Sprayer, spray drying device, spray drying system, and control method thereof

Abstract

The present application discloses an atomizer (10), a spray drying device (100), a spray drying system (400) and a control method thereof. The atomizer (10) includes an atomizer body (11), and a liquid material inlet (12), a liquid material outlet (13), a gas inlet (14), a gas outlet (15), a liquid material passage (16) and a gas passage (17) are provided in the atomizer body (11). The liquid material outlet (13) and the liquid material inlet (12) are both in communication with the liquid material passage (16), and the gas outlet (15) and the gas inlet (14) are both in communication with the gas passage (17). The gas outlet (15) is installed at the liquid material outlet (13), and a dispersion member (20) is provided in the liquid material passage (16). The dispersion member (20) is installed at the liquid material outlet (13), and the dispersion member (20) divides the liquid material passage (16) into a plurality of sub-passages (160) communicating with the liquid material outlet (13). The particle powder material produced by this atomizer (10) can meet the particle size standard requirements.

Description

Technical Field

[0001] This application relates to the technical field of spray granulation, and specifically to atomizers, spray drying devices, spray drying systems, and their control methods.

[0002] Cross-reference to Related Applications This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on May 19, 2023, with the application number 202310568410.5 and the invention title "Atomizer, Spray Drying Device, Spray Drying System, and Their Control Methods", and all of its content is incorporated into this application by reference.

Background Art

[0003] Spray granulation is a granulation method in which a powder slurry or solution is sprayed into a granulation tower and dried and agglomerated under the action of hot spray air to obtain spherical agglomerates. This method is widely used in the production of catalysts of various particle size sizes or other particles with requirements for particle size. In the production process of spray granulation drying, the finally produced particle sizes are different.

[0004] In the related art, spray drying devices generally adopt centrifugal atomization drying for granulation, that is, due to the high-speed rotation of the atomization disk, a slurry with a solid content of 5%-50% is rapidly shaken out from the atomization disk to form fine droplets. At this time, clean air heated by a heater completes heat exchange in the main spray tower to achieve the purpose of drying and granulating the material. The particle size of the particle powder material produced by such a granulation method is mainly affected by the rotation speed of the atomization disk, and it is impossible to produce a particle powder material with a small particle size.

Summary of the Invention

[0005] The purpose of the embodiments of this application is to provide an atomizer, a spray drying device, a spray drying system, and their control methods, including but not limited to solving the problem that it is impossible to produce a particle powder material with a small particle size.

[0006] The technical solution adopted in the embodiments of this application is as follows.

[0007] According to a first aspect, an embodiment of this application provides an atomizer, which includes an atomizer body, and a liquid material inlet, a liquid material outlet, a gas inlet, a gas outlet, a liquid material passage, and a gas passage are provided in the atomizer body. The liquid material outlet and the liquid material inlet both communicate with the liquid material passage, the gas outlet and the gas inlet both communicate with the gas passage, and the gas outlet is installed at the liquid material outlet.

[0008] In the technical solution of the embodiment of this application, both the liquid material outlet and the liquid material inlet are communicated with the liquid material passage, both the gas outlet and the gas inlet are communicated with the gas passage, and the gas outlet is installed at the liquid material outlet. Thereby, the liquid material ejected from the liquid material outlet and the gas ejected from the gas outlet are sheared and mixed at the liquid material outlet, so that the liquid material is physically broken up by the gas to form an atomized fine mist droplet. The fine mist droplet forms a spherical shape under the action of surface tension. Since the mist droplet has a very large surface area, the moisture rapidly evaporates and dries under the action of the hot air flow, and finally shrinks to form a dried spherical particle powder material with a relatively small diameter.

[0009] In some embodiments, a dispersion member is provided in the liquid material passage. The dispersion member is installed at the liquid material outlet, and the dispersion member divides the liquid material passage into a plurality of sub-passages communicating with the liquid material outlet.

[0010] In the atomizer of the embodiment of this application, when the liquid material flows through the dispersion member, it is divided by the dispersion member, which is beneficial to forming smaller mist droplets at the liquid material outlet.

[0011] In some embodiments, a plurality of sub-passages are formed between the outer surface of the dispersion member and the inner wall of the liquid material passage.

[0012] In the atomizer of the embodiment of the present application, thereby, when the liquid material flows through the dispersion member, it flows into the liquid material ejection port via a plurality of sub-passages, and the liquid material is dispersed in the liquid material passage, which is advantageous for forming smaller droplets at the liquid material ejection port.

[0013] In some embodiments, the dispersion member includes a prismatic segment, and sub-passages are respectively formed between each side wall of the prismatic segment and the inner wall of the liquid material passage.

[0014] In the atomizer of the embodiment of the present application, thereby, when the liquid material flows through the dispersion member, it is segmented by the side edge between two adjacent side walls of the dispersion member, which is advantageous for forming smaller droplets at the liquid material ejection port.

[0015] In some embodiments, the prismatic segment includes a first prismatic segment and a second prismatic segment that are connected. The radius of the circumscribed circle of the cross-section of the first prismatic segment is larger than the radius of the circumscribed circle of the cross-section of the second prismatic segment, and the first prismatic segment is located on the side facing the liquid material ejection port of the second prismatic segment.

[0016] In the atomizer of the embodiment of the present application, thereby, by changing the flow rate of the liquid material in the liquid material passage and ejecting the liquid material from the liquid material ejection port at a certain angle, it is advantageous for forming smaller droplets at the liquid material ejection port.

[0017] In some embodiments, an ejection port member is provided at the liquid material ejection port. The ejection port member is located on the side facing the liquid material ejection port of the dispersion member, and the periphery of the ejection port member is hermetically connected to the inner wall of the liquid material passage. An ejection hole is provided in the ejection port member, and the ejection hole communicates with each sub-passage.

[0018] In the atomizer of the embodiment of the present application, it is advantageous to eject the liquid material from the ejection hole at a high speed and improve the speed at which the liquid material is ejected from the liquid material ejection port, thereby forming smaller droplets.

[0019] In some embodiments, the dispersion member is loosely fitted with the inner wall of the liquid material passage. The dispersion member includes abutting column segments, which are located on the side facing the nozzle member of the prismatic segment. A plurality of communication grooves are provided on the side walls of the abutting column segments, and each communication groove communicates with the ejection hole and at least one sub-passage.

[0020] In the atomizer according to the embodiment of the present application, when the liquid material flows through the dispersion member, it is segmented and dispersed by the communication grooves, which is advantageous for forming smaller droplets at the liquid material ejection port.

[0021] In some embodiments, the communication grooves are installed obliquely with respect to the axial direction of the abutting column segments.

[0022] In the atomizer according to the embodiment of the present application, by changing the flow direction of the liquid material in the liquid material passage, a rotating vortex is formed, which is further advantageous for the liquid material to be segmented and dispersed.

[0023] In some embodiments, the ejection hole includes a tapered hole segment and a columnar hole segment. The columnar hole segment is connected to the small end of the tapered hole segment. The large end of the tapered hole segment is insertable with the abutting column segment, and one end of the communication groove penetrates the end facing the nozzle member of the abutting column segment and communicates with the tapered hole segment.

[0024] In the atomizer according to the embodiment of the present application, by ejecting gas from the ejection hole at a high speed in a spiral manner, the flow direction of the liquid material is changed, which is advantageous for the liquid material to be segmented and dispersed by the air.

[0025] In some embodiments, the nozzle member is press-fitted with the liquid material passage.

[0026] In the atomizer according to the embodiment of the present application, thereby reducing the probability that the nozzle member is ejected from the liquid material ejection port.

[0027] In some embodiments, a position limiting portion is provided on a side of the dispersion member of the nozzle member away from the liquid material nozzle, and the position limiting portion is used to prevent the nozzle member from exiting the liquid material nozzle.

[0028] In the atomizer according to the embodiment of the present application, thereby reducing the probability that the nozzle member is ejected from the liquid material nozzle.

[0029] In some embodiments, the position limiting portion is an annular flange installed 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 nozzle member, and the central hole of the annular flange is the liquid material nozzle.

[0030] In the atomizer according to the embodiment of the present application, the position limiting portion reduces the probability that the nozzle member is ejected from the liquid material nozzle, and by reducing the diameter of the liquid material nozzle, it is advantageous for obtaining particulate material with a smaller particle size.

[0031] In some embodiments, the atomizer body includes an outer tube and an inner tube drilled inside the outer tube. The cavity of the inner tube is the liquid material passage, the space between the inner tube and the outer tube is the gas passage, the liquid material nozzle is the nozzle opening at one end of the inner tube, and the liquid material nozzle is located at the nozzle opening at one end of the outer tube. The gas nozzle is installed surrounding the liquid material nozzle.

[0032] In the atomizer according to the embodiment of the present application, by installing the gas nozzle surrounding the liquid material nozzle, the liquid material ejected from the liquid material nozzle is sufficiently segmented in all directions by the gas ejected from the gas nozzle, which is advantageous for forming smaller droplets.

[0033] In some embodiments, a sleeve is externally fitted outside the inner tube. The sleeve is located at the end where the liquid material ejection port of the inner tube is installed. The first end of the sleeve is sealingly connected to the outer tube, and the second end of the sleeve is inserted into the outer tube and sealingly connected to the inner tube. The gas ejection port 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 provided along the circumferential direction on the circumferential wall of the sleeve, and all of the plurality of gas holes communicate with the liquid material passage and the gas passage.

[0034] In the atomizer according to the embodiment of the present application, a plurality of gas holes are provided along the circumferential direction on the circumferential wall of the sleeve, and all of the plurality of gas holes communicate with the liquid material passage and the gas passage. In this way, by increasing the turbulence during the flow of the liquid material in the liquid material passage, it is beneficial for the liquid material to be sufficiently segmented.

[0035] In some embodiments, each gas hole is an inclined hole, and the hole axis of the inclined hole and the central axis of the sleeve are straight lines in different planes from each other. The plurality of gas holes are arranged at intervals along the circumferential direction of the sleeve, and the inclination direction of each gas hole is the same.

[0036] In the atomizer according to the embodiment of the present application, thereby, by changing the direction of the gas, a swirling flow is formed, which is beneficial for the liquid material to be segmented.

[0037] In some embodiments, the range of the inclination angle of the hole axis of the gas hole with respect to the central axis of the sleeve is 15° to 60°. Here, the inclination angle is an acute angle sandwiched between the hole axis of the gas hole and the first normal line, and the first normal line is the normal line at the intersection of the cylindrical surface where the outer peripheral surface of the sleeve is located and the hole axis of the gas hole.

[0038] In the atomizer according to the embodiment of the present application, thereby, the purpose of achieving both the size and uniformity of the particulate material can be achieved.

[0039] In some embodiments, the pitch between two adjacent gas holes is equal.

[0040] In the atomizer according to the embodiment of the present application, thereby, the liquid material is uniformly cut by the gas, which is advantageous for the uniformity of the particle material.

[0041] In some embodiments, the sleeve has a tapered tube cavity, and the gas outlet is located at the small end of the tube cavity.

[0042] In the atomizer according to the embodiment of the present application, thereby, by changing the gas ejection direction, the liquid material is cut better.

[0043] In some embodiments, the outer tube includes an outer tube body and a receiving tube. One end of the receiving tube is detachably connected to the outer tube body. An attachment hole is provided at the other end of the receiving tube. The first end of the sleeve is inserted into the attachment hole in a fitting manner, and the second end of the sleeve is inserted into the receiving tube.

[0044] In the atomizer according to the embodiment of the present application, thereby, it is advantageous to improve the reliability of the connection between the outer tube and the sleeve.

[0045] In some embodiments, the inner tube includes an inner tube body and an ejection header tube detachably connected to the inner tube body. The ejection header tube is installed in the receiving tube. The tube orifice of the ejection header tube away from the inner tube body is the liquid material ejection port, and the sleeve is externally fitted to the ejection header tube.

[0046] In the atomizer according to the embodiment of the present application, thereby, it facilitates the detachment inspection of the atomizer and improves the strength of the connection between the sleeve and the ejection header tube.

[0047] In some embodiments, an annular connection flange is provided on the peripheral wall of the inner tube. The connection flange includes a fitting portion and a stopper portion arranged along the axial direction of the inner tube. The diameter of the stopper portion is larger than that of the fitting portion. The fitting portion is inserted into the tube orifice at the second end of the sleeve in a fitting manner, and the stopper portion is stoppered at the edge of the tube orifice at the second end of the sleeve.

[0048] In the atomizer according to the embodiment of the present application, thereby firmly connecting the inner tube and the sleeve.

[0049] In some embodiments, a support member is provided inside the outer tube body, and the support member is installed at the end of the outer tube body and supports between the outer tube body and the inner tube.

[0050] In the atomizer according to the embodiment of the present application, by installing the support member, by improving the strength of the connection portion between the outer tube and the inner tube, the deformation of the outer tube is reduced, and thereby it is advantageous to improve the reliability of the atomizer.

[0051] In some embodiments, the support member includes a plurality of support arms arranged along the circumferential direction of the inner tube, and a space through which air can pass is formed between two adjacent support arms.

[0052] In the atomizer according to the embodiment of the present application, thereby the support member can achieve the purpose of combining the function of connecting the inner tube and the outer tube and air transportation.

[0053] According to a second aspect, the embodiment of the present application further provides a spray drying device, and this spray drying device includes a drying cavity and the atomizer according to the embodiment of the first aspect, and the atomizer is attached to the cavity wall of the drying cavity.

[0054] In the spray drying device according to the embodiment of the present application, since this spray drying device includes the atomizer according to the first aspect, this spray drying device has the technical effects corresponding to the aforementioned atomizer, and will not be described further here.

[0055] According to a third aspect, the embodiment of the present application further provides a spray drying system, and this spray drying system includes a material supply system, a gas supply system, and the spray drying device according to the embodiment of the second aspect, the material supply system communicates with the liquid material inlet of the atomizer, and the gas supply system communicates with the gas inlet of the atomizer.

[0056] In the spray drying system of the embodiment of the present application, since this spray drying system includes a spray drying device according to the above second aspect, this spray drying system has the technical effects corresponding to the aforementioned spray drying device, and will not be described further herein.

[0057] In some embodiments, the material supply system includes a material supply line, a material storage device, and a water storage device. One end of the material supply line communicates with the material storage device, and the other end communicates with the liquid material inlet of the atomizer. A transport pump and a first control valve are provided in the material supply line. The first control valve is installed between the transport pump and the material storage device. The water storage device is connected to the material supply line via a water supply line, and the water supply line is connected between the transport pump and the first control valve. A second control valve is provided in the water supply line.

[0058] In the spray drying system of the embodiment of the present application, the liquid material transport and the water transport share one material supply line. Thereby, by controlling the first control valve, the supply and stop of the liquid material can be realized, and by controlling the switching between the first control valve and the second control valve, water can be transported into the liquid material passage of the atomizer, thereby cleaning the liquid material passage, or by transporting the liquid material into the liquid material passage of the atomizer, spray granulation can be realized. The material supply and cleaning are realized by one material supply line, saving the transformation cost, being advantageous for popularization in the market, and saving labor costs by omitting the process of removing and cleaning the atomizer.

[0059] In some embodiments, the gas supply system includes a first gas supply line and a second gas supply line. The first gas supply line communicates with the gas inlet, and the second gas supply line communicates with the liquid material inlet. A third control valve is provided in the second gas supply line.

[0060] In the spray drying system according to the embodiments of the present application, by controlling the opening and closing of the third control valve, gas is transported into the liquid material passage of the atomizer to remove the liquid material and residues such as water in the liquid material passage, and it is possible to realize switching between transporting gas into the gas passage.

[0061] In some embodiments, the transfer pump includes a plunger pump and a diaphragm pump, and the diaphragm pump is installed between the first control valve and the plunger pump.

[0062] In the spray drying system according to the embodiments of the present application, due to the relatively high pressure generated by the plunger pump, the liquid material is extracted by the diaphragm pump at a certain pressure in the material supply line and sent into the liquid material passage of the atomizer.

[0063] In some embodiments, a pulsation damper and / or a back pressure valve are further provided in the material supply line. The pulsation damper is installed on the outlet side of the plunger pump, and the back pressure valve is installed on the outlet side of the plunger pump.

[0064] In the spray drying system according to the embodiments of the present application, the outlet pressure of the plunger pump can be adjusted by the back pressure valve to keep the material supply line at a constant pressure. By installing the pulsation damper, not only can the influence of the self-pulse of the flow rate or pressure output from the plunger pump be reduced, but also the impact action of the liquid material flow can be alleviated.

[0065] In some embodiments, an iron removal device and / or a first filter are provided in the material supply line between the plunger pump and the diaphragm pump.

[0066] In the spray drying system according to the embodiments of the present application, thereby, by reducing the impurities in the liquid material, the purity of the liquid material is improved, and the influence of the impurities in the liquid material on the plunger pump is reduced.

[0067] In some embodiments, the ratio of the gas supply amount from the first gas supply line to the atomizer to the material supply amount from the material supply line to the atomizer ranges from 1 to 15.

[0068] In the spray drying system of the embodiments of the present application, it is thereby possible to achieve the purpose of making both the size of the particulate material and the low gas usage compatible.

[0069] In some embodiments, the ratio of the pressure of the first gas supply line to the pressure of the material supply line is 0.6:3.5.

[0070] In the spray drying system of the embodiments of the present application, it thereby achieves the purpose of making both the size of the particulate material and the low gas usage compatible.

[0071] In some embodiments, the spray drying system further includes a drying system, and the drying system includes a blower line, a heater, a first fan, and a second filter. One end of the blower line is connected to the second filter, and the other end communicates with the drying cavity. The first fan and the heater are installed in the blower line.

[0072] In the spray drying system of the embodiments of the present application, after the liquid material is transported into the drying cavity by the atomizer, it is formed into a particulate material by one-step forming in the drying cavity.

[0073] In some embodiments, a third filter is further provided in the blower line, and the third filter is installed on the blowing side of the heater.

[0074] In the spray drying system of the embodiments of the present application, by installing the third filter, impurities in the air in the blower line are filtered, and the influence on the spray drying device caused by the impurities is reduced.

[0075] In some embodiments, the second filter is a low-performance filter or a medium-performance filter, and the third filter is a high-performance filter.

[0076] In the spray drying system according to the embodiment of the present application, air is heated in the heater to filter impurities formed inside the heater, thereby reducing the influence of the impurities on the spray drying device.

[0077] According to a fourth aspect, the embodiment of the present application further provides a control method for a spray drying system. After the spray drying device completes the drying and granulation of the liquid material, the method closes the first control valve and opens the second control valve, so that the transport pump transports water in the water storage device to the liquid material passage of the atomizer via the material supply line, and closes the transport pump after a preset time has elapsed.

[0078] In the control method of the spray drying system according to the embodiment of the present application, since the control method of this spray drying system includes the spray drying device according to the second aspect after the spray drying device completes the drying and granulation of the liquid material, the control method of this spray drying system has the technical effects corresponding to the aforementioned spray drying device, and will not be described further here.

[0079] In some embodiments, after closing the transport pump, it further includes opening a third control valve to allow the gas in the second gas supply line to enter the liquid material passage of the atomizer.

[0080] In the control method of the spray drying system according to the embodiment of the present application, thereby, gas can be transported to the liquid material passage to remove residues such as liquid material and water in the liquid material passage.

[0081] The above description is only an overview of the technical solution of the present application. In order to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other objects, features and advantages of the present application clearer and more understandable, the following will specifically describe the specific embodiments of the present application.

Brief Description of the Drawings

[0082] To more clearly explain the technical solution in the embodiments of this application, the following briefly introduces the drawings that need to be used in the embodiments or exemplary technical descriptions. Obviously, the drawings in the following description are only some embodiments of this application. Based on these drawings, those skilled in the art can obtain other drawings without creative efforts.

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Embodiments for Carrying Out the Invention

[0083] Examples of the present application are described in detail below. Examples of the embodiments are shown in FIGS. 1 to 15. Here, the same or similar reference numerals from beginning to end represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to FIGS. 1 to 15 are exemplary and are used for interpreting the present application and should not be construed as a limitation on the present application.

[0084] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship shown based on the drawings, and is only for the convenience of description and simplification of the description of the present application, and does not indicate or imply that the device or element mentioned must have a specific orientation and be configured and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present application.

[0085] Note that the terms "first" and "second" are only for identification purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features limited by "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, unless otherwise clearly and specifically limited, the meaning of "a plurality of" is two or more.

[0086] In this application, unless otherwise clearly defined or limited, terms such as "attachment", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or an integral one, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or an internal communication between two elements or an interaction relationship between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific situation.

[0087] In the description of this application, it should be noted that the term "and / or" only describes the relevant relationship of the relevant object and represents that three relationships can exist. For example, A and / or B may represent three cases: A alone, the combination of A and B, and B alone.

[0088] Furthermore, it should be noted that in the embodiments of this application, the same reference numerals represent the same components, members, or materials. For the same members or materials in the embodiments of this application, only one of the members or materials in the figure may be used as an example to assign reference numerals. It should be understood that the reference numerals are also applicable to other same members or materials.

[0089] In this application, terms such as "one embodiment", "several embodiments", "example", "specific example", or "several examples", "in one possible design", etc. mean that the specific features, structures, materials, or characteristics described in this embodiment or example are included in at least one embodiment or example of this application. In this specification, the general expressions of the above terms do not necessarily target the same embodiment or example. And the described specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples. It should be noted that when there is no contradiction, those skilled in the art can combine and combine different embodiments or examples and the features of different embodiments or examples described in this specification.

[0090] Granulation is a very important process in the production process of PTC thermosensitive ceramic sheets. The quality of the particle powder material (abbreviated as particle material) directly affects the appearance, mechanical properties and temperature resistance characteristics of the PTC ceramic sheet. Granulation refers to adding a certain amount of binder to the pulverized powder material, uniformly mixing it, and then forming a particulate powder material. Such a powder material has relatively good fluidity and rolling properties, has relatively good strength in the pressing process, and can obtain a sheet that is difficult to delaminate and crack.

[0091] In industrial production, the spray drying method is adopted for granulation. Its basic principle is to spray the powder material with a binder into a granulation tower (also called a drying tower) by a sprayer to atomize it. The drying tower has a drying cavity. The droplets in the drying cavity are dried into particulate powders by the hot air flow in the drying cavity and then discharged from the bottom of the drying cavity.

[0092] The spray drying device in the related technology generally adopts centrifugal atomization drying for granulation, that is, due to the high-speed rotation of the atomization disk, a slurry with a solid content of 5%-50% is rapidly shaken out from the atomization disk to form fine droplets. At this time, the clean air heated by the heater completes heat exchange in the main spray tower to achieve the purpose of drying and granulating the material. The particle size of the particle powder material produced by such a granulation method is mainly affected by the rotation speed of the atomization disk, and the particle size of the particle powder material produced by the above granulation method cannot meet the specification requirements.

[0093] Based on this, an embodiment of the present application provides an atomizer, which installs a liquid material inlet, a liquid material outlet, a gas inlet, a gas outlet, a liquid material passage and a gas passage in the atomizer body, and both the liquid material outlet and the liquid material inlet are communicated with the liquid material passage, both the gas outlet and the gas inlet are communicated with the gas passage, and the gas outlet is installed at the liquid material outlet. Thereby, the liquid material ejected from the liquid material outlet and the gas ejected from the gas outlet are shear-mixed at the liquid material outlet, so that the liquid material is physically broken up by the gas to form fine droplets, and the fine droplets are in the drying cavity. Under the action of the hot air flow, the moisture quickly evaporates and dries, and finally shrinks to form dry spherical particle materials with a relatively small diameter.

[0094] In a spray drying system, the liquid material enters the drying cavity from the liquid material outlet in the liquid material passage of the atomizer to start the spray granulation drying process. The specific process is divided into three stages: atomization of the liquid material, drying and pelletization of the atomized particles, and discharge of the particle powder material. The spray drying device is the core device of the spray drying system.

[0095] The spray drying device includes a drying cavity. The atomizer is installed on the cavity wall of the drying cavity, and the outlet end of the atomizer is located in the drying cavity. The inlet end of the atomizer is connected to the end of the material supply system. The atomizer, also called a spray gun, is an important member that injects the liquid material into the drying cavity at a certain pressure and atomizes and dries it in the drying cavity to form spherical particle materials.

[0096] As shown in FIGS. 1 to 4, FIG. 1 is a schematic structural diagram of a sprayer 10 according to some embodiments of the present application, FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1, FIG. 3 is an enlarged view of the local structure at the liquid material outlet 13 of FIG. 2, and FIG. 4 is a schematic structural diagram of a dispersion member 20 from one perspective according to some embodiments of the present application. The embodiments of the present application provide a sprayer 10, which includes a sprayer body 11. A liquid material inlet 12, a liquid material outlet 13, a gas inlet 14, a gas outlet 15, a liquid material passage 16, and a gas passage 17 are provided in the sprayer body 11. Both the liquid material outlet 13 and the liquid material inlet 12 communicate with the liquid material passage 16, both the gas outlet 15 and the gas inlet 14 communicate with the gas passage 17. The gas outlet 15 is installed at the liquid material outlet 13, and a dispersion member 20 is provided in the liquid material passage 16. The dispersion member 20 is installed at the liquid material outlet 13, and the dispersion member 20 divides the liquid material passage 16 into a plurality of sub-passages communicating with the liquid material outlet 13.

[0097] In the sprayer 10 of the embodiments of the present application, both the liquid material outlet 13 and the liquid material inlet 12 are communicated with the liquid material passage 16, both the gas outlet 15 and the gas inlet 14 are communicated with the gas passage 17, the gas outlet 15 is installed at the liquid material outlet 13, and by installing the dispersion member 20 in the liquid material passage 16, the liquid material passage 16 is dispersed to form a plurality of sub-passages. When the liquid material flows through the liquid material passage 16 and passes through the dispersion member 20 and then flows to the liquid material outlet 13 through the sub-passages, the liquid material is dispersed by the dispersion member 20 in the liquid material passage 16, which increases the turbulence during the flow of the liquid material, and then flows to the liquid material outlet 13. Thereby, the liquid material ejected from the liquid material outlet 13 and the gas ejected from the gas outlet 15 are shear-mixed at the liquid material outlet 13. As a result, the liquid material is physically broken up by the gas to form an atomized fine mist droplet. The fine mist droplet forms a spherical shape under the action of surface tension. Since the mist droplet has a very large surface area, the moisture quickly evaporates and dries under the action of the hot air flow, and finally shrinks to form a dried spherical particle powder material with a relatively small diameter.

[0098] As shown in FIGS. 3 and 4, in some embodiments, a plurality of sub-passages are formed between the outer surface of the dispersion member 20 and the inner wall of the liquid material passage 16.

[0099] With the above arrangement, in this way, when the liquid material flows through the dispersion member 20, some of the liquid material is blocked by the dispersion member 20, and further changes its path to flow from the outer surface of the dispersion member 20 into the liquid material outlet 13 via a plurality of sub-passages. After the liquid material is dispersed by the dispersion member 20 in the liquid material passage 16, it is advantageous to form smaller droplets at the liquid material outlet 13 by being segmented by air at the liquid material outlet 13.

[0100] In addition to forming a plurality of sub-passages between the outer surface of the dispersion member 20 and the inner wall of the liquid material passage 16, by designing the dispersion member 20 in a lattice structure, a plurality of sub-passages may be formed inside the dispersion member 20, or, after forming a plurality of sub-passages between the outer surface of the dispersion member 20 and the inner wall of the liquid material passage 16, the dispersion member 20 may be designed in a lattice structure, whereby a plurality of sub-passages are formed both inside and outside the dispersion member 20, which is more advantageous for the dispersion of the liquid material.

[0101] As shown in FIG. 4, in some embodiments, the dispersion member 20 includes a prismatic segment 21, and sub-passages are respectively formed between each side wall of the prismatic segment 21 and the inner wall of the liquid material passage 16.

[0102] With the above arrangement, in this way, in a cross-section perpendicular to the axial direction of the sprayer body 11, by dividing the liquid material passage 16 into a plurality of sub-passages along the circumferential direction, the turbulence of the liquid material is made more uniform and evenly dispersed by the dispersion member 20, which is advantageous for forming smaller droplets at the liquid material outlet 13.

[0103] For example, the above-mentioned prism segment 21 may be a quadrangular prism, or may be a polygonal prism such as a triangular prism or a pentagonal prism. Of course, the dispersion member 20 may include the prism segment 21, or may be designed as a cylindrical structure. At this time, the inner wall of the liquid material passage 16 may be composed of a plurality of planar side walls, and sub-passages may be formed at the connection points of two adjacent planar side walls and on the outer surface of the dispersion member 20. Here, it is not specifically limited.

[0104] As shown in FIGS. 3 to 5, FIG. 5 is an exploded view of the atomizer 10 in FIG. 1. In some embodiments, the prism segment 21 includes a first prism segment 211 and a second prism segment 212 that are connected. The radius of the circumscribed circle of the cross-section of the first prism segment 211 is larger than the radius of the circumscribed circle of the cross-section of the second prism segment 212, and the first prism segment 211 is located on the side facing the liquid material outlet 13 of the second prism segment 212.

[0105] The above-mentioned cross-section is a cross-section perpendicular to the axial direction of the dispersion member 20.

[0106] The circumscribed circle is as follows. In the above-mentioned cross-section, the contour of the prism segment 21 presents a polygon, and a circle that intersects with all the vertices of the polygon is called the circumscribed circle of the polygon.

[0107] By the above installation, in the cross-section perpendicular to the axial direction of the atomizer body 11, the size of the sub-passage located in the first prism segment 211 is smaller than the size of the sub-passage located in the second prism segment 212. That is, when the liquid material flows from the second prism segment 212 to the first prism segment 211, the space through which the liquid material can pass becomes smaller, so that the flow rate of the liquid material in the liquid material passage 16 changes, the turbulence of the liquid material increases, and the liquid material is ejected from the liquid material outlet 13 at a certain angle, which is advantageous for forming smaller droplets at the liquid material outlet 13.

[0108] As shown in FIGS. 3, 6, and 7, FIG. 6 is an exploded view of the atomizer 10 in FIG. 1, and FIG. 7 is a cross-sectional view of the nozzle member 30 in FIG. 2. In some embodiments, the nozzle member 30 is provided at the liquid material nozzle 13. The nozzle member 30 is located on the side facing the liquid material nozzle 13 of the dispersion member 20, and the periphery of the nozzle member 30 is sealingly connected to the inner wall of the liquid material passage 16. The nozzle member 30 is provided with ejection holes 31, and each ejection hole 31 communicates with each sub-passage.

[0109] By installing the nozzle member 30 on the side facing the liquid material nozzle 13 of the dispersion member 20 and sealingly connecting the periphery of the nozzle member 30 to the inner wall of the liquid material passage 16, the nozzle member 30 and the liquid material passage 16 are firmly connected. Since the nozzle member 30 is provided with ejection holes 31, the liquid material is ejected from the ejection holes 31 at high speed. By improving the speed at which the liquid material is ejected from the liquid material nozzle 13, it is advantageous for forming smaller droplets.

[0110] As shown in FIGS. 3 to 5, in some embodiments, the dispersion member 20 is loosely fitted with the inner wall of the liquid material passage 16. The dispersion member 20 includes a contact post segment 22. The contact post segment 22 is located on the side facing the nozzle member 30 of the prism segment 21. A plurality of communication grooves 23 are provided on the side wall of the contact post segment 22, and each communication groove 23 communicates with the ejection holes 31 and at least one sub-passage. Since the dispersion member 20 is loosely fitted with the inner wall of the liquid material passage 16 and a plurality of communication grooves 23 are provided on the side wall of the contact post segment 22, when the liquid material flows through the dispersion member 20, the turbulence of the liquid material is increased, and the liquid material is cut and dispersed by the communication grooves 23, which is advantageous for forming smaller droplets at the liquid material nozzle 13.

[0111] For example, two communication grooves 23 are provided on the side wall of the contact post segment 22. Of course, the number and size of the communication grooves 23 are determined in combination with factors such as the flow rate of the liquid material and the particle size of the particle material, and are not specifically limited here.

[0112] As shown in FIGS. 4 and 5, in some embodiments, the communication groove 23 is installed obliquely with respect to the axial direction of the abutting post segment 22.

[0113] The communication groove 23 is installed obliquely with respect to the axial direction of the abutting post segment 22. In this way, by changing the flow direction of the liquid material in the liquid material passage 16, a rotating vortex is formed at the communication location between the communication groove 23 and the liquid material passage 16, which is further advantageous for the liquid material to be cut and dispersed.

[0114] As shown in FIG. 3, in some embodiments, the ejection hole 31 includes a tapered hole segment 311 and a columnar hole segment 312. The columnar hole segment 312 is connected to the small end 3111 of the tapered hole segment 311. The large end 3112 of the tapered hole segment 311 allows the abutting post segment 22 to be inserted. One end of the communication groove 23 penetrates the end facing the ejection port member 30 of the abutting post segment 22 and communicates with the tapered hole segment 311.

[0115] The small end 3111 of the tapered hole segment 311 refers to the end where the aperture of the tapered hole is relatively small, and the large end 3112 of the tapered hole segment 311 refers to the end where the aperture of the tapered hole is relatively large.

[0116] One end of the communication groove 23 penetrates the end facing the ejection port member 30 of the abutting post segment 22 and communicates with the tapered hole segment 311, so that the liquid material is ejected from the ejection hole 31 at a high speed in a spiral shape through the ejection hole 31, and the liquid material is cut and dispersed by the air.

[0117] As shown in FIGS. 3 and 7, in some embodiments, the ejection port member 30 is press-fitted with the liquid material passage 16.

[0118] The above-mentioned interference fit is a fitting with an interference allowance (including the case where the minimum interference allowance is equal to zero). That is, in a cross-section perpendicular to the axial direction of the atomizer body 11, when the algebraic difference obtained by subtracting the sizes in each direction of the fitting liquid material passage 16 from the sizes in each direction of the nozzle member 30 is negative, it is an interference fit.

[0119] By the interference fit between the nozzle member 30 and the liquid material passage 16, the nozzle member 30 and the liquid material passage 16 are firmly connected. In this way, when the liquid material flows at high speed to the liquid material nozzle 13, by reducing the probability that the nozzle member 30 is ejected from the liquid material nozzle 13 together with the liquid material, the reliability of the atomizer 10 is improved, and further the service life of the atomizer 10 is extended.

[0120] As shown in FIG. 3, in some embodiments, a position limiting portion 32 is provided on the side of the nozzle member 30 away from the dispersion member 20, and the position limiting portion 32 is used to prevent the nozzle member 30 from exiting from the liquid material nozzle 13.

[0121] By installing the position limiting portion 32, the nozzle member 30 is restricted within the liquid material nozzle 13 of the atomizer 10, and by reducing the probability that the nozzle member 30 is ejected from the liquid material nozzle 13, the probability that the nozzle member 30 is ejected from the liquid material nozzle 13 and the device malfunctions is reduced.

[0122] As shown in FIG. 3, in some embodiments, the position limiting portion 32 may be an annular flange installed at one end of the liquid material passage 16. The diameter of the central hole of the annular flange is smaller than the maximum diameter of the nozzle member 30, and the central hole of the annular flange is the liquid material nozzle 13.

[0123] The annular flange installed at one end of the liquid material passage 16 is used as the position limiting portion 32. In this way, by reducing the probability that the position limiting portion 32 prevents the nozzle member 30 from exiting the liquid material nozzle 13, the risk of equipment failure is reduced. In addition, the diameter of the central hole of the annular flange is smaller than the maximum diameter of the nozzle member 30, and by reducing the diameter of the liquid material nozzle 13, it is advantageous to obtain particle materials with smaller particle sizes.

[0124] Of course, the position limiting portion 32 may be an annular flange installed at one end of the liquid material passage 16. In addition, a single annular member may be installed at the liquid material nozzle 13 of the liquid material passage 16. This annular member may be connected to the end face close to the liquid material nozzle 13 of the liquid material passage 16 by means such as locking or adhesion. It is used to prevent the nozzle member 30 from exiting the liquid material nozzle 13, and it is not specifically limited here.

[0125] As shown in FIG. 3, in some embodiments, the sprayer body 11 includes an outer tube 111 and an inner tube 112 bored inside the outer tube 111. The tube cavity of the inner tube 112 is the liquid material passage 16, the space between the inner tube 112 and the outer tube 111 is the gas passage 17, the liquid material nozzle 13 is the nozzle opening at one end of the inner tube 112, and the liquid material nozzle 13 is located at the nozzle opening at one end of the outer tube 111. The gas nozzle 15 is installed surrounding the liquid material nozzle 13.

[0126] By fitting the outer tube 111 over the inner tube 112, the liquid material passage 16, the gas passage 17, the liquid material nozzle 13, and the gas nozzle 15 are formed, which is easy to assemble. By installing the gas nozzle 15 surrounding the liquid material nozzle 13, the liquid material ejected from the liquid material nozzle 13 is sufficiently segmented in all directions by the gas ejected from the gas nozzle 15, which is advantageous for forming smaller droplets.

[0127] For example, the space between the end of the outer tube 111 near the liquid material inlet 12 and the inner tube 112 is hermetically connected, and one opening is provided in the tube wall of the outer tube 111. In this way, the liquid material inlet 12 and the gas inlet 14 are separated, facilitating the attachment and connection of the material supply line 210 and the gas supply line, transporting the liquid material and air to the atomizer 10 respectively, and reducing the probability of mutual influence in the process of liquid material transportation and air transportation.

[0128] As shown in FIGS. 3, 8 and 9, FIG. 8 is a schematic structural diagram of the atomizer 10 in one perspective in FIG. 1, and FIG. 9 is a cross-sectional view taken along line B-B of FIG. 8. In some embodiments, a sleeve 113 is externally fitted outside the inner tube 112. The sleeve 113 is located at the end where the liquid material outlet 13 of the inner tube 112 is installed. The first end 1131 of the sleeve 113 is hermetically connected to the outer tube 111. The second end 1132 of the sleeve 113 is inserted into the outer tube 111 and hermetically connected to the inner tube 112. 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 provided along the circumferential direction on the peripheral wall of the sleeve 113, and all the plurality of gas holes 1130 communicate with both the liquid material passage 16 and the gas passage 17.

[0129] A plurality of gas holes 1130 are provided along the circumferential direction on the peripheral wall of the sleeve 113, and all the plurality of gas holes 1130 communicate with both the liquid material passage 16 and the gas passage 17. In this way, a part of the air in the gas passage 17 passes through the gas holes 1130 and enters the liquid material passage 16, increasing the turbulence during the flow of the liquid material in the liquid material passage 16. Another part of the air passes through the gas passage 17 and is ejected from the gas outlet 15 to divide the liquid material, which is advantageous for the liquid material to be sufficiently cut.

[0130] As shown in FIG. 9, in some embodiments, each gas hole 1130 is an inclined hole. The hole axis of the gas hole 1130 and the central axis of the sleeve 113 are straight lines in different planes from each other. The plurality of gas holes 1130 are arranged at intervals along the circumferential direction of the sleeve 113, and the inclination direction of each gas hole 1130 is the same.

[0131] The straight lines on the different surfaces mentioned above are two straight lines that are not in the same plane. Two straight lines that are on different surfaces from each other neither intersect nor are parallel. The fact that the hole axis of the gas hole 1130 and the central axis of the sleeve 113 are straight lines on different surfaces from each other means that the hole axis of each gas hole 1130 (the dotted line M in the plane shown in Fig. 9) does not intersect and is not parallel to the central axis of the sleeve 113 (which is perpendicular to the plane shown in Fig. 9 and is the center point of the sleeve 113 in Fig. 9).

[0132] Taking the gas hole 1130 corresponding to the central axis indicated by the dotted line M in the plane shown in Fig. 9 as an example, the end of the central axis of this gas hole 1130 close to the central axis of the sleeve 113 is offset to one side with respect to the end away from the central axis of the sleeve 113 (the center point of the sleeve 113 in Fig. 9), and the fact that the above-mentioned inclination directions are the same means that the central axes of each of the plurality of gas holes 1130 are all offset to the same side.

[0133] Each gas hole 1130 is designed as an inclined hole. In this way, by changing the direction of the gas, a part of the air enters the liquid material passage 16 through the gas hole 1130, and by forming a swirling flow at the communication point between the gas passage 17 and the liquid material passage 16, the turbulence of the liquid material in the liquid material passage 16 is increased. Another part divides the liquid material through the gas passage 17. The plurality of gas holes 1130 are arranged at intervals along the circumferential direction of the sleeve 113, which is further advantageous for more uniformly dispersing the liquid material and obtaining a more uniform particle material.

[0134] As shown in FIG. 9, in some embodiments, the range of the inclination angle α of the axis of the gas hole 1130 with respect to the central axis of the sleeve 113 is 15 degrees (°) to 60 degrees (°). Here, the inclination angle of the gas hole 1130 refers to the inclination angle of the axis of the gas hole 1130 with respect to the central axis of the sleeve 113, that is, the inclination angle is an acute angle sandwiched between the axis of the gas hole 1130 (the dotted line M in the plane shown in FIG. 9) and the first normal line (the dotted line N in the plane shown in FIG. 9), and the first normal line is the normal line at the intersection of the cylindrical surface where the outer peripheral surface of the sleeve 113 is located and the axis of the gas hole 1130.

[0135] The above inclination angle is an important parameter in the design process of the atomizer 10. When the inclination angle is less than 15° or greater than 60°, the amount of gas that enters the liquid material passage 16 from the air in the gas passage 17 is relatively small, and a swirling flow cannot be formed. At the same time, the amount of gas ejected from the gas ejection port 15 also decreases, so that the liquid material is not sufficiently divided and the particle size does not reach the requirement. By increasing the gas amount, when a swirling flow is formed in the liquid material passage 16, the liquid material is sufficiently divided, the amount of gas ejected from the gas ejection port 15 also increases, the obtained particle size is relatively small, and it causes waste of air.

[0136] The inclination angle of the gas hole 1130 is designed within the above range. In this way, the air in the gas passage 17 can form a rotating vortex at the connection between the gas hole 1130 and the liquid material passage 16, which can not only increase the turbulence of the liquid material, but also the gas amount at the gas ejection port 15 can sufficiently divide the liquid material at the liquid material ejection port 13 to form a particle size that meets the requirements, thereby achieving the purpose of making both the particle size and the air usage amount small.

[0137] As shown in FIG. 9, in some embodiments, the pitch between two adjacent gas holes 1130 is equal.

[0138] With the above arrangement, air enters the liquid material passage 16 uniformly through a plurality of gas holes 1130, and the liquid material is uniformly divided by the gas, which is beneficial to the uniformity of the particle material.

[0139] The pitch between two adjacent gas holes 1130 being equal includes that the angle formed by the axes of two adjacent gas holes 1130 is exactly equal, and can also include that the angle formed by the axes of two adjacent gas holes 1130 is approximately equal within a certain range. Here, it is not specifically limited.

[0140] As shown in FIG. 3, in some embodiments, the sleeve 113 has a tapered tube cavity 114, and the gas outlet 15 is located at the small end of the tube cavity 114.

[0141] The above-mentioned tapered shape means that the cavity wall 51 of the tube cavity 114 is installed obliquely along the axial direction of the sleeve 113, so that the sleeve 113 presents a substantially funnel shape.

[0142] By installing the gas outlet 15 at the small end of the tapered tube cavity 114, air gathers at the gas outlet 15 along the cavity wall 51 of the tube cavity 114, improving the air ejection speed. In this way, the air ejected from the gas outlet 15 is ejected obliquely from all around to the center of the liquid material outlet 13, which is beneficial for better dividing the liquid material to make the particle material more uniform, and thereby obtaining a relatively small particle size.

[0143] As shown in FIG. 3, in some embodiments, the outer tube 111 includes an outer tube body 1111 and a receiving tube 1112. One end of the receiving tube 1112 is detachably connected to the outer tube body 1111, a mounting hole 1110 is provided at the other end of the receiving tube 1112, the first end 1131 of the sleeve 113 is inserted into the mounting hole 1110 in a fitting manner, and the second end 1132 of the sleeve 113 is inserted into the receiving tube 1112.

[0144] The above arrangement is advantageous for improving the reliability of the connection between the outer tube 111 and the sleeve 113. Further, the receiving tube 1112 is removably connected to the outer tube body 1111. In this way, it is easy to check the attachment and detachment of the outer tube 111 and the sleeve 113 and to replace the sleeve 113.

[0145] As shown in FIG. 3, in some embodiments, the inner tube 112 includes an inner tube body 1121 and an ejection header tube 1122 that is removably connected to the inner tube body 1121. The ejection header tube 1122 is installed within the receiving tube 1112. The tube opening of the ejection header tube 1122 that is away from the inner tube body 1121 is the liquid material ejection port 13. The sleeve 113 is externally fitted onto the ejection header tube 1122.

[0146] The inner tube body 1121 and the ejection header tube 1122 are connected in a removable manner. In this way, it is easy to check the attachment and detachment and replacement of the inner tube 112 and the sleeve 113. And the sleeve 113 is externally fitted onto the ejection header tube 1122. By improving the strength of the connection between the sleeve 113 and the ejection header tube 1122, the reliability of the atomizer 10 is improved.

[0147] The above removable connection includes locking, screwing, etc., and is not specifically limited here.

[0148] As shown in FIG. 3, in some embodiments, a connection flange 115 having an annular shape is provided on the peripheral wall of the inner tube 112. The connection flange 115 includes a fitting portion 1151 and a stopper portion 1152 that are arranged along the axial direction of the inner tube 112. The diameter of the stopper portion 1152 is larger than the diameter of the fitting portion 1151. The fitting portion 1151 is fitted and inserted into the tube opening of the second end 1132 of the sleeve 113, and the stopper portion 1152 is stoppered against the tube opening edge of the second end 1132 of the sleeve 113.

[0149] With the above arrangement, the connection flange 115 presents a stepped shape, the fitting portion 1151 is fitted and inserted into the pipe opening at the second end 1132 of the sleeve 113, improving the connection strength between the inner pipe 112 and the sleeve 113. By installing the stopper portion 1152, it reduces the movement of the sleeve 113 along the axial direction of the outer pipe 111 relative to the inner pipe 112, and the inner pipe 112 and the sleeve 113 are firmly connected.

[0150] As shown in FIG. 3, in some embodiments, a sealing material 60 is installed at the connection location along the axial direction of the inner pipe 112 between the inner pipe body 1121 and the ejection header pipe 1122. The sealing material 60 has a through hole 61 for the liquid material passage 16 to pass through.

[0151] The installation of the sealing material 60 not only improves the sealing performance at the connection location along the axial direction of the inner pipe 112 between the inner pipe body 1121 and the ejection header pipe 1122, but also can play a certain buffering role in certain cases.

[0152] The above sealing material 60 may be made of an elastic material, such as an elastic sealing ring. In this way, the sealing material 60 can play a certain buffering role and can fill the gap formed by the attachment between the ejection header pipe 1122 and the inner pipe body 1121, thereby improving the connection reliability between the ejection header pipe 1122 and the inner pipe body 1121.

[0153] As shown in FIGS. 3, 8 and 10, FIG. 10 is a cross-sectional view taken along the line C-C of FIG. 8. In some embodiments, a support member 40 is provided inside the outer pipe body 1111. The support member 40 is installed at the end of the outer pipe body 1111 and supports between the outer pipe body 1111 and the inner pipe 112.

[0154] The outer pipe body 1111 generally presents an elongated shape. By installing the support member 40 at the end of the outer pipe body 1111, the support member 40 provides a radial support force to the outer pipe 111, reducing the deformation of the outer pipe 111, making the connection location between the outer pipe 111 and the inner pipe 112 stronger, and further being advantageous for improving the reliability of the atomizer 10.

[0155] The above-mentioned long shape means that the size along the axial direction of the outer tube body 1111 is larger than the size along the radial direction thereof.

[0156] As shown in FIG. 3, in some embodiments, the outer tube body 1111 and the support member 40 may be of an integral structure, thereby reducing the number of members of the atomizer 10 and improving the strength of the outer tube 111.

[0157] The above-mentioned integral structure includes an integrally formed structure, a welded structure, or an adhered structure. When both the outer tube body 1111 and the support member 40 are made of a metal material, both may be integrally formed by casting or formed into an integral structure by welding. Here, when one is made of a non-metal material, it may be integrally formed by injection or formed into an integral structure by adhesion or the like, and it is not specifically limited herein.

[0158] As shown in FIG. 10, in some embodiments, the support member 40 includes a plurality of support arms 41 arranged along the circumferential direction of the inner tube 112, and a space through which air can pass is formed between two adjacent support arms 41.

[0159] By the above arrangement, when the inner tube 112 or the outer tube 111 is deformed, the support arm 41 can contact the outer tube 111 and the inner tube 112 along the radial direction, thereby providing a radial support force to the outer tube 111 and the inner tube 112, further reducing the deformation of the outer tube 111 and the inner tube 112, improving the reliability of the atomizer 10, and the formed space allows air to pass through, thereby achieving the purpose of combining the function of connecting the inner tube 112 and the outer tube 111 and air transportation.

[0160] For example, the support member 40 includes three support arms 41 arranged along the circumferential direction of the inner tube 112, and a space through which air can pass is formed between two adjacent support arms 41, so that three spaces through which air can pass are formed along the circumferential direction of the inner tube 112.

[0161] As shown in FIGS. 11 and 12, FIG. 11 is a schematic structural diagram of a spray drying system according to some embodiments of the present application, and FIG. 12 is a schematic diagram of the connection locations between the spray drying device 100, the material supply system 200, the gas supply system 300, and the drying system 400 in FIG. 11. Embodiments of the present application further provide a spray drying device 100, which includes a drying cavity 50 and the atomizer 10 of the above embodiments, and the atomizer 10 is attached to the cavity wall 51 of the drying cavity 50.

[0162] In the spray drying device 100 of the embodiments of the present application, since the spray drying device 100 includes the atomizer 10 according to the above embodiments, the spray drying device 100 also has the technical effects corresponding to the above-mentioned atomizer 10, and will not be described further here.

[0163] The fact that the atomizer 10 is attached to the cavity wall 51 of the drying cavity 50 means that the atomizer 10 is attached to the cavity wall 51 of the drying cavity 50 by a screwing or clip connection method, so that the liquid material outlet 13 and the gas outlet 15 of the atomizer 10 are located inside the drying cavity 50. In this way, after the liquid material is ejected from the liquid material outlet 13, it is formed in one step by atomization and drying in the drying cavity 50, greatly improving the spray granulation efficiency and facilitating the inspection of the installation of the atomizer 10.

[0164] The liquid material enters the drying cavity 50 from the liquid material outlet 13 of the atomizer 10 and starts the spray granulation drying process. The specific process is divided into three stages: atomization of the liquid material, drying and pelletization of the atomized particles, and discharge of the particle powder material. The above one-step forming means that the above three stages are all operated alone in the drying cavity 50 and completed by one device, which is highly efficient and energy-saving.

[0165] As shown in FIG. 12, in some embodiments, the cavity wall 51 of the drying cavity 50 includes a top wall and a side wall, and the atomizer 10 is installed on the top wall of the drying cavity 50.

[0166] By installing the atomizer 10 on the top wall of the drying cavity 50, the droplets ejected from the liquid material ejection port 13 of the atomizer 10 descend in the drying cavity 50 by the spiral hot air, and the utilization rate of the drying space inside the drying cavity 50 is relatively high.

[0167] The atomizer 10 may be installed on the top wall of the drying cavity 50, or may be installed on the side wall of the drying cavity 50, and it is not specifically limited here.

[0168] As shown in FIG. 12, in some embodiments, the number of atomizers 10 is plural. For example, three atomizers 10 are installed on the cavity wall 51 of the drying cavity 50.

[0169] By installing a plurality of atomizers 10 on the cavity wall 51 of the drying cavity 50, the spray granulation efficiency is improved.

[0170] Of course, the number of atomizers 10 may be three, or may be other numbers such as two, four, five, etc. The atomizers 10 may be evenly distributed on the top wall of the drying cavity 50, may be evenly distributed on the side wall of the drying cavity 50, or may be randomly distributed on the top wall or the side wall, and it is not specifically limited here.

[0171] As shown in FIGS. 11 to 15, FIG. 13 is a schematic structural diagram of the material supply system 200 in FIG. 11, FIG. 14 is a schematic structural diagram of the drying system 400 in FIG. 11, and FIG. 15 is a schematic structural diagram of the dust removal system 500 in FIG. 11. The embodiments of the present application further provide a spray drying system, which includes a material supply system 200, a gas supply system 300, and the spray drying device 100 in the above embodiments. The material supply system 200 communicates with the liquid material inlet 12 of the atomizer 10, and the gas supply system 300 communicates with the gas inlet 14 of the atomizer 10.

[0172] In the spray drying system according to the embodiment of the present application, since this spray drying system includes the spray drying device 100 according to the above embodiment, this spray drying system also has the technical effects corresponding to the aforementioned spray drying device 100, and will not be described further here.

[0173] As shown in FIGS. 11 and 13, in some embodiments, the material supply system 200 includes a material supply line 210, a material storage device 220, and a water storage device 230. One end of the material supply line 210 communicates with the material storage device 220, and the other end communicates with the liquid material inlet 12 of the atomizer 10. A transport pump and a first control valve 1 are provided in the material supply line 210. The first control valve 1 is installed between the transport pump and the material storage device 220. The water storage device 230 is connected to the material supply line 210 via a water supply line 250, and the water supply line 250 is connected between the transport pump and the first control valve 1. A second control valve 2 is provided in the water supply line.

[0174] Here, the material storage device 220 is mainly a device for storing liquid materials, and may be a stirring tank.

[0175] Here, the water storage device 230 is mainly a device for storing water, and may be a water storage tank.

[0176] By installing the water storage device 230 within the material supply system 200, liquid material transportation and water transportation share the material supply line 210. When the spray drying device 100 is not in the granulation operation, the water supply line 250 is communicated with the material supply line 210 of the existing material supply system 200. The transport pump transports the water in the water storage device 230 to the liquid material passage 16 of the atomizer 10. As the water flows through the liquid material passage 16, residues such as the liquid material in the liquid material passage 16 can be washed away, thereby ensuring that the liquid material passage 16 is clean. One material supply line 210 can realize supplying materials to the atomizer 10 and cleaning the atomizer 10. In this way, only the water storage device 230 and the second control valve 2 for controlling the line switching need to be added to the existing material supply system 200. The renovation cost of the material supply system 200 is relatively small, which is beneficial for popularization in the market. At the same time, by omitting the process of removing and cleaning the atomizer 10, the labor cost can be reduced.

[0177] As shown in FIGS. 11 and 12, 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 communicates with the gas inlet 14, and the second gas supply line 320 communicates with the liquid material inlet 12. A third control valve 3 is provided in the second gas supply line 320.

[0178] By installing two gas supply lines and controlling the opening and closing of the third control valve 3, it is possible to switch between transporting gas into the liquid material passage 16 of the atomizer 10 to remove residues such as the liquid material and water in the liquid material passage 16 and transporting gas into the gas passage 17. In this way, the process of removing and cleaning the atomizer 10 is omitted, and a significant amount of labor cost is saved.

[0179] It should be noted that the first gas supply line 310 and the second gas supply line 320 may adopt the same gas source to supply air, or may adopt different gas sources to supply air. Generally, a fourth control valve 9 is installed in the first gas supply line 310, and by controlling the third control valve 3 and the fourth control valve 9, the switching between the first gas supply line 310 and the second gas supply line 320 is realized. The fourth control valve 9 adjusts the pressure range in the first gas supply line 310 to 0.4 megapascals (Mpa) to 1.2 megapascals (Mpa), and the third control valve 3 may adjust the pressure range in the second gas supply line 320 to 0.3 Mpa to 0.6 Mpa. Generally, in order to save gas usage, the pressure in the second gas supply line 320 is made lower than the pressure in the first gas supply line 310.

[0180] As shown in FIG. 13, in some embodiments, the transport pump includes a plunger pump 4 and a diaphragm pump 5, and the diaphragm pump 5 is installed between the first control valve 1 and the plunger pump 4.

[0181] Here, the plunger pump 4 is an important device in the hydraulic system. It realizes oil absorption and oil pressure by changing the volume of the seal operating chamber as the plunger reciprocates in the cylinder. The plunger pump 4 has advantages such as a high rated pressure, a compact structure, high efficiency, and easy flow regulation.

[0182] Here, the diaphragm pump 5 protects the plunger and the pump cylinder by separating the liquid to be transported from the plunger and the pump cylinder by means of a diaphragm. The diaphragm pump 5 is a special form of a positive displacement pump. It sucks in and discharges liquid by changing the volume of the working chamber by the reciprocating movement of the diaphragm sheet. Here, the positive displacement pump is a pump that transports liquid using the volume change in the pump cylinder.

[0183] The plunger pump 4 generates a relatively high pressure and is used in cooperation with the diaphragm pump 5. In this way, the liquid material is extracted by the diaphragm pump 5 at a constant pressure in the material supply line 210 and sent to the liquid material passage 16 of the atomizer 10.

[0184] As shown in FIG. 13, in some embodiments, the material supply line 210 is further provided with a pulsation damper 6 and / or a back pressure valve 7. The pulsation damper 6 is installed on the outlet side of the plunger pump 4, and the back pressure valve 7 is installed on the outlet side of the plunger pump 4. For example, the material supply line 210 is further provided with a pulsation damper 6 and a back pressure valve 7. The pulsation damper 6 is installed on the outlet side of the plunger pump 4, and the back pressure valve 7 is installed on the outlet side of the plunger pump 4.

[0185] Here, the back pressure valve 7 is generally installed in the outlet pipe. For example, it is installed at the connection point between the material supply line 210 and the atomizer 10 and is used to maintain a constant pressure at the pump outlet. Since the phenomenon of self-flow or siphon often occurs due to gravity or other actions at the outlet of the plunger pump 4, installing the back pressure valve 7 on the outlet side of the plunger pump 4 can reduce the fluctuations in flow rate and pressure caused by siphon, which is beneficial to stabilizing the pressure of the material supply line 210.

[0186] Here, the pulsation damper 6 is a pressure vessel for eliminating the liquid pressure pulsation or flow rate pulsation in the pipe. It can stabilize the pressure and flow rate of the fluid, eliminate the vibration of the pipe, protect the downstream instruments and equipment, and improve the pump volumetric efficiency.

[0187] The back pressure valve 7 can adjust the outlet pressure of the plunger pump 4 to keep the material supply line 210 at a constant pressure. By installing the pulsation damper 6 and using the back pressure valve 7 and the pulsation damper 6 in combination, not only can the influence of the self-pulse of the flow rate or pressure output from the plunger pump 4 be reduced, but also the impact action of the liquid material flow can be mitigated.

[0188] Regardless, only the pulsation damper 6 or the back pressure valve 7 may be installed in the material supply line 210, and it is not specifically limited here.

[0189] As shown in FIG. 12, in some embodiments, a manual valve 260, a pressure regulating valve 270, and a check valve 280 are further provided in the material supply line 210.

[0190] Here, the manual valve 260 is used to manually control the opening and closing of the material supply line 210 and is mainly used for inspection.

[0191] Here, the pressure regulating valve 270 drives the valve by receiving a signal from an industrial automation control system, changes the cross-sectional area between the valve core and the valve seat, controls process parameters such as the flow rate, temperature, and pressure of the pipe medium, and mainly functions to automatically adjust the pressure in the material supply line 210.

[0192] The check valve 280 allows the fluid (such as liquid materials and water) to flow only in one direction from the inlet to the outlet and cannot flow backward, mainly serving to prevent the backflow of the fluid in the material supply line 210.

[0193] As shown in FIG. 13, in some embodiments, an iron removal device 8 and / or a first filter 240 are provided in the material supply line 210 between the plunger pump 4 and the diaphragm pump 5. For example, an iron removal device 8 and a first filter 240 are provided in the material supply line 210 between the plunger pump 4 and the diaphragm pump 5.

[0194] Here, the iron removal device 8 is a device that can generate a strong magnetic field attraction force. It can remove ferromagnetic impurities mixed in the material, ensure the safe and normal operation of mechanical equipment such as crushers and grinders in the transportation system, effectively reduce the probability of accidents caused by impurities, and improve the quality and purity of liquid materials.

[0195] Here, the first filter 240 is an essential device in the medium transport pipe (here, the material supply line 210 of the material supply system 200), and is generally installed at the inlet end device of a pressure reducing valve, a pressure relief valve, a constant water level valve, and other equipment, mainly for the purpose of filtering particle impurities in water or liquid materials.

[0196] An iron removal device 8 and a first filter 240 are provided in the material supply line 210 between the plunger pump 4 and the diaphragm pump 5. In this way, impurities in the liquid material, especially metal impurities, can be filtered, thereby improving the purity of the liquid material and reducing the probability of accidents occurring in equipment such as the plunger pump 4 or the atomizer 10 due to impurities, especially metal impurities, in the liquid material.

[0197] Of course, only the iron removal device 8 or the first filter 240 may be installed in the material supply line 210 between the plunger pump 4 and the diaphragm pump 5, and it is not specifically limited here.

[0198] As shown in FIG. 12, in some embodiments, the range of the ratio of the gas supply amount from the first gas supply line 310 to the atomizer 10 to the material supply amount from the material supply line 210 to the atomizer 10 is 1 to 15.

[0199] The ratio of the gas supply amount from the first gas supply line 310 to the atomizer 10 to the material supply amount from the material supply line 210 to the atomizer 10 means that 1 liter of liquid material consumes 1 to 15 cubic meters of air.

[0200] The ratio of the gas supply rate to the material supply rate is a main parameter for spray granulation of the sprayer 10. When this ratio is too small, that is, when the gas supply rate of the air consumed by the liquid material per liter is less than 1 cubic meter, the liquid material is not sufficiently cut, and the particle size does not meet the requirements. When this ratio value is too large, that is, when the gas supply rate of the air consumed by the liquid material per liter is greater than 15 cubic meters, the particle size can meet the requirements, but it causes waste of air. Design the ratio of the gas supply rate to the material supply rate within the above range. In this way, by sufficiently dividing the liquid material, the particle size meets the requirements and no waste of air is caused, thereby achieving the purpose of making both the size of the particle material and the low gas consumption compatible.

[0201] In some embodiments, the ratio of the pressure of the first gas supply line 310 to the pressure of the material supply line 210 is 0.6:3.5.

[0202] The pressure range of the first gas supply line 310 is 0.1 Mpa to 1.5 Mpa, and the pressure range of the material supply line 210 is 0.1 Mpa to 5.0 Mpa. The ratio of the pressure of the first gas supply line 310 to the pressure of the material supply line 210 being 0.6:3.5 means the ratio of the pressure of the first gas supply line 310 to the pressure of the material supply line 210 when the pressure of the first gas supply line 310 is 0.6 Mpa and the pressure of the material supply line 210 is 3.5 Mpa. The pressure of the first gas supply line 310 and the pressure of the material supply line 210 are main parameters for spray granulation of the sprayer 10. How to reasonably set the pressure value of the first gas supply line 310 and the pressure value of the material supply line 210 and find the balance point of the ratio of the pressure of the first gas supply line 310 to the pressure of the material supply line 210 is a difficulty in spray granulation.

[0203] By designing the ratio of the pressure of the first gas supply line 310 to the pressure of the material supply line 210 to be 0.6:3.5, the particle size obtained after passing through the atomizer 10 of the spray drying device 100 reaches the technical target of D50 = 3 microns (um) - 10 microns (um) and the comprehensive index of D50 ≤ 8 um and D90 ≤ 25 um, meeting the requirements and being relatively uniform, with less gas consumption, thereby achieving the purpose of achieving both the particle material size and less gas consumption.

[0204] As shown in FIGS. 11 and 13, in some embodiments, the spray drying system further includes a drying system 400, and the drying system 400 includes a blower line 410, a heater 420, a first fan 430, and a second filter 440. One end of the blower line 410 is connected to the second filter 440, and the other end communicates with the drying cavity 50. The first fan 430 and the heater 420 are installed on the blower line 410.

[0205] Here, the heater 420 mainly functions to heat the air.

[0206] Here, the second filter 440 mainly serves to filter impurities in the air.

[0207] Here, the first fan 430 is a blower fan that transports air into the drying cavity 50 via the blower line 410.

[0208] The drying cavity 50 is communicated with the drying system 400. In this way, after the liquid material is transported into the drying cavity 50 via the atomizer 10, the drying system 400 transports hot air into the drying cavity 50 to dry the droplets, thereby forming the liquid material into a particle material in one step in the drying cavity 50.

[0209] As shown in FIGS. 11 and 13, in some embodiments, a third filter 450 is further provided on the blower line 410, and the third filter 450 is installed on the blowing side of the heater 420.

[0210] Since air is heated inside the heater 420 and it is easy to form metal oxides on the inner wall of the heater 420, by installing a third filter 450 on the blowing side of the heater 420, impurities in the hot air, especially metal oxide impurities formed inside the heater 420, can be filtered before the hot air enters the atomizer 10. Thereby, the risk of short - circuiting of the atomizer 10 caused by the entry of metal oxide impurities into the atomizer 10 is reduced, and the reliability of the spray drying apparatus 100 is further improved.

[0211] As shown in FIGS. 11 and 13, in some embodiments, the second filter 440 is a low - performance filter or a medium - performance filter, and the third filter 450 is a high - performance filter.

[0212] Here, the low - performance filter is mainly used to filter dust particles of 5um or more. The low - performance filter has three styles: plate type, folded type, and bag type. The outer frame materials include paper frame, aluminum frame, and galvanized iron frame. The filtering materials include non - woven fabric, nylon mesh, activated carbon filter material, metal pore mesh, etc. The protective nets include double - sided injection - molded iron wire mesh and double - sided galvanized iron wire mesh.

[0213] Here, the medium - performance filter is mainly used to collect dust particles of 1um - 5um and various floating substances, and the filtration efficiency is 60% - 95%. Furthermore, it can also be used as the front - end filtration of high - performance filtration, reducing the load of high - performance filtration and extending its service life.

[0214] Here, the high - performance filter is mainly used as the terminal filtration of various filtration systems to collect dust particles of 0.5um or more and various floating substances. The high - performance filter uses ultra - fine glass fiber paper as the filter material, is folded with partition plates using materials such as veneer paper and aluminum foil board, sealed with a new type of polyurethane sealant, and manufactured with a galvanized plate, stainless steel plate, or aluminum alloy profile as the outer frame.

[0215] In the spray drying system of the embodiment of the present application, air is pre-filtered before entering the heater 420 to remove impurities in the air, and is secondarily filtered after passing through the heater 420. Since metal oxides are likely to form on the inner wall of the heater 420 after the air is heated in the heater 420, by using a high-performance filter as the third filter 450, the hot air can be comprehensively filtered before entering the atomizer 10 to filter out impurities in the hot air, especially metal oxide impurities formed inside the heater 420. Thereby, the risk of short-circuiting of the atomizer 10 caused by the entry of metal oxide impurities into the atomizer 10 is reduced, and the reliability of the spray drying apparatus 100 is further improved.

[0216] As shown in FIGS. 11 and 15, in some embodiments, the material supply system 200 further includes a dust removal system 500 connected to the spray drying apparatus 100, and the dust removal system 500 includes a cyclone separator 510, a bag filter 520, and a second fan 530.

[0217] Here, the cyclone separator 510 is a device for separating gas-solid or liquid-solid systems. The operating principle is to separate solid particles or droplets having a relatively large inertial centrifugal force by shaking them against the outer wall surface by introducing an airflow in the tangential direction to cause a rotational motion.

[0218] Here, the bag filter 520, also called a bag type dust collector, is a dry dust collection device. It is suitable for collecting fine, dry and non-fibrous dust. The filter bag of the bag filter 520 is made of a woven filter cloth or a non-woven felt, and uses the filtering action of the fiber fabric to filter the dust-containing gas. After the dust-containing gas enters the bag type dust collector, dust with large particles and large specific gravity settles by the action of gravity and falls into the ash hopper. When the gas containing fine dust passes through the filtering material, the dust is blocked and stays, and the gas is purified.

[0219] Here, the second fan 530 is a suction fan, which mainly sucks the fine particle material in the drying cavity 50 together with the dry air into the equipment outside the drying cavity 50, and the second fan 530 may be a centrifugal fan.

[0220] The fine particle material in the drying cavity 50 is transported together with the drying air to the inside of the cyclone separator 510. After being effectively separated by the cyclone separator 510, the fine particle material enters the collection cylinder at the bottom of the separator and is recovered. The remaining exhaust gas containing a very small amount of the fine particle material is sucked into the dust collector by the second fan 530, dust-removed and collected again. The exhaust gas that has achieved harmless treatment of the exhaust gas is discharged from the chimney, thereby reducing environmental pollution.

[0221] The embodiment of the present application further provides a control method for a spray drying system. After the spray drying device 100 completes the drying and granulation of the liquid material, by closing the first control valve 1 and opening the second control valve 2, the transport pump transports the water in the water storage device 230 to the liquid material passage 16 of the atomizer 10 via the material supply line 210, and after a preset time has elapsed, closes the transport pump.

[0222] After the spray drying device 100 completes the drying and granulation of the liquid material, the above steps are adopted. When the spray drying device 100 is not in the granulation operation, by means of the material supply line 210 of the existing material supply system 200, the transport pump transports the water in the water storage device 230 to the liquid material passage 16 of the atomizer 10. The water can flow through the liquid material passage 16 and wash away residues such as the liquid material in the liquid material passage 16, thereby ensuring that the liquid material passage 16 is clean. In this way, only the second control valve 2 for controlling the switching of the water storage device 230 and the material supply line 210 needs to be added to the existing material supply system 200. The transformation cost of the material supply system 200 is relatively small, and by omitting the process of removing and cleaning the atomizer 10, labor costs are reduced.

[0223] In some embodiments, after closing the transport pump, it further includes opening the third control valve 3 to allow the gas in the second gas supply line 320 to enter the liquid material passage 16 of the atomizer 10.

[0224] After closing the transfer pump, the above steps are added. When the spray drying device 100 is not in the granulation operation, the gas can be transported to the liquid material passage 16 by the sprayer 10. The gas can remove residues such as the liquid material and water in the liquid material passage 16, thereby keeping the liquid material passage 16 of the sprayer 10 clean and dry. In this way, by keeping the liquid material passage 16 clean and dry without removing and cleaning the sprayer 10, it is beneficial to extend the service life of the sprayer 10.

[0225] As shown in FIGS. 1 to 5, in one embodiment, the sprayer 10 includes a sprayer body 11. A liquid material inlet 12, a liquid material outlet 13, a gas inlet 14, a gas outlet 15, a liquid material passage 16, and a gas passage 17 are provided in the sprayer body 11. Both the liquid material outlet 13 and the liquid material inlet 12 communicate with the liquid material passage 16. Both the gas outlet 15 and the gas inlet 14 communicate with the gas passage 17. The gas outlet 15 is installed at the liquid material outlet 13. A dispersion member 20 is provided in the liquid material passage 16. The dispersion member 20 is loosely fitted with the inner wall of the liquid material passage 16. The dispersion member 20 is installed at the liquid material outlet 13. The dispersion member 20 divides the liquid material passage 16 into a plurality of sub-passages communicating with the liquid material outlet 13.

[0226] In the sprayer 10 of the embodiment of the present application, both the liquid material outlet 13 and the liquid material inlet 12 are communicated with the liquid material passage 16, both the gas outlet 15 and the gas inlet 14 are communicated with the gas passage 17, the gas outlet 15 is installed at the liquid material outlet 13, and the dispersion member 20 is installed in the liquid material passage 16. In this way, the liquid material is dispersed by the dispersion member 20 in the liquid material passage 16, and the liquid material ejected from the liquid material outlet 13 and the gas ejected from the gas outlet 15 shear and mix the liquid material at the liquid material outlet 13. As a result, the liquid material is physically crushed by the gas to form fine droplets. The fine droplets form spheres under the action of surface tension. Since the droplets have a very large surface area, the moisture quickly evaporates and dries under the action of the hot air flow, and finally shrinks to form a dried spherical particle powder material with a relatively small diameter.

[0227] As shown in FIGS. 3 to 5, the dispersion member 20 includes a prism segment 21 and a contact column segment 22. The contact column segment 22 is located on the side facing the nozzle member 30 of the prism segment 21. Two communication grooves 23 are provided on the side wall of the contact column segment 22 and are installed obliquely with respect to the axial direction of the contact column segment 22. Each communication groove 23 communicates with the ejection hole 31 and at least one sub-passage. The prism segment 21 includes a first prism segment 211 and a second prism segment 212 that are connected. The radius of the circumscribed circle of the cross-section of the first prism segment 211 is larger than the radius of the circumscribed circle of the cross-section of the second prism segment 212. The first prism segment 211 is located on the side facing the liquid material ejection port 13 of the second prism segment 212.

[0228] As shown in FIG. 3, the ejection hole 31 includes a tapered hole segment 311 and a columnar hole segment 312. The columnar hole segment 312 is connected to the small end 3111 of the tapered hole segment 311. The large end 3112 of the tapered hole segment 311 is insertable with the contact column segment 22. One end of the communication groove 23 penetrates the end facing the nozzle member 30 of the contact column segment 22 and communicates with the tapered hole segment 311.

[0229] As shown in FIGS. 3, 6, and 7, a nozzle member 30 is provided at the liquid material ejection port 13. The nozzle member 30 is in interference fit with the liquid material passage 16. The nozzle member 30 is located on the side facing the liquid material ejection port 13 of the dispersion member 20. The periphery of the nozzle member 30 is hermetically connected to the inner wall of the liquid material passage 16. The ejection hole 31 is provided in the nozzle member 30, and the ejection hole 31 communicates with each sub-passage.

[0230] As shown in FIG. 3, the annular flange installed at one end of the liquid material passage 16 forms a position limiting portion 32. The position limiting portion 32 is used to prevent the nozzle member 30 from coming out of the liquid material ejection port 13. The diameter of the central hole of the annular flange is smaller than the maximum diameter of the nozzle member 30. The central hole of the annular flange is the liquid material ejection port 13.

[0231] As shown in FIG. 3, the atomizer body 11 includes an outer tube 111 and an inner tube 112 formed in the outer tube 111. The outer tube 111 includes an outer tube body 1111 and a receiving tube 1112. One end of the receiving tube 1112 is removably connected to the outer tube body 1111, and a mounting hole 1110 is provided at the other end of the receiving tube 1112. The first end 1131 of the sleeve 113 is inserted to fit the mounting hole 1110, and the second end 1132 of the sleeve 113 is inserted into the receiving tube 1112. The inner tube 112 includes an inner tube body 1121 and a jet header tube 1122 removably connected to the inner tube body 1121. The jet header tube 1122 is installed in the receiving tube 1112. The tube orifice away from the inner tube body 1121 of the jet header tube 1122 is the liquid material jet outlet 13. The sleeve 113 is externally fitted to the jet header tube 1122, so that the gas jet outlet 15 is installed surrounding the liquid material jet outlet 13. The sleeve 113 is located at the end where the liquid material jet outlet 13 of the inner tube 112 is installed. The first end 1131 of the sleeve 113 is sealingly connected to the outer tube 111, and the second end 1132 of the sleeve 113 is inserted into the outer tube 111 and sealingly connected to the inner tube 112. The sleeve 113 has a tapered tube cavity 114. The gas jet outlet 15 is located at the small end of the tube cavity 114, so that the gas jet outlet 15 is located at the first end 1131 of the sleeve 113 and formed between the sleeve 113 and the inner tube 112. A plurality of gas holes 1130 are provided along the circumferential direction on the peripheral wall of the sleeve 113. All the plurality of gas holes 1130 communicate with the liquid material passage 16 and the gas passage 17.

[0232] As shown in FIG. 3, a connection flange 115 presenting an annular shape is provided on the peripheral wall of the inner tube 112. The connection flange 115 includes a fitting portion 1151 and a stopper portion 1152 arranged along the axial direction of the inner tube 112. The diameter of the stopper portion 1152 is larger than that of the fitting portion 1151. The fitting portion 1151 is fitted and inserted into the pipe orifice of the second end 1132 of the sleeve 113, and the stopper portion 1152 is stoppered against the pipe orifice edge of the second end 1132 of the sleeve 113. A sealing material 60 is installed at the connection location along the axial direction of the inner tube 112 between the inner tube main body 1121 and the ejection header pipe 1122. The sealing material 60 has a through hole 61 through which the liquid material passage 16 passes.

[0233] As shown in FIG. 9, the pitch between two adjacent gas holes 1130 is equal. Each gas hole 1130 is an inclined hole. The hole axis of the gas hole 1130 and the central axis of the sleeve 113 are straight lines in different planes. The inclination direction of each gas hole 1130 is the same along the circumferential direction of the sleeve 113, and the range of the inclination angle of the hole axis of the gas hole 1130 with respect to the central axis of the sleeve 113 is 15° to 60°. Taking the gas hole 1130 corresponding to the central axis indicated by the dotted line M in the plane shown in FIG. 9 as an example, the end of the hole axis of this gas hole 1130 closer to the central axis of the sleeve 113 is offset to one side with respect to the end farther from the central axis of the sleeve 113 (the center point of the sleeve 113 in FIG. 9). The fact that the above inclination directions are the same means that the hole axes of each of the plurality of gas holes 1130 are all offset to the same side. The above inclination angle of the gas hole 1130 is the inclination angle of the hole axis of the gas hole 1130 with respect to the central axis of the sleeve 113, that is, the inclination angle is an acute angle sandwiched between the hole axis of the gas hole 1130 (the dotted line M in the plane shown in FIG. 9) and the first normal line (the dotted line N in the plane shown in FIG. 9). The first normal line is the normal line at the location where the outer peripheral surface of the sleeve 113 intersects the hole axis of the gas hole 1130 on the cylindrical surface where the outer peripheral surface of the sleeve 113 is located.

[0234] As shown in FIGS. 3, 8 and 10, a support member 40 is integrally connected to the outer tube body 1111. The support member 40 is installed at the end of the outer tube body 1111 and supports between the outer tube body 1111 and the inner tube 112. The support member 40 includes three support arms 41 arranged along the circumferential direction of the inner tube 112, and a space through which air can pass is formed between two adjacent support arms 41.

[0235] Finally, it should be noted that the above embodiments are only for explaining the technical solutions of this application and do not limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that it is still possible to modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of their technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of each embodiment of this application, and they should be included within the scope of the claims and the specification of this application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment may be combined in any way. This application is not limited to the specific embodiments disclosed in the specification, but includes all technical solutions within the scope of the claims.

Claims

1. A sprayer (10) comprising a sprayer body (11), wherein the sprayer body (11) is provided with a liquid material inlet (12), a liquid material outlet (13), a gas inlet (14), a gas outlet (15), a liquid material passage (16) and a gas passage (17). The liquid material outlet (13) and the liquid material inlet (12) are both in communication with the liquid material passage (16). The gas outlet (15) and the gas inlet (14) are both in communication with the gas passage (17). The gas outlet (15) is installed at the liquid material outlet (13). A dispersion member (20) is provided in the liquid material passage (16). The dispersion member (20) is installed at the liquid material outlet (13). The dispersion member (20) divides the liquid material passage (16) into a plurality of sub-passages (160) communicating with the liquid material outlet (13). Sprayer (10).

2. The sprayer (10) according to claim 1, wherein a plurality of the sub-passages (160) are formed between the outer surface of the dispersion member (20) and the inner wall of the liquid material passage (16).

3. The sprayer (10) according to claim 2, wherein the dispersion member (20) includes a prismatic segment (21), and the sub-passages (160) are respectively formed between each side wall of the prismatic segment (21) and the inner wall of the liquid material passage (16).

4. The sprayer (10) according to claim 3, wherein the prismatic segment (21) includes a first prismatic segment (211) and a second prismatic segment (212) connected thereto. The radius of the circumscribed circle of the cross-section of the first prismatic segment (211) is larger than the radius of the circumscribed circle of the cross-section of the second prismatic segment (212). The first prismatic segment (211) is located on the side facing the liquid material outlet (13) of the second prismatic segment (212).

5. A spray outlet member (30) is provided at the liquid material outlet (13). The spray outlet member (30) is located on the side facing the liquid material outlet (13) of the dispersion member (20), and the periphery of the spray outlet member (30) is sealingly connected to the inner wall of the liquid material passage (16). The spray outlet member (30) is provided with spray holes (31), and the spray holes (31) are all in communication with each of the sub-passages (160). The sprayer (10) according to claim 4.

6. The dispersion member (20) is loosely fitted with the inner wall of the liquid material passage (16). The dispersion member (20) includes a contact column segment (22). The contact column segment (22) is located on the side facing the ejection port member (30) of the prism segment (21). A plurality of communication grooves (23) are provided on the side wall of the contact column segment (22). Each of the communication grooves (23) communicates with the ejection hole (31) and at least one of the sub-passages (160). The atomizer (10) according to claim 5.

7. The communication groove (23) is installed obliquely with respect to the axial direction of the contact column segment (22). The atomizer (10) according to claim 6.

8. The ejection hole (31) includes a tapered hole segment (311) and a columnar hole segment (312). The columnar hole segment (312) is connected to the small end (3111) of the tapered hole segment (311). The large end (3112) of the tapered hole segment (311) allows the contact column segment (22) to be inserted. One end of the communication groove (23) penetrates the end of the contact column segment (22) facing the ejection port member (30) and communicates with the tapered hole segment (311). The atomizer (10) according to claim 7.

9. The ejection port member (30) is press-fitted with the liquid material passage (16). The atomizer (10) according to claim 8.

10. A position limiting portion (32) is provided on the side of the ejection port member (30) away from the dispersion member (20). The position limiting portion (32) is used to prevent the ejection port member (30) from exiting from the liquid material ejection port (13). The atomizer (10) according to claim 9.

11. The position limiting portion (32) is an annular flange installed at one end of the liquid material passage (16). The diameter of the central hole of the annular flange is smaller than the maximum diameter of the ejection port member (30). The central hole of the annular flange is the liquid material ejection port (13). The atomizer (10) according to claim 10.

12. The sprayer body (11) includes an outer tube (111) and an inner tube (112) formed in the outer tube (111). The tube cavity (114) of the inner tube (112) is the liquid material passage (16). The space between the inner tube (112) and the outer tube (111) is the gas passage (17). The liquid material outlet (13) is the nozzle at one end of the inner tube (112), and the liquid material outlet (13) is located at the nozzle at one end of the outer tube (111). The gas outlet (15) is installed surrounding the liquid material outlet (13). The sprayer (10) according to any one of claims 1 to 11.

13. A sleeve (113) is externally fitted on the outer side of the inner tube (112). The sleeve (113) is located at the end of the inner tube (112) where the liquid material outlet (13) is installed. The first end (1131) of the sleeve (113) is hermetically connected to the outer tube (111). The second end (1132) of the sleeve (113) is inserted into the outer tube (111) and hermetically connected to the inner tube (112). 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 provided along the circumferential direction on the circumferential wall of the sleeve (113). All of the plurality of gas holes (1130) communicate with the gas outlet (15) and the gas passage (17). The sprayer (10) according to claim 12.

14. Each of the gas holes (1130) is an inclined hole. The hole axis of the gas hole (1130) and the central axis of the sleeve (113) are straight lines in different planes. The plurality of gas holes (1130) are arranged at intervals along the circumferential direction of the sleeve (113). The sprayer (10) according to claim 13.

15. The range of the inclination angle of the hole axis of the gas hole (1130) with respect to the central axis of the sleeve (113) is 15° to 60°. The sprayer (10) according to claim 14.

16. The pitch between two adjacent gas holes (1130) is equal. The sprayer (10) according to claim 15.

17. The sleeve (113) has a tapered tube cavity (114), and the gas ejection port (15) is located at the small end (3111) of the tube cavity (114). The atomizer (10) according to claim 16.

18. The outer tube (111) includes an outer tube (111) body and a receiving tube (1112). One end of the receiving tube (1112) is removably connected to the outer tube (111) body. An attachment hole (1110) is provided at the other end of the receiving tube (1112). The first end (1131) of the sleeve (113) is inserted to fit into the attachment hole (1110), and the second end (1132) of the sleeve (113) is inserted into the receiving tube (1112). The atomizer (10) according to claim 17.

19. The inner tube (112) includes an inner tube (112) body and an ejection header tube (1122) removably connected to the inner tube (112) body. The ejection header tube (1122) is installed in the receiving tube (1112). The nozzle of the ejection header tube (1122) away from the inner tube (112) body is the liquid material ejection port (13). The sleeve (113) is externally fitted to the ejection header tube (1122). The atomizer (10) according to claim 18.

20. An annular connection flange (115) is provided on the peripheral wall of the inner tube (112). The connection flange (115) includes a fitting portion (1151) and a stopper portion (1152) arranged along the axial direction of the inner tube (112). The diameter of the stopper portion (1152) is larger than the diameter of the fitting portion (1151). The fitting portion (1151) is inserted to fit into the nozzle of the second end (1132) of the sleeve (113), and the stopper portion (1152) is stoppered against the nozzle edge of the second end (1132) of the sleeve (113). The atomizer (10) according to claim 19.

21. A support member (40) is provided in the outer tube (111) body. The support member (40) is installed at the end of the outer tube (111) body and supports between the outer tube (111) body and the inner tube (112). The atomizer (10) according to claim 20.

22. The support member (40) includes a plurality of support arms (41) arranged along the circumferential direction of the inner tube (112), and a space through which air can pass is formed between two adjacent support arms (41). The atomizer (10) according to claim 21.

23. An atomizing drying apparatus (100) comprising a drying cavity (50) and an atomizer (10) according to any one of claims 1 to 22, wherein the atomizer (10) is attached to a cavity wall (51) of the drying cavity (50). Atomizing drying apparatus (100).

24. An atomizing drying system (400) comprising a material supply system (200), a gas supply system (300), and an atomizing drying apparatus (100) according to claim 23, wherein the material supply system (200) is in communication with a liquid material inlet (12) of the atomizer (10), and the gas supply system (300) is in communication with a gas inlet (14) of the atomizer (10). Atomizing drying system (400).

25. The material supply system (200) includes a material supply line (210), a material storage device (220), and a water storage device (230). One end of the material supply line (210) communicates with the material storage device (220), the other end communicates with the liquid material inlet (12) of the atomizer (10), and a transport pump and a first control valve (1) are provided in the material supply line (210). The first control valve (1) is installed between the transport pump and the material storage device (220). The water storage device (230) is connected to the material supply line (210) via a water supply line (250), and the water supply line (250) is connected between the transport pump and the first control valve (1). A second control valve (2) is provided in the water supply line (250). The atomizing drying system (400) according to claim 24.

26. 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) communicates with the gas inlet (14), and the second gas supply line (320) communicates with the liquid material inlet (12). A third control valve (3) is provided in the second gas supply line (320). The atomizing drying system (400) according to claim 25.

27. The transfer pump includes a plunger pump (4) and a diaphragm pump (5), and the diaphragm pump (5) is installed between the first control valve (1) and the plunger pump (4). The spray drying system (400) according to claim 26.

28. A pulsation damper (6) and / or a back pressure valve (7) are further provided in the material supply line (210). The pulsation damper (6) is installed on the outlet side of the plunger pump (4), and the back pressure valve (7) is installed on the outlet side of the plunger pump (4). The spray drying system (400) according to claim 27.

29. An iron removal device (8) and / or a first filter (240) are provided in the material supply line (210) between the plunger pump (4) and the diaphragm pump (5). The spray drying system (400) according to claim 28.

30. The range of the ratio between the gas supply amount from the first gas supply line (310) to the atomizer (10) and the material supply amount from the material supply line (210) to the atomizer (10) is 1 to 15. The spray drying system (400) according to claim 29.

31. The ratio between the pressure of the first gas supply line (310) and the pressure of the material supply line (210) is 0.6:3.

5. The spray drying system (400) according to claim 30.

32. The spray drying system (400) further includes a drying system (400). The drying system (400) includes a blower line (410), a heater (420), a first fan (430), and a second filter (440). One end of the blower line (410) is connected to the second filter (440), and the other end communicates with the drying cavity (50). The first fan (430) and the heater (420) are installed in the blower line (410). The spray drying system (400) according to claim 31.

33. A third filter (450) is further provided in the blower line (410). The third filter (450) is installed on the blowing side of the heater (420). The spray drying system (400) according to claim 32.

34. The second filter (440) is a low-performance filter or a medium-performance filter, and the third filter (450) is a high-performance filter. The spray drying system (400) according to claim 33.

35. A control method used for the spray drying system (400) according to any one of claims 26 to 32, wherein after the spray drying device (100) completes the drying and granulation of the liquid material, the first control valve (1) is closed and the second control valve (2) is opened, so that the transport pump transports the water in the water storage device (230) to the liquid material passage (16) of the atomizer (10) via the material supply line (210), and after a preset time has elapsed, the transport pump is closed.

36. The control method of the spray drying system (400) according to claim 35, further comprising opening a third control valve (3) after closing the transport pump, so that the gas in the second gas supply line (320) enters the liquid material passage (16) of the atomizer (10).

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