radiant tube type is used. Using a heating device, a high-temperature atmosphere is created by indirect heating, and the heat treatment of the workpiece is performed. This radiant tube type heating apparatus burns fuel in a tube and heats an object to be processed with radiant heat from the outer surface of the tube.

このラジアントチューブ式加熱装置としては、シングルエンドの直管タイプのラジアントチューブを有するラジアントチューブ式加熱装置や、Ｕ字型やＷ字型のラジアントチューブを有するラジアントチューブ式加熱装置などがある。   Examples of the radiant tube type heating device include a radiant tube type heating device having a single-end straight tube type radiant tube, and a radiant tube type heating device having a U-shaped or W-shaped radiant tube.

Ｕ字型やＷ字型のラジアントチューブを有するラジアントチューブ式加熱装置は、シングルエンドの直管タイプのラジアントチューブを有するラジアントチューブ式加熱装置に比べて、構造が簡単で且つ伝熱量が大きいため望ましい。   A radiant tube type heating device having a U-shaped or W-shaped radiant tube is desirable because it has a simple structure and a large amount of heat transfer compared to a radiant tube type heating device having a single-ended straight tube type radiant tube. .

このようなＵ字型やＷ字型のラジアントチューブを有するラジアントチューブ式加熱装置は、ラジアントチューブの一方側（加熱側）にはバーナが配置され、他方側（排出ガス側）にはこのバーナより発生した排ガスを排出する排ガス配管に接続されている。そして、排ガス側には、バーナに供給する燃焼用空気を予熱する熱交換器が配置され、この熱交換器により燃焼用空気は予熱されてバーナ側へ送られ、燃料を燃焼する燃焼用空気として使用されている。   In such a radiant tube type heating device having a U-shaped or W-shaped radiant tube, a burner is arranged on one side (heating side) of the radiant tube, and this burner is arranged on the other side (exhaust gas side). It is connected to an exhaust gas pipe that discharges the generated exhaust gas. On the exhaust gas side, a heat exchanger for preheating the combustion air supplied to the burner is arranged, and the combustion air is preheated by this heat exchanger and sent to the burner side as combustion air for burning the fuel. It is used.

この熱交換器としては、２重管構造となっており、内側の管に供給された空気は外側の管を通ってバーナ側へ送られ、排ガスは外側の管の外周を通過して排ガス配管から排出される構造が開示されている（例えば、特許文献１参照。）。しかしながら、このような構造では排ガスと外側の管のみが接触して熱交換するため、熱交換器が排ガスと接触する面積が制約され、常温で送風された空気は４００℃程度の予熱しか出来なかった。   As this heat exchanger, it has a double pipe structure, the air supplied to the inner pipe is sent to the burner side through the outer pipe, and the exhaust gas passes through the outer circumference of the outer pipe and passes through the exhaust pipe. The structure discharged | emitted from this is disclosed (for example, refer patent document 1). However, in such a structure, only the exhaust gas and the outer pipe are in contact with each other for heat exchange, so the area where the heat exchanger contacts the exhaust gas is restricted, and the air blown at room temperature can only preheat at about 400 ° C. It was.

そこで、予熱空気の温度をもっと上げて省エネルギーを向上させるため、蓄熱式ラジアントチューブ式加熱装置が開発された。この技術は、ラジアントチューブの両端部にバーナを配置し、バーナを交互燃焼させることで、それぞれのバーナに配置された蓄熱器にバーナで発生した燃焼ガスの顕熱を蓄熱させ、蓄熱した熱と燃焼用空気とで熱交換させながら燃焼用空気を予熱するものである（例えば、特許文献２参照。）。この技術により、予熱空気温度は１０００℃近い温度に上昇し、省エネルギー効果が期待されている。   Therefore, in order to increase the temperature of the preheated air and improve energy saving, a regenerative radiant tube heating device was developed. In this technology, burners are arranged at both ends of the radiant tube, and the burners are alternately burned, so that the sensible heat of the combustion gas generated in the burners is stored in the heat storage units arranged in each burner, and the stored heat and The combustion air is preheated while exchanging heat with the combustion air (see, for example, Patent Document 2). With this technique, the preheated air temperature rises to a temperature close to 1000 ° C., and an energy saving effect is expected.

しかしながら、この蓄熱式ラジアントチューブ式加熱装置では、バーナをラジアントチューブの両端に配置するため、バーナ数が通常の２倍となり、設備費が高くなる。特に、従来のラジアントチューブ式加熱装置から蓄熱式ラジアントチューブ式加熱装置への置き換えの場合には、燃焼制御システムの切換えも必要となり、設備及び工事費も格段にアップし工事期間も長くなるため、設備費アップに見合う効果が期待できず、それほど普及していない。   However, in this heat storage type radiant tube type heating device, since the burners are arranged at both ends of the radiant tube, the number of burners is doubled and the equipment cost is increased. In particular, when replacing the conventional radiant tube type heating device with a heat storage type radiant tube type heating device, it is also necessary to switch the combustion control system, and the equipment and construction costs will be significantly increased, and the construction period will be prolonged, An effect commensurate with the increase in equipment costs cannot be expected, and it is not so popular.

特開平７−３０５８３３号公報JP 7-305833 A 特開２０００−１８００８１号公報JP 2000-180081 A

そこで本発明は、蓄熱式ラジアントチューブ式加熱装置のようにバーナをラジアントチューブの両端に配置することなく、燃焼用空気の予熱温度を効率的に上昇させることができて熱効率が良好なラジアントチューブ式加熱装置を提供することを課題とする。   Therefore, the present invention is a radiant tube type that can efficiently increase the preheating temperature of the combustion air without disposing burners at both ends of the radiant tube as in the heat storage type radiant tube type heating device, and has a good thermal efficiency. It is an object to provide a heating device.

本発明者は、上記課題を解決すべく鋭意研究の結果、Ｕ字型又はＷ字型のラジアントチューブを有するラジアントチューブ式加熱装置において、ラジアントチューブの一端に接続されて炉外に設置される接続チューブ内に、
中央にバーナとこのバーナに流体燃料を供給する燃料供給用パイプとが挿入貫通される貫通孔を有し、両端に燃焼用空気が通過する通気孔が穿設されているフランジ状部が設けられており、両端のフランジ状部間に一方の通気孔から他方の通気孔に燃焼用空気を導くための中央の貫通孔を構成する管状部の外壁に設けられた２枚で一組の螺旋板状の側壁とこの螺旋板状の側壁の前記管状部の反対側を連結封鎖する封鎖壁で囲まれた通気室が軸方向に隣接する空気室側壁間に間隙を設けて形成されているシリコンカーバイト製の螺旋形状熱交換器が軸方向の両端をフランジ状部の通気孔だけを閉塞しない状態で挿入保持されており、
この螺旋形状熱交換器の中央の貫通孔にはバーナとこのバーナに流体燃料を供給する燃料供給用パイプとが挿入貫通せしめられており、また前記接続チューブの炉壁と反対側の端部には排ガスの出口が設けられていると共に螺旋形状熱交換器のフランジ状部の通気孔に供給する燃焼用空気の流入用空間を形成する空気室形成用ハウジングが取り付けられており、
ラジアントチューブの他端に接続されて炉外に設置される排ガス還流用チューブの他端は前記接続チューブの炉壁側で螺旋形状熱交換器に向けて排ガスが流入するように前記接続チューブに接続されている
構造にすればよいことを究明したのである。 As a result of diligent research to solve the above problems, the present inventor is connected to one end of the radiant tube and installed outside the furnace in the radiant tube type heating device having a U-shaped or W-shaped radiant tube. In the tube,
A flange-like portion having a through hole through which a burner and a fuel supply pipe for supplying fluid fuel to the burner are inserted and penetrated in the center and a vent hole through which combustion air passes is provided at both ends. And a set of two spiral plates provided on the outer wall of the tubular portion constituting the central through-hole for guiding the combustion air from one vent hole to the other vent hole between the flange-like portions at both ends A silicon car in which a ventilation chamber surrounded by a sealing wall for connecting and sealing the opposite side of the tubular portion of the spiral plate-like side wall is provided with a gap between the axially adjacent air chamber side walls A helical heat exchanger made of a bite is inserted and held in a state where both ends in the axial direction are not closed only in the vent hole of the flange-shaped part,
A burner and a fuel supply pipe for supplying fluid fuel to the burner are inserted through the central through-hole of the spiral heat exchanger, and at the end of the connecting tube opposite to the furnace wall. Is provided with an air chamber forming housing that is provided with an exhaust gas outlet and forms a space for inflow of combustion air to be supplied to the vent hole of the flange-shaped portion of the spiral heat exchanger.
The other end of the exhaust gas recirculation tube connected to the other end of the radiant tube and installed outside the furnace is connected to the connection tube so that the exhaust gas flows toward the spiral heat exchanger on the furnace wall side of the connection tube They found out that it would be better to use the same structure.

そして、このような構造のラジアントチューブ式加熱装置において、螺旋形状熱交換器が、両端のフランジ状部に穿設されている燃焼用空気が通過する通気孔が複数で且つこれら両端のフランジ状部に穿設されている複数の通気孔を連絡する螺旋状の通気室も複数になる多条ネジ状であると、螺旋のピッチが長くなるため空気室内の燃焼用空気の流動抵抗が小さくなるので好ましく、
接続チューブに接続されているラジアントチューブが、バーナよりの火炎が噴射される内管とその内管の外側で螺旋形状熱交換器から供給される燃焼用空気の一部をバーナよりの火炎の外周に送り込むことができる二重管構造であると、バーナよりの火炎に発生するＮＯｘを減少させることができるので好ましく、
この接続チューブに接続されているラジアントチューブが二重管構造の場合に内管に内管の内外を連通させる穴が穿設されていると、バーナよりの火炎に発生するＮＯｘを更に減少させることができるので好ましく、
また、接続チューブの炉壁側で排ガス還流用チューブの他端が接続されている部位の排ガス流入口を除いた接続チューブの内面と螺旋形状熱交換器の外面との間に断熱材が配置されていると、排ガス還流用チューブの他端から接続チューブ内に流入してきた排ガスが螺旋形状熱交換器の空気室の封鎖壁と接続チューブの内面との間に直ちに流入することが防止されて燃焼用空気の加熱効率が向上して好ましいことも究明したのである。 In the radiant tube heating device having such a structure, the spiral heat exchanger has a plurality of air holes through which the combustion air is drilled in the flange-like portions at both ends, and the flange-like portions at both ends. If a plurality of spiral ventilation chambers connecting a plurality of ventilation holes drilled in the multi-threaded screw, the pitch of the spiral becomes longer, so the flow resistance of combustion air in the air chamber becomes smaller. Preferably
The radiant tube connected to the connecting tube is used to divide the inner pipe into which the flame from the burner is injected and a part of the combustion air supplied from the spiral heat exchanger outside the inner pipe from the burner. A double pipe structure that can be fed into the furnace is preferable because NOx generated in the flame from the burner can be reduced,
When the radiant tube connected to this connection tube has a double pipe structure, if the inner pipe has a hole for communicating the inside and outside of the inner pipe, NOx generated in the flame from the burner can be further reduced. It is preferable because
Also, a heat insulating material is disposed between the inner surface of the connection tube excluding the exhaust gas inlet at the portion where the other end of the exhaust gas recirculation tube is connected on the furnace wall side of the connection tube and the outer surface of the spiral heat exchanger. The exhaust gas flowing into the connection tube from the other end of the exhaust gas recirculation tube is prevented from flowing immediately between the sealing wall of the air chamber of the spiral heat exchanger and the inner surface of the connection tube, and combustion It has also been found that the heating efficiency of the working air is improved.

本発明に係るラジアントチューブ式加熱装置は、燃焼用空気を２枚で一組の螺旋板状の側壁間に形成した螺旋状の通気室を経てバーナ方向に導く耐熱性が優れ且つ高熱伝導率を有するシリコンカーバイト製の螺旋形状熱交換器の螺旋状の通気室の外面を燃焼用空気の流動方向を逆方向に流動する排ガスで加熱することによって、燃焼用空気温度を効率良く高温に上昇させることができ、蓄熱式ラジアンチトユーブ式加熱装置のようにバーナを２台設置する必要もなく、設備費や工事費を大幅に削減することができる。また、従来のラジアントチューブ式加熱装置にも熱交換器部を取り替えるだけで簡単に設置することが可能であり、省エネルギー効果を高めることができる。   The radiant tube heating device according to the present invention has excellent heat resistance and high thermal conductivity that guides the combustion air in the burner direction through a spiral ventilation chamber formed between a pair of spiral plate-like sidewalls. By heating the outer surface of the spiral ventilation chamber of a spiral heat exchanger made of silicon carbide with exhaust gas flowing in the direction opposite to the flow direction of combustion air, the temperature of the combustion air is efficiently raised to a high temperature. In addition, it is not necessary to install two burners as in the case of the heat storage type radiant tube type heating device, and the facility cost and construction cost can be greatly reduced. In addition, the conventional radiant tube heating device can be easily installed simply by replacing the heat exchanger, and the energy saving effect can be enhanced.

本発明に係るラジアントチューブ式加熱装置の外観説明図である。It is an external appearance explanatory view of the radiant tube type heating device concerning the present invention. 本発明に係るラジアントチューブ式加熱装置の要部拡大断面説明図である。It is principal part expanded sectional explanatory drawing of the radiant tube type heating apparatus which concerns on this invention. 本発明に係るラジアントチューブ式加熱装置に使用する螺旋形状熱交換器の形状を示す斜視図である。It is a perspective view which shows the shape of the helical heat exchanger used for the radiant tube type heating apparatus which concerns on this invention.

以下、図面により本発明に係るラジアントチューブ式加熱装置について説明する。
図面中、１は炉内Ｘに配置されたＵ字型又はＷ字型のラジアントチューブであり、その一端には炉外Ｚに設置される接続チューブ部２が接続されている。この接続チューブ部２の炉壁Ｙと反対側の端部には排ガスの出口2aが設けられている Hereinafter, a radiant tube heating device according to the present invention will be described with reference to the drawings.
In the drawings, reference numeral 1 denotes a U-shaped or W-shaped radiant tube disposed in the furnace X, and a connection tube portion 2 installed outside the furnace Z is connected to one end thereof. An exhaust gas outlet 2a is provided at the end of the connection tube portion 2 opposite to the furnace wall Y.

３は中央にバーナ５とこのバーナ５に流体燃料を供給する燃料供給用パイプ４とが挿入貫通される貫通孔3aを有し、両端に燃焼用空気が通過する通気孔3baが穿設されているフランジ状部3bが設けられており、両端のフランジ状部3b，3b間に一方の通気孔3baから他方の通気孔3baに燃焼用空気を導くための中央の貫通孔3aを構成する管状部3aaの外壁に設けられた２枚で一組の螺旋板状の側壁3ca，3caとこの螺旋板状の側壁3ca，3caの前記管状部3aaの反対側を連結封鎖する封鎖壁3cbで囲まれた通気室3cが軸方向に隣接する空気室側壁3ca間に間隙を設けて形成されているシリコンカーバイト製の螺旋形状熱交換器である。この螺旋形状熱交換器３は、その軸方向の両端をフランジ状部3b，3bの通気孔3baだけを閉塞しない状態で接続チューブ部２内に挿入保持されている。   3 has a through hole 3a through which a burner 5 and a fuel supply pipe 4 for supplying fluid fuel to the burner 5 are inserted and penetrated, and a vent hole 3ba through which combustion air passes is formed at both ends. A tubular portion constituting a central through-hole 3a for guiding combustion air from one vent hole 3ba to the other vent hole 3ba between the flange-like portions 3b, 3b at both ends. A pair of spiral plate-like side walls 3ca, 3ca provided on the outer wall of 3aa and the opposite sides of the spiral plate-like side walls 3ca, 3ca opposite to the tubular portion 3aa are surrounded by a sealing wall 3cb. This is a spiral heat exchanger made of silicon carbide in which the ventilation chamber 3c is formed with a gap between the air chamber side walls 3ca adjacent in the axial direction. The spiral heat exchanger 3 is inserted and held in the connection tube portion 2 with its axial ends not closed only in the vent holes 3ba of the flange-like portions 3b and 3b.

この螺旋形状熱交換器３は、両端のフランジ状部3b，3bに穿設されている燃焼用空気が通過する通気孔3baが複数で且つこれら両端のフランジ状部3b，3bに穿設されている複数の通気孔3baを連絡する螺旋状の通気室3cも複数になる多条ネジ状であると、螺旋のピッチが長くなるため空気室3c内の燃焼用空気の流動抵抗が小さくなるので好ましい。   The spiral heat exchanger 3 has a plurality of air holes 3ba through which combustion air passes, which are formed in the flange-like portions 3b, 3b at both ends, and are formed in the flange-like portions 3b, 3b at both ends. It is preferable that a plurality of spiral ventilation chambers 3c connecting a plurality of ventilation holes 3ba have a multi-threaded screw shape because the pitch of the spiral is increased and the flow resistance of combustion air in the air chamber 3c is reduced. .

６はラジアントチューブ１の一端に接続されて炉外Ｚに設置される接続チューブ部２の炉壁Ｙと反対側の端部に取り付けられており、螺旋形状熱交換器３のフランジ状部3bの通気孔3baに供給する燃焼用空気の流入用空間6aを形成する空気室形成用ハウジングである。   6 is attached to one end of the radiant tube 1 and attached to the end of the connecting tube portion 2 on the opposite side of the furnace wall Y that is installed outside the furnace Z, and is connected to the flange-like portion 3b of the helical heat exchanger 3. This is an air chamber forming housing that forms an inflow space 6a for the combustion air supplied to the vent hole 3ba.

７はラジアントチューブ１の他端に接続されて炉外Ｚに設置される排ガス還流用チューブであり、その他端は接続チューブ２の炉壁Ｙ側で螺旋形状熱交換器３に向けて排ガスが流入するように接続されている。そして接続チューブ２の炉壁Ｙ側で排ガス還流用チューブ７の他端が接続されている部位の排ガス流入口2bを除いた接続チューブ２の内面と螺旋形状熱交換器３の外面との間に断熱シートを積層したような構成の断熱材８が配置されていると、排ガス還流用チューブ７の他端から接続チューブ２内に流入してきた排ガスが螺旋形状熱交換器３の空気室3cの封鎖壁3cbと接続チューブ３の内面との間に直ちに流入することが防止され、螺旋形状熱交換器３の軸方向に隣接する空気室側壁3ca間の間隙に流入して螺旋形状熱交換器３の通気室3cを流動する燃焼用空気と逆方向に流動するため、燃焼用空気の加熱効率が向上して好ましいのである。   7 is an exhaust gas recirculation tube connected to the other end of the radiant tube 1 and installed outside the furnace Z, and the other end of the exhaust tube flows into the spiral heat exchanger 3 on the furnace wall Y side of the connection tube 2. To be connected. And between the inner surface of the connection tube 2 and the outer surface of the spiral heat exchanger 3 excluding the exhaust gas inlet 2b at the portion where the other end of the exhaust gas recirculation tube 7 is connected on the furnace wall Y side of the connection tube 2. When the heat insulating material 8 having a structure in which heat insulating sheets are stacked is disposed, the exhaust gas flowing into the connection tube 2 from the other end of the exhaust gas recirculation tube 7 is sealed in the air chamber 3c of the spiral heat exchanger 3. Immediately flowing between the wall 3cb and the inner surface of the connecting tube 3 is prevented, and flows into the gap between the air chamber side walls 3ca adjacent to the axial direction of the helical heat exchanger 3 so that the helical heat exchanger 3 Since it flows in the opposite direction to the combustion air flowing in the ventilation chamber 3c, the heating efficiency of the combustion air is improved, which is preferable.

なお、接続チューブ２に接続されているラジアントチューブ１が、バーナ５よりの火炎が噴射される内管1aとその内管1aの外側で螺旋形状熱交換器３から供給される燃焼用空気の一部をバーナ５よりの火炎の外周に送り込むことができる二重管構造であると、バーナ５よりの火炎に発生するＮＯｘを減少させることができるので好ましく、この場合に内管1aに内管1aの内外を連通させる穴1aaが穿設されていると、バーナ５よりの火炎に発生するＮＯｘを更に減少させることができるので好ましい。   The radiant tube 1 connected to the connection tube 2 is one of the combustion air supplied from the spiral heat exchanger 3 outside the inner tube 1a to which the flame from the burner 5 is injected and the inner tube 1a. It is preferable that the structure has a double pipe structure in which the portion can be fed to the outer periphery of the flame from the burner 5 because NOx generated in the flame from the burner 5 can be reduced. In this case, the inner pipe 1a is connected to the inner pipe 1a. It is preferable that a hole 1aa for communicating the inside and the outside of the cylinder is formed since NOx generated in the flame from the burner 5 can be further reduced.

上記したような構造の本発明に係るラジアントチューブ式加熱装置においては、接続チューブ部２の炉壁Ｙと反対側の端部に取り付けられている空気室形成用ハウジング６の流入用空間6aに燃焼用空気を供給して螺旋形状熱交換器３の炉壁Ｙと反対側の端部のフランジ状部3bの通気孔3baから螺旋状の通気室3cを経て炉壁Ｙ側の端部のフランジ状部3bの通気孔3baからＵ字型又はＷ字型のラジアントチューブ１内に燃焼用空気を送り込むと共に、螺旋形状熱交換器３の中央の貫通孔3aに挿入貫通された燃料供給用パイプ４から流体燃料を供給して燃料供給用パイプ４の先端に取り付けたバーナ５によって流体燃料を着火して火炎をラジアントチューブ１内に発生させるのである。この際、接続チューブ２に接続されているラジアントチューブ１が、バーナ５よりの火炎が噴射される内管1aとその内管1aの外側で螺旋形状熱交換器３から供給される燃焼用空気の一部をバーナ５よりの火炎の外周に送り込むことができる二重管構造であると、バーナ５よりの火炎に発生するＮＯｘを減少させることができるので好ましく、この場合に内管1aに内管1aの内外を連通させる穴1aaが穿設されていると、バーナ５よりの火炎に発生するＮＯｘを更に減少させることができるのである。   In the radiant tube type heating device according to the present invention having the above-described structure, combustion occurs in the inflow space 6a of the air chamber forming housing 6 attached to the end of the connection tube portion 2 opposite to the furnace wall Y. Air is supplied to the spiral heat exchanger 3 from the vent hole 3ba of the flange-shaped portion 3b opposite to the furnace wall Y, through the spiral vent chamber 3c, and the flange-shaped flange at the end of the furnace wall Y side. Combustion air is fed into the U-shaped or W-shaped radiant tube 1 from the vent hole 3ba of the portion 3b, and from the fuel supply pipe 4 inserted through the central through hole 3a of the spiral heat exchanger 3 The fluid fuel is supplied and the fluid fuel is ignited by the burner 5 attached to the tip of the fuel supply pipe 4 to generate a flame in the radiant tube 1. At this time, the radiant tube 1 connected to the connection tube 2 is used for the inner pipe 1a into which the flame from the burner 5 is injected and the combustion air supplied from the helical heat exchanger 3 outside the inner pipe 1a. A double pipe structure that can send a part of the flame from the burner 5 to the outer circumference of the flame is preferable because NOx generated in the flame from the burner 5 can be reduced. In this case, the inner pipe is connected to the inner pipe 1a. If the hole 1aa for communicating the inside and outside of 1a is formed, NOx generated in the flame from the burner 5 can be further reduced.

かくしてラジアントチューブ１内の火炎は、ラジアントチューブ１を高温に加熱して間接加熱で炉内Ｘに高温の雰囲気を作り、被処理物の加熱処理を行った後、排ガス還流用チューブ７より接続チューブ部２の排ガス流入口2bを経て接続チューブ部２内の螺旋形状熱交換器３に向けて流入し、螺旋形状熱交換器３の通気室3cを流動する燃焼用空気と逆方向に流動して螺旋形状熱交換器３の通気室3cを流動する燃焼用空気を通気室3cの外壁を構成する２枚で一組の螺旋板状の側壁3ca，3caとこの螺旋板状の側壁3ca，3caの管状部3aaの反対側を連結封鎖する封鎖壁3cbとを介して加熱して接続チューブ部２の炉壁Ｙと反対側の端部に設けられている排ガスの出口2aから排出せしめられるのである。
この際、螺旋形状熱交換器３は耐熱性に優れ且つ熱伝導率が高いシリコンカーバイト製であるので、螺旋形状熱交換器３の温度は短時間で高温に加熱されて熱効率良く螺旋形状熱交換器３の通気室3cを流動する燃焼用空気を予熱することができるのである。 Thus, the flame in the radiant tube 1 is heated from the radiant tube 1 to a high temperature to create a high temperature atmosphere in the furnace X by indirect heating. Flows into the spiral heat exchanger 3 in the connection tube portion 2 through the exhaust gas inlet 2b of the portion 2, flows in the opposite direction to the combustion air flowing in the ventilation chamber 3c of the spiral heat exchanger 3. Combustion air flowing in the ventilation chamber 3c of the spiral heat exchanger 3 is composed of two sheets of spiral plate-like side walls 3ca, 3ca constituting the outer wall of the ventilation chamber 3c and the spiral plate-like side walls 3ca, 3ca. It is heated through a sealing wall 3cb that connects and seals the opposite side of the tubular portion 3aa, and is discharged from an exhaust gas outlet 2a provided at the end of the connecting tube portion 2 opposite to the furnace wall Y.
At this time, since the helical heat exchanger 3 is made of silicon carbide having excellent heat resistance and high thermal conductivity, the temperature of the helical heat exchanger 3 is heated to a high temperature in a short time, and the helical heat is efficiently heated. The combustion air flowing in the ventilation chamber 3c of the exchanger 3 can be preheated.

このような螺旋形状熱交換器３において排ガスによる螺旋形状熱交換器３の通気室3cを流動する燃焼用空気の加熱は、接続チューブ２の炉壁Ｙ側で排ガス還流用チューブ７の他端が接続されている部位の排ガス流入口2bを除いた接続チューブ２の内面と螺旋形状熱交換器３の外面との間に断熱材８が配置されていると、排ガス還流用チューブ７の他端から接続チューブ２内に流入してきた排ガスが螺旋形状熱交換器３の空気室3cの封鎖壁3cbと接続チューブ３の内面との間に直ちに流入することが防止され、螺旋形状熱交換器３の軸方向に隣接する空気室側壁3ca間の間隙に流入して螺旋形状熱交換器３通気室3cを流動する燃焼用空気と逆方向に流動するため、加熱効率が向上するのである。   In such a helical heat exchanger 3, the combustion air flowing through the ventilation chamber 3 c of the helical heat exchanger 3 by exhaust gas is heated by the other end of the exhaust gas recirculation tube 7 on the furnace wall Y side of the connection tube 2. When the heat insulating material 8 is disposed between the inner surface of the connection tube 2 excluding the exhaust gas inlet 2b of the connected portion and the outer surface of the spiral heat exchanger 3, the other end of the exhaust gas recirculation tube 7 is provided. The exhaust gas flowing into the connection tube 2 is prevented from immediately flowing between the sealing wall 3cb of the air chamber 3c of the spiral heat exchanger 3 and the inner surface of the connection tube 3, and the shaft of the spiral heat exchanger 3 is prevented. Since it flows into the gap between the air chamber side walls 3ca adjacent in the direction and flows in the direction opposite to the combustion air flowing in the spiral heat exchanger 3 vent chamber 3c, the heating efficiency is improved.

Ｘ 炉内
Ｙ 炉壁
Ｚ 炉外
１ ラジアントチューブ
1a 内管
1aa 穴
２ 接続チューブ部
2a 排ガスの出口
2b 排ガス流入口
３ 螺旋形状熱交換器
3a 貫通孔
3aa 管状部
3b フランジ状部
3ba 通気孔
3c 通気室
3ca 螺旋板状の側壁
3cb 封鎖壁
４ 燃料供給用パイプ
５ バーナ
６ 空気室形成用ハウジング
6a 燃焼用空気の流入用空間
７ 排ガス還流用チューブ
８ 断熱材 X Furnace Y Furnace wall Z Furnace 1 Radiant tube
1a Inner pipe
1aa Hole 2 Connection tube
2a Exhaust gas outlet
2b Exhaust gas inlet 3 Spiral heat exchanger
3a Through hole
3aa Tubular part
3b Flange-shaped part
3ba vent
3c Ventilation chamber
3ca spiral plate side wall
3cb Sealing wall 4 Fuel supply pipe 5 Burner 6 Air chamber forming housing
6a Combustion air inflow space 7 Exhaust gas recirculation tube 8 Insulation

Claims (5)

Ｕ字型又はＷ字型のラジアントチューブ(１)を有するラジアントチューブ式加熱装置において、ラジアントチューブ(１)の一端に接続されて炉外に設置される接続チューブ(２)内に、
中央にバーナ(５)とこのバーナ(５)に流体燃料を供給する燃料供給用パイプ(４)とが挿入貫通される貫通孔(3a)を有し、両端に燃焼用空気が通過する通気孔(3ba)が穿設されているフランジ状部(3b)が設けられており、両端のフランジ状部(3b，3b)間に一方の通気孔(3ba)から他方の通気孔(3ba)に燃焼用空気を導くための中央の貫通孔(3a)を構成する管状部(3aa)の外壁に設けられた２枚で一組の螺旋板状の側壁(3ca)とこの螺旋板状の側壁(3ca)の前記管状部(3aa)の反対側を連結封鎖する封鎖壁(3cb)で囲まれた通気室(3c)が軸方向に隣接する空気室側壁(3ca，3ca)間に間隙を設けて形成されているシリコンカーバイト製の螺旋形状熱交換器(３)が軸方向の両端をフランジ状部(3b)の通気孔(3ba)だけを閉塞しない状態で挿入保持されており、
この螺旋形状熱交換器(３)の中央の貫通穴(3a)にはバーナ(５)とこのバーナ(５)に流体燃料を供給する燃料供給用パイプ(４)とが挿入貫通せしめられており、また前記接続チューブ(２)の炉壁(Ｙ)と反対側の端部には排ガスの出口(2a)が設けられていると共に螺旋形状熱交換器(３)のフランジ状部(3b)の通気孔(3ba)に供給する燃焼用空気の流入用空間(6a)を形成する空気室形成用ハウジング(６)が取り付けられており、
ラジアントチューブ(１)の他端に接続されて炉外(Ｚ)に設置される排ガス還流用チューブ(７)の他端は前記接続チューブ(２)の炉壁(Ｙ)側で螺旋形状熱交換器(３)に向けて排ガスが流入するように前記接続チューブ(２)に接続されている
構造のラジアントチューブ式加熱装置。 In the radiant tube type heating device having the U-shaped or W-shaped radiant tube (1), the connection tube (2) connected to one end of the radiant tube (1) and installed outside the furnace is provided.
There is a through hole (3a) through which a burner (5) and a fuel supply pipe (4) for supplying fluid fuel to the burner (5) are inserted and penetrated in the center, and a ventilation hole through which combustion air passes at both ends. (3ba) is provided with a flange-like part (3b), and between the flange-like parts (3b, 3b) at both ends, one vent hole (3ba) burns to the other vent hole (3ba). A pair of spiral plate-like side walls (3ca) provided on the outer wall of the tubular portion (3aa) constituting the central through hole (3a) for guiding the working air, and this spiral plate-like side wall (3ca ) Is formed with a gap between the air chamber side walls (3ca, 3ca) adjacent in the axial direction, surrounded by a sealing wall (3cb) that connects and seals the opposite side of the tubular portion (3aa) The helical heat exchanger (3) made of silicon carbide is inserted and held in a state where both ends in the axial direction are not closed only in the vent hole (3ba) of the flange-shaped part (3b).
A burner (5) and a fuel supply pipe (4) for supplying fluid fuel to the burner (5) are inserted through the central through hole (3a) of the spiral heat exchanger (3). Further, an exhaust gas outlet (2a) is provided at the end of the connecting tube (2) opposite to the furnace wall (Y) and the flange-shaped part (3b) of the helical heat exchanger (3) is provided. An air chamber forming housing (6) that forms an inflow space (6a) for combustion air supplied to the vent hole (3ba) is attached.
The other end of the exhaust gas recirculation tube (7) connected to the other end of the radiant tube (1) and installed outside the furnace (Z) is spiral-shaped heat exchange on the furnace wall (Y) side of the connection tube (2). A radiant tube heating device having a structure connected to the connection tube (2) so that exhaust gas flows toward the vessel (3). 螺旋形状熱交換器(３)が、両端のフランジ状部(3b)に穿設されている燃焼用空気が通過する通気孔(3ba)が複数で且つ他方のフランジ状部(3b)間に穿設されている複数の通気孔(3ba)に燃焼用空気を螺旋状に導く通気室(3c)も複数になる多条ネジ状である請求項１に記載のラジアントチューブ式加熱装置。   The spiral heat exchanger (3) has a plurality of ventilation holes (3ba) through which the combustion air passes, which are formed in the flange-like portions (3b) at both ends, and is formed between the other flange-like portions (3b). 2. The radiant tube heating device according to claim 1, wherein a plurality of ventilation chambers (3 c) for guiding combustion air in a spiral manner to the plurality of ventilation holes (3 ba) provided are in a multi-threaded screw shape. 接続チューブ(２)に接続されているラジアントチューブ(１)が、バーナ(５)よりの火炎が噴射される内管(1a)とその内管(1a)の外側で螺旋形状熱交換器(３)から供給される燃焼用空気の一部をバーナ(５)よりの火炎の外周に送り込むことができる二重管構造である請求項１又は２に記載のラジアントチューブ式加熱装置。   The radiant tube (1) connected to the connecting tube (2) is connected to the inner heat pipe (1a) through which the flame from the burner (5) is injected, and the helical heat exchanger (3) outside the inner pipe (1a). The radiant tube heating device according to claim 1 or 2, wherein a part of the combustion air supplied from the burner (5) has a double pipe structure capable of being fed into the outer periphery of the flame from the burner (5). 内管(1a)に内管(1a)の内外を連通させる穴(1aa)が穿設されている請求項３に記載のラジアントチューブ式加熱装置。   The radiant tube heating device according to claim 3, wherein a hole (1aa) for communicating the inside and outside of the inner tube (1a) is formed in the inner tube (1a). 接続チューブ(２)の炉壁(Ｙ)側で排ガス還流用チューブ(７)の他端が接続されている部位の排ガス流入口(2b)を除いた接続チューブ(２)の内面と螺旋形状熱交換器(３)の外面との間に断熱材(８)が配置されている請求項１から４のいずれか１項に記載のラジアントチューブ式加熱装置。   The inner surface of the connection tube (2) except for the exhaust gas inlet (2b) where the other end of the exhaust gas recirculation tube (7) is connected to the furnace wall (Y) side of the connection tube (2) and the spiral heat The radiant tube type heating device according to any one of claims 1 to 4, wherein a heat insulating material (8) is disposed between the outer surface of the exchanger (3).
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CN106051761A (en) * 2015-04-16 2016-10-26 大同特殊钢株式会社 Radiant tube heating device
TWI671493B (en) * 2015-04-16 2019-09-11 日商大同特殊鋼股份有限公司 Radiant tube type heating device
CN107664457A (en) * 2016-07-28 2018-02-06 大同特殊钢株式会社 Radiant tube type firing equipment
CN109654492A (en) * 2019-01-24 2019-04-19 浙江佑伏能源科技有限公司 A kind of efficiently low nitrogen premixed type spiral integral type generator
CN109654492B (en) * 2019-01-24 2023-11-24 上海佑伏科技有限公司 High-efficiency low-nitrogen premixing type spiral integrated generator
CN113830986A (en) * 2021-10-25 2021-12-24 北京新风航天装备有限公司 Double-heating-cavity oily sludge pyrolysis device

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