Sprayer, spray drying apparatus, 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, specifically to sprayers, 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 "Sprayer, Spray Drying Device, Spray Drying System and Its Control Method", 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 under the action of hot spray air, the powder slurry or solution is dried and agglomerated to obtain spherical agglomerates. This method is widely used in the production of catalysts or other particles with various particle size requirements. In the production process of spray granulation drying, the finally produced particle sizes are different.

[0004] In related technologies, spray drying devices generally adopt centrifugal atomization drying for granulation, that is, due to the high-speed rotation of an 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 small particle size particle powder materials cannot be produced.

Summary of the Invention

[0005] The purpose of the embodiments of this application is to provide a sprayer, a spray drying device, a spray drying system and their control methods, including but not limited to solving the problem that small particle size particle powder materials cannot be produced.

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

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

[0008] In the invention of this application, both the liquid material nozzle and the liquid material inlet are connected to the liquid material passage, and both the gas nozzle and the gas inlet are connected to the gas passage. The gas nozzle is installed at the liquid material nozzle. As a result, the liquid material ejected from the liquid material nozzle and the gas ejected from the gas nozzle are shear-mixed at the liquid material nozzle. The liquid material is physically crushed and atomized by the gas to form fine droplets. These fine droplets form a spherical shape due to surface tension, and because the droplets have a very large surface area, the moisture evaporates rapidly due to the action of the hot airflow, causing them to shrink and eventually form a dried, relatively small-diameter spherical particle powder material.

[0009] In some embodiments, a dispersion member is provided within 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, the liquid material is divided by the dispersion member as it flows through the member, which is advantageous in forming smaller droplets at the liquid material nozzle.

[0011] In some embodiments, multiple 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 this application, as the liquid material flows through the dispersion member, it flows into the liquid material nozzle via multiple sub-passages, and the liquid material is dispersed within the liquid material passages, which is advantageous in forming smaller droplets at the liquid material nozzle.

[0013] In some embodiments, the dispersion member includes prismatic segments, with sub-passages 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 this application, the liquid material is thus divided by the side ridges between two adjacent side walls of the dispersion member as it flows through the dispersion member, which is advantageous in forming smaller droplets at the liquid material nozzle.

[0015] In some embodiments, the prism segment includes a first prism segment and a second prism segment that are connected, wherein the circumradius of the cross-section of the first prism segment is greater than the circumradius of the cross-section of the second prism segment, and the first prism segment is located on the side of the second prism segment toward the liquid material nozzle.

[0016] In the atomizer of the embodiment of this application, this is advantageous in that it changes the flow velocity of the liquid material in the liquid material passage and ejects the liquid material from the liquid material outlet at a constant angle, thereby forming smaller droplets at the liquid material outlet.

[0017] In some embodiments, a nozzle member is provided at the liquid material nozzle, the nozzle member is located on the side of the dispersion member facing the liquid material nozzle, and the periphery of the nozzle member is sealed to the inner wall of the liquid material passage, and the nozzle member is provided with ejection holes, which communicate with each of the sub-passages.

[0018] The atomizer of the embodiment of this application is advantageous in forming smaller droplets by rapidly ejecting the liquid material from the ejection port and improving the speed at which the liquid material is ejected from the liquid material ejection port.

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

[0020] In the sprayer of the embodiment of this application, the liquid material is divided and dispersed by the connecting grooves as it flows through the dispersion member, which is advantageous in forming smaller droplets at the liquid material outlet.

[0021] In some embodiments, the connecting groove is installed at an inclination with respect to the axial direction of the abutting column segment.

[0022] In the atomizer of the embodiment of this application, changing the flow direction of the liquid material in the liquid material passage is advantageous in forming a rotational vortex, and further in dividing and dispersing the liquid material.

[0023] In some embodiments, the ejection port includes a tapered hole segment and a columnar hole segment, the columnar hole segment being connected to the smaller end of the tapered hole segment, the larger end of the tapered hole segment being into which a contact column segment can be inserted, and one end of a communication groove passing through the end of the contact column segment toward the ejection member and communicating with the tapered hole segment.

[0024] In the atomizer of the embodiment of this application, the flow direction of the liquid material is changed by ejecting the gas from the nozzle at high speed in a spiral pattern, which is advantageous for the liquid material to be divided and dispersed by the air.

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

[0026] In the sprayer of the embodiment of this application, this reduces the probability that the nozzle member will be ejected from the liquid material nozzle.

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

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

[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 ejection port member, and the central hole of the annular flange is the liquid material ejection port.

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

[0031] In some embodiments, the atomizer body includes an outer tube and an inner tube bored 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 ejection port is the nozzle at one end of the inner tube, and the liquid material ejection port is located at the nozzle at one end of the outer tube. The gas ejection port is installed surrounding the liquid material ejection port.

[0032] In the atomizer of the embodiment of the present application, by installing the gas ejection port surrounding the liquid material ejection port, the liquid material ejected from the liquid material ejection port is sufficiently segmented in each direction by the gas ejected from the gas ejection port, which is advantageous for forming smaller droplets.

[0033] In some embodiments, a sleeve is fitted over the outside of an inner tube, the sleeve is located at the end of the inner tube where a liquid material nozzle is installed, the first end of the sleeve is sealed to the outer tube, the second end of the sleeve is inserted into the outer tube and sealed to the inner tube, the gas nozzle is located at the first end of the sleeve and formed between the sleeve and the inner tube, a plurality of gas holes are provided along the circumferential direction on the peripheral wall of the sleeve, and each of the gas holes communicates with a liquid material passage and a gas passage.

[0034] In the sprayer of the embodiment of this application, a plurality of gas holes are provided along the circumferential direction on the peripheral wall of the sleeve, and each of the plurality of gas holes communicates with the liquid material passage and the gas passage. In this way, the turbulence in the flow of the liquid material in the liquid material passage is increased, which is advantageous in that the liquid material is sufficiently divided.

[0035] In some embodiments, each gas hole is an inclined hole, the hole axis of the inclined hole and the central axis of the sleeve are straight lines on opposite planes, the multiple gas holes are spaced apart along the circumferential direction of the sleeve, and the inclination direction of each gas hole is the same.

[0036] In the atomizer of the embodiment of this application, the direction of the gas is changed, thereby forming a swirling flow, which is advantageous for breaking up the liquid material.

[0037] In some embodiments, the inclination angle of the hole axis of the gas hole with respect to the central axis of the sleeve is in the range of 15° to 60°, where the inclination angle is an acute angle between the hole axis of the gas hole and a first normal, and the first normal is the normal to the cylindrical surface on which the outer surface of the sleeve is located at the point where it intersects with the hole axis of the gas hole.

[0038] The sprayer of the embodiment of this application thereby achieves the objective of achieving both size and uniformity of the particle material.

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

[0040] In the sprayer of the embodiment of this application, the liquid material is uniformly cut by the gas, which is advantageous for the uniformity of the particulate material.

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

[0042] In the sprayer of the embodiment of this application, the liquid material is cut more effectively by changing the direction of gas ejection.

[0043] In some embodiments, the outer tube includes an outer tube body and a housing tube, one end of which is detachably connected to the outer tube body, and the other end of which is provided with a mounting hole, the first end of which is fitted into the mounting hole and inserted, and the second end of which is inserted into the housing tube.

[0044] In the sprayer of the embodiment of this application, this is advantageous in improving 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 a discharge header pipe removably connected to the inner tube body, the discharge header pipe being installed within the housing tube, the outlet of the discharge header pipe away from the inner tube body being a liquid material discharge outlet, and a sleeve being fitted over the discharge header pipe.

[0046] In the sprayer of the embodiment of this application, this facilitates the attachment and detachment of the sprayer for inspection, and improves the strength of the connection between the sleeve and the discharge header pipe.

[0047] In some embodiments, an annular connecting flange is provided on the circumferential wall of the inner tube, and the connecting flange includes a fitting portion and a stopper portion arranged along the axial direction of the inner tube, the diameter of which the stopper portion is larger than the diameter of the fitting portion, the fitting portion is inserted to fit into the tube opening at the second end of the sleeve, and the stopper portion is stopped at the tube opening edge at the second end of the sleeve.

[0048] In the sprayer of the embodiment of this application, the inner pipe and the sleeve are securely connected in this manner.

[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 provides support between the outer tube body and the inner tube.

[0050] In the sprayer embodiment of this application, the installation of a support member improves the strength of the connection point between the outer tube and the inner tube, thereby reducing deformation of the outer tube and thus improving the reliability of the sprayer.

[0051] In some embodiments, the support member includes a plurality of support arms arranged along the circumferential direction of the inner tube, with an air-passable space formed between two adjacent support arms.

[0052] In the sprayer of the embodiment of this application, the support member can achieve the objective of simultaneously connecting the inner and outer pipes and conveying air.

[0053] According to a second aspect, an embodiment of the present application further provides a spray drying apparatus comprising a drying cavity and a sprayer of the embodiment of the first aspect, wherein the sprayer is mounted on the cavity wall of the drying cavity.

[0054] In the spray drying apparatus of the embodiment of this application, since the spray drying apparatus includes a sprayer according to the first embodiment described above, this spray drying apparatus has the same technical effects as the aforementioned sprayer, and will not be described further here.

[0055] According to a third aspect, embodiments of the present application further provide a spray drying system comprising a material supply system, a gas supply system, and the spray drying apparatus of the second embodiment described above, wherein the material supply system communicates with a liquid material inlet of a sprayer, and the gas supply system communicates with a gas inlet of a sprayer.

[0056] In the spray drying system of the embodiment of this application, since this spray drying system includes a spray drying apparatus according to the second embodiment described above, this spray drying system has the same technical effects as the aforementioned spray drying apparatus and will not be described further here.

[0057] In some embodiments, the material supply system includes a material supply line, a material storage device, and a water storage device, wherein one end of the material supply line communicates with the material storage device and the other end communicates with the liquid material inlet of a sprayer, the material supply line is provided with a transport pump and a first control valve, 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, the water supply line is connected between the transport pump and the first control valve, and a second control valve is provided in the water supply line.

[0058] In the spray drying system of the embodiment of this application, liquid material transport and water transport share a single material supply line, thereby enabling the supply and cessation of liquid material by controlling the first control valve, and enabling the transport of water into the liquid material passage of the sprayer by controlling the switching between the first and second control valves, thereby cleaning the liquid material passage, or enabling spray granulation by transporting liquid material into the liquid material passage of the sprayer. Material supply and cleaning are achieved with a single material supply line, saving modification costs, making it advantageous for market dissemination, and saving labor costs by eliminating the process of removing and cleaning the sprayer.

[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 communicating with a gas inlet, the second gas supply line communicating with a liquid material inlet, and a third control valve provided in the second gas supply line.

[0060] In the spray drying system of the embodiment of this application, by controlling the opening and closing of a third control valve, it is possible to switch between transporting gas into the liquid material passage of the sprayer to remove the liquid material and residues such as water from the liquid material passage, and transporting gas into the gas passage.

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

[0062] In the spray drying system of the embodiment of this application, the plunger pump generates a relatively high pressure, which causes the liquid material to be extracted at a constant pressure by the diaphragm pump within the material supply line and sent into the liquid material passage of the sprayer.

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

[0064] In the spray drying system of the embodiment of this application, the outlet pressure of the plunger pump can be adjusted by a back pressure valve to maintain a constant pressure in the material supply line, and by installing a pulsation damper, not only is the effect of the pulse itself on the flow rate or pressure output from the plunger pump reduced, but the shock effect on the liquid material flow can also be mitigated.

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

[0066] In the spray drying system of the embodiment of this application, the purity of the liquid material is improved by reducing impurities in the liquid material, and the influence of impurities in the liquid material on the plunger pump is reduced.

[0067] In some embodiments, the ratio of the amount of gas supplied from the first gas supply line to the sprayer to the amount of material supplied from the material supply line to the sprayer is in the range of 1 to 15.

[0068] The spray drying system of the embodiment of this application thereby achieves the objective of balancing the size of the particle material with low gas consumption.

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

[0070] The spray drying system of the embodiment of this application thereby achieves the objective of balancing the size of the particle material with low gas consumption.

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

[0072] In the spray drying system of the embodiment of this application, the liquid material is transported by a sprayer into the drying cavity, and then formed in one step within the drying cavity to form particulate material.

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

[0074] In the spray drying system of the embodiment of this application, the installation of a third filter filters out impurities in the air in the air supply line, thereby reducing the impact of impurities on the spray drying device.

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

[0076] In the spray drying system of the embodiment of this application, air is heated inside the heater, and impurities formed inside the heater are filtered out, thereby reducing the impact of impurities on the spray drying device.

[0077] According to a fourth aspect, an embodiment of the present application further provides a method for controlling a spray drying system, the method comprising closing a first control valve and opening a second control valve after the spray drying apparatus has completed drying and granulation of a liquid material, thereby causing a transport pump to transport water from a water reservoir through a material supply line to the liquid material passage of a sprayer, and closing the transport pump after a predetermined time has elapsed.

[0078] In the control method for a spray drying system of the embodiment of this application, since the control method for the spray drying system includes a spray drying apparatus according to the second embodiment described above after the spray drying apparatus has completed drying and granulation of the liquid material, this control method for the spray drying system has the same technical effects as the aforementioned spray drying apparatus and will not be described further here.

[0079] In some embodiments, after closing the transport pump, the gas in the second gas supply line is further opened to allow the gas to enter the liquid material passage of the atomizer.

[0080] In the control method for the spray drying system of the embodiment of this application, 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 merely an outline of the proposed technology of this application. To better understand the technical means of this application, it can be implemented according to the specifications. Furthermore, to make the above and other objectives, features, and advantages of this application clearer and easier to understand, the following will describe specific embodiments of this application. [Brief explanation of the drawing]

[0082] To more clearly illustrate the technical concepts in the embodiments of this application, the following is a brief introduction to the drawings that may be used in the embodiments or illustrative technical descriptions. It is obvious that the drawings in the following description represent only a few embodiments of this application, and those skilled in the art can obtain other drawings based on these without expending any creative effort. [Figure 1] This is a schematic diagram of the structure of a sprayer according to several embodiments of this application. [Figure 2] This is a cross-sectional view AA in Figure 1. [Figure 3] Figure 2 is a magnified view of the local structure at the liquid material nozzle. [Figure 4] This is a schematic diagram of the structure of a dispersed member from one perspective, according to several embodiments of this application. [Figure 5] This is a schematic diagram of the structure of a dispersed member from a different perspective, according to some embodiments of this application. [Figure 6] Figure 1 is an exploded view of the sprayer. [Figure 7] This is a cross-sectional view of the nozzle member in Figure 2. [Figure 8] Figure 1 is a schematic diagram of the sprayer's structure from one viewpoint. [Figure 9] Figure 8 is a cross-sectional view of BB. [Figure 10] Figure 8 is a cross-sectional view of CC. [Figure 11] This is a schematic diagram of the structure of a spray drying system according to several embodiments of this application. [Figure 12] Figure 11 is a schematic diagram showing the connections between the spray drying apparatus, material supply system, gas supply system, and drying system. [Figure 13] Figure 11 is a schematic diagram of the material supply system structure. [Figure 14] Figure 11 is a schematic diagram of the drying system structure. [Figure 15] Figure 11 is a schematic diagram of the dust removal system structure. [Modes for carrying out the invention]

[0083] The embodiments of this application are described in detail below, and examples of these embodiments are shown in Figures 1 to 15, where 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 Figures 1 to 15 are illustrative and are used to interpret this application and should not be understood as limitations thereto.

[0084] In the description of this application, it should be understood that the directions or positional relationships indicated by terms such as "length," "width," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" are directions or positional relationships shown based on the drawings, and are merely for the convenience and simplification of the description in this application. They do not indicate or imply that the mentioned devices or elements have a specific direction or must be configured and operated in a specific direction, and therefore should not be understood as limitations on this application.

[0085] Furthermore, the terms "first" and "second" are merely for identification purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features being referred to. Thus, features designated as "first" or "second" may explicitly or implicitly include one or more of these features. In the description of this application, unless otherwise clearly and specifically defined, "multiple" means two or more.

[0086] In this application, unless otherwise explicitly defined or limited, terms such as “attachment,” “connection,” “bonding,” and “fixing” should be understood in a broad sense, and may include, for example, a fixed connection, a removable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, or an internal communication or interaction relationship between two elements. A person skilled in the art will be able to understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0087] In the description of this application, it should be explained that the term "and / or" merely describes the relationship between related objects, indicating that three relationships may exist. For example, A and / or B may represent three cases: A alone, a combination of A and B, and B alone.

[0088] Furthermore, it should be explained that in the embodiments of this application, the same reference numerals represent the same component or the same member or material. In the embodiments of this application, it is possible that only one of the same member or material is given a reference numeral in the figures, and it should be understood that the same reference numerals apply to other identical members or materials.

[0089] In this application, terms such as “one embodiment,” “several embodiments,” “example,” “specific example,” or “several examples,” “one possible design,” etc., mean that the specific features, structures, materials, or properties described in conjunction with 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 refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or properties described can be combined in an appropriate manner in any one or more embodiments or examples. Notwithstanding the fact that, where there is no inconsistency, a person skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described herein.

[0090] Granulation is a crucial step in the production process of PTC heat-sensitive ceramic sheets, and the quality of the particulate powder material (abbreviated as particulate material) directly affects the appearance, mechanical performance, and temperature resistance characteristics of the boiling dryer of the PTC ceramic sheet. Granulation involves adding a certain amount of binder to the crushed powder material and blending it uniformly to form particulate powder material. Such powder material has relatively good fluidity and rollability, relatively good strength in the pressing process, and allows for the production of sheets that are resistant to delamination and cracking.

[0091] In industrial production, granulation is carried out using the spray drying method. The basic principle is to atomize powdered material containing a binder by spraying it into a granulation tower (also called a drying tower) with a sprayer. The drying tower has a drying cavity, and the atomized droplets in the drying cavity are dried into particulate powder by the hot airflow in the drying cavity and then discharged from the bottom of the drying cavity.

[0092] In related technologies, spray drying apparatuses generally employ centrifugal atomization drying for granulation. That is, by rapidly rotating an atomizing disc, a slurry with a solid content of 5%-50% is rapidly shaken from the atomizing disc to form fine droplets. At this time, clean air heated by a heater completes heat exchange in the main spray column, thereby achieving the objectives of drying and granulating the material. However, the particle size of the powder material produced by this granulation method is mainly affected by the rotation speed of the atomizing disc, and the particle size of the powder material produced by the above granulation method cannot meet the standard requirements.

[0093] Based on this, an embodiment of the present application provides a sprayer in which a liquid material inlet, a liquid material outlet, a gas inlet, a gas outlet, a liquid material passage, and a gas passage are installed in the sprayer body, and both the liquid material outlet and the liquid material inlet are connected to the liquid material passage, both the gas outlet and the gas inlet are connected to the gas passage, and the gas outlet is installed in the liquid material outlet, thereby shear-mixing the liquid material ejected from the liquid material outlet and the gas ejected from the gas outlet at the liquid material outlet, so that the liquid material is physically crushed by the gas and atomized to form fine droplets, and the fine droplets are rapidly dried by the action of a hot airflow in a drying cavity, and finally shrink to form dried spherical particulate material with a relatively small diameter.

[0094] In a spray drying system, the liquid material enters the drying cavity through the liquid material passage of the sprayer and out the liquid material nozzle, initiating the spray granulation drying process. This process is divided into three stages: atomization of the liquid material, drying and pelletizing of the atomized particles, and discharge of the particle powder material. The spray drying apparatus is the core equipment of the spray drying system.

[0095] The spray drying apparatus includes a drying cavity, and the sprayer is installed on the cavity wall of the drying cavity. The outlet end of the sprayer is located inside the drying cavity, and the inlet end of the sprayer is connected to the end of the material supply system. The sprayer, also called a spray gun, is an important component that sprays liquid material into the drying cavity at a constant pressure, atomizing and drying it within the drying cavity to form spherical particulate material.

[0096] As shown in Figures 1 to 4, Figure 1 is a schematic diagram of the structure of a sprayer 10 according to some embodiments of this application, Figure 2 is a cross-sectional view AA of Figure 1, Figure 3 is an enlarged view of the local structure at the liquid material nozzle 13 of Figure 2, and Figure 4 is a schematic diagram of the structure of a dispersion member 20 from one viewpoint according to some embodiments of this application. The embodiment of this application provides a sprayer 10, which includes a sprayer body 11, the sprayer body 11 being 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 both communicating with the liquid material passage 16, the gas outlet 15 and the gas inlet 14 both communicating with the gas passage 17, the gas outlet 15 being installed in the liquid material outlet 13, a dispersion member 20 being provided in the liquid material passage 16, the dispersion member 20 being installed in the liquid material outlet 13 and the dispersion member 20 dividing 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 embodiment of this application, both the liquid material outlet 13 and the liquid material inlet 12 are connected to the liquid material passage 16, and both the gas outlet 15 and the gas inlet 14 are connected to 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, thereby dispersing the liquid material passage 16 to form multiple sub-passages. When the liquid material flows through the liquid material passage 16 and the dispersion member 20, it flows through the sub-passages to the liquid material outlet 13, and the liquid material is dispersed by the dispersion member 20 within the liquid material passage 16. This increases the turbulence in the flow of the liquid material, causing it to flow further to the liquid material nozzle 13. As a result, the liquid material ejected from the liquid material nozzle 13 and the gas ejected from the gas nozzle 15 are shear-mixed at the liquid material nozzle 13. The liquid material is physically crushed and atomized by the gas to form fine droplets. These fine droplets form spherical shapes due to surface tension, and because they have a very large surface area, the moisture evaporates rapidly due to the action of the hot airflow, causing them to shrink and eventually form dried, relatively small-diameter spherical particle powder material.

[0098] As shown in Figures 3 and 4, in some embodiments, multiple 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 setup, when the liquid material flows through the dispersion member 20, some of the liquid material is blocked by the dispersion member 20, changes its path, and flows from the outer surface of the dispersion member 20 through multiple sub-passages to the liquid material outlet 13. After the liquid material is dispersed by the dispersion member 20 within the liquid material passage 16, it is divided by air at the liquid material outlet 13, which is advantageous for forming smaller droplets at the liquid material outlet 13.

[0100] In addition to forming multiple 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 to form multiple sub-passages inside the dispersion member 20, or multiple sub-passages may be formed between the outer surface of the dispersion member 20 and the inner wall of the liquid material passage 16, and then the dispersion member 20 may be designed in a lattice structure. This allows for the formation of multiple sub-passages both inside and on the outer surface of the dispersion member 20, which is more advantageous for the dispersion of the liquid material.

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

[0102] With the above-described installation, by dividing the liquid material passage 16 into multiple sub-passages along the circumferential direction within a cross-section perpendicular to the axial direction of the sprayer body 11, the turbulence of the liquid material is made more uniform, allowing it to be uniformly dispersed by the dispersion member 20, which is advantageous for forming smaller droplets at the liquid material outlet 13.

[0103] For example, the prism segment 21 may be a square prism, a triangular prism, or a polygonal prism such as a pentagonal prism. Of course, the dispersion member 20 may include the prism segment 21, or it may be designed as a cylindrical structure. In this case, the inner wall of the liquid material passage 16 may be composed of multiple 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. This is not specifically limited here.

[0104] As shown in Figures 3 to 5, Figure 5 is an exploded view of the sprayer 10 in Figure 1. In some embodiments, the prismatic segment 21 includes a first prismatic segment 211 and a second prismatic segment 212 that are connected, the circumscribing radius of the cross-section of the first prismatic segment 211 is greater than the circumscribing radius of the cross-section of the second prismatic segment 212, and the first prismatic segment 211 is located on the side of the second prismatic segment 212 facing the liquid material nozzle 13.

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

[0106] The circumscribed circle is defined as follows: Within the above cross-section, the contour of the prism segment 21 exhibits a polygonal shape, and the circle that intersects with each vertex of the polygon is called the circumscribed circle of the polygon.

[0107] With the above installation, in the cross-section perpendicular to the axial direction of the sprayer body 11, the size of the sub-passage located at the first prismatic segment 211 is smaller than the size of the sub-passage located at the second prismatic segment 212. That is, when the liquid material flows from the second prismatic segment 212 to the first prismatic segment 211, the space through which the liquid material can pass becomes smaller, which changes the flow velocity of the liquid material in the liquid material passage 16, increases the turbulence of the liquid material, and is advantageous for ejecting the liquid material from the liquid material outlet 13 at a constant angle, thereby forming smaller mist droplets at the liquid material outlet 13.

[0108] As shown in Figures 3, 6, and 7, Figure 6 is an exploded view of the sprayer 10 in Figure 1, and Figure 7 is a cross-sectional view of the nozzle member 30 in Figure 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 of the dispersion member 20 facing the liquid material nozzle 13, and the periphery of the nozzle member 30 is sealed to the inner wall of the liquid material passage 16, and the nozzle member 30 is provided with an ejection hole 31, which communicates with each of the sub-passages.

[0109] By installing the nozzle member 30 on the side of the dispersion member 20 facing the liquid material nozzle 13 and sealing 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, and by providing the nozzle member 30 with ejection holes 31, the liquid material is ejected at high speed from the ejection holes 31, and by improving the speed at which the liquid material is ejected from the liquid material nozzle 13, it is advantageous to form smaller droplets.

[0110] As shown in Figures 3 to 5, in some embodiments, the dispersion member 20 is loosely fitted to the inner wall of the liquid material passage 16, and the dispersion member 20 includes a contact column segment 22, which is located on the side of the rectangular column segment 21 toward the nozzle member 30, and a plurality of communication grooves 23 are provided on the side wall of the contact column segment 22, each communication groove 23 communicating with the nozzle 31 and at least one sub-passage. The loose fitting of the dispersion member 20 to the inner wall of the liquid material passage 16 and the provision of a plurality of communication grooves 23 on the side wall of the contact column segment 22 are advantageous in that, as 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, forming smaller droplets at the liquid material nozzle 13.

[0111] For example, two communication grooves 23 are provided in the side wall of the contact column segment 22. Of course, the number and size of the above communication grooves 23 are determined in conjunction with the flow velocity of the liquid material, the particle size of the particulate material, etc., and are not specifically limited here.

[0112] As shown in Figures 4 and 5, in some embodiments, the communication groove 23 is installed at an inclination with respect to the axial direction of the abutting column segment 22.

[0113] The connecting groove 23 is installed at an inclination with respect to the axial direction of the contact column segment 22. By changing the flow direction of the liquid material in the liquid material passage 16 in this way, a rotational vortex is formed at the point of communication between the connecting groove 23 and the liquid material passage 16, which is advantageous for cutting and dispersing the liquid material.

[0114] figure 7 As shown, in some embodiments, the ejection hole 31 includes a tapered hole segment 311 and a columnar hole segment 312, the columnar hole segment 312 being connected to the small end 3111 of the tapered hole segment 311, the large end 3112 of the tapered hole segment 311 into which a contact column segment 22 can be inserted, and one end of the communication groove 23 passing through the end of the contact column segment 22 toward the ejection member 30 and communicating with the tapered hole segment 311.

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

[0116] One end of the communication groove 23 penetrates the end of the contact column segment 22 toward the nozzle member 30 and communicates with the tapered hole segment 311. This causes the liquid material to be ejected at high speed in a spiral pattern from the ejection hole 31, and the liquid material is cut and dispersed by the air.

[0117] As shown in Figures 3 and 7, in some embodiments, the nozzle member 30 is tightly fitted with the liquid material passage 16.

[0118] The above-mentioned interference fit refers to a fit in which there is an interference allowance (including cases where the minimum interference allowance is equal to zero). That is, in a cross section perpendicular to the axial direction of the sprayer body 11, if the algebraic difference obtained by subtracting the size of the fitting liquid material passage 16 in each direction from the size of the nozzle member 30 in each direction is negative, then it is an interference fit.

[0119] The tight fit between the nozzle member 30 and the liquid material passage 16 firmly connects them, thereby reducing the probability that the nozzle member 30 will be ejected from the liquid material outlet 13 along with the liquid material when the liquid material flows to the liquid material outlet 13 at high speed. This improves the reliability of the sprayer 10 and extends its service life.

[0120] As shown in Figure 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 the liquid material nozzle 13.

[0121] By installing the position limiting unit 32, the nozzle member 30 is restricted to the liquid material nozzle 13 of the sprayer 10, thereby reducing the probability that the nozzle member 30 will be ejected from the liquid material nozzle 13, and thus reducing the probability that the nozzle member 30 will be ejected from the liquid material nozzle 13 and cause equipment failure.

[0122] As shown in Figure 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] An annular flange installed at one end of the liquid material passage 16 serves as a position limiting section 32. In this way, the position limiting section 32 reduces the probability of the nozzle member 30 being prevented from exiting the liquid material nozzle 13, thereby reducing the risk of equipment failure. Furthermore, 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 particulate 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, or an annular member may be installed at the liquid material outlet 13 of the liquid material passage 16. This annular member may be connected to the end face of the liquid material passage 16 near the liquid material outlet 13 by locking or bonding, and is used to prevent the outlet member 30 from coming out of the liquid material outlet 13, and is not specifically limited here.

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

[0126] By fitting the outer tube 111 onto the inner tube 112, a liquid material passage 16, a gas passage 17, a liquid material outlet 13, and a gas outlet 15 are formed, making assembly easy. Furthermore, by positioning the gas outlet 15 to surround the liquid material outlet 13, the liquid material ejected from the liquid material outlet 13 is sufficiently divided in each direction by the gas ejected from the gas outlet 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 sealed, and an opening is created in the tube wall of the outer tube 111. In this way, the liquid material inlet 12 and the gas inlet 14 are separated, making it easier to connect the material supply line 210 and the gas supply line, transporting the liquid material and air to the sprayer 10 respectively, and reducing the probability of mutual interference between the liquid material transport and the air transport processes.

[0128] As shown in Figures 3, 8, and 9, Figure 8 is a schematic structural diagram of the sprayer 10 in Figure 1 from one viewpoint, and Figure 9 is a cross-sectional view of Figure 8 at BB. In some embodiments, a sleeve 113 is fitted to the outside of the inner tube 112, the sleeve 113 is located at the end of the inner tube 112 where the liquid material nozzle 13 is installed, the first end 1131 of the sleeve 113 is sealed to the outer tube 111, the second end 1132 of the sleeve 113 is inserted into the outer tube 111 and sealed to the inner tube 112, the gas nozzle 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 wall of the sleeve 113, and each of the plurality of gas holes 1130 communicates with the liquid material passage 16 and the gas passage 17.

[0129] Multiple gas holes 1130 are provided along the circumferential direction on the peripheral wall of the sleeve 113, and all of the gas holes 1130 communicate with the liquid material passage 16 and the gas passage 17. In this way, some of the air in the gas passage 17 passes through the gas holes 1130 and enters the liquid material passage 16, increasing the turbulence in the flow of the liquid material in the liquid material passage 16, while the other portion of the air passes through the gas passage 17 and is ejected from the gas outlet 15, dividing the liquid material, which is advantageous for ensuring that the liquid material is sufficiently cut.

[0130] As shown in Figure 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 on different planes, the multiple gas holes 1130 are spaced apart 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 different planes mentioned above are two straight lines that are not on the same plane. Two straight lines that are on different planes cannot intersect or be parallel. The statement that the hole axis of the gas hole 1130 and the central axis of the sleeve 113 are straight lines on different planes means that the hole axis of each gas hole 1130 (dotted line M in the plane shown in Figure 9) is the central axis of the sleeve 113 (plane shown in Figure 9). Surface, for example Center point of sleeve 113 in Figure 9 It is perpendicular to ) does not intersect with or parallel to it.

[0132] Taking the gas hole 1130 corresponding to the central axis indicated by the dotted line M in the plane shown in Figure 9 as an example, the end of the central axis of this gas hole 1130 that is close to the central axis of the sleeve 113 is shifted to one side relative to the end that is farther from the central axis of the sleeve 113 (the center point of the sleeve 113 in Figure 9). The fact that the above-mentioned inclination direction is the same means that the central axes of each of the gas holes 1130 among the multiple gas holes 1130 are all shifted to the same side.

[0133] Each gas hole 1130 is designed as an inclined hole. By changing the direction of the gas in this way, some of the air enters the liquid material passage 16 via the gas holes 1130, forming a swirling flow at the point where the gas passage 17 and the liquid material passage 16 connect, thereby increasing the turbulence of the liquid material in the liquid material passage 16. Another portion divides the liquid material through the gas passage 17. The multiple gas holes 1130 are arranged at intervals along the circumferential direction of the sleeve 113, which is advantageous for further dispersing the liquid material more uniformly and obtaining a more uniform particulate material.

[0134] As shown in Figure 9, in some embodiments, the range of the inclination angle a of the hole 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 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 (dotted line M in the plane shown in Figure 9) and the first normal (dotted line N in the plane shown in Figure 9), and the first normal is the normal to the cylindrical surface on which the outer surface of the sleeve 113 is located at the point where it intersects with the hole axis of the gas hole 1130.

[0135] The inclination angle is an important parameter in the design process of the sprayer 10. When the inclination angle is less than 15° or greater than 60°, the amount of air in the gas passage 17 entering the liquid material passage 16 is relatively small, preventing the formation of a swirling flow. Additionally, the amount of gas ejected from the gas outlet 15 decreases, resulting in insufficient fragmentation of the liquid material and a particle size that does not meet the requirements. Increasing the gas volume allows for sufficient fragmentation of the liquid material when forming a swirling flow in the liquid material passage 16, increasing the amount of gas ejected from the gas outlet 15. This results in a relatively small particle size and causes air waste.

[0136] By designing the inclination angle of the gas holes 1130 to be within the above range, the air in the gas passage 17 forms a rotational vortex at the connection point between the gas holes 1130 and the liquid material passage 16, which not only increases the turbulence of the liquid material but also allows the amount of gas at the gas outlet 15 to sufficiently divide the liquid material at the liquid material outlet 13, forming a particle size that meets the requirements, thereby achieving the objective of balancing particle size and low air usage.

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

[0138] With the above setup, air enters the liquid material passage 16 uniformly through multiple gas holes 1130, and the liquid material is uniformly divided by the gas, which is advantageous for the uniformity of the particulate material.

[0139] The equal pitch between two adjacent gas holes 1130 includes the fact that the angle formed by the axes of the two adjacent gas holes 1130 is perfectly equal, and may also include the fact that the angle formed by the axes of the two adjacent gas holes 1130 is approximately equal within a certain range, and this is not specifically limited here.

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

[0141] The tapering shape described above refers to the fact that the cavity wall 51 of the pipe cavity 114 is installed at an angle along the axial direction of the sleeve 113, causing the sleeve 113 to take on a roughly funnel shape.

[0142] By installing the gas nozzle 15 at the narrow end of the tapered tube cavity 114, air collects at the gas nozzle 15 along the cavity wall 51 of the tube cavity 114, improving the velocity of air ejection. In this way, the air ejected from the gas nozzle 15 is sprayed inclined from all sides toward the center of the liquid material nozzle 13, which is advantageous for better breaking up the liquid material and making the particulate material more uniform, thereby obtaining relatively small particle sizes.

[0143] As shown in Figure 3, in some embodiments, the outer tube 111 includes an outer tube body 1111 and a housing tube 1112, one end of the housing tube 1112 being detachably connected to the outer tube body 1111, the other end of the housing tube 1112 being provided with a mounting hole 1110, the first end 1131 of the sleeve 113 being fitted into the mounting hole 1110 and inserted, and the second end 1132 of the sleeve 113 being inserted into the housing tube 1112.

[0144] The above installation is advantageous in improving the reliability of the connection between the outer tube 111 and the sleeve 113. Furthermore, the housing tube 1112 is detachably connected to the outer tube body 1111, thus facilitating the attachment and detachment of the outer tube 111 and the sleeve 113 for inspection and the replacement of the sleeve 113.

[0145] As shown in Figure 3, in some embodiments, the inner tube 112 includes an inner tube body 1121 and a discharge header tube 1122 that is detachably connected to the inner tube body 1121, the discharge header tube 1122 being installed inside the housing tube 1112, the pipe opening of the discharge header tube 1122 away from the inner tube body 1121 being a liquid material discharge outlet 13, and a sleeve 113 being fitted over the discharge header tube 1122.

[0146] The inner pipe body 1121 and the discharge header pipe 1122 are connected in a detachable manner, thus facilitating the attachment, removal, inspection, and replacement of the inner pipe 112 and sleeve 113. Furthermore, the sleeve 113 is fitted onto the discharge header pipe 1122, improving the strength of the connection point between the sleeve 113 and the discharge header pipe 1122, thereby improving the reliability of the sprayer 10.

[0147] The above-mentioned detachable connections include, but are not specifically limited to, locks, screws, etc.

[0148] As shown in Figure 3, in some embodiments, an annular connecting flange 115 is provided on the circumferential wall of the inner tube 112, and the connecting 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 which the stopper portion 1152 is larger than the diameter of the fitting portion 1151, the fitting portion 1151 is inserted to fit into the opening of the second end 1132 of the sleeve 113, and the stopper portion 1152 is stopped at the opening edge of the second end 1132 of the sleeve 113.

[0149] With the above installation, the connecting flange 115 takes on a stepped shape, and the fitting portion 1151 is inserted into the pipe opening of the second end 1132 of the sleeve 113, improving the connection strength between the inner pipe 112 and the sleeve 113. The installation of the stopper portion 1152 reduces the movement of the sleeve 113 relative to the inner pipe 112 along the axial direction of the outer pipe 111, ensuring a secure connection between the inner pipe 112 and the sleeve 113.

[0150] As shown in Figure 3, in some embodiments, a sealing material 60 is installed at the connection point along the axial direction of the inner tube 112 between the inner tube body 1121 and the ejection header tube 1122, and the sealing material 60 has a through hole 61 through which the liquid material passage 16 passes.

[0151] The installation of the sealing material 60 not only improves the sealing performance of the connection point between the inner pipe body 1121 and the discharge header pipe 1122 along the axial direction of the inner pipe 112, but also provides a certain buffering effect in certain cases.

[0152] The sealing material 60 may be made of an elastic material, such as an elastic sealing ring. In this way, the sealing material 60 can perform a certain cushioning effect and can seal the gap created by the installation between the discharge header pipe 1122 and the inner pipe body 1121, thereby improving the reliability of the connection between the discharge header pipe 1122 and the inner pipe body 1121.

[0153] As shown in Figures 3, 8, and 10, Figure 10 is a cross-sectional view of CC in Figure 8. In some embodiments, a support member 40 is provided inside the outer tube body 1111, and the support member 40 is installed at the end of the outer tube body 1111 and supports the outer tube body 1111 and the inner tube 112.

[0154] The outer tube body 1111 is generally elongated, and the support member 40 is installed at the end of the outer tube body 1111. The support member 40 provides radial support to the outer tube 111, thereby reducing deformation of the outer tube 111, strengthening the connection between the outer tube 111 and the inner tube 112, and further improving the reliability of the sprayer 10.

[0155] The term "elongated" refers to the fact that the size of the outer tube body 1111 along its axial direction is larger than its size along its radial direction.

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

[0157] The above-mentioned integrated structure includes an integrated structure formed by integral molding, welding, or bonding. When both the outer tube body 1111 and the support member 40 are made of metal, both may be integrally molded by casting or formed into an integrated structure by welding. When one of them is made of a non-metallic material, it may be integrally molded by injection molding or formed into an integrated structure by bonding, etc., and this is not specifically limited here.

[0158] As shown in Figure 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, with a space formed between two adjacent support arms 41 through which air can pass.

[0159] With the above installation, the support arm 41 can contact the outer tube 111 and the inner tube 112 along the radial direction when the inner tube 112 or the outer tube 111 deforms, thereby providing radial support 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 sprayer 10, and the resulting space allows air to pass through, thereby achieving the objective of simultaneously connecting the inner tube 112 and the outer tube 111 and transporting air.

[0160] For example, the support member 40 includes three support arms 41 arranged along the circumferential direction of the inner tube 112, and three air-passable spaces are formed along the circumferential direction of the inner tube 112 by forming an air-passable space between two adjacent support arms 41.

[0161] As shown in Figures 11 and 12, Figure 11 is a schematic diagram of the structure of a spray drying system according to some embodiments of the present application, and Figure 12 is a schematic diagram of the connections between the spray drying apparatus 100 and the material supply system 200, gas supply system 300, and drying system 400 in Figure 11. Embodiments of the present application further provide a spray drying apparatus 100 which includes a drying cavity 50 and the sprayer 10 of the above embodiment, the sprayer 10 being attached to the cavity wall 51 of the drying cavity 50.

[0162] In the spray drying apparatus 100 of the embodiment of this application, since this spray drying apparatus 100 includes the sprayer 10 according to the above embodiment, this spray drying apparatus 100 also has the same technical effects as the aforementioned sprayer 10, and will not be explained further here.

[0163] The above-mentioned attachment of the sprayer 10 to the cavity wall 51 of the drying cavity 50 means that the sprayer 10 is attached to the cavity wall 51 of the drying cavity 50 by a screw or clip connection method, thereby positioning the liquid material nozzle 13 and gas nozzle 15 of the sprayer 10 inside the drying cavity 50. In this way, the liquid material is atomized and dried in the drying cavity 50 after being ejected from the liquid material nozzle 13, forming it in one step, which greatly improves the spray granulation efficiency and facilitates the installation and inspection of the sprayer 10.

[0164] The liquid material enters the drying cavity 50 from the liquid material outlet 13 of the sprayer 10, initiating the spray granulation drying process. The specific process is divided into three stages: atomization of the liquid material, drying and pelletizing of the atomized particles, and discharge of the particle powder material. The above one-step molding means that all three stages are operated by one person within the drying cavity 50 and completed in a single device, resulting in high efficiency and energy savings.

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

[0166] By installing the sprayer 10 on the top wall of the drying cavity 50, the mist droplets ejected from the liquid material nozzle 13 of the sprayer 10 descend within the drying cavity 50 by spiral hot air, resulting in a relatively high utilization rate of the drying space inside the drying cavity 50.

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

[0168] As shown in Figure 12, in some embodiments, there are multiple sprayers 10. For example, three sprayers 10 are installed on the cavity wall 51 of the drying cavity 50.

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

[0170] Of course, the number of sprayers 10 may be three, or it may be two, four, five, or any other number. The sprayers 10 may be uniformly distributed on the top wall of the drying cavity 50, or uniformly distributed on the side walls of the drying cavity 50, or randomly distributed on the top wall or side walls. The arrangement is not specifically limited here.

[0171] As shown in Figures 11 to 15, Figure 13 is a schematic diagram of the structure of the material supply system 200 in Figure 11, Figure 14 is a schematic diagram of the structure of the drying system 400 in Figure 11, and Figure 15 is a schematic diagram of the structure of the dust removal system 500 in Figure 11. 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 apparatus 100 in the above embodiment, wherein the material supply system 200 communicates with the liquid material inlet 12 of the sprayer 10, and the gas supply system 300 communicates with the gas inlet 14 of the sprayer 10.

[0172] In the spray drying system of the embodiment of this application, since this spray drying system includes the spray drying apparatus 100 according to the above embodiment, this spray drying system also has the same technical effects as the aforementioned spray drying apparatus 100, and will not be explained further here.

[0173] As shown in Figures 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, where 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 sprayer 10, the material supply line 210 is provided with a transport pump and a first control valve 1, 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, and a second control valve 2 is provided in the water supply line.

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

[0175] Here, the water storage device 230 is a device that primarily stores water, and may also be a water storage tank.

[0176] By installing a water storage device 230 within the material supply system 200, liquid material transport and water transport share the material supply line 210. When the spray dryer 100 is not granulating, the water supply line 250 is connected to the material supply line 210 of the existing material supply system 200. A transport pump then transports water from the water storage device 230 to the liquid material passage 16 of the sprayer 10. As the water flows through the liquid material passage 16, it can wash away any residue such as liquid material, thereby ensuring that the liquid material passage 16 remains clean. Thus, a single material supply line 210 can supply material to the sprayer 10 and clean the sprayer 10. In this way, only the water storage device 230 and a second control valve 2 that controls the line switching need to be added to the existing material supply system 200. This results in relatively low modification costs for the material supply system 200, making it advantageous for market adoption, and also reduces labor costs by eliminating the process of removing and cleaning the sprayer 10.

[0177] As shown in Figures 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 communicating with a gas inlet 14, the second gas supply line 320 communicating with a liquid material inlet 12, and a third control valve 3 is provided in the second gas supply line 320.

[0178] By installing two gas supply lines, it is possible to control the opening and closing of the third control valve 3, thereby switching between transporting gas into the liquid material passage 16 of the sprayer 10 to remove residual liquid material and water, and transporting gas into the gas passage 17. In this way, the process of removing and cleaning the sprayer 10 is eliminated, resulting in significant savings in labor costs.

[0179] It should be explained that the first gas supply line 310 and the second gas supply line 320 may use the same gas source to supply air, or they may use different gas sources to supply air. Generally, a fourth control valve 9 is installed in the first gas supply line 310, and switching between the first gas supply line 310 and the second gas supply line 320 is achieved by controlling the third control valve 3 and the fourth control valve 9. The fourth control valve 9 may adjust 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 conserve gas consumption, the pressure in the second gas supply line 320 is set lower than the pressure in the first gas supply line 310.

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

[0181] Here, the plunger pump 4 is an important component of the hydraulic system. It achieves oil absorption and pressurized oil by changing the volume of the seal operating chamber through the reciprocating motion of the plunger in the cylinder. The plunger pump 4 has advantages such as high rated pressure, a compact structure, high efficiency, and easy flow rate adjustment.

[0182] Here, the diaphragm pump 5 protects the plunger and pump cylinder by separating the liquid being transported from them using the diaphragm. The diaphragm pump 5 is a special type of positive displacement pump. It sucks in and discharges liquid by changing the volume of the working chamber through the reciprocating motion of the diaphragm seat. Here, a positive displacement pump is a pump that transports liquid using a change in volume within the pump cylinder.

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

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

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

[0186] Here, the pulsation damper 6 is a pressure vessel for eliminating liquid pressure pulsations or flow rate pulsations within the pipe, and can perform functions such as stabilizing the fluid pressure and flow rate, eliminating pipe vibrations, protecting downstream instruments and equipment, and improving pump volumetric efficiency.

[0187] The back pressure valve 7 regulates the outlet pressure of the plunger pump 4, allowing the material supply line 210 to be maintained at a constant pressure. By installing a pulsation damper 6 and using the back pressure valve 7 and pulsation damper 6 in combination, it is possible to reduce the influence of pulses on the flow rate or pressure output from the plunger pump 4, as well as mitigate the shock effect on the liquid material flow.

[0188] Of course, the material supply line 210 may be equipped with only a pulsation damper 6 or a back pressure valve 7, and this is not specifically limited here.

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

[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 receives signals from an industrial automation control system to drive the valve and change the size of the cross-sectional area between the valve core and the valve seat, thereby controlling process parameters such as the flow rate, temperature, and pressure of the pipe medium, and primarily serves to automatically adjust the pressure within the material supply line 210.

[0192] The check valve 280 allows fluids (such as liquid materials and water) to flow only in one direction, from the inlet to the outlet, but prevents backflow, primarily serving to prevent backflow of fluids within the material supply line 210.

[0193] As shown in Figure 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, which can remove ferromagnetic impurities mixed into the material, ensuring the safe and normal operation of machinery such as crushers and polishers in the transport system, and effectively reducing the probability of accidents caused by impurities, thereby improving 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 attached to pressure reducing valves, pressure relief valves, constant water level valves, and other inlet end devices, and serves primarily to filter out particulate impurities from water or liquid material.

[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. This allows for the filtration of impurities, particularly metallic impurities, in the liquid material, thereby improving the purity of the liquid material and reducing the probability of malfunctions occurring in equipment such as the plunger pump 4 or the sprayer 10 due to impurities, especially metallic impurities, in the liquid material.

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

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

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

[0200] The ratio of gas supply to material supply is the main parameter of spray granulation in the sprayer 10. If this ratio is too small, i.e., if the amount of gas supply of air consumed per liter of liquid material is less than 1 cubic meter, the liquid material will not be sufficiently pulverized, and the particle size will not meet the requirements. If this ratio is too large, i.e., if the amount of gas supply of air consumed per liter of liquid material is greater than 15 cubic meters, the particle size can meet the requirements, but it will result in air waste. By designing the ratio of gas supply to material supply within the above range, the liquid material is sufficiently pulverized in this way, the particle size meets the requirements, and air waste is avoided, thereby achieving the objective of balancing particle size and low gas consumption.

[0201] In some embodiments, the ratio of the pressure in the first gas supply line 310 to the pressure in 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 that 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 the main parameters of spray granulation in the sprayer 10, and the difficulty of spray granulation lies in how to rationally set the pressure values ​​of the first gas supply line 310 and the material supply line 210 and find the equilibrium point of the ratio of the pressure of the first gas supply line 310 to the pressure of the material supply line 210.

[0203] By designing the ratio of the pressure in the first gas supply line 310 to the pressure in the material supply line 210 to 0.6:3.5, the particle size obtained after passing through the sprayer 10 of the spray drying apparatus 100 is D50 = 3 microns. μ m)-10 microns μm) Technical target and D50≦8 μ m or less, D90≦25 μ The overall performance index of m is met, the requirements are met and it is relatively uniform, and gas consumption is low, thereby achieving the objective of balancing particulate material size with low gas consumption.

[0204] As shown in Figures 11 and 13, in some embodiments, the spray drying system further includes a drying system 400, which includes a blower line 410, a heater 420, a first fan 430, and a second filter 440, with one end of the blower line 410 connected to the second filter 440 and the other end communicating with the drying cavity 50, and the first fan 430 and heater 420 installed in the blower line 410.

[0205] Here, heater 420 primarily serves to heat the air.

[0206] Here, the second filter 440 primarily serves the purpose of filtering out impurities from 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 system 400 is connected to the drying cavity 50, and after the liquid material is transported into the drying cavity 50 via the sprayer 10, the drying system 400 then transports hot air into the drying cavity 50 to dry the mist droplets, thereby forming the liquid material in a one-step process within the drying cavity 50 to create particulate material.

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

[0210] Since metal oxides tend to form on the inner wall of the heater 420 after the air is heated inside the heater 420, by installing a third filter 450 on the outlet side of the heater 420, impurities in the hot air, especially metal oxide impurities formed inside the heater 420, can be filtered out before the hot air enters the sprayer 10. This reduces the risk of the sprayer 10 short-circuiting due to metal oxide impurities entering the sprayer 10, and further improves the reliability of the spray drying device 100.

[0211] Figures 11 and 1 4 As shown, in some embodiments, the second filter 440 is a low-performance or medium-performance filter, and the third filter 450 is a high-performance filter.

[0212] Here, the low-performance filters are mainly 5 μ It is used to filter dust particles larger than 1 cubic meter. Low-performance filters come in three styles: plate type, folding type, and bag type. The outer frame material can be paper frame, aluminum frame, or galvanized iron frame. The filtration material can be nonwoven fabric, nylon mesh, activated carbon filter media, or metal mesh. The protective mesh can be double-sided injection-molded steel mesh or double-sided galvanized steel mesh.

[0213] Here, the medium-performance filter is mainly 1 μ m-5 μ It is used to capture dust particles and various suspended solids, with a filtration efficiency of 60% to 95%. Furthermore, it can be used as a front-end filter for high-performance filtration, reducing the load on the high-performance filter and extending its service life.

[0214] Here, high-performance filters are mainly used as terminal filters in various filtration systems, 0.5 μ It is used to capture dust particles larger than 1 cubic meter and various suspended particles. High-performance filters are manufactured using ultrafine glass fiber paper as the filter material, folded into segmented plates using materials such as plywood and aluminum foil, sealed with a new type of polyurethane sealant, and 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 this application, the air is pre-filtered before entering the heater 420 to remove impurities from the air, and after passing through the heater 420, it is secondarily filtered. Since metal oxides tend to form on the inner wall of the heater 420 after the air is heated inside the heater 420, a high-performance filter is used as a third filter 450 to completely filter the hot air before it enters the sprayer 10, filtering out impurities in the hot air, especially metal oxide impurities formed inside the heater 420. This reduces the risk of the sprayer 10 short-circuiting due to metal oxide impurities entering the sprayer 10, and further improves the reliability of the spray drying apparatus 100.

[0216] As shown in Figures 11 and 15, in some embodiments, the material supply system 200 further includes a dust removal system 500 connected to the spray dryer 100, the dust removal system 500 including a cyclone separator 510, a cloth bag type dust remover 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 with relatively large inertial centrifugal forces by shaking them against the outer wall surface through rotational motion caused by the introduction of airflow in the tangential direction.

[0218] Here, the cloth bag type dust collector 520, also known as a bag dust collector, is a dry dust collector. It is suitable for collecting fine, dry, and non-fibrous dust. The filter bag of the cloth bag type dust collector 520 is made of woven filter cloth or non-woven felt, and filters the dust-containing gas using the filtering action of the fibrous fabric. After the dust-containing gas enters the bag dust collector, larger particles with a high specific gravity settle due to gravity and fall into the ash hopper, and when the gas containing fine dust passes through the filter material, the dust is blocked and remains, and the gas is purified.

[0219] Here, the second fan 530 is a suction fan that primarily draws fine particulate material from the drying cavity 50 into the equipment other than the drying cavity 50 along with dry air, and the second fan 530 may be a centrifugal fan.

[0220] Fine particulate material in the dry cavity 50 is transported along with dry air to the cyclone separator 510, where it is effectively separated. The fine particulate material is then collected in a collection tube at the bottom of the separator, and the remaining exhaust gas, which contains a very small amount of fine particulate material, is drawn into a dust collector by a second fan 530, where it is again collected and detoxified. The treated exhaust gas is then discharged from the chimney, thereby reducing environmental pollution.

[0221] Embodiments of this application further provide a method for controlling a spray drying system, which includes closing a first control valve 1 and opening a second control valve 2 after the spray drying apparatus 100 has completed drying and granulation of the liquid material, thereby causing the transport pump to transport water from the water storage apparatus 230 through the material supply line 210 to the liquid material passage 16 of the sprayer 10, and closing the transport pump after a predetermined time has elapsed.

[0222] After the spray drying apparatus 100 has completed drying and granulation of the liquid material, the above steps are adopted. When the spray drying apparatus 100 is not in granulation operation, the transport pump, via the material supply line 210 of the existing material supply system 200, transports water from the water reservoir 230 to the liquid material passage 16 of the sprayer 10. The water flows through the liquid material passage 16, washing away any residue such as liquid material, thereby ensuring that the liquid material passage 16 is clean. Thus, only the water reservoir 230 and the second control valve 2 that controls the switching of the material supply line 210 need to be added to the existing material supply system 200. This results in relatively low modification costs for the material supply system 200 and reduces labor costs by eliminating the process of removing and cleaning the sprayer 10.

[0223] In some embodiments, after closing the transport pump, the gas in the second gas supply line 320 is further opened to allow the gas to enter the liquid material passage 16 of the atomizer 10.

[0224] By adding the above step after closing the transport pump, when the spray dryer 100 is not in granulation operation, the sprayer 10 can transport gas to the liquid material passage 16. The gas can remove residues such as liquid material and water from the liquid material passage 16, thereby keeping the liquid material passage 16 of the sprayer 10 clean and dry. In this way, it is advantageous to extend the service life of the sprayer 10 by keeping the liquid material passage 16 clean and dry without having to remove and clean the sprayer 10.

[0225] As shown in Figures 1 to 5, in one embodiment, the sprayer 10 includes a sprayer body 11, 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 both communicate with the liquid material passage 16, the gas outlet 15 and the gas inlet 14 both communicate with the gas passage 17, the gas outlet 15 is installed in 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 in the liquid material outlet 13 and divides the liquid material passage 16 into a plurality of sub-passages that communicate with the liquid material outlet 13.

[0226] In the atomizer 10 of the embodiment of this application, both the liquid material nozzle 13 and the liquid material inlet 12 are connected to the liquid material passage 16, and both the gas nozzle 15 and the gas inlet 14 are connected to the gas passage 17. The gas nozzle 15 is installed in the liquid material nozzle 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 nozzle 13 and the gas ejected from the gas nozzle 15 are shear-mixed at the liquid material nozzle 13. As a result, the liquid material is physically crushed by the gas and atomized to form fine droplets. These fine droplets form a spherical shape due to surface tension, and because the droplets have a very large surface area, the moisture evaporates rapidly due to the action of the hot airflow, causing them to shrink and eventually form a dried, relatively small-diameter spherical particle powder material.

[0227] As shown in Figures 3 to 5, the dispersion member 20 includes a prismatic segment 21 and a contact prismatic segment 22, the contact prismatic segment 22 being located on the side of the prismatic segment 21 facing the nozzle member 30, and the side wall of the contact prismatic segment 22 is provided with two communication grooves 23 installed at an inclination with respect to the axial direction of the contact prismatic segment 22, each communication groove 23 communicating with the nozzle 31 and at least one sub-passage, the prismatic segment 21 includes a connected first prismatic segment 211 and a second prismatic segment 212, the circumscribing radius of the cross-section of the first prismatic segment 211 being greater than the circumscribing radius of the cross-section of the second prismatic segment 212, and the first prismatic segment 211 being located on the side of the second prismatic segment 212 facing the liquid material nozzle 13.

[0228] As shown in Figure 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, and the large end 3112 of the tapered hole segment 311 is into which the abutment column segment 22 can be inserted. One end of the communication groove 23 passes through the end of the abutment column segment 22 toward the ejection outlet member 30 and communicates with the tapered hole segment 311.

[0229] As shown in Figures 3, 6, and 7, a nozzle member 30 is provided at the liquid material nozzle 13, the nozzle member 30 is tightly fitted with the liquid material passage 16, the nozzle member 30 is located on the side of the dispersion member 20 facing the liquid material nozzle 13, and the periphery of the nozzle member 30 is sealed to the inner wall of the liquid material passage 16, and an ejection hole 31 is provided in the nozzle member 30, the ejection hole 31 is in communication with each of the sub-passages.

[0230] As shown in Figure 3, an annular flange installed at one end of the liquid material passage 16 forms a position limiting portion 32, which is used to prevent the nozzle member 30 from exiting the liquid material nozzle 13. 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.

[0231] As shown in Figure 3, the sprayer body 11 includes an outer tube 111 and an inner tube 112 drilled inside the outer tube 111, the outer tube 111 includes an outer tube body 1111 and a housing tube 1112, one end of the housing tube 1112 is detachably connected to the outer tube body 1111, and the other end of the housing tube 1112 is provided with a mounting hole 1110, the first end 1131 of the sleeve 113 fits into the mounting hole 1110 and is inserted, the second end 1132 of the sleeve 113 is inserted into the housing tube 1112, the inner tube 112 includes an inner tube body 1121 and a discharge header tube 1122 detachably connected to the inner tube body 1121, the discharge header tube 1122 is installed inside the housing tube 1112, the pipe opening of the discharge header tube 1122 away from the inner tube body 1121 is a liquid material discharge outlet 13, and the sleeve 113 is a discharge header By being fitted onto the pipe 1122, the gas nozzle 15 is positioned surrounding the liquid material nozzle 13. The sleeve 113 is located at the end of the inner pipe 112 where the liquid material nozzle 13 is installed. The first end 1131 of the sleeve 113 is sealed to the outer pipe 111, and the second end 1132 of the sleeve 113 is inserted into the outer pipe 111 and sealed to the inner pipe 112. The sleeve 113 has a tapered pipe cavity 114, and the gas nozzle 15 is located at the small end of the pipe cavity 114. The gas nozzle 15 is located at the first end 1131 of the sleeve 113 and is formed between the sleeve 113 and the inner pipe 112. Multiple gas holes 1130 are provided along the circumferential direction on the peripheral wall of the sleeve 113, and all of the multiple gas holes 1130 communicate with the liquid material passage 16 and the gas passage 17.

[0232] As shown in Figure 3, an annular connecting flange 115 is provided on the circumferential wall of the inner tube 112. The connecting 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 the opening of the second end 1132 of the sleeve 113, and the stopper portion 1152 is a stopper on the opening edge of the second end 1132 of the sleeve 113. A sealing material 60 is installed at the connection point between the inner tube body 1121 and the ejection header pipe 1122 along the axial direction of the inner tube 112. The sealing material 60 has a through-hole 61 through which the liquid material passage 16 passes.

[0233] As shown in Figure 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 on 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 Figure 9 as an example, the end of the central axis of this gas hole 1130 that is close to the central axis of the sleeve 113 is shifted to one side relative to the end that is farther from the central axis of the sleeve 113 (the center point of the sleeve 113 in Figure 9). The fact that the inclination direction is the same means that the central axes of each of the multiple gas holes 1130 are all shifted to the same side. The 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 (dotted line M in the plane shown in Figure 9) and the first normal (dotted line N in the plane shown in Figure 9). The first normal is the normal to the cylindrical surface on which the outer surface of the sleeve 113 is located, at the point where it intersects with the hole axis of the gas hole 1130.

[0234] As shown in Figures 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 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, with a space for air to pass between two adjacent support arms 41.

[0235] Finally, it should be noted that the above embodiments are merely illustrative of the technical concepts of this application and do not limit them. While the application has been described in detail with reference to the above embodiments, those skilled in the art will understand that the technical concepts described in the above embodiments can still be modified, or some or all of their technical features can be replaced with equivalent ones. Such modifications or replacements do not cause the essence of the technical concept to deviate from the scope of the technical concepts in each embodiment of this application, and they should be included within the scope of the claims and specification of this application. In particular, unless there is a structural conflict, each technical feature referred to 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 concepts included within the claims.

Claims

1. A sprayer (10) for producing particulate powder material, comprising a sprayer body (11), the sprayer body (11) 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), wherein the liquid material outlet (13) and the liquid material inlet (12) both communicate with the liquid material passage (16), the gas outlet (15) and the gas inlet (14) both communicate with the gas passage (17), the gas outlet (15) is installed in the liquid material outlet (13), a dispersion member (20) is provided in the liquid material passage (16), the dispersion member (20) is installed in 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). A plurality of sub-passages (160) are formed between the outer surface of the dispersion member (20) and the inner wall of the liquid material passage (16). The dispersion member (20) includes a prismatic segment (21), and the sub-passages (160) are formed between each side wall of the prismatic segment (21) and the inner wall of the liquid material passage (16). The prism segment (21) includes a first prism segment (211) and a second prism segment (212) that are connected, wherein the circumradius of the cross-section of the first prism segment (211) is greater than the circumradius of the cross-section of the second prism segment (212), and the first prism segment (211) is located on the side of the second prism segment (212) facing the liquid material nozzle (13), in the sprayer (10).

2. The sprayer (10) according to claim 1, wherein a nozzle member (30) is provided at the liquid material nozzle (13), the nozzle member (30) is located on the side of the dispersion member (20) facing the liquid material nozzle (13), the periphery of the nozzle member (30) is sealed to the inner wall of the liquid material passage (16), the nozzle member (30) is provided with a discharge hole (31), and the discharge hole (31) is in communication with each of the sub-passages (160).

3. The sprayer (10) according to claim 2, wherein 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 of the rectangular column segment (21) toward the nozzle member (30), a plurality of communication grooves (23) are provided in the side wall of the contact column segment (22), and each of the communication grooves (23) communicates with the nozzle (31) and at least one of the sub-passages (160).

4. The sprayer (10) according to claim 3, wherein the communication groove (23) is installed at an inclination with respect to the axial direction of the contact column segment (22).

5. The sprayer (10) according to claim 4, wherein 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 into which the abutment column segment (22) can be inserted, and one end of the communication groove (23) penetrates the end of the abutment column segment (22) toward the nozzle member (30) and communicates with the tapered hole segment (311).

6. The sprayer (10) according to claim 5, wherein the nozzle member (30) is tightly fitted with the liquid material passage (16).

7. The sprayer (10) according to claim 6, wherein 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 coming out of the liquid material nozzle (13).

8. The sprayer (10) according to claim 7, wherein 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 nozzle member (30), and the central hole of the annular flange is the liquid material nozzle (13).

9. The sprayer body (11) includes an outer tube (111) and an inner tube (112) drilled 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 outlet (13) is the tube opening at one end of the inner tube (112), and the liquid material outlet (13) is located at the tube opening at one end of the outer tube (111), and the gas outlet (15) is installed surrounding the liquid material outlet (13), as described in claim 1, the sprayer (10).

10. A sprayer (10) according to claim 9, wherein a sleeve (113) is fitted to the outside of the inner tube (112), the sleeve (113) is located at the end of the inner tube (112) where the liquid material nozzle (13) is installed, the first end (1131) of the sleeve (113) is sealed to the outer tube (111), the second end (1132) of the sleeve (113) is inserted into the outer tube (111) and sealed to the inner tube (112), the gas nozzle (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), and each of the plurality of gas holes (1130) communicates with the gas nozzle (15) and the gas passage (17).

11. Each of the gas holes (1130) is an inclined hole, the axis of the gas hole (1130) and the central axis of the sleeve (113) are straight lines on different planes, and the plurality of gas holes (1130) are arranged at intervals along the circumferential direction of the sleeve (113), as described in claim 10.

12. The sprayer (10) according to claim 11, wherein 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°.

13. The sprayer (10) according to claim 12, wherein the pitch between two adjacent gas holes (1130) is equal.

14. The sprayer (10) according to claim 13, wherein the sleeve (113) has a tapered tube cavity (114), and the gas nozzle (15) is located at the small end (3111) of the tube cavity (114).

15. The sprayer (10) according to claim 14, wherein the outer tube (111) includes an outer tube (111) body and a housing tube (1112), one end of the housing tube (1112) is detachably connected to the outer tube (111) body, a mounting hole (1110) is provided at the other end of the housing tube (1112), the first end (1131) of the sleeve (113) is fitted into the mounting hole (1110) and the second end (1132) of the sleeve (113) is inserted into the housing tube (1112).

16. The sprayer (10) according to claim 15, wherein the inner tube (112) includes an inner tube (112) body and a discharge header tube (1122) detachably connected to the inner tube (112) body, the discharge header tube (1122) is installed inside the housing tube (1112), the pipe opening of the discharge header tube (1122) away from the inner tube (112) body is the liquid material discharge outlet (13), and the sleeve (113) is fitted onto the discharge header tube (1122).

17. The sprayer (10) according to claim 16, wherein an annular connecting flange (115) is provided on the circumferential wall of the inner tube (112), and the connecting 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 the pipe opening of the second end (1132) of the sleeve (113), and the stopper portion (1152) is stopped at the pipe opening edge of the second end (1132) of the sleeve (113).

18. The sprayer (10) according to claim 17, wherein a support member (40) is provided inside the outer tube (111) body, the support member (40) is installed at the end of the outer tube (111) body and supports the outer tube (111) body and the inner tube (112).

19. The sprayer (10) according to claim 18, wherein the support member (40) includes a plurality of support arms (41) arranged along the circumferential direction of the inner pipe (112), and a space through which air can pass is formed between two adjacent support arms (41).

20. A spray drying apparatus (100) comprising a drying cavity (50) and a sprayer (10) according to any one of claims 1 to 19, wherein the sprayer (10) is attached to the cavity wall (51) of the drying cavity (50).

21. A spray drying system (400) comprising a material supply system (200), a gas supply system (300), and a spray drying apparatus (100) according to claim 20, wherein the material supply system (200) communicates with a liquid material inlet (12) of the sprayer (10), and the gas supply system (300) communicates with a gas inlet (14) of the sprayer (10).

22. 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) is in communication with the material storage device (220), and the other end is in communication with the liquid material inlet (12) of the sprayer (10). A transport pump and a first control valve (1) are provided in the material supply line (210), and the first control valve (1) is installed between the transport pump and the material storage device (220). The spray drying system (400) according to claim 21, wherein 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), and a second control valve (2) is provided in the water supply line (250).

23. The spray drying system (400) according to claim 22, wherein 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) communicating with the gas inlet (14), the second gas supply line (320) communicating with the liquid material inlet (12), and a third control valve (3) is provided in the second gas supply line (320).

24. The spray drying system (400) according to claim 23, wherein 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).

25. The spray drying system (400) according to claim 24, wherein 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).

26. The spray drying system (400) according to claim 25, wherein 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).

27. The spray drying system (400) according to claim 26, wherein the range of the ratio between the amount of gas supplied from the first gas supply line (310) to the sprayer (10) and the amount of material supplied from the material supply line (210) to the sprayer (10) is 1 to 15, and the range of the ratio is such that 1 to 15 cubic meters of gas are consumed per liter of liquid material.

28. The spray drying system (400) according to claim 27, wherein 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.

29. The spray drying system (400) further comprises a drying system (400) comprising a blower line (410), a heater (420), a first fan (430), and a second filter (440), wherein one end of the blower line (410) is connected to the second filter (440) and the other end is in communication with the drying cavity (50), and the first fan (430) and the heater (420) are installed in the blower line (410), as described in claim 28.

30. The spray drying system (400) according to claim 29, wherein a third filter (450) is further provided in the air supply line (410), and the third filter (450) is installed on the outlet side of the heater (420).

31. The spray drying system (400) according to claim 30, wherein the second filter (440) is a low-performance filter or a medium-performance filter, the third filter (450) is a high-performance filter, the low-performance filter can collect dust particles of 5 μm or larger, the medium-performance filter can collect dust particles of 1 μm to 5 μm, and the high-performance filter can collect dust particles of 0.5 μm or larger.

32. A control method for use in a spray drying system (400) according to claim 23, comprising: closing a first control valve (1) and opening a second control valve (2) after the spray drying device (100) has completed drying and granulation of a liquid material, thereby causing a transport pump to transport water from a water storage device (230) through a material supply line (210) to the liquid material passage (16) of a sprayer (10), and closing the transport pump after a predetermined time has elapsed.

33. A method for controlling a spray drying system (400) according to claim 32, further comprising opening a third control valve (3) after closing the transport pump, thereby allowing gas from a second gas supply line (320) to enter the liquid material passage (16) of the sprayer (10).

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