Sprayer, spray drying apparatus, spray drying system and method of controlling the same

Abstract

The application discloses a sprayer, a spray drying device, a spray drying system and a control method thereof. The sprayer comprises a sprayer body, a liquid material inlet, a liquid material nozzle, a gas inlet, a gas nozzle, a liquid material channel and a gas channel are arranged on the sprayer body. The liquid material nozzle and the liquid material inlet are communicated with the liquid material channel. The gas nozzle and the gas inlet are communicated with the gas channel. The gas nozzle is arranged at the liquid material nozzle. A dispersing member is arranged in the liquid material channel. The dispersing member is arranged at the liquid material nozzle. The dispersing member divides the liquid material channel into a plurality of sub-channels communicated with the liquid material nozzle. The particle size of the granular powder produced by the sprayer can meet the specification requirements.

Description

[0001] The present application is a divisional application of the application No. 202310568410.5, filed on May 19, 2023, entitled "Sprayer, Spray Drying Device, Spray Drying System and Control Method Thereof". TECHNICAL FIELD

[0002] The present application relates to the technical field of spray granulation, in particular to a sprayer, a spray drying device, a spray drying system and a control method thereof. BACKGROUND

[0003] Spray granulation is a method of spraying slurry or solution into a granulation tower, and under the action of spray hot air, the slurry or solution is dried and agglomerated to obtain spherical granules. This method is widely used in the production of various particle size catalysts or other particles with certain particle size requirements. In the spray granulation drying production process, the final collected particle size is different.

[0004] The spray drying device in the related art usually adopts centrifugal atomization drying for granulation, that is, by high-speed rotation of an atomization disc, slurry containing 5%-50% solid content is flung out of the atomization disc at high speed to form small droplets. At this time, clean air heated by a heater completes heat exchange in a spray main tower, so as to achieve the purpose of drying and granulation of the material. The particle size of the granular powder produced by this granulation method is mainly affected by the rotation speed of the atomization disc, and it is impossible to produce small particle size granular powder. SUMMARY

[0005] In view of the above problems, the present application provides a sprayer, a spray drying device, a spray drying system and a control method thereof, and the particle size of the granular powder produced can meet the specification requirements.

[0006] In a first aspect, the present application provides a sprayer, comprising a sprayer body, a liquid material inlet, a liquid material nozzle, a gas inlet, a gas nozzle, a liquid material channel and a gas channel are arranged on the sprayer body, the liquid material nozzle and the liquid material inlet are both in communication with the liquid material channel, the gas nozzle and the gas inlet are both in communication with the gas channel, and the gas nozzle is arranged at the liquid material nozzle.

[0007] In the technical scheme of the present application, the liquid material nozzle and the liquid material inlet are both in communication with the liquid material channel, the gas nozzle and the gas inlet are both in communication with the gas channel, and the gas nozzle is arranged at the liquid material nozzle. In this way, the liquid material sprayed out of the liquid material nozzle and the gas sprayed out of the gas nozzle are sheared and mixed at the liquid material nozzle, so that the liquid material is physically broken and atomized to form small droplets, the small droplets form a spherical shape due to surface tension, and the droplets have a large surface area, so that the water is rapidly evaporated and dried under the action of hot gas flow, and finally shrinks to form dry spherical granular powder with a small diameter.

[0008] In some embodiments, the liquid material channel is provided with a dispersing member arranged at the liquid material outlet, the dispersing member divides the liquid material channel into a plurality of sub-channels in communication with the liquid material outlet.

[0009] In the sprayer of the embodiments of the present application, the liquid material is cut by the dispersing member when flowing through the dispersing member, thereby facilitating the formation of smaller droplets at the liquid material outlet.

[0010] In some embodiments, the dispersing member is provided with a plurality of sub-channels formed between the outer surface of the dispersing member and the inner wall of the liquid material channel.

[0011] In the sprayer of the embodiments of the present application, the liquid material flows through the plurality of sub-channels into the liquid material outlet when flowing through the dispersing member, so that the liquid material is dispersed in the liquid material channel, thereby facilitating the formation of smaller droplets at the liquid material outlet.

[0012] In some embodiments, the dispersing member comprises a prismatic segment, each side wall of the prismatic segment and the inner wall of the liquid material channel form a sub-channel.

[0013] In the sprayer of the embodiments of the present application, the liquid material is cut by the side edges between the adjacent two side walls of the dispersing member when flowing through the dispersing member, thereby further facilitating the formation of smaller droplets at the liquid material outlet.

[0014] In some embodiments, the prismatic segment comprises a first prismatic segment and a second prismatic segment connected to each other, the first prismatic segment has a larger circumscribed circle radius of cross section than the second prismatic segment, and the first prismatic segment is located on the side of the second prismatic segment facing the liquid material outlet.

[0015] In the sprayer of the embodiments of the present application, the flow rate of the liquid material in the liquid material channel is changed, and the liquid material is sprayed at a certain angle from the liquid material outlet, thereby facilitating the formation of smaller droplets at the liquid material outlet.

[0016] In some embodiments, the liquid material outlet is provided with a nozzle member located on the side of the dispersing member facing the liquid material outlet, and the peripheral edge of the nozzle member is sealingly connected to the inner wall of the liquid material channel, the nozzle member is provided with a nozzle hole in communication with each of the sub-channels.

[0017] In the sprayer of the embodiments of the present application, the liquid material is sprayed at high speed from the nozzle hole, thereby increasing the speed of the liquid material sprayed from the liquid material outlet, and facilitating the formation of smaller droplets.

[0018] In some embodiments, the dispersing member is in clearance fit with the inner wall of the liquid material passage, the dispersing member comprises an abutting column segment, the abutting column segment is located on one side of the prism segment towards the spout member, a plurality of communication grooves are arranged on the sidewall of the abutting column segment, and each of the communication grooves is in communication with the spray hole and at least one of the sub-passages.

[0019] In the sprayer of the embodiments of the present application, the liquid material is cut and dispersed by the communication grooves when the liquid material flows through the dispersing member, which is further conducive to forming smaller droplets at the liquid material spout.

[0020] In some embodiments, the communication grooves are arranged in an inclined manner relative to the axis of the abutting column segment.

[0021] In the sprayer of the embodiments of the present application, the flow direction of the liquid material in the liquid material passage is changed, so that a rotating vortex is formed, which is further conducive to cutting and dispersing the liquid material.

[0022] In some embodiments, the spray hole comprises a tapered hole segment and a column hole segment, the column hole segment is connected with the small end of the tapered hole segment, the large end of the tapered hole segment is provided for the abutting column segment to extend into, and one end of the communication groove penetrates one end of the abutting column segment towards the spout member and is in communication with the tapered hole segment.

[0023] In the sprayer of the embodiments of the present application, the gas is spirally sprayed out of the spray hole at high speed, so that the flow direction of the liquid material is changed, which is conducive to further cutting and dispersing the liquid material by air.

[0024] In some embodiments, the spout member is in interference fit with the liquid material passage.

[0025] In the sprayer of the embodiments of the present application, in this way, the probability of the spout member being sprayed out of the liquid material spout is reduced.

[0026] In some embodiments, a limiting part is arranged on the side of the spout member away from the dispersing member, and the limiting part is used to prevent the spout member from moving out of the liquid material spout.

[0027] In the sprayer of the embodiments of the present application, in this way, the probability of the spout member being sprayed out of the liquid material spout is further reduced.

[0028] In some embodiments, the limiting part is an annular flange arranged at one end of the liquid material passage, the diameter of the central hole of the annular flange is smaller than the maximum diameter of the spout member, and the central hole of the annular flange is the liquid material spout.

[0029] In the sprayer of the embodiments of the present application, the supporting member not only reduces the probability of the spout member being sprayed out of the liquid material spout, but also reduces the diameter of the liquid material spout, which is conducive to obtaining granules with smaller particle size.

[0030] In some embodiments, the sprayer body comprises an outer tube and an inner tube arranged in the outer tube, a lumen of the inner tube being the liquid channel, a space between the inner tube and the outer tube being the gas channel; the liquid outlet is an end opening of the inner tube, and the liquid outlet is located at an end opening of the outer tube, and the gas outlet is arranged around the liquid outlet.

[0031] In the sprayer of the embodiments of the present application, the gas outlet is arranged around the liquid outlet, so that the liquid sprayed from the liquid outlet is fully cut in various directions by the gas sprayed from the gas outlet, thereby facilitating the formation of smaller droplets.

[0032] In some embodiments, the outer side of the inner tube is sleeved with a sleeve, the sleeve is located at an end of the inner tube where the liquid outlet is arranged, a first end of the sleeve is sealingly connected with the outer tube, a second end of the sleeve extends into the outer tube and is sealingly connected with the inner tube, the gas outlet is located at the first end of the sleeve and is formed between the sleeve and the inner tube; a plurality of gas holes are arranged on the peripheral wall of the sleeve in the circumferential direction, and the plurality of gas holes are in communication with the liquid channel and the gas channel.

[0033] In the sprayer of the embodiments of the present application, a plurality of gas holes are arranged on the peripheral wall of the sleeve in the circumferential direction, and the plurality of gas holes are in communication with the liquid channel and the gas channel, so that the disturbance of the liquid in the liquid channel during flow is increased, thereby facilitating the full cutting of the liquid.

[0034] In some embodiments, each of the gas holes is an inclined hole, a hole axis of the inclined hole and a central axis of the sleeve are different straight lines; the plurality of gas holes are arranged at intervals along the circumferential direction of the sleeve, and the inclination directions of each of the gas holes are the same.

[0035] In the sprayer of the embodiments of the present application, the direction of the gas is changed, so that a vortex flow is formed, thereby further facilitating the cutting of the liquid.

[0036] In some embodiments, an inclination angle of the hole axis of the gas hole with respect to the central axis of the sleeve ranges from 15° to 60°, wherein the inclination angle is an acute angle between the hole axis of the gas hole and a first normal line, and the first normal line is a normal line of a cylindrical surface where an outer peripheral surface of the sleeve at a position where the cylindrical surface intersects with the hole axis of the gas hole.

[0037] In the sprayer of the embodiments of the present application, this can achieve the purpose of taking into account the particle size and uniformity.

[0038] In some embodiments, the spacing between two adjacent gas holes is equal.

[0039] In the sprayer, the liquid material is uniformly cut by the gas, so that the uniformity of the granules is improved.

[0040] In some embodiments, the sleeve has a lumen in the shape of a neck, and the gas nozzle is located at the small opening end of the lumen.

[0041] In the sprayer, the direction of the gas is changed, so that the liquid material is better cut.

[0042] In some embodiments, the outer tube comprises an outer tube body and a containing tube, one end of the containing tube is detachably connected to the outer tube body, the other end of the containing tube is provided with a mounting hole, the first end of the sleeve is adapted to extend into the mounting hole, and the second end of the sleeve extends into the containing tube.

[0043] In the sprayer, the reliability of the connection between the outer tube and the sleeve is improved.

[0044] In some embodiments, the inner tube comprises an inner tube body and a nozzle tube detachably connected to the inner tube body, the nozzle tube is arranged in the containing tube, the nozzle of the nozzle tube away from the inner tube body is the liquid material nozzle, and the sleeve is sleeved on the nozzle tube.

[0045] In the sprayer, not only is the disassembly and maintenance of the sprayer convenient, but also the strength of the connection between the sleeve and the nozzle tube is improved.

[0046] In some embodiments, a connecting flange in the shape of a ring is arranged on the peripheral wall of the inner tube, the connecting flange comprises a matching portion and a stop portion arranged along the axial direction of the inner tube, the diameter of the stop portion is greater than the diameter of the matching portion, the matching portion is adapted to extend into the nozzle of the second end of the sleeve, and the stop portion is stopped at the edge of the nozzle of the second end of the sleeve.

[0047] In the sprayer, the connection between the inner tube and the sleeve is firm.

[0048] In some embodiments, a support is arranged in the outer tube body, the support is arranged at the end of the outer tube body and is supported between the outer tube body and the inner tube.

[0049] In the sprayer, the arrangement of the support increases the strength of the connection between the outer tube and the inner tube, thereby reducing the deformation of the outer tube, and improving the reliability of the sprayer.

[0050] In some embodiments, the support comprises a plurality of support arms arranged along the circumferential direction of the inner tube, and a space for air to pass through is formed between adjacent two support arms.

[0051] In the sprayer of the embodiment of the present application, the support can connect the inner tube and the outer tube and deliver air.

[0052] In the third aspect, the embodiment of the present application further provides a spray drying system, which comprises a feeding system, an air supply system and the spray drying device in the second aspect, the feeding system is connected with the liquid material inlet of the sprayer, and the air supply system is connected with the gas inlet of the sprayer.

[0053] In the spray drying system of the embodiment of the present application, since the spray drying system comprises the sprayer provided in the first aspect, the spray drying system also has the technical effects corresponding to the sprayer, which will not be repeated here.

[0054] In the third aspect, the embodiment of the present application further provides a spray drying system, which comprises a feeding system, an air supply system and the spray drying device in the second aspect, the feeding system is connected with the liquid material inlet of the sprayer, and the air supply system is connected with the gas inlet of the sprayer.

[0055] In the spray drying system of the embodiment of the present application, since the spray drying system comprises the sprayer provided in the first aspect, the spray drying system also has the technical effects corresponding to the sprayer, which will not be repeated here.

[0056] In some embodiments, the feeding system comprises a feeding line, a liquid material storage device and a water storage device; one end of the feeding line is connected with the liquid material storage device, the other end is connected with the liquid material inlet of the sprayer, a delivery pump and a first control valve are arranged on the feeding line, and the first control valve is arranged between the delivery pump and the liquid material storage device; the water storage device is connected with the feeding line through a water supply line, the water supply line is connected between the delivery pump and the first control valve, and a second control valve is arranged on the water supply line.

[0057] In the spray drying system of the embodiment of the present application, the liquid material delivery and the water delivery share a feeding line, so that the feeding and the cleaning can be realized by the feeding line, which not only saves the modification cost and is conducive to market promotion, but also saves the process of disassembling and cleaning the sprayer, thereby saving the labor cost.

[0058] In some embodiments, the gas supply system comprises a first gas supply line and a second gas supply line, the first gas supply line being in communication with the gas inlet, and the second gas supply line being in communication with the liquid material inlet, and a third control valve being arranged on the second gas supply line.

[0059] In the spray drying system of the embodiments of the present application, the opening and closing of the third control valve can be controlled to realize the switching of the gas supply to the liquid material channel of the atomizer to remove the liquid material and residues such as water in the liquid material channel, and the switching of the gas supply to the gas channel.

[0060] In some embodiments, the delivery pump comprises a plunger pump and a diaphragm pump, and the diaphragm pump is arranged between the first control valve and the plunger pump.

[0061] In the spray drying system of the embodiments of the present application, the plunger pump generates a high pressure, so that the liquid material is extracted and delivered to the liquid material channel of the atomizer in the feed line at a certain pressure by the diaphragm pump.

[0062] In some embodiments, a pulsation damper and / or a back pressure valve are further arranged on the feed line, the pulsation damper being arranged on the outlet side of the plunger pump, and the back pressure valve being arranged on the outlet side of the plunger pump.

[0063] In the spray drying system of the embodiments of the present application, the back pressure valve can be used to adjust the outlet pressure of the plunger pump to keep the feed line at a constant pressure, and the pulsation damper can not only reduce the influence of the pulse of the plunger pump on the flow rate or pressure output by the plunger pump, but also slow down the impact of the liquid material flow.

[0064] In some embodiments, a de-ironer and / or a first filter are arranged on the feed line between the plunger pump and the diaphragm pump.

[0065] In the spray drying system of the embodiments of the present application, in this way, the impurities in the liquid material are reduced, so that the purity of the liquid material is improved, and the influence of the impurities in the liquid material on the plunger pump is reduced.

[0066] In some embodiments, the ratio of the gas supply amount of the first gas supply line to the liquid material supply amount of the feed line to the atomizer is in the range of 1-15.

[0067] In the spray drying system of the embodiments of the present application, in this way, the particle size and the gas consumption can be considered.

[0068] In some embodiments, the pressure ratio of the first gas supply line to the feed line is 0.6:3.5.

[0069] In the spray drying system of the embodiments of the present application, in this way, the particle size and the gas consumption can be considered.

[0070] In some embodiments, the spray drying system further comprises a drying system, the drying system comprising an air supply line, a heater, a first fan and a second filter, one end of the air supply line being connected with the second filter, the other end of the air supply line being connected with the drying cavity, the first fan and the heater being arranged on the air supply line.

[0071] In the spray drying system of the embodiments of the present application, the liquid material is delivered to the drying cavity by the sprayer and is formed into granules in one step in the drying cavity.

[0072] In some embodiments, a third filter is further arranged on the air supply line, and the third filter is arranged on the air outlet side of the heater.

[0073] In the spray drying system of the embodiments of the present application, the third filter is arranged to filter impurities in the air on the air supply line, thereby reducing the influence of the impurities on the spray drying device.

[0074] In some embodiments, the second filter is a primary filter or a medium-efficiency filter, and the third filter is a high-efficiency filter.

[0075] In the spray drying system of the embodiments of the present application, the impurities formed in the heater are filtered when the air is heated in the heater, thereby further reducing the influence of the impurities on the spray drying device.

[0076] In a fourth aspect, the embodiments of the present application further provide a control method of a spray drying system, which comprises, after the spray drying device completes drying and granulation of the liquid material, closing the first control valve, opening the second control valve, causing the delivery pump to deliver the water in the water storage device to the liquid material channel of the sprayer through the feeding line, and after a preset time, closing the delivery pump.

[0077] In the control method of the spray drying system of the embodiments of the present application, since the control method of the spray drying system is used after the spray drying device completes drying and granulation of the liquid material, the control method of the spray drying system also has the technical effects corresponding to the spray drying device provided in the second aspect, which will not be described herein.

[0078] In some embodiments, after the delivery pump is closed, the method further comprises: opening the third control valve, causing the gas in the second gas supply line to enter the liquid material channel of the sprayer.

[0079] In the control method of the spray drying system of the embodiments of the present application, the gas can be delivered to the liquid material channel to remove the residues such as the liquid material and water in the liquid material channel.

[0080] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0081] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0082] In the drawings:

[0083] Figure 1 Structure schematic diagram of the sprayer provided for some embodiments of the present application;

[0084] Figure 2 Structure schematic diagram of the sprayer provided for some embodiments of the present application; Figure 1

[0085] Figure 3 Structure schematic diagram of the sprayer provided for some embodiments of the present application; Figure 2

[0086] Figure 4 Structure schematic diagram of the dispersing member provided for some embodiments of the present application from another perspective;

[0087] Figure 5 Structure schematic diagram of the dispersing member provided for some embodiments of the present application from another perspective;

[0088] Figure 6 Structure schematic diagram of the sprayer provided for some embodiments of the present application; Figure 1

[0089] Figure 7 Structure schematic diagram of the sprayer provided for some embodiments of the present application; Figure 2

[0090] Figure 8 Structure schematic diagram of the sprayer provided for some embodiments of the present application; Figure 1

[0091] Figure 9 Structure schematic diagram of the sprayer provided for some embodiments of the present application; Figure 8

[0092] Figure 10 Structure schematic diagram of the sprayer provided for some embodiments of the present application; Figure 8

[0093] Figure 11 Structure schematic diagram of the spray drying system provided for some embodiments of the present application;​​​​​​​

[0094] Figure 12 for Figure 11 Schematic diagram of the connection between the spray drying device and the feeding system, air supply system and drying system;

[0095] Figure 13 for Figure 11 Structural diagram of the feeding system in FIG.

[0096] Figure 14 for Figure 11 Schematic diagram of the drying system in FIG.

[0097] Figure 15 for Figure 11 Schematic diagram of the dust removal system.

[0098] The accompanying drawings in the specific implementation manner are as follows:

[0099] 1. First control valve; 2. Second control valve; 3. Third control valve; 4. Plunger pump; 5. Diaphragm pump; 6. Pulsation damper; 7. Back pressure valve; 8. Iron remover; 9. Fourth control valve;

[0100] 100. Spray drying device; 10. Sprayer; 11. Sprayer body; 111. Outer tube; 1110. Mounting hole; 1111. Outer tube body; 1112. Receiving tube; 112. Inner tube; 1121. Inner tube body; 1122. Spray nozzle; 113. Sleeve; 1130. Air hole; 1131. First end; 1132. Second end; 114. Lumen; 115. Connecting flange; 1151. Mating portion; 1152. Stopper; 12. Liquid inlet; 13. Liquid nozzle; 14. Gas inlet; 15. Gas nozzle; 16. Liquid channel; 160. Subchannel; 17. Gas channel.

[0101] 20. Dispersing element; 21. Prism segment; 211. First prism segment; 212. Second prism segment; 22. Abutting column segment; 23. Connecting groove;

[0102] 30. Nozzle member; 31. Spray hole; 311. Cone hole section; 3111. Small mouth end; 3112. Large mouth end; 312. Column hole section; 32. Limiting portion;

[0103] 40. Support member; 41. Support arm;

[0104] 50. Drying chamber; 51. Chamber wall;

[0105] 60. Sealing member; 61. Through hole;

[0106] 200, supply system; 210, supply line; 220, storage device; 230, water storage device; 240, first filter; 250, water supply line; 260, manual valve; 270, pressure regulating valve; 280, check valve;

[0107] 300, gas supply system; 310, first gas supply line; 320, second gas supply line;

[0108] 400, drying system; 410, air supply line; 420, heater; 430, first fan; 440, second filter; 450, third filter;

[0109] 500, dust removal system; 510, cyclone separator; 520, bag filter; 530, second fan. DETAILED DESCRIPTION

[0110] Embodiments of the present application are described below in detail with reference to the accompanying drawings, in which examples of the embodiments are shown, and wherein the same or similar elements or elements having the same or similar functions are denoted by the same or similar reference numerals throughout the drawings. The following describes the embodiments by referring to the accompanying drawings. Figures 1-15 The embodiments described below are examples for explaining the present application and should not be understood as a limitation of the present application. Figures 1-15 The embodiments described below are examples for explaining the present application and should not be understood as a limitation of the present application.

[0111] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as a limitation of the present application.

[0112] In addition, the terms "first", "second" are only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0113] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connected", "connection", "fixed", and the like, should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0114] In the description of the present application, it should be pointed out that the term "and / or" is only to describe the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone.

[0115] It should also be pointed out that the same part or the same material is represented by the same reference numeral in the embodiments of the present application. For the same parts or materials in the embodiments of the present application, only one part or material may, for example, be labeled with a reference numeral in the drawing, and it should be understood that the reference numeral is also applicable to other identical parts or materials.

[0116] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", "in one possible design", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0117] Granulation is a very important process in the production of PTC thermosensitive ceramic sheet, and the quality of granular powder (referred to as granules) directly affects the appearance, mechanical properties and boiling dryer resistance temperature characteristics of PTC ceramic sheet. Granulation refers to adding a certain amount of binder to the finely ground powder, uniformly mixing it to form granular powder. Such powder has good fluidity and calenderability, and can obtain a sheet with good strength and less delamination and cracking in the sheeting process.

[0118] In industrial production, spray drying method is used for granulation. The basic principle is to spray the powder with binder into the granulation tower (also called drying tower) by a sprayer for atomization. The drying tower has a drying chamber, and the mist droplets in the drying chamber are dried into granular powder by the hot gas flow in the drying chamber, and then discharged from the bottom of the drying chamber.

[0119] The spray drying device in the related art usually adopts centrifugal atomization drying for granulation, that is, through the high-speed rotation of the atomizing disk, the slurry with a solid content of 5%-50% is thrown out of the atomizing disk at high speed to form tiny droplets. At this time, the clean air heated by the heater completes the heat exchange in the main spray tower, thereby achieving the purpose of drying and granulating the material. The particle size of the granular powder produced by this granulation method is mainly affected by the rotation speed of the atomizing disk. The particle size of the granular powder produced by the above granulation method cannot meet the specification requirements.

[0120] Based on this, an embodiment of the present application provides a sprayer, which is provided with a liquid inlet, a liquid nozzle, a gas inlet, a gas nozzle, a liquid channel and a gas channel on the sprayer body, and then the liquid nozzle and the liquid inlet are connected to the liquid channel, and the gas nozzle and the gas inlet are connected to the gas channel, and the gas nozzle is arranged at the liquid nozzle. In this way, the liquid ejected from the liquid nozzle and the gas ejected from the gas nozzle are sheared and mixed at the liquid nozzle, so that the liquid is physically broken and atomized by the gas to form tiny droplets. In the drying chamber, the tiny droplets are rapidly evaporated and dried under the action of the hot air flow, and finally shrink to form dry spherical particles of smaller diameter.

[0121] In a spray drying system, liquid enters the drying chamber through the liquid channel of the sprayer and the liquid nozzle, starting the spray granulation drying process. The specific process is divided into three stages: liquid atomization, mist particles drying into balls, and granular powder discharge. The spray drying unit is the core device of the spray drying system.

[0122] The spray drying apparatus consists of a drying chamber with a sprayer mounted on the wall. The sprayer's outlet is located within the drying chamber, while its inlet is connected to the end of the feed system. The sprayer, also known as a spray gun, is a key component that sprays liquid material into the drying chamber at a constant pressure, completing atomization and drying within the drying chamber to form spherical pellets.

[0123] like Figures 1-4 As shown, Figure 1 This is a schematic diagram of the structure of the sprayer 10 provided in some embodiments of the present application. Figure 2 for Figure 1 AA cross-section diagram, Figure 3 for Figure 2 An enlarged view of the local structure at the liquid material nozzle 13, Figure 4Schematic diagram of the structure of the dispersion element 20 provided in some embodiments of the present application from one perspective. The embodiments of the present application provide a sprayer 10, including a sprayer body 11, on which are provided a liquid material inlet 12, a liquid material nozzle 13, a gas inlet 14, a gas nozzle 15, a liquid material channel 16, and a gas channel 17. The liquid material nozzle 13 and the liquid material inlet 12 are both connected to the liquid material channel 16, and the gas nozzle 15 and the gas inlet 14 are both connected to the gas channel 17. The gas nozzle 15 is disposed at the liquid material nozzle 13; a dispersion element 20 is disposed in the liquid material channel 16, and the dispersion element 20 is disposed at the liquid material nozzle 13. The dispersion element 20 divides the liquid material channel 16 into a plurality of sub-channels connected to the liquid material nozzle 13.

[0124] In the sprayer 10 of the embodiment of the present application, the liquid material nozzle 13 and the liquid material inlet 12 are connected to the liquid material channel 16, the gas nozzle 15 and the gas inlet 14 are connected to the gas channel 17, the gas nozzle 15 is arranged at the liquid material nozzle 13, and a dispersion member 20 is arranged in the liquid material channel 16, so that the liquid material channel 16 is dispersed to form a plurality of sub-channels. When the liquid flows through the dispersion member 20 through the liquid material channel 16, it flows to the liquid material nozzle 13 through the sub-channel, so that the liquid is dispersed in the liquid material channel 16. The dispersion element 20 disperses, thereby increasing the disturbance of the liquid during the flow process, and then flows to the liquid nozzle 13. In this way, the liquid ejected from the liquid nozzle 13 and the gas ejected from the gas nozzle 15 are sheared and mixed at the liquid nozzle 13, so that the liquid is physically broken up and atomized by the gas to form tiny droplets. The tiny droplets form spherical shapes due to surface tension. At the same time, since the droplets have a large surface area, the water evaporates and dries rapidly under the action of the hot air flow, and finally shrinks to form dry spherical particles of smaller diameter.

[0125] like Figure 3 and Figure 4 As shown, in some embodiments, a plurality of sub-channels are formed between the outer surface of the dispersing member 20 and the inner wall of the liquid channel 16 .

[0126] Through the above arrangement, when the liquid flows through the dispersing member 20, a portion of the liquid is blocked by the dispersing member 20 and then redirected from the outer surface of the dispersing member 20 through multiple sub-channels to flow into the liquid nozzle 13. The liquid is first dispersed by the dispersing member 20 in the liquid channel 16 and then cut by the air at the liquid nozzle 13, which is conducive to the formation of smaller droplets at the liquid nozzle 13.

[0127] In addition to forming a plurality of sub-channels between the outer surface of the dispersing member 20 and the inner wall of the liquid material passage 16, the dispersing member 20 can also be designed as a lattice structure to form a plurality of sub-channels inside the dispersing member 20, or the dispersing member 20 can be designed as a lattice structure on the basis of forming a plurality of sub-channels between the outer surface of the dispersing member 20 and the inner wall of the liquid material passage 16, so that a plurality of sub-channels are formed inside and on the outer surface of the dispersing member 20, which is more conducive to the dispersion of the liquid material.

[0128] As shown in FIG. 1, Figure 4 In some embodiments, the dispersing member 20 includes a prismatic segment 21, and each side wall of the prismatic segment 21 forms a sub-channel with the inner wall of the liquid material passage 16.

[0129] Through the above arrangement, the liquid material passage 16 is divided into a plurality of sub-channels in the circumferential direction in the cross section perpendicular to the axial direction of the sprayer body 11, so that the liquid material is more uniformly disturbed and dispersed by the dispersing member 20, which is further conducive to forming smaller droplets at the liquid material spray outlet 13.

[0130] For example, the prismatic segment 21 described above can be a quadrangular prism, or a triangular prism, or a pentagonal prism, or other polygonal prism. Of course, in addition to including the prismatic segment 21, the dispersing member 20 can also be designed as a cylindrical structure, in which case the inner wall of the liquid material passage 16 is composed of a plurality of planar side walls, and the connection between adjacent two planar side walls forms a sub-channel with the outer surface of the dispersing member 20, which is not specifically limited here.

[0131] As shown in FIG. 1, Figures 3-5 As shown in FIG. 1, Figure 5 As shown in FIG. 1, Figure 1 is an exploded view of the sprayer 10 in FIG. 1. In some embodiments, the prismatic segment 21 includes a first prismatic segment 211 and a second prismatic segment 212 connected to each other, the first prismatic segment 211 has a larger circumcircle radius of cross section than the second prismatic segment 212, and the first prismatic segment 211 is located on the side of the second prismatic segment 212 facing the liquid material spray outlet 13.

[0132] The cross section mentioned above refers to a cross section perpendicular to the axial direction of the dispersing member 20.

[0133] The circumcircle refers to a circle in the above-mentioned cross section, the contour of the prismatic segment 21 is a polygon, and the circle intersecting each vertex of the polygon is called the circumcircle of the polygon.

[0134] Through the above arrangement, in the cross section perpendicular to the axis of the sprayer body 11, the size of the sub-passage located in the first prismatic section 211 is smaller than the size of the sub-passage located in the second prismatic section 212, that is, when the liquid material flows from the second prismatic section 212 to the first prismatic section 211, the space through which the liquid material can pass is reduced, thereby changing the flow rate of the liquid material in the liquid material passage 16, further increasing the disturbance of the liquid material, and making the liquid material be sprayed at a certain angle from the liquid material spray port 13, thereby facilitating the formation of smaller droplets at the liquid material spray port 13.

[0135] As shown in Figure 3 , Figure 6 and Figure 7 , Figure 6 is an exploded view of the sprayer 10 in Figure 1 , Figure 7 is a cross-sectional view of the nozzle piece 30 in Figure 2 . In some embodiments, the liquid material spray port 13 is provided with a nozzle piece 30 located on the side of the dispersing piece 20 facing the liquid material spray port 13, and the peripheral edge of the nozzle piece 30 is sealingly connected to the inner wall of the liquid material passage 16. The nozzle piece 30 is provided with a spray hole 31, and the spray hole 31 is in communication with each sub-passage.

[0136] By providing the nozzle piece 30 on the side of the dispersing piece 20 facing the liquid material spray port 13, and sealingly connecting the peripheral edge of the nozzle piece 30 to the inner wall of the liquid material passage 16, the connection between the nozzle piece 30 and the liquid material passage 16 is firm. The nozzle piece 30 is provided with a spray hole 31, so that the liquid material is sprayed at high speed from the spray hole 31, which increases the speed of the liquid material sprayed from the liquid material spray port 13, thereby facilitating the formation of smaller droplets.

[0137] As shown in Figures 3-5 , in some embodiments, the dispersing piece 20 is in clearance fit with the inner wall of the liquid material passage 16, and the dispersing piece 20 includes an abutting column section 22 located on the side of the prismatic section 21 facing the nozzle piece 30. The side wall of the abutting column section 22 is provided with a plurality of communication grooves 23, and each communication groove 23 is in communication with the spray hole 31 and at least one sub-passage. By clearance fit between the dispersing piece 20 and the inner wall of the liquid material passage 16, and by providing a plurality of communication grooves 23 on the side wall of the abutting column section 22, when the liquid material flows through the dispersing piece 20, the disturbance of the liquid material is increased, and at the same time, the liquid material is cut and dispersed by the communication grooves 23, which further facilitates the formation of smaller droplets at the liquid material spray port 13.

[0138] For example, the side wall of the abutting column section 22 is provided with two communication grooves 23. Of course, the number and size of the above-mentioned communication grooves 23 are determined in combination with the flow rate of the liquid material, the particle size of the granular material, etc., and are not specifically limited here.

[0139] As shown in Figure 4 and Figure 5As shown, in some embodiments, the communicating groove 23 is arranged to be inclined relative to the axial direction of the abutting column section 22 .

[0140] By tilting the connecting groove 23 relative to the axial direction of the abutting column section 22, the flow direction of the liquid in the liquid channel 16 is changed, thereby forming a rotating vortex at the connection point between the connecting groove 23 and the liquid channel 16, which further facilitates the cutting and dispersion of the liquid.

[0141] like Figure 3 As shown, in some embodiments, the nozzle 31 includes a conical hole section 311 and a column hole section 312, the column hole section 312 is connected to the small mouth end 3111 of the conical hole section 311, and the large mouth end 3112 of the conical hole section 311 can be used for the abutting column section 22 to extend into, and one end of the connecting groove 23 passes through the abutting column section 22 toward one end of the nozzle member 30 and is connected to the conical hole section 311.

[0142] The small-mouth end 3111 of the tapered hole section 311 refers to the end of the tapered hole with a smaller aperture, and the large-mouth end 3112 of the tapered hole section 311 refers to the end of the tapered hole with a larger aperture.

[0143] One end of the connecting groove 23 passes through the abutting column section 22 and is connected to the tapered hole section 311 toward the end of the nozzle member 30 , so that the liquid material is ejected from the nozzle hole 31 in a high-speed spiral manner, thereby being cut and dispersed by the air.

[0144] like Figure 3 and Figure 7 As shown, in some embodiments, the nozzle member 30 is interference fit with the liquid channel 16 .

[0145] The above-mentioned interference fit refers to a fit with interference (including a minimum interference of zero). That is, in a cross section perpendicular to the axial direction of the sprayer body 11, the algebraic difference between the dimensions of the nozzle member 30 in various directions and the dimensions of the matching liquid channel 16 in various directions is subtracted. If this difference is negative, it is an interference fit.

[0146] The nozzle member 30 and the liquid channel 16 are tightly connected by an interference fit. Thus, when the liquid flows to the liquid nozzle 13 at a high speed, the probability of the nozzle member 30 being ejected from the liquid nozzle 13 along with the liquid is reduced, thereby improving the reliability of the sprayer 10 and extending the service life of the sprayer 10.

[0147] like Figure 3 As shown, in some embodiments, a limiting portion 32 is provided on a side of the nozzle member 30 away from the dispersing member 20 , and the limiting portion 32 is used to prevent the nozzle member 30 from moving out of the liquid material nozzle 13 .

[0148] The setting of the limiting part 32 limits the nozzle part 30 in the liquid material nozzle 13 of the atomizer 10, which reduces the probability of the nozzle part 30 being ejected from the liquid material nozzle 13, and thus reduces the probability of the ejection of the nozzle part 30 from the liquid material nozzle 13 causing the equipment to malfunction.

[0149] As shown in the figure, in some embodiments, the limiting part 32 can be a ring-shaped flange arranged at one end of the liquid material channel 16, the central hole of the ring-shaped flange has a diameter smaller than the maximum diameter of the nozzle part 30, and the central hole of the ring-shaped flange is the liquid material nozzle 13. Figure 3

[0150] By arranging the ring-shaped flange at one end of the liquid material channel 16 as the limiting part 32, the limiting part 32 not only reduces the probability of preventing the nozzle part 30 from being removed from the liquid material nozzle 13, thus reducing the risk of equipment malfunction, but also the diameter of the central hole of the ring-shaped flange is smaller than the maximum diameter of the nozzle part 30, which reduces the diameter of the liquid material nozzle 13, thus facilitating the production of smaller particle size granules.

[0151] Of course, in addition to the ring-shaped flange arranged at one end of the liquid material channel 16, the limiting part 32 can also be a ring-shaped part arranged at the liquid material nozzle 13 of the liquid material channel 16, which can be connected to the end face of the liquid material channel 16 near the liquid material nozzle 13 by clamping or bonding, etc., for preventing the nozzle part 30 from being removed from the liquid material nozzle 13, which is not specifically limited here.

[0152] As shown in the figure, in some embodiments, the atomizer body 11 includes an outer tube 111 and an inner tube 112 arranged in the outer tube 111, the lumen of the inner tube 112 is the liquid material channel 16, and the space between the inner tube 112 and the outer tube 111 is the gas channel 17; the liquid material nozzle 13 is an end port of the inner tube 112, and the liquid material nozzle 13 is located at an end port of the outer tube 111, and the gas nozzle 15 is arranged around the liquid material nozzle 13. Figure 3 By arranging the outer tube 111 and the inner tube 112 to form the liquid material channel 16, the gas channel 17, the liquid material nozzle 13 and the gas nozzle 15, not only is the assembly convenient, but also by arranging the gas nozzle 15 around the liquid material nozzle 13, the liquid material ejected from the liquid material nozzle 13 is fully cut in all directions by the gas ejected from the gas nozzle 15, thus facilitating the formation of smaller droplets.

[0153]

[0154] ​​For example, the space between the end of the outer tube 111 close to the liquid inlet 12 and the inner tube 112 is sealed, and an opening is formed on the wall of the outer tube 111. In this way, the liquid inlet 12 and the gas inlet 14 are separated, which not only facilitates the installation and connection of the liquid supply line 210 and the gas supply line, so as to respectively deliver liquid and air to the sprayer 10, but also reduces the probability of mutual influence during the delivery of liquid and air.

[0155] As shown in Figure 3 , Figure 8 and Figure 9 , Figure 8 is a structural schematic view of the sprayer 10 in Figure 1 from a perspective view, Figure 9 is a B-B sectional view of Figure 8 . In some embodiments, the outer side of the inner tube 112 is sleeved with a sleeve 113, the sleeve 113 is located at the end of the inner tube 112 where the liquid outlet 13 is arranged, the first end 1131 of the sleeve 113 is sealed with the outer tube 111, the second end 1132 of the sleeve 113 extends into the outer tube 111 and is sealed with the inner tube 112, and the gas outlet 15 is located at the first end 1131 of the sleeve 113 and is formed between the sleeve 113 and the inner tube 112; a plurality of gas holes 1130 are arranged on the circumferential wall of the sleeve 113 in the circumferential direction, and the plurality of gas holes 1130 are in communication with the liquid channel 16 and the gas channel 17.

[0156] By arranging a plurality of gas holes 1130 on the circumferential wall of the sleeve 113 in the circumferential direction, and the plurality of gas holes 1130 are in communication with the liquid channel 16 and the gas channel 17, a part of the air in the gas channel 17 enters the liquid channel 16 through the gas holes 1130, which increases the disturbance of the liquid in the liquid channel 16 during the flow process, and another part of the air is cut off from the gas outlet 15 through the gas channel 17, thereby facilitating the full cutting of the liquid.

[0157] As shown in Figure 9 , in some embodiments, each gas hole 1130 is an inclined hole, and the hole axis of the gas hole 1130 and the central axis of the sleeve 113 are non-coplanar straight lines; along the circumferential direction of the sleeve 113, the plurality of gas holes 1130 are arranged at intervals, and the inclined directions of each gas hole 1130 are the same.

[0158] The above-mentioned non-coplanar straight lines refer to two straight lines that are not in the same plane. The two non-coplanar straight lines are neither intersected nor parallel. The hole axis of the above-mentioned gas hole 1130 and the central axis of the sleeve 113 are non-coplanar straight lines, which means that the hole axis of each gas hole 1130 (the dashed line M in the plane as shown in Figure 9 ) and the central axis of the sleeve 113 (perpendicular to the plane as shown in Figure 9 , such as Figure 9The central axis of the gas hole 1130 corresponding to the center axis of the sleeve 113 is neither intersected nor parallel to the center axis of the sleeve 113.

[0159] As shown in FIG. 11, the central axis of the gas hole 1130 corresponding to the center axis of the sleeve 113 is neither intersected nor parallel to the center axis of the sleeve 113. Figure 9 As shown in FIG. 11, the central axis of the gas hole 1130 corresponding to the center axis of the sleeve 113 is neither intersected nor parallel to the center axis of the sleeve 113. Figure 9 The central axis of the gas hole 1130 corresponding to the center axis of the sleeve 113 is neither intersected nor parallel to the center axis of the sleeve 113.

[0160] By designing each gas hole 1130 as an inclined hole, the direction of the gas is changed, so that a part of the air enters the liquid material passage 16 through the gas hole 1130, and a vortex flow is formed at the communication between the gas passage 17 and the liquid material passage 16, thereby increasing the disturbance of the liquid material in the liquid material passage 16, and another part of the air cuts the liquid material through the gas passage 17. The plurality of gas holes 1130 are arranged at intervals along the circumference of the sleeve 113, thereby making the liquid material more uniformly dispersed, which is beneficial to obtaining more uniform granules.

[0161] As shown in FIG. 11, the central axis of the gas hole 1130 corresponding to the center axis of the sleeve 113 is neither intersected nor parallel to the center axis of the sleeve 113. Figure 9 As shown in FIG. 11, the central axis of the gas hole 1130 corresponding to the center axis of the sleeve 113 is neither intersected nor parallel to the center axis of the sleeve 113. Figure 9 As shown in FIG. 11, the central axis of the gas hole 1130 corresponding to the center axis of the sleeve 113 is neither intersected nor parallel to the center axis of the sleeve 113. Figure 9 As shown in FIG. 11, the central axis of the gas hole 1130 corresponding to the center axis of the sleeve 113 is neither intersected nor parallel to the center axis of the sleeve 113.

[0162] The inclination angle a of the hole axis of the gas hole 1130 relative to the center axis of the sleeve 113 is an important parameter in the design of the atomizer 10. When the inclination angle a is less than 15° or greater than 60°, the amount of air in the gas passage 17 entering the liquid material passage 16 is small, a vortex flow cannot be formed, and the amount of gas sprayed from the gas nozzle 15 is also reduced, so that the liquid material is not sufficiently cut, and the particle size does not meet the requirements. When the amount of gas is increased to form a vortex flow in the liquid material passage 16, the liquid material is sufficiently cut, the amount of gas sprayed from the gas nozzle 15 is also increased, and the particle size obtained is small, but air is also wasted.

[0163] By designing the inclination angle of the air holes 1130 to the above range, the air in the gas passage 17 can not only form a rotating vortex at the connection between the air holes 1130 and the liquid material passage 16 to increase the disturbance of the liquid material, but also the gas amount of the gas spout 15 can sufficiently cut the liquid material at the liquid material spout 13 to form particles with a required size, so as to achieve the purpose of considering the particle size and reducing the air amount.

[0164] As shown in Figure 9 , in some embodiments, the spacing between the two adjacent air holes 1130 is equal.

[0165] Through the above arrangement, the air uniformly enters the liquid material passage 16 through the plurality of air holes 1130, and the liquid material is uniformly cut by the gas, thereby facilitating the uniformity of the particles.

[0166] The equal spacing between the two adjacent air holes 1130 includes that the included angle formed by the axes of the two adjacent air holes 1130 is completely equal, and also includes that the included angle formed by the axes of the two adjacent air holes 1130 is approximately equal within a certain range, which is not specifically limited here.

[0167] As shown in Figure 3 , in some embodiments, the sleeve 113 has a tubular cavity 114 in the shape of a necking, and the gas spout 15 is located at the small end of the tubular cavity 114.

[0168] The above necking refers to that the cavity wall 51 of the tubular cavity 114 is arranged to be inclined along the axis of the sleeve 113, so that the sleeve 113 is generally funnel-shaped.

[0169] By arranging the gas spout 15 at the small end of the necking-shaped tubular cavity 114, the air converges to the gas spout 15 along the cavity wall 51 of the tubular cavity 114, which not only increases the speed of air ejection, but also makes the air ejected from the gas spout 15 to be inclined from the periphery to the center of the liquid material spout 13, thereby better cutting the liquid material to make the particles more uniform, thereby facilitating to obtain smaller particle size.

[0170] As shown in Figure 3 , in some embodiments, the outer tube 111 includes an outer tube body 1111 and a containing tube 1112, one end of the containing tube 1112 is detachably connected with the outer tube body 1111, the other end of the containing tube 1112 is provided with a mounting hole 1110, the first end 1131 of the sleeve 113 is adapted to extend into the mounting hole 1110, and the second end 1132 of the sleeve 113 extends into the containing tube 1112.

[0171] Through the above arrangement, the reliability of the connection between the outer tube 111 and the sleeve tube 113 is improved, and the accommodating tube 1112 is detachably connected with the outer tube body 1111, so that the disassembly, maintenance and replacement of the sleeve tube 113 and the outer tube 111 are facilitated.

[0172] As shown in Figure 3 some embodiments, the inner tube 112 includes an inner tube body 1121 and a nozzle tube 1122 detachably connected with the inner tube body 1121, the nozzle tube 1122 is arranged in the accommodating tube 1112, and a nozzle opening of the nozzle tube 1122 away from the inner tube body 1121 is the liquid material spray opening 13, and the sleeve tube 113 is sleeved on the nozzle tube 1122.

[0173] The inner tube body 1121 and the nozzle tube 1122 are connected in a detachable manner, so that the disassembly, maintenance and replacement of the inner tube 112 and the sleeve tube 113 are facilitated, and the sleeve tube 113 is sleeved on the nozzle tube 1122, thereby improving the strength of the connection between the sleeve tube 113 and the nozzle tube 1122 and the reliability of the sprayer 10.

[0174] The detachable connection includes clamping, screwing and the like, which are not limited here.

[0175] As shown in Figure 3 some embodiments, a connection flange 115 in the form of a ring is arranged on the peripheral wall of the inner tube 112, the connection flange 115 includes a matching portion 1151 and a stop portion 1152 arranged along the axial direction of the inner tube 112, the diameter of the stop portion 1152 is greater than that of the matching portion 1151, the matching portion 1151 is adapted to extend into the nozzle opening of the second end 1132 of the sleeve tube 113, and the stop portion 1152 is stopped at the edge of the nozzle opening of the second end 1132 of the sleeve tube 113.

[0176] Through the above arrangement, the connection flange 115 is in the form of a step, the matching portion 1151 is adapted to extend into the nozzle opening of the second end 1132 of the sleeve tube 113, the connection strength between the inner tube 112 and the sleeve tube 113 is improved, and the arrangement of the stop portion 1152 reduces the movement of the sleeve tube 113 along the axial direction of the outer tube 111 relative to the inner tube 112, so that the connection between the inner tube 112 and the sleeve tube 113 is firm.

[0177] As shown in Figure 3 some embodiments, a sealing member 60 is arranged at the connection between the inner tube body 1121 and the nozzle tube 1122 along the axial direction of the inner tube 112, and the sealing member 60 has a through hole 61 through which the liquid material passage 16 passes.

[0178] Through the arrangement of the sealing member 60, the sealing property of the connection between the inner tube body 1121 and the nozzle tube 1122 along the axial direction of the inner tube 112 is improved, and a certain buffering effect can be achieved under certain conditions.

[0179] The sealing member 60 can be made of elastic material, such as elastic sealing ring, etc. In this way, the sealing member 60 can play a certain buffering effect, and can compensate for the installation gap between the nozzle pipe 1122 and the inner pipe body 1121, thereby improving the connection reliability of the nozzle pipe 1122 and the inner pipe body 1121.

[0180] As shown in Figure 3 , Figure 8 and Figure 10 , Figure 10 is a C-C cross-sectional view of Figure 8 . In some embodiments, the outer pipe body 1111 is provided with a support member 40, which is arranged at the end of the outer pipe body 1111 and supports the outer pipe body 1111 and the inner pipe 112.

[0181] Since the outer pipe body 1111 is generally long strip-shaped, the support member 40 is arranged at the end of the outer pipe body 1111, so that the support member 40 provides the outer pipe 111 with a radial support force, thereby reducing the deformation of the outer pipe 111, making the connection between the outer pipe 111 and the inner pipe 112 more firm, and thereby facilitating the improvement of the reliability of the sprayer 10.

[0182] The long strip-shaped refers to that the axial dimension of the outer pipe body 1111 is greater than the radial dimension thereof.

[0183] As shown in Figure 3 , in some embodiments, the outer pipe body 1111 and the support member 40 can be an integral structure, which not only reduces the number of parts of the sprayer 10, but also improves the strength of the outer pipe 111.

[0184] The integral structure includes integrally formed or welded, bonded integral structure. When the outer pipe body 1111 and the support member 40 are both metal materials, they can be integrally formed by casting or integrally formed by welding, when one of them is a non-metal material, it can also be integrally formed by injection molding, or bonded, etc. Form an integral structure, which is not specifically limited here.

[0185] As shown in Figure 10 , in some embodiments, the support member 40 includes a plurality of support arms 41 arranged along the circumference of the inner pipe 112, and a space is formed between adjacent two support arms 41 for air to pass through.

[0186] Through the above arrangement, the support arm 41 can not only abut against the outer tube 111 and the inner tube 112 in the radial direction when the inner tube 112 or the outer tube 111 is deformed, thereby providing radial support force to the outer tube 111 and the inner tube 112, thereby reducing the deformation of the outer tube 111 and the inner tube 112 and improving the reliability of the sprayer 10, but also form a space for air to pass through, thereby achieving the purpose of both connecting the inner tube 112 and the outer tube 111 and conveying air.

[0187] For example, the support member 40 includes three support arms 41 arranged along the circumference of the inner tube 112 , and a space for air to pass through is formed between two adjacent support arms 41 , thereby forming three spaces for air to pass through along the circumference of the inner tube 112 .

[0188] like Figure 11 and Figure 12 As shown, Figure 11 This is a schematic diagram of the structure of the spray drying system provided in some embodiments of the present application. Figure 12 for Figure 11 Schematic diagram of the connection between the spray drying device 100 and the feeding system 200, the air supply system 300, and the drying system 400. The embodiment of the present application also provides a spray drying device 100, including a drying chamber 50 and the sprayer 10 of the above embodiment, the sprayer 10 being installed on the cavity wall 51 of the drying chamber 50.

[0189] In the spray drying device 100 of the embodiment of the present application, since the spray drying device 100 includes the sprayer 10 provided in the above embodiment, the spray drying device 100 also has the technical effects corresponding to the above sprayer 10, which will not be repeated here.

[0190] The sprayer 10 is mounted on the wall 51 of the drying chamber 50 by screwing or clamping the sprayer 10 to the wall 51 of the drying chamber 50, so that the liquid material nozzle 13 and the gas nozzle 15 of the sprayer 10 are located within the drying chamber 50. In this way, the liquid material is sprayed through the liquid material nozzle 13 and then atomized and dried in the drying chamber 50 in one step, which greatly improves the efficiency of spray granulation and facilitates the installation and maintenance of the sprayer 10.

[0191] The liquid enters the drying chamber 50 through the liquid nozzle 13 of the sprayer 10, beginning the spray granulation drying process. This process consists of three stages: liquid atomization, drying of the mist particles into pellets, and discharge of the granular powder. This one-step drying process allows all three stages to be completed within the drying chamber 50 by one operator using a single machine, resulting in high efficiency and energy conservation.

[0192] like Figure 12 As shown, in some embodiments, the chamber wall 51 of the drying chamber 50 includes a top wall and side walls, and the sprayer 10 is disposed on the top wall of the drying chamber 50 .

[0193] By arranging the sprayer 10 on the top wall of the drying chamber 50, the mist droplets sprayed from the liquid material nozzle 13 of the sprayer 10 are driven downward by the spiral hot air in the drying chamber 50, and the internal drying space of the drying chamber 50 is highly utilized.

[0194] In addition to being disposed on the top wall of the drying chamber 50 , the sprayer 10 may also be disposed on the side wall of the drying chamber 50 , which is not specifically limited herein.

[0195] like Figure 12 As shown, in some embodiments, there are multiple sprayers 10. For example, three sprayers 10 are provided on the chamber wall 51 of the drying chamber 50.

[0196] By arranging a plurality of sprayers 10 on the cavity wall 51 of the drying cavity 50, the spray granulation efficiency is improved.

[0197] Of course, the number of sprayers 10 may be two, four, five, or other numbers other than three. The sprayers 10 may be evenly arranged on the top wall of the drying chamber 50, or evenly arranged on the side walls of the drying chamber 50, or randomly arranged on the top wall or the side walls, and no specific limitation is made here.

[0198] like Figures 11-15 As shown, Figure 13 for Figure 11 A schematic structural diagram of the feeding system 200, Figure 14 for Figure 11 The structural diagram of the drying system 400 is shown in FIG. Figure 15 for Figure 11 Schematic diagram of the structure of the dust removal system 500 in the embodiment of the present application. The embodiment of the present application also provides a spray drying system, which includes a feeding system 200, an air supply system 300 and the spray drying device 100 in the above embodiment, wherein the feeding system 200 is connected to the liquid material inlet 12 of the sprayer 10, and the air supply system 300 is connected to the gas inlet 14 of the sprayer 10.

[0199] In the spray drying system of the embodiment of the present application, since the spray drying system includes the spray drying device 100 provided in the above embodiment, the spray drying system also has the technical effects corresponding to the above spray drying device 100, which will not be repeated here.

[0200] like Figure 11 and Figure 13As shown, in some embodiments, the feeding system 200 includes a feeding line 210, a material storage device 220 and a water storage device 230; one end of the feeding line 210 is connected to the material storage device 220, and the other end is connected to the liquid inlet 12 of the sprayer 10, and a delivery pump and a first control valve 1 are provided on the feeding line 210, and the first control valve 1 is arranged between the feeding pump and the material storage device 220; the water storage device 230 is connected to the feeding line 210 through a water supply line 250, and the water supply line 250 is connected between the feeding pump and the first control valve 1, and a second control valve 2 is provided on the water supply line.

[0201] The storage device 220 is mainly a device for storing liquid materials, and may be a stirring tank.

[0202] The water storage device 230 is mainly a device for storing water, and may be a water tank.

[0203] By arranging a water storage device 230 in the feeding system 200, the liquid material delivery and water delivery share the feeding line 210. When the spray drying device 100 is not in granulation operation, the water supply line 250 can be connected to the feeding line 210 of the original feeding system 200, so that the delivery pump can deliver the water in the water storage device 230 to the liquid material channel 16 of the sprayer 10. The water flowing through the liquid material channel 16 can flush and remove the liquid material and other residues in the liquid material channel 16, thereby ensuring that the liquid material channel 16 is clean. One feeding line 210 can be used to supply material to the sprayer 10 and clean the sprayer 10. In this way, only the water storage device 230 and the second control valve 2 for controlling the switching line need to be added to the original feeding system 200. This not only reduces the modification cost of the feeding system 200, which is beneficial to market promotion, but also saves the process of disassembling the sprayer 10 for cleaning, thereby reducing labor costs.

[0204] like Figure 11 and Figure 12 As shown, in some embodiments, the gas supply system 300 includes a first gas supply line 310 and a second gas supply line 320, the first gas supply line 310 is connected to the gas inlet 14, the second gas supply line 320 is connected to the liquid inlet 12, and a third control valve 3 is provided on the second gas supply line 320.

[0205] By setting up two gas supply lines, the opening and closing of the third control valve 3 can be controlled to realize the switching of delivering gas to the liquid channel 16 of the sprayer 10 to remove the liquid, water and other residues in the liquid channel 16; and delivering gas to the gas channel 17. In this way, the process of dismantling and cleaning the sprayer 10 is saved, which greatly saves labor costs.

[0206] It should be noted that the first gas supply line 310 and the second gas supply line 320 can be provided with air from the same gas source or different gas sources. Generally, the fourth control valve 9 is arranged on the first gas supply line 310. The switching of the first gas supply line 310 and the second gas supply line 320 is realized by controlling the third control valve 3 and the fourth control valve 9. The fourth control valve 9 can be used to adjust the pressure range of the first gas supply line 310 to 0.4-1.2 MPa, and the third control valve 3 can be used to adjust the pressure range of the second gas supply line 320 to 0.3-0.6 MPa. Generally, the internal pressure of the second gas supply line 320 is lower than that of the first gas supply line 310, so as to save the gas consumption.

[0207] As shown in Figure 13 some embodiments, the delivery pump includes a plunger pump 4 and a diaphragm pump 5, and the diaphragm pump 5 is arranged between the first control valve 1 and the plunger pump 4.

[0208] The plunger pump 4 is an important device of the hydraulic system. It relies on the reciprocating movement of the plunger in the cylinder to change the volume of the sealed working cavity to realize oil suction and oil pressing. The plunger pump 4 has the advantages of high rated pressure, compact structure, high efficiency, and convenient flow adjustment.

[0209] The diaphragm pump 5 is a special form of volumetric pump. It relies on the back and forth movement of a diaphragm to change the working chamber volume to suck and discharge liquid. The volumetric pump is a pump that uses the change of the volume of the pump cylinder to transport liquid.

[0210] The plunger pump 4 generates high pressure, which is used in cooperation with the diaphragm pump 5. In this way, the liquid material is extracted by the diaphragm pump 5 in the supply line 210 and delivered to the liquid material passage 16 of the sprayer 10 at a certain pressure.

[0211] As shown in Figure 13 some embodiments, the supply line 210 is further provided with a pulsation damper 6 and / or a back pressure valve 7. The pulsation damper 6 is arranged on the outlet side of the plunger pump 4, and the back pressure valve 7 is arranged on the outlet side of the plunger pump 4. For example, the supply line 210 is further provided with the pulsation damper 6 and the back pressure valve 7. The pulsation damper 6 is arranged on the outlet side of the plunger pump 4, and the back pressure valve 7 is arranged on the outlet side of the plunger pump 4.

[0212] The back pressure valve 7 is usually arranged at the outlet pipeline, such as at the connection between the feeding line 210 and the sprayer 10, for keeping a constant pressure at the outlet of the pump. Since self-flow or siphon phenomenon often occurs at the outlet of the plunger pump 4 due to gravity or other actions, the back pressure valve 7 arranged at the outlet side of the plunger pump 4 can reduce the fluctuation of flow and pressure caused by siphon, thereby being beneficial to keeping the pressure of the feeding line 210 stable.

[0213] The pulsation damper 6 is a pressure container for eliminating the pressure pulsation or flow pulsation of liquid in the pipeline, and can stabilize the fluid pressure and flow, eliminate pipeline vibration, protect downstream instruments and equipment, and increase the volumetric efficiency of the pump.

[0214] The outlet pressure of the plunger pump 4 can be adjusted by the back pressure valve 7, so as to keep the feeding line 210 at a constant pressure. By arranging the pulsation damper 6, the back pressure valve 7 and the pulsation damper 6 are used in cooperation, which not only reduces the influence of the self-pulsation of the plunger pump 4 on the output flow or pressure, but also slows down the impact of liquid flow.

[0215] Of course, only the pulsation damper 6 or the back pressure valve 7 can be arranged on the feeding line 210, which is not specifically limited herein.

[0216] As shown in FIG. 2, Figure 12 In some embodiments, the feeding line 210 is further provided with a manual valve 260, a pressure regulating valve 270 and a check valve 280.

[0217] The manual valve 260 is used for manually controlling the opening and closing of the feeding line 210, and is mainly used for maintenance.

[0218] The pressure regulating valve 270 is driven by receiving the signal of the industrial automatic control system to change the cross-sectional area between the valve core and the valve seat, control the flow, temperature, pressure and other process parameters of the pipeline medium, and mainly plays a role in automatically adjusting the pressure in the feeding line 210.

[0219] The check valve 280 is used for allowing the fluid (such as liquid and water) to flow only from the inlet to the outlet in one direction, but cannot flow back, and mainly plays a role in preventing the backflow of the fluid in the feeding line 210.

[0220] As shown in FIG. 2, Figure 13 In some embodiments, the feeding line 210 between the plunger pump 4 and the diaphragm pump 5 is provided with a de-ironer 8 and / or a first filter 240. For example, the feeding line 210 between the plunger pump 4 and the diaphragm pump 5 is provided with the de-ironer 8 and the first filter 240.

[0221] The de-ironer 8 is a device capable of generating strong magnetic field attraction force, which can remove ferromagnetic impurities mixed in the material to ensure the safe and normal operation of the mechanical equipment such as the crusher and the grinder in the conveying system, and can effectively reduce the probability of accidents caused by impurities, and can improve the quality and purity of the liquid material.

[0222] The first filter 240 is an indispensable device on the conveying medium pipeline (here, the feeding line 210 of the feeding system 200), which is usually installed at the inlet of the equipment such as the pressure reducing valve, the pressure relief valve, the constant level valve, and other equipment, and mainly plays the role of filtering the particulate impurities in the water or the liquid material.

[0223] By arranging the de-ironer 8 and the first filter 240 on the feeding line 210 between the plunger pump 4 and the diaphragm pump 5, the impurities in the liquid material, especially the metal impurities, can be filtered out, so that not only the purity of the liquid material is improved, but also the probability of accidents of the plunger pump 4 or the atomizer 10 caused by the impurities in the liquid material, especially the metal impurities, is reduced.

[0224] Of course, only the de-ironer 8 or the first filter 240 can be arranged on the feeding line 210 between the plunger pump 4 and the diaphragm pump 5, which is not limited herein.

[0225] As shown in FIG. 1, Figure 12 In some embodiments, the ratio of the air supply amount of the first air supply line 310 to the liquid material supply amount of the feeding line 210 to the atomizer 10 is in the range of 1-15.

[0226] The ratio of the air supply amount of the first air supply line 310 to the liquid material supply amount of the feeding line 210 to the atomizer 10 refers to that 1-15 cubic meters of air is consumed per liter of liquid material.

[0227] The ratio of the air supply amount to the liquid material supply amount is a main parameter for the atomizer 10 to spray and granulate. When the ratio is too small, that is, when the air supply amount consumed per liter of liquid material is less than 1 cubic meter, the liquid material cannot be sufficiently cut, and the particle size does not meet the requirements. When the ratio is too large, that is, when the air supply amount consumed per liter of liquid material is greater than 15 cubic meters, the particle size can meet the requirements, but air is wasted. By designing the ratio of the air supply amount to the liquid material supply amount in the above range, the liquid material can be sufficiently cut, so that the particle size meets the requirements, and air is not wasted, so that the particle size and the small amount of air are considered.

[0228] In some embodiments, the pressure ratio of the first air supply line 310 to the feeding line 210 is 0.6:3.5.

[0229] The pressure range of the first air supply line 310 is 0.1 MPa to 1.5 MPa, and the pressure range of the feed line 210 is 0.1 MPa to 5.0 MPa. The pressure ratio of the first air supply line 310 to the feed line 210 of 0.6:3.5 refers to the ratio of the pressure of the first air supply line 310 to the pressure of the feed line 210 when the pressure of the first air supply line 310 is 0.6 MPa and the pressure of the feed line 210 is 3.5 MPa. The pressure of the first air supply line 310 and the pressure of the feed line 210 are the main parameters of the spray granulation of the sprayer 10. How to reasonably set the pressure values ​​of the first air supply line 310 and the pressure values ​​of the feed line 210 and find the balance point of the ratio of the pressure of the first air supply line 310 to the pressure of the feed line 210 is the difficulty of spray granulation.

[0230] By designing the pressure ratio of the first gas supply line 310 to the pressure of the feed line 210 to be 0.6:3.5, the particle size obtained after passing through the sprayer 10 of the spray drying device 100 reaches the technical target of D50=3um-10um and the comprehensive indicators of D50≤8um and D90≤25um, which meets the requirements and is relatively uniform. At the same time, the gas consumption is small, thereby further achieving the purpose of taking into account both the particle size and the low gas consumption.

[0231] like Figure 11 and Figure 13 As shown, in some embodiments, the spray drying system also includes a drying system 400, which includes an air supply line 410, a heater 420, a first fan 430 and a second filter 440. One end of the air supply line 410 is connected to the second filter 440, and the other end is connected to the drying chamber 50. The first fan 430 and the heater 420 are arranged on the air supply line 410.

[0232] The heater 420 mainly heats the air.

[0233] The second filter 440 is mainly used to filter out impurities in the air.

[0234] The first fan 430 is an air supply fan that delivers air to the drying chamber 50 through the air supply line 410 .

[0235] The drying chamber 50 is connected to the drying system 400. In this way, after the liquid material is transported into the drying chamber 50 through the sprayer 10, the drying system 400 transports hot air into the drying chamber 50 to dry the droplets, so that the liquid material is formed into granules in the drying chamber 50 in one step.

[0236] like Figure 11 and Figure 13As shown, in some embodiments, the air supply line 410 is further provided with a third filter 450, which is arranged on the air outlet side of the heater 420.

[0237] Since metal oxides are prone to form on the inner wall of the heater 420 after the air is heated in the heater 420, by arranging the third filter 450 on the air outlet side of the heater 420, the impurities in the hot air, especially the metal oxide impurities formed in the heater 420, can be filtered out before the hot air enters the sprayer 10, thereby reducing the risk of short circuit of the sprayer 10 caused by the metal oxide impurities entering the sprayer 10, and further improving the reliability of the spray drying device 100.

[0238] As shown in Figure 11 and Figure 13 In some embodiments, the second filter 440 is a primary efficiency filter or a medium efficiency filter, and the third filter 450 is a high efficiency filter.

[0239] The primary efficiency filter is mainly used for filtering dust particles above 5um. The primary efficiency filter has three types of plate type, folding type and bag type, and the outer frame material has paper frame, aluminum frame and galvanized iron frame. The filter material has non-woven fabric, nylon net, activated carbon filter material and metal mesh, and the protective net has double-sided plastic-coated iron wire mesh and double-sided galvanized iron wire mesh.

[0240] The medium efficiency filter is mainly used for capturing 1um-5um particle dust and various suspended matters, and the filtering efficiency is 60%-95%. It can also be used as a front-end filter for high efficiency filtering to reduce the load of high efficiency filtering and prolong the service life.

[0241] The high efficiency filter is mainly used for capturing 0.5um or more particle dust and various suspended matters, and is used as the end filter of various filtering systems. The high efficiency filter uses ultra-fine glass fiber paper as filter material, folds the adhesive board paper and aluminum foil plate as partition plate, seals with new polyurethane sealant, and is made of galvanized sheet, stainless steel sheet and aluminum alloy profile as outer frame.

[0242] In the spray drying system of the embodiments of the present application, the air is preliminarily filtered before entering the heater 420 to remove the impurities in the air, and is secondarily filtered after passing through the heater 420. Since metal oxides are prone to form on the inner wall of the heater 420 after the air is heated in the heater 420, by using the third filter 450 as a high efficiency filter, comprehensive filtering can be performed before the hot air enters the sprayer 10 to filter out the impurities in the hot air, especially the metal oxide impurities formed in the heater 420, thereby reducing the risk of short circuit of the sprayer 10 caused by the metal oxide impurities entering the sprayer 10, and further improving the reliability of the spray drying device 100.

[0243] AsFigure 11 and Figure 15 As shown in FIG. 1, in some embodiments, the feeding system 200 further comprises a dust removal system 500 connected with the spray drying device 100, the dust removal system 500 comprising a cyclone separator 510, a bag filter 520, and a second fan 530.

[0244] The cyclone separator 510 is a device for separating a gas-solid system or a liquid-solid system. The working principle is that the rotation caused by the tangential introduction of the gas flow makes the solid particles or liquid droplets with large centrifugal force be thrown to the outer wall surface to be separated.

[0245] The bag filter 520, also known as a bag-type dust collector, is a dry dust filtering device. It is suitable for capturing fine, dry, and non-fibrous dust. The filter bag of the bag filter 520 is made of woven filter cloth or non-woven felt. The filter cloth is used to filter the dust-containing gas. When the dust-containing gas enters the bag filter, the dust with large particles and specific gravity is settled down due to the action of gravity and falls into the ash hopper. The gas containing fine dust is filtered through the filter material, and the dust is blocked, so that the gas is purified.

[0246] The second fan 530 is an exhaust fan, which mainly sucks the fine particles in the drying chamber 50 together with the drying air out of the drying chamber 50 into the device outside. The second fan 530 can be a centrifugal fan.

[0247] The fine particles in the drying chamber 50 are transported together with the drying air into the cyclone separator 510. After effective separation by the cyclone separator 510, the fine particles enter the collection cylinder at the bottom of the separator for recycling. The remaining waste gas containing a small amount of fine particles is sucked into the dust collector by the second fan 530 for further dust removal and collection. The waste gas after harmless treatment is discharged from the chimney, thereby reducing the pollution to the environment.

[0248] The application also provides a control method of the spray drying system, which comprises closing the first control valve 1 and opening the second control valve 2 after the spray drying device 100 completes the drying and granulation of the liquid material, so that the water in the water storage device 230 is transported to the liquid material channel 16 of the sprayer 10 through the feeding line 210 by the delivery pump. After a preset time, the delivery pump is closed.

[0249] After the liquid material is dried and granulated in the spray drying device 100, the above steps can be used to flush the liquid material and other residues in the liquid material channel 16 of the sprayer 10 by the water in the water storage device 230 through the original feed line 210 of the feed system 200 when the spray drying device 100 is not working for granulation, so as to ensure the cleanliness of the liquid material channel 16. In this way, only the water storage device 230 and the second control valve 2 for switching the feed line 210 need to be added to the original feed system 200, the cost of modifying the feed system 200 is small, and the process of disassembling the sprayer 10 for cleaning is saved, thereby reducing the labor cost.

[0250] In some embodiments, after the delivery pump is turned off, the third control valve 3 is opened, and the gas in the second gas supply line 320 enters the liquid material channel 16 of the sprayer 10.

[0251] The above steps are added after the delivery pump is turned off, so that the gas in the liquid material channel 16 of the sprayer 10 can be delivered through the sprayer 10 when the spray drying device 100 is not working for granulation, and the liquid material, water and other residues in the liquid material channel 16 can be removed, so that the liquid material channel 16 of the sprayer 10 remains clean and dry. In this way, on the basis of saving the process of disassembling the sprayer 10 for cleaning, the liquid material channel 16 remains clean and dry, which is beneficial to prolong the service life of the sprayer 10.

[0252] As shown in FIG. 1, Figures 1-5 In one embodiment, the sprayer 10 includes a sprayer body 11, and the sprayer body 11 is provided with a liquid material inlet 12, a liquid material nozzle 13, a gas inlet 14, a gas nozzle 15, a liquid material channel 16 and a gas channel 17. The liquid material nozzle 13 and the liquid material inlet 12 are in communication with the liquid material channel 16, the gas nozzle 15 and the gas inlet 14 are in communication with the gas channel 17, the gas nozzle 15 is arranged at the liquid material nozzle 13, the dispersing member 20 is arranged in the liquid material channel 16, the dispersing member 20 is in clearance fit with the inner wall of the liquid material channel 16, the dispersing member 20 is arranged at the liquid material nozzle 13, and the dispersing member 20 divides the liquid material channel 16 into a plurality of sub-channels in communication with the liquid material nozzle 13.

[0253] In the sprayer 10 of the embodiment of the present application, the liquid material outlet 13 and the liquid material inlet 12 are both connected with the liquid material channel 16, the gas outlet 15 and the gas inlet 14 are both connected with the gas channel 17, the gas outlet 15 is arranged at the liquid material outlet 13, and the dispersing member 20 is arranged in the liquid material channel 16. In this way, the liquid material is first dispersed by the dispersing member 20 in the liquid material channel 16, and then the liquid material sprayed out of the liquid material outlet 13 is sheared and mixed with the gas sprayed out of the gas outlet 15 at the liquid material outlet 13, so that the liquid material is physically broken and atomized to form tiny mist droplets by the gas, the tiny mist droplets are spherically shaped due to the surface tension, and the tiny mist droplets are rapidly evaporated and dried under the action of the hot gas flow due to the large surface area of the tiny mist droplets, and finally shrink to form dry small-diameter spherical granular powder.

[0254] As shown in Figures 3-5 , the dispersing member 20 includes a prismatic segment 21 and an abutting column segment 22, the abutting column segment 22 is located on the side of the prismatic segment 21 facing the nozzle member 30, the side wall of the abutting column segment 22 is provided with two communication grooves 23 which are arranged in an inclined manner with respect to the axial direction of the abutting column segment 22, each of the communication grooves 23 is connected with the spray hole 31 and at least one sub-channel, the prismatic segment 21 includes a first prismatic segment 211 and a second prismatic segment 212 which are connected with each other, the first prismatic segment 211 has a larger circumscribed circle radius of the cross section than the second prismatic segment 212, and the first prismatic segment 211 is located on the side of the second prismatic segment 212 facing the liquid material outlet 13.

[0255] As shown in Figure 3 , the spray hole 31 includes a tapered hole segment 311 and a cylindrical hole segment 312, the cylindrical hole segment 312 is connected with the small opening end 3111 of the tapered hole segment 311, the large opening end 3112 of the tapered hole segment 311 is arranged to allow the abutting column segment 22 to extend into, and one end of the communication groove 23 penetrates through the abutting column segment 22 and is connected with the tapered hole segment 311.

[0256] As shown in Figure 3 , Figure 6 and Figure 7 , the liquid material outlet 13 is provided with the nozzle member 30, the nozzle member 30 is in interference fit with the liquid material channel 16, the nozzle member 30 is located on the side of the dispersing member 20 facing the liquid material outlet 13, and the peripheral edge of the nozzle member 30 is in sealing connection with the inner wall of the liquid material channel 16, the nozzle member 30 is provided with the spray hole 31, and the spray hole 31 is connected with each of the sub-channels.

[0257] As shown in Figure 3 , the annular flange arranged at one end of the liquid material channel 16 forms a limiting portion 32, the limiting portion 32 is used to prevent the nozzle member 30 from being removed from the liquid material outlet 13, the center hole of the annular flange has a diameter smaller than the maximum diameter of the nozzle member 30, and the center hole of the annular flange is the liquid material outlet 13.

[0258] As shown in Figure 3As shown, the sprayer body 11 comprises an outer tube 111 and an inner tube 112 arranged in the outer tube 111, the outer tube 111 comprises an outer tube body 1111 and a containing tube 1112, one end of the containing tube 1112 is detachably connected with the outer tube body 1111, the other end of the containing tube 1112 is provided with a mounting hole 1110, the first end 1131 of the sleeve 113 is adapted to extend into the mounting hole 1110, the second end 1132 of the sleeve 113 extends into the containing tube 1112, the inner tube 112 comprises an inner tube body 1121 and a nozzle tube 1122 detachably connected with the inner tube body 1121, the nozzle tube 1122 is arranged in the containing tube 1112, the nozzle tube 1122 is provided with a liquid material spray port 13 away from the inner tube body 1121, the sleeve 113 is sleeved on the nozzle tube 1122, so that the gas spray port 15 is arranged around the liquid material spray port 13, the sleeve 113 is located at one end of the inner tube 112 where the liquid material spray port 13 is arranged, the first end 1131 of the sleeve 113 is sealingly connected with the outer tube 111, the second end 1132 of the sleeve 113 extends into the outer tube 111 and is sealingly connected with the inner tube 112, the sleeve 113 has a tubular cavity 114 in the shape of a neck, the gas spray port 15 is located at the small end of the tubular cavity 114, so that the gas spray port 15 is located at the first end 1131 of the sleeve 113 and is formed between the sleeve 113 and the inner tube 112; a plurality of gas holes 1130 are arranged on the peripheral wall of the sleeve 113 in the circumferential direction, and the plurality of gas holes 1130 are in communication with the liquid material channel 16 and the gas channel 17.

[0259] As shown in Figure 3 , the peripheral wall of the inner tube 112 is provided with a ring-shaped connecting flange 115, the connecting flange 115 comprises a matching portion 1151 and a stop portion 1152 arranged in the axial direction of the inner tube 112, the diameter of the stop portion 1152 is greater than the diameter of the matching portion 1151, the matching portion 1151 is adapted to extend into the nozzle port of the second end 1132 of the sleeve 113, and the stop portion 1152 is stopped at the edge of the nozzle port of the second end 1132 of the sleeve 113, a sealing member 60 is arranged at the axial connection between the inner tube body 1121 and the nozzle tube 1122 of the inner tube 112, and the sealing member 60 has a through hole 61 for the liquid material channel 16 to pass through.

[0260] As shown in Figure 9 , the spacing between adjacent two gas holes 1130 is equal, each gas hole 1130 is an inclined hole, and the hole axis of the gas hole 1130 and the central axis of the sleeve 113 are non-coplanar straight lines; along the circumferential direction of the sleeve 113, the inclination direction of each gas hole 1130 is the same, and the inclination angle of the hole axis of the gas hole 1130 relative to the central axis of the sleeve 113 ranges from 15° to 60°. Taking the gas hole 1130 corresponding to the central axis indicated by the dashed line M in the plane as shown in Figure 9 , as an example, one end of the central axis of the gas hole 1130 close to the central axis of the sleeve 113 is opposite to the central axis of the sleeve 113 (as shown in Figure 9the center point of the sleeve 113) is offset to one side, and the same refers to the fact that the central axis of each of the plurality of air holes 1130 is offset to the same side; the inclination angle of the air hole 1130 refers to the acute angle between the hole axis of the air hole 1130 and the first normal (as shown by the dashed line N in the plane Figure 9 , and the acute angle between the hole axis of the air hole 1130 and the first normal (as shown by the dashed line N in the plane Figure 9 , and the acute angle between the hole axis of the air hole 1130 and the first normal (as shown by the dashed line N in the plane

[0261] As shown in Figure 3 , Figure 8 , and Figure 10 , the outer tube body 1111 is integrally connected with a support 40, which is arranged at the end of the outer tube body 1111 and supports the outer tube body 1111 and the inner tube 112, and the support 40 includes three support arms 41 arranged along the circumference of the inner tube 112, and a space for air to pass through is formed between two adjacent support arms 41.

[0262] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered in the scope of the claims and the specification of the present application. In particular, each of the technical features mentioned in the embodiments can be combined in any manner without structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A sprayer, characterized in that: The sprayer comprises a sprayer body, wherein the sprayer body is provided with a liquid inlet, a liquid nozzle, a gas inlet, a gas nozzle, a liquid channel and a gas channel, wherein the liquid nozzle and the liquid inlet are both connected to the liquid channel, the gas nozzle and the gas inlet are both connected to the gas channel, and the gas nozzle is arranged at the liquid nozzle; a dispersion member is provided in the liquid channel, the dispersion member is arranged at the liquid nozzle, and the dispersion member divides the liquid channel into a plurality of sub-channels connected to the liquid nozzle; The sprayer body includes an outer tube and an inner tube passing through the outer tube, the lumen of the inner tube is the liquid channel, and the space between the inner tube and the outer tube is the gas channel; the liquid nozzle is an end of the inner tube, and the liquid nozzle is located at the end of the outer tube, and the gas nozzle is arranged around the liquid nozzle; A sleeve is provided on the outer side of the inner tube, and the sleeve is located at one end of the inner tube where the liquid material nozzle is provided. The first end of the sleeve is sealed with the outer tube, and the second end of the sleeve extends into the outer tube and is sealed with the inner tube. The gas nozzle is located at the first end of the sleeve and is formed between the sleeve and the inner tube; a plurality of air holes are provided on the peripheral wall of the sleeve along the circumferential direction, and the plurality of air holes are all connected with the gas nozzle and the gas channel.

2. The sprayer according to claim 1, characterized in that Each of the air holes is an oblique hole, and the hole axis of the air hole and the center axis of the sleeve are skew straight lines; along the circumference of the sleeve, a plurality of the air holes are arranged at intervals.

3. The sprayer according to claim 2, characterized in that The inclination angle of the axis of the air hole relative to the central axis of the sleeve is in the range of 15° to 60°.

4. The sprayer according to claim 3, characterized in that The distances between two adjacent air holes are equal.

5. The sprayer according to claim 4, characterized in that The sleeve has a constricted lumen, and the gas nozzle is located at the small end of the lumen.

6. The sprayer according to claim 5, characterized in that The outer tube includes an outer tube body and a accommodating tube, one end of the accommodating tube is detachably connected to the outer tube body, and the other end of the accommodating tube is provided with a mounting hole, the first end of the sleeve is adapted to extend into the mounting hole, and the second end of the sleeve extends into the accommodating tube.

7. The sprayer according to claim 6, characterized in that The inner tube includes an inner tube body and a nozzle tube detachably connected to the inner tube body. The nozzle tube is arranged in the accommodating tube. The nozzle tube orifice away from the inner tube body is the liquid material nozzle. The sleeve is sleeved on the nozzle tube.

8. The sprayer according to claim 7, characterized in that An annular connecting flange is provided on the peripheral wall of the inner tube, and the connecting flange includes a matching portion and a stop portion arranged along the axial direction of the inner tube. The diameter of the stop portion is larger than the diameter of the matching portion. The matching portion is adapted to extend into the pipe opening of the second end of the sleeve, and the stop portion stops at the edge of the pipe opening of the second end of the sleeve.

9. The sprayer according to claim 8, characterized in that A support member is provided in the outer tube body. The support member is arranged at the end of the outer tube body and supported between the outer tube body and the inner tube.

10. The sprayer according to claim 9, characterized in that The support member includes a plurality of support arms arranged along the circumference of the inner tube, and a space for air to pass through is formed between two adjacent support arms.

11. A spray drying device, characterized in that: The invention comprises a drying chamber and the sprayer according to any one of claims 1 to 10, wherein the sprayer is installed on the wall of the drying chamber.

12. A spray drying system, characterized in that: It comprises a feeding system, an air supply system and the spray drying device according to claim 11, wherein the feeding system is connected to the liquid material inlet of the sprayer, and the air supply system is connected to the gas inlet of the sprayer.

13. The spray drying system according to claim 12, characterized in that The feeding system includes a feeding line, a material storage device and a water storage device; One end of the feed line is in communication with the material storage device, and the other end is in communication with the liquid material inlet of the sprayer. A delivery pump and a first control valve are provided on the feed line, and the first control valve is provided between the delivery pump and the material storage device. The water storage device is connected to the material supply line through a water supply line, and the water supply line is connected between the delivery pump and the first control valve. A second control valve is provided on the water supply line.

14. The spray drying system according to claim 13, characterized in that The gas supply system includes a first gas supply line and a second gas supply line. The first gas supply line is connected to the gas inlet, the second gas supply line is connected to the liquid material inlet, and a third control valve is provided on the second gas supply line.

15. The spray drying system according to claim 14, characterized in that The delivery pump includes a plunger pump and a diaphragm pump, and the diaphragm pump is arranged between the first control valve and the plunger pump.

16. The spray drying system according to claim 15, characterized in that The feed line is further provided with a pulsation damper and / or a back pressure valve. The pulsation damper is arranged on the outlet side of the plunger pump, and the back pressure valve is arranged on the outlet side of the plunger pump.

17. The spray drying system according to claim 16, characterized in that An iron remover and / or a first filter is provided on the feed line between the plunger pump and the diaphragm pump.

18. The spray drying system according to claim 17, characterized in that The ratio of the amount of gas supplied by the first gas supply line to the sprayer to the amount of material supplied by the material supply line to the sprayer ranges from 1 to 15.

19. The spray drying system according to claim 18, characterized in that The pressure ratio of the first gas supply line to the material supply line is 0.6:3.

5.

20. The spray drying system according to claim 19, characterized in that The spray drying system also includes a drying system, which includes an air supply line, a heater, a first fan and a second filter. One end of the air supply line is connected to the second filter, and the other end is connected to the drying chamber. The first fan and the heater are arranged on the air supply line.

21. The spray drying system according to claim 20, characterized in that The air supply line is further provided with a third filter, and the third filter is arranged on the air outlet side of the heater.

22. The spray drying system according to claim 21, characterized in that The second filter is a primary filter or a medium efficiency filter, and the third filter is a high efficiency filter.

23. A control method for the spray drying system according to any one of claims 14 to 20, characterized in that: The method comprises: after the spray drying device completes drying and granulating the liquid material, closing the first control valve, opening the second control valve, and allowing the delivery pump to deliver water in the water storage device to the liquid material channel of the sprayer through the supply line; and closing the delivery pump after a preset time.

24. The control method of the spray drying system according to claim 23, characterized in that: After closing the delivery pump, the method further includes: opening a third control valve to allow the gas in the second gas supply line to enter the liquid material channel of the sprayer.

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