JP4284459B2 - Bag filter for exhaust gas purification treatment - Google Patents

Bag filter for exhaust gas purification treatment Download PDF

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JP4284459B2
JP4284459B2 JP2002166968A JP2002166968A JP4284459B2 JP 4284459 B2 JP4284459 B2 JP 4284459B2 JP 2002166968 A JP2002166968 A JP 2002166968A JP 2002166968 A JP2002166968 A JP 2002166968A JP 4284459 B2 JP4284459 B2 JP 4284459B2
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exhaust gas
flow
hopper
horizontally
divided
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JP2004008947A (en
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徹 清水
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Hitachi Zosen Corp
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Hitachi Zosen Corp
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  • Treating Waste Gases (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
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Description

【0001】
【発明の属する技術分野】
本発明は、例えば都市ごみの焼却炉等から発生する排ガス中に含まれるダスト、硫黄酸化物(SOx)、塩化水素(HCl)、ダイオキシン等の有害物質を除去するために用いられる排ガス浄化処理用バグフィルタに関するものである。
【0002】
【従来の技術】
従来、この種の排ガス浄化処理用バグフィルタでは、浄化処理用濾布を収容したケーシングの下部のホッパ部の流入口から被処理排ガスが流入して、ケーシング内で上昇流となり、ケーシング頂部から吊り下げられた多数の浄化処理用濾布同士の間の間隙、あるいは濾布自体の布目の隙間内を通過する。この通過の間に、排ガス中に予め吹き込まれた消石灰や特殊助剤が、濾布表面に付着して有害物質吸着層が形成され、通過する排ガス中の有害物質がこの吸着層の表面に吸着により捕集されて、排ガスが浄化され、浄化後の排ガスは、ケーシングの頂部に設けられた出口より外部に放出される。
【0003】
そして、濾布表面の吸着層が厚くなると、浄化処理用濾布を収容した排ガス浄化処理用バグフィルタケーシングの排ガス通過抵抗(通風抵抗)が増大して、ケーシング内での圧力損失が大きくなり、ブロアの負荷が増大するため、定期的に圧縮空気を、排ガス浄化処理用バグフィルタケーシングに備えられたヘッダパイプからブローチューブに送り込んで、濾布を内側から逆洗して、濾布表面から有害物質吸着層を剥離させており、剥離された消石灰等を主成分とする有害物質吸着層は、ケーシング下部のホッパ部内に落下して、そこで溜められ、所定期間の経過後に廃棄物としてスクリューコンベヤ等で外部に搬出されて、処理されている。
【0004】
【発明が解決しようとする課題】
このような従来の排ガス浄化処理用バグフィルタでは、ケーシング下部のホッパ部内にその流入口より水平方向(前後方向)に流入した排ガスは、流入口部分での流速の勢いを失わずにホッパ部の奥部の傾斜後壁に当たって、そこから上昇流となされて、ケーシング上部の浄化処理用濾布収容ゾーンに至るが、このとき、排ガス中に含まれる微粒子が濾布に強く衝突するために、濾布が破損したり、あるいはまた濾布が排ガス流によって大きく揺動してケーシングの内壁に当たったり、濾布同士が互いに擦れ合ったりして、摩耗・破損するという問題があった。
【0005】
このような問題を解決するためには、排ガス浄化処理用バグフィルタのケーシング下部のホッパ部内に前後水平方向に流入した排ガスを、ホッパ部内で一様な上昇流に変換するように整流することが必要である。
【0006】
しかしながら、ホッパ部内で排ガスの流れを一様化する構造は、濾布の逆洗時に落下した消石灰等よりなる有害物質吸着層の剥離物によってホッパ部内が閉塞しないように工夫する必要があるとともに、装置のメンテナンス時に作業者がケーシングやホッパ部内に入って作業を行なうことができるような構造とする必要がある。さらに、排ガスがホッパ部の流入口に至るまでのダクト内で充分に整流されていない場合には、ホッパ部の流入口から流入する排ガスの流れが偏った流れとなるため、これに対応する構造であることが必要となる。
【0007】
そこで、従来は、排ガス浄化処理用バグフィルタケーシング下部のホッパ部の流入口付近に排ガスの直接流入を防ぐための邪魔板を設けることが行なわれたが、排ガスの流れをケーシング全体に一様化して上昇流とすることは、困難であるという問題があった。
【0008】
本発明の目的は、上記の従来技術の問題を解決し、浄化処理用濾布を収容したケーシングの下部のホッパ部内に、排ガスの流れに応じた形状および大きさの分流板を設けることにより、ケーシング内の排ガスの流れを緩和して、均一な上昇流を生じるようにすることができ、これによって濾布の摩耗および破損を可及的に防止することができて、濾布の寿命を大幅に増大することができ、かつ濾布の取替え作業の軽減、および濾布使用数の削減が可能となり、運転コストを大幅に低減することができて、経済性が非常に高い、排ガス浄化処理用バグフィルタを提供しようとすることにある。
【0009】
【課題を解決するための手段】
上記の目的を達成するために、本発明の請求項1の発明による排ガス浄化処理用バグフィルタは、排ガス浄化処理用バグフィルタケーシング下部のホッパ部が、少なくとも3つの角錐状ホッパゾーンに区分され、各角錐状ホッパゾーンの前壁に、排ガス流入口が設けられ、中央側の角錐状ホッパゾーンの内部に、奥行き方向に所定間隔おきに左右一対ずつ複数組の垂直方向にのびる縦長分流板が排ガス流入口に対向するように配置され、左右両外側の角錐状ホッパゾーンの内部に、奥行き方向に所定間隔おきに左右水平方向にのびる横長分流板が排ガス流入口に対向するように配置され、排ガス流入口に最も近い左右水平方向にのびる横長分流板の上下幅が狭くかつ該横長分流板より下側の排ガス通過用間隙の上下幅が広いものとなされ、これより奥の左右水平方向にのびる横長分流板の上下幅が奥に至るものほど順次広いものとなされかつ該横長分流板より下側の排ガス通過用間隙の上下幅が奥に至るものほど順次狭いものとなされていることを特徴としている。
【0010】
本発明の上記請求項1に記載の排ガス浄化処理用バグフィルタによれば、ケーシング下部のホッパ部中央側の角錐状ホッパゾーンにおいては、これらの排ガス流入口から水平かつ前後方向に流入する排ガスが、流入口より一番目の組の左右一対の縦長分流板に当たって上昇流へと流れの方向を転換せしめられる所定量の排ガス部分と、同組の左右一対の縦長分流板同士の間の排ガス通過用間隙を通過する残部の排ガス部分とに分流せしめられ、さらに、排ガス通過用間隙を通過した排ガス部分が、次の二番目の組の垂直方向にのびる左右一対の縦長分流板に当たって上昇流へと流れの方向を転換せしめられる所定量の排ガス部分と、同組の左右一対の縦長分流板同士の間の排ガス通過用間隙を通過する残部の排ガス部分とに分流せしめられ、ついで、排ガス通過用間隙を通過した排ガス部分が、最終的に、角錐状ホッパゾーンのテーパ状の後壁に当たって上昇流へと流れの方向を転換せしめられて、流入排ガスが、ホッパ部全体として均等に上昇流に転換せしめられるようになされている。
これに対し、ケーシング下部のホッパ部左右両外側の角錐状ホッパゾーンにおいては、これらの排ガス流入口から水平方向に流入する排ガスが、排ガス流入口より一番目の左右水平方向にのびる横長分流板に当たって上昇流へと流れの方向を転換せしめられる所定量の排ガス部分と、横長分流板より下側の排ガス通過用間隙を通過する残部の排ガス部分とに分流せしめられ、排ガス通過用間隙を通過した排ガス部分が、次の左右水平方向にのびる横長分流板に当たって上昇流へと流れの方向を転換せしめられる所定量の排ガス部分と、同横長分流板より下側の排ガス通過用間隙を通過する残部の排ガス部分とに分流せしめられ、排ガス通過用間隙を通過した排ガス部分が、以下順次同様に流れて、最終の横長分流板より下側の排ガス通過用間隙を通過した排ガス部分が、角錐状ホッパゾーンの後壁に当たって上昇流へと流れの方向を転換せしめられて、流入排ガスが、ホッパ部全体として均等に上昇流に転換せしめられるようになされている、という作用を生じるものである。
【0011】
本発明の請求項2の発明による排ガス浄化処理用バグフィルタは、排ガス浄化処理用バグフィルタケーシング下部のホッパ部が4つの角錐状ホッパゾーンに区分され、各角錐状ホッパゾーンの前壁に、排ガス流入口が設けられ、中央側2つの角錐状ホッパゾーンの内部に、それぞれ奥行き方向に所定間隔おきに左右一対ずつ複数組の垂直方向にのびる縦長分流板が排ガス流入口に対向するように配置され、左右両外側の角錐状ホッパゾーンの内部に、それぞれ奥行き方向に所定間隔おきに左右水平方向にのびる横長分流板が排ガス流入口に対向するように配置され、排ガス流入口に最も近い左右水平方向にのびる横長分流板の上下幅が狭くかつ該横長分流板より下側の排ガス通過用間隙の上下幅が広いものとなされ、これより奥の左右水平方向にのびる横長分流板の上下幅が奥に至るものほど順次広いものとなされかつ該横長分流板より下側の排ガス通過用間隙の上下幅が奥に至るものほど順次狭いものとなされていることを特徴としている。
上記各横長分流板の排ガス通過用間隙側の下側縁部が水平状となされ、各横長分流板の左右両側縁部が、角錐状ホッパゾーンの左右壁の内面に沿う傾斜状となされているのが、好ましい。
【0012】
上記角錐状ホッパゾーンの内部に、奥行き方向に所定間隔おきに排ガス流入口に対向するように配置される左右水平方向にのびる横長分流板の枚数が、2〜5枚であるのが、好ましい。
【0013】
【発明の実施の形態】
つぎに、本発明の実施の形態を、図面を参照して説明する。
【0014】
この明細書において、前後、左右は図2を基準とし、前とは図2の下側、後とは同上側をいゝ、また左とは同図の左側、右とは同右側をいゝ、上とは同図図面紙葉の表側、下とは同裏側をいうものとする。
【0015】
図1〜図4は、本発明の実施形態を示すものである。同図を参照すると、本発明による排ガス浄化処理用バグフィルタ(1)は、多数の並列吊下げ状の浄化処理用濾布(4)を収容したケーシング(2)下部のホッパ部(3)が、4つの角錐状ホッパゾーン(3A)(3B)(3C)(3D)に区分されている。
【0016】
ここで、各角錐状ホッパゾーン(3A)(3B)(3C)(3D)は、テーパ状の前後壁(11)(12)と底壁(13)とテーパ状の左右壁(14)(15)とによって形成され、各角錐状ホッパゾーン(3A)(3B)(3C)(3D)の前壁(11)に、方形の排ガス流入口(10)が設けられている。なお、4つの角錐状ホッパゾーン(3A)(3B)(3C)(3D)のうち、相互に隣り合う角錐状ホッパゾーンのテーパ状右壁(15)の頂部とテーパ状左壁(14)同士の中間には、前後方向に水平な頂壁(16)が設けられている。
【0017】
各角錐状ホッパゾーン(3A)(3B)(3C)(3D)に排ガスを導入する排ガス導入ダクト(6)には、下方に向かって広がる中間ダクト(7)を介してヘッダ部(8)が接続され、このヘッダ部(8)に4つの短い分岐ダクト(9)が接続され、各分岐ダクト(9)の先端が、上記角錐状ホッパゾーン(3A)(3B)(3C)(3D)の前壁(11)の排ガス流入口(10)に連通せしめられている。
【0018】
一方、浄化処理用濾布(4)を収容したケーシング(2)の頂部には、浄化後の排ガスを外部に導くための処理済み排ガス排出ダクト(5)が設けられている(図4参照)。
【0019】
そして、上記排ガス浄化処理用バグフィルタ(1)の4つの角錐状ホッパゾーン(3A)(3B)(3C)(3D)のうち、ホッパ部(3)中央側の2つの角錐状ホッパゾーン(3B)(3C)の内部には、それぞれのホッパゾーン(3B)(3C)の奥行き方向の長さ(L)を3等分する位置に、左右一対ずつ2組の垂直方向にのびる縦長分流板(21)(22)および縦長分流板(24)(25)が排ガス流入口(10)に対向するように配置されている。
【0020】
これらのうち、排ガス流入口(10)に最も近い一番目の組の左右一対の縦長分流板(21)(22)同士の間の排ガス通過用間隙(23)の左右幅が広くすなわち流入口幅(W)の2/3と広くなされるとともに、これより奥側の二番目の組の左右一対の縦長分流板(24)(25)同士の間の排ガス通過用間隙(26)の左右幅が狭くすなわち流入口幅(W)の1/3と狭くなされて、排ガスの流量が調整されるようになされているものである(図2参照)。
【0021】
また、各組の左右一対の縦長分流板(21)(22)および縦長分流板(24)(25)の左右幅が、それぞれ上方に至るほど順次広いものとなされている。さらに、各組の左右一対の縦長分流板(21)(22)および縦長分流板(24)(25)の排ガス通過用間隙(23)(26)側の側縁部が、それぞれ垂直状となされ、各組の左右一対の縦長分流板(21)(22)および縦長分流板(24)(25)の排ガス通過用間隙(23)(26)と反対側の側縁部が、中央側の2つの角錐状ホッパゾーン(3B)(3C)の左右壁(14)(15)の内面に沿う傾斜状となされて、これら左右壁(14)(15)に固定されている(図3参照)。
【0022】
これに対し、排ガス浄化処理用バグフィルタケーシング(2)下部のホッパ部(3)の左右両外側の角錐状ホッパゾーン(3A)(3D)の内部には、ホッパゾーン(3A)(3D)の奥行き方向の長さ(L)を3等分する位置に、左右水平方向にのびる横長分流板(31)(32)が排ガス流入口(10)に対向するように配置されている。
【0023】
そして、これらの横長分流板(31)(32)は、その上端のレベルがそろえられるとともに、排ガス流入口(10)に最も近い横長分流板(31)の上下幅が狭くすなわち流入口高さ(H)の1/3と狭いものとなされ、かつ該横長分流板(31)より下側の排ガス通過用間隙(33)の上下幅が広いすなわち流入口高さ(H)の2/3と広いものとなされている。そして、これより奥の横長分流板(32)の上下幅が広くすなわち流入口高さ(H)の2/3と広いものとなされかつ該横長分流板(32)より下側の排ガス通過用間隙(34)の上下幅が狭いすなわち流入口高さ(H)の1/3と狭いものとなされて、排ガスの流量が調整されるようになされているものである(図3参照)。
【0024】
また、各横長分流板(31)(32)の排ガス通過用間隙(33)(34)側の下側縁部が水平状となされ、各横長分流板(31)(32)の左右両側縁部が、角錐状ホッパゾーン(3A)(3D)の左右壁の内面に沿う傾斜状となされている。
【0025】
上記排ガス浄化処理用バグフィルタ(1)において、ケーシング(2)下部のホッパ部(3)中央側の2つの角錐状ホッパゾーン(3B)(3C)においては、これらの排ガス流入口(10)から水平かつ前後方向に流入する排ガスが、流入口(10)より一番目の組の左右一対の縦長分流板(21)(22)に当たって上昇流へと流れの方向を転換せしめられる所定量の排ガス部分と、同組の左右一対の縦長分流板(21)(22)同士の間の排ガス通過用間隙(23)を通過する残部の排ガス部分とに分流せしめられる。
【0026】
さらに、排ガス通過用間隙(23)を通過した排ガス部分が、次の二番目の組の垂直方向にのびる左右一対の縦長分流板(24)(25)に当たって上昇流へと流れの方向を転換せしめられる所定量の排ガス部分と、同組の左右一対の縦長分流板(24)(25)同士の間の排ガス通過用間隙(26)を通過する残部の排ガス部分とに分流せしめられ、ついで、排ガス通過用間隙(26)を通過した排ガス部分が、最終的に、角錐状ホッパゾーン(3B)(3C)のテーパ状の後壁(12)に当たって上昇流へと流れの方向を転換せしめられて、流入排ガスが、ホッパ部(3)全体として均等に上昇流に転換せしめられるようになされている。
【0027】
これに対し、ケーシング(2)下部のホッパ部(3)左右両外側の角錐状ホッパゾーン(3A)(3D)においては、これらの排ガス流入口(10)から水平かつ前後方向に流入する排ガスが、排ガス流入口(10)より一番目の横長分流板(31)に当たって上昇流へと流れの方向を転換せしめられる所定量の排ガス部分と、横長分流板(31)より下側の排ガス通過用間隙(33)を通過する残部の排ガス部分とに分流せしめられる。
【0028】
さらに、排ガス通過用間隙(33)を通過した排ガス部分が、次の横長分流板(32)に当たって上昇流へと流れの方向を転換せしめられる所定量の排ガス部分と、同横長分流板(32)より下側の排ガス通過用間隙(34)を通過する残部の排ガス部分とに分流せしめられ、ついで、排ガス通過用間隙(34)を通過した排ガス部分が、最終的に、角錐状ホッパゾーン(3A)(3D)のテーパ状後壁(12)に当たって上昇流へと流れの方向を転換せしめられて、流入排ガスが、ホッパ部(3)全体として均等に上昇流に転換せしめられるようになされている。
【0029】
つぎに、図5は、上記本発明の排ガス浄化処理用バグフィルタ(1)のケーシング(2)下部のホッパ部(3)に、実際に排ガスを導入して、排ガスの浄化処理を行なった際の、排ガスの流速ベクトルを描写したフローパターンの解析結果を示すものである。
【0030】
同図から明らかなように、本発明の排ガス浄化処理用バグフィルタ(1)によれば、ケーシング(2)下部のホッパ部(3)を4つの角錐状ホッパゾーン(3A)(3B)(3C)(3D)に区分するとともに、これらの角錐状ホッパゾーン(3A)(3B)(3C)(3D)に、流入する排ガスの偏流状況に応じて、垂直方向にのびる縦長分流板(21)(22)(24)(25)、あるいはまた左右水平方向にのびる横長分流板(31)(32)を設けることにより、各角錐状ホッパゾーン(3A)(3B)(3C)(3D)の排ガス流入口(10)から見える縦長分流板(21)(22)(24)(25)あるいはまた横長分流板(31)(32)のそれぞれの投影面積分に衝突する排ガスが、分流板(21)(22)(24)(25)(31)(32)のところで一旦水平流に変化した後、上昇流となされ、これによって、排ガスは、上昇流、水平流ともに穏やかな流れになっている。
【0031】
こうして、本発明の排ガス浄化処理用バグフィルタ(1)によれば、ケーシング(2)内の排ガスの流れを緩和して、濾布(4)収容ゾーンにおいて均一な上昇流を生じるようにすることができ、これによって濾布(4)の摩耗・破損を防止することができて、濾布(4)の寿命が大幅に増大するものである。
【0032】
また、本発明の排ガス浄化処理用バグフィルタ(1)によれば、濾布(4)の取替え作業の軽減、および濾布(4)の使用枚数の削減が可能となり、運転コストを大幅に低減することができて、経済性が非常に高いものである。
【0033】
また、図6は、排ガス浄化処理用バグフィルタ(1)のケーシング(2)下部のホッパ部(3)内に、縦長分流板および横長分流板をいずれも設置していない参考の実験例を示すもので、ケーシング(2)下部のホッパ部(3)に、実際に排ガスを導入して、排ガスの浄化処理を行なった際の、排ガスの流速ベクトルを描写したフローパターンの解析結果を示すものである。
【0034】
同図から明らかなように、この場合には、ホッパ部(3)の各角錐状ホッパゾーン(3A)(3B)(3C)(3D)の排ガス流入口(10)から流入した排ガスは、その流速が減衰せず、排ガス流は、角錐状ホッパゾーン(3A)(3B)(3C)(3D)のテーパ状後壁(12)に当たって高速で上昇し、このため浄化処理用濾布(4)収容ゾーンでは、大きな横流れが生じており、多数の並列吊下げ状の浄化処理用濾布(4)が揺動して、濾布(4)の下端部にダメージを与える原因となっているものである。
【0035】
なお、上記実施形態においては、排ガス浄化処理用バグフィルタ(1)のケーシング(2)下部のホッパ部(3)が、4つの角錐状ホッパゾーン(3A)(3B)(3C)(3D)に区分されているが、ホッパ部(3)は、少なくとも3つの角錐状ホッパゾーン(3A)(3B)(3C)に区分されておれば良い。
【0036】
また、角錐状ホッパゾーン(3A)(3B)(3C)(3D)の内部に、奥行き方向に所定間隔おきに排ガス流入口(10)に対向するように配置される左右一対ずつの垂直方向にのびる縦長分流板(21)(22)(24)(25)の組数が、上記実施形態においては、2組であるが、排ガス浄化処理用バグフィルタ(1)のケーシング(2)下部のホッパ部(3)の大きさによっては、3〜5組であっても良い。
【0037】
また、角錐状ホッパゾーン(3A)(3B)(3C)(3D)の内部に、奥行き方向に所定間隔おきに排ガス流入口(10)に対向するように配置される左右水平方向にのびる横長分流板の枚数が、上記実施形態においては、2枚であるが、排ガス浄化処理用バグフィルタ(1)のケーシング(2)下部のホッパ部(3)の大きさによっては、3〜5枚であっても良い。
【0038】
ここで、例えば各角錐状ホッパゾーン(3A)(3B)(3C)(3D)の排ガス流入口(10)の流れにおいて、上下方向の偏流が大きく、左右水平方向の偏流が小さい場合には、垂直方向にのびる縦長分流板(21)(22)(24)(25)を設置するのが、効果的であり、逆に、左右水平方向の偏流が大きく、上下方向の偏流が小さい場合には、水平分流板(31)(32)を設置するのが、効果的である。
【0039】
また、縦長分流板(21)(22)(24)(25)あるいは横長分流板(31)(32)を設ける位置は、ホッパ部(3)内を均等に分割する位置が望ましく、また分流板の設置数も、多い方が排ガス流の流れを一様化する効果が大きいものであるが、排ガス浄化処理用バグフィルタ(1)のメンテナンスなどで作業者がホッパ部(3)内に入ることができる程度の間隔を確保する必要があり、分流板の設置数は、この作業性を考慮して決定すればよい。
【0040】
また、これらの縦長分流板(21)(22)(24)(25)および横長分流板(31)(32)の配置は、上記実施形態のものに限定されず、排ガス浄化処理用バグフィルタ(1)のケーシング(2)内の濾布収容ゾーンの排ガスの流れを緩和して、均一な上昇流を生じるように、適宜の配置が可能である。
【0041】
【発明の効果】
本発明の請求項1記載の排ガス浄化処理用バグフィルタは、上述のように、排ガス浄化処理用バグフィルタケーシング下部のホッパ部が、少なくとも3つの角錐状ホッパゾーンに区分され、各角錐状ホッパゾーンの前壁に、排ガス流入口が設けられ、中央側の角錐状ホッパゾーンの内部に、奥行き方向に所定間隔おきに左右一対ずつ複数組の垂直方向にのびる縦長分流板が排ガス流入口に対向するように配置され、左右両外側の角錐状ホッパゾーンの内部に、奥行き方向に所定間隔おきに左右水平方向にのびる横長分流板が排ガス流入口に対向するように配置され、排ガス流入口に最も近い左右水平方向にのびる横長分流板の上下幅が狭くかつ該横長分流板より下側の排ガス通過用間隙の上下幅が広いものとなされ、これより奥の左右水平方向にのびる横長分流板の上下幅が奥に至るものほど順次広いものとなされかつ該横長分流板より下側の排ガス通過用間隙の上下幅が奥に至るものほど順次狭いものとなされているもので、上記請求項1に記載の排ガス浄化処理用バグフィルタによれば、ケーシング下部のホッパ部中央側の角錐状ホッパゾーンにおいては、これらの排ガス流入口から水平かつ前後方向に流入する排ガスが、流入口より一番目の組の左右一対の縦長分流板に当たって上昇流へと流れの方向を転換せしめられる所定量の排ガス部分と、同組の左右一対の縦長分流板同士の間の排ガス通過用間隙を通過する残部の排ガス部分とに分流せしめられ、さらに、排ガス通過用間隙を通過した排ガス部分が、次の二番目の組の垂直方向にのびる左右一対の縦長分流板に当たって上昇流へと流れの方向を転換せしめられる所定量の排ガス部分と、同組の左右一対の縦長分流板同士の間の排ガス通過用間隙を通過する残部の排ガス部分とに分流せしめられ、ついで、排ガス通過用間隙を通過した排ガス部分が、最終的に、角錐状ホッパゾーンのテーパ状の後壁に当たって上昇流へと流れの方向を転換せしめられて、流入排ガスが、ホッパ部全体として均等に上昇流に転換せしめられるようになされている。
これに対し、ケーシング下部のホッパ部左右両外側の角錐状ホッパゾーンにおいては、これらの排ガス流入口から水平方向に流入する排ガスが、排ガス流入口より一番目の左右水平方向にのびる横長分流板に当たって上昇流へと流れの方向を転換せしめられる所定量の排ガス部分と、横長分流板より下側の排ガス通過用間隙を通過する残部の排ガス部分とに分流せしめられ、排ガス通過用間隙を通過した排ガス部分が、次の左右水平方向にのびる横長分流板に当たって上昇流へと流れの方向を転換せしめられる所定量の排ガス部分と、同横長分流板より下側の排ガス通過用間隙を通過する残部の排ガス部分とに分流せしめられ、排ガス通過用間隙を通過した排ガス部分が、以下順次同様に流れて、最終の横長分流板より下側の排ガス通過用間隙を通過した排ガス部分が、角錐状ホッパゾーンの後壁に当たって上昇流へと流れの方向を転換せしめられて、流入排ガスが、ホッパ部全体として均等に上昇流に転換せしめられるようになされていて、少なくとも3つの角錐状ホッパゾーンの排ガス流入口の流れにおいて、上下方向の偏流が大きく、左右水平方向の偏流が小さい場合には、垂直方向にのびる縦長分流板を設置するのが、効果的であり、逆に、左右水平方向の偏流が大きく、上下方向の偏流が小さい場合には、水平分流板を設置するのが、効果的であって、いずれにしても、ケーシングの下部のホッパ部内に、排ガスの流れに応じた形状および大きさの分流板を設けることにより、ケーシング内の排ガスの流れを緩和して、均一な上昇流を生じるようにすることができ、これによって濾布の摩耗および破損を可及的に防止することができて、濾布の寿命を大幅に増大することができるという効果を奏する。
【0042】
本発明の請求項2記載の排ガス浄化処理用バグフィルタは、上述のように、排ガス浄化処理用バグフィルタケーシング下部のホッパ部が4つの角錐状ホッパゾーンに区分され、各角錐状ホッパゾーンの前壁に、排ガス流入口が設けられ、中央側2つの角錐状ホッパゾーンの内部に、それぞれ奥行き方向に所定間隔おきに左右一対ずつ複数組の垂直方向にのびる縦長分流板が排ガス流入口に対向するように配置され、左右両外側の角錐状ホッパゾーンの内部に、それぞれ奥行き方向に所定間隔おきに左右水平方向にのびる横長分流板が排ガス流入口に対向するように配置され、排ガス流入口に最も近い左右水平方向にのびる横長分流板の上下幅が狭くかつ該横長分流板より下側の排ガス通過用間隙の上下幅が広いものとなされ、これより奥の左右水平方向にのびる横長分流板の上下幅が奥に至るものほど順次広いものとなされかつ該横長分流板より下側の排ガス通過用間隙の上下幅が奥に至るものほど順次狭いものとなされているもので、上記請求項2に記載の排ガス浄化処理用バグフィルタによれば、ケーシング下部のホッパ部中央側の2つの角錐状ホッパゾーンにおいては、これらの排ガス流入口から水平かつ前後方向に流入する排ガスが、流入口より一番目の組の左右一対の縦長分流板に当たって上昇流へと流れの方向を転換せしめられる所定量の排ガス部分と、同組の左右一対の縦長分流板同士の間の排ガス通過用間隙を通過する残部の排ガス部分とに分流せしめられ、さらに、排ガス通過用間隙を通過した排ガス部分が、次の二番目の組の垂直方向にのびる左右一対の縦長分流板に当たって上昇流へと流れの方向を転換せしめられる所定量の排ガス部分と、同組の左右一対の縦長分流板同士の間の排ガス通過用間隙を通過する残部の排ガス部分とに分流せしめられ、ついで、排ガス通過用間隙を通過した排ガス部分が、最終的に、角錐状ホッパゾーンのテーパ状の後壁に当たって上昇流へと流れの方向を転換せしめられて、流入排ガスが、ホッパ部全体として均等に上昇流に転換せしめられるようになされている。
これに対し、ケーシング下部のホッパ部左右両外側の角錐状ホッパゾーンにおいては、これらの排ガス流入口から水平方向に流入する排ガスが、排ガス流入口より一番目の左右水平方向にのびる横長分流板に当たって上昇流へと流れの方向を転換せしめられる所定量の排ガス部分と、横長分流板より下側の排ガス通過用間隙を通過する残部の排ガス部分とに分流せしめられ、排ガス通過用間隙を通過した排ガス部分が、次の左右水平方向にのびる横長分流板に当たって上昇流へと流れの方向を転換せしめられる所定量の排ガス部分と、同横長分流板より下側の排ガス通過用間隙を通過する残部の排ガス部分とに分流せしめられ、排ガス通過用間隙を通過した排ガス部分が、以下順次同様に流れて、最終の横長分流板より下側の排ガス通過用間隙を通過した排ガス部分が、角錐状ホッパゾーンの後壁に当たって上昇流へと流れの方向を転換せしめられて、流入排ガスが、ホッパ部全体として均等に上昇流に転換せしめられるようになされていて、4つの角錐状ホッパゾーンの排ガス流入口の流れにおいて、上下方向の偏流が大きく、左右水平方向の偏流が小さい場合には、垂直方向にのびる縦長分流板を設置するのが、効果的であり、逆に、左右水平方向の偏流が大きく、上下方向の偏流が小さい場合には、水平分流板を設置するのが、効果的であって、いずれにしても、ケーシングの下部のホッパ部内に、排ガスの流れに応じた形状および大きさの分流板を設けることにより、ケーシング内の排ガスの流れを緩和して、均一な上昇流を生じるようにすることができ、これによって濾布の摩耗および破損を可及的に防止することができて、濾布の寿命を大幅に増大することができるという効果を奏する。
【図面の簡単な説明】
【図1】 本発明の実施形態を示す排ガス浄化処理用バグフィルタの概略斜視図である。
【図2】 同バグフィルタのケーシング下部のホッパ部部分の拡大水平断面図である。
【図3】 図2イーイ線に沿う拡大垂直断面図である。
【図4】 図2ローロ線に沿う拡大垂直断面図である。
【図5】 本発明の排ガス浄化処理用バグフィルタの実験例を示すもので、ケーシング下部のホッパ部における排ガスの流速ベクトルを描写した拡大水平断面図である。
【図6】 排ガス浄化処理用バグフィルタの参考実験例を示すもので、排ガス浄化処理用バグフィルタ内には縦長分流板および横長分流板は設置されておらず、ケーシング下部のホッパ部における排ガスの流速ベクトルを描写した拡大水平断面図である。
【符号の説明】
(1) :排ガス浄化処理用バグフィルタ
(2) :ケーシング
(3) :ホッパ部
(L) :奥行き方向の長さ
(3A):角錐状ホッパゾーン
(3B):角錐状ホッパゾーン
(3C):角錐状ホッパゾーン
(3D):角錐状ホッパゾーン
(4) :浄化処理用濾布
(6) :排ガス導入ダクト
(8) :ヘッダ部
(9) :分岐ダクト
(10):排ガス流入口
(W) :流入口幅
(H) :流入口高さ
(11):テーパ状の前壁
(12):テーパ状の後壁
(13):底壁
(14):テーパ状の左壁
(15):テーパ状の右壁
(21):縦長分流板
(22):縦長分流板
(23):排ガス通過用間隙
(24):縦長分流板
(25):縦長分流板
(26):排ガス通過用間隙
(31):横長分流板
(32):横長分流板
(33):排ガス通過用間隙
(34):排ガス通過用間隙
[0001]
BACKGROUND OF THE INVENTION
  The present invention is for exhaust gas purification treatment used to remove harmful substances such as dust, sulfur oxide (SOx), hydrogen chloride (HCl), and dioxin contained in exhaust gas generated from, for example, an incinerator for municipal waste. It relates to bug filters.
[0002]
[Prior art]
  Conventionally, in this type of exhaust gas purifying bag filter, the exhaust gas to be treated flows from the inlet of the hopper portion at the lower part of the casing containing the purifying filter cloth, becomes an upward flow in the casing, and is suspended from the top of the casing. It passes through the gaps between the plurality of lowered filter cloths for purification treatment or the gaps between the cloths of the filter cloth itself. During this passage, slaked lime and special auxiliaries previously blown into the exhaust gas adhere to the filter cloth surface to form a harmful substance adsorption layer, and harmful substances in the passing exhaust gas are adsorbed on the surface of this adsorption layer. The exhaust gas is collected by the above, the exhaust gas is purified, and the purified exhaust gas is discharged to the outside from an outlet provided at the top of the casing.
[0003]
  And when the adsorption layer of the filter cloth surface becomes thick, the exhaust gas passage resistance (ventilation resistance) of the bag filter casing for exhaust gas purification treatment containing the filter cloth for purification treatment increases, and the pressure loss in the casing increases, Since the load on the blower increases, the compressed air is periodically sent to the blow tube from the header pipe provided in the bag filter casing for exhaust gas purification treatment, and the filter cloth is backwashed from the inside, and harmful from the filter cloth surface. The substance adsorbing layer is peeled off, and the harmful substance adsorbing layer mainly composed of the peeled slaked lime falls into the hopper part at the bottom of the casing and is stored there, after a predetermined period of time, as screw conveyor etc. Is taken out and processed.
[0004]
[Problems to be solved by the invention]
  In such a conventional exhaust gas purifying bag filter, the exhaust gas flowing into the hopper portion in the lower part of the casing in the horizontal direction (front-rear direction) from the inlet does not lose the momentum of the flow velocity at the inlet. It hits the back wall at the back of the slope, and it is made an upward flow from there and reaches the filter cloth containing zone for purification treatment at the upper part of the casing. At this time, the fine particles contained in the exhaust gas strongly collide with the filter cloth. There is a problem that the cloth is damaged, or the filter cloth is greatly swung by the exhaust gas flow and hits the inner wall of the casing, or the filter cloths are rubbed against each other to be worn and damaged.
[0005]
  In order to solve such a problem, it is possible to rectify the exhaust gas flowing in the front and rear horizontal direction into the hopper portion at the lower part of the casing of the exhaust gas purifying bag filter so as to convert it into a uniform upward flow in the hopper portion. is necessary.
[0006]
  However, the structure that makes the flow of exhaust gas uniform in the hopper part needs to be devised so that the inside of the hopper part is not clogged by the delamination of the harmful substance adsorption layer made of slaked lime etc. that has fallen during the backwashing of the filter cloth, It is necessary to have a structure that allows an operator to enter the casing or the hopper during the maintenance of the apparatus. Furthermore, if the exhaust gas is not sufficiently rectified in the duct leading to the inlet of the hopper, the flow of the exhaust gas flowing from the inlet of the hopper becomes an uneven flow. It is necessary to be.
[0007]
  Therefore, conventionally, a baffle plate for preventing direct inflow of exhaust gas has been provided in the vicinity of the inlet of the hopper portion at the bottom of the bag filter casing for exhaust gas purification treatment, but the flow of exhaust gas is made uniform throughout the casing. Therefore, there is a problem that it is difficult to make an upward flow.
[0008]
  The object of the present invention is to solve the above-mentioned problems of the prior art and provide a flow dividing plate having a shape and a size corresponding to the flow of exhaust gas in the hopper part at the bottom of the casing containing the filter cloth for purification treatment. The flow of exhaust gas in the casing can be relaxed to create a uniform upward flow, which can prevent the wear and breakage of the filter cloth as much as possible, greatly increasing the life of the filter cloth. It is possible to reduce the replacement work of the filter cloth and reduce the number of filter cloths used, which can greatly reduce the operating cost and is very economical, for exhaust gas purification treatment The goal is to provide a bug filter.
[0009]
[Means for Solving the Problems]
  In order to achieve the above object, the bag filter for exhaust gas purification treatment according to the first aspect of the present invention has a hopper portion at the lower part of the bag filter casing for exhaust gas purification treatment.The exhaust gas inlet is provided on the front wall of each pyramid-shaped hopper zone, and a plurality of pairs of left and right pairs are provided in the center-side pyramidal hopper zone at predetermined intervals in the depth direction. A vertically-divided vertical shunt plate is arranged so as to face the exhaust gas inlet, both left and right outsideIn the pyramid-shaped hopper zone, a horizontal flow-dividing plate extending in the horizontal direction at predetermined intervals in the depth direction is arranged so as to face the exhaust gas inlet, and the horizontal flow-dividing plate extending in the horizontal direction closest to the exhaust gas inlet is The vertical width is narrow and the vertical width of the exhaust gas passage gap below the horizontal diverting plate is widened, and the horizontal diverting plate extending in the horizontal direction at the back is gradually wider toward the back The vertical width of the exhaust gas passage gap below the horizontally long flow dividing plate is gradually narrowed toward the back.
[0010]
  According to the exhaust gas purifying bag filter according to claim 1 of the present invention,In the pyramid-shaped hopper zone at the center side of the hopper at the lower part of the casing, the exhaust gas flowing in horizontally and in the front-rear direction from these exhaust gas inlets strikes the first pair of left and right vertical shunt plates from the inlet and flows upward. And the remaining exhaust gas portion that passes through the exhaust gas passage gap between the pair of left and right longitudinally divided flow plates of the same pair, and further, the exhaust gas passage gap is further divided. The exhaust gas part that has passed passes through a second pair of left and right vertical shunt plates extending in the second set of vertical directions, and a predetermined amount of the exhaust gas part that changes the flow direction to an upward flow and a pair of left and right vertical shunts of the same set The remaining exhaust gas portion that passes through the exhaust gas passage gap between the plates is divided, and then the exhaust gas portion that has passed through the exhaust gas passage gap finally becomes a pyramid-shaped Pazon and a is caused to change direction of flow into the upward flow against the tapered rear wall of the inflow exhaust gas are adapted to be brought converted to evenly upward flow as a whole hopper.
On the other hand, in the pyramid-shaped hopper zones on the left and right outer sides of the hopper part at the lower part of the casing, theseExhaust gas flowing in horizontally from the exhaust gas inlet hits the first horizontal horizontal flow plate extending from the exhaust gas inlet to the left and right horizontal flow plate, and a predetermined amount of exhaust gas part that can change the flow direction to the upward flow, and from the horizontal flow distribution plate The remaining exhaust gas portion that passes through the lower exhaust gas passage gap is shunted, and the exhaust gas portion that has passed through the exhaust gas passage gap hits the next horizontally long horizontal split plate to change the flow direction to the upward flow. The predetermined amount of the exhaust gas portion to be converted and the remaining exhaust gas portion that passes through the exhaust gas passage gap below the horizontally long flow dividing plate, and the exhaust gas portion that has passed through the exhaust gas passage gap are sequentially the same in the following manner. The exhaust gas part that has flowed and passed through the exhaust gas passage gap below the final horizontally-divided flow plate hits the rear wall of the pyramid-shaped hopper zone and changes the flow direction to an upward flow. Crimped, the inflow exhaust gas are adapted to be brought uniformly converted into upflow entire hopper, is caused the effect that.
[0011]
  The bag filter for exhaust gas purification treatment according to claim 2 of the present invention has a hopper portion at the lower portion of the bag filter casing for exhaust gas purification treatment divided into four pyramidal hopper zones, and an exhaust gas inlet port is formed on the front wall of each pyramidal hopper zone. In the center two pyramid-shaped hopper zones, a pair of left and right vertical diverting plates extending in the depth direction at predetermined intervals are arranged so as to face the exhaust gas inlet. Inside the outer pyramid-shaped hopper zone, horizontal shunt plates that extend in the horizontal direction at predetermined intervals in the depth direction are arranged so as to face the exhaust gas inlet, and the horizontal shunt that extends in the horizontal direction closest to the exhaust gas inlet The vertical width of the plate is narrow and the vertical width of the gap for exhaust gas passage below the horizontally long flow dividing plate is widened. The vertical width of the horizontally-divided flow plate that extends is gradually increased toward the back, and the vertical width of the exhaust gas passage gap below the horizontally-divided flow plate is gradually decreased as the depth increases. It is a feature.
  The lower edge of each horizontal flow dividing plate on the exhaust gas passage gap side is horizontal, and the left and right side edges of each horizontal flow dividing plate are inclined along the inner surfaces of the left and right walls of the pyramidal hopper zone. Is preferred.
[0012]
  the aboveIt is preferable that the number of horizontally-divided flow plates extending in the left-right horizontal direction disposed so as to face the exhaust gas inlet at predetermined intervals in the depth direction in the pyramid-shaped hopper zone is 2 to 5.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
  Next, embodiments of the present invention will be described with reference to the drawings.
[0014]
  In this specification, front and rear, left and right are based on FIG. 2, front is the lower side of FIG. 2, rear is the same upper side, left is the left side of the figure, and right is the same right side. The upper side means the front side of the drawing sheet and the lower side means the back side.
[0015]
  1 to 4 show an embodiment of the present invention. Referring to the figure, the exhaust gas purifying bag filter (1) according to the present invention has a hopper (3) at the lower part of a casing (2) containing a large number of parallel suspended purifying filter cloths (4). It is divided into four pyramidal hopper zones (3A) (3B) (3C) (3D).
[0016]
  Here, each pyramidal hopper zone (3A) (3B) (3C) (3D) has tapered front and rear walls (11) and (12), a bottom wall (13), and tapered right and left walls (14) and (15). A rectangular exhaust gas inlet (10) is provided on the front wall (11) of each pyramidal hopper zone (3A) (3B) (3C) (3D). Of the four pyramidal hopper zones (3A), (3B), (3C), and (3D), the apex of the tapered right wall (15) and the tapered left wall (14) of the adjacent pyramidal hopper zones are intermediate. Is provided with a top wall (16) horizontal in the front-rear direction.
[0017]
  A header portion (8) is connected to an exhaust gas introduction duct (6) for introducing exhaust gas into each pyramidal hopper zone (3A) (3B) (3C) (3D) via an intermediate duct (7) extending downward. Four short branch ducts (9) are connected to the header portion (8), and the tip of each branch duct (9) is the front wall of the pyramidal hopper zones (3A) (3B) (3C) (3D). It communicates with the exhaust gas inlet (10) of (11).
[0018]
  On the other hand, a treated exhaust gas exhaust duct (5) for guiding the purified exhaust gas to the outside is provided at the top of the casing (2) containing the purification filter cloth (4) (see FIG. 4). .
[0019]
  Of the four pyramid-shaped hopper zones (3A), (3B), (3C), and (3D) of the exhaust gas purifying bag filter (1), two pyramid-shaped hopper zones (3B) on the center side of the hopper portion (3) ( 3C), in the position of dividing the length (L) in the depth direction of each hopper zone (3B) (3C) into three equal parts, a pair of left and right vertically extending flow dividing plates (21) (21) ( 22) and the vertically long flow dividing plates (24) and (25) are arranged so as to face the exhaust gas inlet (10).
[0020]
  Of these, the left-right width of the exhaust gas passage gap (23) between the pair of left and right longitudinally divided flow plates (21), (22) of the first set closest to the exhaust gas inlet (10) is wide, that is, the inlet width. The width of the exhaust gas passage gap (26) between the pair of left and right longitudinally divided flow plates (24) and (25) in the second set on the back side is widened. The flow rate is narrowed, that is, 1/3 of the inlet width (W), so that the flow rate of the exhaust gas is adjusted (see FIG. 2).
[0021]
  In addition, the left and right widths of the pair of left and right longitudinal shunt plates (21) and (22) and the longitudinal shunt plates (24) and (25) of each set are gradually increased toward the upper side. Further, the side edges of the pair of left and right longitudinal shunt plates (21) and (22) and the longitudinal shunt plates (24) and (25) on the side of the exhaust gas passage gap (23) and (26) are made vertical. The side edges of the pair of left and right longitudinal shunt plates (21) and (22) and the longitudinal shunt plates (24) and (25) opposite to the exhaust gas passage gaps (23) and (26) are the two on the center side. The two pyramid-shaped hopper zones (3B) and (3C) are inclined along the inner surfaces of the left and right walls (14) and (15), and are fixed to the left and right walls (14) and (15) (see FIG. 3).
[0022]
  On the other hand, the depth direction of the hopper zones (3A) (3D) is located inside the pyramid-shaped hopper zones (3A) (3D) on the left and right outer sides of the hopper portion (3) at the bottom of the bag filter casing (2) for exhaust gas purification treatment. Horizontally divided flow plates (31) and (32) extending in the left-right horizontal direction are arranged at positions to divide the length (L) into three equal parts so as to face the exhaust gas inlet (10).
[0023]
  These horizontally long flow dividing plates (31) and (32) have the same level at the upper end, and the vertical width of the horizontal long flow dividing plate (31) closest to the exhaust gas inlet (10) is narrow, that is, the inlet height ( H) is narrow and 1/3 of the horizontally long flow dividing plate (31), and the exhaust gas passage gap (33) has a wide vertical width, that is, 2/3 of the inlet height (H). It has been made. And the horizontal width of the horizontally long flow dividing plate (32) deeper than this is wide, that is, 2/3 of the inlet height (H), and the exhaust gas passage gap below the horizontal long flow dividing plate (32). The vertical width of (34) is narrow, that is, as narrow as 1/3 of the inlet height (H), so that the flow rate of the exhaust gas is adjusted (see FIG. 3).
[0024]
  Moreover, the lower edge of each horizontally long flow dividing plate (31) (32) on the exhaust gas passage gap (33) (34) side is made horizontal, and both left and right edges of each horizontally long flow dividing plate (31) (32) Are inclined along the inner surfaces of the left and right walls of the pyramidal hopper zones (3A) (3D).
[0025]
  In the exhaust gas purifying bag filter (1), in the two pyramid-shaped hopper zones (3B) and (3C) on the center side of the hopper part (3) at the lower part of the casing (2), the exhaust gas inlet (10) is horizontally disposed. And a predetermined amount of the exhaust gas portion that changes the flow direction to an upward flow when the exhaust gas flowing in the front-rear direction hits the first pair of left and right vertical flow separation plates (21), (22) from the inlet (10); The remaining exhaust gas portion that passes through the exhaust gas passage gap (23) between the pair of left and right longitudinally diverting plates (21) and (22) in the same group is divided.
[0026]
  Further, the portion of the exhaust gas that has passed through the exhaust gas passage gap (23) hits a pair of left and right longitudinally divided flow plates (24) and (25) extending in the vertical direction of the next second set to change the flow direction to an upward flow. And the remaining exhaust gas portion passing through the exhaust gas passage gap (26) between the pair of left and right longitudinally divided flow plates (24) and (25) of the same set, and then the exhaust gas portion. The part of the exhaust gas that has passed through the passage gap (26) finally hits the tapered rear wall (12) of the pyramid-shaped hopper zones (3B) (3C), and the direction of the flow is changed to an upward flow. The exhaust gas is uniformly converted into an upward flow as a whole of the hopper portion (3).
[0027]
  On the other hand, in the pyramid-shaped hopper zones (3A) and (3D) on the left and right outer sides of the hopper part (3) at the bottom of the casing (2), the exhaust gas flowing horizontally and in the front-rear direction from these exhaust gas inlets (10) A predetermined amount of exhaust gas portion that can change the flow direction to an upward flow from the exhaust gas inlet (10) to the first horizontally-divided plate (31), and an exhaust gas passage gap (below the horizontally-divided plate (31)) 33) to the remaining exhaust gas portion passing through.
[0028]
  Furthermore, the exhaust gas portion that has passed through the exhaust gas passage gap (33) hits the next horizontally long flow dividing plate (32) and changes the flow direction to the upward flow, and the horizontally long flow dividing plate (32). The remaining exhaust gas portion that passes through the lower exhaust gas passage gap (34) is shunted, and then the exhaust gas portion that has passed through the exhaust gas passage gap (34) finally becomes a pyramid-shaped hopper zone (3A). The direction of the flow is changed to an upward flow by hitting the tapered rear wall (12) of (3D), so that the inflowing exhaust gas is uniformly converted to the upward flow as the entire hopper portion (3).
[0029]
  Next, FIG. 5 shows the case where the exhaust gas is actually introduced into the hopper (3) below the casing (2) of the bag filter (1) for exhaust gas purification processing of the present invention and the exhaust gas purification treatment is performed. The flow pattern analysis result depicting the flow velocity vector of the exhaust gas is shown.
[0030]
  As is apparent from the figure, according to the bag filter for exhaust gas purification treatment (1) of the present invention, the hopper part (3) at the lower part of the casing (2) is divided into four pyramidal hopper zones (3A) (3B) (3C). (3D) and vertically dividing plates (21) (22) extending vertically in these pyramid-shaped hopper zones (3A), (3B), (3C), and (3D) depending on the state of drift of exhaust gas flowing into (24) (25), or by providing the horizontally long flow-dividing plates (31) (32) extending in the horizontal direction, the exhaust gas inlet (10) of each pyramidal hopper zone (3A) (3B) (3C) (3D) Exhaust gas that collides with the projected areas of the longitudinally diverted plates (21), (22), (24), and (25) or the horizontally elongated diverted plates (31) and (32) that can be seen from 24) (25 (31) (32) is once changed to a horizontal flow at the, and upflowMadeAs a result, the exhaust gas has a gentle flow in both the upward flow and the horizontal flow.
[0031]
  Thus, according to the bag filter for exhaust gas purification treatment (1) of the present invention, the flow of exhaust gas in the casing (2) is relaxed so that a uniform upward flow is generated in the filter cloth (4) containing zone. As a result, wear and breakage of the filter cloth (4) can be prevented, and the life of the filter cloth (4) is greatly increased.
[0032]
  Moreover, according to the bag filter (1) for exhaust gas purification treatment of the present invention, the replacement work of the filter cloth (4) can be reduced, and the number of filter cloths (4) used can be reduced, thereby greatly reducing the operating cost. Can be done and is very economical.
[0033]
  FIG. 6 shows a reference experimental example in which neither a vertically long diverting plate nor a horizontally long diverting plate is installed in the hopper portion (3) below the casing (2) of the bag filter (1) for exhaust gas purification treatment. This shows the flow pattern analysis result depicting the flow velocity vector of the exhaust gas when the exhaust gas is actually introduced into the hopper (3) at the bottom of the casing (2) and the exhaust gas is purified. is there.
[0034]
  As is apparent from the figure, in this case, the exhaust gas flowing in from the exhaust gas inlet (10) of each pyramidal hopper zone (3A) (3B) (3C) (3D) of the hopper (3) The exhaust gas flow rises at high speed against the tapered rear wall (12) of the pyramidal hopper zones (3A), (3B), (3C), and (3D). Then, a large lateral flow is generated, and a large number of parallel suspended filter cloths for purification (4) are swung to cause damage to the lower end of the filter cloth (4). .
[0035]
  In the above embodiment, the hopper (3) at the bottom of the casing (2) of the bag filter (1) for exhaust gas purification treatment is divided into four pyramidal hopper zones (3A) (3B) (3C) (3D). However, the hopper portion (3) may be divided into at least three pyramidal hopper zones (3A) (3B) (3C).
[0036]
  Further, a pair of left and right vertically extending in the pyramid-shaped hopper zones (3A), (3B), (3C), and (3D) are arranged at predetermined intervals in the depth direction so as to face the exhaust gas inlet (10). In the above-described embodiment, the number of sets of the vertically-divided flow plates (21), (22), (24), and (25) is two, but the hopper portion under the casing (2) of the bag filter (1) for exhaust gas purification treatment Depending on the size of (3), it may be 3 to 5 pairs.
[0037]
  Further, a horizontally long flow dividing plate extending in the horizontal direction in the pyramid-shaped hopper zones (3A), (3B), (3C), and (3D) is disposed so as to face the exhaust gas inlet (10) at predetermined intervals in the depth direction. The number of sheets is 2 in the above embodiment, but is 3 to 5 depending on the size of the hopper (3) at the bottom of the casing (2) of the bag filter (1) for exhaust gas purification treatment. Also good.
[0038]
  Here, for example, in the flow of the exhaust gas inlet (10) in each pyramidal hopper zone (3A) (3B) (3C) (3D), vertical drift is large, and horizontal drift in the horizontal direction is small. It is effective to install longitudinally diverting plates (21), (22), (24), and (25) that extend in the direction. Conversely, when the horizontal and horizontal drifts are large and the vertical drift is small, It is effective to install the horizontal flow dividing plates (31) and (32).
[0039]
  Further, the position where the vertically long diverting plates (21) (22) (24) (25) or the horizontally long diverting plates (31) (32) are provided is preferably a position where the inside of the hopper (3) is equally divided. The larger the number of installations, the greater the effect of equalizing the flow of the exhaust gas flow, but the worker enters the hopper (3) for maintenance of the exhaust gas purification bag filter (1). It is necessary to secure an interval that can prevent the problem, and the number of distribution plates to be installed may be determined in consideration of this workability.
[0040]
  Further, the arrangement of the vertically-divided flow plates (21), (22), (24), and (25) and the horizontally long flow-dividing plates (31) and (32) is not limited to that of the above embodiment, and the exhaust gas purifying bag filter ( Appropriate arrangement is possible so as to reduce the flow of exhaust gas in the filter cloth housing zone in the casing (2) of 1) and to generate a uniform upward flow.
[0041]
【The invention's effect】
  As described above, the bag filter for exhaust gas purification treatment according to claim 1 of the present invention has a hopper portion at the lower part of the bag filter casing for exhaust gas purification treatment.The exhaust gas inlet is provided on the front wall of each pyramidal hopper zone, and a plurality of pairs of left and right pairs are provided in the central pyramidal hopper zone at predetermined intervals in the depth direction. A vertically-divided vertical shunt plate is arranged so as to face the exhaust gas inlet, both left and right outsideIn the pyramid-shaped hopper zone, a horizontal flow-dividing plate extending in the horizontal direction at predetermined intervals in the depth direction is arranged so as to face the exhaust gas inlet, and the horizontal flow-dividing plate extending in the horizontal direction closest to the exhaust gas inlet is The vertical width is narrow and the vertical width of the exhaust gas passage gap below the horizontal diverting plate is widened, and the horizontal diverting plate extending in the horizontal direction at the back is gradually wider toward the back And the vertical width of the exhaust gas passage gap below the horizontally long flow dividing plate is gradually narrowed toward the back,Claim 1 aboveAccording to the exhaust gas purifying bag filter ofIn the pyramid-shaped hopper zone at the center of the hopper at the lower part of the casing, the exhaust gas flowing in horizontally and in the front-rear direction from these exhaust gas inlets strikes the first pair of left and right vertical shunt plates from the inlet and flows upward. And the remaining exhaust gas portion that passes through the exhaust gas passage gap between the pair of left and right vertical flow separation plates of the same pair, and further, the exhaust gas passage gap is further divided. The exhaust gas part that has passed passes through a second pair of left and right vertical shunt plates that extend in the second set of vertical directions, and a predetermined amount of exhaust gas part that changes the flow direction to an upward flow and a pair of left and right vertical shunts of the same set The remaining exhaust gas portion that passes through the exhaust gas passage gap between the plates is divided, and then the exhaust gas portion that has passed through the exhaust gas passage gap finally becomes a pyramid-shaped Pazon and a is caused to change direction of flow into the upward flow against the tapered rear wall of the inflow exhaust gas are adapted to be brought converted to evenly upward flow as a whole hopper.
On the other hand, in the pyramid-shaped hopper zones on the left and right outer sides of the hopper part at the lower part of the casing, theseExhaust gas flowing in horizontally from the exhaust gas inlet hits the first horizontal horizontal flow plate extending from the exhaust gas inlet to the left and right horizontal flow plate, and a predetermined amount of exhaust gas part that can change the flow direction to the upward flow, and from the horizontal flow distribution plate The remaining exhaust gas portion that passes through the lower exhaust gas passage gap is shunted, and the exhaust gas portion that has passed through the exhaust gas passage gap hits the next horizontally long horizontal split plate to change the flow direction to the upward flow. The predetermined amount of the exhaust gas portion to be converted and the remaining exhaust gas portion that passes through the exhaust gas passage gap below the horizontally long flow dividing plate, and the exhaust gas portion that has passed through the exhaust gas passage gap are sequentially the same in the following manner. The exhaust gas part that has flowed and passed through the exhaust gas passage gap below the final horizontally-divided flow plate hits the rear wall of the pyramid-shaped hopper zone and changes the flow direction to an upward flow. Crimped, the inflow exhaust gas, have been adapted to be brought converted to evenly upward flow as a whole hopper,At least threeIn the flow of the exhaust gas inlet of the pyramid-shaped hopper zone, if the vertical drift is large and the horizontal drift is small, it is effective to install a vertical shunt plate extending in the vertical direction. If the horizontal drift in the horizontal direction is large and the vertical drift is small, it is effective to install a horizontal flow dividing plate, and in any case, the flow of exhaust gas in the hopper at the bottom of the casing By providing a diverter plate with a shape and size according to the size, it is possible to reduce the flow of exhaust gas in the casing so as to generate a uniform upward flow, thereby allowing the filter cloth to be worn and damaged. Can be prevented and the life of the filter cloth can be greatly increased.
[0042]
  In the exhaust gas purifying bag filter according to claim 2 of the present invention, as described above, the hopper portion at the lower part of the exhaust gas purifying bag filter casing is divided into four pyramidal hopper zones, and is formed on the front wall of each pyramidal hopper zone. The exhaust gas inlet is provided and arranged in the center two pyramid-shaped hopper zones such that a plurality of pairs of vertical shunts extending in the vertical direction at predetermined intervals in the depth direction face the exhaust gas inlet. In the pyramid-shaped hopper zones on the left and right outer sides, a horizontally-divided flow plate extending in the left and right horizontal directions at predetermined intervals in the depth direction is arranged so as to face the exhaust gas inlet, and the horizontal direction closest to the exhaust gas inlet The vertical flow width of the horizontal shunt plate is narrow and the exhaust gas passage gap below the horizontal shunt plate is wide, and the left As the vertical width of the horizontally long flow dividing plate extending in the horizontal direction reaches the back, the width gradually becomes wider, and as the vertical width of the exhaust gas passage gap below the horizontal flow dividing plate reaches the back, the width becomes gradually narrower. Therefore, according to the bag filter for exhaust gas purification processing according to claim 2, in the two pyramid-shaped hopper zones on the center side of the hopper part at the lower part of the casing, the exhaust gas flowing horizontally and in the front-rear direction from these exhaust gas inlets However, the exhaust gas passes between a predetermined amount of exhaust gas portion which can change the direction of the flow into the upward flow by hitting the first pair of left and right vertical shunt plates from the inlet and the pair of left and right vertical shunt plates of the same set The remaining exhaust gas portion that passes through the gap for the exhaust gas is further diverted to the remaining exhaust gas portion, and the exhaust gas portion that has passed through the exhaust gas passage gap extends in the next second set of vertical pairs. The exhaust gas is diverted into a predetermined amount of exhaust gas part that can change the flow direction to the upward flow when it hits the flow plate, and the remaining exhaust gas part that passes through the exhaust gas passage gap between the pair of left and right vertical shunt plates of the same set. Then, the exhaust gas portion that has passed through the exhaust gas passage gap finally hits the tapered rear wall of the pyramid-shaped hopper zone, and the direction of the flow is changed to an upward flow so that the inflow exhaust gas is evenly distributed throughout the hopper section. It is designed to be converted into an upward flow.
On the other hand, in the pyramid-shaped hopper zones on the left and right outer sides of the hopper part at the lower part of the casing, the exhaust gas flowing in horizontally from these exhaust gas inlets rises by hitting the first horizontal shunt plate extending in the left and right horizontal direction from the exhaust gas inlet. Exhaust gas part that is diverted into a predetermined amount of exhaust gas part that can change the flow direction into a flow, and the remaining exhaust gas part that passes through the exhaust gas passage gap below the horizontally-divided split plate, and that has passed through the exhaust gas passage gap Is a predetermined amount of exhaust gas portion that can change the direction of the flow into the upward flow by hitting the next horizontal flow plate extending in the left and right horizontal direction, and the remaining exhaust gas portion that passes through the exhaust gas passage gap below the horizontal flow distribution plate After that, the exhaust gas part that has been divided into two parts and passed through the exhaust gas passage gap flows in the same manner in the following order, and the exhaust gas passage part below the last horizontally long diverting plate. The exhaust gas portion that has passed through the rear side of the pyramid hits the rear wall of the pyramid-shaped hopper zone to change the flow direction to the upward flow, and the inflowing exhaust gas is uniformly converted to the upward flow as the entire hopper portion. In the flow at the exhaust gas inlet of the two pyramid-shaped hopper zones, when the vertical drift is large and the horizontal drift is small, it is effective to install a vertically-divided vertical shunt plate. If the horizontal drift in the horizontal direction is large and the vertical drift is small, it is effective to install a horizontal flow dividing plate, and in any case, the flow of exhaust gas in the hopper at the bottom of the casing By providing a diverter plate having a shape and size according to the size, the flow of exhaust gas in the casing can be relaxed so that a uniform upward flow can be generated. And it is possible to prevent wear and damage as much as possible, an effect that the filter cloth life can be greatly increased.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of an exhaust gas purifying bag filter showing an embodiment of the present invention.
FIG. 2 is an enlarged horizontal sectional view of a hopper portion at a lower portion of the casing of the bag filter.
FIG. 3 is an enlarged vertical sectional view taken along the line II in FIG. 2;
FIG. 4 is an enlarged vertical sectional view taken along the line 2 in FIG. 2;
FIG. 5 shows an experimental example of the bag filter for exhaust gas purification treatment of the present invention, and is an enlarged horizontal sectional view depicting a flow velocity vector of exhaust gas in a hopper part at the lower part of the casing.
FIG. 6 shows a reference experimental example of an exhaust gas purification treatment bag filter. In the exhaust gas purification treatment bag filter, a vertical shunt plate and a horizontal shunt plate are not installed. FIG. 3 is an enlarged horizontal sectional view depicting a flow velocity vector.
[Explanation of symbols]
(1): Bag filter for exhaust gas purification treatment
(2): Casing
(3): Hopper section
(L): Length in the depth direction
(3A): Pyramidal hopper zone
(3B): Pyramidal hopper zone
(3C): Pyramidal hopper zone
(3D): Pyramidal hopper zone
(4): Filter cloth for purification treatment
(6): Exhaust gas introduction duct
(8): Header part
(9): Branch duct
(10): Exhaust gas inlet
(W): Inlet width
(H): Inlet height
(11): Tapered front wall
(12): Tapered rear wall
(13): Bottom wall
(14): Tapered left wall
(15): Tapered right wall
(21): Longitudinal shunt plate
(22): Longitudinal shunt plate
(23): Exhaust gas passage gap
(24): Longitudinal shunt plate
(25): Longitudinal shunt plate
(26): Exhaust gas passage gap
(31): Horizontally diverted plate
(32): Horizontally long flow dividing plate
(33): Exhaust gas passage gap
(34): Exhaust gas passage gap

Claims (4)

排ガス浄化処理用バグフィルタケーシング下部のホッパ部が、少なくとも3つの角錐状ホッパゾーンに区分され、各角錐状ホッパゾーンの前壁に、排ガス流入口が設けられ、中央側の角錐状ホッパゾーンの内部に、奥行き方向に所定間隔おきに左右一対ずつ複数組の垂直方向にのびる縦長分流板が排ガス流入口に対向するように配置され、左右両外側の角錐状ホッパゾーンの内部に、奥行き方向に所定間隔おきに左右水平方向にのびる横長分流板が排ガス流入口に対向するように配置され、排ガス流入口に最も近い左右水平方向にのびる横長分流板の上下幅が狭くかつ該横長分流板より下側の排ガス通過用間隙の上下幅が広いものとなされ、これより奥の左右水平方向にのびる横長分流板の上下幅が奥に至るものほど順次広いものとなされかつ該横長分流板より下側の排ガス通過用間隙の上下幅が奥に至るものほど順次狭いものとなされていることを特徴とする、排ガス浄化処理用バグフィルタ。The hopper part at the bottom of the bag filter casing for exhaust gas purification treatment is divided into at least three pyramidal hopper zones, an exhaust gas inlet is provided on the front wall of each pyramidal hopper zone, and the depth inside the pyramidal hopper zone on the center side A plurality of vertical elongated flow -dividing plates extending in pairs in the vertical direction at predetermined intervals in the direction are arranged so as to face the exhaust gas inlet, and are arranged in the pyramid-shaped hopper zones on the left and right outer sides at predetermined intervals in the depth direction. A horizontally-divided plate that extends horizontally is arranged to face the exhaust gas inlet, and the vertical width of the horizontally-divided plate that extends in the horizontal direction closest to the exhaust gas inlet is narrow and is for exhaust gas passage below the horizontally-divided plate. Is the width of the gap widened, and the width of the horizontally-divided flow plate extending in the horizontal direction behind it is gradually increased toward the back? Wherein the vertical width of the lower side of the exhaust gas passage for clearance than lateral length diverter plate is made as successively narrower as those leading to the back, bag filter for exhaust gas purification treatment. 排ガス浄化処理用バグフィルタケーシング下部のホッパ部が4つの角錐状ホッパゾーンに区分され、各角錐状ホッパゾーンの前壁に、排ガス流入口が設けられ、中央側2つの角錐状ホッパゾーンの内部に、それぞれ奥行き方向に所定間隔おきに左右一対ずつ複数組の垂直方向にのびる縦長分流板が排ガス流入口に対向するように配置され、左右両外側の角錐状ホッパゾーンの内部に、それぞれ奥行き方向に所定間隔おきに左右水平方向にのびる横長分流板が排ガス流入口に対向するように配置され、排ガス流入口に最も近い左右水平方向にのびる横長分流板の上下幅が狭くかつ該横長分流板より下側の排ガス通過用間隙の上下幅が広いものとなされ、これより奥の左右水平方向にのびる横長分流板の上下幅が奥に至るものほど順次広いものとなされかつ該横長分流板より下側の排ガス通過用間隙の上下幅が奥に至るものほど順次狭いものとなされていることを特徴とする、排ガス浄化処理用バグフィルタ。 The hopper at the bottom of the bag filter casing for exhaust gas purification treatment is divided into four pyramidal hopper zones, and an exhaust gas inlet is provided on the front wall of each pyramidal hopper zone. A plurality of vertically-divided vertically-divided flow plates are arranged so as to face the exhaust gas inlet, with a pair of left and right pairs at predetermined intervals in the direction, and inside the pyramidal hopper zones on the left and right outer sides, at predetermined intervals in the depth direction. A horizontally-divided plate extending in the left-right horizontal direction is arranged to face the exhaust gas inlet, and the vertical width of the horizontally-divided plate extending in the horizontal direction closest to the exhaust gas inlet is narrow and the exhaust gas passes below the horizontally-divided plate. The vertical width of the gap for use is made wider, and the vertical width of the horizontally long flow-dividing plate extending in the horizontal direction at the back is gradually increased toward the back. It is and wherein the vertical width of the lower side of the exhaust gas passage for clearance than lateral length diverter plate is made as successively narrower as those leading to the back, bag filter for exhaust gas purification treatment. 各横長分流板の排ガス通過用間隙側の下側縁部が水平状となされ、各横長分流板の左右両側縁部が、角錐状ホッパゾーンの左右壁の内面に沿う傾斜状となされている請求項1または2に記載の排ガス浄化処理用バグフィルタ。 The lower side edge of each horizontally long diverting plate on the exhaust gas passage gap is horizontal, and the left and right side edges of each horizontally diverting plate are inclined along the inner surfaces of the left and right walls of the pyramidal hopper zone. The bag filter for exhaust gas purification treatment according to 1 or 2 . 角錐状ホッパゾーンの内部に、奥行き方向に所定間隔おきに排ガス流入口に対向するように配置される左右水平方向にのびる横長分流板の枚数が、2〜5枚である、請求項1〜3のうちのいずれか一項に記載の排ガス浄化処理用バグフィルタ。 The number of horizontally long flow-dividing plates extending in the left-right horizontal direction disposed so as to face the exhaust gas inlet at predetermined intervals in the depth direction inside the pyramid-shaped hopper zone is 2-5. The bag filter for exhaust gas purification treatment as described in any one of them .
JP2002166968A 2002-06-07 2002-06-07 Bag filter for exhaust gas purification treatment Expired - Fee Related JP4284459B2 (en)

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