JP4718811B2 - Method for making liquid into fine particles and nozzle used therefor - Google Patents

Description

  The present invention relates to a method for turning liquid into fine particles and a nozzle used therefor.

  Nozzles that make liquid fine particles are used in various applications. For example, water, binder, and other additives are added to the fine powder raw material to form a fine particle suspension (slurry), solution or slurry, and the solution or slurry is sprayed into the furnace using a nozzle and dispersed in hot air. There is a spray-drying method that instantly dries and solidifies. According to this method, operations such as filtration, separation, and mechanical concentration required for other drying methods can be omitted, and in many cases, spherical particles of 10 to 500 μm can be obtained. Also, the drying time is from a few seconds to 30 seconds, and since it is less susceptible to thermal denaturation, the dry product shape requires granular powder, the heat sensitive one, the state that is viscous during concentration and drying Suitable for material processing that passes through.

  In recent years, there has been a demand to obtain fine particles having an average particle diameter smaller than 10 μm, such as electronic component materials, battery materials, pharmaceuticals, and fine chemical materials, by spray drying. This includes a two-fluid nozzle as shown in FIG. Is generally used.

  Further, a method and a nozzle are disclosed in which pressurized air is sprayed onto two different types of thinned liquids and sprayed onto finer particles with a large throughput (see Patent Document 1). The nozzle (see FIG. 6) is mainly used as a nozzle that makes the liquid for spray drying as described above fine particles.

  The mechanism for atomizing the liquid in the nozzle described in Patent Document 1 is as follows. That is, the liquids supplied from the liquid flow paths 15 are each stretched to form separate thin film flows 19, and each move on the smooth surface 17 toward the edge 35. Even when the thin film flow 19 leaves the edge 35 and the thin film flows 19 merge once and then changes into fine particles, it can be reduced to 10 μm or less if the gas-liquid ratio is increased. However, since the thin film flow stretched to a predetermined thickness is merged at the tip of the edge, the thickness becomes a predetermined thickness or more. That is, since the part of the process required to make the liquid into a thin film flow is useless, a large amount of pressurized air is required compared to the amount of liquid to be atomized, etc. Had problems in terms of In addition, when the viscosity increases due to mixing / reaction of the two liquids, there is a problem that the atomization performance is lowered.

  Now, other nozzles for turning liquid into fine particles include those shown in FIGS. 7 and 8 (see Non-Patent Document 1). The nozzle shown in FIG. 7 pressurizes the liquid and supplies it to the cylindrical gas flow path 1, mixes it with air in the gas flow path 1, and then ejects it from the tip to form droplets 2. The ejected droplets 2 collide with each other to become fine particles 3 (see Non-Patent Document 1). The nozzle having such a structure can make the liquid fine particles having a size of 10 μm or less, and is said to be most excellent in practical use in forming a very small amount of liquid droplets (less than 10 μm).

  On the other hand, the nozzle shown in FIG. 8 has a double tube structure, and ejects liquid from the center hole 4 and pressurized air from the periphery of the liquid. The nozzle having such a structure has a mechanism in which the liquid ejected from the center is scraped into the surrounding air to form small droplets. In both nozzles, the liquid sprayed with pressurized air It can be made into fine droplets.

  However, when the nozzle shown in FIG. 7 is used for a liquid having a relatively strong adhesion, the droplet sprayed on the nozzle tip adheres and dries when used for several minutes, and this gradually accumulates and clogs the nozzle. There was a problem of waking up. Therefore, it cannot be used for the purpose of atomizing an adherent liquid or a liquid in a state in which a solute is dissolved. It is relatively weakly adhering like water and is used for atomizing only a pure solvent. Therefore, it was impossible to use as a spray drying nozzle.

  In the nozzle shown in FIG. 8, when the center hole 4 is thickened, the droplets ejected are increased accordingly. For this reason, in order to make the droplets into fine particles, it is necessary to make the central hole 4 very small and eject the liquid very finely. Therefore, in order to make the droplets small, it is necessary to make the spray amount per hour extremely small, and the processing amount and the micronization of the droplets are mutually contradictory characteristics, and both characteristics cannot be satisfied at the same time. In addition to the drawbacks, there is a problem that the processing capacity per bottle is small when employed for spray drying and the like. In addition, it is thought that it is the method and nozzle described in the cited document 1 shown in FIG. 6 that a thin liquid thread is made into a thin liquid film on the same principle as the nozzle shown in FIG.

  Further, in the case of the nozzle shown in FIG. 8, the shaving by air gradually proceeds to the central part of the liquid, but the liquid jetted to the central part where the speed of the air gradually decreases and the droplets become larger. Has a problem in that surrounding droplets obstruct the mixing condition with air and the droplets become large.

  In any case, the nozzles as shown in FIGS. 7 and 8 are ejected with a full cone and never with a holocone. A nozzle that makes liquid a very small fine particle is often used for quick drying of a droplet ejected into the air or vaporizing it into the air. At this time, it is preferable that the liquid is ejected by a holo cone. This is because full cone droplets are filled with droplets, and it is difficult to quickly dry the droplets in the central portion or to vaporize them in the air.

  Therefore, the nozzles as shown in FIGS. 7 and 8 have excellent characteristics as a mechanism for turning liquid into fine particles, but cannot be used as spray drying nozzles for the reasons described above. Further, although the nozzle as shown in FIG. 6 is improved, since it requires a large amount of spray gas, it cannot be said that the nozzle has a sufficient atomization efficiency. In addition, the full cone here is a state in which the liquid droplets ejected in a cylindrical shape are filled up to the inside, and the hollow cone (ring shape) is a liquid droplet ejected in a cylindrical shape up to the inside. It is a state that is not full.

  In order to solve the above problems, as shown in FIG. 9 or FIG. 10 (a), one or more liquid supply ports 22 and gas supply ports 18 are installed, and the gas-liquid flow path 21 having a smooth surface, liquid Two liquid channels 15 communicating with the supply port 22 and two gas channels 21 communicating with the gas supply port 18 are installed independently of each other. The liquid channel 15 includes the gas channel 16 and the smooth surface. A nozzle in which the gas-liquid channel 21 is arranged so that the gas-liquid channel 21 is opened and the extension lines extending from the respective smooth surfaces intersect is developed. (See Patent Document 2).

  Since the nozzle shown above has a structure for injecting a thin-film liquid into the air, problems such as clogging of the nozzle hardly occur, and two jet streams containing droplets are separated from each other by air. In order to make the particles collide with each other in the inside, the amount of pressurized gas used can be reduced, more efficient formation of fine particles can be achieved, and the amount of fine particles per unit time is compared with the conventional nozzle. In comparison with the above, it is possible to supply a plurality of liquids / gases independently, so that it has characteristics suitable as a nozzle used for spray drying.

  Moreover, the nozzle shown above can form a liquid droplet into a microparticle in a holographic state by forming the liquid flow path 15, the gas-liquid flow path 21, and the gas flow path 16 in an annular shape. Since the droplets that are atomized in the hollow cone state can be efficiently dried or vaporized, they can be suitably used as a nozzle for spray drying.

  However, although the nozzle shown in FIG. 9 is suitable as a circular large-capacity nozzle, coarse droplets are generated, and the number of components is large (for example, 14 points including bolts and packing). Not only is the structure complicated, but it is necessary to seal the surface of stainless steel with a sheet-like packing, making it difficult to reduce the size. Further, the nozzle component parts are required to have high dimensional accuracy, and are manufactured by a milling machine. Therefore, the cost is high and it is not suitable as a nozzle for a small amount of processing.

In the case of the nozzles shown in FIGS. 10A to 10C, the liquid flow path 15, the gas-liquid flow path 21, and the gas flow path 16 are formed as straight spray holes, so that the structure is simple. Although it is easy to miniaturize, since it is a straight-shaped spray hole, the spray state at both ends of the spray hole becomes unstable, so boundary conditions at both ends are indispensable.
JP-A-8-281155 JP 2003-117442 A N. Ohnishi et. al. Proceeding of The 4th International Conference on Liquid Atomization and Spray Systems, 57, THE FUEL SOCIETY OF JAPAN (1988)

  The present invention has been made in view of such problems of the prior art, and the object of the present invention is that the droplets are sprayed in an annular shape, so that it is not necessary to set the boundary conditions of the droplets. Yes, its nozzle structure is simple, and it is easy to reduce the size, and the amount of pressurized gas used to make the liquid into fine particles is smaller and more efficiently used. The amount of fine particles per unit time It is an object of the present invention to provide a method for making a liquid into fine particles and a nozzle used therefor.

  In order to achieve the above-mentioned object, the present invention provides a method for making the following liquid into fine particles and a nozzle used therefor.

[1] A first step in which a gas and a liquid pass through a gas flow path and a liquid flow path inside the nozzle and are respectively supplied to a doubly arranged annular slit at the tip of the nozzle, and the liquid The gas is generated from the annular first slit by injecting the gas from the annular second slit disposed outside the first slit to form a high-speed thin film flow, and the second process. The high-speed thin film flow flows along the guide surface of the nozzle, jumps out from the tip of the nozzle, becomes a jet flow, and the jet flow obtained in the third step is used as an external collision point. A fourth step of causing the droplets to atomize by focusing at the external collision point while converging toward the surface, and spraying the fine particles obtained in the fourth step in an annular shape with the external collision point as a vertex. A fifth step of performing a fine particle on the liquid How to.

[2] The method according to [1], wherein the jet stream has a collision angle of 60 to 160 °.

[3] The method according to [1] or [2], wherein the angle formed between the first slit and the second slit is 90 to 160 °.

[4] The method according to any one of [1] to [3], wherein the spray angle of the fine particles from the external collision point is 30 to 150 °.

[5] An outer cap that forms the outer appearance of the nozzle, a swirl vane that is inserted and disposed on the inner surface of the tip of the outer cap, and that imparts a predetermined swirl flow to the gas and has a hollow portion at the center;
Inserted and arranged in the hollow portion of the swirl vane, and formed an annular slit-like gas flow path between the inner end surface of the outer cap and a gas supply path between the inner side surface of the outer cap An annular slit-shaped liquid flow path is formed between the core having a hollow portion at the center and the hollow portion of the core to be inserted and disposed, and the inner surface of the core. A center frame having a liquid supply path communicating with the liquid flow path, and by jetting liquid and gas in an annular shape from the liquid flow path and the gas flow path, The jet stream containing the obtained droplets is focused toward the external collision point, collided at the external collision point, the droplets are made into fine particles, and the obtained fine particles are used with the external collision point as a vertex. The liquid sprayed in a circular shape into fine particles Zur.

[6] The nozzle which makes the liquid fine particles according to [5], in which the jet stream has a collision angle of 60 to 160 °.

[7] The nozzle according to [5] or [6], wherein the angle formed between the liquid channel and the gas channel is 90 to 160 °.

[8] The nozzle for converting the liquid according to any one of [5] to [7], wherein the spray angle of the fine particles from the external collision point is 30 to 150 °.

  The method of making the liquid into fine particles of the present invention and the nozzle used therefor, since the droplets are sprayed in an annular shape, it is not necessary to set the boundary conditions of the droplets, and the nozzle structure is simple and downsized. In addition, the amount of pressurized gas used to make the liquid into fine particles is smaller and more efficiently used, and the amount of fine particles per unit time can be increased.

  As shown in FIG. 1 (a), the liquid and the liquid according to the present invention are arranged so that the gas and the liquid pass through the gas flow path 47 and the liquid flow path 52 inside the nozzle and are doubled at the tip of the nozzle. The first step supplied to each of the annular slits (the first slit 40 and the second slit 42), and the liquid is disposed from the annular first slit 40 and the gas is disposed outside the first slit 40. The second step of jetting from the annular second slit 42 to form a high-speed thin film flow, and the high-speed thin film flow generated by the second step are performed along the guide surface 58 of the nozzle (center frame 56). The third step of jetting, flowing out from the tip of the nozzle and becoming a jet flow, and the jet flow 31 obtained in the third step is focused toward the external collision point 60 as shown in FIG. Collide at external collision point 60 A fourth step of atomizing, those having a fifth step of spraying the fine particles 32 obtained in the fourth step in a circular annular external collision point 60 and apex, the.

  As shown in FIG. 1 (b), the main feature of the method of turning the liquid into fine particles of the present invention is that the jet stream 31 containing droplets converges conically toward the external collision point 60, while external collisions occur. After colliding at a point 60 to form droplets, the particles 32 are sprayed in an annular shape with the external collision point 60 as a vertex. In addition, specifically, the average particle diameter of the obtained fine particles 32 can be appropriately adjusted to about 5 to 15 μm or less (for example, 5 μm or less).

  As a result, in the method of turning the liquid into fine particles according to the present invention, since the droplets are sprayed in an annular shape, setting of the boundary condition of the droplets is not necessary as in the nozzle shown in FIG. Generation of droplets can be prevented.

  In addition, since the method of making the liquid into fine particles of the present invention can simplify the structure of the nozzle, it is easy to reduce the size of the nozzle for small circular processing, and the manufacturing cost can be reduced. For example, as shown in FIG. 3, since the number of nozzle parts is four and the dimensional accuracy of the parts is not so high, it can be manufactured with a lathe and sealed only with an O-ring or seal tape. it can.

  In addition, the method of making the liquid into fine particles of the present invention can reduce the amount of pressurized gas used, can achieve more efficient formation of fine particles, and the amount of fine particles per unit time is a conventional nozzle. In addition to being more than the above, it is also possible to supply a plurality of liquids / gases independently, so that it has characteristics suitable as a nozzle used for spray drying.

  In the method of making the liquid of the present invention fine particles, as shown in FIG. 1A, the collision angle α of the jet stream 31 is preferably 60 to 160 °, more preferably 70 to 150 °. More preferably, the angle is 80 to 140 °. This is because the amount by which the kinetic energy of the jet stream is converted into collision energy is determined by the collision angle.

  Further, in the method of making the liquid into fine particles of the present invention, as shown in FIG. 2B, the angle γ formed by the first slit (liquid slit) and the second slit (gas slit) is 90 to 160 °. It is preferably 100 to 150 °, more preferably 110 to 140 °. This is to avoid a sudden change in the flow of the liquid.

  Furthermore, in the method of turning the liquid of the present invention into fine particles, the spray angle β of the fine particles 32 from the external collision point is preferably 30 to 150 ° as shown in FIG. This is because the tower diameter and tower height of the SD drying tower are determined by the spray angle.

  Next, as shown in FIG. 1A, in the nozzle that makes the liquid of the present invention fine particles, the liquid ejecting portion at the tip of the nozzle is an annular slit (first slit 40). At this time, as shown to Fig.2 (a), it is preferable that the slit width a of the 1st slit 40 is 0.2-1.5 mm, More preferably, it is 0.3-1.0 mm, More preferably Is 0.4 to 0.8 mm (usually 0.5 mm). At this time, as shown in FIG.1 (b), the slit length (annular slit diameter) L of the 1st slit 40 can be changed according to the processing capability of a nozzle.

  In the nozzle of the present invention that makes the liquid fine particles, the slit width a of the first slit 40 is constant as shown in FIG. 2 (a), and the first slit as shown in FIG. 1 (b). By making the slit length (annular slit diameter) L and the ratio of the treatment amount constant, the film thickness at the first slit 40 can be made constant.

  Moreover, the nozzle which makes the gas fine particles of the present invention has an annular slit (second slit 42) at the gas injection portion at the tip of the nozzle. At this time, as shown in FIG. 2B, the slit width b of the second slit 42 is preferably 0.1 to 1 mm, more preferably 0.2 to 0.8 mm, and still more preferably 0. .2 to 0.5 mm. This is because the slit width b of the second slit 42 has a great influence on the amount of atomized air and atomization.

  Furthermore, in the nozzle for making the gas fine particles of the present invention, as shown in FIG. 1A, the liquid forming the thin film flow ejected from the first slit 40 is accelerated by the gas ejected from the second slit 42. When the high-speed thin film flow passes through the guide surface 58, the film state cannot be maintained due to strong turbulence of the gas, and the high-speed air flow containing droplets due to the surface tension is broken. A jet stream 31 is obtained. At this time, as shown in FIG. 2B, the length c of the guide surface is preferably 0 to 5 mm, more preferably 1 to 4 mm, still more preferably 2 to 3 mm (usually 2. 8 mm).

  Hereinafter, with reference to the drawings, the nozzle for converting the liquid of the present invention into fine particles will be described in detail, but the present invention should not be construed as being limited thereto, and without departing from the scope of the present invention. Various changes, modifications and improvements can be made based on the knowledge of those skilled in the art.

  FIG. 3 is a cross-sectional view of an essential part showing an example of a nozzle that makes the liquid of the present invention fine particles, and FIG. 4 is a front view showing an example of a swirl blade that is a member constituting the nozzle that makes the liquid of the present invention fine particles. 5 is a cross-sectional view taken along the line AA in FIG.

  For example, as shown in FIG. 3, the nozzle for turning the liquid into fine particles according to the present invention is inserted and arranged on the inner surface of the outer cap 44 that forms the outer appearance of the nozzle, and the outer end of the outer cap 44. A swirl vane 46 (see FIG. 4) having a hollow portion at the center for imparting a flow and an annular slit-like shape inserted between the hollow portion 46 of the swirl vane 46 and the inner surface of the front end of the outer cap 44 A gas flow path 47 is formed, and a gas supply path 48 is formed between the inner side surface of the outer cap 44. A hollow portion is formed at the center and communicated with a part of the gas supply path 48 on both sides. The annular slit-like liquid flow path 52 is formed between the core 50 having one gas supply port 49 and the hollow portion of the core 50, and the inner surface of the core 50. Communication between the liquid flow path 52 and the liquid supply port 53 And a center frame 56 (see FIG. 5) having a second gas supply port 55 communicating with the first gas supply port 49 on both sides. .

  In other words, the nozzle for converting the liquid into fine particles according to the present invention allows liquid and gas to flow from the liquid channel 52 and the gas channel 47 (first slit 40 and second slit 42 as shown in FIGS. 1A and 1B). The liquid jet is jetted in an annular shape and gas-liquid mixing is performed to cause the jet stream 31 containing droplets to collide at the external collision point 60 while converging in a conical shape toward the external collision point 60. By adopting a method of spraying the fine particles 32 in an annular shape with the external collision point 60 as the apex after making the droplets into fine particles, for example, as shown in FIG. 3, the outer cap 44, the swirl vane 46, and the core 50 are used. The center frame 56 can be formed of a simple structure member.

  Thereby, the nozzle which makes the liquid of this invention microparticles | fine-particles can reduce manufacturing cost, and can also perform maintenance management and adjustment of the spray angle of microparticles | fine-particles easily.

  For example, in the nozzle for converting the liquid into fine particles of the present invention, the adjustment of the spray angle of the fine particles can be realized only by replacing the outer cap 44 having a taper suitable for each spray angle.

  Further, as shown in FIG. 3, the swirl vane 46 used in the present invention gives a swirl flow to the gas supplied from the gas supply path 48. For example, as shown in FIG. When the swirl angle δ is 15 to 60 °, the spray gas can be blown out uniformly by swirling. On the other hand, if turning is too strong, atomization efficiency will become low.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited to these Examples.

(Examples 1-3)
The nozzle (nozzle type SJ-10) shown in FIG. 3 is sprayed with water under the conditions shown in Tables 1 to 3, and the droplet diameter is measured by a laser light scattering type particle size distribution measuring apparatus (model: LDSA / 1400A [Tohnichi Computer). Application Co., Ltd.]). The results are shown in Tables 1 to 3 and FIG.

  From the results of Tables 1 to 3 and FIG. 11, in Examples 1 to 3, when the amount of processing is increased (for example, Example 2 and Example 3), the amount of air is also supplied correspondingly, whereby droplets are supplied. It was confirmed that the average particle diameter (D50) can be controlled to 10 μm or less.

(Example 4)
The nozzle shown in FIG. 3 (nozzle type SJ-10) was subjected to a spray-drying test of a dextrin aqueous solution (Paindex # 2 [manufactured by Matsutani Kagaku]) having a solid content concentration of 50 mass% under the conditions shown in Table 4. As a result, the obtained fine particles had an average particle diameter (D50) of 10 μm or less.

  The method of making the liquid of the present invention fine particles and the nozzle used therefor can be applied to, for example, a nozzle for making a liquid for spray drying fine particles or an industrial humidifier.

FIGS. 2A and 2B show a method of making a liquid into fine particles according to the present invention, wherein FIG. 1A is a cross-sectional explanatory diagram of a main part, and FIG. FIG. The method of making the liquid of this invention into microparticles | fine-particles is shown, (a) And (b) is the elements on larger scale of FIG. 1 (a). It is principal part sectional drawing which shows an example of the nozzle which makes the liquid of this invention fine particle. It is a front view which shows an example of the turning blade | wing which is a member which comprises the nozzle which makes the liquid microparticles | fine-particles of this invention. It is AA sectional drawing of FIG. It is sectional drawing which shows one embodiment of the nozzle which makes the conventional liquid microparticles | fine-particles. It is a schematic sectional drawing which shows the other embodiment of the nozzle which makes the conventional liquid microparticles | fine-particles. It is sectional drawing which shows other embodiment of the nozzle which makes the conventional liquid a microparticle. It is sectional drawing which shows another embodiment of the nozzle which makes the conventional liquid microparticles | fine-particles. It is an enlarged view which shows the front-end | tip part of another embodiment of the nozzle which makes the conventional liquid fine particle, (a) is sectional drawing, (b) is a front view, (c) is a side view. It is a graph which shows the relationship between the average particle diameter of microparticles | fine-particles in each processing amount of Examples 1-3, and the air quantity.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Gas flow path, 2 ... Droplet, 3 ... Fine particle, 4 ... Center hole, 10 ... Inner ring, 11 ... Intermediate ring, 12 ... Outer ring, 13 ... Center ring, 14 ... Tip member, 15 ... Liquid flow path , 16 ... gas flow path, 17 ... smooth surface, 18 ... gas supply port, 19 ... thin film flow, 20 ... smooth surface end, 21 ... gas-liquid flow channel, 22 ... liquid supply port, 25 ... gas inlet, 26 ... Gas inlet, 27 ... liquid inlet, 30 ... fixing projection, 31 ... jet flow, 32 ... fine particles, 35 ... edge, 36 ... center ring, 37 ... spreading air supply path, 38 ... atomizing air supply path, 39 ... Inner intermediate ring, 40 ... first slit, 42 ... second slit, 44 ... outer cap, 45 ... fluid inlet, 46 ... swivel blade, 47 ... gas flow path, 48 ... gas supply path, 49 ... first gas Supply port, 50 ... core, 52 ... liquid flow path 53 ... liquid supply port, 54 ... liquid supply passage, 55 ... second gas supply port, 56 ... center frame, 58 ... guide surface, 60 ... external collision part.

Claims (8)

A first step in which a gas and a liquid are supplied to each of the doubly arranged annular slits at the tip of the nozzle through a gas channel and a liquid channel inside the nozzle;
A second step in which the liquid is ejected from the annular first slit and the gas is ejected from the annular second slit disposed outside the first slit to form a high-speed thin film flow;
The high-speed thin film flow generated by the second step flows along the guide surface of the nozzle, jumps out from the tip of the nozzle, and becomes a jet flow;
A fourth step of atomizing the droplets by colliding at the external collision point while converging the jet stream obtained in the third step toward the external collision point;
A fifth step of spraying the fine particles obtained in the fourth step in an annular shape with the external collision point as a vertex;
A method of making a liquid with a fine particle.   The method according to claim 1, wherein the jet stream has an impact angle of 60 to 160 °.   The method according to claim 1 or 2, wherein an angle formed by the first slit and the second slit is 90 to 160 °.   The method according to any one of claims 1 to 3, wherein a spray angle of the fine particles from the external collision point is 30 to 150 °. An outer cap that forms the appearance of the nozzle;
A swirl vane having a hollow portion at the center, which is inserted and arranged on the inner surface of the tip of the outer cap, and gives a predetermined swirl flow to the gas;
Inserted and arranged in the hollow portion of the swirl vane, and formed an annular slit-like gas flow path between the inner end surface of the outer cap and a gas supply path between the inner side surface of the outer cap Forming a core having a hollow in the center;
Inserted and arranged in the hollow portion of the core, and forming an annular slit-shaped liquid channel between the inner surface of the core and having a liquid supply channel communicating with the liquid channel at the center A center frame,
With
By jetting liquid and gas in an annular shape from the liquid channel and the gas channel, and mixing the gas and liquid, the jet flow including the obtained droplets is focused toward the external collision point, and the external A nozzle that makes liquid droplets sprayed in an annular shape with the external collision point as a vertex by causing the liquid droplets to collide at a collision point to form fine particles.   6. The nozzle for converting liquid into fine particles according to claim 5, wherein a collision angle of the jet flow is 60 to 160 [deg.].   The nozzle for turning liquid into fine particles according to claim 5 or 6, wherein an angle formed by the liquid channel and the gas channel is 90 to 160 °.   The nozzle for turning liquid into fine particles according to any one of claims 5 to 7, wherein a spray angle of the fine particles from the external collision point is 30 to 150 °.

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