JP2005069504A - Rotary heat treatment facility - Google Patents

Rotary heat treatment facility Download PDF

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Publication number
JP2005069504A
JP2005069504A JP2003209051A JP2003209051A JP2005069504A JP 2005069504 A JP2005069504 A JP 2005069504A JP 2003209051 A JP2003209051 A JP 2003209051A JP 2003209051 A JP2003209051 A JP 2003209051A JP 2005069504 A JP2005069504 A JP 2005069504A
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JP
Japan
Prior art keywords
rotary kiln
heat treatment
rotary
support
seal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2003209051A
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Japanese (ja)
Inventor
Yoshiyuki Kashiwagi
佳行 柏木
Hiroyuki Ishikawa
博之 石川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Tokai Techno Co Ltd
Original Assignee
Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
Tokai Techno Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Meidensha Corp, Meidensha Electric Manufacturing Co Ltd, Tokai Techno Co Ltd filed Critical Meidensha Corp
Priority to JP2003209051A priority Critical patent/JP2005069504A/en
Publication of JP2005069504A publication Critical patent/JP2005069504A/en
Pending legal-status Critical Current

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  • Rolls And Other Rotary Bodies (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Processing Of Solid Wastes (AREA)
  • Treatment Of Sludge (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Furnace Details (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide stable heat decomposition treatment to subject matter by securing a stable seal function between a rotary kiln and a seal part. <P>SOLUTION: A connection duct 5 is provided for introducing subject matter on one end side of the rotary kiln 1, and a connection duct 7 for recovering subject matter and discharging generated gas is provided on the other end side of the rotary kiln 1. An external heating means 2 to indirectly heat the rotary kiln 1 from the external is provided, and seal parts 4 and 6 are provided to seal the outer circumference of the rotary kiln 1 to the connection ducts 5 and 7. Circular support tires 21 and 22 are provided on both axial direction sides of the rotary kiln 1, and support rollers 23 and 24 in the form of a truncated cone are provided to rotatably support the support tires 21 and 22. Outer circumferential surfaces of the support tires 21 and 22 are set as inclined surfaces that are larger on the end part side of the rotary kiln 1 and smaller on the other part side. Outer circumferential surfaces of the support rollers 23 and 24 are set as inclined surfaces that are smaller on the end part side of the rotary kiln 1, and larger on the other part side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
この発明は、各種の被処理物(各種の有機性・無機性の廃棄物、汚泥、土壌、土砂など)を原料とし、この原料を加熱処理して水分、有機性物質を除去し、乾燥物、炭化物などに加工処理することにより、循環資源材料として有効活用するための回転加熱処理設備に関するものである。
【0002】
【従来の技術】
各種の被処理物(各種の有機性・無機性廃棄物、汚泥、土壌、土砂など)を間接加熱により水分、有機性物質を除去し、乾燥物、炭化物などに加工して再利用することが行われている。図6はこのような加工を行うための従来の回転加熱処理設備の概略正面図を示し、回転キルン1は被処理物(原料)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、回転キルン1の周囲には回転キルン1を外部から加熱する外部加熱手段2が設けられ、外部加熱手段2内には熱風ガスなどの加熱媒体が導入され、この加熱媒体は回転キルン1を外部加熱した後、排出、循環される。回転キルン1と外部加熱手段2とにより回転加熱処理炉3が形成される。
【0003】
回転キルン1の一端側にはシール部4を介して被処理物導入のための接続ダクト5が設けられ、回転キルン1の他端側には同じくシール部6を介して処理物回収などのための接続ダクト7が設けられ、回転キルン1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。シール部4,6は回転キルン1の外周と接続ダクト5,7との間を気密にシールする。8は被処理物から発生した水蒸気ガス、分解ガスなどの発生ガスを吸引する排気ブロアであり、発生ガスは分解ガス燃焼炉9、熱交換機10、バグフィルタ11及び排気ブロア8を介して煙突から排出される。
【0004】
又、回転キルン1の軸方向両側の外周にリング状の支持タイヤ12,13が設けられ、支持タイヤ12,13は支持ローラ14,15により回転自在に支持され、基点側の支持ローラ15は加熱時回転キルン1に軸方向の伸びが生じても回転キルン1の処理物回収側が伸びの基点となるように軸方向両端に鍔部15aが設けられ、鍔部15aは支持タイヤ13と係合可能となっている。フリー側の支持ローラ14には、鍔部は設けられていない。このため、回転キルン1は加熱時主にシール部4側に伸び、シール部6側にも少し伸びる。又、回転キルン1の支持タイヤ13のさらに端部側にはスプロケット16が設けられ、スプロケット16と係合したチェーン17は駆動源であるモータ18に取り付けられたスプロケット19と係合する。
【0005】
接続ダクト5から導入された被処理物(原料、例えば、含水率約85%の脱水汚泥)は、ガイド20を介して回転キルン1内に導入される。回転キルン1はモータ18により回転駆動され、回転キルン1内に導入された原料は攪拌されながら回収側へ搬送される。回転キルン1内は350〜650℃の熱風ガスにより加熱され、原料は間接加熱により乾燥(水分除去)されて乾燥物となり、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接続ダクト7を介して処理物として回収され、又は次工程へ送られる。
【0006】
又、回転キルン1内の原料は加熱により水蒸気ガス、分解ガスを発生し、この発生ガスは分解ガス燃焼炉9において800℃以上、2秒以上の燃焼により浄化され、熱交換機10においては熱風又は蒸気に置換され熱回収されて利用され、バグフィルタ11において煤塵などを除去されて浄化され、排気ブロア8を介して煙突から排出される。
【0007】
上記した従来の回転加熱処理設備においては、回転キルン1内で発生した水蒸気ガス、分解ガスを排気ブロア8で吸引することにより、回転キルン1内を負圧の状態に維持して、発生ガスを排出している。負圧状態であることからシール部4,6が重要であり、シール機能が低下すると、シール部4,6から回転キルン1内への空気の浸入があり、発生ガスの燃焼により設備が損傷し、安定した加熱処理を行うことが困難となった。そこで、この種設備では、シール機構の研究が鋭意行われており、例えば特許文献1には各種形態のシール機構が示されている。
【0008】
特許文献1の図7のシール機構においては、接続ダクトに取り付けられたブラシを回転キルンに当接させてシールしており、接続ダクトと回転キルンとは離間しているので、回転キルンの軸振れ変位による影響を接続ダクト及びブラシは受けないが、ブラシと回転キルンとの接触抵抗によるシールであることから、シール特性は高いものとはいえない。又、特許文献1の図8のシール機構においては、接続ダクトと回転キルンとの間にグランドパッキンを介在させてシールしており、良好なシール効果は得られるが、回転キルンの軸振れ変位に対する追従性が悪く、またグランドパッキンは回転キルンとの接触抵抗が大きく、摩耗が早い。さらに、特許文献1の図9のシール機構においては、接続ダクトに取り付けた環状ガスケットを回転キルンにコイルスプリングにより圧接させてシールしており、接続ダクトと回転キルンとは離間しているので、回転キルンの軸振れ変位による影響を接続ダクト及び環状ガスケットは受けないが、環状ガスケットはコイルスプリングの弾性力による回転キルンとの接触抵抗によりシールしているので、コイルスプリングで押圧されている部分が局部的に摩耗し、シール特性は高いものとはいえない。
【0009】
【特許文献1】
特許第3400818号公報
【0010】
【発明が解決しようとする課題】
そこで、発明者は、特許文献1の図8のようなグランドパッキンによるシール特性を確保しつつ欠点を解消すべく鋭意研究を行った。その結果、加熱時においては回転キルンは径方向及び軸方向に膨張し、回転キルンの回転中心軸が常温時と加熱時とでは変位し、回転キルンとシール機構との間に新たな隙間が生じることに着目した。
【0011】
即ち、図7(a),(b)は回転加熱処理設備の原料導入側部分の常温時及び加熱時(350〜650℃)の概略拡大正面図を示し、図8(a),(b)は同じく常温時及び加熱時の概略拡大側面図を示し、図7(a)、図8(a)に示す常温時においては、加熱により回転キルン1は径方向に膨張すること、及び回転キルン1はベース枠に回転自在に固定された支持ローラ14上に支持されていることから、回転キルン1の上部側においては回転キルン1の膨張を吸収できるように、シール部4と回転キルン1との間に隙間Aを持たせておく。回転キルン1の下部側においては、回転キルン1の外周面とシール部4の内周面とは接触している。次に、図7(b)及び図8(b)に示す加熱時においては、回転キルン1は熱膨張により外径が大きくなり、支持ローラ14上の回転キルン1の回転中心軸はBに示す常温時からCに示す加熱時へと上昇する。このため、回転キルン1の上部側においては回転キルン1の外周面とシール部4の内周面とが接触し、所定のシール機能を惹起することとなる。しかし、回転キルン1の下部側においては、回転キルン1の外周面とシール部4の内周面との間に隙間Dが生じることになる。これらのことは、回転加熱処理設備のシール部6側においても、回転キルン1とシール部6との関係において同様である。従って、加熱時回転キルン1の下部側においては、回転キルン1の外周面とシール部4,6の内周面との間に隙間Dが生じ、シール機能が低下して空気が浸入し、安定した熱分解処理が困難となった。
【0012】
そこで、発明者は回転キルン1とシール部4,6との関係が常温時、加熱時の何れにおいても均一な接触関係を確保できるように、加熱による回転キルン1の外径の膨張に応じて回転キルン1の回転中心とシール部4,6の中心とが一定の関係を維持できるようにした。即ち、従来の支持タイヤ12,13と支持ローラ14,15との関係を前提とした場合には、加熱時回転キルン1の回転中心は上昇し、シール部4,6は上部側では回転キルン1と強く接触して劣化し、空気の浸入が生じ、また下部側では回転キルン1とシール部4,6との間に隙間Dが生じ、空気の浸入が生じた。このような現象は特許文献1の図1、図9に示されたシール構造の場合にも生じる現象であり、やはり回転キルンの回転中心が上昇すると、環状ガスケットのフランジに偏倚力が作用し、シール劣化の原因となった。
【0013】
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、回転キルンとシール部との接触関係を一定に確保することができ、安定したシール機能を確保することができ、安定した熱分解処理を行うことができる回転加熱処理設備を得ることを目的とする。
【0014】
【課題を解決するための手段】
発明者は、回転キルンの外周に設けられた支持タイヤの外周面を傾斜面(テーパ面)とし、加熱により回転キルンが膨張した際に、回転キルンの回転中心とシール部の中心との関係が不変な関係となるようにした。
【0015】
この発明の請求項1に係る回転加熱処理設備は、回転キルンの両端に設けられ、原料の導入、処理物の回収、発生ガスの排出を行う接続ダクトと、回転キルンを外部から間接加熱する加熱手段と、回転キルンの外周と接続ダクトとの間に設けられ、この間を気密にシールするシール部とを備え、回転キルンの一端側から投入した原料を間接加熱しながら攪拌と搬送を行って他端側から回収し、加熱された原料から発生する分解ガスを吸引排出する回転加熱処理設備において、回転キルンの軸方向両側の外周に装着されたリング状の支持タイヤと、支持タイヤを回転自在に支持する支持ローラとを備え、支持タイヤの外周面を、回転キルンの両端側を径大とするとともに反端部側を径小とする傾斜面とし、かつ支持ローラの外周面を支持タイヤの傾斜外周面と平行にしたものである。
【0016】
請求項2に係る回転加熱処理設備は、支持ローラを円錐台形状とし、支持ローラの外周面を、回転キルンの両端側を径小とするとともに反端部側を径大とする傾斜面としたものである。
【0017】
請求項3に係る回転加熱処理設備は、支持ローラを円柱形状とし、この支持ローラを支持タイヤの傾斜外周面と平行に配置したものである。
【0018】
請求項4に係る回転加熱処理設備は、シール部の回転キルンの外周と対応するシール部材が、グランドパッキンであるものである。
【0019】
請求項5に係る回転加熱処理設備は、シール部の回転キルンの外周と対応するシール部材が、環状ガスケットであるものである。
【0020】
【発明の実施の形態】
実施形態1
以下、この発明の実施の形態を図面とともに説明する。図1はこの発明の実施形態1による回転加熱処理設備の概略正面図を示し、回転キルン1の軸方向両側の外周にリング状の支持タイヤ21,22を突出して設け、支持タイヤ21,22の外周面は、回転キルン1の両端側が径大で反端部側を径小とする傾斜面とした。又、支持タイヤ21,22を回転自在に支持する支持ローラ23,24は円錐台形状とし、その外周面は回転キルン1の両端側を径小とするとともに反端部側を径大とする傾斜面とし、この傾斜面は支持タイヤ21,22の傾斜面と平行とする。又、基点側の支持ローラ24には、加熱時回転キルン1に軸方向の伸びが生じても回転キルン1の処理物回収側が伸びの基点となるように軸方向両端に鍔部24aが設けられ、鍔部24aは支持タイヤ22と係合可能となっている。その他の構成は従来と同様である。
【0021】
図2はシール部4の拡大断面図を示し、導入側の接続ダクト5の端部には円筒部5aが設けられ、円筒部5aの軸方向内端には径方向内方に突出したパッキン係合部5bが設けられ、円筒部5aの軸方向外端には径方向外方に突出した取付部5cが設けられる。一方、回転キルン1の外周にはシール対応部1aが設けられ、円筒部5aとシール対応部1aとの間にはグランドパッキン25が設けられる。26は外径が円筒部5aの内径にほぼ等しい円筒部26aと円筒部26aの軸方向外端に径方向外方に突出して形成された突出部26bとから成るパッキン押さえであり、パッキン押さえ26は周方向の二分割構造となっており、突出部26bと取付部5cとはボルト27により連結される。グランドパッキン25はパッキン係合部5bとパッキン押さえ26との間に保持される。シール部6もシール部4と同様の構造となっている。
【0022】
上記構成において、接続ダクト5から原料として例えば含水率約85%の脱水汚泥を導入すると、脱水汚泥はガイド20を介して回転キルン1内に導入される。回転キルン1はモータ18により回転駆動され、回転キルン1内に導入された原料は攪拌されながら回収側へ搬送される。回転キルン1内は熱風ガスにより加熱され、原料は間接加熱により乾燥(水分除去)されて乾燥物となり、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接続ダクト7を介して処理物として回収され、又は次工程へ送られる。乾燥、炭化を単一の回転キルン1で行う場合には、熱風ガスの温度は350〜650℃で1〜2時間加熱し、乾燥、炭化を別々の回転キルン1で行う場合には、乾燥は150〜350℃の熱風ガスで加熱し、炭化は450〜650℃の熱風ガスにより加熱する。
【0023】
回転キルン1内の原料は加熱により水蒸気ガス、分解ガスなどのガスを発生し、この発生ガスは接続ダクト7を介して分解ガス燃焼炉9へ導入され、800℃以上、2秒以上の燃焼処理により無害化される。この燃焼された排ガスは熱交換機10において空気との熱交換により熱風や蒸気に置換され、得た熱風は熱風炉に導入して利用し、熱風発生用燃料の削減に寄与する。又、排ガスは熱交換機10において200〜150℃に冷却され、バグフィルタ11においては煤煙などが除去されて浄化され、排気ブロア8により吸引されて煙突から排出される。
【0024】
図3(a),(b)は回転加熱処理設備の原料導入側部分の常温時及び加熱時における概略拡大正面図を示し、図3(a)の常温時においてはシール部4の内周面と回転キルン1の外周面との間は全周において当接させるかあるいは微小な隙間を設けておく。次に、図3(b)に示す加熱時においては、回転キルン1は径方向に膨張するので、外径が大きくなり、回転中心は上昇する。しかし、一方では支持タイヤ21と支持ローラ23とは同一のテーパ面で係合しているので、加熱により回転キルン1が軸方向に伸びると、回転キルン1は支持ローラ23上を矢印28のように移動し、その回転中心が下降する方向に移動する。従って、これらの総合作用により回転キルン1の回転中心は上昇も下降もせず、回転キルン1の外径が膨張した分だけ回転キルン1とシール部4との間は接近して全周において均一な接触状態となり、シール効果は確実に惹起される。
【0025】
図4は回転加熱処理設備の処理物回収側部分の常温時の概略拡大正面図を示し、シール部6の内周面と回転キルン1の外周面との間は全周においてほぼ均等とし、当接させるかあるいは微小な隙間を設けておく。加熱時においては、回転キルン1は径方向に膨張するとともに、軸方向においても支持タイヤ22と支持ローラ24の鍔部24aとの係合により制約されるが、ある程度は伸びる。このため、径方向の膨張においては回転キルン1の回転中心は上昇する方向であり、軸方向の伸びにおいては支持タイヤ22と支持ローラ24とはテーパ面で係合しているので、回転キルン1の回転中心は下降する方向である。従って、シール部6側においても、回転キルン1の回転中心はほとんど上昇も下降もせず、回転キルン1の外径の膨張によりシール部6と回転キルン1との間隔は多少狭まる方向で全周均一に当接し、良好なシール効果を奏する。
【0026】
実施形態1においては、支持タイヤ21,22の外周面を、回転キルン1の両端側を径大とするとともに反端部側を径小とする傾斜面とし、かつ支持ローラ23,24の外周面を回転キルン1の両端側を径小とするとともに反端部側を径大とする傾斜面としており、加熱時回転キルン1の径方向の膨張により回転キルン1の回転中心は上昇する方向であるが、一方では回転キルン1が軸方向に伸びることにより回転キルン1の回転中心は下降する方向となり、結局回転キルン1の回転中心は下降も上昇もせず、シール部4,6の中心との関係は不変となり、回転キルン1とシール部4,6との接触関係を一定に確保することができ、安定したシール機能を確保することができ、安定した熱分解処理を行うことができる。又、シール部4,6に無理な偏倚力が加わることもなく、安定したシール機能が得られる。さらに、支持タイヤ21,22と支持ローラ23,24の傾斜面同士の接触であるから、回転キルン1はその伸縮に応じて円滑に移動することができ、回転キルン1とシール部4,6との間に安定した接触関係を維持することができる。
【0027】
実施形態2
図5は実施形態2による回転加熱処理設備の原料導入側部分の概略正面図を示し、支持タイヤ21を回転自在に支持する支持ローラ29を円柱形状とし、この支持ローラ29を支持タイヤ21の傾斜外周面と平行に配置している。支持タイヤ22を回転自在に支持する支持ローラ(図示せず)も同様に形成されている。その他の構成は実施形態1と同様である。実施形態2においても、加熱時回転キルン1の径方向の膨張により回転中心は上昇方向となるが、回転キルン1の伸びにより回転キルン1の回転中心は下降方向となり、結局回転中心は不変となり、加熱時に良好なシール機能が得られる。
【0028】
実施形態3
実施形態1,2ではシール部4,6の回転キルン1の外周と対応するシール部材をグランドパッキン25としたが、実施形態3ではシール部材を環状ガスケットとする。このような構造であっても実施形態1,2と同様な効果を奏する。
【0029】
【発明の効果】
以上のようにこの発明によれば、回転キルンに装着した支持タイヤの外周面を、回転キルンの両端側を径大とするとともに反端部側を径小とする傾斜面とし、かつ支持ローラの外周面を支持タイヤの傾斜外周面と平行としている。このため、回転キルンは加熱時径方向の膨張により回転中心が上昇方向となるが、軸方向の伸びにより回転中心が下降方向となるので、結局回転中心はほぼ不変となり、シール部の中心との関係も不変となり、回転キルンとシール部との接触関係を一定に確保することができ、安定したシール機能を確保することができ、安定した熱分解処理を行うことができる。又、回転キルンの回転中心とシール部の中心との関係が不変であるから、シール部に無理な偏倚力が加わることもなく、安定したシール機能が得られる。さらに、支持ローラの外周面は支持タイヤの傾斜外周面と平行にしたので、回転キルンはその伸縮に応じて円滑に移動することができ、回転キルンとシール部との間にも安定した接触関係を維持することができる。
【0030】
支持ローラは円錐台状とし、その外周面を、回転キルンの端部側を径小とするとともに反端部側を径大とする傾斜面としてもよく、また支持ローラを円柱形状とし、この支持ローラを支持タイヤの傾斜外周面と平行に配置してもよい。又、シール部における回転キルンの外周と対応するシール部材をグランドパッキンとしてもよく、環状ガスケットとしてもよい。
【図面の簡単な説明】
【図1】この発明の実施形態1による回転加熱処理設備の概略正面図である。
【図2】この発明の実施形態1による回転加熱処理設備のシール部の拡大断面図である。
【図3】実施形態1による回転加熱処理設備の原料導入側部分の常温時及び加熱時の概略拡大正面図である。
【図4】実施形態1による回転加熱処理設備の処理物回収側部分の常温時の概略拡大正面図である。
【図5】実施形態2による回転加熱処理設備の原料導入側部分の概略正面図である。
【図6】従来の回転加熱処理設備の概略正面図である。
【図7】従来の回転加熱処理設備の原料導入側部分の常温時及び加熱時の概略拡大正面図である。
【図8】従来の回転加熱処理設備の原料導入側部分の常温時及び加熱時の概略拡大側面図である。
【符号の説明】
1…回転キルン
2…外部加熱手段
4,6…シール部
5,7…接続ダクト
8…排気ブロア
18…モータ
21,22…支持タイヤ
23,24,29…支持ローラ
25…グランドパッキン
[0001]
BACKGROUND OF THE INVENTION
This invention uses various materials to be treated (various organic and inorganic wastes, sludge, soil, earth and sand, etc.) as raw materials, heat-treats these raw materials to remove moisture and organic substances, and dry matter The present invention relates to a rotary heat treatment facility for effective utilization as a circulating resource material by processing it into carbides.
[0002]
[Prior art]
It is possible to remove water and organic substances from various objects to be treated (various organic and inorganic wastes, sludge, soil, earth and sand, etc.) by indirect heating, process them into dried products, carbides, etc., and reuse them. Has been done. FIG. 6 shows a schematic front view of a conventional rotary heat treatment facility for performing such processing, and the rotary kiln 1 can dry and pyrolyze a workpiece (raw material) by indirect heating. An external heating means 2 for heating the rotary kiln 1 from the outside is provided around the rotary kiln 1, and a heating medium such as hot air gas is introduced into the external heating means 2, and the heating medium passes the rotary kiln 1 to the outside. After heating, it is discharged and circulated. A rotary heat treatment furnace 3 is formed by the rotary kiln 1 and the external heating means 2.
[0003]
A connection duct 5 for introducing an object to be processed is provided on one end side of the rotary kiln 1 via a seal portion 4, and the other end side of the rotary kiln 1 is also used for recovering a processed material via a seal portion 6. And a plurality of feed blades (not shown) for agitating and conveying the object to be processed are provided in the rotary kiln 1. The seal portions 4 and 6 hermetically seal between the outer periphery of the rotary kiln 1 and the connection ducts 5 and 7. Reference numeral 8 denotes an exhaust blower that sucks generated gas such as water vapor gas and cracked gas generated from the object to be processed. The generated gas is discharged from the chimney through the cracked gas combustion furnace 9, the heat exchanger 10, the bag filter 11, and the exhaust blower 8. Discharged.
[0004]
Further, ring-shaped support tires 12 and 13 are provided on the outer circumferences on both sides in the axial direction of the rotary kiln 1, the support tires 12 and 13 are rotatably supported by support rollers 14 and 15, and the base side support roller 15 is heated. Even if the axial rotation of the rotary kiln 1 occurs in the axial direction, the flanges 15a are provided at both ends in the axial direction so that the processed material collection side of the rotary kiln 1 is the starting point of the elongation, and the flanges 15a can be engaged with the support tire 13 It has become. The support roller 14 on the free side is not provided with a collar portion. For this reason, the rotary kiln 1 mainly extends to the seal portion 4 side during heating and slightly extends to the seal portion 6 side. Further, a sprocket 16 is provided on the further end side of the support tire 13 of the rotary kiln 1, and the chain 17 engaged with the sprocket 16 is engaged with a sprocket 19 attached to a motor 18 as a drive source.
[0005]
An object to be treated introduced from the connection duct 5 (raw material, for example, dehydrated sludge having a water content of about 85%) is introduced into the rotary kiln 1 through the guide 20. The rotary kiln 1 is rotationally driven by a motor 18, and the raw material introduced into the rotary kiln 1 is conveyed to the collection side while being stirred. The inside of the rotary kiln 1 is heated by hot air gas at 350 to 650 ° C., and the raw material is dried by indirect heating (moisture removal) to become a dried product, and this dried product is further pyrolyzed (carbonized) by indirect heating to be a carbide. Thus, these dry matter and carbide are recovered as a processed product through the connection duct 7 or sent to the next step.
[0006]
The raw material in the rotary kiln 1 generates steam gas and cracked gas by heating, and the generated gas is purified by combustion in the cracked gas combustion furnace 9 for 800 ° C. or more for 2 seconds or more. In the heat exchanger 10, hot air or It is replaced with steam and recovered and used, and dust and the like are removed and purified by the bag filter 11 and discharged from the chimney through the exhaust blower 8.
[0007]
In the conventional rotary heat treatment equipment described above, the steam gas and cracked gas generated in the rotary kiln 1 are sucked by the exhaust blower 8 so that the rotary kiln 1 is maintained at a negative pressure, and the generated gas is discharged. It is discharging. The seals 4 and 6 are important because they are in a negative pressure state. When the sealing function is lowered, air enters the rotary kiln 1 from the seals 4 and 6 and the equipment is damaged by the combustion of the generated gas. It has become difficult to perform stable heat treatment. Therefore, in this type of equipment, research on a sealing mechanism has been conducted intensively. For example, Patent Document 1 discloses various types of sealing mechanisms.
[0008]
In the seal mechanism shown in FIG. 7 of Patent Document 1, the brush attached to the connection duct is sealed against the rotary kiln, and the connection duct and the rotary kiln are separated from each other. Although the connection duct and the brush are not affected by the displacement, since the seal is based on the contact resistance between the brush and the rotary kiln, the sealing characteristics are not high. Further, in the sealing mechanism of FIG. 8 of Patent Document 1, a gland packing is interposed between the connection duct and the rotary kiln, and a good sealing effect can be obtained. The followability is poor, and the gland packing has high contact resistance with the rotary kiln and wears quickly. Furthermore, in the sealing mechanism of FIG. 9 of Patent Document 1, the annular gasket attached to the connection duct is sealed by pressing the rotary kiln with a coil spring, and the connection duct and the rotary kiln are separated from each other. The connection duct and the annular gasket are not affected by the axial displacement of the kiln, but the annular gasket is sealed by the contact resistance with the rotating kiln due to the elastic force of the coil spring, so the part pressed by the coil spring is locally Wears and the sealing properties are not high.
[0009]
[Patent Document 1]
Japanese Patent No. 3400818 [0010]
[Problems to be solved by the invention]
Therefore, the inventor conducted earnest research to eliminate the drawbacks while securing the sealing characteristics by the gland packing as shown in FIG. As a result, the rotary kiln expands in the radial and axial directions during heating, and the rotational central axis of the rotary kiln is displaced between normal temperature and heating, creating a new gap between the rotary kiln and the sealing mechanism. Focused on that.
[0011]
That is, FIGS. 7A and 7B are schematic enlarged front views of the raw material introduction side portion of the rotary heat treatment equipment at normal temperature and during heating (350 to 650 ° C.), and FIGS. Shows a schematic enlarged side view at normal temperature and during heating, and at normal temperature shown in FIGS. 7A and 8A, the rotary kiln 1 expands in the radial direction by heating, and the rotary kiln 1 Is supported on a support roller 14 that is rotatably fixed to the base frame, so that the seal 4 and the rotary kiln 1 can be absorbed on the upper side of the rotary kiln 1 so that the expansion of the rotary kiln 1 can be absorbed. A gap A is provided between them. On the lower side of the rotary kiln 1, the outer peripheral surface of the rotary kiln 1 and the inner peripheral surface of the seal portion 4 are in contact. Next, at the time of heating shown in FIGS. 7B and 8B, the outer diameter of the rotary kiln 1 increases due to thermal expansion, and the rotation center axis of the rotary kiln 1 on the support roller 14 is indicated by B. The temperature rises from room temperature to the heating shown in C. For this reason, on the upper side of the rotary kiln 1, the outer peripheral surface of the rotary kiln 1 and the inner peripheral surface of the seal portion 4 come into contact with each other, thereby causing a predetermined sealing function. However, on the lower side of the rotary kiln 1, a gap D is generated between the outer peripheral surface of the rotary kiln 1 and the inner peripheral surface of the seal portion 4. These are the same in the relationship between the rotary kiln 1 and the seal part 6 also on the seal part 6 side of the rotary heat treatment equipment. Therefore, on the lower side of the rotating kiln 1 during heating, a gap D is formed between the outer peripheral surface of the rotating kiln 1 and the inner peripheral surfaces of the seal portions 4 and 6, and the sealing function is lowered and air enters and is stable. The pyrolysis process became difficult.
[0012]
Therefore, the inventor responds to the expansion of the outer diameter of the rotary kiln 1 by heating so that the relationship between the rotary kiln 1 and the seal portions 4 and 6 can ensure a uniform contact relationship both at normal temperature and during heating. The rotation center of the rotary kiln 1 and the centers of the seal portions 4 and 6 can be maintained in a fixed relationship. That is, when the relationship between the conventional support tires 12 and 13 and the support rollers 14 and 15 is assumed, the rotation center of the rotary kiln 1 during heating rises, and the seal portions 4 and 6 are on the upper side of the rotary kiln 1. It deteriorated due to strong contact with the air, and intrusion of air occurred. On the lower side, a gap D was formed between the rotary kiln 1 and the seal portions 4 and 6, and air intrusion occurred. Such a phenomenon is also a phenomenon that occurs in the case of the seal structure shown in FIGS. 1 and 9 of Patent Document 1, and when the rotation center of the rotary kiln is raised, a biasing force acts on the flange of the annular gasket, Caused seal deterioration.
[0013]
The present invention has been made to solve the above-described problems, and can ensure a constant contact relationship between the rotary kiln and the seal portion, can ensure a stable sealing function, and is stable. An object of the present invention is to obtain a rotary heat treatment facility capable of performing the thermal decomposition treatment.
[0014]
[Means for Solving the Problems]
The inventor makes the outer peripheral surface of the support tire provided on the outer periphery of the rotary kiln an inclined surface (tapered surface), and when the rotary kiln is expanded by heating, the relationship between the rotation center of the rotary kiln and the center of the seal portion is I tried to be an immutable relationship.
[0015]
A rotary heat treatment facility according to claim 1 of the present invention is provided at both ends of a rotary kiln, and is connected to ducts for introducing raw materials, recovering processed materials and discharging generated gas, and heating for indirectly heating the rotary kiln from the outside. Means, and a seal portion that is provided between the outer periphery of the rotary kiln and the connection duct and hermetically seals the space between them, and performs stirring and conveyance while indirectly heating the raw material charged from one end side of the rotary kiln. In a rotary heat treatment facility that sucks and discharges cracked gas generated from heated raw material collected from the end side, a ring-shaped support tire mounted on the outer periphery of both sides in the axial direction of the rotary kiln, and the support tire can be rotated A support roller for supporting, the outer peripheral surface of the support tire is an inclined surface having a large diameter at both ends of the rotary kiln and a small diameter at the opposite end side, and the outer peripheral surface of the support roller is a support tire It is obtained in parallel with the inclined outer peripheral surface.
[0016]
In the rotary heat treatment equipment according to claim 2, the support roller has a truncated cone shape, and the outer peripheral surface of the support roller is an inclined surface having a small diameter at both ends of the rotary kiln and a large diameter at the opposite end side. Is.
[0017]
In the rotary heat treatment facility according to claim 3, the support roller has a cylindrical shape, and the support roller is arranged in parallel with the inclined outer peripheral surface of the support tire.
[0018]
In the rotary heat treatment equipment according to claim 4, the seal member corresponding to the outer periphery of the rotary kiln of the seal portion is a gland packing.
[0019]
In the rotary heat treatment facility according to the fifth aspect, the seal member corresponding to the outer periphery of the rotary kiln of the seal portion is an annular gasket.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic front view of a rotary heat treatment facility according to Embodiment 1 of the present invention, in which ring-shaped support tires 21 and 22 are provided on the outer periphery of both sides in the axial direction of the rotary kiln 1 so that the support tires 21 and 22 The outer peripheral surface was an inclined surface in which both ends of the rotary kiln 1 had a large diameter and the opposite end side had a small diameter. Further, the support rollers 23 and 24 for rotatably supporting the support tires 21 and 22 have a truncated cone shape, and the outer peripheral surfaces thereof are inclined so that both ends of the rotary kiln 1 have a small diameter and the opposite end side has a large diameter. This inclined surface is parallel to the inclined surfaces of the support tires 21 and 22. Further, the support roller 24 on the base point side is provided with flanges 24a at both ends in the axial direction so that the processed material collection side of the rotary kiln 1 becomes the base point of elongation even if the axial rotation of the rotary kiln 1 occurs during heating. The flange portion 24 a can be engaged with the support tire 22. Other configurations are the same as those of the prior art.
[0021]
FIG. 2 shows an enlarged cross-sectional view of the seal portion 4. A cylindrical portion 5 a is provided at the end of the connecting duct 5 on the introduction side, and a packing member protruding radially inward at the axially inner end of the cylindrical portion 5 a. A joint portion 5b is provided, and a mounting portion 5c protruding radially outward is provided at the axially outer end of the cylindrical portion 5a. On the other hand, a seal corresponding portion 1a is provided on the outer periphery of the rotary kiln 1, and a gland packing 25 is provided between the cylindrical portion 5a and the seal corresponding portion 1a. Reference numeral 26 denotes a packing retainer comprising a cylindrical portion 26a having an outer diameter substantially equal to the inner diameter of the cylindrical portion 5a and a protruding portion 26b formed to protrude radially outward at the axially outer end of the cylindrical portion 26a. Has a two-part structure in the circumferential direction, and the protruding portion 26 b and the mounting portion 5 c are connected by a bolt 27. The gland packing 25 is held between the packing engaging portion 5 b and the packing presser 26. The seal portion 6 has the same structure as the seal portion 4.
[0022]
In the above configuration, when dehydrated sludge having a water content of about 85% is introduced as a raw material from the connection duct 5, the dehydrated sludge is introduced into the rotary kiln 1 through the guide 20. The rotary kiln 1 is rotationally driven by a motor 18, and the raw material introduced into the rotary kiln 1 is conveyed to the collection side while being stirred. The inside of the rotary kiln 1 is heated by hot air gas, and the raw material is dried by indirect heating (moisture removal) to become a dried product, and this dried product is further thermally decomposed (carbonized) by indirect heating to become a carbide, and these dried The product or carbide is recovered as a processed product via the connection duct 7 or sent to the next process. When drying and carbonization are performed in a single rotary kiln 1, the temperature of the hot air gas is heated at 350 to 650 ° C. for 1 to 2 hours, and when drying and carbonization are performed in a separate rotary kiln 1, drying is performed. Heating is performed with hot air gas at 150 to 350 ° C., and carbonization is heated with hot air gas at 450 to 650 ° C.
[0023]
The raw material in the rotary kiln 1 generates gas such as water vapor gas and cracked gas by heating, and this generated gas is introduced into the cracked gas combustion furnace 9 through the connecting duct 7 and burned at 800 ° C. or higher for 2 seconds or longer. Is detoxified. The combusted exhaust gas is replaced with hot air or steam by heat exchange with air in the heat exchanger 10, and the obtained hot air is introduced into a hot air furnace and used to contribute to the reduction of fuel for generating hot air. Further, the exhaust gas is cooled to 200 to 150 ° C. in the heat exchanger 10, soot and the like are removed and purified in the bag filter 11, sucked by the exhaust blower 8, and discharged from the chimney.
[0024]
FIGS. 3A and 3B are schematic enlarged front views of the raw material introduction side portion of the rotary heat treatment equipment at normal temperature and during heating, and the inner peripheral surface of the seal portion 4 at normal temperature in FIG. And the outer peripheral surface of the rotary kiln 1 are brought into contact with each other or provided with a minute gap. Next, at the time of heating shown in FIG. 3B, the rotary kiln 1 expands in the radial direction, so that the outer diameter increases and the rotation center rises. However, on the other hand, since the support tire 21 and the support roller 23 are engaged with each other by the same taper surface, when the rotary kiln 1 is extended in the axial direction by heating, the rotary kiln 1 is moved on the support roller 23 as indicated by an arrow 28. And the rotation center moves downward. Therefore, the rotation center of the rotary kiln 1 does not rise or fall due to these combined actions, and the rotary kiln 1 and the seal portion 4 are brought close to each other by an amount corresponding to the expansion of the outer diameter of the rotary kiln 1 and are uniform over the entire circumference. The contact state is established, and the sealing effect is surely induced.
[0025]
FIG. 4 shows a schematic enlarged front view of the processed material collection side portion of the rotary heat treatment equipment at normal temperature, and the space between the inner peripheral surface of the seal portion 6 and the outer peripheral surface of the rotary kiln 1 is substantially uniform over the entire circumference. Either contact or provide a minute gap. During heating, the rotary kiln 1 expands in the radial direction and is also restricted in the axial direction by the engagement between the support tire 22 and the flange 24a of the support roller 24, but extends to some extent. For this reason, in the expansion in the radial direction, the rotation center of the rotary kiln 1 is a rising direction, and in the axial extension, the support tire 22 and the support roller 24 are engaged with each other by a tapered surface. The center of rotation is the downward direction. Accordingly, the rotational center of the rotary kiln 1 hardly rises or falls on the seal part 6 side, and the entire circumference is uniform in a direction in which the distance between the seal part 6 and the rotary kiln 1 is somewhat narrowed due to the expansion of the outer diameter of the rotary kiln 1. A good sealing effect.
[0026]
In the first embodiment, the outer peripheral surfaces of the support tires 21 and 22 are inclined surfaces in which both ends of the rotary kiln 1 have a large diameter and the opposite end side has a small diameter, and the outer peripheral surfaces of the support rollers 23 and 24. Are inclined surfaces in which both end sides of the rotary kiln 1 have a small diameter and the opposite end side has a large diameter, and the rotational center of the rotary kiln 1 rises due to the expansion in the radial direction of the rotary kiln 1 during heating. However, on the other hand, when the rotary kiln 1 extends in the axial direction, the rotational center of the rotational kiln 1 is lowered, and the rotational center of the rotational kiln 1 does not descend or rise, and the relationship with the centers of the seal portions 4 and 6 is reached. Becomes invariable, the contact relationship between the rotary kiln 1 and the seal portions 4 and 6 can be ensured at a constant level, a stable sealing function can be secured, and a stable thermal decomposition treatment can be performed. In addition, a stable sealing function can be obtained without applying an excessive biasing force to the seal portions 4 and 6. Furthermore, since the support tires 21 and 22 and the inclined surfaces of the support rollers 23 and 24 are in contact with each other, the rotary kiln 1 can move smoothly according to the expansion and contraction thereof. It is possible to maintain a stable contact relationship between the two.
[0027]
Embodiment 2
FIG. 5 is a schematic front view of the raw material introduction side portion of the rotary heat treatment facility according to the second embodiment. A support roller 29 that rotatably supports the support tire 21 is formed in a cylindrical shape, and the support roller 29 is inclined to the support tire 21. It is arranged in parallel with the outer peripheral surface. A support roller (not shown) for rotatably supporting the support tire 22 is also formed. Other configurations are the same as those of the first embodiment. Also in the second embodiment, the rotation center is in the ascending direction due to the radial expansion of the rotating kiln 1 during heating, but the rotation center of the rotating kiln 1 is in the descending direction due to the extension of the rotating kiln 1, and eventually the rotation center is unchanged. A good sealing function can be obtained during heating.
[0028]
Embodiment 3
In the first and second embodiments, the seal member corresponding to the outer periphery of the rotary kiln 1 of the seal portions 4 and 6 is the gland packing 25, but in the third embodiment, the seal member is an annular gasket. Even with such a structure, the same effects as those of the first and second embodiments are obtained.
[0029]
【The invention's effect】
As described above, according to the present invention, the outer peripheral surface of the support tire mounted on the rotary kiln is an inclined surface having a large diameter at both ends of the rotary kiln and a small diameter at the opposite end side, and the support roller The outer peripheral surface is parallel to the inclined outer peripheral surface of the support tire. For this reason, in the rotary kiln, the center of rotation is in the upward direction due to expansion in the radial direction during heating, but the center of rotation is in the downward direction by extension in the axial direction. The relationship also remains unchanged, the contact relationship between the rotary kiln and the seal portion can be ensured at a constant level, a stable sealing function can be ensured, and a stable thermal decomposition process can be performed. In addition, since the relationship between the rotation center of the rotary kiln and the center of the seal portion is unchanged, no excessive biasing force is applied to the seal portion, and a stable sealing function can be obtained. Further, since the outer peripheral surface of the support roller is parallel to the inclined outer peripheral surface of the support tire, the rotary kiln can move smoothly according to its expansion and contraction, and the stable contact relationship between the rotary kiln and the seal portion. Can be maintained.
[0030]
The support roller may have a truncated cone shape, and the outer peripheral surface thereof may be an inclined surface having a small diameter at the end side of the rotary kiln and a large diameter at the opposite end side. You may arrange | position a roller in parallel with the inclination outer peripheral surface of a support tire. The seal member corresponding to the outer periphery of the rotary kiln in the seal portion may be a gland packing or an annular gasket.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a rotary heat treatment facility according to Embodiment 1 of the present invention.
FIG. 2 is an enlarged cross-sectional view of a seal portion of a rotary heat treatment facility according to Embodiment 1 of the present invention.
FIG. 3 is a schematic enlarged front view of the raw material introduction side portion of the rotary heat treatment equipment according to Embodiment 1 at normal temperature and during heating.
FIG. 4 is a schematic enlarged front view of a processed product collection side portion of the rotary heat treatment facility according to Embodiment 1 at normal temperature.
5 is a schematic front view of a raw material introduction side portion of a rotary heat treatment facility according to Embodiment 2. FIG.
FIG. 6 is a schematic front view of a conventional rotary heat treatment facility.
FIG. 7 is a schematic enlarged front view of the conventional rotary heat treatment equipment at the raw material introduction side at normal temperature and during heating.
FIG. 8 is a schematic enlarged side view of a conventional raw material introduction side of a rotary heat treatment facility at normal temperature and during heating.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Rotary kiln 2 ... External heating means 4, 6 ... Seal part 5, 7 ... Connection duct 8 ... Exhaust blower 18 ... Motors 21, 22 ... Support tires 23, 24, 29 ... Support roller 25 ... Gland packing

Claims (5)

回転キルンの両端に設けられ、原料の導入、処理物の回収、発生ガスの排出を行う接続ダクトと、回転キルンを外部から間接加熱する加熱手段と、回転キルンの外周と接続ダクトとの間に設けられ、この間を気密にシールするシール部とを備え、回転キルンの一端側から投入した原料を間接加熱しながら攪拌と搬送を行って他端側から回収し、加熱された原料から発生する分解ガスを吸引排出する回転加熱処理設備において、回転キルンの軸方向両側の外周に装着されたリング状の支持タイヤと、支持タイヤを回転自在に支持する支持ローラとを備え、支持タイヤの外周面を、回転キルンの両端側を径大とするとともに反端部側を径小とする傾斜面とし、かつ支持ローラの外周面を支持タイヤの傾斜外周面と平行にしたことを特徴とする回転加熱処理装置。Provided at both ends of the rotary kiln, between the connection duct that introduces raw materials, collects the processed material, and discharges the generated gas, heating means for indirectly heating the rotary kiln from the outside, and between the outer periphery of the rotary kiln and the connection duct Provided with a seal portion that hermetically seals the space between them, and the raw material charged from one end of the rotary kiln is stirred and transported while indirectly heating, recovered from the other end, and decomposed from the heated raw material In a rotary heat treatment facility that sucks and discharges gas, the rotary kiln includes a ring-shaped support tire mounted on the outer periphery on both axial sides of the rotary kiln, and a support roller that rotatably supports the support tire. Rotation characterized in that both ends of the rotary kiln have an inclined surface with a large diameter and an opposite end side with a small diameter, and the outer peripheral surface of the support roller is parallel to the inclined outer peripheral surface of the support tire. Heat treatment apparatus. 支持ローラを円錐台形状とし、支持ローラの外周面を、回転キルンの両端側を径小とするとともに反端部側を径大とする傾斜面としたことを特徴とする請求項1記載の回転加熱処理装置。2. The rotation according to claim 1, wherein the support roller has a truncated cone shape, and the outer peripheral surface of the support roller is an inclined surface having a small diameter at both ends of the rotary kiln and a large diameter at the opposite end side. Heat treatment device. 支持ローラを円柱形状とし、この支持ローラを支持タイヤの傾斜外周面と平行に配置したことを特徴とする請求項1記載の回転加熱処理設備。2. The rotary heat treatment equipment according to claim 1, wherein the support roller has a cylindrical shape, and the support roller is disposed in parallel with the inclined outer peripheral surface of the support tire. シール部の回転キルンの外周と対応するシール部材は、グランドパッキンであることを特徴とする請求項1〜3の何れかに記載の回転加熱処理装置。The rotary heat treatment apparatus according to claim 1, wherein the seal member corresponding to the outer periphery of the rotary kiln of the seal portion is a gland packing. シール部の回転キルンの外周と対応するシール部材は、環状ガスケットであることを特徴とする請求項1〜3の何れかに記載の回転加熱処理装置。The rotary heat treatment apparatus according to claim 1, wherein the seal member corresponding to the outer periphery of the rotary kiln of the seal portion is an annular gasket.
JP2003209051A 2003-08-27 2003-08-27 Rotary heat treatment facility Pending JP2005069504A (en)

Priority Applications (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010236800A (en) * 2009-03-31 2010-10-21 Kurimoto Ltd Seal structure of rotary kiln
KR20230116463A (en) * 2022-01-28 2023-08-04 리젠에코솔루션(주) Apparatus and method for recycling waste synthetic resin
KR102660635B1 (en) * 2023-07-31 2024-04-25 주식회사 더블유아이 Sealing Equipment for Waste Synthetic Resin Pyrolysis System

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010236800A (en) * 2009-03-31 2010-10-21 Kurimoto Ltd Seal structure of rotary kiln
KR20230116463A (en) * 2022-01-28 2023-08-04 리젠에코솔루션(주) Apparatus and method for recycling waste synthetic resin
KR102660629B1 (en) 2022-01-28 2024-05-03 리젠에코솔루션(주) Apparatus and method for recycling waste synthetic resin
KR102660635B1 (en) * 2023-07-31 2024-04-25 주식회사 더블유아이 Sealing Equipment for Waste Synthetic Resin Pyrolysis System

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