JPWO2003099416A1 - Honeycomb filter and manufacturing method thereof, filter holder, backwash device, and dust collecting device - Google Patents

Honeycomb filter and manufacturing method thereof, filter holder, backwash device, and dust collecting device Download PDF

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JPWO2003099416A1
JPWO2003099416A1 JP2004506936A JP2004506936A JPWO2003099416A1 JP WO2003099416 A1 JPWO2003099416 A1 JP WO2003099416A1 JP 2004506936 A JP2004506936 A JP 2004506936A JP 2004506936 A JP2004506936 A JP 2004506936A JP WO2003099416 A1 JPWO2003099416 A1 JP WO2003099416A1
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filter
honeycomb filter
honeycomb
outer frame
cell
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JP4685444B2 (en
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堀　義明
義明 堀
八代　和正
和正 八代
文康 永井
文康 永井
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NGK Insulators Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2068—Other inorganic materials, e.g. ceramics
    • B01D39/2093—Ceramic foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2484—Cell density, area or aspect ratio
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0002—Casings; Housings; Frame constructions
    • B01D46/0013—Modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2455—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the whole honeycomb or segments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2482—Thickness, height, width, length or diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2418—Honeycomb filters
    • B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
    • B01D46/2486—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure characterised by the shapes or configurations

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  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Filtering Materials (AREA)

Abstract

本発明のハニカムフィルタ１は、多孔質構造を有する隔壁２によってハニカム形状に仕切られた、流体の流路となる複数のセル３を備え、所定のセル３の一方のセル開口部と、残余のセル３の他方のセル開口部に交互に形成された目封じ部１０により、隔壁２が濾過層として機能する、セラミックスからなる筒状のハニカムフィルタ１であり、その一方の筒端面４から他方の筒端面５までの長さが５００〜１０００ｍｍ、筒端面の最大外寸が２００〜３５０ｍｍ、及び濾過層の濾過面積が４ｍ２以上であることを特徴とし、排ガスの処理能力が大きく、主として集塵装置用のフィルタとして好適な特性を有するものである。A honeycomb filter 1 according to the present invention includes a plurality of cells 3 serving as fluid flow paths, which are partitioned into a honeycomb shape by partition walls 2 having a porous structure, and includes one cell opening portion of a predetermined cell 3 and the remaining cells. A cylindrical honeycomb filter 1 made of ceramics in which the partition wall 2 functions as a filtration layer by the plugged portions 10 alternately formed in the other cell opening of the cell 3, from one cylinder end surface 4 to the other The length to the cylinder end surface 5 is 500 to 1000 mm, the maximum outer dimension of the cylinder end surface is 200 to 350 mm, and the filtration area of the filtration layer is 4 m 2 or more. It has a characteristic suitable as a filter for use.

Description

技術分野
本発明は、ハニカムフィルタとその製造方法、このハニカムフィルタを用いたフィルタ保持体、逆洗装置、及びこれらを用いた集塵装置に関し、更に詳しくは、特に処理容量の大きい集塵装置用のフィルタとして好適な特性を有する大型のハニカムフィルタとその製造方法、フィルタ保持体、逆洗装置、及びこれらを組み合わせた、処理能力の高い集塵装置に関する。
背景技術
従来、集塵装置に用いられるフィルタは、紙、繊維、又は高分子樹脂等を使用してなるバグフィルタが主流であったが、近年、公害防止等の環境対策、高温ガスからの製品回収、及びクリーンな高温エネルギー回収等の観点から、従来のバグフィルタが使用可能となる温度域（低温域）だけでなく、バグフィルタが使用不可能となる２５０℃以上の温度域（高温域）における集塵作業が必要とされる市場が拡大しつつある。
このような状況下、セラミックスは耐熱性及び耐食性に優れているとともに、従来の低温域は勿論のこと、高温、腐食性ガス等に暴露される雰囲気下においても用いられるフィルタ材料として好ましい特性を有しており、各種のセラミックスフィルタとして利用されている。このようなセラミックスフィルタを用いた集塵において、ガス中のダストは、上流側から入り、ガスが多孔質の隔壁を通って下流側の穴より抜けていく際に、濾過面の表面上に捕捉される。
現在、セラミックスフィルタの形状としては、管状、又は一方が閉じた有底管状であるキャンドルタイプと呼ばれる形状のもの等を挙げることができるが、中でも、ハニカム構造を有するフィルタ（ハニカムフィルタ）は、単位体積当りの濾過面積が広く集塵効率に優れているために、化学、電力、鉄鋼、産業廃棄物処理の分野等、多岐に渡る分野において採用される集塵装置用のフィルタとして好適な特性を有するものである。
なお、図４に示すように、ハニカムフィルタ１は、多数のセル３のセル開口部の上流側Ｂと下流側Ｃとを一マスごと交互に封じた構造を有し、上流側Ｂから入ったガスは、多孔質の隔壁２を通って下流側Ｃの穴より抜けていくが、その際に、ガス中のダストは隔壁２の表面上に捕捉される。
集塵装置の処理能力をより高めるためには、フィルタの濾過面積を広くする必要がある。このために、従来、複数のハニカムフィルタを、これらのセルが平行となるように組み合わせたフィルタブロックを作製し、これをフィルタとして装置に組み込むことにより、フィルタの濾過面積を広くするといった対策がなされることが一般的である（例えば、特許第１９３３４２５号明細書参照）。
しかしながら、複数のハニカムフィルタを組み合わせてフィルタブロックを作製するには、複数の工程及び多大な労力が必要とされるといった問題がある。このため、複数のハニカムフィルタを組み合わせる必要のない、より濾過面積の広い大型のフィルタハニカムを製造し、これをフィルタとして装置に組み込むことを、前述の問題を解消するための対策として挙げることができる。
しかし、より大型のハニカムフィルタを製造しようとすると、乾燥・焼成前の成形体が自重により変形し易いといった問題があり、セルのつぶれや変形、又はハニカムフィルタ全体の変形等の不具合を生ずることなく、ハニカムフィルタを製造することは極めて困難であった。従って、ハニカムフィルタどうしを組み合わせてフィルタブロックを作製することなく、所望とする、十分に広い濾過面積を有するフィルタを提供することは極めて困難であり、従来どおり、労力を費やしてフィルタブロックを作製せざるを得ないのが現状であった。
なお、ハニカムフィルタやフィルタブロックを集塵装置等に組み込むに際しては、組み込み作業の都合上、及び未処理ガスと処理済ガスとの混合防止等の観点から、ハニカムフィルタ等を金属製の外枠体の内部に保持してフィルタ保持体とし、これを組み込むことが一般的である。しかし、ハニカムフィルタやフィルタブロックが大型化するに従い、これらを保持するための外枠体も大型になり、その重量が増加する。このため、外枠体への保持の信頼性、取扱いの容易性等に問題を生ずる場合も想定される。
通常、集塵装置等に組み込まれるフィルタには、排ガスの流路方向とは逆方向の圧縮空気を導入し、フィルタに捕捉された捕捉物（ダスト等）を定期的に除去する、いわゆる逆洗を行う。図１０は、従来の逆洗装置をフィルタブロックに取り付けた状態を模式的に示す斜視図である。ここでも、フィルタブロック７等のフィルタが大型化するに従い、逆洗装置４０も大型化してその重量が増加し、集塵装置に組み込むことが困難となる。また、逆洗装置４０における、フィルタブロック７に圧縮空気を導入するための空間が増大してしまうために圧力上昇が遅く、効果的な逆洗を行い難いといった問題があった。
本発明は、このような従来技術の有する問題点に鑑みてなされたものであり、その目的とするところは、大型で、濾過面積が極めて広いハニカムフィルタ、前記ハニカムフィルタを、セルやその全体に変形やつぶれ等の不具合を生ずることなく製造する方法、外枠体への保持の信頼性及び取扱い容易性に優れたフィルタ保持体、軽量であるとともに逆洗効率に優れた逆洗装置、及び処理能力が高く、信頼性に優れた集塵装置を提供することにある。
発明の開示
即ち、本発明によれば、多孔質構造を有する隔壁によってハニカム形状に仕切られた、流体の流路となる複数のセルを備え、所定の前記セルの一方のセル開口部と、残余の前記セルの他方のセル開口部に交互に形成された目封じ部により、前記隔壁が濾過層として機能する、セラミックスからなる筒状のハニカムフィルタであって、その一方の筒端面から他方の筒端面までの長さが５００〜１０００ｍｍ、前記筒端面の最大外寸が２００〜３５０ｍｍ、及び前記濾過層の濾過面積が４ｍ２以上であることを特徴とするハニカムフィルタが提供される。
本発明においては、セラミックスが、コーディエライトであることが好ましく、隔壁の少なくとも一方の表面上に、一又は二層以上のフィルタ層を備えることが好ましい。
また、本発明によれば、セラミックス原料を含む原料混合物からなる成形用坏土を、重力方向に押し出して、隔壁によって仕切られた流体の流路となる複数のセルを備えたハニカム形状の成形体を形成するとともに、押出し方向に配置した網目状の底部を備えた受缶内に収納し、前記成形体を前記受缶内に収納した状態で、複数の前記セルに通風することにより前記成形体を乾燥して乾燥体を得、前記乾燥体の所定の前記セルの一方のセル開口部と、残余の前記セルの他方のセル開口部に目封じ材を圧入した後、焼成することにより、前記隔壁が濾過層として機能するハニカムフィルタを得ることを特徴とするハニカムフィルタの製造方法が提供される。
また、本発明によれば、いずれかの前記ハニカムフィルタの外周面と、金属からなる筒状の外枠体の内周面との間に緩衝材を備え、前記緩衝材が圧縮された状態で、前記外枠体の内部に前記ハニカムフィルタが保持されてなるとともに、前記外枠体の、少なくとも一方の筒端縁又はその近傍に、前記外枠体の中心軸方向に延伸又は屈曲する、前記ハニカムフィルタの脱落防止部を備え、かつ、前記脱落防止部と、前記ハニカムフィルタの少なくとも一方の前記筒端面の外縁部との間に、前記緩衝材又は前記緩衝材とは別体の外縁部緩衝材を備えることを特徴とするフィルタ保持体が提供される。
本発明においては、外枠体の、少なくとも一方の筒端縁又はその近傍の外周面上にフランジを備えることが好ましく、外枠体の厚さが１ｍｍ以下であることが好ましく、外枠体及びハニカムフィルタの形状が円筒状であることが好ましい。
また、本発明によれば、集塵装置に配置されるハニカムフィルタのガス流路の下流側に設置され、前記下流側から前記ハニカムフィルタに圧縮空気を導入することにより、前記ハニカムフィルタに捕捉された捕捉物を除去する逆洗装置であって、前記圧縮空気の流路となる円筒状の本流路管と、一方の端部が前記本流路管の側面部に連結するとともに、前記ハニカムフィルタとの接続手段を有する、一以上の筒状の支流路管と、前記本流路管に圧縮空気を導入するように配設された圧縮空気導入手段とを備えてなることを特徴とする逆洗装置が提供される。
更に、本発明によれば、ガス流路と、前記ガス流路に、前記ハニカムフィルタの一方の前記筒端面より被処理排ガスが流入し、他方の前記筒端面より処理済ガスが排出するように設置されたいずれかの前記フィルタ保持体と、前記フィルタ保持体に保持された前記ハニカムフィルタの、他方の前記筒端面に接続され、前記ハニカムフィルタの逆洗を行う前記逆洗装置とを備えることを特徴とする集塵装置が提供される。
発明を実施するための最良の形態
以下、本発明の実施の形態について説明するが、本発明は以下の実施の形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で、当業者の通常の知識に基づいて、適宜、設計の変更、改良等が加えられることが理解されるべきである。
本発明は、多孔質構造を有する隔壁によってハニカム形状に仕切られた、流体の流路となる複数のセルを備え、所定のセルの一方のセル開口部と、残余のセルの他方のセル開口部に交互に形成された目封じ部により、隔壁が濾過層として機能する、セラミックスからなる筒状のハニカムフィルタであり、その一方の筒端面から他方の筒端面までの長さが５００〜１０００ｍｍ、筒端面の最大外寸が２００〜３５０ｍｍ、及び濾過層の濾過面積が４ｍ２以上であることを特徴とするものである。以下、その詳細について説明する。
図１は、本発明のハニカムフィルタの一実施形態を示す模式図である。本実施の形態であるハニカムフィルタ１は、流体の流路となる複数のセル３を備えており、これらのセル３は、隔壁２によってハニカム形状に仕切られることにより構成されている。また、隔壁２は、その一方の表面から他方の表面に連通する、濾過能を有する微細な孔（連通孔）を多数備えた多孔質構造を有している。
所定のセルの一方のセル開口部には、目封じ部１０が形成されている。また、前述の所定のセル以外の、残余のセルの他方のセル開口部にも同様に、目封じ部１０が形成されている。このような状態で目封じ部１０が形成されることにより、一方の筒端面４から進入した排ガスは多孔質の隔壁２を濾過層とし、排ガス中のダストは隔壁２の表面上に捕捉される。ダストが除去されたクリーンなガスは、他方の筒端面５から排出される。
本発明のハニカムフィルタは、図１及び図２に示すように、その一方の筒端面４から他方の筒端面５までの長さＸ（以下、「全長」と記す）が５００〜１０００ｍｍ、筒端面の最大外寸Ｙ（以下、単に「最大外寸」と記す）が２００〜３５０ｍｍφ、及び濾過層の濾過面積が４ｍ２以上である。従って、従来の一般的なセラミックスからなるハニカムフィルタ（全長：１５０〜５００ｍｍ、円柱状の場合の外径：１００〜２００ｍｍφ（又は、角柱状の場合の一辺：５０〜１５０ｍｍ）、濾過面積：０．５〜３．９ｍ２）に比して格段に大型であり、特に濾過面積に関しては、従来品の２〜５倍程度の広さとなっている。このため、ハニカムフィルタどうしを組み合わせてフィルタブロックを作製しなくとも十分に広い濾過面積を有するものであり、また、同等の濾過面積を有するフィルタブロックに比して軽量であることから、集塵装置の製造に際して労力の軽減とともに、メンテナンス性の向上をも図ることができる。なお、本発明にいう「濾過面積」とは、ハニカムフィルタを構成するセルの隔壁（濾過層）の総面積（ｍ２）をいう。
ここで、本発明にいう「筒端面の最大外寸」とは、筒端面の形状が円形の場合はその直径、楕円形の場合はその長径、四角形の場合は対角線の長さ、その他の形や不定形の場合は、最も離れた外縁部間の長さを意味する。また、本発明のハニカムフィルタにおける、濾過面積の上限値は特に限定されるものではないが、隔壁の厚さやセルピッチ等、実質的な製造可能性を考慮すれば、２０ｍ２以下であればよい。なお、本発明のハニカムフィルタの隔壁の厚さは０．２〜２ｍｍであり、セルピッチは２．５〜１０ｍｍであることが好ましい。
本発明においては、セラミックスが、コーディエライトであることが好ましい。コーディエライトは、熱膨張係数が小さく、耐熱衝撃性に優れたセラミックス材料である。即ち、ハニカムフィルタを構成するセラミックス材料として好適な特性を有しているために、コーディエライトからなる本発明のハニカムフィルタは、これらの特性が生かされるとともに、所望の寸法・形状となるように容易に製造されるものである。
また、本発明においては、隔壁の少なくとも一方の表面上に、一又は二層以上のフィルタ層を備えることが好ましい。フィルタ層を備えることにより、排ガスに含まれるダストの捕捉効率を上げることができるとともに、圧力損失が低減されるといった効果を奏する。なお、フィルタ層は、これが形成される基材となるハニカムフィルタと同じ材質であることが、高温条件下においても熱膨張差が発生することがなく、例えば、この材質がコーディエライトであって、約９００℃の高温条件下においても、層間の熱膨張差に起因するフィルタ層の剥離や脱落等が発生することがないといった効果を奏する。
次に、本発明の別の側面について説明する。本発明の別の側面は、前述の大型のハニカムフィルタの製造方法であり、セラミックス原料を含む原料混合物からなる成形用坏土を、重力方向に押し出して、隔壁によって仕切られた流体の流路となる複数のセルを備えたハニカム形状の成形体を形成するとともに、押出し方向に配置した網目状の底部を備えた受缶内に収納し、この成形体を受缶内に収納した状態で、複数のセルに通風することにより成形体を乾燥して乾燥体を得、この乾燥体の所定のセルの一方のセル開口部と、残余のセルの他方のセル開口部に目封じ材を圧入した後、焼成することにより、隔壁が濾過層として機能するハニカムフィルタを得ることを特徴とするものである。以下、その詳細について説明する。
原材料として、例えば、焼成するとコーディエライトとなる原料混合物（コーディエライト化原料混合物）を用意し、これに、水、及び必要に応じて有機バインダー等の各種添加物を添加して、ニーダー等を用いて混合した後、土練機等を用いて土練することにより、成形用坏土を得る。この成形用坏土を用いて、押出し成形することにより、所定の寸法のハニカム構造に成形する。押出し成形に際しては、上方から投入した坏土を下方へと押し出すことができる縦押出機を使用する。即ち、重力方向（下方）に押し出すことにより、自重によるセル曲がり等の不具合を回避することができる。
更に、一般的な押出し成形法により所定のセルピッチを有するハニカム構造体を製造することができる。押し出されたハニカム成形体を、所定形状の受缶内に押し出す。この受缶は、押し出されるハニカム成形体の寸法に合わせたものであって、その底部は、通気性を有する網目状の板（網板）となっている。なお、受缶を構成する材質は、その後の乾燥時に熱変形等し難い材質であればよい。
次いで、前述の網板を介して、成形体の下方から上方へと１００〜１５０℃の熱風をセルに通風して乾燥体を得る。乾燥に要する時間は、成形体に含有する水分、成形体の寸法、熱風の温度等により左右されるが、１〜５時間程度である。得られた乾燥体について、図１及び図２に示すように、目封じ材を用いて、多数のセル３の一方のセル開口部を上流側と下流側とを一マスごとに交互に封じる。具体的には、目封じ材を圧入することにより目封じ部１０を形成する。このとき用いる目封じ材は、基材と同じ材質のセラミックスを主成分とするものが好ましく、これにより、高温条件下での使用に際し、材質間の熱膨張差に起因する目封じ部の剥離や脱落、又は隔壁にクラック等の不具合が発生し難くなるといった効果を奏する。
目封じ後の乾燥体を、１２００〜１５００℃、最高温度で１〜４時間保持（合計の焼成時間：約３日間）して焼成することにより、本発明のハニカムフィルタを得ることができる。なお、本発明のハニカムフィルタを製造するに際しては、押出し成形から乾燥に至るまで、成形体、乾燥体等の製品を受缶内に収納したまま各々の工程を実施する。これにより、自重によるセル曲がり等の不具合を回避することができる。
上述してきた方法により製造した本発明のハニカムフィルタの平均気孔径は１０〜５０μｍ、気孔率は４０〜６０％の範囲内である。また、濾過流速が１ｍ／ｍｉｎの場合における圧力損失は１５０〜７００Ｐａである。なお、本発明にいう「平均気孔径」とは、水銀圧入法にて測定した値をいい、「気孔率」とは、ＪＩＳ Ｒ２２０５に準拠して測定した値をいう。
前述の操作手順により得られたハニカムフィルタの隔壁の表面上にフィルタ層を形成する場合には、図３に示す処理装置３０を用いればよい。この処理装置３０は、マグネットスターラー３１上にスラリータンク３２を備え、スラリータンク３２内のスラリーをエアＡの圧力によりハニカムフィルタ１に供給するものである。スラリータンク３２は、所定濃度のセラミックス粒子のスラリーを調製するためのもので、マグネットスターラー３１の攪拌作用により、均一濃度のスラリーが調製され、調製されたスラリーは、スラリー注入具３３に取付金具３４を介して接続されたハニカムフィルタ１の一端側に供給され、一方のセル開口部からその内部へ導入される。スラリーの供給量は、スラリータンク３２に設けた液面計３５により監視され、供給量が所定の値に達した時点でスラリーの供給は停止される。その後、ハニカムフィルタ１を反転させて、内部の濾過水を排出する。
導入されたスラリー中の水分は、各セルの隔壁（濾過層）を漸次透過して、外部へ流出し、この間にスラリー中の粒子が隔壁の一側面に漸次付着して、粒子からなる層を形成する。なお、スラリーの調製は、予め有機バインダーを添加し、ポリ容器内でホモミキサーにて攪拌・混合して行う。
このようにしてセラミックス粒子よりなる層を形成した後、これを乾燥し、１２００〜１５００℃にて、最高温度で１〜４時間保持（合計の焼成時間：約１日間）して焼成を行えば、フィルタ層を形成することができる。なお、二層目以降のフィルタ層の形成は、一層目のフィルタ層を焼成した後、上記と同様の方法にて行えばよい。
次に、本発明の更に別の側面について説明する。本発明の更に別の側面は、所定の外枠体の内部にハニカムフィルタが保持されてなるフィルタ保持体であり、これまで述べてきたいずれかのハニカムフィルタの外周面と、金属からなる筒状の外枠体の内周面との間に緩衝材を備え、この緩衝材が圧縮された状態で、外枠体の内部にハニカムフィルタが保持されてなるとともに、外枠体の、少なくとも一方の筒端縁又はその近傍に、外枠体の中心軸方向に延伸又は屈曲する、ハニカムフィルタの脱落防止部を備え、かつ、脱落防止部と、ハニカムフィルタの少なくとも一方の筒端面の外縁部との間に、前述の緩衝材又はそれとは別体の外縁部緩衝材を備えることを特徴とするものである。以下、その詳細について説明する。
図５（ａ）、図５（ｂ）は、本発明のフィルタ保持体の一実施形態を示す図面であり、図５（ａ）は上面図、図５（ｂ）は正面から見た断面図である。本発明のフィルタ保持体１４は、金属製である筒状の外枠体１１の内部に、同じく筒状のハニカムフィルタ１が収納される構成であり、ハニカムフィルタ１の外周面と外枠体１１の内周面との間に、所定の緩衝材１３を備えている。この緩衝材１３は、適度な弾性を有するとともに、圧縮されることによりシール性を発揮する材質からなるものであることが好ましい。具体的には、シリカ、アルミナ等からなるセラミックスファイバーブランケット等を挙げることができる。
本発明の実施形態であるフィルタ保持体は、図６（ａ）、図６（ｂ）に示すように、外枠体１１の、少なくとも一方の筒端縁又はその近傍に、外枠体１１の中心軸方向に延伸又は屈曲する、ハニカムフィルタ１の脱落防止部１８ａ，１８ｂを備えるとともに、脱落防止部１８ａ，１８ｂと、ハニカムフィルタ１の少なくとも一方の筒端面の外縁部２１との間に緩衝材１３を備えている。この緩衝材は図６（ａ）、図６（ｂ）に示すように、ハニカムフィルタ１の外周面と外枠体１１の内周面との間に配置される緩衝材１３と一体のものでもよく、この緩衝材１３とは別体の緩衝材（外縁部緩衝材）であってもよい。緩衝材１３とは別体の外縁部緩衝材を配置する場合には、これらを構成する材質として、各々の目的に合わせて最適なものを適宜選択すればよい。ハニカムフィルタ１及びこれを保持する外枠体１１が大型になると、特に高温条件下ではその保持力が弱まる場合が想定されるが、本実施形態では、ハニカムフィルタ１が大型であっても、容易に脱落することがないといった効果を奏する。また、脱落防止部１８ａ，１８ｂとハニカムフィルタ１の筒端面の外縁部２１が直接的に当接することなく、これらの間に緩衝材１３を備えているため、逆洗のための圧縮空気の導入により応力が加わった場合であっても、ハニカムフィルタ１の筒端面の外縁部２１に割れ、欠け等の不具合が生じ難いといった効果を奏する。
なお、脱落防止部１８ａ，１８ｂの形態としては、図６（ａ）に示すような、外枠体１１の筒端縁又はその近傍において、外枠体１１の中心軸方向に屈曲したものや、図６（ｂ）に示すような、外枠体１１の中心軸方向に延伸したもの等を挙げることができる。
本発明においては、図５（ａ）及び図５（ｂ）に示すように、外枠体１１の少なくとも一方の筒端縁又はその近傍の外周面上にフランジ１２を備えることが好ましく、このことにより、集塵装置等に確実且つ簡便に取り付けることができる。なお、フィルタ保持体を集塵装置等に確実に固定すべく、フランジ１２にはねじ孔１９等を設けてもよい。
外枠体１１を構成する金属としては、高温条件下での保持力確保、経済性等の観点から、ＳＵＳ４３０、ＳＳ４００等を挙げることができる。また、本発明においては、外枠体の厚さが１ｍｍ以下であることが好ましく、０．７ｍｍ以下であることが更に好ましい。これにより、作製されるフィルタ保持体が軽量化されるといった効果を奏する。外枠体の厚さが１ｍｍ超であると、形状加工が困難且つ重量が増加してしまい、集塵装置に組み込むに際しての取扱いが困難になるために好ましくない。なお、本発明においては、外枠体の厚さの下限値については特に限定されるものではないが、実質的な強度を確保する必要性を考慮すると、０．３ｍｍ以上であればよい。
本発明のフィルタ保持体を作製するに際しては、ハニカムフィルタ１の外周面に所定の緩衝材１３、又はこの緩衝材１３とは別体の外縁部緩衝材（図示せず）を仮固定し、一体型の外枠体１１の内部に圧入する方法（図７）、分割型の外枠体１１ａ，１１ｂを使用し、これらの間にハニカムフィルタ１と緩衝材１３、又は外縁部緩衝材（図示せず）とを配した後、外枠体１１ａ，１１ｂをプレスしつつこれらの当接箇所を溶接する方法（図８）等を挙げることができる。ここで、本発明においては、外枠体１１及びハニカムフィルタ１の形状が円筒状であることが好ましく、これにより、例えばこれらが角柱状である場合に比して、図７に示すように圧入により容易に作製され得るといった効果を奏する。即ち、図８に示すように、分割した外枠体によりハニカムフィルタ１と緩衝材１３挟み込んだ後、外枠体１１ａ，１１ｂの当接箇所を溶接する操作が不要となり、容易に製造され得る。なお、図７における外枠体１１のフランジ１２や、脱落防止部１８ｂは、圧入後に溶接してもよい。
次に、本発明の更に別の側面について説明する。本発明の更に別の側面は、集塵装置に配置されるハニカムフィルタのガス流路の下流側に設置され、下流側からハニカムフィルタに圧縮空気を導入することにより、ハニカムフィルタに捕捉された捕捉物を除去する逆洗装置であり、圧縮空気の流路となる円筒状の本流路管と、一方の端部が本流路管の側面部に連結するとともに、ハニカムフィルタとの接続手段を有する、一以上の筒状の支流路管と、本流路管に圧縮空気を導入するように配設された圧縮空気導入手段とを備えてなることを特徴とするものである。以下、その詳細について説明する。
図９（ａ）〜図９（ｃ）は、本発明の逆洗装置の一実施形態を示す図面であり、図９（ａ）は上面、図９（ｂ）は正面、図９（ｃ）は側面から見た断面図である。本発明の実施形態である逆洗装置４０は、圧縮空気が最初に導入される円筒状の本流路管４１、この側面部に連結する一以上の筒状の支流路管４２、及び本流路管４１に圧縮空気を導入するように配設された圧縮空気導入手段（圧縮空気導入管９と逆洗バルブ４３）を備えている。支流路管４２の、本流路管４１に連結する端部と対向する端部には所定の接続手段が設けられており、逆洗する対象物となるハニカムフィルタ１（フィルタ保持体２０）が接続され得るように構成されている。
なお、図９（ａ）〜図９（ｃ）では、逆洗装置４０及びこれに接続するフィルタ保持体２０が、集塵装置８の内部に組み込まれた状態を示している。本流路管４１に連結する圧縮空気導入手段としては、圧縮空気導入管９と、これに圧縮空気を導入する逆洗バルブ４３との組み合わせ等を挙げることができる。この逆洗バルブ４３を経由して、集塵装置８の外部から本流路管４１に圧縮空気を導入するように圧縮空気導入手段を配設して構成すればよい。例えば、図９（ａ）〜図９（ｃ）に示すように、圧縮空気導入管９と逆洗バルブ４３の各々の中心軸が略同一となるように所定間隔を隔てた状態でそれぞれを配置し、集塵装置８の使用時には圧縮空気導入管９の端部と逆洗バルブ４３の端部との間から処理済ガスを系外へと排出するとともに、逆洗時には逆洗バルブ４３から圧縮空気導入管９の方向へと圧縮空気を導入可能なように構成すればよい。
本発明の実施形態である逆洗装置４０を構成する本流路管４１の形状は円筒状である。このため、図１０に示す従来の逆洗装置４０に比して、逆洗の対象物であるハニカムフィルタ１の上方空間が狭く、圧力上昇が速いためこの空間に導入される圧縮空気が最小限に抑制される。このため、ハニカムフィルタ１が大型であっても効率的に圧縮空気を導入することができ、ハニカムフィルタ１の逆洗を効果的に実施することができる。また、逆洗装置４０自体を構成する材料、例えばＳＳ４００等の金属の使用量も最小限であり、軽量化されている。従って、大型であっても集塵装置８等への組み込みが容易であるとともに、組み込みの信頼性も高いものである。
次に、本発明の更に別の側面について説明する。本発明の更に別の側面は、主としてダスト等を含む焼却炉排ガスから、このダスト等を除去するための集塵装置であり、ガス流路と、このガス流路に、ハニカムフィルタの一方の筒端面より被処理排ガスが流入し、他方の筒端面より処理済ガスが排出するように設置された、これまでに述べてきたいずれかのフィルタ保持体と、このフィルタ保持体に保持されたハニカムフィルタの、他方の筒端面に接続され、ハニカムフィルタの逆洗を行う、前述の逆洗装置とを備えることを特徴とするものである。以下、その詳細について説明する。
図１１は、本発明の集塵装置の一実施形態を模式的に示す図面である。本発明の実施形態である集塵装置８は、バーナー１５等の加熱・焼却手段を備えた焼却炉１６等の被処理排ガスの発生源から、煙突１７等の処理済ガスの放出手段に至るガス流路を備えており、このガス流路の途上に、ハニカムフィルタの一方の筒端面より被処理排ガスが流入し、他方の筒端面より処理済ガスが排出するようにフィルタ保持体１４が設置されている。
フィルタ保持体１４に保持されたハニカムフィルタの、処理済ガスが排出される筒端面には逆洗装置４０が接続され、ハニカムフィルタの逆洗を行うよう構成されている。なお、逆洗装置４０には、圧縮空気導入管９及び逆洗バルブを介して、集塵装置８の外部に接続するコンプレッサー（図示せず）等が接続され、圧縮空気を導入するように構成されている。また、集塵装置８の下部には、逆洗により除去された捕捉物（ダスト）を集積するためのダストボックス６を設置してもよい。
焼却炉において発生した、ダスト等の微粒子を含む排ガス（被処理排ガス）は、集塵装置８の所定の箇所からその内部へと進入する。進入した被処理排ガスは、フィルタ保持体１４の内部に保持されたハニカムフィルタの一方の筒端面より進入し、その濾過層にダスト等の微粒子が捕捉される。濾過層を通過したガス（処理済ガス）は、ハニカムフィルタの他方の筒端面より排出され、集塵装置８、及び煙突１７等の放出手段から、クリーンなガスとして大気中へと放出される。
これまで述べてきたように、フィルタ保持体１４には、高温条件下や逆洗応力が負荷された場合であっても、その内部にハニカムフィルタが確実に保持されるとともに、ハニカムフィルタの筒端面の外縁部に割れ、欠け等の不具合が生じ難いものである。また、逆洗装置４０は、集塵装置８に用いられるハニカムフィルタが大型であっても、効率的に圧縮空気を導入することができるために、効果的に逆洗することが可能であり、また、軽量化もなされているために集塵装置８への組み込みの信頼性が高い。
従って、本発明の集塵装置は、高い信頼性で大型のハニカムフィルタが組み込まれているため、排ガスの処理能力が極めて高いものである。また、ハニカムフィルタの効率的な逆洗が可能であるため、長期間の継続的な使用にも好適な特性を有するものである。
（実施例）
以下、本発明を実施例により具体的に説明するが、本発明はこれら実施例に限定されるものではない。
（実施例１）
焼成するとコーディエライトとなる原料混合物（コーディエライト化原料混合物）を用意し、これに、水、及び所定の添加物を添加して、ニーダーを用いて混合した後、土練機を用いて土練することにより、成形用の坏土を得た。得られた坏土を、縦押出機を使用して所定の受缶内に円筒状のハニカム形状に押し出すことにより成形体を得た。
次いで、縦置きのまま受缶の底部の網板を介して、成形体の下方から上方へと１３０℃の熱風を３時間通風して乾燥することにより乾燥体を得た。得られた乾燥体を、コーディエライト粉砕物を主成分とする目封じ材を用いて図１及び図２に示すように目封じ部１０を形成した後、縦置きのまま１３５０〜１４５０℃、２時間焼成することにより、焼成体を得た。
この焼成体の隔壁の表面上に、図３に示す処理装置３０を用いてセラミックス粒子からなる層を形成した後、縦置きのまま１３５０〜１４５０℃、１時間焼成することにより、円筒状のハニカムフィルタを得た。
（評価）
得られたハニカムフィルタの全長は７００ｍｍ、外径（最大外寸）は２５０ｍｍφ、濾過面積は８ｍ２、平均気孔径（水銀圧入法にて測定）は１５μｍ、気孔率（ＪＩＳ Ｒ２２０５に準拠）は４０％、セルピッチは６ｍｍ、及び隔壁の厚さは１ｍｍであった。また、目視評価したところ、セルや、ハニカムフィルタの全体に、変形やつぶれ等の不具合の発生を確認することはできなかった。
産業上の利用可能性
以上説明したように、本発明のハニカムフィルタは、その一方の開口端面から他方の開口端面までの長さ、開口端面の最大外寸、及び濾過面積が所定の数値範囲である、いわゆる大型のハニカムフィルタであるため、排ガスの処理能力が大きく、主として集塵装置用のフィルタとして好適な特性を有する。
また、本発明のハニカムフィルタの製造方法によれば、成形用坏土を、重力方向に押し出してハニカム形状の成形体を形成するとともに、所定の受缶内に収納し、この受缶内に収納した状態で乾燥、及び焼成するため、大型でありながらもセルやその全体に、変形やつぶれ等の不具合を生ずることなく、ハニカムフィルタを製造することができる。
更に、本発明のフィルタ保持体は、ハニカムフィルタと外枠体との間に緩衝材を備え、緩衝材が圧縮された状態で、外枠体の内部にハニカムフィルタが保持されてなるとともに、外枠体の所定の箇所に、緩衝材を介したハニカムフィルタの脱落防止部を備えるものであるため、外枠体への保持に信頼性を有し、取扱い容易性にも優れている。
一方、本発明の逆洗装置は、円筒状の本流路管と、この本流路管の側面部に連結するとともに、ハニカムフィルタとの接続手段を有する筒状の支流路管と、本流路管に連結する圧縮空気導入手段とを備えてなるものであるため、軽量であり、かつ、支流路管に接続されたハニカムフィルタの逆洗を効率的に実施することができる。
また、本発明の集塵装置によれば、ガス流路と、このガス流路に、所定状態で設置された所定のフィルタ保持体と、このフィルタ保持体に保持されたハニカムフィルタに接続され、このハニカムフィルタの逆洗を行う所定の逆洗装置とを備えるものであるため、処理能力が極めて高く、信頼性に優れた集塵装置であるとともに、ハニカムフィルタの効率的な逆洗が可能であるため、長期間の継続的な使用にも好適な特性を有するものである。
【図面の簡単な説明】
図１は、本発明のハニカムフィルタの一実施形態を示す模式図である。
図２は、ハニカムフィルタの開口端面における目封じ状態を示す模式図である。
図３は、フィルタ層の形成方法の一例を示す模式図である。
図４は、ハニカムフィルタの一般的構成を示す斜視図である。
図５は、本発明のフィルタ保持体の一実施形態を示す図面であり、図５（ａ）は上面図、図５（ｂ）は正面から見た断面図である。
図６（ａ）、図６（ｂ）は、本発明のフィルタ保持体の脱落防止部の一例を示す部分断面図である。
図７は、フィルタ保持体の作製方法の一例を模式的に示す図面である。
図８は、フィルタ保持体の作製方法の別の例を模式的に示す図面である。
図９は、本発明の逆洗装置の一実施形態を示す図面であり、図９（ａ）は上面、図９（ｂ）は正面、図９（ｃ）は側面から見た断面図である。
図１０は、従来の逆洗装置をフィルタブロックに取り付けた状態を模式的に示す斜視図である。
図１１は、本発明の集塵装置の一実施形態を模式的に示す図面である。Technical field
The present invention relates to a honeycomb filter and a manufacturing method thereof, a filter holder using the honeycomb filter, a backwashing device, and a dust collecting device using the same, and more particularly, a filter for a dust collecting device having a particularly large processing capacity. The present invention relates to a large-sized honeycomb filter having suitable characteristics, a manufacturing method thereof, a filter holder, a backwash device, and a dust collector having a high processing capacity in combination of these.
Background art
Conventionally, the filters used in dust collectors were mainly bag filters made of paper, fiber, polymer resin, etc., but in recent years, environmental measures such as pollution prevention, product recovery from high-temperature gas, In addition, from the viewpoint of clean high-temperature energy recovery, etc., not only in the temperature range where the conventional bag filter can be used (low temperature range) but also in the temperature range where the bag filter cannot be used (250 ° C or higher) (high temperature range). The market where dust work is required is expanding.
Under such circumstances, ceramics are excellent in heat resistance and corrosion resistance, and have desirable characteristics as a filter material used not only in the conventional low temperature range but also in atmospheres exposed to high temperatures and corrosive gases. It is used as various ceramic filters. In dust collection using such a ceramic filter, dust in the gas enters from the upstream side and is trapped on the surface of the filtration surface when the gas passes through the porous partition and exits from the downstream hole. Is done.
At present, examples of the shape of the ceramic filter include a tube shape or a shape called a candle type having a closed bottomed tube shape, etc. Among them, a filter having a honeycomb structure (honeycomb filter) is a unit. Due to its wide filtration area per volume and excellent dust collection efficiency, it has characteristics suitable as a filter for dust collectors used in a wide range of fields such as chemical, electric power, steel, and industrial waste treatment. It is what you have.
As shown in FIG. 4, the honeycomb filter 1 has a structure in which the upstream side B and the downstream side C of the cell openings of a large number of cells 3 are alternately sealed for each cell, and enters from the upstream side B. The gas passes through the porous partition wall 2 and escapes from the hole on the downstream side C. At that time, dust in the gas is trapped on the surface of the partition wall 2.
In order to further increase the processing capacity of the dust collector, it is necessary to increase the filtration area of the filter. For this reason, conventionally, measures have been taken to increase the filtration area of the filter by preparing a filter block in which a plurality of honeycomb filters are combined so that these cells are parallel, and incorporating this into the apparatus as a filter. (See, for example, Japanese Patent No. 1933425).
However, in order to produce a filter block by combining a plurality of honeycomb filters, there is a problem that a plurality of steps and a great deal of labor are required. For this reason, manufacturing a large filter honeycomb having a larger filtration area that does not require a combination of a plurality of honeycomb filters, and incorporating this into a device as a filter can be cited as a measure for solving the above-mentioned problems. .
However, when trying to manufacture a larger honeycomb filter, there is a problem that the molded body before drying and firing is likely to be deformed by its own weight, without causing problems such as cell collapse and deformation, or deformation of the entire honeycomb filter. It was extremely difficult to manufacture a honeycomb filter. Therefore, it is extremely difficult to provide a desired filter having a sufficiently large filtration area without producing a filter block by combining honeycomb filters with each other. The current situation was unavoidable.
When incorporating a honeycomb filter or a filter block into a dust collector or the like, the honeycomb filter or the like is made of a metal outer frame for the convenience of assembling work and for preventing mixing of untreated gas and treated gas. In general, the filter holder is held inside and incorporated therein. However, as the honeycomb filter and the filter block increase in size, the outer frame for holding them also increases in size and increases in weight. For this reason, the case where the problem arises in the reliability of the holding | maintenance to an outer frame, the ease of handling, etc. is assumed.
Usually, a filter built in a dust collector or the like introduces compressed air in a direction opposite to the flow direction of exhaust gas, and periodically removes trapped substances (dust, etc.) trapped by the filter. I do. FIG. 10 is a perspective view schematically showing a state in which a conventional backwash device is attached to a filter block. Again, as the filter such as the filter block 7 increases in size, the backwash device 40 increases in size and its weight increases, making it difficult to incorporate it into the dust collector. Moreover, since the space for introducing compressed air into the filter block 7 in the backwashing apparatus 40 increases, there is a problem that the pressure rise is slow and it is difficult to perform effective backwashing.
The present invention has been made in view of such problems of the prior art, and the object of the present invention is to provide a honeycomb filter having a large size and a very large filtration area, and the honeycomb filter in a cell or the whole. Manufacturing method without causing problems such as deformation and crushing, filter holding body excellent in reliability and ease of handling to the outer frame body, backwashing apparatus which is lightweight and excellent in backwashing efficiency, and processing An object of the present invention is to provide a dust collector having high capability and excellent reliability.
Disclosure of the invention
That is, according to the present invention, a plurality of cells serving as fluid flow paths partitioned into a honeycomb shape by partition walls having a porous structure, one cell opening of a predetermined cell, and the remaining cell A cylindrical honeycomb filter made of ceramics in which the partition wall functions as a filtration layer by plugged portions alternately formed in the other cell opening of the first cell end surface from one tube end surface to the other tube end surface The length is 500 to 1000 mm, the maximum outer dimension of the cylinder end surface is 200 to 350 mm, and the filtration area of the filtration layer is 4 m. 2 The honeycomb filter characterized by the above is provided.
In the present invention, the ceramic is preferably cordierite, and preferably has one or more filter layers on at least one surface of the partition wall.
Further, according to the present invention, a honeycomb-shaped formed body provided with a plurality of cells serving as fluid flow paths partitioned by partition walls by extruding a forming clay made of a raw material mixture containing a ceramic raw material in the direction of gravity. And forming the molded body by ventilating the plurality of cells in a state where the molded body is housed in the receiving can. To obtain a dried body, press-fitting a sealing material into one cell opening of the predetermined cell of the dried body and the other cell opening of the remaining cell, followed by firing, There is provided a method for manufacturing a honeycomb filter, characterized in that a honeycomb filter having partition walls functioning as a filtration layer is obtained.
Further, according to the present invention, a buffer material is provided between the outer peripheral surface of any one of the honeycomb filters and the inner peripheral surface of a cylindrical outer frame made of metal, and the buffer material is in a compressed state. The honeycomb filter is held inside the outer frame body, and extends or bends in the direction of the center axis of the outer frame body at or near at least one cylinder edge of the outer frame body, A honeycomb filter drop-off prevention portion, and the buffer member or an outer edge buffer separate from the buffer member between the drop-off prevention portion and an outer edge portion of the cylindrical end surface of at least one of the honeycomb filters. A filter holder is provided that comprises a material.
In the present invention, it is preferable to provide a flange on the outer peripheral surface of at least one tube end edge of the outer frame body or in the vicinity thereof, and the thickness of the outer frame body is preferably 1 mm or less, and the outer frame body and The shape of the honeycomb filter is preferably cylindrical.
Further, according to the present invention, it is installed on the downstream side of the gas flow path of the honeycomb filter disposed in the dust collector, and is captured by the honeycomb filter by introducing compressed air into the honeycomb filter from the downstream side. A backwashing device for removing the trapped matter, a cylindrical main channel pipe serving as a compressed air channel, one end of which is connected to a side surface of the main channel pipe, and the honeycomb filter; Backwashing apparatus comprising: one or more cylindrical branch channel pipes having connection means; and compressed air introduction means arranged to introduce compressed air into the main channel pipe Is provided.
Further, according to the present invention, the exhaust gas to be treated flows into the gas flow path and the gas flow path from one of the cylinder end faces of the honeycomb filter, and the treated gas is discharged from the other cylinder end face. One of the installed filter holders, and the backwashing device connected to the other end face of the honeycomb filter held by the filter holder and performing backwashing of the honeycomb filter. A dust collector characterized by the above is provided.
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described. However, the present invention is not limited to the following embodiments, and may be appropriately selected based on ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. It should be understood that design changes, improvements, etc. may be made.
The present invention includes a plurality of cells serving as fluid flow paths partitioned into a honeycomb shape by partition walls having a porous structure, and one cell opening of a predetermined cell and the other cell opening of a remaining cell A cylindrical honeycomb filter made of ceramics with partition walls functioning as a filtration layer by alternately forming plugged portions, the length from one cylinder end surface to the other cylinder end surface being 500 to 1000 mm, The maximum outer dimension of the end face is 200 to 350 mm, and the filtration area of the filtration layer is 4 m. 2 It is the above, It is characterized by the above. The details will be described below.
FIG. 1 is a schematic view showing an embodiment of the honeycomb filter of the present invention. The honeycomb filter 1 according to the present embodiment includes a plurality of cells 3 serving as fluid flow paths, and these cells 3 are configured by being partitioned into honeycomb shapes by partition walls 2. Further, the partition wall 2 has a porous structure provided with a large number of fine holes (communication holes) having a filtering ability that communicate from one surface to the other surface.
A plugging portion 10 is formed in one cell opening of a predetermined cell. Similarly, the plugged portion 10 is formed in the other cell opening of the remaining cells other than the predetermined cells. By forming the sealing part 10 in such a state, the exhaust gas that has entered from one of the cylinder end faces 4 uses the porous partition wall 2 as a filtration layer, and dust in the exhaust gas is captured on the surface of the partition wall 2. . The clean gas from which the dust has been removed is discharged from the other cylinder end surface 5.
As shown in FIGS. 1 and 2, the honeycomb filter of the present invention has a length X (hereinafter referred to as “full length”) from one cylinder end surface 4 to the other cylinder end surface 5 of 500 to 1000 mm, a cylinder end surface. The maximum outer dimension Y (hereinafter simply referred to as “maximum outer dimension”) is 200 to 350 mmφ, and the filtration area of the filtration layer is 4 m. 2 That's it. Therefore, a conventional honeycomb filter made of general ceramics (total length: 150 to 500 mm, outer diameter in the case of a columnar shape: 100 to 200 mmφ (or one side in the case of a prismatic shape: 50 to 150 mm), filtration area: 0. 5 to 3.9m 2 ), And the filtration area is about 2-5 times that of the conventional product. For this reason, it has a sufficiently large filtration area without producing a filter block by combining honeycomb filters, and it is lighter than a filter block having an equivalent filtration area. It is possible to reduce the labor and improve the maintainability during the manufacturing process. The “filtration area” in the present invention is the total area (m of the partition walls (filter layers) of the cells constituting the honeycomb filter). 2 ).
Here, the “maximum outer dimension of the cylinder end face” as used in the present invention means the diameter when the shape of the cylinder end face is circular, the long diameter when it is elliptical, the length of the diagonal line when it is square, and other shapes. Or indefinite form means the length between the outermost edges. Further, the upper limit value of the filtration area in the honeycomb filter of the present invention is not particularly limited. However, in consideration of substantial manufacturability such as a partition wall thickness and a cell pitch, 20 m 2 The following is sufficient. In addition, it is preferable that the thickness of the partition wall of the honeycomb filter of the present invention is 0.2 to 2 mm, and the cell pitch is 2.5 to 10 mm.
In the present invention, the ceramic is preferably cordierite. Cordierite is a ceramic material having a small thermal expansion coefficient and excellent thermal shock resistance. That is, since it has characteristics suitable as a ceramic material constituting the honeycomb filter, the honeycomb filter of the present invention made of cordierite makes use of these characteristics and has a desired size and shape. It is easy to manufacture.
In the present invention, it is preferable to provide one or more filter layers on at least one surface of the partition wall. By providing the filter layer, it is possible to increase the efficiency of capturing dust contained in the exhaust gas, and to reduce the pressure loss. Note that the filter layer is made of the same material as that of the honeycomb filter serving as a base material on which the filter layer is formed, so that no difference in thermal expansion occurs even under high temperature conditions. For example, this material is cordierite. Even under a high temperature condition of about 900 ° C., there is an effect that the filter layer is not peeled off or dropped off due to the difference in thermal expansion between the layers.
Next, another aspect of the present invention will be described. Another aspect of the present invention is the above-described method for manufacturing a large honeycomb filter, in which a forming clay made of a raw material mixture containing a ceramic raw material is extruded in the direction of gravity, and a fluid flow path partitioned by partition walls. Forming a honeycomb-shaped formed body having a plurality of cells, and storing in a can having a mesh-shaped bottom portion arranged in the extrusion direction. After the molded body is dried by ventilating the cells, a dried body is obtained, and after plugging the plugging material into one cell opening of a predetermined cell of the dried body and the other cell opening of the remaining cell The honeycomb filter in which the partition walls function as a filtration layer is obtained by firing. The details will be described below.
For example, a raw material mixture (cordierite raw material mixture) that becomes cordierite when fired is prepared as a raw material, and various additives such as water and an organic binder are added to the raw material mixture. After mixing using, kneading is carried out using a kneader or the like to obtain a forming clay. By using the molding clay, extrusion molding is performed to form a honeycomb structure having a predetermined size. At the time of extrusion molding, a vertical extruder that can push out the clay charged from above is used. That is, by extruding in the direction of gravity (downward), problems such as cell bending due to its own weight can be avoided.
Furthermore, a honeycomb structure having a predetermined cell pitch can be manufactured by a general extrusion molding method. The extruded honeycomb formed body is extruded into a can having a predetermined shape. This receptacle is adapted to the dimensions of the extruded honeycomb molded body, and its bottom is a mesh-like plate (mesh plate) having air permeability. In addition, the material which comprises a receptacle can just be a material which is hard to carry out a heat deformation at the time of subsequent drying.
Next, hot air of 100 to 150 ° C. is passed through the cell from the lower side to the upper side of the molded body through the above-described mesh plate to obtain a dried body. The time required for drying depends on the moisture contained in the molded body, the dimensions of the molded body, the temperature of the hot air, etc., but is about 1 to 5 hours. About the obtained dry body, as shown in FIG.1 and FIG.2, using the plugging material, one cell opening part of many cells 3 is sealed alternately for every cell on the upstream side and downstream side. Specifically, the plugging portion 10 is formed by press-fitting a plugging material. The plugging material used at this time is preferably composed mainly of ceramics of the same material as the base material, so that when used under high-temperature conditions, the sealant part peels off due to the difference in thermal expansion between the materials. There is an effect that it becomes difficult to drop off or cause defects such as cracks in the partition walls.
The honeycomb filter of the present invention can be obtained by firing the plugged dried body at 1200 to 1500 ° C. and keeping the maximum temperature for 1 to 4 hours (total firing time: about 3 days). In manufacturing the honeycomb filter of the present invention, each process is carried out from the extrusion molding to the drying while the product such as the molded body and the dried body is stored in the receptacle. Thereby, problems such as cell bending due to its own weight can be avoided.
The average pore diameter of the honeycomb filter of the present invention produced by the method described above is 10 to 50 μm, and the porosity is in the range of 40 to 60%. The pressure loss is 150 to 700 Pa when the filtration flow rate is 1 m / min. The “average pore diameter” in the present invention refers to a value measured by a mercury intrusion method, and the “porosity” refers to a value measured in accordance with JIS R2205.
When forming a filter layer on the surface of the partition wall of the honeycomb filter obtained by the above operation procedure, the processing apparatus 30 shown in FIG. 3 may be used. The processing apparatus 30 includes a slurry tank 32 on a magnet stirrer 31 and supplies the slurry in the slurry tank 32 to the honeycomb filter 1 by the pressure of air A. The slurry tank 32 is for preparing a slurry of ceramic particles having a predetermined concentration. A slurry having a uniform concentration is prepared by the stirring action of the magnet stirrer 31, and the prepared slurry is attached to the slurry injection tool 33 to the mounting bracket 34. Is supplied to one end side of the honeycomb filter 1 connected through the first and second cell openings, and introduced into the inside thereof. The supply amount of the slurry is monitored by a liquid level gauge 35 provided in the slurry tank 32, and the supply of the slurry is stopped when the supply amount reaches a predetermined value. Thereafter, the honeycomb filter 1 is inverted and the filtered water inside is discharged.
Moisture in the introduced slurry gradually permeates through the partition walls (filter layers) of each cell and flows to the outside. During this time, particles in the slurry gradually adhere to one side surface of the partition walls, thereby forming a layer composed of particles. Form. The slurry is prepared by adding an organic binder in advance and stirring and mixing with a homomixer in a plastic container.
After forming a layer made of ceramic particles in this way, this is dried and held at 1200 to 1500 ° C. at the maximum temperature for 1 to 4 hours (total firing time: about 1 day). A filter layer can be formed. The second and subsequent filter layers may be formed by the same method as described above after firing the first filter layer.
Next, still another aspect of the present invention will be described. Yet another aspect of the present invention is a filter holder in which a honeycomb filter is held inside a predetermined outer frame, and the outer peripheral surface of any of the honeycomb filters described so far and a cylindrical shape made of metal. A cushioning material is provided between the outer frame body and the inner peripheral surface of the outer frame body, and in a compressed state, the honeycomb filter is held inside the outer frame body, and at least one of the outer frame body A honeycomb filter drop-off prevention portion that extends or bends in the direction of the central axis of the outer frame body is provided at or near the cylinder end edge, and the drop-off prevention portion and the outer edge portion of at least one tube end surface of the honeycomb filter In the meantime, the above-mentioned cushioning material or a separate outer edge cushioning material is provided. The details will be described below.
5 (a) and 5 (b) are drawings showing an embodiment of the filter holder of the present invention, FIG. 5 (a) is a top view, and FIG. 5 (b) is a sectional view as seen from the front. It is. The filter holder 14 of the present invention has a configuration in which a tubular honeycomb filter 1 is housed in a cylindrical outer frame 11 made of metal, and the outer peripheral surface of the honeycomb filter 1 and the outer frame 11. A predetermined cushioning material 13 is provided between the inner peripheral surface of the first shock absorbing member and the inner peripheral surface. The cushioning material 13 is preferably made of a material having moderate elasticity and exhibiting sealing properties when compressed. Specific examples include a ceramic fiber blanket made of silica, alumina, and the like.
As shown in FIGS. 6 (a) and 6 (b), the filter holder according to the embodiment of the present invention is provided on at least one tube end edge of the outer frame body 11 or the vicinity thereof. The honeycomb filter 1 includes drop-off prevention portions 18a and 18b that extend or bend in the central axis direction, and a cushioning material between the drop-off prevention portions 18a and 18b and the outer edge portion 21 of at least one tube end surface of the honeycomb filter 1. 13 is provided. As shown in FIGS. 6A and 6B, this cushioning material may be integral with the cushioning material 13 disposed between the outer peripheral surface of the honeycomb filter 1 and the inner peripheral surface of the outer frame body 11. In addition, the cushioning material 13 may be a separate cushioning material (outer edge cushioning material). In the case where the outer edge cushioning material separate from the cushioning material 13 is disposed, the material constituting them may be appropriately selected according to each purpose. When the honeycomb filter 1 and the outer frame 11 that holds the honeycomb filter 1 become large, it is assumed that the holding force is weakened particularly under high-temperature conditions. However, in the present embodiment, even if the honeycomb filter 1 is large, it is easy. There is an effect that it does not fall off. Further, since the drop-off preventing portions 18a and 18b and the outer edge portion 21 of the cylindrical end surface of the honeycomb filter 1 are not in direct contact with each other, and the buffer material 13 is provided between them, introduction of compressed air for backwashing is introduced. Even when stress is applied by the above, there is an effect that the outer edge portion 21 of the cylindrical end face of the honeycomb filter 1 is less likely to be broken or chipped.
In addition, as a form of drop-off prevention parts 18a, 18b, as shown in FIG. 6A, at the tube end edge of the outer frame body 11 or in the vicinity thereof, bent in the central axis direction of the outer frame body 11, As shown in FIG. 6B, the outer frame 11 may be extended in the central axis direction.
In the present invention, as shown in FIGS. 5 (a) and 5 (b), it is preferable to provide a flange 12 on at least one cylindrical end edge of the outer frame body 11 or on the outer peripheral surface in the vicinity thereof. Thus, it can be reliably and easily attached to a dust collector or the like. In order to securely fix the filter holder to a dust collector or the like, the flange 12 may be provided with a screw hole 19 or the like.
Examples of the metal constituting the outer frame body 11 include SUS430, SS400, and the like from the viewpoints of securing holding power under high temperature conditions, economy, and the like. Moreover, in this invention, it is preferable that the thickness of an outer frame is 1 mm or less, and it is still more preferable that it is 0.7 mm or less. Thereby, there exists an effect that the filter holder produced is weight-reduced. If the thickness of the outer frame is more than 1 mm, shape processing is difficult and the weight is increased, which is not preferable because it becomes difficult to handle when incorporated in a dust collector. In the present invention, the lower limit value of the thickness of the outer frame body is not particularly limited, but it may be 0.3 mm or more in consideration of the necessity of securing a substantial strength.
When producing the filter holder of the present invention, a predetermined buffer material 13 or an outer edge buffer material (not shown) separate from the buffer material 13 is temporarily fixed on the outer peripheral surface of the honeycomb filter 1. A method of press-fitting the body-shaped outer frame body 11 (FIG. 7), split-type outer frame bodies 11a and 11b are used, and the honeycomb filter 1 and the buffer material 13 or the outer edge buffer material (not shown) are interposed between them. And the like (FIG. 8) and the like can be mentioned. Here, in the present invention, it is preferable that the shape of the outer frame body 11 and the honeycomb filter 1 is a cylindrical shape, so that, for example, as shown in FIG. The effect that it can be produced easily is produced. That is, as shown in FIG. 8, after the honeycomb filter 1 and the buffer material 13 are sandwiched between the divided outer frame bodies, an operation of welding the contact portions of the outer frame bodies 11a and 11b is not necessary, and can be easily manufactured. In addition, you may weld the flange 12 of the outer frame body 11 in FIG. 7, and the drop-off prevention part 18b after press-fitting.
Next, still another aspect of the present invention will be described. Still another aspect of the present invention is a trap that is installed on the downstream side of the gas flow path of the honeycomb filter disposed in the dust collector, and trapped in the honeycomb filter by introducing compressed air from the downstream side to the honeycomb filter. This is a backwashing device that removes matter, and has a cylindrical main flow channel pipe serving as a compressed air flow channel, one end of which is connected to a side surface of the main flow channel tube, and a connecting means with a honeycomb filter. It is characterized by comprising at least one cylindrical branch channel pipe and compressed air introducing means arranged to introduce compressed air into the main channel pipe. The details will be described below.
9 (a) to 9 (c) are drawings showing an embodiment of the backwashing device of the present invention. FIG. 9 (a) is a top view, FIG. 9 (b) is a front view, and FIG. 9 (c). FIG. 3 is a cross-sectional view seen from the side. A backwash device 40 according to an embodiment of the present invention includes a cylindrical main channel pipe 41 into which compressed air is first introduced, one or more cylindrical branch channel pipes 42 connected to the side surface portion, and a main channel pipe. 41 is provided with compressed air introduction means (a compressed air introduction pipe 9 and a backwash valve 43) arranged to introduce compressed air. A predetermined connection means is provided at the end of the branch channel 42 opposite to the end connected to the main channel 41, and the honeycomb filter 1 (filter holding body 20) to be backwashed is connected thereto. It is configured to be able to.
9A to 9C show a state in which the backwashing device 40 and the filter holder 20 connected thereto are incorporated in the dust collecting device 8. Examples of the compressed air introducing means connected to the main channel pipe 41 include a combination of the compressed air introducing pipe 9 and a backwash valve 43 for introducing compressed air into the compressed air introducing pipe 9. What is necessary is just to arrange | position and comprise a compressed air introduction means so that compressed air may be introduce | transduced into the main channel pipe 41 from the exterior of the dust collector 8 via this backwash valve 43. For example, as shown in FIGS. 9 (a) to 9 (c), the compressed air introduction pipe 9 and the backwash valve 43 are arranged at predetermined intervals so that the central axes thereof are substantially the same. When the dust collector 8 is used, the treated gas is discharged out of the system between the end of the compressed air introduction pipe 9 and the end of the backwash valve 43, and compressed from the backwash valve 43 during backwashing. What is necessary is just to comprise so that compressed air can be introduced in the direction of the air introduction pipe | tube 9. As shown in FIG.
The shape of the main channel pipe 41 constituting the backwash device 40 according to the embodiment of the present invention is cylindrical. For this reason, compared with the conventional backwashing apparatus 40 shown in FIG. 10, since the space above the honeycomb filter 1 which is the object of backwashing is narrow and the pressure rises quickly, the compressed air introduced into this space is minimized. To be suppressed. For this reason, even if the honeycomb filter 1 is large, compressed air can be efficiently introduced, and the honeycomb filter 1 can be backwashed effectively. Further, the amount of the material constituting the backwash device 40 itself, for example, a metal such as SS400, is also minimal, and the weight is reduced. Therefore, even if it is large, it can be easily incorporated into the dust collector 8 and the like, and the reliability of incorporation is high.
Next, still another aspect of the present invention will be described. Still another aspect of the present invention is a dust collector for removing dust and the like from incinerator exhaust gas mainly containing dust and the like, and a gas passage and one tube of a honeycomb filter in the gas passage. One of the filter holders described so far, in which the exhaust gas to be treated flows from the end face and the treated gas is discharged from the other cylinder end face, and the honeycomb filter held by the filter holder The above-mentioned backwashing apparatus is provided, which is connected to the other end face of the cylinder and backwashes the honeycomb filter. The details will be described below.
FIG. 11 is a drawing schematically showing an embodiment of the dust collector of the present invention. A dust collector 8 according to an embodiment of the present invention is a gas that reaches a treated gas discharge means such as a chimney 17 from a source of treated exhaust gas such as an incinerator 16 equipped with a heating / incineration means such as a burner 15. A filter holder 14 is installed in the middle of the gas flow path so that the exhaust gas to be treated flows from one end face of the honeycomb filter and the treated gas is discharged from the other end face of the honeycomb filter. ing.
A backwashing device 40 is connected to the end face of the honeycomb filter held by the filter holder 14 from which the treated gas is discharged, so that the honeycomb filter is backwashed. The backwashing device 40 is connected to a compressor (not shown) connected to the outside of the dust collecting device 8 via the compressed air introduction tube 9 and the backwashing valve so as to introduce the compressed air. Has been. In addition, a dust box 6 for accumulating captured matter (dust) removed by backwashing may be installed below the dust collector 8.
Exhaust gas containing particulates such as dust (treated exhaust gas) generated in the incinerator enters the inside of the dust collector 8 from a predetermined location. The treated exhaust gas that has entered enters from one end face of the honeycomb filter held inside the filter holder 14, and particulates such as dust are captured by the filtration layer. The gas that has passed through the filtration layer (treated gas) is discharged from the other cylinder end surface of the honeycomb filter, and discharged from the dust collector 8 and the discharge means such as the chimney 17 into the atmosphere as clean gas.
As described so far, even when the filter holder 14 is subjected to high temperature conditions or backwashing stress, the honeycomb filter is securely held therein, and the cylindrical end surface of the honeycomb filter It is difficult for defects such as cracks and chippings to occur in the outer edge portion. Moreover, since the backwashing apparatus 40 can introduce compressed air efficiently even if the honeycomb filter used for the dust collector 8 is large, it can be backwashed effectively. Moreover, since the weight is reduced, the reliability of incorporation into the dust collector 8 is high.
Therefore, since the dust collector of the present invention incorporates a large honeycomb filter with high reliability, the exhaust gas treatment capacity is extremely high. Moreover, since the honeycomb filter can be efficiently backwashed, it has characteristics suitable for long-term continuous use.
(Example)
EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.
(Example 1)
Prepare a raw material mixture (cordierite raw material mixture) that becomes cordierite when baked, add water and predetermined additives to this, mix using a kneader, and then use a kneader By kneading, a clay for molding was obtained. The obtained kneaded material was extruded into a cylindrical honeycomb shape in a predetermined can using a vertical extruder to obtain a molded body.
Subsequently, a dry body was obtained by passing hot air of 130 ° C. for 3 hours from below to the upper side of the molded body through the mesh plate at the bottom of the can while being placed vertically. After forming the sealed part 10 as shown in FIG.1 and FIG.2 using the sealing material which has a cordierite pulverized material as a main component, the obtained dried body is 1350-1450 degreeC with being placed vertically, A fired body was obtained by firing for 2 hours.
A layer composed of ceramic particles is formed on the surface of the partition walls of the fired body using the processing device 30 shown in FIG. 3, and then fired at 1350 to 1450 ° C. for 1 hour while being placed in a vertical position, thereby forming a cylindrical honeycomb. A filter was obtained.
(Evaluation)
The total length of the obtained honeycomb filter is 700 mm, the outer diameter (maximum outer dimension) is 250 mmφ, and the filtration area is 8 m. 2 The average pore diameter (measured by the mercury intrusion method) was 15 μm, the porosity (based on JIS R2205) was 40%, the cell pitch was 6 mm, and the partition wall thickness was 1 mm. Moreover, as a result of visual evaluation, it was not possible to confirm the occurrence of defects such as deformation and crushing in the entire cell and honeycomb filter.
Industrial applicability
As described above, the honeycomb filter of the present invention is a so-called large honeycomb filter in which the length from one opening end surface to the other opening end surface, the maximum outer dimension of the opening end surface, and the filtration area are within a predetermined numerical range. Since it is a filter, it has a large exhaust gas treatment capacity and has characteristics suitable mainly as a filter for a dust collector.
Further, according to the method for manufacturing a honeycomb filter of the present invention, the forming clay is extruded in the direction of gravity to form a honeycomb-shaped formed body, and is stored in a predetermined receptacle, and is stored in the receptacle. Since it is dried and fired in such a state, the honeycomb filter can be manufactured without causing defects such as deformation and crushing in the cell and the entire cell even though it is large.
Furthermore, the filter holding body of the present invention includes a buffer material between the honeycomb filter and the outer frame body, and the honeycomb filter is held inside the outer frame body in a state where the buffer material is compressed. Since the honeycomb filter is prevented from falling off at a predetermined position of the frame body through the cushioning material, the frame body is reliable in holding to the outer frame body and is easy to handle.
On the other hand, the backwashing device of the present invention includes a cylindrical main channel pipe, a cylindrical branch channel pipe connected to a side surface portion of the main channel pipe, and having a connecting means with a honeycomb filter, and a main channel pipe. Since it is provided with the compressed air introducing means to be connected, it is lightweight and the honeycomb filter connected to the branch passage pipe can be backwashed efficiently.
Further, according to the dust collecting apparatus of the present invention, connected to the gas flow path, the predetermined filter holder installed in the gas flow path in a predetermined state, and the honeycomb filter held in the filter holder, Since this honeycomb filter is equipped with a predetermined backwashing device for backwashing, it is a dust collector with extremely high processing capacity and excellent reliability, and it is possible to efficiently backwash the honeycomb filter. Therefore, it has characteristics suitable for long-term continuous use.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of the honeycomb filter of the present invention.
FIG. 2 is a schematic view showing a plugged state on the opening end face of the honeycomb filter.
FIG. 3 is a schematic diagram illustrating an example of a method for forming a filter layer.
FIG. 4 is a perspective view showing a general configuration of the honeycomb filter.
FIG. 5 is a view showing an embodiment of the filter holder of the present invention, FIG. 5 (a) is a top view, and FIG. 5 (b) is a sectional view as seen from the front.
6 (a) and 6 (b) are partial cross-sectional views showing an example of the drop-off preventing portion of the filter holder of the present invention.
FIG. 7 is a drawing schematically showing an example of a method for producing a filter holder.
FIG. 8 is a drawing schematically showing another example of a method for producing a filter holder.
FIG. 9 is a view showing an embodiment of the backwashing device according to the present invention. FIG. 9A is a top view, FIG. 9B is a front view, and FIG. .
FIG. 10 is a perspective view schematically showing a state in which a conventional backwash device is attached to a filter block.
FIG. 11 is a drawing schematically showing an embodiment of the dust collector of the present invention.

Claims (10)

多孔質構造を有する隔壁によってハニカム形状に仕切られた、流体の流路となる複数のセルを備え、所定の前記セルの一方のセル開口部と、残余の前記セルの他方のセル開口部に交互に形成された目封じ部により、前記隔壁が濾過層として機能する、セラミックスからなる筒状のハニカムフィルタであって、
その一方の筒端面から他方の筒端面までの長さが５００〜１０００ｍｍ、前記筒端面の最大外寸が２００〜３５０ｍｍ、及び前記濾過層の濾過面積が４ｍ２以上であることを特徴とするハニカムフィルタ。Provided with a plurality of cells serving as fluid flow paths partitioned into a honeycomb shape by partition walls having a porous structure, and alternating between one cell opening of a predetermined cell and the other cell opening of the remaining cell A cylindrical honeycomb filter made of ceramics, wherein the partition wall functions as a filtration layer by a sealing portion formed in
A honeycomb having a length from one cylinder end face to the other cylinder end face of 500 to 1000 mm, a maximum outer dimension of the cylinder end face of 200 to 350 mm, and a filtration area of the filtration layer of 4 m 2 or more. filter. 前記セラミックスが、コーディエライトである請求項１に記載のハニカムフィルタ。The honeycomb filter according to claim 1, wherein the ceramic is cordierite. 前記隔壁の少なくとも一方の表面上に、一又は二層以上のフィルタ層を備える請求項１又は２に記載のハニカムフィルタ。The honeycomb filter according to claim 1 or 2, further comprising one or more filter layers on at least one surface of the partition wall. セラミックス原料を含む原料混合物からなる成形用坏土を、重力方向に押し出して、隔壁によって仕切られた流体の流路となる複数のセルを備えたハニカム形状の成形体を形成するとともに、押出し方向に配置した網目状の底部を備えた受缶内に収納し、
前記成形体を前記受缶内に収納した状態で、複数の前記セルに通風することにより前記成形体を乾燥して乾燥体を得、
前記乾燥体の所定の前記セルの一方のセル開口部と、残余の前記セルの他方のセル開口部に目封じ材を圧入した後、焼成することにより、前記隔壁が濾過層として機能するハニカムフィルタを得ることを特徴とするハニカムフィルタの製造方法。A forming clay made of a raw material mixture containing a ceramic raw material is extruded in the direction of gravity to form a honeycomb-shaped formed body having a plurality of cells serving as fluid flow paths partitioned by partition walls, and in the direction of extrusion. Store in a can with a mesh-shaped bottom,
In a state where the molded body is housed in the receptacle, the molded body is dried by ventilating the plurality of cells to obtain a dried body,
A honeycomb filter in which the partition wall functions as a filter layer by press-fitting a plugging material into one cell opening of the predetermined cell of the dry body and the other cell opening of the remaining cell, and then firing. A method for manufacturing a honeycomb filter, comprising: obtaining a honeycomb filter. 請求項１〜３のいずれか一項に記載のハニカムフィルタの外周面と、金属からなる筒状の外枠体の内周面との間に緩衝材を備え、前記緩衝材が圧縮された状態で、前記外枠体の内部に前記ハニカムフィルタが保持されてなるとともに、
前記外枠体の、少なくとも一方の筒端縁又はその近傍に、前記外枠体の中心軸方向に延伸又は屈曲する、前記ハニカムフィルタの脱落防止部を備え、かつ、前記脱落防止部と、前記ハニカムフィルタの少なくとも一方の前記筒端面の外縁部との間に、前記緩衝材又は前記緩衝材とは別体の外縁部緩衝材を備えることを特徴とするフィルタ保持体。A state in which a buffer material is provided between the outer peripheral surface of the honeycomb filter according to any one of claims 1 to 3 and an inner peripheral surface of a cylindrical outer frame made of metal, and the buffer material is compressed. And the honeycomb filter is held inside the outer frame body,
At least one cylinder edge of the outer frame body or in the vicinity thereof, the honeycomb filter is provided with a dropping prevention part extending or bending in the central axis direction of the outer frame body, and the dropping prevention part, A filter holder comprising an outer edge buffer material separate from the buffer material or the buffer material between at least one outer edge portion of the cylinder end surface of the honeycomb filter. 前記外枠体の、少なくとも一方の筒端縁又はその近傍の外周面上にフランジを備える請求項５に記載のフィルタ保持体。The filter holder according to claim 5, wherein a flange is provided on an outer peripheral surface of at least one tube end edge of the outer frame body or in the vicinity thereof. 前記外枠体の厚さが、１ｍｍ以下である請求項５又は６に記載のフィルタ保持体。The filter holder according to claim 5 or 6, wherein the outer frame has a thickness of 1 mm or less. 前記外枠体及び前記ハニカムフィルタの形状が、円筒状である請求項５〜７のいずれか一項に記載のフィルタ保持体。The filter holder according to any one of claims 5 to 7, wherein the outer frame body and the honeycomb filter have a cylindrical shape. 集塵装置に配置されるハニカムフィルタのガス流路の下流側に設置され、前記下流側から前記ハニカムフィルタに圧縮空気を導入することにより、前記ハニカムフィルタに捕捉された捕捉物を除去する逆洗装置であって、
前記圧縮空気の流路となる円筒状の本流路管と、一方の端部が前記本流路管の側面部に連結するとともに、前記ハニカムフィルタとの接続手段を有する、一以上の筒状の支流路管と、前記本流路管に圧縮空気を導入するように配設された圧縮空気導入手段とを備えてなることを特徴とする逆洗装置。Backwashing is installed on the downstream side of the gas flow path of the honeycomb filter disposed in the dust collector, and the trapped matter trapped in the honeycomb filter is removed by introducing compressed air into the honeycomb filter from the downstream side. A device,
One or more cylindrical tributaries having a cylindrical main flow path pipe serving as a flow path for the compressed air and one end connected to a side surface portion of the main flow path pipe and connecting means to the honeycomb filter A backwashing device comprising a channel pipe and compressed air introducing means arranged to introduce compressed air into the main channel pipe. ガス流路と、前記ガス流路に、前記ハニカムフィルタの一方の前記筒端面より被処理排ガスが流入し、他方の前記筒端面より処理済ガスが排出するように設置された請求項５〜８のいずれか一項に記載のフィルタ保持体と、前記フィルタ保持体に保持された前記ハニカムフィルタの、他方の前記筒端面に接続され、前記ハニカムフィルタの逆洗を行う請求項９に記載の逆洗装置とを備えることを特徴とする集塵装置。The gas flow path and the gas flow path are disposed so that the exhaust gas to be treated flows from one of the cylinder end faces of the honeycomb filter and the treated gas is discharged from the other cylinder end face of the honeycomb filter. The filter holder according to any one of claims 1 to 9, and the honeycomb filter held by the filter holder, connected to the other end face of the tube, and backwashing the honeycomb filter. A dust collecting device comprising a washing device.
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