JPH0716395B2 - Bubble tower with draft tube - Google Patents
Bubble tower with draft tubeInfo
- Publication number
- JPH0716395B2 JPH0716395B2 JP63192611A JP19261188A JPH0716395B2 JP H0716395 B2 JPH0716395 B2 JP H0716395B2 JP 63192611 A JP63192611 A JP 63192611A JP 19261188 A JP19261188 A JP 19261188A JP H0716395 B2 JPH0716395 B2 JP H0716395B2
- Authority
- JP
- Japan
- Prior art keywords
- draft tube
- liquid
- bubble column
- liquid level
- draft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
- B01F23/2323—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles by circulating the flow in guiding constructions or conduits
- B01F23/23231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles by circulating the flow in guiding constructions or conduits being at least partially immersed in the liquid, e.g. in a closed circuit
- B01F23/232311—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles by circulating the flow in guiding constructions or conduits being at least partially immersed in the liquid, e.g. in a closed circuit the conduits being vertical draft pipes with a lower intake end and an upper exit end
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
- B01F35/32—Driving arrangements
- B01F35/32005—Type of drive
- B01F35/3203—Gas driven
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
- B01F35/32—Driving arrangements
- B01F35/32005—Type of drive
- B01F35/32015—Flow driven
Description
【発明の詳細な説明】 産業上の利用分野 最近、ドラフトチューブ付き気泡塔が液相酸化や微生物
反応等に採用されつつある。このドラフトチューブ付き
気泡塔の欠点の一つは、液レベルを常にドラフトチュー
ブの上端レベル以上に維持しなければならないことであ
る。DETAILED DESCRIPTION OF THE INVENTION Industrial field Recently, a bubble column with a draft tube is being adopted for liquid phase oxidation, microbial reaction and the like. One of the drawbacks of this bubble column with draft tube is that the liquid level must always be maintained above the top level of the draft tube.
しかしながら、実際運転中には通気に伴う液の蒸発また
は流加培養等の操作によって、液レベルが変動（低下）
することがある。However, during actual operation, the liquid level fluctuates (decreases) due to operations such as liquid evaporation or fed-batch culture accompanying aeration.
I have something to do.
従来、運転中の気泡塔内液レベルの正確な検出及び制御
は、発泡、汚れ等を伴う場合特に難しいとされており、
液レベル制御は気泡塔運転上大きな負担となっていた。Conventionally, it is said that accurate detection and control of the liquid level in the bubble column during operation is particularly difficult when foaming, dirt, etc. are involved.
Liquid level control was a heavy burden on the operation of the bubble column.
本発明はこのような液レベルの低下に対しても支障なく
運転できるドラフトチューブを提供するものである。The present invention provides a draft tube that can be operated without trouble even with such a decrease in liquid level.
従来の技術 福田らは、分割されたドラフトチューブを縦方向に連結
し、各段のドラフトチューブの上部に一箇所、水平に多
孔板を設置したものを提案している。［Fukuda H.et a
l.,J.Ferment.Technol.,56,p.618（1978）］ また倉石らは、前記の各段のドラフトチューブにさらに
多孔板を加え、多孔板を計３枚としたものを提案してい
る。［日本発酵学会講演要旨集;p163（1973）］ しかしながら、これらの方式では、液面が丁度各段のド
ラフトチューブ間の開孔部に位置していない場合にはド
ラフトチューブの内側と外側との気液の循環が阻害さ
れ、内筒内でのみ気液の接触が起こることにより、気泡
塔としての性能が低下（酸素移動容量係数KLaが低下）
する。2. Related Art Fukuda et al. Propose a structure in which divided draft tubes are connected in the vertical direction, and a perforated plate is installed horizontally at one location above the draft tubes at each stage. [Fukuda H.et a
L., J.Ferment.Technol., 56 , p.618 (1978)] Also, Kuraishi et al. proposed adding a perforated plate to each of the above-mentioned draft tubes to make a total of three perforated plates. ing. [Abstracts of Proceedings of the Japan Fermentation Society; p163 (1973)] However, in these methods, when the liquid surface is not located at the opening between the draft tubes of each stage, the inside and outside of the draft tube are Since the circulation of gas-liquid is obstructed and the contact of gas-liquid occurs only in the inner cylinder, the performance as a bubble column decreases (the oxygen transfer capacity coefficient K L a decreases).
To do.
発明が解決しようとする課題 本発明は、液レベルの任意の変動に対しても支障なく運
転できるドラフトチューブ付き気泡塔を提供することを
目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a bubble column with a draft tube that can be operated without any trouble even when the liquid level fluctuates.
課題を解決するための手段 本発明のドラフトチューブ付き気泡塔は、塔内にドラフ
トチューブを設けた気泡塔において、該ドラフトチュー
ブの上部に縦方向に分布するように縦方向の長さがドラ
フトチューブ全長に対して1/2以下であり、開孔部にお
ける開孔率が20〜50％の範囲である開孔部が設けられて
いることを特徴とする。Means for Solving the Problems The bubble column with a draft tube of the present invention is a bubble column in which a draft tube is provided in the column, and the vertical length of the draft tube is distributed vertically in the upper part of the draft tube. It is characterized in that the opening portion is provided which is less than 1/2 of the entire length and the opening ratio in the opening portion is in the range of 20 to 50%.
このような構造の気泡塔の一例を第１図により説明する
と、塔１の内部に円筒状のドラフトチューブ２が設けら
れているが、その上部には、縦方向に分布する開孔部と
して複数個の縦スリット３が設けられている。記号４は
ガススパージャーである。An example of the bubble column having such a structure will be described with reference to FIG. 1. A cylindrical draft tube 2 is provided inside the column 1, and a plurality of holes are vertically distributed in the upper part thereof. Individual vertical slits 3 are provided. Symbol 4 is a gas sparger.
この、縦方向に分布する開孔部は第１図及び第２図Ｃに
拡大して示したスリット状のものに限られるものではな
く、第２図Ａに示すように小孔４を縦方向及び円周方向
に多数設けたもの、第２図Ｂに示すように逆三角形の切
り込み５を複数設けたもの、第２図Ｄに示すようにドラ
フトチューブの上部を金網６にしたものなど、適宜選択
して採用できる。The apertures distributed in the vertical direction are not limited to the slit-like ones shown enlarged in FIGS. 1 and 2C, and the small holes 4 can be extended in the vertical direction as shown in FIG. 2A. And those provided with a large number in the circumferential direction, those provided with a plurality of inverted triangular notches 5 as shown in FIG. 2B, those having a wire mesh 6 on the upper portion of the draft tube as shown in FIG. 2D, etc. Can be selected and adopted.
ドラフトチューブの上部に縦方向に分布するように設け
られた開孔部の最下端は、予想される最低液面、或はそ
れ以上低下すれば気泡塔としての機能を発揮しえない液
面に合わせて定めれば良いが、開孔部の縦方向の長さは
ドラフトチューブ全長に対して1/2以下とするのが好ま
しく、開孔部における開孔率は20〜50％の範囲が好まし
い。The lowermost end of the holes provided in the upper part of the draft tube so as to be distributed in the vertical direction is at the expected minimum liquid level, or at the liquid level that cannot function as a bubble column if it lowers more than expected. The length in the vertical direction of the open hole portion is preferably 1/2 or less of the total length of the draft tube, and the open area ratio in the open hole portion is preferably in the range of 20 to 50%. .
第２図に示す４種のドラフトチューブA,B,C,Dの優劣を
比較し、その順位を大小関係で示すと次のようになる。Comparing the superiority and inferiority of the four types of draft tubes A, B, C, and D shown in Fig. 2 and showing their order in magnitude relation is as follows.
（１）製作上:B,C,D＞Ａ （２）液量変動に対するフレキシビリティー:A,C,D＞Ｂ ここで、特に液がドラフトチューブの開孔部下端付近ま
で減少した場合には、液が半径方向に移動するのに有効
な断面積が狭いため、形式Ｂは若干不利となる。結局、
ＡからＤまでの４種類のドラフトチューブはいずれも有
効であるが、上記の２項目（１）と（２）の両方を考慮
すると、形式ＣまたはＤが最も優れていると考えられ
る。(1) Manufacturing: B, C, D> A (2) Flexibility for liquid volume fluctuation: A, C, D> B Here, especially when the liquid is reduced to near the lower end of the draft tube opening. Has a small cross-sectional area that is effective for the liquid to move in the radial direction, which makes Type B slightly disadvantageous. After all,
All of the four types of draft tubes A to D are effective, but in consideration of both the above two items (1) and (2), it is considered that the type C or D is the best.
開孔部を有するドラフトチューブは、ドラフトチューブ
材であるところの無垢のストレートパイプ（板）の上部
を加工して円、矩形、三角形等の開孔を形成することに
より製作できる。A draft tube having an opening can be manufactured by processing an upper portion of a solid straight pipe (plate) which is a draft tube material to form an opening of a circle, a rectangle, a triangle or the like.
または、予め製作した、ドラフトチューブと同径のもの
で開孔部を有する筒（例えば多孔板により成る円筒また
は網を加工して得られる円筒）をドラフトチューブの上
部に接続するようにしてもよい。Alternatively, a prefabricated cylinder having the same diameter as the draft tube and having an opening (for example, a cylinder made of a perforated plate or a cylinder obtained by processing a net) may be connected to the upper portion of the draft tube. .
作用 気泡塔の液面がドラフトチューブの上縁より低下して
も、液はドラフトチューブの上部に縦方向に分布するよ
うに設けられた開孔部を通じて気液がドラフトチューブ
の内、外を支障なく循環するので、液面が高い場合と同
じKLa（酸素移動容量係数）を維持できる。Action Even if the liquid level in the bubble column falls below the upper edge of the draft tube, the liquid will interfere with the inside and outside of the draft tube through the openings provided in the upper part of the draft tube so as to be distributed vertically. Since there is no circulation, the same K L a (oxygen transfer capacity coefficient) as when the liquid level is high can be maintained.
実施例 第１図に示した構造の、径172mmφ、全長150cm、上部に
幅30mm、長さ400mmの縦方向のスリット６個（スリット
／スリット間距離60mm）を設けたドラフトチューブを塔
径250mmφの気泡塔の内部に、塔底からスリット下端ま
での高さが110cmになるように設置し、液レベル及び通
気量を変えて酸素移動容量係数KLaを測定した。Example A draft tube with a diameter of 172 mmφ, a total length of 150 cm, a width direction of 30 mm, and a lengthwise direction of 400 mm with six slits (slit / slit distance 60 mm) having the structure shown in FIG. It was installed inside the bubble column so that the height from the bottom of the column to the lower end of the slit was 110 cm, and the oxygen transfer capacity coefficient K L a was measured by changing the liquid level and the aeration rate.
KLaの測定は、塔内の所定位置にDO計（溶存酸素計）の
センサーを設置し、下記の手順により行った。正し測定
前に予めDO値零及び飽和値を調整しておいた。K L a was measured by the following procedure with a DO meter (dissolved oxygen meter) sensor installed at a predetermined position in the tower. The DO value of zero and the saturation value were adjusted in advance before the measurement.
ローターメーターの指示値を観ながら所定の空気流量
にセットする。Set the specified air flow rate while watching the indicated value on the rotor meter.
バルブ切換えにより空気から窒素に流路を変える。The flow path is changed from air to nitrogen by switching the valve.
塔内のDOが零近くに低下したら再度窒素から空気に変
える。When DO in the tower drops to near zero, change nitrogen to air again.
塔内のDO値の経時変化をデータロガーおよびペンレコ
ーダーに記録する。Record the time-dependent change of the DO value in the tower on the data logger and pen recorder.
測定結果を第３図に示す。第３図において横軸は通気線
速度Ug（cm/s）、縦軸は酸素移動容量係数KLaを表わ
し、◇印は液深110cm（スリットの下端）、○印は液深1
21cm（スリットの下端とスリットの中央との間）、△印
は液深130cm（スリットの中央）、▽印は液深153cm（ド
ラフトチューブの上端）時のデータである。The measurement results are shown in FIG. In Fig. 3, the horizontal axis represents the air flow velocity Ug (cm / s), the vertical axis represents the oxygen transfer capacity coefficient K L a, the ◇ mark is the liquid depth 110 cm (the lower end of the slit), and the ○ mark is the liquid depth 1
21 cm (between the lower end of the slit and the center of the slit), Δ mark is the liquid depth 130 cm (slit center), ▽ mark is the liquid depth 153 cm (upper end of the draft tube).
第３図より、本発明の気泡塔においては、液レベルが次
第に低下して、最終的に開孔部（スリット）の下端に至
っても、なお液レベルの高い場合とほぼ同等のKLaを示
すことが明らかである。From FIG. 3, in the bubble column of the present invention, even if the liquid level gradually decreases and finally reaches the lower end of the opening (slit), the K L a that is almost the same as when the liquid level is still high is obtained. It is clear to show.
即ち本発明のドラフトチューブは、かなり広範囲な液量
変動に対しても、液レベルに依存せず、同一通気量に対
してはほぼ同等のKLaを発揮することが分かり、本発明
の有効性が実証された。That is, it was found that the draft tube of the present invention exerts almost the same K L a for the same air flow rate, regardless of the liquid level, even in a fairly wide range of liquid volume fluctuations. Sex was proved.
発明の効果 気泡塔内液量が減少しても、所定の範囲内であれば党内
の液循環、物質移動、反応（化学反応または微生物反
応）に阻害を与えない。EFFECTS OF THE INVENTION Even if the amount of liquid in the bubble column decreases, liquid circulation, mass transfer and reaction (chemical reaction or microbial reaction) within the party are not hindered within a predetermined range.
したがって運転中厳密な液面コントロールが不要であ
り、また計画変更等によるスケールダウンにも対処でき
るため、運転のフレキシビリティーが増す。Therefore, strict liquid level control is not required during operation, and scale down due to changes in plans can be dealt with, thus increasing the flexibility of operation.
従来、運転中の気泡塔内液レベルの正確な検出及び制御
は発泡、汚れ等を伴う場合、特に難しいとされていた
が、本発明により液レベル制御に関する大幅な負担の軽
減が期待できる。Conventionally, accurate detection and control of the liquid level in the bubble column during operation have been considered to be particularly difficult when foaming, stains, etc. are involved, but the present invention can be expected to greatly reduce the burden on liquid level control.
【図面の簡単な説明】 第１図は本発明のドラフトチューブ付き気泡塔の構造の
一例を示す斜視図、第２図A,B,C,Dはそれぞれ他の構造
例を示す図、第３図は実施例における通気線速度Ugと酸
素移動容量係数KLaとの関係を示す図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an example of the structure of a bubble column with a draft tube according to the present invention, and FIGS. 2A, B, C and D are views showing other examples of structures, respectively. The figure is a diagram showing the relationship between the air flow velocity Ug and the oxygen transfer capacity coefficient K L a in the examples.
Claims (1)
おいて、該ドラフトチューブの上部に縦方向に分布する
ように縦方向の長さがドラフトチューブ全長に対して1/
2以下であり、開孔部における開孔率が20〜50％の範囲
である開孔部が設けられていることを特徴とするドラフ
トチューブ付き気泡塔。1. In a bubble column in which a draft tube is provided in the column, the length in the vertical direction is 1 / the total length of the draft tube so as to be distributed vertically in the upper part of the draft tube.
A bubble column with a draft tube, characterized in that the bubble column with a draft tube is provided with an aperture ratio of 2 or less and an aperture ratio in the aperture of 20 to 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63192611A JPH0716395B2 (en) | 1988-08-03 | 1988-08-03 | Bubble tower with draft tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63192611A JPH0716395B2 (en) | 1988-08-03 | 1988-08-03 | Bubble tower with draft tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0242971A JPH0242971A (en) | 1990-02-13 |
| JPH0716395B2 true JPH0716395B2 (en) | 1995-03-01 |
Family
ID=16294140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63192611A Expired - Fee Related JPH0716395B2 (en) | 1988-08-03 | 1988-08-03 | Bubble tower with draft tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0716395B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003023306A1 (en) * | 2001-09-06 | 2003-03-20 | Kyowa Hakko Kogyo Co., Ltd. | Draft tube and air bubble tower |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4634675A (en) * | 1983-12-29 | 1987-01-06 | New Brunswick Scientific Co., Inc. | Agitator for a fermentation and tissue culturing vessel |
-
1988
- 1988-08-03 JP JP63192611A patent/JPH0716395B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0242971A (en) | 1990-02-13 |
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