JP2004060926A

JP2004060926A - Flow passage selector valve, and multi-bed heat storage type waste gas treatment equipment using the same

Info

Publication number: JP2004060926A
Application number: JP2002216854A
Authority: JP
Inventors: Takaaki Fujimoto; 藤本　卓昭; Hiroshi Ichiyanagi; 一柳　宏
Original assignee: Babcock Hitachi KK
Current assignee: Mitsubishi Power Ltd
Priority date: 2002-07-25
Filing date: 2002-07-25
Publication date: 2004-02-26

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the structure of a gas distributing mechanism of a multi-bed heat storage type waste gas treatment equipment. <P>SOLUTION: Flow passage selector valves 20a, 20b and 20c are provided to selectively connecting a first-a third heat storage chambers 3a, 3b and 3c provided to be communicated with a combustion chamber 2 to any one of a gas-to-be-treated supply pipe 16, a purge gas supply pipe 17 and a treated gas discharge pipe 18. The flow passage selector valves 20a, 20b and 20c are formed by air-tightly inserting a cylindrical valve element 22 into an outer cylinder 22 freely to be rotated, and a first-a third nozzles 23, 24 and 25 are arranged with an equal space in the circumferential direction of the outer cylinder facing to the valve element 22, and respectively connected to the gas-to-be-treated supply pipe 16, the purge gas supply pipe 17 and the treated gas discharge pipe 18. A fourth nozzle is provided, displacing from positions of the first -the third nozzles in the axial direction, and the valve element 22 is formed with a valve element flow passage, which is communicated with any one of the first-the third nozzles, freely to be communicated with the fourth nozzle, and a rotation phase of the valve element 22 is set by displacing a space between the first-the third nozzles from each other. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、種々のプラントや生産設備等から排出される有害物質を含む廃ガスの処理技術に係り、具体的には多塔蓄熱式の廃ガス処理装置のガス分配に好適な流路切替弁に関する。
【０００２】
【従来の技術】
種々のプラントや生産設備等から排出される有害物質を含む廃ガスを無害化して大気に放出することが行なわれている。例えば、自動車等の塗装工場、金属洗浄、印刷工場などからは、トルエン、キシレン等の揮発性有機化合物（以下、ＶＯＣと略す。）を含んだ廃ガスが発生する。このような廃ガス中のＶＯＣ濃度は、せいぜい数十ｐｐｍから数％程度であるが、環境への影響が大きいため、浄化処理を施し、無公害にして大気に放出することが提案されている。
【０００３】
一般に、廃ガスの浄化処理方法としては、直接燃焼式、触媒燃焼式、畜熱燃焼式、濃縮式、生物処理式等があるが、有害物質の濃度量変動への対応やランニングコスト、保守保全の面から蓄熱燃焼式が有力視されている。また、ランニングコストの低減及び設置面積を低減するため、大容量化が要求されている。
【０００４】
従来の蓄熱燃焼式の廃ガス処理装置は、有害物質を含む廃ガス（以下、被処理ガスと略す。）を燃焼室に導いて燃焼処理し、これにより有害物質を無害な物質にするものである。特に、燃焼排ガスの熱により蓄熱材を加熱し、その蓄熱で燃焼室に導く被処理ガスを予熱することにより、熱効率を向上するようにしている（特開２０００−８８２３０号、特開２０００−１１１０２６号）。
【０００５】
【発明が解決しようとする課題】
ところで、最近の蓄熱燃焼式の廃ガス処理装置は、処理量が５００ｍ^３／ｍｉｎを越える大容量化が望まれており、そのためには複数の蓄熱室（一般的には２〜４塔）を有する多塔蓄熱式の開発が望まれている。それら複数の蓄熱室は、それぞれ、燃焼室から排出される燃焼排ガスの熱による蓄熱と、燃焼室に導入する被処理ガスの予熱とを交互に繰り返すように運用される。
【０００６】
例えば、３塔式の蓄熱室を有する廃ガス処理装置は、３つの独立した蓄熱室を１つの燃焼室に連通して構成し、例えば、ある期間は被処理ガスを一の蓄熱室（例えば、第１の蓄熱室）を通して予熱して燃焼室に導き、燃焼室から排出される燃焼排ガスを他の蓄熱室（例えば、第３の蓄熱室）に流して蓄熱させる。次の期間は、蓄熱された蓄熱室（例えば、第３の蓄熱室）により被処理ガスを予熱し、燃焼排ガスは更に他の蓄熱室（例えば、第２の蓄熱室）に流して蓄熱させる。このように、３つの蓄熱室は、それぞれ蓄熱モード及び予熱モードに順次切り替えられて運用される。ところで、予熱モードの終了時には蓄熱室に被処理ガスが残留しているから、そのまま蓄熱モードに切替わると、被処理ガスが燃焼処理されないまま大気に放出されることになる。そこで、予熱モードと蓄熱モードとの間に、燃焼排ガスなどのパージガスを蓄熱室に供給して、蓄熱室に残留されている被処理ガスを燃焼室に追い出して燃焼処理するようにする。つまり、各蓄熱室を予熱モード、パージモード、蓄熱（熱回収）モードの順で切替運転することになる。
【０００７】
しかし、このような切替運転を行なうためには、被処理ガス供給ライン、排ガス排出ライン、パージガス供給ラインを各蓄熱室に切り替えて連通する必要がある。この切り替えをバルブを用いて行なうと、各蓄熱室に対して３個ずつのバルブが必要になり、しかもそれらのバルブを自動的に開閉して運転モードを切り替えなければならない。
【０００８】
したがって、バルブの数が多くなり、かつ各バルブの開閉を順次動作により制御しなければならないという問題がある。
【０００９】
本発明は、このような問題に鑑み、多塔蓄熱式の廃ガス処理装置のガス分配に好適な流路切替弁を実現することを課題とする。
【００１０】
【課題を解決するための手段】
上記課題を解決するために、本発明の流路切替弁は、円筒状のケーシングと、該ケーシングに気密に挿入された円柱状の弁体と、該弁体を前記ケーシングの両端に回転可能に軸支する回転軸と、前記弁体に対向するケーシングの周方向に等間隔に配置された第１乃至第３のノズルと、前記第１乃至第３のノズルの位置から前記ケーシングの軸方向に位置をずらして前記ケーシングの外周面に設けられた第４のノズルとを備え、前記弁体は、該弁体の少なくとも外周部に前記第１乃至第３のノズルのいずれか１つに連通する弁体流路が形成され、該弁体流路は、前記第４のノズルの位置に対向する前記弁体の外周部を縮径して形成された前記ケーシング内の空間に連通されてなることを特徴とする。
【００１１】
このように構成されることから、弁体を回転することにより、弁体に形成された弁体流路が第１〜第３のノズルに順次切り替わって連通される。これにより、第１〜第３のノズルは、弁体流路を介して第４のノズルに順次連通されることになる。そこで、第４のノズルを蓄熱室に連結し、第１〜第３のノズルを被処理ガス供給管、パージガス供給管、処理ガス排出管にそれぞれ連結すれば、１つの弁体を回転させることにより、蓄熱室の運転モードを予熱モード、パージモード、蓄熱モードに順次切り替えて運転することができる。
【００１２】
この場合において、弁体を中実円筒とし、弁体流路を第１乃至第３のノズルの位置から縮径部に至るまで中実円筒の弁体外周面に形成された切欠きとし、該切欠きの周方向幅が前記第１乃至第３のノズル相互間の内法寸法よりも小さく形成することが好ましい。これによれば、切欠きが同時に第１〜第３のノズルの内の２つのノズルに連通することを防止できるから、被処理ガス、パージガス、あるいは処理ガスが交じり合うの防止できる。
【００１３】
また、弁体は中空円筒状とし、円筒の一端を円板部材により閉塞し、他端を開口を有する円板部材により仕切り、中空円筒の周面に第１〜第３のノズルのいずれか１つに対向する位置に開口を形成し、この開口の周方向寸法を第１〜第３のノズル相互間の内法寸法よりも小さく形成してもよい。このようにすれば、第１〜第３のノズルは、中空の弁体内部と円板部材の開口を介して第４のノズルと連通することになり、弁体の製造が簡単になる。
【００１４】
上述した本発明の流路切替弁を、例えば３塔式蓄熱燃焼装置のガス流路切替弁として使用する場合は、次のように構成すればよい。すなわち、被処理ガスを燃焼する燃焼室と、該燃焼室にそれぞれ連通して設けられ蓄熱材が充填された第１〜第３の蓄熱室と、該第１〜第３の蓄熱室をそれぞれ被処理ガス供給管とパージガス供給管と処理ガス排出管のいずれか１つに切り替えて連通させる第１〜第３の流路切替弁とを備えて構成する。そして、その第１〜第３の流路切替弁として本発明の流路切替弁を適用し、第４のノズルをそれぞれ第１〜第３の蓄熱室に接続し、第１〜第３のノズルをそれぞれ被処理ガス供給管とパージガス供給管と処理ガス排出管とに連結する。また、第１〜第３の流路切替弁の弁体の回転位相を互いに第１〜第３のノズルの間隔ずつずらして設ける。これにより、３つの運転モードを、各蓄熱室ごとに振り分けることができ、かつ弁体を回転することにより各蓄熱室を３つのモードに順次切り替えて、連続的に廃ガスを処理することができる。
【００１５】
ところで、各蓄熱室に本発明の流路切替弁を１つずつ独立に設けると、３つの弁体の相互回転位相を一定のずれを維持して回転制御する必要がある。そこで、各流路切替弁のケーシングを一体に形成し、かつ回転軸を共通化し、かつ３つの弁体の弁体流路の回転位相を１２０度づつずらして形成するのが好ましい。これにより、回転軸の回転に伴い、各弁体が連動して回転するから、回転位相ずれを保持することができ、かつ構造を簡単化することができる。この場合、各弁体の間に仕切りを設けることにより、各流路切替弁が相互に連通することを防止できる。
【００１６】
【発明の実施の形態】
以下、本発明の実施形態を図面を参照して説明する。図１は本発明にかかる一実施形態の流路切替弁を用いた多塔蓄熱式廃ガス処理装置の全体構成図を示し、図２は図１の側断面図である。
【００１７】
図示のように、本実施形態の多塔蓄熱式廃ガス処理装置は、３つの蓄熱室を有する３塔式の蓄熱燃焼炉１を備えて構成される。蓄熱燃焼炉１は、上部に燃焼室２が配置され、その下部に３つの蓄熱室３ａ、ｂ、ｃが並列に燃焼室２に連通させて設けられている。燃焼室２と蓄熱室３ａ、ｂ、ｃの外部と接する炉壁は、耐熱壁６を外壁７で囲んで形成されている。燃焼室２の炉壁には、ＶＯＣガスを燃焼するためのバーナ８が備えられている。各蓄熱室３ａ、ｂ、ｃには蓄熱材９が充填されている。これらの蓄熱材９は、下方から多孔支持部材１０で支持されている。このように構成された蓄熱燃焼炉１は、蓄熱室側面に設置された支持部材１１で架台１２に固定されている。また、各蓄熱室３ａ、ｂ、ｃの多孔支持部材１０の下部空間１３ａ、ｂ、ｃは、流路切替弁２０を介して被処理ガス供給管１６、パージガス供給管１７及び処理ガス排出管１８に切替接続されるようになっている。被処理ガス供給管１６は、図示していない自動車等の塗装工場等から排出されるＶＯＣ等の廃ガスが供給されるようになっている。処理ガス排出管１８は、誘引送風機１９に連結され、蓄熱燃焼炉１から排出される燃焼排ガスを吸引して、図示していない煙突から大気に放出するようになっている。また、パージガス供給管１７は、誘引送風機１９から吐出される燃焼排ガスを分岐して、蓄熱燃焼炉１のパージガスとして供給するようになっている。
【００１８】
次に、本発明の特徴に係る流路切替弁２０の構成について説明する。流路切替弁２０は、３つの流路切替弁２０ａ、ｂ、ｃの集合弁として形成されている。すなわち、円筒状の外筒２１に円筒状の３つの弁体２２ａ、ｂ、ｃを挿入し、３つの弁体２２ａ、ｂ、ｃを外筒２１の両端に軸支された回転軸２８に固定して、３つの流路切替弁２０ａ、ｂ、ｃが形成されている。また、弁体２２ａ、ｂ、ｃは、外筒２１の軸方向に一定間隔離して配置され、弁体２２ａ、ｂ、ｃが位置された外筒２１の外周面に、第１〜第３のノズル２３ａ、ｂ、ｃ〜２５ａ、ｂ、ｃが周方向に等間隔（図示例では、１２０度ピッチ）に配置されている。第１のノズル２３ａ、ｂ、ｃは被処理ガス供給管１６に接続され、第２のノズル２４ａ、ｂ、ｃはパージガス供給管１７に接続され、第３のノズル２５ａ、ｂ、ｃは処理ガス排出管１８に接続されている。また、第１〜第３のノズル２３ａ、ｂ、ｃ〜２５ａ、ｂ、ｃの位置から外筒２１の軸方向に位置をずらし、弁体２２ａ、ｂ、ｃが存在しない空間の外筒２１の外周面に第４のノズル２６ａ、ｂ、ｃが設けられている。また、後述するように、弁体２２ａ、ｂ、ｃは、少なくとも外周部に第１〜第３のノズルのいずれか１つに連通する弁体流路が形成され、その弁体流路は第４のノズル２６ａ、ｂ、ｃが連通された外筒２１内の空間２７ａ、ｂ、ｃに連通可能に形成されている。
【００１９】
一方、燃焼室２には、燃焼室内の温度を検出する温度検出器５１が備えられ、この温度検出器５１により検出される燃焼室温度は制御盤６０に入力されている。制御盤６０は運転条件に合わせてモータ６１を駆動し、モータ６１に連結された動力伝達機構６２を介して流路切替弁２０の回転軸２８を回転駆動し、各蓄熱室３ａ、ｂ、ｃを被処理ガス供給管１６、パージガス供給管１７及び処理ガス排出管１８に切替接続するようになっている
ここで、図３〜図６を参照して、流路切替弁２０の具体的な実施形態を詳細に説明する。図３は流路切替弁２０の斜視図を示し、図４は部分断面図を示し、図５は図４の線Ｖ−Ｖにおける断面図を示す。図示のように、流路切替弁２０の外筒２１の両端は円板状のエンドプレート３０で閉塞されている。このエンドプレート３０の軸心位置に、回転軸２８が回転自由に軸支されている。また、回転軸２８には、３個の中空円筒状の弁体２２ａ、ｂ、ｃが等間隔で固定され、その外周面は外筒２１の内面に一定の間隙を保持して設けられている。回転軸２８の一端は、エンドプレート３０から突き出して設けられ、その端部に歯車３１が取り付けられている。歯車３１は連結ベルト３２を介してモータ６１の歯車３３に係合されている。
【００２０】
各弁体２２ａ、ｂ、ｃは、いずれも同一形状に形成されている。そこで、弁体２２ａを例にして、詳細構成を説明する。弁体２２ａは、平板を筒状に曲げ加工して、平板の両端が開いた状態の中空状の開口筒体３４を形成し、その両端面に開口用側板３５と閉止用側板３６を固着して形成される。開口用側板３５は、弁体２２ａに対応する第４のノズル２６ａ側に配置され、第１〜第４のノズルのいずれにもかからない位置に配置される。開口用側板３５には、軸心から周縁部に至る扇形状の開口３８が形成されている。開口筒体３４の外周面の軸方向に形成された開口３７は、開口用側板３５の開口３８に合わせて設けられている。開口筒体３４の開口３７の周方向の開口幅は、第１〜第３のノズル２３ａ、２４ａ、２５ａが相互に連通するのを防止するために、第１〜第３のノズル２３ａ、２４ａ、２５ａの２つに同時に連通しない幅に形成されている。また、各弁体２２ａ〜ｃの開口３７の位置は、相互に１２０°回転位相をずらして回転軸２８に固着されている。
【００２１】
ここで、弁体２２ａを例にして、弁体部のシール機構について図６を参照して説明する。図６は、図４のＣ部を拡大して示した断面図であり、同図に示すように、開口用側板３５と閉止用側板３６の周縁部の全周にわたって、それぞれ外側に円環状の１対のパッキン受け３９が設けられ、この１対のパッキン受け３９により形成される環状溝にパッキン４０が装着されている。そして、パッキン４０を円環状のパッキン押え４１により、それぞれ開口用側板３５と閉止用側板３６に押し付けることによって、空間２７ａ、ｂ、ｃ相互間の気密が保たれている。なお、パッキン押え４１は、固定部材４２によって外筒２１の内壁に固定されている。また、回転軸２８がエンドプレート３０を貫通する部分は、回転軸２８の外周を囲むパッキン４３により気密にシールされている。すなわち、エンドプレート３０の開口部に固着されたパッキン受け４４にパッキン４３を装着し、パッキン押え４５によりパッキン４３をパッキン受け４４に押し付けてシールしている。また、各弁体２２ａ，２２ｂ，２２ｃの開口筒体３４と外筒２１の内面の隙間を介して、被処理ガス供給管１６、パージガス供給管１７、処理ガス排出管１８が互いに連通しないように、開口筒体３４と外筒２１の内面の間にシール材を設けることが好ましい。
【００２２】
このように構成される実施形態の流路切替弁の動作について説明する。モータ６１を回転すると回転軸２８が回転し、弁体２２ａ、ｂ、ｃは共に回転する。これにより、各流路切替弁２０ａ、ｂ、ｃの第４のノズル２６ａ、ｂ、ｃは、第１のノズル２３ａ、ｂ、ｃ、第２のノズル２４ａ、ｂ、ｃ、第３のノズル２５ａ、ｂ、ｃに順次切替わって連通される。また、各弁体２２ａ、ｂ、ｃは、互いに１２０°の回転位相ずれをもって矢印４５の方向に回転される。これにより、例えば、弁体２２ａの開口３７が第１のノズル２３ａに対向する位置に来ると、開口３７は被処理ガス供給管１６に連通される。そして、弁体２２ｂの開口３７は、第３のノズル２５ｂに対向する位置に来て処理ガス排出管１８に連通され、弁体２２ｃの開口３７は、第２のノズル２４ｃに対向する位置に来てパージガス供給管１７に連通される。
【００２３】
したがって、被処理ガスが被処理ガス供給管１６から開口３７及び開口用側板３５の開口３８を通って空間２７ａに導かれ、第４のノズル２６ａから蓄熱室３ａの下部空間１３ａに供給される。蓄熱材９が蓄熱されている場合、被処理ガス供給管１６から常温〜１００℃程度で供給される被処理ガスは蓄熱材９により約７５０℃に予熱されて燃焼室２に導かれる。被処理ガスは、燃焼室２においてバーナ８により燃焼処理され、例えばＶＯＣ成分が分解されて無害化される。そして、燃焼排ガスは、蓄熱室３ｂを通って流路切替弁２０の第４のノズル２６ｂに導かれ、弁体２２ｂを介して第３のノズル２５ｂを通って処理ガス排出管１８に導かれる。処理ガス排出管１８に導かれた燃焼排ガスは誘引送風機１９により昇圧され、図示していない煙突等から大気に排出される。また、誘引送風機１９により昇圧された燃焼排ガスの一部は、パージガス供給管１７を介して弁体２２ｃの開口３７が位置する第２のノズル２４ｃを通って第４のノズル２６ｃに導かれる。これにより、燃焼排ガスが第３の蓄熱室３ｃに供給され、蓄熱室３ｃの蓄熱材９に残留していた被処理ガスを燃焼室２内に追い出す。このようにして、流路切替弁２０の回転軸２８が１２０°回転するごとに、各流路切替弁２０ａ、ｂ、ｃの第４のノズル２６ａ、ｂ、ｃは、被処理ガス供給管１６、パージガス供給管１７、処理ガス排出管１８に順次切替わって連通される。
【００２４】
さらに、図７〜図９を参照して流路切替弁２０の動作を詳細に説明する。まず、弁体２２ａ、ｂ、ｃの回転角度（位相）と、各弁体の開口３７が連通する第１のノズル２３ａ、ｂ、ｃ、第２のノズル２４ａ、ｂ、ｃ、第３のノズル２５ａ、ｂ、ｃとの関係を説明する模式図を図７に示す。図７の（ａ）は流路切替弁２０の横断面の模式図であり、同図（ｂ）は同図（ａ）の線Ｅ−Ｅにおける断面図、同図（ｃ）は同図（ａ）の各弁体の開口３７の位置の変化を示す動作パターン図である。
【００２５】
パターン１は、例えば、弁体２２ａが回転角度０°のときに、弁体２２ｂは回転方向に２４０°の回転位相ずれを有し、弁体２２ｃは回転方向に１２０°回転位相ずれを有している。したがって、パターン１の場合は、流路切替弁２０ａが被処理ガス供給管１６に接続され、流路切替弁２０ｂは処理ガス排出管１８に連通され、流路切替弁２０ｃはパージガス供給管１７に連通される。これにより、第４のノズル２６ａを介して被処理ガスが蓄熱室３ａに供給され、第４のノズル２６ｂを介して蓄熱室３ｂから燃焼排ガスが処理ガス排出管１８に排出され、第４のノズル２６ｃを介して燃焼排ガスがパージガスとして蓄熱室３ｃに供給される。
【００２６】
パターン２は、弁体２２ａが回転されて回転角度１２０°に来たときの状態を示しており、この場合は流路切替弁２０ａがパージガス供給管１７に接続され、流路切替弁２０ｂは被処理ガス供給管１６に連通され、流路切替弁２０ｃは処理ガス排出管１８に連通される。これにより、第４のノズル２６ａを介して燃焼排ガスがパージガスとして蓄熱室３ｃに供給され，第４のノズル２６ｂを介して被処理ガスが蓄熱室３ｂに供給され、第４のノズル２６ｃを介して蓄熱室３ｃから燃焼排ガスが処理ガス排出管１８に排出される。
【００２７】
パターン３は、弁体２２ａが回転されて回転角度２４０°に来たときの状態を示しており、この場合は流路切替弁２０ａが処理ガス排出管１８に接続され、流路切替弁２０ｂはパージガス供給管１７に連通され、流路切替弁２０ｃは被処理ガス供給管１６に連通される。このようにして、回転軸２８を回転して弁体２２ａ、ｂ、ｃを回転させることにより、流路切替弁２０はパターン１〜３を繰り返し、各蓄熱室３ａ、ｂ、ｃは、予熱モード、パージモード、蓄熱モードに切り替えられる。図８に、パターン１〜３の切替タイミングチャートを示す。パターン１〜３までを１サイクルとして、９０秒〜２７０秒の間隔でパターン動作が繰返して運転される。温度条件は、被処理ガスが常温から１００℃で供給され、処置ガスが１００℃〜２００℃で排出され、パージガスは１００℃〜２００℃で供給される。
【００２８】
このようにして、本実施形態によれば、蓄熱室３ａは予熱モード、パージモード、蓄熱モードの順に切り替えられ、これに対して他の蓄熱室３ｂ、ｃはそれぞれ１モードずつずらしたモードで切替運転され、連続的に廃ガスを処理することができる。
【００２９】
つまり、本実施形態によれば、流路切替弁２０を回転駆動することにより、各蓄熱室へのガス分配切り替えを自動的に行うことができる。しかも、各蓄熱室に対応する流路切替弁を一体化したことから、従来のように複数の切替弁を配設したり、複雑なシーケンスを設ける必要がない。その結果、ガス分配機構を簡単にすることができ、コスト削減、設置面積の確保等も可能となる。また、弁体の回転によって流路の切替えがスムーズに行われるため、ガスの流れを閉塞させることがなく、従来の弁開閉による蓄熱室等の圧力変動を抑制できる。
【００３０】
また、各蓄熱室は、被処理ガスを供給した後に、パージガスを供給しているから、蓄熱室に残留している未処理の廃ガスを燃焼室側に送り込んで燃焼処理することができる。その結果、パージモードの次の蓄熱モード時に燃焼排ガスを通流しても、未処理の廃ガスが煙突等から系外に排出することを防止できる。
【００３１】
また、上記実施形態において、開口用側板３５の扇形状の開口３８は、流路切替弁２０内のガスの通流口に過ぎないから、その形状は扇形状に限られるものではない。例えば、開口用側板３５の中央付近に円形の開口を形成してもよい。また、開口筒体３４の開口３７は、弁体２２の回転に伴なって第１〜第３のノズルと順次連通すればよいから、例えば、平板を筒状に曲げ加工して筒体の周面に円形の開口を設けてもよい。また、本実施形態の弁体は、中空円筒状に形成したが、例えば中実円柱状に形成し、その円柱の外周面部にガスの流路となる切欠き溝を空間２７ａ、ｂ、ｃに連通するように形成してもよい。
【００３２】
【発明の効果】
以上述べたように、本発明によれば、多塔蓄熱式の廃ガス処理装置のガス分配機構を簡単な構成にすることができる。
【図面の簡単な説明】
【図１】本発明に係る一実施形態の流路切替弁を用いた多塔蓄熱式の廃ガス処理装置の全体構成図である。
【図２】図１の側断面図である。
【図３】本発明に係る流路切替弁の一実施形態の斜視図である。
【図４】図３の一部を拡大して示した断面図である。
【図５】図４の線Ｖ−Ｖにおける断面図である。
【図６】図４のＣ部詳細図である。
【図７】図３の実施形態に係る流路切替弁の回転角度と流路切替の関係を説明する模式図であり、（ａ）は流路切替弁の横断面の模式図、（ｂ）は（ａ）の線Ｅ−Ｅにおける断面図、（ｃ）は流路切替弁の動作パターンを説明する模式図である。
【図８】流路切替弁の動作パターンのタイムチャートである。
【符号の説明】
１　蓄熱燃焼炉
２　燃焼室
３ａ，３ｂ，３ｃ　蓄熱室
９　蓄熱材
１６　被処理ガス供給管
１７　パージガス供給管
１８　処理ガス排出管
２０　流路切替弁
２１　外筒
２２ａ，２２ｂ，２２ｃ　弁体
２３ａ，２３ｂ，２３ｃ　第１のノズル
２４ａ，２４ｂ，２４ｃ　第２のノズル
２５ａ，２５ｂ，２５ｃ　第３のノズル
２８　回転軸[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technology for treating waste gas containing harmful substances discharged from various plants, production facilities, and the like, and specifically, a flow path switching valve suitable for gas distribution in a multi-tower thermal storage type waste gas treatment device. About.
[0002]
[Prior art]
BACKGROUND ART Waste gas containing harmful substances discharged from various plants, production facilities, and the like has been detoxified and released to the atmosphere. For example, a waste gas containing a volatile organic compound (hereinafter, abbreviated as VOC) such as toluene or xylene is generated from a coating plant such as an automobile, a metal washing plant, a printing plant, and the like. The VOC concentration in such waste gas is at most about several tens of ppm to several%, but since it has a great effect on the environment, it has been proposed to perform purification treatment and release it to the atmosphere without pollution. .
[0003]
In general, waste gas purification methods include direct combustion, catalytic combustion, livestock combustion, enrichment, and biological treatment methods. From the viewpoint of heat storage combustion, it is considered to be promising. Further, in order to reduce the running cost and the installation area, a large capacity is required.
[0004]
A conventional heat storage combustion type waste gas treatment apparatus is configured to guide a waste gas containing a harmful substance (hereinafter, abbreviated as a gas to be treated) into a combustion chamber for combustion treatment, thereby converting the harmful substance into a harmless substance. is there. In particular, the heat storage material is heated by the heat of the combustion exhaust gas, and the gas to be treated guided to the combustion chamber is preheated by the heat storage, thereby improving the thermal efficiency (JP-A-2000-88230, JP-A-2000-111026). issue).
[0005]
[Problems to be solved by the invention]
By the way, a recent heat storage combustion type waste gas treatment apparatus is required to have a large capacity exceeding 500 m ³ / min, and for that purpose, a plurality of heat storage chambers (generally, 2 to 4 towers) are required. It is desired to develop a multi-storage thermal storage system. Each of the plurality of heat storage chambers is operated so as to alternately repeat heat storage by the heat of the combustion exhaust gas discharged from the combustion chamber and preheating of the gas to be treated introduced into the combustion chamber.
[0006]
For example, a waste gas treatment apparatus having a three-column heat storage chamber is configured by connecting three independent heat storage chambers to one combustion chamber. For example, for a certain period, the gas to be treated is stored in one heat storage chamber (for example, The heat is preheated through the first heat storage chamber and guided to the combustion chamber, and the combustion exhaust gas discharged from the combustion chamber flows to another heat storage chamber (for example, a third heat storage chamber) to store heat. In the next period, the gas to be treated is preheated by the stored heat storage chamber (for example, the third heat storage chamber), and the combustion exhaust gas is further flowed to another heat storage chamber (for example, the second heat storage chamber) to store heat. As described above, the three heat storage chambers are sequentially switched to the heat storage mode and the preheat mode for operation. By the way, since the gas to be treated remains in the heat storage chamber at the end of the preheating mode, if the mode is switched to the heat storage mode as it is, the gas to be treated is released to the atmosphere without being subjected to the combustion treatment. Therefore, between the preheating mode and the heat storage mode, a purge gas such as combustion exhaust gas is supplied to the heat storage chamber, and the gas to be processed remaining in the heat storage chamber is expelled into the combustion chamber to perform combustion processing. That is, the respective heat storage chambers are switched in the order of the preheating mode, the purge mode, and the heat storage (heat recovery) mode.
[0007]
However, in order to perform such a switching operation, it is necessary to switch the processing target gas supply line, the exhaust gas discharge line, and the purge gas supply line to the respective heat storage chambers so as to communicate with each other. If this switching is performed using a valve, three valves are required for each heat storage chamber, and the operation mode must be switched by automatically opening and closing those valves.
[0008]
Therefore, there is a problem that the number of valves increases and the opening and closing of each valve must be controlled sequentially by operation.
[0009]
In view of such a problem, an object of the present invention is to realize a flow path switching valve suitable for gas distribution in a multi-tower thermal storage type waste gas treatment device.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, a flow path switching valve of the present invention includes a cylindrical casing, a cylindrical valve element hermetically inserted into the casing, and a rotatable valve element at both ends of the casing. A rotating shaft that is rotatably supported, first to third nozzles arranged at equal intervals in a circumferential direction of the casing facing the valve body, and an axial direction of the casing from a position of the first to third nozzles. A fourth nozzle provided on the outer peripheral surface of the casing at a shifted position, wherein the valve body communicates with at least one of the first to third nozzles at least on the outer peripheral portion of the valve body. A valve body flow path is formed, and the valve body flow path is communicated with a space in the casing formed by reducing a diameter of an outer peripheral portion of the valve body facing the position of the fourth nozzle. It is characterized by.
[0011]
With this configuration, by rotating the valve body, the valve body flow path formed in the valve body is sequentially switched to the first to third nozzles and communicated. Thus, the first to third nozzles are sequentially communicated with the fourth nozzle via the valve body flow path. Therefore, if the fourth nozzle is connected to the heat storage chamber and the first to third nozzles are respectively connected to the gas supply pipe to be processed, the purge gas supply pipe, and the processing gas discharge pipe, one valve body is rotated. The operation mode of the heat storage chamber can be sequentially switched to the preheating mode, the purge mode, and the heat storage mode for operation.
[0012]
In this case, the valve body is a solid cylinder, and the valve body flow path is a notch formed on the outer peripheral surface of the valve body of the solid cylinder from the positions of the first to third nozzles to the reduced diameter portion. It is preferable that the circumferential width of the notch is formed smaller than the inner dimension between the first to third nozzles. According to this, since the notch can be prevented from communicating with two of the first to third nozzles at the same time, it is possible to prevent the gas to be processed, the purge gas, or the processing gas from intermingling.
[0013]
Further, the valve body has a hollow cylindrical shape, one end of the cylinder is closed by a disk member, and the other end is partitioned by a disk member having an opening, and one of the first to third nozzles is provided on the peripheral surface of the hollow cylinder. An opening may be formed at a position facing each other, and a circumferential dimension of the opening may be formed smaller than an inner dimension between the first to third nozzles. With this configuration, the first to third nozzles communicate with the fourth nozzle through the inside of the hollow valve body and the opening of the disk member, thereby simplifying the manufacture of the valve body.
[0014]
When the above-described flow path switching valve of the present invention is used, for example, as a gas flow path switching valve of a three-tower thermal storage combustion device, the following configuration may be used. That is, the combustion chamber for burning the gas to be treated, the first to third heat storage chambers provided in communication with the combustion chambers and filled with the heat storage material, and the first to third heat storage chambers are respectively covered. The apparatus is provided with first to third flow path switching valves for switching and communicating with any one of the processing gas supply pipe, the purge gas supply pipe, and the processing gas discharge pipe. Then, the flow path switching valve of the present invention is applied as the first to third flow path switching valves, the fourth nozzles are respectively connected to the first to third heat storage chambers, and the first to third nozzles are connected. Are connected to a processing gas supply pipe, a purge gas supply pipe, and a processing gas discharge pipe, respectively. In addition, the rotation phases of the valve bodies of the first to third flow path switching valves are provided so as to be shifted from each other by an interval of the first to third nozzles. Thus, the three operation modes can be assigned to each heat storage chamber, and the heat storage chambers can be sequentially switched to the three modes by rotating the valve element, thereby continuously processing waste gas. .
[0015]
By the way, if one of the flow path switching valves of the present invention is independently provided in each of the heat storage chambers, it is necessary to control the rotation of the three valve bodies while maintaining a constant shift between them. Therefore, it is preferable that the casings of the respective flow path switching valves are formed integrally, the rotation axes are shared, and the rotation phases of the valve body flow paths of the three valve bodies are shifted by 120 degrees. Accordingly, each valve element rotates in conjunction with the rotation of the rotating shaft, so that a rotational phase shift can be maintained and the structure can be simplified. In this case, by providing a partition between the valve bodies, it is possible to prevent the respective flow path switching valves from communicating with each other.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram of a multi-tower regenerative waste gas treatment apparatus using a flow path switching valve according to one embodiment of the present invention, and FIG. 2 is a side sectional view of FIG.
[0017]
As shown in the figure, the multi-tower regenerative waste gas treatment apparatus of the present embodiment includes a three-tower regenerative combustion furnace 1 having three heat storage chambers. The heat storage combustion furnace 1 has a combustion chamber 2 disposed at an upper portion, and three heat storage chambers 3a, 3b, and 3c provided at a lower portion thereof so as to communicate with the combustion chamber 2 in parallel. The furnace wall that is in contact with the outside of the combustion chamber 2 and the heat storage chambers 3a, 3b, and 3c is formed by surrounding a heat-resistant wall 6 with an outer wall 7. A burner 8 for burning VOC gas is provided on a furnace wall of the combustion chamber 2. Each heat storage chamber 3a, b, c is filled with a heat storage material 9. These heat storage materials 9 are supported by a porous support member 10 from below. The heat storage combustion furnace 1 configured as described above is fixed to the gantry 12 by the support member 11 installed on the side of the heat storage chamber. Further, the lower spaces 13a, 13b, 13c of the porous support members 10 of the heat storage chambers 3a, b, c are connected to the gas supply pipe 16, the purge gas supply pipe 17, and the processing gas discharge pipe 18 via the flow path switching valve 20. Is switched and connected. The to-be-processed gas supply pipe 16 is supplied with waste gas such as VOC discharged from a coating factory such as an automobile (not shown). The processing gas discharge pipe 18 is connected to an induction blower 19, sucks combustion exhaust gas discharged from the regenerative combustion furnace 1, and discharges the exhaust gas from a chimney (not shown) to the atmosphere. Further, the purge gas supply pipe 17 branches off the combustion exhaust gas discharged from the induction blower 19 and supplies it as a purge gas for the regenerative combustion furnace 1.
[0018]
Next, the configuration of the flow path switching valve 20 according to the features of the present invention will be described. The flow path switching valve 20 is formed as a collective valve of three flow path switching valves 20a, b, and c. That is, three cylindrical valve bodies 22a, 22b and 22c are inserted into the cylindrical outer cylinder 21 and the three valve bodies 22a, 22b and 22c are fixed to the rotating shaft 28 supported at both ends of the outer cylinder 21. Thus, three flow path switching valves 20a, b, and c are formed. Further, the valve bodies 22a, 22b and 22c are spaced apart from each other by a predetermined distance in the axial direction of the outer cylinder 21. The first to third valves are disposed on the outer peripheral surface of the outer cylinder 21 where the valve bodies 22a, 22b and 22c are located. The nozzles 23a, b, c to 25a, b, c are arranged at equal intervals in the circumferential direction (in the illustrated example, at a pitch of 120 degrees). The first nozzles 23a, b, c are connected to the processing gas supply pipe 16, the second nozzles 24a, b, c are connected to the purge gas supply pipe 17, and the third nozzles 25a, b, c are processing gas. It is connected to the discharge pipe 18. Further, the positions of the first to third nozzles 23a, b, c to 25a, b, and c are shifted in the axial direction of the outer cylinder 21 from the positions of the first to third nozzles 23a, b, c to 25a, b, and c. Fourth nozzles 26a, 26b and 26c are provided on the outer peripheral surface. Further, as described later, the valve bodies 22a, 22b, and 22c have a valve body flow path formed at least on the outer peripheral portion thereof and communicating with any one of the first to third nozzles. The four nozzles 26a, b, and c are formed so as to be able to communicate with the spaces 27a, b, and c in the outer cylinder 21 that communicate with each other.
[0019]
On the other hand, the combustion chamber 2 is provided with a temperature detector 51 for detecting the temperature in the combustion chamber, and the temperature of the combustion chamber detected by the temperature detector 51 is input to the control panel 60. The control panel 60 drives the motor 61 in accordance with the operating conditions, and drives and rotates the rotary shaft 28 of the flow path switching valve 20 via a power transmission mechanism 62 connected to the motor 61, so that each of the heat storage chambers 3a, 3b, 3c Are connected to the processing gas supply pipe 16, the purge gas supply pipe 17 and the processing gas discharge pipe 18. Here, specific implementation of the flow path switching valve 20 will be described with reference to FIGS. The form will be described in detail. 3 shows a perspective view of the flow path switching valve 20, FIG. 4 shows a partial cross-sectional view, and FIG. 5 shows a cross-sectional view taken along line VV of FIG. As shown, both ends of the outer cylinder 21 of the flow path switching valve 20 are closed by disc-shaped end plates 30. A rotating shaft 28 is rotatably supported at the axial position of the end plate 30. Further, three hollow cylindrical valve bodies 22a, 22b and 22c are fixed at equal intervals to the rotating shaft 28, and the outer peripheral surface thereof is provided on the inner surface of the outer cylinder 21 with a constant gap. . One end of the rotating shaft 28 is provided so as to protrude from the end plate 30, and a gear 31 is attached to the end. The gear 31 is engaged with the gear 33 of the motor 61 via the connection belt 32.
[0020]
Each of the valve bodies 22a, 22b, 22c is formed in the same shape. Therefore, a detailed configuration will be described using the valve body 22a as an example. The valve body 22a is formed by bending a flat plate into a cylindrical shape to form a hollow opening cylindrical body 34 in which both ends of the flat plate are open, and fixing an opening side plate 35 and a closing side plate 36 to both end surfaces thereof. Formed. The opening side plate 35 is arranged on the side of the fourth nozzle 26a corresponding to the valve body 22a, and is arranged at a position that does not cover any of the first to fourth nozzles. The opening side plate 35 is formed with a fan-shaped opening 38 extending from the axis to the periphery. The opening 37 formed in the axial direction on the outer peripheral surface of the opening cylindrical body 34 is provided in accordance with the opening 38 of the opening side plate 35. The opening width of the opening 37 in the circumferential direction of the opening cylindrical body 34 is set so as to prevent the first to third nozzles 23a, 24a, 25a from communicating with each other. 25a are formed so as not to communicate with two of them at the same time. Further, the positions of the openings 37 of the valve bodies 22a to 22c are fixed to the rotation shaft 28 with a rotation phase shifted from each other by 120 °.
[0021]
Here, the sealing mechanism of the valve body portion will be described with reference to FIG. 6, taking the valve body 22a as an example. FIG. 6 is an enlarged cross-sectional view of the portion C in FIG. 4, and as shown in FIG. A pair of packing receivers 39 is provided, and a packing 40 is mounted in an annular groove formed by the pair of packing receivers 39. Then, the packing 40 is pressed against the opening side plate 35 and the closing side plate 36 by the annular packing retainer 41, thereby maintaining the airtightness between the spaces 27a, b, and c. The packing retainer 41 is fixed to the inner wall of the outer cylinder 21 by a fixing member 42. The portion where the rotating shaft 28 passes through the end plate 30 is hermetically sealed by a packing 43 surrounding the outer periphery of the rotating shaft 28. That is, the packing 43 is attached to the packing receiver 44 fixed to the opening of the end plate 30, and the packing 43 is pressed against the packing receiver 44 by the packing retainer 45 to seal. Further, the gas supply pipe 16, the purge gas supply pipe 17, and the processing gas discharge pipe 18 do not communicate with each other via a gap between the opening cylinder 34 of each of the valve bodies 22a, 22b, 22c and the inner surface of the outer cylinder 21. Preferably, a sealing material is provided between the opening cylinder 34 and the inner surface of the outer cylinder 21.
[0022]
The operation of the flow path switching valve according to the embodiment configured as described above will be described. When the motor 61 rotates, the rotation shaft 28 rotates, and the valve bodies 22a, 22b, and 22c rotate together. Thereby, the fourth nozzles 26a, b, c of the respective flow path switching valves 20a, b, c are connected to the first nozzles 23a, b, c, the second nozzles 24a, b, c, and the third nozzle 25a. , B, and c are sequentially switched for communication. Further, the respective valve elements 22a, 22b and 22c are rotated in the direction of arrow 45 with a rotational phase shift of 120 ° from each other. Thus, for example, when the opening 37 of the valve body 22a comes to a position facing the first nozzle 23a, the opening 37 is communicated with the gas supply pipe 16 to be processed. The opening 37 of the valve body 22b comes to a position facing the third nozzle 25b and communicates with the processing gas discharge pipe 18, and the opening 37 of the valve body 22c comes to a position facing the second nozzle 24c. And is connected to the purge gas supply pipe 17.
[0023]
Therefore, the gas to be treated is guided from the gas supply pipe 16 to the space 27a through the opening 37 and the opening 38 of the opening side plate 35, and is supplied from the fourth nozzle 26a to the lower space 13a of the heat storage chamber 3a. When the heat storage material 9 is stored, the gas to be processed supplied from the gas supply pipe 16 at room temperature to about 100 ° C. is preheated to about 750 ° C. by the heat storage material 9 and guided to the combustion chamber 2. The gas to be treated is burned in the combustion chamber 2 by the burner 8, and the VOC component is decomposed and made harmless. Then, the combustion exhaust gas is guided to the fourth nozzle 26b of the flow path switching valve 20 through the heat storage chamber 3b, and is guided to the processing gas discharge pipe 18 through the third nozzle 25b via the valve body 22b. The combustion exhaust gas guided to the processing gas discharge pipe 18 is boosted in pressure by an induction blower 19 and discharged to the atmosphere from a chimney (not shown) or the like. A part of the combustion exhaust gas pressurized by the induction blower 19 is guided to the fourth nozzle 26c through the purge gas supply pipe 17, through the second nozzle 24c where the opening 37 of the valve body 22c is located. Thereby, the combustion exhaust gas is supplied to the third heat storage chamber 3c, and the gas to be processed remaining in the heat storage material 9 of the heat storage chamber 3c is expelled into the combustion chamber 2. In this manner, each time the rotary shaft 28 of the flow path switching valve 20 rotates 120 °, the fourth nozzles 26a, b, c of the flow path switching valves 20a, b, c The purge gas supply pipe 17 and the processing gas discharge pipe 18 are sequentially switched to communicate with each other.
[0024]
Further, the operation of the flow path switching valve 20 will be described in detail with reference to FIGS. First, the first nozzles 23a, b, c, the second nozzles 24a, b, c, and the third nozzle through which the rotation angles (phases) of the valve bodies 22a, b, and c communicate with the openings 37 of the respective valve bodies. FIG. 7 is a schematic diagram for explaining the relationship with 25a, b, and c. 7A is a schematic diagram of a cross section of the flow path switching valve 20, FIG. 7B is a cross-sectional view taken along line EE of FIG. 7A, and FIG. It is an operation | movement pattern diagram which shows the change of the position of the opening 37 of each valve body of a).
[0025]
In pattern 1, for example, when the valve element 22a has a rotation angle of 0 °, the valve element 22b has a rotational phase shift of 240 ° in the rotational direction, and the valve element 22c has a rotational phase shift of 120 ° in the rotational direction. ing. Therefore, in the case of pattern 1, the flow path switching valve 20a is connected to the gas supply pipe 16 to be processed, the flow path switching valve 20b is connected to the processing gas discharge pipe 18, and the flow path switching valve 20c is connected to the purge gas supply pipe 17. Communicated. As a result, the gas to be treated is supplied to the heat storage chamber 3a via the fourth nozzle 26a, and the combustion exhaust gas is discharged from the heat storage chamber 3b to the processing gas discharge pipe 18 via the fourth nozzle 26b. The combustion exhaust gas is supplied to the heat storage chamber 3c as a purge gas via 26c.
[0026]
Pattern 2 shows a state where the valve body 22a is rotated and reaches a rotation angle of 120 °. In this case, the flow path switching valve 20a is connected to the purge gas supply pipe 17, and the flow path switching valve 20b is closed. The processing gas supply pipe 16 is connected to the processing gas supply pipe 16, and the flow path switching valve 20 c is connected to the processing gas discharge pipe 18. As a result, the combustion exhaust gas is supplied as a purge gas to the heat storage chamber 3c via the fourth nozzle 26a, and the gas to be treated is supplied to the heat storage chamber 3b via the fourth nozzle 26b, and is supplied via the fourth nozzle 26c. The combustion exhaust gas is discharged from the heat storage chamber 3c to the processing gas discharge pipe 18.
[0027]
Pattern 3 shows a state when the valve body 22a is rotated to reach a rotation angle of 240 °. In this case, the flow path switching valve 20a is connected to the processing gas discharge pipe 18, and the flow path switching valve 20b is The flow path switching valve 20 c is communicated with the purge gas supply pipe 17, and the processing gas supply pipe 16. In this way, by rotating the rotating shaft 28 and rotating the valve bodies 22a, b, c, the flow path switching valve 20 repeats the patterns 1 to 3, and the heat storage chambers 3a, b, c are set in the preheating mode. , The mode is switched to the purge mode and the heat storage mode. FIG. 8 shows a switching timing chart of patterns 1 to 3. The pattern operation is repeatedly performed at intervals of 90 seconds to 270 seconds, with patterns 1 to 3 as one cycle. The temperature condition is such that the gas to be treated is supplied at room temperature to 100 ° C., the treatment gas is discharged at 100 ° C. to 200 ° C., and the purge gas is supplied at 100 ° C. to 200 ° C.
[0028]
Thus, according to the present embodiment, the heat storage chamber 3a is switched in the order of the preheating mode, the purge mode, and the heat storage mode, whereas the other heat storage chambers 3b and c are switched in the mode shifted by one mode each. It can be operated and continuously process waste gas.
[0029]
That is, according to the present embodiment, the gas distribution switching to each heat storage chamber can be automatically performed by driving the flow path switching valve 20 to rotate. Moreover, since the flow path switching valves corresponding to each heat storage chamber are integrated, there is no need to arrange a plurality of switching valves or provide a complicated sequence as in the conventional case. As a result, the gas distribution mechanism can be simplified, and the cost can be reduced and the installation area can be secured. Further, since the switching of the flow path is performed smoothly by the rotation of the valve body, the flow of gas is not blocked, and the pressure fluctuation of the heat storage chamber or the like due to the conventional valve opening / closing can be suppressed.
[0030]
Further, since each heat storage chamber supplies the purge gas after supplying the gas to be treated, the untreated waste gas remaining in the heat storage chamber can be sent to the combustion chamber side to perform the combustion treatment. As a result, even if the combustion exhaust gas flows in the heat storage mode next to the purge mode, it is possible to prevent untreated waste gas from being discharged out of the system from the chimney or the like.
[0031]
In the above-described embodiment, the fan-shaped opening 38 of the opening side plate 35 is merely a gas flow port in the flow path switching valve 20, and thus the shape is not limited to the fan shape. For example, a circular opening may be formed near the center of the opening side plate 35. Further, since the opening 37 of the opening cylindrical body 34 may be sequentially communicated with the first to third nozzles with the rotation of the valve body 22, for example, a flat plate is bent into a cylindrical shape, and the periphery of the cylindrical body is formed. A circular opening may be provided on the surface. Further, the valve body of the present embodiment is formed in a hollow cylindrical shape, but is formed in, for example, a solid cylindrical shape, and a cutout groove serving as a gas flow path is formed in the outer peripheral surface of the cylinder in the spaces 27a, b, and c. You may form so that it may communicate.
[0032]
【The invention's effect】
As described above, according to the present invention, the gas distribution mechanism of the multi-tower thermal storage type waste gas treatment device can be simplified.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a multi-tower thermal storage type waste gas treatment apparatus using a flow path switching valve according to an embodiment of the present invention.
FIG. 2 is a side sectional view of FIG.
FIG. 3 is a perspective view of one embodiment of a flow path switching valve according to the present invention.
FIG. 4 is an enlarged sectional view showing a part of FIG. 3;
FIG. 5 is a sectional view taken along line VV in FIG. 4;
FIG. 6 is a detailed view of a portion C in FIG. 4;
7A and 7B are schematic diagrams illustrating the relationship between the rotation angle of the flow path switching valve and the flow path switching according to the embodiment of FIG. 3, wherein FIG. 7A is a schematic diagram of a cross section of the flow path switching valve, and FIG. 3A is a cross-sectional view taken along line EE of FIG. 3A, and FIG. 3C is a schematic diagram illustrating an operation pattern of a flow path switching valve.
FIG. 8 is a time chart of an operation pattern of the flow path switching valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heat storage combustion furnace 2 Combustion chamber 3a, 3b, 3c Heat storage chamber 9 Heat storage material 16 Gas supply pipe to be processed 17 Purge gas supply pipe 18 Process gas discharge pipe 20 Flow path switching valve 21 Outer cylinders 22a, 22b, 22c Valve bodies 23a, 23b , 23c First nozzles 24a, 24b, 24c Second nozzles 25a, 25b, 25c Third nozzle 28

Claims

A cylindrical casing, a cylindrical valve body hermetically inserted into the casing, a rotating shaft rotatably supporting the valve body at both ends of the casing, and a circumferential direction of the casing facing the valve body. First to third nozzles arranged at equal intervals, and a fourth nozzle provided on the outer peripheral surface of the casing at a position shifted in the axial direction of the casing from the position of the first to third nozzles Wherein the valve element has a valve element flow path formed at least on the outer peripheral portion of the valve element and communicating with any one of the first to third nozzles, and the valve element flow path is A flow path switching valve connected to a space in the casing formed by reducing an outer peripheral portion of the valve body facing a position of the nozzle.

The valve body is a solid cylinder,
The valve body flow path is a notch formed on the outer peripheral surface of the valve body of the solid cylinder from the position of the first to third nozzles to the reduced diameter portion, and a circumferential width of the notch 2. The flow path switching valve according to claim 1, wherein the first and third nozzles are formed to be smaller than an inner dimension between the first to third nozzles.

The valve body is formed by closing one end on the opposite side of the reduced diameter portion of the hollow cylinder and partitioning the other end by a disc member having an opening,
The valve body flow path is formed from an opening formed at a position facing one of the first to third nozzles on the outer peripheral surface of the hollow cylinder. The flow path leading to the opening, wherein a circumferential dimension of the opening formed on the outer peripheral surface of the hollow cylinder is formed to be smaller than an inner dimension between the first to third nozzles. Item 2. The flow path switching valve according to Item 1.

A combustion chamber for burning the gas to be treated, first to third heat storage chambers provided in communication with the combustion chamber and filled with a heat storage material, and the first to third heat storage chambers are respectively processed. A first to a third flow path switching valve for switching to and communicating with any one of a gas supply pipe, a purge gas supply pipe, and a processing gas discharge pipe, wherein the first to third flow path switching valves are respectively A cylindrical casing, a cylindrical valve body hermetically inserted into the casing, a rotary shaft rotatably supporting the valve body at both ends of the casing, and an outer peripheral surface of the casing at the valve body position. First to third nozzles arranged at equal intervals in the circumferential direction and connected to the processing target gas supply pipe, the purge gas supply pipe, and the processing gas discharge pipe, respectively, from the positions of the first to third nozzles; The casing is displaced in the axial direction of the casing to A fourth nozzle provided on an outer peripheral surface of the shing, wherein the valve element has a valve element flow path communicating with any one of the first to third nozzles at least on an outer peripheral portion of the valve element. The valve body flow path is formed so as to communicate with a space in the casing formed by reducing the diameter of an outer peripheral portion of the valve body facing the position of the fourth nozzle. A multi-storage regenerative waste gas treatment apparatus, wherein the rotation phases of the valve bodies of the flow path switching valve are shifted from each other by an interval of the first to third nozzles.

The valve body is a solid cylinder,
The valve body flow path is a notch formed on the outer peripheral surface of the valve body of the solid cylinder from the position of the first to third nozzles to the reduced diameter portion, and a circumferential width of the notch 5. The multi-storage regenerative waste gas treatment apparatus according to claim 4, wherein each of the first to third nozzles is formed smaller than an inner dimension between the first to third nozzles.

The valve body is formed by closing one end on the opposite side of the reduced diameter portion of the hollow cylinder and partitioning the other end by a disc member having an opening,
The valve body flow path is formed from an opening formed at a position facing one of the first to third nozzles on the outer peripheral surface of the hollow cylinder. The flow path leading to the opening, wherein a circumferential dimension of the opening formed on the outer peripheral surface of the hollow cylinder is formed to be smaller than an inner dimension between the first to third nozzles. Item 5. A multi-tower regenerative waste gas treatment apparatus according to item 4.

In the first to third flow path switching valves, the casing and the rotating shaft are formed integrally with each other, and the valve bodies of the first to third flow path switching valves have the first to third rotation phases mutually. The multi-storage regenerative waste gas treatment apparatus according to any one of claims 4 to 6, wherein the three nozzles are fixed to the rotating shaft while being shifted by intervals.