JPH04281872A - Method for controlling diameter of liquid drop of pressurized two-fluid nozzle - Google Patents
Method for controlling diameter of liquid drop of pressurized two-fluid nozzleInfo
- Publication number
- JPH04281872A JPH04281872A JP7235391A JP7235391A JPH04281872A JP H04281872 A JPH04281872 A JP H04281872A JP 7235391 A JP7235391 A JP 7235391A JP 7235391 A JP7235391 A JP 7235391A JP H04281872 A JPH04281872 A JP H04281872A
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- pressurized
- pressure
- liquid
- diameter
- 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 title claims abstract description 35
- 239000012530 fluid Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 7
- 239000007921 spray Substances 0.000 claims description 12
- 238000004033 diameter control Methods 0.000 claims 1
- 238000007664 blowing Methods 0.000 abstract description 7
- 238000007796 conventional method Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000000889 atomisation Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000011550 stock solution Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 101000582320 Homo sapiens Neurogenic differentiation factor 6 Proteins 0.000 description 1
- 102100030589 Neurogenic differentiation factor 6 Human genes 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002356 laser light scattering Methods 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Nozzles (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、スプレードライヤー装
置などに組み込む加圧二流体ノズルの液滴径制御法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling droplet diameter of a pressurized two-fluid nozzle incorporated into a spray dryer or the like.
【０００２】0002
【従来の技術】スプレードライヤーには、従来から、回
転ディスク（回転円盤）、二流体微粒噴ノズル、加圧旋
回ノズルを使用している。回転ディスクは粒径変更、水
と原液噴霧切換え、処理量変更が容易であるが、高速回
転機を必要とし、保守が容易ではない。二流体微粒噴ノ
ズルは、いわゆる霧吹きタイプのもので、高速の空気流
で原液を噴霧化するが、高圧の空気が多量に必要であり
、運転費が高くなる難点がある。そのため、できるだけ
加圧旋回ノズルを使用するのが一般的である。2. Description of the Related Art Spray dryers have conventionally used a rotating disk, a two-fluid fine particle injection nozzle, and a pressurized swirl nozzle. Rotating disks make it easy to change the particle size, switch between water and undiluted solution spraying, and change the throughput, but they require a high-speed rotating machine and are difficult to maintain. The two-fluid fine droplet spray nozzle is a so-called atomizing type that atomizes the stock solution with a high-speed air stream, but it requires a large amount of high-pressure air and has the disadvantage of high operating costs. Therefore, it is common to use pressurized swirl nozzles as much as possible.
【０００３】加圧旋回ノズルは、加圧した液体に旋回を
与え、オリフィスから液を薄膜で形成された円錐環（Ｈ
ｏｌｌｏｗ ｃｏｎｅ）状に噴出させ、この円錐環の
先端縁部において空気と相互作用により液膜が乱れ、分
裂し、微粒を形成するものである。加圧旋回ノズルでは
、液体に加える圧力の大小により、噴霧の液滴径を調整
するが、圧力を変化させると液流量が変化するため、ノ
ズル部品の組み合わせと噴霧圧力の調整とを行うことに
より、液流量を一定に保ち、液滴径の制御を行っている
。A pressurized swirl nozzle swirls pressurized liquid and directs the liquid from an orifice through a conical ring (H) formed of a thin film.
The liquid film is ejected in the form of a hollow cone, and the liquid film is disturbed and split due to interaction with air at the tip edge of the conical ring, forming fine particles. With a pressurized swirl nozzle, the droplet diameter of the spray is adjusted by changing the pressure applied to the liquid, but since changing the pressure changes the liquid flow rate, it is necessary to combine the nozzle parts and adjust the spray pressure. , the droplet diameter is controlled by keeping the liquid flow rate constant.
【０００４】0004
【発明が解決しようとする課題】しかしながら、この調
整方法は、多数のノズル部品が必要であり、かつ連続的
に部品を作ることは不可能であると共に、ノズル部品の
選定に熟練とノウハウを必要とした。また、液の粘度、
濃度、表面張力等が運転中に変化することがあり、ノズ
ル部品の交換のため、一旦運転を停止させねばならなか
った。本発明は、従来のこのような問題点に鑑みなされ
たものであり、ノズル部品の交換を要せず、液流量、液
圧力を一定に保ったまま、液滴径を連続的に調整・制御
することができる制御法を提供することをその目的とす
るものである。[Problems to be Solved by the Invention] However, this adjustment method requires a large number of nozzle parts, it is impossible to make parts continuously, and skill and know-how are required to select the nozzle parts. And so. Also, the viscosity of the liquid,
Concentration, surface tension, etc. may change during operation, and operation had to be temporarily stopped in order to replace nozzle parts. The present invention was developed in view of these conventional problems, and allows for continuous adjustment and control of the droplet diameter while keeping the liquid flow rate and liquid pressure constant without the need to replace nozzle parts. The purpose is to provide a control method that can
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、液加圧吹出しのための圧力旋回ノズルと
、該圧力旋回ノズルの周りに設けた高速ガス吹出し用筒
状体とからなり、その先端部を先細り構造とした加圧二
流体ノズルにおいて、吹出し高速ガスの流速を調節する
ことによって、形成される噴霧の液滴径を制御すること
を特徴とする加圧二流体ノズルにおける液滴径制御法を
提供するものである。[Means for Solving the Problems] In order to achieve the above object, the present invention provides a pressure swirl nozzle for blowing out liquid under pressure, and a cylindrical body for high-speed gas blowing provided around the pressure swirl nozzle. A pressurized two-fluid nozzle consisting of a pressurized two-fluid nozzle whose tip end has a tapered structure, and the droplet diameter of the spray formed is controlled by adjusting the flow rate of the blown high-speed gas. The present invention provides a method for controlling the droplet size in the present invention.
【０００６】[0006]
【作用】本発明の加圧二流体ノズルは、加圧旋回ノズル
を改良したものであるため、基本的には加圧旋回ノズル
の性能を有する。加圧旋回ノズルに適用される噴霧特性
に関する実験式（数１、数２）は、次の通りである。[Operation] The pressurized two-fluid nozzle of the present invention is an improved version of the pressurized swirl nozzle, and therefore basically has the performance of the pressurized swirl nozzle. The empirical formulas (Equation 1 and Equation 2) regarding the spray characteristics applied to the pressurized swirl nozzle are as follows.
【０００７】[0007]
【数１】[Math 1]
【数２】[Math 2]
【０００８】数１および数２より明らかなように、噴霧
圧力Ｐが決まれば、液滴径ＤＤ と液流量Ｗは一義的に
決まるが、液圧力Ｐが低下すると液流量Ｗはこれに比例
して減少し、液滴径ＤＤ は反比例して大となる。この
大となった液滴径を高速ガス流によって更に微粒化する
のである。As is clear from Equations 1 and 2, once the spray pressure P is determined, the droplet diameter DD and the liquid flow rate W are uniquely determined, but when the liquid pressure P decreases, the liquid flow rate W becomes proportional to this. The droplet diameter DD increases inversely. This increased droplet diameter is further reduced to fine particles by a high-speed gas flow.
【０００９】すなわち、加圧二流体ノズルには、２つの
微粒化段階があり、先ず初期条件設定のため、加圧旋回
ノズルの液自身のもつ圧力で一次微粒化をさせる。この
とき、上記数式１および２が適用される。加圧二流体ノ
ズルのオリフィスから液が円錐環状に噴射される一次微
粒化の状況は、図３に示す通りである。That is, the pressurized two-fluid nozzle has two stages of atomization. First, in order to set initial conditions, primary atomization is performed using the pressure of the liquid itself in the pressurized swirl nozzle. At this time, Equations 1 and 2 above are applied. The situation of primary atomization in which liquid is injected in a conical ring shape from the orifice of the pressurized two-fluid nozzle is as shown in FIG.
【００１０】次に、本発明では、一次微粒化された液滴
に対して、吹出し用筒状体の先端から吹出した高速ガス
を集中的に衝突させて二次微粒化する。しかして、液圧
力Ｐが低下し、液滴径ＤＤ が大となったものでも、こ
の作用によって微粒化することが可能となる。[0010] Next, in the present invention, the primary atomized droplets are collided intensively with high-speed gas blown from the tip of the blowing cylindrical body to form secondary atomization. Therefore, even if the liquid pressure P decreases and the droplet diameter DD becomes large, it becomes possible to atomize the liquid by this action.
【００１１】[0011]
【実施例】以下、本発明を図示の実施例に基づいて更に
詳細に説明するが、本発明はこれらの実施例に限定され
るものではない。図１は、本発明の加圧二流体ノズルの
一例を示す断面説明図、図２は、図１の加圧二流体ノズ
ルの先端部を示す部分断面説明図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in more detail below based on illustrated embodiments, but the present invention is not limited to these embodiments. FIG. 1 is an explanatory cross-sectional view showing an example of the pressurized two-fluid nozzle of the present invention, and FIG. 2 is a partial cross-sectional explanatory view showing the tip of the pressurized two-fluid nozzle of FIG.
【００１２】図１、図２の加圧二流体ノズルは、先端部
に加圧旋回ノズル６を有する液パイプ５の周りに、ジャ
ケットパイプ３を設け、かつジャケットパイプ３はその
先端部がしぼられて先細り構造となっているものである
。尚、図中、１は液ポンプ、２はルーツブロワー、４は
エアーノズルを夫々示す。In the pressurized two-fluid nozzle shown in FIGS. 1 and 2, a jacket pipe 3 is provided around a liquid pipe 5 having a pressurizing swirl nozzle 6 at its tip, and the jacket pipe 3 has a constricted tip. It has a tapered structure. In the figure, 1 indicates a liquid pump, 2 indicates a Roots blower, and 4 indicates an air nozzle.
【００１３】このように、加圧二流体ノズルにおけるジ
ャケットパイプ３の先端開口部の断面積は小さいので、
この開口部のエアーノズル４で高速ガスは加速・膨張さ
れる。このガスの加速・膨張作用により、圧力旋回ノズ
ル６の先端中央に設けられたオリフィスから円錐環状に
旋回して押し出された薄膜の一次微粒化液は、更に二次
微粒化（二次噴霧化）されることになる。ここで、二次
噴霧の液滴径とガス流速との間に相関があることは前述
したとおりである。[0013] As described above, since the cross-sectional area of the tip opening of the jacket pipe 3 in the pressurized two-fluid nozzle is small,
The high-speed gas is accelerated and expanded by the air nozzle 4 in this opening. Due to the acceleration and expansion of this gas, the primary atomized liquid in the thin film that is extruded from the orifice provided at the center of the tip of the pressure swirl nozzle 6 in a conical ring shape is further transformed into secondary atomization (secondary atomization). will be done. Here, as described above, there is a correlation between the droplet diameter of the secondary spray and the gas flow rate.
【００１４】以下、具体的な実験例を示す。
（実験例１）液圧力一定の状態で、ガス流速と液滴径の
関係を実験的に確認した。実験に際しては、加圧旋回ノ
ズルとしてスプレーイングシステム社製ＳＸノズルを使
用し、液には常温の水を、ガスとしては常温の空気で夫
々用い、加圧旋回ノズル６内の水の圧力を３ｋｇ／ｃｍ
２ 一定に保ち、ジャケットパイプ３内の空気圧を変化
させることによって吹出し空気の流速を変化させ、空気
流速と噴霧の平均水滴径を測定した。水滴径の測定には
、レーザ光散乱方式による粒度分布測定器（東日コンピ
ュータ社製、ＬＤＳＡ−１３００Ａ型）を使用した。実
験に使用した条件を表１に示す[0014] Specific experimental examples will be shown below. (Experimental Example 1) The relationship between gas flow rate and droplet diameter was experimentally confirmed under a constant liquid pressure condition. During the experiment, an SX nozzle manufactured by Spraying System Co., Ltd. was used as the pressurized swirl nozzle, room-temperature water was used as the liquid, and room-temperature air was used as the gas, and the water pressure in the pressurized swirl nozzle 6 was set at 3 kg. /cm
2. The flow rate of the blown air was varied by changing the air pressure inside the jacket pipe 3 while keeping it constant, and the air flow rate and the average water droplet diameter of the spray were measured. A particle size distribution analyzer using a laser light scattering method (manufactured by Tohnichi Computer Co., Ltd., model LDSA-1300A) was used to measure the water droplet diameter. Table 1 shows the conditions used in the experiment.
【００１５】[0015]
【表１】
また、空気流速と噴霧の平均水滴径の測定結果を表２に
示す。[Table 1] Table 2 also shows the measurement results of the air flow velocity and the average water droplet diameter of the spray.
【００１６】[0016]
【表２】[Table 2]
【００１７】以上から明らかな通り、空気流速を増すこ
とによって平均水滴径が減少している傾向を、上記測定
結果から読みとることができる。さらに、この表２には
示していないが、吹出し空気流速を２０〜２００ｍ／ｓ
の範囲で調節することにより、またジャケットパイプ３
内の空気圧を０．０５〜５ｋｇ／ｃｍ２ の範囲で調節
することにより、共に噴霧の水滴径を制御することがで
きることが確認されたが、これらに限られるものではな
く、ノズル構造の如何により上記数値範囲外で用いても
よい。As is clear from the above, it can be seen from the above measurement results that the average water droplet diameter tends to decrease as the air flow rate increases. Furthermore, although it is not shown in this Table 2, the blowing air flow velocity is 20 to 200 m/s.
By adjusting within the range of , the jacket pipe 3
It was confirmed that the water droplet diameter of the spray can be controlled by adjusting the air pressure within the range of 0.05 to 5 kg/cm2, but the above is not limited to this, depending on the nozzle structure. It may be used outside the numerical range.
【００１８】（実験例２）液として天然多糖類を溶解し
た液を用い、噴霧乾燥テストを行なった。この時の吹出
し空気のない加圧旋回ノズル単独を使用した場合と、加
圧二流体ノズルにより更に微粒化した場合の比較を、表
３に示す。(Experimental Example 2) A spray drying test was conducted using a solution in which a natural polysaccharide was dissolved. Table 3 shows a comparison between the case where a pressurized swirling nozzle without blowing air was used alone and the case where the particles were further atomized using a pressurized two-fluid nozzle.
【００１９】[0019]
【表３】[Table 3]
【００２０】（実験例３）圧力旋回ノズルのオリフィス
径が４．０ｍｍの大容量ノズルを有する加圧二流体ノズ
ルを用いて、低圧の原液噴霧を行ない、目的の小液滴径
を得ることができた。エアーノズル径は２３ｍｍである
。そのときの計測結果を表４に示す。(Experimental Example 3) Using a pressurized two-fluid nozzle having a large capacity nozzle with an orifice diameter of 4.0 mm, low-pressure stock solution spraying was performed to obtain the desired small droplet diameter. did it. The air nozzle diameter is 23 mm. Table 4 shows the measurement results at that time.
【００２１】[0021]
【表４】[Table 4]
【００２２】[0022]
【発明の効果】以上説明したように、本発明によれば、
従来の圧力旋回ノズル内の液圧調節による噴霧液滴径制
御法に比し、多数のノズル部品を必要とせず、ノズル部
品組合わせの選定にノウハウも必要とせず、ノズル部品
交換のための一時運転停止の必要もなく液滴径の制御が
できるので、必要な製品粒径を得ることができ、多品種
に対応することができる。[Effects of the Invention] As explained above, according to the present invention,
Compared to the conventional method of controlling atomized droplet diameter by adjusting the liquid pressure in a pressure-swivel nozzle, it does not require a large number of nozzle parts, no know-how is required to select a combination of nozzle parts, and there is no need to temporarily replace nozzle parts. Since the droplet size can be controlled without the need to stop operation, the required product particle size can be obtained and a wide variety of products can be handled.
【図１】本発明の加圧二流体ノズルの一例を示す断面説
明図である。FIG. 1 is an explanatory cross-sectional view showing an example of a pressurized two-fluid nozzle of the present invention.
【図２】図１のノズル装置の先端部を示す部分断面説明
図である。FIG. 2 is an explanatory partial cross-sectional view showing the tip of the nozzle device in FIG. 1;
【図３】加圧旋回ノズルから液が円錐環状に噴射される
一次微粒化の状況を示す説明図である。FIG. 3 is an explanatory diagram showing a state of primary atomization in which liquid is injected in a conical ring shape from a pressurized swirl nozzle.
１ 液ポンプ ２ ルーツブロアー ３ ジャケットパイプ ４ エアーノズル ５ 液パイプ ６ 圧力旋回ノズル 1 Liquid pump 2 Roots blower 3 Jacket pipe 4 Air nozzle 5 Liquid pipe 6 Pressure swirl nozzle
Claims (1)
と、該圧力旋回ノズルの周りに設けた高速ガス吹出し用
筒状体とからなり、その先端部を先細り構造とした加圧
二流体ノズルにおいて、吹出し高速ガスの流速を調節す
ることによって、形成される噴霧の液滴径を制御するこ
とを特徴とする加圧二流体ノズルにおける液滴径制御法
。Claim 1: A pressurized two-fluid nozzle consisting of a pressure swirl nozzle for pressurized liquid blowout and a cylindrical body for high-speed gas blowout provided around the pressure swirl nozzle, the tip of which has a tapered structure. A droplet diameter control method in a pressurized two-fluid nozzle, characterized in that the droplet diameter of the spray formed is controlled by adjusting the flow rate of high-speed gas blown out.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3072353A JP3034974B2 (en) | 1991-03-12 | 1991-03-12 | Droplet diameter control method for pressurized two-fluid nozzle |
| KR1019910007011A KR0159947B1 (en) | 1991-03-12 | 1991-04-30 | Two-fluid pressure nozzle of upward injection type spray dryer using the nozzle and method for control of droplet diameter in the nozzle |
| US07/725,104 US5272820A (en) | 1991-03-12 | 1991-07-03 | Two-fluid pressure nozzle of upward injection type, spray dryer using the nozzle, and method for control of droplet diameter in the nozzle |
| EP91306648A EP0503187B1 (en) | 1991-03-12 | 1991-07-22 | Two-fluid pressure nozzle of upward injection type |
| DE69113018T DE69113018T2 (en) | 1991-03-12 | 1991-07-22 | Two-phase pressure nozzle for upward spraying. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3072353A JP3034974B2 (en) | 1991-03-12 | 1991-03-12 | Droplet diameter control method for pressurized two-fluid nozzle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04281872A true JPH04281872A (en) | 1992-10-07 |
| JP3034974B2 JP3034974B2 (en) | 2000-04-17 |
Family
ID=13486868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3072353A Expired - Fee Related JP3034974B2 (en) | 1991-03-12 | 1991-03-12 | Droplet diameter control method for pressurized two-fluid nozzle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3034974B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014017511A1 (en) * | 2012-07-27 | 2014-01-30 | 株式会社パウダリングジャパン | Liquid-atomizing device and liquid-atomizing method |
| JP2018143944A (en) * | 2017-03-03 | 2018-09-20 | 株式会社プリス | Spray dryer |
| CN112601596A (en) * | 2017-03-12 | 2021-04-02 | 塔夫力特塑料有限公司 | Autonomous controlled self-cleaning filter apparatus |
-
1991
- 1991-03-12 JP JP3072353A patent/JP3034974B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014017511A1 (en) * | 2012-07-27 | 2014-01-30 | 株式会社パウダリングジャパン | Liquid-atomizing device and liquid-atomizing method |
| JPWO2014017511A1 (en) * | 2012-07-27 | 2016-07-11 | 株式会社パウダリングジャパン | Fluid atomization apparatus and fluid atomization method |
| JP2018143944A (en) * | 2017-03-03 | 2018-09-20 | 株式会社プリス | Spray dryer |
| CN112601596A (en) * | 2017-03-12 | 2021-04-02 | 塔夫力特塑料有限公司 | Autonomous controlled self-cleaning filter apparatus |
| CN112601596B (en) * | 2017-03-12 | 2022-11-04 | 塔夫力特塑料有限公司 | Autonomous controlled self-cleaning filter apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3034974B2 (en) | 2000-04-17 |
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