JP4114513B2

JP4114513B2 - Rotary furnace heat treatment equipment

Info

Publication number: JP4114513B2
Application number: JP2003065926A
Authority: JP
Inventors: 佳行柏木
Original assignee: Meidensha Corp
Current assignee: Meidensha Corp
Priority date: 2003-03-12
Filing date: 2003-03-12
Publication date: 2008-07-09
Anticipated expiration: 2023-03-12
Also published as: JP2004271142A

Description

【０００１】
【発明の属する技術分野】
この発明は、回転炉加熱処理装置に関するものである。
【０００２】
【従来の技術】
一般に、各種被処理物（各種の汚泥、有機性物質、生産活動で発生した端材など）を乾燥処理や熱分解処理（炭化処理）などの加熱処理することが行われており、加熱処理においては、被処理物を回転炉内に導入し、かつ外部から間接加熱により内部の被処理物を熱分解して処理することが行われている。このような間接加熱の利点は、被処理物を直接加熱しないで、熱分解により水分を除去して乾物を得る、又はさらに加熱して、可燃性の揮発成分を分解除去して炭化物を得ることから、被処理物の素材の特徴を活かすことができる。しかし、間接加熱においては、回転炉内への空気の浸入を制限して分解することから、回転炉の両端の固定部材との間に位置するシール部の気密性が重要となる。即ち、シール部がその機能を十分に発揮しないで空気が浸入すると、分解した可燃性成分が発火して回転炉の内部で燃焼することにより、装置が損傷し、あるいは安定した加熱処理を行うことが困難となった。
【０００３】
この種のシール部を備えた回転炉加熱処理装置としては、特許文献１及び特許文献２があり、特に特許文献１の図８及び特許文献２の図２に示された構成が一般的である。そこで、これらの構成について図５により説明すると、１は円筒状の回転炉であり、その外周側には回転炉１を加熱する加熱手段が設けられている。２は回転炉１の端部に位置する被処理物の固定された排出ボックスであり、回転炉１と排出ボックス２との間には熱風の放出や外部空気の侵入を防止するためにシール部３が設けられる。
【０００４】
シール部３においては、排出ボックス２に円筒部２ａが設けられ、円筒部２ａの軸方向外端には径方向内方に突出したパッキン係合部２ｂが設けられ、円筒部２ａの軸方向内端には径方向外方に突出した取付部２ｃが設けられる。円筒部２ａと回転炉１との間には、図６に示すように、グランドパッキン４が工具を用いて軸方向に挿入される。５は外径が円筒部２ａの内径にほぼ等しい円筒部５ａと円筒部５ａの軸方向内端に径方向外方に突出して形成された突出部５ｂとから成るパッキン押さえであり、図６に示すように、突出部５ｂに設けられた挿通孔５ｃに挿通された取付ねじ６を取付部２ｃの雌ねじ部２ｄに螺合することにより、グランドパッキン４をパッキン押さえ５の円筒部５ａとパッキン係合部２ｂとの間に保持する。このように、円筒部２ａ、パッキン係合部２ｂ、取付部２ｃ、グランドパッキン４、パッキン押さえ５及び取付ねじ６によりシール部３は構成される。
【０００５】
【特許文献１】
特開平６−３００４５３号公報（第８図）
【０００６】
【特許文献２】
特開昭６０−１５９５８５号公報（第２図）
【０００７】
【発明が解決しようとする課題】
しかしながら、上記した従来の回転炉加熱処理装置においては、排出ボックス２の円筒部２ａとパッキン係合部２ｂと取付部２ｃとが一体に形成されているので、グランドパッキン４の交換作業が容易でなかった。一方、グランドパッキン４は、定期的に交換しないと劣化し、この部分から空気が浸入し、分解ガスが発火燃焼することとなった。又、回転炉１は熱により矢印７に示すように膨張、収縮するので、回転炉１を回転させる駆動源との連結が容易でなかった。
【０００８】
この発明は上記のような課題を解決するために成されたものであり、シール部のパッキン材の着脱を容易に行うことができ、保守点検が容易となり、停止時間を短縮することができる回転炉加熱処理装置を得ることを目的とする。
【０００９】
【課題を解決するための手段】
この発明の請求項１に係る回転炉加熱処理装置は、回転自在に支持された回転炉の一端側から投入ボックスを介して被処理物を投入し、該被処理物を回転炉の他端側から排出ボックスを介して排出又は次回転炉に移動させ,回転炉の外周側から間接加熱により加熱処理する回転炉加熱処理装置であって、投入又は排出ボックスと回転炉との間隔に、該間隔を気密にシールするシール部を備えた回転炉加熱処理装置において、シール部を、回転炉の外周に該外周と平行にかつ筒状に係合するパッキン部材と、上記ボックスに設けられ、パッキン部材の軸方向外端部と係合するパッキン係合部と、パッキン部材の外周側を包囲しかつ周方向に分割自在であってパッキン係合部と結合されるパッキン室枠と、パッキン室枠と結合されるとともに、周方向分割自在であり、パッキン室枠内におけるパッキン部材を回転炉軸方向外端側に押圧するパッキン押さえとにより構成し、かつ回転炉の両端側に環状の突出部を設け、この各突出部をそれぞれ回転支持ローラにより支持するとともに、一方の回転支持ローラを加熱時の回転炉の伸びの基点となるように前記突出部と嵌合する鍔部を有するものとしたものである。
【００１０】
【発明の実施の形態】
以下、この発明の実施の形態を図面とともに説明する。図２はこの発明の実施形態による回転炉加熱処理装置の正面図を示し、回転炉８は被処理物（前述したように、汚泥、有機性物質、生産活動で発生した端材など）を間接加熱により乾燥処理、熱分解処理することが可能であり、回転炉８の周囲には回転炉８を外部から加熱する外部加熱手段９が設けられ、外部加熱手段９内には熱風ガスが導入され、この熱風ガスは回転炉８を外部加熱した後、排出、循環される。回転炉８と外部加熱手段９とにより回転加熱処理炉１０が形成され、乾燥炉、炭化炉として利用される。
【００１１】
回転炉８の一端側にはシール部１１を介して被処理物の投入ボックス１２が設けられ、回転炉８の他端側には同じくシール部１３を介して排出ボックス１４が設けられ、回転炉８内には被処理物を攪拌搬送するための送り羽根（図示省略）が複数枚設けられる。又、回転炉８の両端側に環状の突出部８ａ，８ｂが設けられ、突出部８ａ，８ｂは回転支持ローラ１５，１６により回転自在に支持され、回転支持ローラ１６は加熱時回転炉８に伸びが生じても回転炉８の排出側が伸びの基点となるように両端に鍔部１６ａを有し、突出部８ｂと嵌合している。このため、回転炉８は投入ボックス１２側に主に伸びる。ただし、回転炉８は排出側にも少し伸びる。又、回転炉８における突出部８ｂの端部側にはスプロケット１７が設けられ、スプロケット１７に係合されたチェーン１８は駆動源であるモータ１９に取り付けられたスプロケット２０と係合する。
【００１２】
投入ボックス１２から投入された被処理物は、ガイド２７を介して回転炉８内に導入される。回転炉８はモータ１９により回転駆動され、回転炉８内に導入された被処理物は攪拌されながら排出側へ移送される。回転炉８内は上記したように熱風ガスにより所定温度に加熱され、被処理物は間接加熱により乾燥（水分除去）されて乾燥物となり、またこの乾燥物はさらに間接加熱により熱分解処理（炭化処理）されて炭化物となり、これらの乾燥物や炭化物は排出ボックス１４を介して処理物として取り出される。又、回転炉８内で発生した水蒸気、熱分解ガス、可燃性成分等の被処理ガスも排出ボックス１４を介して取り出される。
【００１３】
図１はシール部１３の縦断面図を示し、排出ボックス１４には回転炉８の外径よりやや大きい径の円筒部１４ａが軸方向内側に突出して形成され、円筒部１４ａの内端には径方向外側に突出したパッキン係合部１４ｂが形成される。２１は回転炉８の外周と係合するグランドパッキン４の外周側を包囲する円筒状のパッキン室枠であり、その軸方向の内外端には径方向外側に突出した突出部２１ａ，２１ｂが設けられる。パッキン室枠２１は図３に示すように周方向に複数に分割されて各分割片２２となり、その突出部２１ｂに立設された接続部２２ａ間をボルト２３により連結することにより、パッキン室枠２１は環状に組み合わされる。突出部２１ｂには挿通孔２１ｃが形成され、挿通孔２１ｃに挿通したボルト２４をパッキン係合部１４ｂに設けた雌ねじ部１４ｃに螺合することにより、パッキン係合部１４ｂと突出部２１ｂとは結合される。２５は外径がパッキン室枠２１の内径とほぼ等しい円筒部２５ａと、円筒部２５ａの軸方向内端に径方向外方に突出して形成された突出部２５ｂとからなるパッキン押さえであり、突出部２５ｂに設けられた挿通孔２５ｃに挿通されたボルト２６をパッキン室枠２１の突出部２１ａに設けられた雌ねじ部２１ｄに螺合することにより、パッキン押さえ２５とパッキン室枠２１とは結合される。パッキン押さえ２５も周方向に複数に分割された構造で、かつ一体化可能な構造となっている。なお、シール部１１もシール部１３と同様の構造となっている。
【００１４】
次に、図４によりシール部１３の形成手順を説明する。まず、回転炉８の外周にグランドパッキン４を複数条巻回し、その端部を粘着テープにより仮止めする。次に、パッキン室枠２１の各分割片２２をグランドパッキン４の外周に配置し、パッキン室枠２１として一体化して装着し、ボルト２４を挿通孔２１ｃに挿通してパッキン係合部１４ｂの雌ねじ部１４ｃに螺合し、パッキン係合部１４ｂとパッキン室枠２１とを結合する。次に、回転炉８の外周で分割構造のパッキン押さえ２５を一体化し、挿通孔２５ｃに挿通したボルト２６をパッキン室枠２１の雌ねじ部２１ｄに螺合することにより、グランドパッキン４を軸方向外側に押圧し、パッキン押さえ２５とパッキン室枠２１とを結合する。
【００１５】
上記実施形態においては、グランドパッキン４の外周を包囲するパッキン室枠２１を周方向の分割構造としたので、グランドパッキン４の着脱、交換を極めて容易に行うことができ、保守点検も容易となり、保守のための停止時間を短縮することができる。又、グランドパッキン４の交換が容易となるので、グランドパッキン４が劣化して空気が浸入し、分解ガスが発火燃焼することを防止することができる。また、回転炉８の排出側に設けた突出部８ｂは回転支持ローラ１６と嵌合して位置が固定されており、スプロケット１７は回転炉８における突出部８ｂの近傍に設けられており、回転炉８が熱により膨張、収縮した場合でもスプロケット１７の位置はあまり変化せず、駆動源であるモータ１９との連結が容易となった。
【００１６】
なお、上記実施形態においては、回転炉８の一端側から投入された被処理物を
他端側から排出するようにしているが、この排出された被処理物を次段の回転炉に供給するようにしてもよい。
【００１７】
【発明の効果】
以上のようにこの発明によれば、パッキン部材の外周を包囲するパッキン室枠を周方向の分割構造としたので、パッキン部材の交換が容易となり、パッキン部材の劣化による空気の浸入による分解ガスの発火燃焼を防止することができるとともに、保守点検も容易となる。
【図面の簡単な説明】
【図１】この発明による回転炉加熱処理装置のシール部の縦断面図である。
【図２】この発明による回転炉加熱処理装置の正面図である。
【図３】この発明による回転炉加熱処理装置のパッキン室枠の部分縦断側面図である。
【図４】この発明による回転炉加熱処理装置のシール部の形成手順を示す図である。
【図５】従来の回転炉加熱処理装置のシール部の縦断面図である。
【図６】従来の回転炉加熱処理装置のシール部の形成手順を示す図である。
【符号の説明】
４…グランドパッキン
８…回転炉
９…外部加熱手段
１０…回転加熱処理炉
１１，１３…シール部
１２…投入ボックス
１４…排出ボックス
１４ｂ…パッキン係合部
１５，１６…回転支持ローラ
２１…パッキン室枠
２１ａ，２１ｂ，２５ｂ…突出部
２５…パッキン押さえ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary furnace heat treatment apparatus.
[0002]
[Prior art]
In general, heat treatment such as drying or pyrolysis (carbonization) is performed on various objects to be treated (various sludges, organic substances, scraps generated in production activities, etc.). In this method, an object to be processed is introduced into a rotary furnace, and the object to be processed is thermally decomposed and processed by indirect heating from the outside. The advantage of such indirect heating is that the material to be treated is not directly heated, but moisture is removed by thermal decomposition to obtain dry matter, or further heating to decompose and remove combustible volatile components to obtain carbide. Therefore, the characteristics of the material to be processed can be utilized. However, in indirect heating, since the intrusion of air into the rotary furnace is limited and decomposed, the airtightness of the seal portion positioned between the fixed members at both ends of the rotary furnace becomes important. In other words, if air enters without the seal part performing its function sufficiently, the decomposed combustible component will ignite and burn in the rotary furnace, causing damage to the device or stable heat treatment. Became difficult.
[0003]
As a rotary furnace heat treatment apparatus provided with this type of seal portion, there are Patent Document 1 and Patent Document 2, and the configuration shown in FIG. 8 of Patent Document 1 and FIG. 2 of Patent Document 2 is particularly common. . Accordingly, these configurations will be described with reference to FIG. 5. Reference numeral 1 denotes a cylindrical rotary furnace, and a heating means for heating the rotary furnace 1 is provided on the outer peripheral side thereof. Reference numeral 2 denotes a discharge box to which an object to be processed is fixed located at the end of the rotary furnace 1, and a seal portion is provided between the rotary furnace 1 and the discharge box 2 in order to prevent discharge of hot air and intrusion of external air. 3 is provided.
[0004]
In the seal portion 3, a cylindrical portion 2a is provided in the discharge box 2, and a packing engaging portion 2b projecting radially inward is provided at an axially outer end of the cylindrical portion 2a. A mounting portion 2c protruding radially outward is provided at the end. As shown in FIG. 6, a gland packing 4 is inserted between the cylindrical portion 2a and the rotary furnace 1 in the axial direction using a tool. 5 is a packing presser comprising a cylindrical part 5a having an outer diameter substantially equal to the inner diameter of the cylindrical part 2a and a protruding part 5b formed to protrude radially outward at the axially inner end of the cylindrical part 5a. As shown, the gland packing 4 is engaged with the cylindrical portion 5a of the packing retainer 5 and the packing by engaging the mounting screw 6 inserted into the insertion hole 5c provided in the protruding portion 5b with the female screw portion 2d of the mounting portion 2c. Hold between the joints 2b. Thus, the seal portion 3 is configured by the cylindrical portion 2a, the packing engaging portion 2b, the mounting portion 2c, the gland packing 4, the packing presser 5 and the mounting screw 6.
[0005]
[Patent Document 1]
JP-A-6-300453 (FIG. 8)
[0006]
[Patent Document 2]
JP-A-60-159585 (Fig. 2)
[0007]
[Problems to be solved by the invention]
However, in the conventional rotary furnace heat treatment apparatus described above, since the cylindrical portion 2a, the packing engaging portion 2b, and the mounting portion 2c of the discharge box 2 are integrally formed, it is easy to replace the gland packing 4. There wasn't. On the other hand, the gland packing 4 deteriorates unless it is periodically replaced. Air enters from this portion, and the decomposition gas is ignited and burned. Further, since the rotary furnace 1 expands and contracts as indicated by the arrow 7 due to heat, it is not easy to connect to a drive source that rotates the rotary furnace 1.
[0008]
The present invention has been made to solve the above-described problems, and can easily attach and detach the packing material of the seal portion, facilitate maintenance and inspection, and reduce the stop time. It aims at obtaining a furnace heat processing apparatus.
[0009]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a rotary furnace heat treatment apparatus in which an object to be processed is introduced from one end side of a rotary furnace that is rotatably supported through an input box, and the object to be processed is placed on the other end side of the rotary furnace. A rotary furnace heat treatment apparatus for performing heat treatment by indirect heating from the outer peripheral side of the rotary furnace, wherein the distance between the input or discharge box and the rotary furnace is In the rotary furnace heat treatment apparatus provided with a seal portion that hermetically seals the seal portion, the seal portion is provided on the outer periphery of the rotary furnace in a cylindrical shape in parallel with the outer periphery, and the packing member is provided in the box. A packing engaging portion that engages with the axial outer end portion , a packing chamber frame that surrounds the outer peripheral side of the packing member and that can be divided in the circumferential direction and is coupled to the packing engaging portion, and a packing chamber frame Combined and around The packing chamber frame is constituted by a packing presser that presses the packing member inside the packing chamber frame toward the outer end side in the rotary furnace axial direction , and annular protrusions are provided on both ends of the rotary furnace, and each protrusion is Each of the rotary support rollers is supported by a rotary support roller, and has a flange portion that fits with the protruding portion so that one of the rotary support rollers becomes a starting point of elongation of the rotary furnace during heating .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a front view of a rotary furnace heat treatment apparatus according to an embodiment of the present invention, and the rotary furnace 8 indirectly handles the object to be treated (such as sludge, organic substances, and scraps generated in production activities). It is possible to perform a drying process and a pyrolysis process by heating, and an external heating means 9 for heating the rotary furnace 8 from the outside is provided around the rotary furnace 8, and hot air gas is introduced into the external heating means 9. The hot air gas is exhausted and circulated after externally heating the rotary furnace 8. A rotary heat treatment furnace 10 is formed by the rotary furnace 8 and the external heating means 9, and is used as a drying furnace or a carbonization furnace.
[0011]
An input box 12 for processing objects is provided on one end side of the rotary furnace 8 via a seal portion 11, and a discharge box 14 is provided on the other end side of the rotary furnace 8 via a seal portion 13. A plurality of feed blades (not shown) for agitating and conveying the object to be processed are provided in 8. Further, annular protrusions 8a and 8b are provided at both ends of the rotary furnace 8, and the protrusions 8a and 8b are rotatably supported by rotation support rollers 15 and 16. The rotation support roller 16 is attached to the rotary furnace 8 during heating. Even if elongation occurs, flanges 16a are provided at both ends so that the discharge side of the rotary furnace 8 serves as a base point of elongation, and is fitted with the protruding portion 8b. For this reason, the rotary furnace 8 extends mainly to the charging box 12 side. However, the rotary furnace 8 extends slightly to the discharge side. Further, a sprocket 17 is provided on the end side of the protruding portion 8b in the rotary furnace 8, and the chain 18 engaged with the sprocket 17 is engaged with a sprocket 20 attached to a motor 19 as a drive source.
[0012]
The workpiece to be processed fed from the charging box 12 is introduced into the rotary furnace 8 through the guide 27. The rotary furnace 8 is rotationally driven by a motor 19, and the workpiece introduced into the rotary furnace 8 is transferred to the discharge side while being stirred. As described above, the inside of the rotary furnace 8 is heated to a predetermined temperature by hot air gas, and the object to be treated is dried (moisture removed) by indirect heating to become a dried substance, and this dried substance is further pyrolyzed (carbonized) by indirect heating. The dried product and carbide are taken out as processed products through the discharge box 14. Further, gas to be treated such as water vapor, pyrolysis gas, combustible components, etc. generated in the rotary furnace 8 is also taken out through the discharge box 14.
[0013]
FIG. 1 is a longitudinal sectional view of the seal portion 13. A cylindrical portion 14 a having a diameter slightly larger than the outer diameter of the rotary furnace 8 is formed in the discharge box 14 so as to protrude inward in the axial direction. A packing engaging portion 14b protruding outward in the radial direction is formed. Reference numeral 21 denotes a cylindrical packing chamber frame that surrounds the outer periphery of the gland packing 4 that engages with the outer periphery of the rotary furnace 8. Protrusions 21a and 21b that protrude radially outward are provided at the inner and outer ends in the axial direction. It is done. As shown in FIG. 3, the packing chamber frame 21 is divided into a plurality of pieces in the circumferential direction to form divided pieces 22, and the connecting portions 22 a erected on the protruding portions 21 b are connected by bolts 23, thereby 21 are combined in a ring shape. An insertion hole 21c is formed in the protruding portion 21b, and the bolt 24 inserted through the insertion hole 21c is screwed into the female screw portion 14c provided in the packing engaging portion 14b, whereby the packing engaging portion 14b and the protruding portion 21b are Combined. 25 is a packing presser comprising a cylindrical portion 25a having an outer diameter substantially equal to the inner diameter of the packing chamber frame 21, and a protruding portion 25b formed to protrude radially outward at the axially inner end of the cylindrical portion 25a. The bolts 26 inserted into the insertion holes 25c provided in the portion 25b are screwed into the female screw portions 21d provided in the protruding portions 21a of the packing chamber frame 21, whereby the packing presser 25 and the packing chamber frame 21 are coupled. The The packing retainer 25 is also divided into a plurality of parts in the circumferential direction, and can be integrated. The seal portion 11 has the same structure as the seal portion 13.
[0014]
Next, a procedure for forming the seal portion 13 will be described with reference to FIG. First, a plurality of gland packings 4 are wound around the outer periphery of the rotary furnace 8, and the end portions thereof are temporarily fixed with an adhesive tape. Next, the divided pieces 22 of the packing chamber frame 21 are arranged on the outer periphery of the gland packing 4, and are integrated and mounted as the packing chamber frame 21, and the bolts 24 are inserted into the insertion holes 21c so that the female threads of the packing engaging portion 14b are inserted. The packing engaging portion 14b and the packing chamber frame 21 are coupled with each other by screwing into the portion 14c. Next, the packing retainer 25 having a divided structure is integrated on the outer periphery of the rotary furnace 8, and the bolt 26 inserted through the insertion hole 25c is screwed into the female screw portion 21d of the packing chamber frame 21, thereby bringing the gland packing 4 outward in the axial direction. The packing presser 25 and the packing chamber frame 21 are joined together.
[0015]
In the above embodiment, the packing chamber frame 21 that surrounds the outer periphery of the gland packing 4 has a circumferentially divided structure, so that the gland packing 4 can be attached and detached and replaced very easily, and maintenance and inspection are also facilitated. Maintenance downtime can be shortened. Further, since the gland packing 4 can be easily replaced, it is possible to prevent the gland packing 4 from deteriorating and air from entering, and the decomposition gas from being ignited and burned. Further, the projecting portion 8b provided on the discharge side of the rotary furnace 8 is fitted to the rotation support roller 16 to be fixed in position, and the sprocket 17 is provided in the vicinity of the projecting portion 8b in the rotary furnace 8, and rotates. Even when the furnace 8 expands and contracts due to heat, the position of the sprocket 17 does not change so much, and the connection with the motor 19 which is a drive source becomes easy.
[0016]
In the above embodiment, the object to be processed input from one end side of the rotary furnace 8 is discharged from the other end side. The discharged object to be processed is supplied to the next-stage rotary furnace. You may do it.
[0017]
【The invention's effect】
As described above, according to the present invention, since the packing chamber frame surrounding the outer periphery of the packing member has a circumferentially divided structure, the packing member can be easily replaced, and the decomposition gas due to the intrusion of air due to deterioration of the packing member can be obtained. In addition to preventing ignition and combustion, maintenance and inspection are also facilitated.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a seal portion of a rotary furnace heat treatment apparatus according to the present invention.
FIG. 2 is a front view of a rotary furnace heat treatment apparatus according to the present invention.
FIG. 3 is a partially longitudinal side view of the packing chamber frame of the rotary furnace heat treatment apparatus according to the present invention.
FIG. 4 is a diagram showing a procedure for forming a seal portion of the rotary furnace heat treatment apparatus according to the present invention.
FIG. 5 is a longitudinal sectional view of a seal portion of a conventional rotary furnace heat treatment apparatus.
FIG. 6 is a diagram showing a procedure for forming a seal portion of a conventional rotary furnace heat treatment apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 4 ... Gland packing 8 ... Rotary furnace 9 ... External heating means 10 ... Rotary heat processing furnace 11, 13 ... Sealing part 12 ... Input box 14 ... Discharge box 14b ... Packing engagement part 15, 16 ... Rotation support roller 21 ... Packing chamber Frame 21a, 21b, 25b ... Projection 25 ... Packing presser

Claims

A workpiece is introduced from one end side of a rotary furnace that is rotatably supported through a charging box, and the workpiece is discharged from the other end side of the rotary furnace through a discharge box or moved to the next rotary furnace, A rotary furnace heat treatment apparatus for performing heat treatment by indirect heating from the outer peripheral side of the rotary furnace, the rotary furnace heat treatment apparatus having a seal portion that hermetically seals the interval between the input or discharge box and the rotary furnace A seal member that is engaged with the outer periphery of the rotary furnace in a cylindrical shape in parallel with the outer periphery, and a packing engaging portion that is provided on the box and that engages with an outer axial end of the packing member. A packing chamber frame that surrounds the outer peripheral side of the packing member and is separable in the circumferential direction and is coupled to the packing engaging portion; and is coupled to the packing chamber frame and is separable in the circumferential direction; Inside Constituted by a packing gland which presses the down member to the rotating furnace axially outer end side, and the projecting portion of the annular provided on both ends of the rotary furnace, as well as supported by the respective rotary support rollers each protruding portion, of one A rotary furnace heat treatment apparatus characterized in that the rotary support roller has a flange that fits with the protrusion so as to be a starting point of elongation of the rotary furnace during heating.