JPH0242971A - Bubble tower provided with draft tube - Google Patents
Bubble tower provided with draft tubeInfo
- Publication number
- JPH0242971A JPH0242971A JP63192611A JP19261188A JPH0242971A JP H0242971 A JPH0242971 A JP H0242971A JP 63192611 A JP63192611 A JP 63192611A JP 19261188 A JP19261188 A JP 19261188A JP H0242971 A JPH0242971 A JP H0242971A
- Authority
- JP
- Japan
- Prior art keywords
- draft tube
- liquid
- liquid level
- draft
- bubble tower
- 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.)
- Granted
Links
- 239000007788 liquid Substances 0.000 abstract description 38
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 7
- 239000001301 oxygen Substances 0.000 abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 abstract description 4
- 230000000813 microbial effect Effects 0.000 abstract description 3
- 239000007791 liquid phase Substances 0.000 abstract description 2
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
Abstract
Description
【発明の詳細な説明】
の１
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] (1) Recently, bubble columns with draft tubes are being adopted for liquid phase oxidation, microbial reactions, etc. One of the disadvantages of this bubble column with a draft tube is that the liquid level must always be maintained above the level of the top 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 (decrease) due to evaporation of the liquid due to aeration or operations such as fed-batch culture.
There are things 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, accurate detection and control of the liquid level in the bubble column during operation has been considered difficult, especially when accompanied by foaming, fouling, etc.
Liquid level control has been a major burden on bubble column operation.
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 any trouble even in response to such a drop in liquid level.
皿迷ｎ支里
描出らは、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 ａｌ、、 Ｊ、 Ｆｅｒｍｅｎｔ、 Ｔｅｃ
ｈｎｏｌ、。Saramai, Shiri, and others have proposed a system in which divided draft tubes are connected vertically, and a perforated plate is installed horizontally at one place above each stage of draft tubes. [Fukuda
H, et al., J. Ferment, Tec.
hnol,.
■、 ｐ、６１９ ｆ１９７８１］
また金石らは、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；ｐ、１６３ （１９７
３１］
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なり、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, p. 619 f19781] Kaneishi et al. also proposed adding a perforated plate to each stage of the draft tube, making the total number of perforated plates three. [Collection of lecture abstracts from the Japan Society for Fermentation; p, 163 (197
[31] However, in these methods, if the liquid level is not located exactly at the opening between the draft tubes of each stage, the circulation of gas and liquid between the inside and outside of the draft tubes is inhibited, and the inside of the inner cylinder is Gas-liquid contact occurs only in this case, and the performance as a bubble column deteriorates (oxygen transfer capacity coefficient KLa decreases).
do.
が しよ と る
本発明は、液レベルの任意の変動に対しても支障な（運
転できるドラフトチューブ材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 draft tube material that can be operated unimpeded by any fluctuations in liquid level.
を するための
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開孔部が設けられて
いることを特徴とする。The bubble column with a draft tube of the present invention for the purpose of shall be.
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−である。An example of a bubble column having such a structure is explained with reference to FIG. 1. A cylindrical draft tube 2 is provided inside the column 1, and a plurality of openings distributed in the vertical direction are provided in the upper part of the draft tube 2. 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討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図りに示すようにドラ
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 openings distributed in the vertical direction are not limited to the slit-like ones shown enlarged in Fig. 1 and Part 2C, but as shown in Fig. 2A, Select as appropriate, such as one with a large number of draft tubes provided in the circumferential direction, one with a plurality of inverted triangular notches 5 as shown in Figure 2B, and one with a wire mesh 6 at the top of the draft tube as shown in the second diagram. and can be hired.
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 lowest end of the openings distributed vertically in the upper part of the draft tube is at the lowest expected liquid level, or at a liquid level that cannot function as a bubble column if it drops further. Although they can be determined together, it is preferable that the length of the aperture in the vertical direction is 1/2 or less of the overall length of the draft tube, and the porosity of the aperture 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。Four types of draft tubes A and B shown in FIG.
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 C and D, and showing their ranking in terms of size, the results are 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−＝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 against liquid volume fluctuations - = A, C,
D>B Here, type B is slightly disadvantageous because the effective cross-sectional area for the liquid to move in the radial direction is narrow, especially when the liquid decreases to near the lower end of the draft tube opening. in the end,
All four types of draft tubes from A to D are effective, but considering both of the above two items (1) and (2), type C or type D is considered to be 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 the upper part of a solid straight pipe (plate), which is the draft tube material, to form an opening in a circular, rectangular, triangular, etc. shape.
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 previously manufactured 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 mesh) may be connected to the upper part of the draft tube. .
■
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。■ Even if the liquid level in the bubble column falls below the upper edge of the draft tube, the gas and liquid will flow inside and outside the draft tube through the openings provided in the upper part of the draft tube so that the liquid is distributed vertically. Since the liquid circulates without any problem, the same KLa (oxygen transfer capacity coefficient) as when the liquid level is high can be maintained.
支立泗
第１図に示した構造の、径１７２ｍｍφ、全長１５０ｃ
ｍ、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、塔底かも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。Support beam: Diameter 172mmφ, total length 150c, with the structure shown in Figure 1.
m, a draft tube with 6 vertical slits (width 30 mm, length 400 mm) at the top (distance between slits 60 mm) is placed inside a bubble column with a column diameter of 250 mmφ, and the height is from the bottom of the column to the lower end of the slits. The oxygen transfer capacity coefficient KLa was measured by changing the liquid level and ventilation amount.
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。但し
測定前に予めＤｏ値零及び飽和値を調整しておいた。The measurement of KLa was carried out by installing a Do meter (dissolved oxygen meter) sensor at a predetermined position in the tower and using the following procedure. However, 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 air flow rate to the specified value while watching the reading on the rotameter.
■バルブ切換えにより空気から窒素に流路を変える。■Change the flow path 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がら空気に
変える。■When the Do in the tower drops to near zero, change from nitrogen to air again.
■塔内のＤＯ値の経時変化をデータロガ−およびペンレ
コーダーに記録する。(2) Record the change in DO value in the tower over time on a 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に＋、
ａを表わし、◇印は液深１１０ｃｍ（スリットの下端）
、○印は液深１２１ｃｍ（スリットの下端とスリットの
中央との間）、Δ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）の
時のデータである。The measurement results are shown in Figure 3. In Figure 3, the horizontal axis is the ventilation linear velocity Ug (cm/s), and the vertical axis is the oxygen transfer capacity coefficient +,
◇ indicates liquid depth 110cm (lower end of slit)
, ○ marks are data when the liquid depth is 121 cm (between the lower end of the slit and the center of the slit), Δ marks are the liquid depth 130 cm (the center of the slit), and marks are data when the liquid depth is 153 cm (the 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 when the liquid level gradually decreases and finally reaches the lower end of the opening (slit), it still shows almost the same KLa as when the liquid level is high. is clear.
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。In other words, it was found that the draft tube of the present invention exhibits almost the same KLa for the same ventilation amount without depending on the liquid level even when the liquid amount fluctuates over a fairly wide range, which proves the effectiveness of the present invention. Proven.
免豆二突】
気泡塔内液量が減少しても、所定の範囲内であれば塔内
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。Even if the amount of liquid in the bubble column decreases, it will not impede the liquid circulation, mass transfer, and reaction (chemical reaction or microbial reaction) within the column, as long as it is within the specified 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−が増す。Therefore, there is no need to strictly control the liquid level during operation, and scale down due to plan changes can be dealt with, increasing operational flexibility.
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 has been considered particularly difficult when accompanied by foaming, contamination, etc., but the present invention can be expected to significantly reduce the burden on liquid level control.
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に＋、ａとの関
係を示す図である。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 FIG. 2 A, B, and C. D is a diagram showing other structural examples, and FIG. 3 is a diagram showing the relationship between the ventilation linear velocity Ug and the oxygen transfer capacity coefficient + and a in the example.
Claims (1)
ラフトチューブの上部に縦方向に分布するように開孔部
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. A bubble column equipped with a draft tube, characterized in that the bubble column has a draft tube provided in the column, wherein openings are provided in the upper part of the draft tube so as to be distributed in the vertical direction.
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 true JPH0242971A (en) | 1990-02-13 |
| JPH0716395B2 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) |
Cited By (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 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60160882A (en) * | 1983-12-29 | 1985-08-22 | ニユ− ブランズウイツク サイエンテイフイツク カンパニ−，インコ−ポレ−テツド | Stirrer suitable for fermentation and tissue culture container |
-
1988
- 1988-08-03 JP JP63192611A patent/JPH0716395B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60160882A (en) * | 1983-12-29 | 1985-08-22 | ニユ− ブランズウイツク サイエンテイフイツク カンパニ−，インコ−ポレ−テツド | Stirrer suitable for fermentation and tissue culture container |
Cited By (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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0716395B2 (en) | 1995-03-01 |
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