JP3941866B2 - Method and apparatus for adding powder in liquid - Google Patents

Method and apparatus for adding powder in liquid Download PDF

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JP3941866B2
JP3941866B2 JP2002300147A JP2002300147A JP3941866B2 JP 3941866 B2 JP3941866 B2 JP 3941866B2 JP 2002300147 A JP2002300147 A JP 2002300147A JP 2002300147 A JP2002300147 A JP 2002300147A JP 3941866 B2 JP3941866 B2 JP 3941866B2
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powder
pipe
discharge
gas
submerged
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JP2004130281A (en
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哲朗 森岡
光治 小島
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Fujifilm Corp
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Fujifilm Corp
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Description

【０００１】
【産業上の利用分野】
本発明は粉体をタンクなどの液中に添加する粉体の液中添加方法及び装置に関するものである。
【０００２】
【従来の技術】
【特許文献１】
特開平９−３２３８２１号公報（［００２６］，図４）
【０００３】
非常に舞い易い粉体をタンク上部から溶媒の液面に投入した場合に、投入した粉体が舞い出してしまい、規定の投入量が狂ってしまうことがある。また、粉体が舞い出してしまうと、作業環境上も好ましくない。このため、液中に先端が没した液中添加配管を用いて、粉体を液中で添加することが行われている（例えば、特許文献１）。
【０００４】
【発明が解決しようとする課題】
しかしながら、液中添加配管を用いて粉体を液中で添加する場合には、親水性の粉体の場合には、液中添加配管の先端付近で、水を吸った粉体がペースト状となって配管内面に付着し、配管が閉塞してしまう問題があった。
【０００５】
本発明は上記課題を解決するためのものであり、液中添加配管を用いて粉体を液中で添加する際に、液中添加配管内の閉塞を防止して、粉体の液中添加を安定して行えるようにした粉体の液中添加方法及び装置を提供することを目的とする。
【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、本発明では、液中添加配管を用いて粉体を液中に添加する粉体の液中添加方法において、フレコンバックに接続治具と払出管とを接続し、接続治具または払出管に設けた払出用ガス吹き出し口から前記フレコンバック内部へガスを吹き出して該フレコンバックから粉体を払い出すとともに、接続治具または払出管に設けた搬送用ガス吹き出し口からガスを粉体払出方向へ向けて吹き出して粉体を搬送するフレコンバック払出し工程と、前記払出管に設けた粉体ポンプにより前記液中添加配管に粉体を送る粉体搬送工程と、前記液中添加配管の少なくとも液中配置部分の内面を樹脂コーティングしておき、前記粉体ポンプの粉体吐出側の前記液中添加配管に、粉体搬送方向に向けて配置される搬送ガスの吹き出し口から搬送ガスを吹き出して、前記搬送ガスの前記液中添加配管内の出口付近の流速を２．０ｍ／ｓ以上として粉体を液中に送る粉体排出工程とを有することを特徴とする。また、本発明は、前記払出用ガス吹き出し口からガスを吹き出して前記フレコンバックを膨らました後に、前記搬送用ガス吹き出し口からガスを吹き出して粉体を払いだすことを特徴とする。また、本発明は、前記搬送ガスの吹き出し口を粉体ポンプ近くに設けることを特徴とする。
【０００７】
また、本発明では、粉体を粉体ポンプによって液中添加配管へ送り出し、この液中添加配管を用いて粉体を液中に添加する粉体の液中添加装置において、前記粉体ポンプの粉体吐出側の前記液中添加配管に設けられ、粉体搬送方向へ向けて搬送エアを吹き出すとともに、前記液中添加配管の出口付近の搬送エアの流速を２．０ｍ／ｓ以上とする搬送エア吹き出し手段を備えている。
【０００８】
本発明の粉体の液中添加装置は、フレコンバックに接続される接続治具、前記接続治具に接続される払出管、前記接続治具または払出管に設けられ、前記フレコンバック内部へガスを吹き出して該フレコンバックから粉体を払い出す払出用ガス吹き出し口、前記接続治具または払出管に設けられ、ガスを粉体払出方向へ向けて吹き出して粉体を搬送する搬送用ガス吹き出し口を有するフレコンバック払出し部と、前記払出管に設けられ、前記液中添加配管に粉体を送る粉体ポンプと、前記粉体ポンプの粉体吐出側の前記液中添加配管に、粉体搬送方向に向けて配置され、搬送ガスを吹き出して粉体を送る搬送ガスの吹き出し口、前記液中添加配管の少なくとも液中配置部分の内面が樹脂コーティングされている樹脂コーティング部、前記搬送ガスの前記液中添加配管内の出口付近の流速を２．０ｍ／ｓ以上として粉体を液中に送るために前記搬送ガスの吹き出し口から前記搬送ガスを供給する搬送ガス供給部を有する粉体排出部とを備えることを特徴とする。
【０００９】
フレコンバック１０の下部は、円錐形状に絞られて形成されており、これの下部に排出口１０ａが設けられている。この排出口１０ａには、本発明の粉体払出接続治具１５がカップリング１６を介して取り付けられている。フレコンバック１０には例えばシリカ粉体が収納されている。
【００１０】
図２及び図３に示すように、カップリング１６は、フレコンバック１０の排出口１０ａに取り付けられる雄型カップリング部材１７と、これを保持する雌型カップリング部材１８とから構成されている。雌型カップリング部材１８には粉体払出接続治具１５が固着されている。また、雌型カップリング部材１８には、締結レバー２１が取り付けられており、これを操作することで、両カップリング部材１７，１８を締結（実線表示）または締結解除（二点鎖線表示）することができる。
【００１１】
図３に示すように、粉体払出接続治具１５は、レデューサからなる外筒体２３と、パイプからなる内筒体としての粉体誘導管２４と、粉体誘導管２４を外筒体２３に固定するメクラ板２５及びソケット２６と、粉体払出用エア吹き出し管２７と、粉体搬送用エア吹き出し管２８とから構成されている。
【００１２】
粉体払出用エア吹き出し管２７はＬ字形に形成されており、ノズル部２７ａとエルボ部２７ｂと連通部２７ｃとから構成されている。ノズル部２７ａは取付板２９を介して粉体誘導管２４に固定されている。連通部２７ｃは、粉体誘導管２４と外筒体２３とを貫通し、外部に連結口２７ｄが突出している。
【００１３】
粉体搬送用エア吹き出し管２８は、外筒体２３を貫通するように取り付けられており、粉体搬送用エアを外筒体２３内に送り込む。これら各吹き出し管２７，２８にはバルブ３０，３１及びワンタッチカップリング３２，３３を介してエア供給ホース３４，３５が接続されている。
【００１４】
図４に示すように、外筒体２３の下部接続口２３ａには払出管４０が接続されており、この払出管４０を介して粉体ポンプ４１の供給口４１ａに接続されている。粉体ポンプ４１は、エア駆動式ダイアフラムポンプが用いられるが、粉体をエアで搬送するタイプであればよく、他の粉体ポンプを用いてもよい。
【００１５】
粉体ポンプ４１の粉体吐出口４１ｂには粉体搬送管４２が接続されており、この粉体搬送管４２により、シリカ粉体が液中添加槽５０（図１参照）に送られる。粉体搬送管４２の粉体吐出口４１ｂ近くには搬送用エア吹き出し管４３が粉体搬送方向に向けてエアを吹き出すように配置されている。この搬送用エア吹き出し管４３にはバルブ４４、ワンタッチカップリング４５及びエアホース４６を介してエアー供給源４７が供給される。エア供給源４７には図示しない圧力調節弁が設けられており、各吹き出し管２７，２８，４３へのエア供給圧力が調節される。
【００１６】
図１に示すように、液中添加槽５０は、槽本体５１と攪拌器５２とから構成されており、予めイオン交換水５３とカチオン性樹脂（ジアリルアンモニウム塩誘導体ポリマー）とが入れられている。攪拌器５２はディゾルバ式の攪拌羽根５２ａとこれを回転するモータ５２ｂとから構成されている。槽本体５１の内部周面に邪魔板５４が槽本体５１の円周方向で４個配置されており、粉体とイオン交換水５３とカチオン性樹脂とが効率よく分散または混合される。なお、邪魔板５４の形状や配置個数などは適宜変更してよい。
【００１７】
液中添加槽５０には粉体搬送管４２の先端４２ａが液中に没するように配置されている。これにより、粉体が舞い上がることなくイオン交換水５３に添加される。液中添加槽５０における粉体搬送管４２の先端位置は液中であれば任意でよいが、攪拌羽根５２ａの上部の負圧部分に先端４２ａを配置した場合には、粉体の分散性は向上するものの、粉体流量が多くなった場合にキャビテーションを起こし易くなってしまう。このため、なるべく液面から下の位置に先端４２ａを位置させることが好ましい。そして、攪拌回転数を上げることにより分散性を高める。
【００１８】
この粉体搬送管４２のうち、図５に示すように、少なくとも液中添加槽５０内に位置する管本体７０の内壁面はテフロン（登録商標）コーティングされており、樹脂コーティング層７１が設けられている。また、粉体搬送用エアが粉体ポンプ４１の出口側から供給されているので、粉体搬送管４２の先端付近で、吸湿してペースト状となった粉体が付着することが防止され、粉体詰まりなどの発生がなくなる。
【００１９】
液中添加槽５０でシリカ粉体やカチオン性樹脂が分散または混合されたイオン交換水は、図示しない排出口及びバルブを介して微分散工程へ送られる。微分散後にバインダー、硬膜剤、塗布助剤などとブレンドし、塗布液を作製する。この塗布液をウェブに塗布し、製品としてのインクジェット記録紙が製造される。
【００２０】
次に、本実施形態の作用を説明する。図１に示すように、フレコンバック１０をウインチ１２により吊り下げて、カップリング１６を介して、粉体払出接続治具１５をフレコンバック１０に取り付ける。粉体払い出しでは、図４に示すように、まず粉体払出用エア吹き出し管２７からエアが吹き出され、フレコンバック１０を膨らませる。次に、粉体搬送用エア吹き出し管２８からエアを吹き出した後に、粉体ポンプ４１を運転し、粉体搬送を実施する。
【００２１】
このように、フレコンバック１０内へ払出用エアを専用の吹き出し管２７を用いて導入することにより、フレコンバック１０内の下部における粉体のブリッジ形成が抑制される。また、フレコンバックの下部が絞り込まれることがなくなるため、粉体払出口の閉塞がなくなり、粉体を円滑に払いだすことができる。しかも、粉体誘導管２４を備えるため、フレコンバック下部の絞り込みが確実になくなり、粉体排出口付近における閉塞の防止が図られる。また、粉体ポンプ４１の下流側に搬送用エアを導入することにより、接続治具１５から投入するエア量を減らすことができ、粉体払出流量を多くすることができる。
【００２２】
なお、フレコンバック１０内へ向けての粉体払出用エア吹き出し管２７からの払出エアー吹き出し量は１〜３Ｎｍ3 ／ｈ、払出管４０へ向けての粉体搬送用エア吹き出し管２８の搬送エアのエア吹き出し量は０〜３Ｎｍ3 ／ｈ、粉体ポンプ４１以降の粉体搬送管４２へ向けての搬送用エア吹き出し管４３からの搬送エアのエア吹き出し量は９〜１０Ｎｍ3 ／ｈとすることが好ましい。また、エアを用いて粉体を搬送しているが、これは他の例えば窒素ガス，不活性ガスなどを用いてもよい。
【００２３】
また、粉体搬送管４２の内径などは搬送用エア吹き出し管４３からの搬送エアの吹き出し量や、粉体搬送量に基づき決定される。例えば、搬送エアの吹き出し量が９〜１０Ｎｍ3 ／ｈの場合には、配管径を３２Ａ、または４０Ａにすることで、搬送エアの流速を２．０ｍ／ｓ以上にすることができる。
【００２４】
次に、本発明の実施例について説明するが、本発明は以下に示す実施例のみに限定されるものではない。また、特に断らない限り、実施例中の「部」及び「％」はそれぞれ質量部、質量％を示す。
【００２５】
［実施例］
図１に示すように、ＢＥＴ法による比表面積３００ｍ2 ／ｇの気相法シリカ粉体（ＱＳ−３０（株）トクヤマ製）が５０ｋｇ入ったフレコンバック１０から、シリカ粉体を払い出し、予めジアリルアンモニウム塩誘導体ポリマーが入れられたイオン交換水５３に液中添加する工程において、図２、図３に示すような接続治具１５を用いて、まずフレコンバック１０の内部へエアを導入してフレコンバック１０を膨らました後に、搬送エアを接続治具１５とポンプ下流側の粉体搬送管４２に導入し、次に粉体ポンプ４１を運転して粉体搬送を実施した。粉体搬送中もフレコンバック１０内へのエア吹き出しは続行した。フレコンバック１０内へ向けての払出エアー吹き出し量は３Ｎｍ3 ／ｈであり、払出管４０へ向けての搬送エアのエア吹き出し量は３Ｎｍ3 ／ｈであり、ポンプ後の搬送管４２へ向けての搬送エアのエア吹き出し量は１０Ｎｍ3 ／ｈであった。この実施例では、連続的に６．０ｋｇ／ｍｉｎでの粉体搬送が行えた。また、タンクへの液中添加配管は、流速が２．０ｍ／ｓ以上となる配管径（３２Ａ，４０Ａ）にすることにより、配管内での粉体閉塞の発生はなかった。
【００２６】
［比較例１］
粉体及びフレコンバックから液中添加配管前までの機器構成は実施例と同じであるが、液中添加配管の径を５０Ａと大きくし、流速を１．１ｍ／ｓとしたところ、３００ｋｇ程度の粉体を液中添加した時点で、吸湿してペースト状となったシリカ粉体で、液中添加配管の内部が閉塞してしまった。
【００２７】
［比較例２］
粉体及びフレコンバックから液中添加配管前までの機器構成は実施例と同じであるが、搬送管４２へ向けてのエア吹き出し量を調整し、流速１．９ｍ／ｓとした。この比較例２では、吸湿してペースト状となったシリカ粉体によって液中添加配管の内部が閉塞してしまった。
【００２８】
【発明の効果】
本発明によれば、粉体を搬送エアの吹き出しによって搬送し、液中添加配管を用いて粉体を液中に添加する際に、搬送エアの液中添加配管内の流速を２．０ｍ／ｓ以上とすることにより、液中添加配管内で粉体がペースト状となって管内壁に付着することがなくなる。これにより、液中添加配管の閉塞が防止され、液中に粉体を安定的に供給することができる。
【００２９】
また、液中添加配管に接続される粉体ポンプを備え、この粉体ポンプの粉体吐出側の前記液中添加配管に、搬送エアの吹き出し口を粉体搬送方向へ向けて配置し、搬送エアの吹き出しを行うことにより、粉体搬送が中断した場合であっても搬送エアが液中添加配管から吹き出されるため、液中添加配管の閉塞が防止される。また、粉体容器の払出口に粉体搬送用エアの吹き出し口を設けることにより、同様にして液中添加配管の閉塞が防止される。さらに、液中添加配管の少なくとも液中配置部分の内面を樹脂コーティングすることにより、ペースト状の粉体の付着が防止され、管閉塞が無くなる。
【図面の簡単な説明】
【図１】本発明のフレコンバックの粉体払出装置の全体を示す概略図である。
【図２】フレコンバックの粉体払出接続治具を示す正面図である。
【図３】粉体払出接続治具を示す縦断面図である。
【図４】粉体排出接続治具とポンプとを示す概略の断面図である。
【図５】粉体搬送管の先端付近を示す一部を切り欠いた断面図である
【符号の説明】
１０ フレコンバック
１５ 粉体払出接続治具
１６ カップリング
２３ 外筒体
２４ 粉体誘導管
２７ 粉体払出用エア吹き出し管
２８ 粉体搬送用エア吹き出し管
４０ 払出管
４１ 粉体ポンプ
４２ 粉体搬送管
４３ 搬送用エア吹き出し管
５０ 液中添加槽
５１ 槽本体
５２ 攪拌器
５３ イオン交換水
７１ 樹脂コーティング層[0001]
[Industrial application fields]
The present invention relates to a powder addition method and apparatus for adding powder to a liquid such as a tank.
[0002]
[Prior art]
[Patent Document 1]
JP-A-9-323821 ([0026], FIG. 4)
[0003]
When powder that is very easy to fly is thrown into the solvent surface from the upper part of the tank, the thrown-in powder may be thrown out, and the prescribed charge amount may be distorted. In addition, if the powder flutters, it is not preferable in terms of the working environment. For this reason, adding powder in a liquid is performed using the submerged addition piping in which the front-end | tip was immersed in the liquid (for example, patent document 1).
[0004]
[Problems to be solved by the invention]
However, when the powder is added in the liquid using the submerged pipe, in the case of a hydrophilic powder, the water-absorbed powder is in the form of a paste near the tip of the submerged pipe. Then, there was a problem that the pipe adhered to the inner surface of the pipe and the pipe was blocked.
[0005]
The present invention is for solving the above-mentioned problems, and when adding powder in liquid using the submerged pipe, preventing clogging in the submerged pipe and adding the powder in liquid It is an object of the present invention to provide a method and an apparatus for adding powder in a liquid that can be stably performed.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, in the submerged powder addition method of adding powder into the liquid using the submerged addition pipe, a connecting jig and a discharge pipe are connected to the flexible container back, A gas is blown into the flexible container bag from the discharge gas outlet provided in the connection jig or discharge pipe to discharge the powder from the flexible container bag, and from the carrier gas outlet provided in the connection jig or discharge pipe. A flexible container back discharging step for conveying powder by blowing gas toward the powder discharging direction, a powder conveying step for sending powder to the submerged addition pipe by a powder pump provided in the discharging tube, and the liquid The inner surface of at least the liquid placement portion of the intermediate addition pipe is resin-coated, and the carrier gas blowout port arranged in the liquid addition pipe on the powder discharge side of the powder pump toward the powder transfer direction It blows et carrier gas, and having a powder discharge step of sending the powder into the liquid flow rate in the vicinity of the outlet of the liquid additive in the pipe of the carrier gas as above 2.0 m / s. Further, the present invention is characterized in that after blowing gas from the dispensing gas blowing port to inflate the flexible container bag, gas is blown out from the conveying gas blowing port to discharge powder. Further, the present invention is characterized in that the carrier gas outlet is provided near the powder pump.
[0007]
Further, in the present invention, in the submerged powder adding apparatus for sending powder to the submerged addition pipe by the powder pump and adding the powder into the liquid using the submerged pipe, the powder pump Conveying air that is provided in the submerged addition pipe on the powder discharge side, blows out conveying air in the powder conveying direction, and has a conveying air flow rate near the outlet of the submerged addition pipe of 2.0 m / s or more. Air blowing means is provided.
[0008]
An apparatus for adding powder in liquid according to the present invention is provided with a connecting jig connected to a flexible container bag, a discharge pipe connected to the connecting jig, the connecting jig or the discharging pipe, and a gas is introduced into the flexible container bag. A gas discharge port for discharging the powder from the flexible container bag, a gas discharge port for transporting the powder by blowing the gas in the powder discharge direction and conveying the powder A flexible container back delivery unit having a powder delivery system, a powder pump provided in the delivery pipe and sending powder to the submerged addition pipe, and a powder feed to the submerged addition pipe on the powder discharge side of the powder pump. A carrier gas blowout port for blowing out a carrier gas to send powder, a resin coating part in which at least an inner surface of the submerged pipe is resin-coated, and the carrier Powder having a carrier gas supply unit for supplying the carrier gas from the carrier gas outlet in order to send the powder into the liquid at a flow velocity near the outlet in the submerged addition pipe of 2.0 m / s or more And a body discharger.
[0009]
The lower part of the flexible container bag 10 is formed in a conical shape, and a discharge port 10a is provided at the lower part thereof. The powder discharge connecting jig 15 of the present invention is attached to the discharge port 10 a via a coupling 16. For example, silica powder is stored in the flexible container bag 10.
[0010]
As shown in FIGS. 2 and 3, the coupling 16 includes a male coupling member 17 attached to the discharge port 10 a of the flexible container bag 10 and a female coupling member 18 that holds the male coupling member 17. A powder discharge connecting jig 15 is fixed to the female coupling member 18. Further, a fastening lever 21 is attached to the female coupling member 18, and by operating this, the coupling members 17 and 18 are fastened (solid line display) or fastened (two-dot chain line display). be able to.
[0011]
As shown in FIG. 3, the powder discharge connecting jig 15 includes an outer cylinder body 23 made of a reducer, a powder guide pipe 24 as an inner cylinder body made of a pipe, and a powder guide pipe 24 that is an outer cylinder body 23. And a powder discharge air blowing tube 27 and a powder conveying air blowing tube 28.
[0012]
The powder discharge air blowing tube 27 is formed in an L-shape, and includes a nozzle portion 27a, an elbow portion 27b, and a communication portion 27c. The nozzle portion 27 a is fixed to the powder guide tube 24 via the mounting plate 29. The communication part 27c penetrates the powder guide tube 24 and the outer cylinder 23, and a connection port 27d protrudes outside.
[0013]
The powder conveying air blowing tube 28 is attached so as to penetrate the outer cylindrical body 23, and feeds powder conveying air into the outer cylindrical body 23. Air supply hoses 34 and 35 are connected to these blow-out pipes 27 and 28 via valves 30 and 31 and one-touch couplings 32 and 33, respectively.
[0014]
As shown in FIG. 4, a discharge pipe 40 is connected to the lower connection port 23 a of the outer cylindrical body 23, and is connected to a supply port 41 a of the powder pump 41 through the discharge pipe 40. As the powder pump 41, an air-driven diaphragm pump is used. However, any powder pump may be used as long as the powder is conveyed by air.
[0015]
A powder transport pipe 42 is connected to the powder discharge port 41b of the powder pump 41, and the silica powder is sent to the submerged addition tank 50 (see FIG. 1) through the powder transport pipe 42. Near the powder discharge port 41b of the powder transfer pipe 42, a transfer air blowing pipe 43 is arranged so as to blow out air in the powder transfer direction. An air supply source 47 is supplied to the transfer air blowing pipe 43 via a valve 44, a one-touch coupling 45 and an air hose 46. The air supply source 47 is provided with a pressure control valve (not shown), and the air supply pressure to each of the blowing pipes 27, 28, 43 is adjusted.
[0016]
As shown in FIG. 1, the submerged addition tank 50 is comprised from the tank main body 51 and the stirrer 52, and ion-exchange water 53 and cationic resin (diallylammonium salt derivative polymer) are put beforehand. . The stirrer 52 includes a dissolver type stirring blade 52a and a motor 52b for rotating the stirring blade 52a. Four baffle plates 54 are arranged on the inner peripheral surface of the tank body 51 in the circumferential direction of the tank body 51, and the powder, the ion-exchanged water 53, and the cationic resin are efficiently dispersed or mixed. In addition, you may change suitably the shape, arrangement | positioning number, etc. of the baffle plate 54. FIG.
[0017]
In the submerged addition tank 50, the tip 42a of the powder conveyance tube 42 is disposed so as to be immersed in the liquid. Thereby, the powder is added to the ion-exchanged water 53 without rising. The tip position of the powder conveyance tube 42 in the submerged addition tank 50 may be arbitrary as long as it is in the liquid, but when the tip 42a is disposed in the negative pressure portion above the stirring blade 52a, the dispersibility of the powder is Although improved, cavitation tends to occur when the powder flow rate increases. For this reason, it is preferable to position the tip 42a as low as possible from the liquid level. And dispersibility is enhanced by increasing the number of rotations of stirring.
[0018]
As shown in FIG. 5, at least the inner wall surface of the tube main body 70 located in the submerged addition tank 50 is coated with Teflon (registered trademark), and a resin coating layer 71 is provided. ing. In addition, since the powder conveying air is supplied from the outlet side of the powder pump 41, it is prevented that the powder that has absorbed moisture and becomes a paste is attached near the tip of the powder conveying tube 42, Occurrence of powder clogging is eliminated.
[0019]
The ion-exchanged water in which the silica powder or the cationic resin is dispersed or mixed in the submerged addition tank 50 is sent to the fine dispersion step through a discharge port and a valve (not shown). After fine dispersion, it is blended with a binder, a hardener, a coating aid and the like to prepare a coating solution. The coating liquid is applied to a web, and an ink jet recording paper as a product is manufactured.
[0020]
Next, the operation of this embodiment will be described. As shown in FIG. 1, the flexible container bag 10 is suspended by a winch 12, and the powder discharge connecting jig 15 is attached to the flexible container bag 10 through a coupling 16. In the powder discharge, as shown in FIG. 4, first, air is blown out from the powder discharge air blowing pipe 27 to inflate the flexible container bag 10. Next, after air is blown out from the powder carrying air blowing tube 28, the powder pump 41 is operated to carry the powder.
[0021]
In this way, by introducing the discharge air into the flexible container bag 10 using the dedicated blowing pipe 27, the formation of powder bridges in the lower part of the flexible container bag 10 is suppressed. Further, since the lower portion of the flexible container bag is not narrowed down, the powder discharge outlet is not blocked, and the powder can be discharged smoothly. In addition, since the powder guide tube 24 is provided, the lower portion of the flexible container bag is reliably prevented from being narrowed, and blockage in the vicinity of the powder discharge port can be prevented. Further, by introducing the conveying air to the downstream side of the powder pump 41, the amount of air introduced from the connection jig 15 can be reduced, and the powder discharge flow rate can be increased.
[0022]
Note that the amount of air discharged from the powder discharge air blowing tube 27 toward the flexible container bag 10 is 1 to 3 Nm 3 / h, and the conveying air of the powder conveying air blowing tube 28 toward the discharge tube 40 The amount of air blown out is 0 to 3 Nm 3 / h, and the amount of air blown from the carrier air blowing tube 43 toward the powder carrying tube 42 after the powder pump 41 is 9 to 10 Nm 3 / h. It is preferable. Moreover, although powder is conveyed using air, you may use other, for example, nitrogen gas, an inert gas, etc. for this.
[0023]
The inner diameter of the powder transfer tube 42 is determined based on the amount of air blown from the transfer air blowing tube 43 and the amount of powder transferred. For example, when the blowout amount of the carrier air is 9 to 10 Nm 3 / h, the flow velocity of the carrier air can be set to 2.0 m / s or more by setting the pipe diameter to 32 A or 40 A.
[0024]
Next, examples of the present invention will be described, but the present invention is not limited to only the examples shown below. Unless otherwise specified, “parts” and “%” in the examples represent parts by mass and mass%, respectively.
[0025]
[Example]
As shown in FIG. 1, silica powder is discharged from a flexible container bag 10 containing 50 kg of vapor phase silica powder (QS-30, Tokuyama Co., Ltd.) having a specific surface area of 300 m 2 / g according to the BET method, and diallyl in advance. In the step of adding the ammonium salt derivative polymer in the ion-exchanged water 53 in the solution, air is first introduced into the flexible container bag 10 using a connecting jig 15 as shown in FIGS. After the bag 10 was inflated, the carrier air was introduced into the connecting jig 15 and the powder carrier pipe 42 on the downstream side of the pump, and then the powder pump 41 was operated to carry the powder. Air blowing into the flexible container bag 10 continued during powder conveyance. The amount of blown-out air blown out into the flexible container bag 10 is 3 Nm 3 / h, and the amount of air blown out of the carrier air toward the discharge tube 40 is 3 Nm 3 / h, toward the carrier tube 42 after the pump. The air blowing amount of the carrier air was 10 Nm 3 / h. In this example, the powder could be conveyed continuously at 6.0 kg / min. Further, the pipe added to the tank to the liquid had a pipe diameter (32A, 40A) at which the flow rate was 2.0 m / s or more, so that no powder blockage occurred in the pipe.
[0026]
[Comparative Example 1]
The equipment configuration from the powder and flexible container back to before the submerged addition pipe is the same as that of the example, but when the diameter of the submerged addition pipe is increased to 50A and the flow rate is 1.1 m / s, it is about 300 kg. At the time when the powder was added in the liquid, the inside of the liquid-added piping was clogged with the silica powder that was absorbed into a paste.
[0027]
[Comparative Example 2]
The equipment configuration from the powder and flexible container bag to before the submerged addition pipe is the same as in the example, but the amount of air blown toward the transfer pipe 42 was adjusted to a flow rate of 1.9 m / s. In Comparative Example 2, the inside of the submerged addition pipe was blocked by the silica powder that had absorbed moisture and became a paste.
[0028]
【The invention's effect】
According to the present invention, when the powder is conveyed by blowing out the conveying air and the powder is added to the liquid using the submerged addition pipe, the flow rate of the conveying air in the submerged addition pipe is set to 2.0 m / By setting it to s or more, the powder does not become a paste in the submerged addition pipe and adheres to the inner wall of the pipe. Thereby, the clogging of the submerged addition pipe is prevented, and the powder can be stably supplied into the liquid.
[0029]
In addition, a powder pump connected to the submerged addition pipe is provided, and a carrier air outlet is arranged in the submerged addition pipe on the powder discharge side of the powder pump in the direction of conveying the powder. By blowing out the air, the carrier air is blown out from the submerged addition pipe even when the powder conveyance is interrupted, so that the submerged addition pipe is blocked. Further, by providing a powder conveying air outlet at the outlet of the powder container, blocking of the submerged addition pipe is similarly prevented. Further, by coating at least the inner surface of the submerged pipe with the resin, it is possible to prevent the pasty powder from adhering and eliminate the clogging of the pipe.
[Brief description of the drawings]
FIG. 1 is a schematic view showing the whole of a flexible container back powder dispensing apparatus according to the present invention.
FIG. 2 is a front view showing a flexible container back powder discharge connecting jig.
FIG. 3 is a longitudinal sectional view showing a powder discharge connecting jig.
FIG. 4 is a schematic cross-sectional view showing a powder discharge connecting jig and a pump.
FIG. 5 is a cross-sectional view with a part cut away showing the vicinity of the tip of the powder conveyance tube.
DESCRIPTION OF SYMBOLS 10 Flexible container back 15 Powder delivery connection jig 16 Coupling 23 Outer cylinder 24 Powder guide tube 27 Powder delivery air blowing tube 28 Powder delivery air blowing tube 40 Delivery tube 41 Powder pump 42 Powder delivery tube 43 Air blowing pipe for conveyance 50 Submerged addition tank 51 Tank body 52 Stirrer 53 Ion exchange water 71 Resin coating layer

Claims (6)

液中添加配管を用いて粉体を液中に添加する粉体の液中添加方法において、
フレコンバックに接続治具と払出管とを接続し、接続治具または払出管に設けた払出用ガス吹き出し口から前記フレコンバック内部へガスを吹き出して該フレコンバックから粉体を払い出すとともに、接続治具または払出管に設けた搬送用ガス吹き出し口からガスを粉体払出方向へ向けて吹き出して粉体を搬送するフレコンバック払出し工程と、
前記払出管に設けた粉体ポンプにより前記液中添加配管に粉体を送る粉体搬送工程と、
前記液中添加配管の少なくとも液中配置部分の内面を樹脂コーティングしておき、前記粉体ポンプの粉体吐出側の前記液中添加配管に、粉体搬送方向に向けて配置される搬送ガスの吹き出し口から搬送ガスを吹き出して、前記搬送ガスの前記液中添加配管内の出口付近の流速を２．０ｍ／ｓ以上として粉体を液中に送る粉体排出工程とを有することを特徴とする粉体の液中添加方法。 In the in-liquid addition method of the powder in which the powder is added into the liquid using the in-liquid addition pipe,
Connect the connection jig and discharge pipe to the flexible container bag, blow out the gas from the discharge gas outlet provided in the connection jig or discharge pipe into the flexible container bag, and discharge the powder from the flexible container bag. A flexible container back discharging step of conveying powder by blowing gas in a powder discharging direction from a conveying gas blowing port provided in a jig or a discharging pipe;
A powder conveyance step of sending powder to the submerged addition pipe by a powder pump provided in the discharge pipe;
The inner surface of at least the submerged pipe of the submerged pipe is coated with a resin, and the carrier gas disposed in the submerged pipe on the powder discharge side of the powder pump is arranged in the powder transport direction. A powder discharging step of blowing the carrier gas from the outlet and sending the powder into the liquid at a flow velocity of 2.0 m / s or more in the vicinity of the outlet of the carrier gas in the submerged pipe. To add powder to liquid. 前記払出用ガス吹き出し口からガスを吹き出して前記フレコンバックを膨らました後に、前記搬送用ガス吹き出し口からガスを吹き出して粉体を払いだすことを特徴とする請求項１記載の粉体の液中添加方法。2. The powder in a liquid according to claim 1, wherein after the gas is blown out from the discharge gas outlet and the flexible container bag is inflated, the gas is blown out from the carrier gas outlet and the powder is discharged. How to add. 前記搬送ガスの吹き出し口を粉体ポンプ近くに設けることを特徴とする請求項１または２記載の粉体の液中添加方法。  3. The method for adding powder in liquid according to claim 1, wherein the carrier gas outlet is provided near the powder pump. 液中添加配管を用いて粉体を液中に添加する粉体の液中添加装置において、
フレコンバックに接続される接続治具、前記接続治具に接続される払出管、前記接続治具または払出管に設けられ、前記フレコンバック内部へガスを吹き出して該フレコンバックから粉体を払い出す払出用ガス吹き出し口、前記接続治具または払出管に設けられ、ガスを粉体払出方向へ向けて吹き出して粉体を搬送する搬送用ガス吹き出し口を有するフレコンバック払出し部と、
前記払出管に設けられ、前記液中添加配管に粉体を送る粉体ポンプと、
前記粉体ポンプの粉体吐出側の前記液中添加配管に、粉体搬送方向に向けて配置され、搬送ガスを吹き出して粉体を送る搬送ガスの吹き出し口、前記液中添加配管の少なくとも液中配置部分の内面が樹脂コーティングされている樹脂コーティング部、前記搬送ガスの前記液中添加配管内の出口付近の流速を２．０ｍ／ｓ以上として粉体を液中に送るために前記搬送ガスの吹き出し口から前記搬送ガスを供給する搬送ガス供給部を有する粉体排出部とを備えることを特徴とする粉体の液中添加装置。In a powder submerged addition apparatus that adds powder into a liquid using a submerged addition pipe,
A connection jig connected to the flexible container bag, a discharge pipe connected to the connection jig, the connection jig or the discharge pipe is provided, and gas is blown into the flexible container bag to discharge powder from the flexible container bag. A flexible gas bag discharge unit provided with a discharge gas outlet, the connection jig or the discharge pipe, and having a transfer gas outlet for discharging the gas in the powder discharge direction and conveying the powder;
A powder pump provided in the discharge pipe and for sending powder to the submerged addition pipe;
At least the liquid in the submerged addition pipe, which is disposed in the submerged addition pipe on the powder discharge side of the powder pump in the powder conveyance direction and blows out the carrier gas to send the powder. The carrier gas for feeding the powder into the liquid with a resin coating part in which the inner surface of the middle arrangement part is coated with the resin, the flow rate of the carrier gas near the outlet in the submerged addition pipe being 2.0 m / s or more And a powder discharge section having a carrier gas supply section for supplying the carrier gas from the outlet of the powder. 前記フレコンバック払出し部は、前記払出用ガス吹き出し口からガスを吹き出して前記フレコンバックを膨らました後に、前記搬送用ガス吹き出し口からガスを吹き出して粉体を払いだすことを特徴とする請求項４記載の粉体の液中添加装置。5. The flexible container back discharge unit blows out gas from the discharge gas outlet and inflates the flexible container back, and then blows out gas from the transfer gas outlet and discharges powder. The powder submerged apparatus as described. 前記搬送ガスの吹き出し口を粉体ポンプ近くに設けることを特徴とする請求項４または５記載の粉体の液中添加装置。  6. The apparatus for adding powder in liquid according to claim 4 or 5, wherein the carrier gas outlet is provided near the powder pump.
JP2002300147A 2002-10-15 2002-10-15 Method and apparatus for adding powder in liquid Expired - Lifetime JP3941866B2 (en)

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