JP4178388B2 - Bag filter filter cloth collecting method and apparatus - Google Patents

Bag filter filter cloth collecting method and apparatus Download PDF

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Publication number
JP4178388B2
JP4178388B2 JP2002379920A JP2002379920A JP4178388B2 JP 4178388 B2 JP4178388 B2 JP 4178388B2 JP 2002379920 A JP2002379920 A JP 2002379920A JP 2002379920 A JP2002379920 A JP 2002379920A JP 4178388 B2 JP4178388 B2 JP 4178388B2
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dust
filter
bag filter
filter cloth
bag
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JP2004209336A (en
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進一 川畑
貢 平野
貞夫 榊原
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Hitachi Plant Technologies Ltd
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Hitachi Plant Technologies Ltd
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Description

【0001】
【発明の属する技術分野】
本発明はバグフィルタのろ布回収方法に係り、特にバグフィルタ内負圧下において回収作業対象となるろ布の排出側から、バグフィルタ部の通気を保持しつつバグフィルタを構成するろ布を回収することを特徴とするバグフィルタろ布回収方法および装置に関する。
【0002】
【従来の技術】
大気汚染防止のためごみ焼却所などから排出される排気ガスをクリーンガスに再生する集塵機が一般に広く使われている。図4は排気ガス中に含まれるダストの集塵過程の概略を示す図である。図示のように焼却炉等から発生する排気ガス1は押込みファン2を通じて集塵機3内部の含塵ガス室4に送り込まれる。含塵ガス室4には集塵機3の長手方向に伸びる長筒形状のバグフィルタ5が多数組み込まれて設置されている。図5はバグフィルタの取付け状態を示す断面図である。排気ガスの流通下においてバグフィルタ5の形状を保持するためのケージ6とその表面を覆うろ布7で形成されているバグフィルタ5は長筒形状で、上端部はフランジ状であるとともに下端を閉塞している。このバグフィルタ5は含塵ガス室4と無塵ガス室8との境界面であるセルプレート9に設けられた取付開口部にはめ込まれている。供給された含塵ガス室4内の排気ガス1はバグフィルタ5内を通過して無塵ガス室8へと移動する。排気ガス1がバグフィルタ5内を通り抜ける際にはバグフィルタ5表面にフィルタの役目を果たすろ布7が設けられていて、排気ガス1中のダストは通過できずにろ布7表面に付着して捕集される。バグフィルタ5を通過してダストが取り除かれ清浄したガスは無塵ガス室8から外気へ無塵ガスとして放出される仕組みとなっている。集塵過程において排気ガス中に含まれるダストがろ布7表面に堆積するため、定期的にバグフィルタの取付開口部の排出側からエア噴射によるろ布7の洗浄作業を行っている。このろ布7は長時間使用すると劣化および目詰まり等の理由で集塵効率が悪くなるため、定期的に交換する作業が必要となってくる。しかしフィルタ表面に付着したダスト中にはダイオキシン等が含まれている危険があるため特に注意を要する。
【0003】
従来のバグフィルタのろ布交換作業は、ダストの付着したろ布に直接接触しなければならず、ときにはダストの堆積した集塵室内への進入が必要となる場合もある。作業員は防塵服、エアラインマスク等を着用し、ダストとの接触を完全に避けるよう対策している。しかしながら作業者は防塵服を着用しているものの、機器への引っかかりや転倒などの理由で防塵服が損傷した場合、作業者はダストにさらされる危険が高く、ダイオキシン類にばく露する可能性がある。一方、特許文献1におけるバグフィルタ交換作業では、交換作業中集塵室内を吸引し、取外したバグフィルタを集塵機下部に落下させて交換する構成としているが、落下口が開口しているため吸引効率が悪いこと、および交換作業中に取外したフィルタから発生するダストの外気への飛散防止が不十分である。
【0004】
【特許文献1】
特開平6−335612号公報
【0005】
【発明が解決しようとする課題】
バグフィルタ回収作業において、作業者のダイオキシン類にばく露するリスクを下げるには、作業者がダストに接触する機会を減らすことが最重要課題である。従来の方法では、作業中に発生するバグフィルタ内部から外部へダストの飛散防止対策が不十分であり、集塵機内部が密閉系でないため吸引効率が効果的でない。また防塵服等で作業者は保護されているが、作業は直接汚染されたろ布を触らなければならない場合がある。本発明の目的は、前記従来技術の欠点を解消し、バグフィルタのろ布回収作業において集塵機内の吸引効率を高め、作業員が含塵ガス室に入らなくてもろ布を回収でき、作業員のダイオキシン類へのばく露を軽減し、回収作業を容易にしたバグフィルタろ布回収方法を提供するものである。
【0006】
【課題を解決するための手段】
上記目的を達成するために本発明に係わるバグフィルタろ布回収方法は、集塵機内のバグフィルタろ布回収方法において、回収作業対象外のバグフィルタの取付開口部を閉塞し、回収作業対象となるバグフィルタの取付開口部をダスト飛散防止カバーで覆い、集塵室内を負圧に保ち、前記ダスト飛散防止カバーを取付けた回収作業対象となるバグフィルタ部の通気を保持しつつ、該バグフィルタを構成するろ布を回収することを特徴としている。また、回収作業対象となるバグフィルタの取付開口部において、ろ布を前記開口部の排出側から回収することを特徴としている。さらに、集塵機内のバグフィルタろ布回収装置であって、集塵室内を負圧に保つ吸引ファンと、バグフィルタの取付開口部を閉塞可能な蓋と、バグフィルタの取付開口部の排出側からろ布を回収する回収装置と、回収するろ布からのダスト飛散を防止するダスト飛散防止カバーとを備えた構成としている。
【0007】
【作用】
このように回収作業対象外のバグフィルタの取付開口部は閉塞しているので空気の流入口面積が小さくでき、バグフィルタ内への吸引速度を高めた状態でバグフィルタ内を負圧に保つことができる。また、作業者は含塵ガス室に入ることなくバグフィルタの取付開口部の排出側から空気を流入させながらろ布回収作業を行うことができるので、ダストに接触する機会を効率的に防止することができる。
【0008】
【発明の実施の形態】
本発明に係わるバグフィルタろ布回収方法および装置の実施の形態について添付図面に従い詳細に説明する。
図1は本発明に係わるバグフィルタろ布回収方法を示す概略図である。バグフィルタろ布回収装置10は排気ガスを供給する供給ダクト12と集塵室14と無塵ガスが排出される排出ダクト16とで構成されている。排気ガスの供給側には排気ガスを送り込む押込みファン2が集塵室14に供給ダクト12を通じて設置されている。この押込みファン2と集塵室14との間にはフィルタ付ファン18と逆流防止弁20が設置されている。フィルタ付ファン18はろ布回収作業時において集塵室14内を吸引し内部を負圧に保つ構成としている。なおフィルタ付ファン18にはダストを取り除くフィルタが設置されているため回収作業中に発生する含塵ガス室内のダストを集塵できる。フィルタ付ファン18と押込みファン2との間に設置された逆流防止弁20は、回収作業中における押込みファン2側からの排気ガスの逆流を防止している。一方、集塵室14は排気ガスが流れ込む含塵ガス室4と無塵ガス室8とで構成されている。この含塵ガス室4内部には含塵ガス室4と無塵ガス室8との境界面を形成するセルプレート9に設けられた取付開口部21に長筒形状のバグフィルタ5が複数垂下して設置されている。バグフィルタ5の表面はろ布7で覆われている。このろ布7は排ガス中のダストをろ過する役割を担っている。無塵ガス室8内には回収作業対象外のバグフィルタ5の取付開口部21を覆うリテーナ蓋22と、回収作業を行うバグフィルタ5の取付開口部21を覆うダスト飛散防止カバー24と、無塵ガスが排出される排出ダクト16とが設置されている。ダスト飛散防止カバー24はバグフィルタ5の取付開口部21から回収するろ布断面を覆うボックス形状で、底面からろ布7を回収するため底抜け構造となっている。このダスト飛散防止カバー24内部にはろ布巻き取り装置26を配備し、ろ布巻き取り装置26の軸は回転モータ28に接続しており底面から回収するろ布7を自動で巻き取る仕組みになっている。リテーナ蓋22は回収作業対象外のろ布断面を覆うバグフィルタ内を密閉する板状の蓋であり、通気性のない蓋であればその形状は特に限定しない。ろ布回収作業中の吸引時リテーナ蓋22で回収作業対象外のバグフィルタ5の取付開口部21を閉塞することにより、排気側からの通気を防いでバグフィルタ内の吸引効率を高めている。これによりバグフィルタ5の取付開口部21の通気口面積を最小限に押えることができ、バグフィルタ内への流入速度が上がり吸引ファンの吸引能力を小さく設定できる。
【0009】
以下バグフィルタろ布回収方法の作業手順について説明する。排気ガスの集塵作業終了後、排気ガスを集塵室14内に供給する押込みファン2を停止させ、作業者は供給ダクト12の上流側にある集塵室14と押込みファン2との間に設置した逆流防止弁20を閉じて、押込みファン2側から集塵室14内の排気ガスの流れ込みを防止する。つぎに集塵室14上部の無塵ガス室8から入り、回収作業対象外のバグフィルタ5の取付開口部21をリテーナ蓋22で閉塞する。つづいて逆流防止弁20と集塵室14との間の供給ダクト12に設置したフィルタ付ファン18を作動させバグフィルタ内部を吸引する。このとき集塵室14内は密閉系となっているが、回収作業対象となるろ布上部のみ開口しているのでここから流入した空気はフィルタ付ファン18に向かって吸引される。そこで作業者はバグフィルタ内部に組み込まれているケージ6の抜き取り作業を行う。抜き取り作業終了後、バグフィルタ5の取付開口部21をダスト飛散防止カバー24で覆う、このときカバー天井面は開口しているため通気する構造となっている。ろ布開口断面部のフランジ部分をダスト飛散防止カバー24に内設されたろ布巻き取り装置26のローラ部に締結する。このときこれまでの一連の作業は回収作業対象となるバグフィルタ5の取付開口部21からフィルタ内部に向かって空気が流れ込む状態なのでダストが無塵ガス室8内部に飛散することを防止できる。このバグフィルタ負圧下で作業者はろ布7の巻き取りを自動で行う。回収したろ布7はダスト飛散防止カバー24内に収容され、密閉した状態で外部へと持ち運ぶことができる。最後に取外したケージ6を内装した新しいろ布7を回収作業対象のバグフィルタ5の取付開口部21に挿入してろ布回収作業が完了する。
【0010】
なお本発明の実施形態ではフィルタ付吸引ファン18を集塵室14と逆流防止弁20の間の供給ダクト12に設置したが、含塵ガス室4を吸引する目的であれば設定はどこでもよく、たとえば供給ダクト12とは別に直接含塵ガス室4に接続する構成としてもよい。また、本発明の実施形態ではフィルタ付ファン18を用いて吸引しているが、フィルタは集塵室14と吸引ファンの間であればどこでもよく、例えば集塵室14に接続している供給ダクト12の接続口としてもよい。また、本発明の実施形態ではろ布7の回収をろ布自動巻き取り装置26を用いて説明したが、ダスト飛散防止カバー24内に収容でき容易に持ち運びができ、外部にダストが飛散しない構造であれば、これに限らず例えば折畳式の回収装置を用いてもよい。
【0011】
交換作業時において、ろ布開口部から噴出するダストを防ぐためにバグフィルタ内を負圧にする条件について、ダスト飛散源を模擬したダスト飛散防止吸引実験を図2に示す。図2に示すようにろ布取付け穴30付近でダスト32が発生することを模擬して、ダスト噴出しノズル34からダスト32を上方に噴出させる速度を噴出し風速V1とする。一方、吸引ファンでの下方方向への吸引風速をV2とした場合、ダスト噴出し風速V1に対する吸引風速V2の影響を調べる。噴出し口からダスト32が吹き上げられることを想定して、飛散源から30cmの上方位置及び飛散源から10cm横の位置においてダストカウンタでダスト個数を測定した。
【0012】
図3は図2で示したダスト飛散防止吸引の実験結果を示す図である。横軸にV1/V2、縦軸にダスト雰囲気濃度(mg/m)を示す。ダスト噴出前における測定位置の初期値を測定するとダスト雰囲気濃度0.25mg/mであるため、この測定値以下であればダストは飛散していないと判断した。その結果、測定グラフによるとV1V2=0.45以上でダストは周囲に飛散していない。すなわち、ダストの飛散風速に対してフィルタ内の吸引風速を2倍以上にできればダストは飛散せずにろ布の回収作業が行える。
【0013】
実際のろ布回収作業を模擬して、ろ布をバグフィルタ排出側に抜き取る作業において、バグフィルタ排出側に閉塞蓋を設置しない場合と吸引ファンでバグフィルタ内を吸引して、抜き取り作業対象外のバグフィルタを蓋で閉塞した場合とのダスト飛散濃度を測定した結果を表1に示す。
【表1】

Figure 0004178388
測定位置▲1▼−ろ布抜き取り位置から50cm、高さ50cmの位置
測定位置▲2▼−ろ布抜き取り位置から200cm、高さ50cmの位置
【0014】
ダスト飛散濃度の測定は作業環境測定基準に準拠して行った。このとき飛散対策なしのダスト飛散濃度を1として比較した。この結果、飛散対策なしで行った場合に比べ、抜き取り作業穴以外を蓋で閉塞しバグフィル夕内を負圧にした状態では、ダスト飛散濃度は検出限界値以下に抑える事ができる。
【0015】
【発明の効果】
以上説明したように本発明によれば、集塵機内のバグフィルタろ布回収方法において、回収作業対象外のバグフィルタの取付開口部を閉塞し、回収作業対象となるバグフィルタの取付開口部をダスト飛散防止カバーで覆い、集塵室内を負圧に保ち、前記ダスト飛散防止カバーを取付けた回収作業対象となるバグフィルタ部の通気を保持しつつ、該バグフィルタを構成するろ布を回収することを特徴とする構成とした。これにより、回収作業対象外のバグフィルタの取付開口部を閉塞しているため集塵機内の吸引効率を高めることができる。また、回収作業対象となるろ布の排出側から通気を保持しつつろ布回収作業を行うためバグフィルタ外へのダスト飛散を防止できる。さらに、バグフィルタの取付開口部の排気側からろ布を回収するため、作業員が含塵ガス室に入ることなくろ布の回収作業を行うことができ、ダストのばく露を防止することが出来る。
【図面の簡単な説明】
【図1】本発明に係るろ布回収装置の概略を示す図である。
【図2】ダスト飛散源を模擬したダスト飛散防止吸引実験を示す図である。
【図3】ダスト飛散防止吸引実験の結果を示す図である。
【図4】排気ガス中に含まれるダストの集塵過程の概略を示す図である。
【図5】バグフィルタの取付け状態を示す断面図である。
【符号の説明】
1………排気ガス、2………押込みファン、3………集塵機、4………含塵ガス室、5………バグフィルタ、6………ケージ、7………ろ布、8………無塵ガス室、9………セルプレート、10………バグフィルタろ布回収装置、12………供給ダクト、14………集塵室、16………排出ダクト、18………フィルタ付ファン、20………逆流防止弁、21………取付開口部、22………リテーナ蓋、24………ダスト飛散防止カバー、26………ろ布巻き取り装置、28………回転モータ、30………ろ布取付け穴、32………ダスト、34………ダスト噴出しノズル。[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a bag filter filter cloth collecting method, and in particular, collects a filter cloth constituting a bag filter while maintaining ventilation of the bag filter section from the discharge side of the filter cloth to be collected under negative pressure in the bag filter. The present invention relates to a bag filter filter cloth collecting method and apparatus.
[0002]
[Prior art]
In order to prevent air pollution, a dust collector that regenerates exhaust gas discharged from a garbage incinerator or the like into clean gas is generally widely used. FIG. 4 is a diagram showing an outline of a dust collection process of dust contained in exhaust gas. As shown in the figure, exhaust gas 1 generated from an incinerator or the like is sent into a dust-containing gas chamber 4 inside the dust collector 3 through a pushing fan 2. A large number of long tubular bag filters 5 extending in the longitudinal direction of the dust collector 3 are installed in the dust-containing gas chamber 4. FIG. 5 is a cross-sectional view showing the attachment state of the bag filter. The bag filter 5 formed of a cage 6 for holding the shape of the bag filter 5 and the filter cloth 7 covering the surface of the bag filter 5 under the flow of the exhaust gas is in the shape of a long cylinder, the upper end portion is in a flange shape, and the lower end is Blocked. The bag filter 5 is fitted in a mounting opening provided in a cell plate 9 that is a boundary surface between the dust-containing gas chamber 4 and the dust-free gas chamber 8. The supplied exhaust gas 1 in the dust-containing gas chamber 4 passes through the bag filter 5 and moves to the dust-free gas chamber 8. When the exhaust gas 1 passes through the bag filter 5, a filter cloth 7 serving as a filter is provided on the surface of the bag filter 5, and dust in the exhaust gas 1 does not pass through and adheres to the surface of the filter cloth 7. To be collected. The gas that has passed through the bag filter 5 and has removed dust and has been purified is discharged from the dust-free gas chamber 8 to the outside as dust-free gas. Since dust contained in the exhaust gas accumulates on the surface of the filter cloth 7 during the dust collection process, the filter cloth 7 is periodically cleaned by air injection from the discharge side of the bag filter mounting opening. If the filter cloth 7 is used for a long time, the dust collection efficiency is deteriorated due to deterioration, clogging, and the like. Therefore, it is necessary to periodically replace the filter cloth 7. However, special attention is required because the dust adhering to the filter surface may contain dioxins.
[0003]
Conventional bag filter replacement work requires direct contact with dust-attached filter cloth and sometimes requires entry into a dust collection chamber in which dust has accumulated. Workers wear dust-proof clothing, airline masks, etc., and take measures to completely avoid contact with dust. However, although workers wear dust-proof clothing, if the dust-proof clothing is damaged due to catching on the equipment or falling, the worker is at high risk of being exposed to dust and may be exposed to dioxins. is there. On the other hand, in the bag filter replacement work in Patent Document 1, the dust collection chamber is sucked during the replacement work, and the removed bag filter is dropped and replaced at the lower part of the dust collector. Inadequate, and prevention of scattering of dust generated from the filter removed during the replacement work to the outside air is insufficient.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 6-335612
[Problems to be solved by the invention]
In the bag filter collection operation, in order to reduce the risk of exposure to the worker's dioxins, it is most important to reduce the opportunity for the operator to come into contact with dust. In the conventional method, measures for preventing dust scattering from the inside of the bag filter generated during the work to the outside are insufficient, and the suction efficiency is not effective because the inside of the dust collector is not a closed system. In addition, workers are protected by dust-proof clothing, etc., but there are cases where it is necessary to touch a contaminated filter cloth directly. The object of the present invention is to eliminate the drawbacks of the prior art, increase the suction efficiency in the dust collector in the filter cloth collecting work of the bag filter, and can collect the filter cloth even if the worker does not enter the dust-containing gas chamber. It is intended to provide a bag filter filter cloth collection method that reduces exposure to dioxins and facilitates collection work.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the bag filter filter cloth collecting method according to the present invention is a bag filter filter cloth collecting method in a dust collector, which closes a bag filter attachment opening that is not a collection work target and is a collection work target. Covering the opening of the bag filter with a dust scattering prevention cover, keeping the dust collection chamber at a negative pressure, and maintaining the ventilation of the bag filter portion to be collected by attaching the dust scattering prevention cover, It is characterized by collecting the constituent filter cloth. Further, the filter cloth is collected from the discharge side of the opening at the attachment opening of the bag filter to be collected. Further, the bag filter filter cloth collecting device in the dust collector is a suction fan that keeps the dust collection chamber at a negative pressure, a lid that can close the bag filter mounting opening, and the bag filter mounting opening from the discharge side. It is set as the structure provided with the collection | recovery apparatus which collect | recovers filter cloth, and the dust scattering prevention cover which prevents the dust scattering from the filter cloth to collect | recover.
[0007]
[Action]
In this way, the mounting opening of the bag filter that is not subject to collection work is closed, so the area of the air inlet can be reduced, and the bag filter is kept at a negative pressure with the suction speed increased. Can do. In addition, the operator can perform the filter cloth recovery work while allowing air to flow in from the discharge side of the bag filter mounting opening without entering the dust-containing gas chamber, thereby efficiently preventing the opportunity to come into contact with dust. be able to.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a bag filter filter cloth collecting method and apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic view showing a bag filter filter cloth collecting method according to the present invention. The bag filter filter cloth collecting device 10 includes a supply duct 12 that supplies exhaust gas, a dust collection chamber 14, and a discharge duct 16 that discharges dust-free gas. On the exhaust gas supply side, a pushing fan 2 for sending exhaust gas is installed in the dust collecting chamber 14 through a supply duct 12. A fan 18 with a filter and a backflow prevention valve 20 are installed between the pushing fan 2 and the dust collecting chamber 14. The filter-equipped fan 18 is configured to suck the inside of the dust collection chamber 14 and keep the inside at a negative pressure during the filter cloth collecting operation. In addition, since the filter 18 for removing dust is installed in the fan 18 with a filter, the dust in the dust-containing gas chamber generated during the collection operation can be collected. A backflow prevention valve 20 installed between the fan 18 with filter and the pushing fan 2 prevents the backflow of exhaust gas from the pushing fan 2 side during the recovery operation. On the other hand, the dust collection chamber 14 includes a dust-containing gas chamber 4 into which exhaust gas flows and a dust-free gas chamber 8. Inside the dust-containing gas chamber 4, a plurality of long cylindrical bag filters 5 hang down from attachment openings 21 provided in a cell plate 9 that forms a boundary surface between the dust-containing gas chamber 4 and the dust-free gas chamber 8. Installed. The surface of the bag filter 5 is covered with a filter cloth 7. The filter cloth 7 plays a role of filtering dust in the exhaust gas. In the dust-free gas chamber 8, there is a retainer lid 22 that covers the attachment opening 21 of the bag filter 5 that is not the object of collection work, a dust scattering prevention cover 24 that covers the attachment opening 21 of the bag filter 5 that performs the collection work, and nothing. A discharge duct 16 through which dust gas is discharged is installed. The dust scattering prevention cover 24 has a box shape covering the cross section of the filter cloth collected from the attachment opening 21 of the bag filter 5, and has a bottom-out structure for collecting the filter cloth 7 from the bottom surface. A filter cloth take-up device 26 is provided inside the dust scattering prevention cover 24, and the shaft of the filter cloth take-up device 26 is connected to a rotary motor 28 so that the filter cloth 7 collected from the bottom surface is automatically taken up. ing. The retainer lid 22 is a plate-like lid that seals the inside of the bag filter that covers the cross section of the filter cloth that is not a collection work target. The shape of the retainer lid 22 is not particularly limited as long as it is a non-breathable lid. By closing the attachment opening 21 of the bag filter 5 that is not subject to collection work with the retainer lid 22 at the time of suction during filter cloth collection work, ventilation from the exhaust side is prevented and suction efficiency in the bag filter is increased. Thereby, the vent hole area of the attachment opening 21 of the bag filter 5 can be suppressed to the minimum, the inflow speed into the bag filter can be increased, and the suction capacity of the suction fan can be set small.
[0009]
The work procedure of the bag filter filter cloth collection method will be described below. After the exhaust gas dust collection operation is completed, the pushing fan 2 that supplies the exhaust gas into the dust collecting chamber 14 is stopped, and the operator can move between the dust collecting chamber 14 and the pushing fan 2 on the upstream side of the supply duct 12. The installed backflow prevention valve 20 is closed to prevent the exhaust gas from flowing into the dust collecting chamber 14 from the pushing fan 2 side. Next, it enters from the dust-free gas chamber 8 above the dust collection chamber 14, and the attachment opening 21 of the bag filter 5 that is not the object of collection work is closed by the retainer lid 22. Subsequently, the fan 18 with a filter installed in the supply duct 12 between the backflow prevention valve 20 and the dust collecting chamber 14 is operated to suck the inside of the bag filter. At this time, the inside of the dust collecting chamber 14 is a closed system, but since only the upper portion of the filter cloth to be collected is opened, the air flowing in from here is sucked toward the fan 18 with a filter. Therefore, the worker performs the work of removing the cage 6 incorporated in the bag filter. After the completion of the extraction work, the attachment opening 21 of the bag filter 5 is covered with a dust scattering prevention cover 24. At this time, the cover ceiling surface is open, so that ventilation is provided. The flange portion of the filter cloth opening cross section is fastened to the roller portion of the filter cloth take-up device 26 provided in the dust scattering prevention cover 24. At this time, since a series of operations so far is a state in which air flows into the filter from the attachment opening 21 of the bag filter 5 to be collected, dust can be prevented from scattering into the dust-free gas chamber 8. Under this bag filter negative pressure, the operator automatically winds the filter cloth 7. The collected filter cloth 7 is accommodated in the dust scattering prevention cover 24 and can be carried outside in a sealed state. Finally, a new filter cloth 7 with the cage 6 removed is inserted into the attachment opening 21 of the bag filter 5 to be collected, and the filter cloth collection work is completed.
[0010]
In the embodiment of the present invention, the suction fan 18 with a filter is installed in the supply duct 12 between the dust collection chamber 14 and the backflow prevention valve 20, but the setting may be anywhere as long as the purpose is to suck the dust-containing gas chamber 4. For example, it may be configured to be directly connected to the dust-containing gas chamber 4 separately from the supply duct 12. Further, in the embodiment of the present invention, suction is performed using the fan 18 with a filter, but the filter may be anywhere between the dust collection chamber 14 and the suction fan, for example, a supply duct connected to the dust collection chamber 14. 12 connection ports may be used. Further, in the embodiment of the present invention, the collection of the filter cloth 7 has been described using the filter cloth automatic winding device 26. However, the filter cloth 7 can be stored in the dust scattering prevention cover 24 and easily carried, and the dust is not scattered outside. If it is, it will not be restricted to this, For example, you may use a folding-type collection | recovery apparatus.
[0011]
FIG. 2 shows a dust scattering prevention suction experiment simulating a dust scattering source under the condition that the bag filter has a negative pressure in order to prevent dust ejected from the filter cloth opening at the time of replacement work. As shown in FIG. 2, the speed at which the dust 32 is ejected upward from the dust ejection nozzle 34 is assumed to be the ejection wind speed V <b> 1 by simulating the generation of the dust 32 in the vicinity of the filter cloth attachment hole 30. On the other hand, when the suction wind speed in the downward direction by the suction fan is V2, the influence of the suction wind speed V2 on the dust ejection wind speed V1 is examined. Assuming that the dust 32 is blown up from the ejection port, the number of dusts was measured with a dust counter at a position 30 cm above the scattering source and 10 cm lateral from the scattering source.
[0012]
FIG. 3 is a diagram showing experimental results of dust scattering prevention suction shown in FIG. The horizontal axis represents V1 / V2, and the vertical axis represents the dust atmosphere concentration (mg / m 3 ). When the initial value of the measurement position before dust ejection was measured, it was a dust atmosphere concentration of 0.25 mg / m 3 , so it was determined that dust was not scattered if it was below this measurement value. As a result, according to the measurement graph, dust is not scattered around at V1V2 = 0.45 or more. That is, if the suction wind speed in the filter can be more than twice the dust scattering wind speed, the filter cloth can be collected without dust scattering.
[0013]
Simulating actual filter cloth collection work, and removing the filter cloth to the bag filter discharge side, when the obstruction lid is not installed on the bag filter discharge side, sucking the bag filter with a suction fan, and not being removed Table 1 shows the result of measuring the dust scattering density when the bag filter was closed with a lid.
[Table 1]
Figure 0004178388
Measurement position (1)-Position 50 cm from the filter cloth extraction position and height 50 cm Measurement position (2)-Position 200 cm from the filter cloth extraction position and height 50 cm [0014]
The dust scattering concentration was measured according to work environment measurement standards. At this time, the dust scattering concentration without scattering countermeasures was set as 1. As a result, the dust scattering concentration can be suppressed to a detection limit value or less in a state where the parts other than the extraction hole are closed with a lid and the bag fill is set to a negative pressure as compared with the case where the countermeasure is not performed.
[0015]
【The invention's effect】
As described above, according to the present invention, in the bag filter filter cloth collection method in the dust collector, the bag filter attachment opening that is not the collection work target is closed, and the bag filter attachment opening that is the collection work target is dust-covered. Covering with a scattering prevention cover, maintaining a negative pressure in the dust collection chamber, and collecting the filter cloth constituting the bag filter while maintaining the ventilation of the bag filter portion to be collected by attaching the dust scattering prevention cover. The feature is as follows. Thereby, since the attachment opening part of the bag filter which is not a collection work object is closed, the suction efficiency in the dust collector can be increased. Further, since the filter cloth collecting operation is performed while maintaining the ventilation from the discharge side of the filter cloth to be collected, dust scattering outside the bag filter can be prevented. Furthermore, since the filter cloth is recovered from the exhaust side of the bag filter mounting opening, the operator can perform the filter cloth recovery work without entering the dust-containing gas chamber, thereby preventing dust exposure. I can do it.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of a filter cloth collecting apparatus according to the present invention.
FIG. 2 is a diagram showing a dust scattering prevention suction experiment simulating a dust scattering source.
FIG. 3 is a diagram showing the results of a dust scattering prevention suction experiment.
FIG. 4 is a diagram showing an outline of a dust collection process of dust contained in exhaust gas.
FIG. 5 is a cross-sectional view showing the attachment state of the bag filter.
[Explanation of symbols]
1 ......... Exhaust gas, 2 ...... Intrusion fan, 3 ...... Dust collector, 4 ...... Dust-containing gas chamber, 5 ...... Bug filter, 6 ...... Cage, 7 ...... Filter cloth, 8 ......... Dust-free gas chamber, 9 ......... Cell plate, 10 ......... Bag filter filter cloth collecting device, 12 ......... Supply duct, 14 ......... Dust collection chamber, 16 ......... Discharge duct, 18 ... ...... Fan with filter, 20 ......... Backflow prevention valve, 21 ......... Mounting opening, 22 ......... Retainer cover, 24 ......... Dust scattering prevention cover, 26 ......... Filter cloth take-up device, 28 ... ...... Rotary motor, 30 ... Filter cloth mounting hole, 32 ... Dust, 34 ... Dust ejection nozzle.

Claims (3)

集塵機内のバグフィルタろ布回収方法において、回収作業対象外のバグフィルタの取付開口部を閉塞し、回収作業対象となるバグフィルタの取付開口部をダスト飛散防止カバーで覆い、集塵室内を負圧に保ち、前記ダスト飛散防止カバーを取付けた回収作業対象となるバグフィルタ部の通気を保持しつつ、該バグフィルタを構成するろ布を回収することを特徴とするバグフィルタろ布回収方法。In the bag filter filter cloth collection method in the dust collector, the installation opening of the bag filter that is not subject to collection work is closed, the installation opening of the bag filter that is the collection work is covered with a dust scattering prevention cover, and the dust collection chamber is loaded. A bag filter filter cloth collecting method, comprising: collecting a filter cloth constituting the bag filter while maintaining air pressure and maintaining ventilation of the bag filter part to be collected by attaching the dust scattering prevention cover. 回収作業対象となるバグフィルタの取付開口部において、ろ布を前記開口部の排出側から回収することを特徴とする請求項1記載のバグフィルタろ布回収方法。2. The bag filter filter cloth collecting method according to claim 1, wherein the filter cloth is collected from the discharge side of the opening at the attachment opening of the bag filter to be collected. 集塵機内のバグフィルタろ布回収装置であって、集塵室内を負圧に保つ吸引ファンと、バグフィルタの取付開口部を閉塞可能な蓋と、バグフィルタの取付開口部の排出側からろ布を回収する回収装置と、回収するろ布からのダスト飛散を防止するダスト飛散防止カバーとを備えたことを特徴とするバグフィルタろ布回収装置。Bag filter filter cloth collection device in a dust collector, a suction fan that maintains a negative pressure in the dust collection chamber, a lid that can close the bag filter mounting opening, and a filter cloth from the bag filter mounting opening discharge side A bag filter filter cloth collecting device comprising: a collecting device for collecting the dust and a dust scattering prevention cover for preventing dust scattering from the collected filter cloth.
JP2002379920A 2002-12-27 2002-12-27 Bag filter filter cloth collecting method and apparatus Expired - Fee Related JP4178388B2 (en)

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