Fluid nozzle

Abstract

To provide a fluid nozzle that can remove deposits.SOLUTION: A fluid nozzle is provided with: a center block which has a discharge port in a planar shape which is a horizontally long square, which is constituted of a liquid discharge port that discharges liquid and gas discharge ports formed adjacent to both ends of the liquid discharge port; a fluid nozzle main body having side blocks provided, through a packing, on both ends of the center block; and a deposit removing mechanism that removes deposits on upper surfaces of the side blocks. The deposit removing mechanism has an edge part that removes the deposits from the upper surfaces of the side blocks, and a movable part that moves the edge part along the outside of the packing.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a fluid nozzle. [Background technology]

[0002] As an apparatus for producing fine particles, for example, there is a spray pyrolysis apparatus or a spray drying apparatus. In these apparatuses, a fluid nozzle is installed, and a raw material solution is discharged from a liquid discharge port of the fluid nozzle into a heating furnace to form a mist, and the mist is dried or pyrolyzed to produce fine particles. For example, a two-fluid nozzle or a three-fluid nozzle is used as the fluid nozzle (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-25385 A Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors used a three-fluid nozzle equipped with a center block having an outlet with a horizontally elongated rectangular shape in plan view, and side blocks attached to both ends of the center block via gaskets, and produced particles over a long period of time by ejecting raw material solution from this three-fluid nozzle.However, they encountered problems in that precipitates gradually accumulated on the upper surface of the side blocks and grew large, making it difficult to eject the raw material solution normally, and the produced particles became denser and larger in diameter, making it difficult to ensure stable quality. An object of the present invention is to provide a fluid nozzle capable of removing deposits. [Means for solving the problem]

[0005] The present inventors have conducted various studies on the causes of the formation of precipitates on the upper surface of the side block, and have obtained the following findings. That is, as shown in FIG. 7, the three-fluid nozzle used to manufacture the particles has a horizontally elongated rectangular planar shape of the discharge port 1, and two gas discharge ports 3 are provided adjacent to the long side of the liquid discharge port 2. However, the short side of the liquid discharge port 2 does not come into contact with the gas discharged from the gas discharge port 3. Therefore, it has been found that a part of the mist of the raw material solution discharged from the liquid discharge port 2 adheres to the upper surface 7 of the side block adjacent to the short side of the liquid discharge port 2, and at the same time, the solvent evaporates from the adhered mist to form a precipitate, and the precipitate gradually grows from the adhered mist. In addition, the present inventors have confirmed that when a general two-fluid nozzle is used, the outer periphery of the mist of the raw material solution discharged from the liquid discharge port is quickly sealed by the gas discharged from the gas discharge port, so that no precipitate is formed. Therefore, the problem of such precipitate generation is a problem specific to a three-fluid nozzle having an outlet whose planar shape is a horizontally elongated rectangle. The inventors have found that by providing a precipitate removal mechanism in the fluid nozzle body and removing the precipitates on the upper surface of the side block before they grow large, it becomes possible to continuously and normally eject the raw material solution, and to stably produce homogeneous particles. Here, in this specification, the term "mist" refers to fine particles of liquid dispersed in a gas, in other words, a mist-like liquid.

[0006] That is, the present invention provides the following [1] to [4]. [1] A center block having a liquid ejection port having a horizontally elongated rectangular shape in plan view, the liquid ejection port being configured with gas ejection ports adjacent to both ends of the liquid ejection port; Side blocks are provided at both ends of the center block via packing. a fluid nozzle body having a Deposit removal mechanism that removes deposits from the top surface of the side block A fluid nozzle comprising: The deposit removal mechanism has an edge portion that removes deposits from the upper surface of the side block, and a movable portion that moves the edge portion along the outer side of the packing. Fluid nozzle. [2] The fluid nozzle according to [1] above, wherein the movable part has a movable shaft provided inside a protective tube provided on the outer periphery of the nozzle body. [3] A fluid nozzle according to [1] or [2] above, further comprising a protrusion on the side block adjacent to the short side of the discharge port, the edge portion removing deposits on the upper surface of the protrusion. [4] A fluid nozzle that ejects a raw material solution; A heating furnace that dries or pyrolyzes the mist of raw material solution discharged from a fluid nozzle Equipped with The fluid nozzle is the fluid nozzle according to any one of [1] to [3] above. Spray drying equipment or spray pyrolysis equipment. Effect of the Invention

[0007] According to the present invention, it is possible to provide a fluid nozzle capable of removing precipitates. Therefore, by using the fluid nozzle of the present invention, it is possible to continuously and normally discharge a raw material solution, and therefore it is possible to stably produce homogeneous particles. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic diagram illustrating one embodiment of a fluid nozzle of the present invention. [Diagram 2] 1 is a plan view showing one embodiment of a fluid nozzle of the present invention. [Diagram 3] FIG. 4 is a plan view showing another embodiment of the fluid nozzle of the present invention. [Figure 4] FIG. 4 is a plan view showing another embodiment of the fluid nozzle of the present invention. [Diagram 5] FIG. 4 is a plan view showing another embodiment of the fluid nozzle of the present invention. [Figure 6] FIG. 1 is a schematic diagram showing one embodiment of a spray drying apparatus or a spray pyrolysis apparatus equipped with a fluid nozzle of the present invention. [Figure 7] FIG. 1 is a plan view showing an example of a general structure of a conventional fluid nozzle body. [Figure 8] FIG. 11 is a plan view showing another example of a general structure of a conventional fluid nozzle body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are given the same reference numerals, and duplicated descriptions will be omitted. In addition, for convenience of illustration, the dimensional ratios of the drawings do not necessarily match those in the description.

[0010] 1 is a schematic diagram showing one embodiment of a fluid nozzle of the present invention. Preferred embodiments will be described below with reference to the drawings. 1 is cylindrical in shape. Fluid nozzle 20 includes a fluid nozzle body 10, a protective tube 16 that covers the outer periphery of fluid nozzle body 10 while maintaining a predetermined distance, a heat insulating material 17 that covers the outer periphery of protective tube 16, and a deposit removal mechanism. Examples of the heat insulating material include ceramic fiber, glass fiber, and castable.

[0011] The deposit removal mechanism includes an edge portion 12 that removes deposits from the upper surface of the side block, and a movable portion 13 that moves the edge portion along the outside of the packing. The movable portion 13 is provided inside a protective tube 16 provided on the outer periphery of the fluid nozzle body 10, i.e., in the space between the fluid nozzle body 10 and the protective tube 16.

[0012] A general structure of the discharge port side of a fluid nozzle main body will be described with reference to Figures 7 and 8. Figure 7(a) is a plan view showing an example of a fluid nozzle main body, and Figure 7(b) is a cross-sectional view showing an example of the fluid nozzle main body. The outlet 1 is provided at the approximate center of the center edge 4 and is composed of one liquid outlet 2 and two gas outlets 3. The planar shape of the outlet 1 is a horizontally elongated rectangle as shown in FIG. 7. In this specification, the "planar shape" refers to the shape of the entire fluid nozzle when viewed from directly above, and the "horizontally elongated rectangle" refers to a rectangle whose horizontal direction is longer than its vertical direction. A three-fluid nozzle having an outlet of this shape can easily increase the amount of liquid sprayed without changing the particle size of the mist, and can easily obtain particles with a smaller average diameter than a two-fluid nozzle. The size of the outlet can be appropriately selected in consideration of the amount of liquid sprayed, nozzle strength, etc., according to the size of the fluid nozzle body.

[0013] The horizontally elongated quadrangle is not particularly limited as long as it is a plane figure surrounded by four points and four line segments connecting them, and has sides that are longer in the horizontal direction than in the vertical direction. For example, a rectangle, a parallelogram, a trapezoid, or a quadrangle whose four sides are different in length can be mentioned. Among them, a rectangle and a parallelogram are preferable, and a rectangle is more preferable. The corners of the plane quadrangle may be angular or rounded.

[0014] The gas outlets 3 are provided adjacent to both ends of the long side (longitudinal direction) of the liquid outlet 2. A liquid line (not shown) for supplying liquid to the liquid outlet 2 and a gas line (not shown) for supplying gas to the gas outlet 3 are provided on the center edge 4. Side blocks 6 are provided on both ends of the center block via packings 5. It has been confirmed that when raw material solution is discharged from the liquid outlet 2 of a fluid nozzle body having such a structure to produce particles for a long period of time, precipitates gradually accumulate on the upper surfaces 7 of the side blocks and grow large, making it difficult to normally discharge the raw material solution.

[0015] FIG. 8(a) is a plan view showing another example of the fluid nozzle body, and FIG. 8(b) is a cross-sectional view showing another example of the fluid nozzle. The fluid nozzle body shown in Fig. 8 has a similar structure to the fluid nozzle body shown in Fig. 7, but differs in that a protrusion 8 for guiding the ejection direction of the mist is provided on the side block. It has been confirmed that when raw material solution is ejected from the liquid ejection port 2 of a fluid nozzle body having such a structure to produce particles for a long period of time, precipitates gradually accumulate on the upper surface 9 of the protrusion and grow large, making it difficult to eject the raw material solution normally.

[0016] Therefore, the fluid nozzle of the present invention is characterized in that the fluid nozzle body is provided with a deposit removal mechanism for removing such deposits from the upper surfaces of the side blocks or the upper surfaces of the projections. FIG. 2 shows an embodiment of a fluid nozzle having a deposit removal mechanism provided in the fluid nozzle body. 2, the deposit removal mechanism 11 has an edge portion 12 that removes deposits from the side block upper surface 7, and a movable portion 13 that moves the edge portion along the outside of the packing 5. The edge portion 12 is provided on each side block and is connected to the upper end of the movable portion 13. The material of the deposit removal mechanism 11 is not particularly limited as long as it has workability and heat resistance, but is usually a metal, such as aluminum, iron, stainless steel, nickel alloys (Inconel, Hastelloy), and titanium. The size of the deposit removal mechanism 11 can be appropriately selected in consideration of the size of the fluid nozzle body 10 and the like.

[0017] The edge portion 12 is moved from one end to the other end by the movable portion 13 so as to contact the upper surface of the side block along the outer side of the packing 5 without contacting the discharge port 1, thereby scraping off the precipitates on the upper surface 7 of the side block from the root. This makes it possible to remove the precipitates on the upper surface 7 of the side block before they grow large without damaging the discharge port and the packing, making it possible to continue to discharge the raw material solution normally and stably produce homogeneous particles. Here, in this specification, the "outside of the packing" refers to the periphery of the packing farther from the discharge port. In addition, when the shape of the discharge port is a rectangle as shown in FIG. 2, the edge portion may be controlled to move parallel to the center line in the longitudinal direction of the discharge port. Moreover, the edge portion 12 that has moved to the other end of the side block upper surface 7 can be controlled by the movable portion 13 to return to one end of the side block upper surface 7. This makes it possible to more reliably remove precipitates from the side block upper surface 7, and therefore to more stably produce homogeneous particles. Such reciprocating movement of the edge portion 12 can be performed multiple times, and may be performed continuously or intermittently.

[0018] The fluid nozzle shown in Fig. 3 has a similar configuration to the fluid nozzle shown in Fig. 2, but differs in that the pair of edge portions 12 move in the same direction in the fluid nozzle shown in Fig. 2, whereas the pair of edge portions 12 move in opposite directions in the fluid nozzle shown in Fig. 3. Even in this case, the edge portion 12 that has moved to the other end of the side block upper surface 7 can be controlled to return to one end of the side block upper surface 7. The reciprocating movement of the edge portion 12 can be performed multiple times, and may be performed continuously or intermittently.

[0019] As shown in Fig. 4, the deposit removal mechanism 11 can be provided with a frame 14 around the edge portion main body. This makes it easier to control the trajectory of the edge portion 12 and increases the strength. Even in this case, the edge portion 12 that has moved to the other end of the side block upper surface 7 can be controlled to return to one end of the side block upper surface 7. The reciprocating movement of the edge portion 12 can be performed multiple times, and may be performed continuously or intermittently. Further, a groove or rail may be provided inside the frame 14 so that the edge portion 12 slides inside the frame 14 .

[0020] Furthermore, the deposit removal mechanism 11 can be provided with a guide portion 15 on the movable portion 13 so that the edge portion 12 moves along a predetermined trajectory. Since the edge portion 12 is connected to the movable portion 13, it can move along a predetermined trajectory in conjunction with the movable portion.

[0021] The fluid nozzle shown in FIG. 5 has the same configuration as the fluid nozzle shown in FIG. 4, but is different in that the fluid nozzle shown in FIG. 4 is provided with a pair of edge portions 12, whereas the fluid nozzle shown in FIG. 5 is provided with two pairs of edge portions 12. The edge portions 12 may be provided in three or more pairs. By configuring the edge portions 12 in multiple pairs in this way, the precipitates on the side block upper surface 7 can be more reliably removed, so that homogeneous particles can be produced more stably. Even when the edge portions 12 are configured with multiple pairs, the edge portions 12 that have moved to the other end of the side block upper surface 7 may move back and forth. The back and forth movement can be performed multiple times, and may be performed continuously or intermittently.

[0022] The size of the fluid nozzle body 10 is not particularly limited and can be appropriately selected in consideration of the amount of liquid sprayed, the nozzle strength, etc. For example, the length of the fluid nozzle body is, for example, 400 to 1500 mm, and the outer diameter of the nozzle body is φ40 to 80 mm when the nozzle is cylindrical.

[0023] The fluid nozzle body may be any commercially available one. The fluid nozzle body may be of an internal mixing type in which the liquid and air are mixed inside the nozzle, or an external mixing type in which the liquid and air are mixed outside the nozzle, but the external mixing type is preferred in that it is easier to enjoy the effects of the present invention.

[0024] The fluid nozzle of the present invention is useful as a fluid nozzle to be attached to a spray drying apparatus or a spray pyrolysis apparatus, and is particularly useful as a fluid nozzle to be attached to a spray drying apparatus or a spray pyrolysis apparatus for inorganic oxide particles which are prone to producing precipitates.

[0025] [Spray drying equipment or spray pyrolysis equipment] The spray pyrolysis apparatus or spray drying apparatus of the present invention is equipped with the fluid nozzle of the present invention. Preferred embodiments will be described below with reference to the drawings.

[0026] FIG. 6 is a schematic diagram showing an example of the spray drying apparatus or spray pyrolysis apparatus of the present invention. As shown in FIG. 6, the spray pyrolysis apparatus or spray drying apparatus 100 includes a fluid nozzle 20 for spraying the raw solution in a heating furnace 21, and a heating device 22 for heating the mist formed from the raw solution to dry or pyrolyze it.

[0027] There are no particular limitations on the fluid nozzle 20 as long as it is the fluid nozzle of the present invention. Note that the specific embodiment of the nozzle is as described above. Although it is possible to install one or more fluid nozzles, the device shown in FIG. 6 is installed with one nozzle.

[0028] The material of the heating furnace 21 is not particularly limited as long as it is used as a furnace material, but examples of the material include heat-resistant metals such as iron, stainless steel, nickel alloys (Inconel, Hastelloy), titanium, ceramics, bricks, and amorphous refractories. The shape of the heating furnace 21 can be appropriately selected, but for example, a substantially cylindrical shape can be given. The size of the heating furnace 21 can be appropriately selected depending on the production scale. For example, when it is a vertical cylindrical furnace, the inner diameter is preferably 600 to 1600 mm, and the height is preferably 3000 to 10000 mm.

[0029] The heating device 22 is not particularly limited as long as it can provide the amount of heat required for drying or thermal decomposition of the raw material solution mist, and examples thereof include a combustion burner, a hot air heater, an electric heater, etc. One or more heating devices 22 can be installed. The device shown in FIG. 6 is equipped with eight heating devices. Note that any of the combustion burners, hot air heaters, and electric heaters that are generally available on the market can be used.

[0030] Next, a method for producing inorganic oxide particles will be described as a preferred embodiment of the method for producing particles using a spray drying apparatus or a spray pyrolysis apparatus.

[0031] First, a raw material solution is prepared. The raw material solution is, for example, a solution of a compound containing an element that constitutes an oxide, and is prepared by mixing the raw material compound with a solvent. Examples of the solvent include water and organic solvents. Among them, water is preferred from the viewpoints of the impact on the environment and the production cost. The raw material compound is not particularly limited as long as it contains an element constituting an inorganic oxide and is soluble in water, and examples thereof include inorganic salts, organic salts, alkoxides, etc. Examples of inorganic salts include nitrates, sulfates, carbonates, hydroxides, and halides. Examples of organic salts include formates, acetates, propionates, oxalates, and citrates.

[0032] Examples of elements constituting the inorganic oxide include one or more elements selected from the group 1 elements of the periodic table, group 2 elements of the periodic table, group 4 elements of the periodic table, group 8 elements of the periodic table, group 9 elements of the periodic table, group 10 elements of the periodic table, group 11 elements of the periodic table, group 12 elements of the periodic table, group 13 elements of the periodic table, group 14 elements of the periodic table, and group 15 elements of the periodic table.

[0033] Specific examples of the raw material compounds include the following: Examples of raw material compounds containing Group 1 elements of the periodic table include sodium compounds such as sodium nitrate, sodium chloride, sodium hydroxide, and sodium sulfate, and potassium compounds such as potassium nitrate, potassium chloride, potassium hydroxide, and potassium sulfate. Examples of raw material compounds containing Group 2 elements of the periodic table include magnesium compounds such as magnesium nitrate, magnesium sulfate, magnesium chloride, magnesium phosphate, and magnesium hydroxide, and calcium compounds such as calcium nitrate, calcium chloride, calcium hydroxide, calcium formate, calcium acetate, and calcium propionate. Examples of raw material compounds containing Group 13 elements of the periodic table include boric acid, metaborate, tetraborate, and borate. Specific examples of metaborate include sodium borate and potassium borate, and specific examples of tetraborate include sodium tetraborate and potassium tetraborate. Specific examples of borates include sodium pentaborate and potassium pentaborate. Examples of aluminum compounds include aluminum nitrate, aluminum sulfate, aluminum chloride, aluminum phosphate, aluminum hydroxide, aluminum acetate, and aluminum oxalate. Examples of alkoxides that can be used include silicate alkoxides such as tetramethyl orthosilicate (TMOS), tetraethyl orthosilicate (TEOS), tetrapropyl orthosilicate (TPOS), and tetrabutoxysilane, and aluminum alkoxides such as aluminum methoxide, aluminum ethoxide, and aluminum isopropoxide.Furthermore, aluminosilicates such as sodium aluminosilicate, potassium aluminosilicate, and calcium aluminosilicate, solutions in which aluminum oxide is dispersed in a solvent, and sol solutions of aluminum oxide can also be used.

[0034] The total concentration of the raw material compounds in the raw material solution is usually from 0.01 mol / L to the saturated concentration, and preferably from 0.1 to 1.0 mol / L.

[0035] Next, the raw material solution is sprayed from the liquid outlet of the fluid nozzle of the present invention into the heating furnace, and at the same time, gas is discharged from the gas outlet toward the raw material solution, thereby forming a mist of the raw material solution. Even if the mist adheres to the short side of the outlet and precipitates form on the upper surfaces of the side blocks and the upper surfaces of the protrusions, the precipitates are scraped off by the precipitate removal mechanism before they grow large, making it possible to continue to discharge the raw material solution normally, suppressing increases in density and enlargement of diameter, and producing homogeneous inorganic oxide particles over a long period of time.

[0036] The discharge speed of the raw material solution is usually 1 to 50 m / s, preferably 5 to 35 m / s, and more preferably 10 to 20 m / s. The flow rate of the raw material solution supplied to the liquid discharge port is usually 1 to 100 L / h, preferably 3 to 80 L / h, and more preferably 5 to 60 L / h. The supply pressure of the raw material solution can be appropriately selected depending on the size of the fluid nozzle body and the liquid flow rate, but from the viewpoint of achieving approximately uniform particle size of the mist, it is preferably 0.05 MPa or more, more preferably 0.10 MPa or more, even more preferably 0.15 MPa or more, and is preferably 0.60 MPa or less, more preferably 0.50 MPa or less, and even more preferably 0.40 MPa or less.

[0037] Examples of the gas supplied to the gas outlet include air and inert gases such as nitrogen and argon. Among these, air is preferred from the viewpoint of economy. From the viewpoint of achieving approximately uniform particle size of the mist, the flow rate of the gas supplied to the gas outlet is preferably 200 L / min or more, more preferably 250 L / min or more, even more preferably 400 L / min or more, and is preferably 1500 L / min or less, more preferably 1300 L / min or less, and even more preferably 1250 L / min or less. The gas supply pressure can be appropriately selected depending on the size of the fluid nozzle body and the gas flow rate, but from the viewpoint of achieving approximately uniform particle size of the mist, it is preferably 0.1 MPa or more, more preferably 0.2 MPa or more, even more preferably 0.5 MPa or more, and is preferably 1.0 MPa or less, more preferably 0.9 MPa or less, and even more preferably 0.85 MPa or less.

[0038] The temperature inside the heating furnace can be appropriately selected depending on the type of raw material solution, but is usually 100 to 1800°C, preferably 150 to 1500°C, and more preferably 150 to 1200°C.

[0039] The inorganic oxide particles generated by drying or pyrolysis can be recovered, for example, by moving them from the downstream of the heating furnace to a recovery device using an induction fan. Examples of the recovery device include a cyclone powder recovery machine and a bag filter. In addition, when recovering the inorganic oxide particles, the particle size may be adjusted by passing them through a filter. Furthermore, dust removal and purification equipment such as a scrubber may be installed downstream of the recovery device as necessary.

[0040] Specific examples of inorganic compounds constituting inorganic oxide particles include sodium oxide, potassium oxide, magnesium oxide, calcium oxide, barium oxide, zinc oxide, copper oxide, boron oxide, aluminum oxide, iron oxide, silicon oxide, aluminosilicate, aluminoborosilicate, and barium borosilicate. In addition, composite oxides obtained by combining inorganic oxides may also be used.

[0041] The particles produced by the spray drying apparatus or spray pyrolysis apparatus of the present invention may be solid particles, porous particles, hollow particles, or a mixture of two or more of these. Here, in this specification, "solid particles" refers to particles with a structure that does not have a cavity inside, and examples thereof include particles consisting of a single layer and particles having a core (also called an inner core) and a shell layer (also called an outer shell). Furthermore, "hollow particles" refers to particles with a structure having a cavity (hollow part) inside and having a cavity surrounded by an outer shell. The number of cavities may be single or multiple. Furthermore, "porous particles" refers to particles having a large number of through holes connected from the particle surface to the inside. The size and shape of the through holes are not particularly limited. Furthermore, the particles may have closed pores inside. EXAMPLES

[0042] Example 1 A precipitate removal mechanism with the shape shown in Figure 2 was fabricated by machining Inconel. The precipitate removal mechanism was designed so that the edge part would come into contact with the top surface of the side block when it reciprocated. The precipitate removal mechanism was installed inside a protective tube attached to the outer periphery of the three-fluid nozzle body. Cooling air was introduced inside the protective tube to protect the fluid nozzle body and the precipitate removal mechanism. In addition, a heat insulating material was placed on the outer surface of the protective tube. Then, using the spray pyrolysis device shown in Figure 6, which was equipped with a three-fluid nozzle equipped with this precipitate removal mechanism, inorganic oxide particles were produced in the following procedure to demonstrate the effectiveness. A gas burner was used as the heat source for heating the raw material solution. First, a mixed aqueous solution was prepared by dissolving 0.04 mol of aluminum nitrate and 0.16 mol of tetraethyl orthosilicate in 300 liters of distilled water, and was poured into a solution tank. The mixed aqueous solution was then pumped into a three-fluid nozzle, sprayed as a mist from the liquid outlet, and passed through a heating furnace with an internal temperature of 1150°C. The inorganic oxide particles were then collected using a collection device (bag filter). The spraying time was a total of six hours, with inorganic oxide particles being collected every two hours. The precipitate removal mechanism was moved back and forth twice once every hour.

[0043] Comparative Example 1 The inorganic oxide particles were produced without using a precipitate removal mechanism. The other production conditions were the same as in Example 1.

[0044] 〔evaluation〕 The particle density and average particle size of the inorganic oxides collected every two hours were measured, and the presence or absence of precipitates was confirmed after the end of production. The results are shown in Table 1.

[0045] 1. Measurement of Particle Density The measurements were performed by the gas displacement method using a dry automatic density meter (AccuPic 1340, Shimadzu Corporation). That is, after placing the sample in a cell, the cell was filled with an inert gas and the volume of the sample was measured, and the particle density was calculated from this volume and the sample mass measured in advance.

[0046] 2. Measurement of average particle size Using a particle size distribution analyzer (MT3000II, manufactured by Microtrack Bell), a volume-based particle size distribution was created in accordance with JIS R 1629, and the particle diameter (D 50 ) was sought.

[0047] 3. Presence or absence of precipitates After the manufacturing process was completed, the presence or absence of precipitates on the upper surface of the side block of the three-fluid nozzle body was visually confirmed.

[0048] [Table 1]

[0049] When the top surface of the side block of the fluid nozzle body was checked after production was completed, it was confirmed that in Comparative Example 1, in which a precipitate removal mechanism was not installed, precipitates occurred and the raw material solution could not be continuously ejected normally, resulting in an increase in particle density and a larger diameter over time. In contrast, in Example 1, in which a precipitate removal mechanism was installed, the precipitates were removed before they grew large, and the raw material solution could be continuously and normally discharged. This meant that even when produced over a long period of time, the particles did not increase in density or become larger in diameter, and uniform particles could be stably produced. [Explanation of symbols]

[0050] 1 outlet 2 Liquid outlet 3 Gas outlet 4. Centre Block 5. Packing 6. Side Block 7 Side block top 8 Protrusion 9 Top surface of protrusion 10 Fluid nozzle body 11 Precipitate removal mechanism 12 Edge section 13 Moving parts 14 Frame 15 Guide section 16 Protection tube 17 Insulation 20 Fluid Nozzle 21 Furnace 22 Heating device 100 Spray drying equipment or spray pyrolysis equipment

Claims

1. a center block having a liquid ejection port having a horizontally elongated rectangular shape in plan view, the liquid ejection port being configured with gas ejection ports adjacent to both ends of the liquid ejection port; Side blocks are provided at both ends of the center block via packing. a fluid nozzle body having a Deposit removal mechanism that removes deposits from the top surface of the side block A fluid nozzle comprising: The deposit removal mechanism has an edge portion that removes deposits from the upper surface of the side block, and a movable portion that moves the edge portion along the outer side of the packing. Fluid nozzle.

2. 2. The fluid nozzle according to claim 1, wherein the movable portion has a movable shaft provided inside a protective tube provided on the outer periphery of the nozzle body.

3. A protrusion is provided on the side block adjacent to the short side of the discharge port, The edge portion removes deposits on the upper surface of the protrusion. The fluid nozzle of claim 1 .

4. A fluid nozzle that discharges a raw material solution; A heating furnace that dries or pyrolyzes the mist of raw material solution discharged from a fluid nozzle Equipped with The fluid nozzle is the fluid nozzle according to any one of claims 1 to 3. Spray drying equipment or spray pyrolysis equipment.

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