Hot air distribution device and spray drying tower and their applications

Abstract

The present invention proposes a hot air distribution device and a spray drying tower and their applications. In the hot air distribution device, the corresponding positions of the first spoiler, the second spoiler, the uniform distribution plate, and the distribution plate, which are sequentially arranged along a first specified direction, are respectively provided with at least one through hole for allowing the atomizing sleeve of the atomizer to pass through; the spoiler blades of the first spoiler and the second spoiler are arranged perpendicularly and staggered to each other in the projections perpendicular to the first specified direction; the uniform distribution plate includes a first dense opening area and a first sparse opening area, both of which have first vertical through holes; the distribution plate includes a second dense opening area with inclined through holes and a second sparse opening area with second vertical through holes, and the opening direction of the inclined through holes is toward the center line of the through holes. In order to achieve both uniformity of airflow and concentrated distribution of airflow, the inclined through holes are provided on the distribution plate, which greatly improves the drying rate of droplets, reduces the phenomenon of material particles sticking to the wall, and improves the yield of the final product.

Description

Technical Field

[0001] The invention relates to a hot air distribution device applied to a spray drying tower, a hot air distribution device, a spray drying tower and applications thereof. Background Art

[0002] A spray drying tower is a device that continuously granulates materials through spray drying. An atomizer installed within the tower disperses the liquid feed into fine droplets, which are then dried with a hot air flow to produce the final product. Spray drying towers offer high throughput, simple construction, and low cost, making them widely used in the ceramics, pharmaceutical, food, and chemical industries. The flow field distribution and airflow uniformity within the drying tower significantly impact the drying performance, a common challenge faced by the drying industry across diverse sectors.

[0003] Conventional spray drying towers typically use a traditional hot air distributor located at the air inlet to control airflow distribution within the tower. Currently, some large, traditional industrial spray drying towers, due to their earlier construction, have poorly designed hot air distributors, or even no hot air distributors at all.

[0004] With technological advancements, technicians have discovered that using distribution plates to adjust airflow uniformity and change the direction of localized airflow offers advantages such as greater flexibility, easier control of effects, and easier implementation. Consequently, in actual industrial production, some spray drying towers are using distribution plates instead of traditional hot air distributors to flexibly optimize hot air distribution within the drying tower.

[0005] Regarding the issue of uniform flow distribution within the drying tower, technicians initially believed that rotating hot air could prolong the drying process and increase residence time. However, further research revealed that in the spray drying process, especially pressure spray drying, reducing gas swirl and maintaining a vertical downward distribution of airflow within the drying tower, thereby maintaining a uniform flow distribution within the drying tower, are the keys to ensuring stable product quality. At the same time, regarding the issue of semi-wet material sticking to the tower wall, technicians initially believed that increasing the degree of gas swirl near the tower wall and reducing the semi-wet material's contact with the tower wall would reduce wall sticking. However, further research revealed that concentrating the hot air flow distribution and shortening the drying time can improve drying efficiency and reduce wall sticking. Summary of the Invention

[0006] The inventors of the present invention have discovered that the traditional hot air distributors used in the prior art have certain limitations in regulating the hot air flow due to the limitations of their structure. After the air flow enters the spray drying tower, it is easy to form a vortex or there is uneven distribution, resulting in low drying efficiency of the spray drying tower and the inability to effectively solve the problem of material sticking to the wall. In the pressure-type spray drying tower using a distribution plate in the prior art, since the distribution plate is difficult to take into account both the uniformity and concentration of the air flow, it is also easy to cause problems such as material sticking to the wall and low product yield. Therefore, how to achieve uniformity in the distribution of hot air flow and concentrated distribution of hot air flow is a technical problem that needs to be solved urgently. In view of the above problems, it is necessary for the embodiment of the present invention to propose a hot air distribution device and a spray drying tower to solve or partially solve the above problems. The technical solutions proposed by the present invention are as follows:

[0007] As a first aspect of an embodiment of the present invention, an embodiment of the present invention provides a hot air distribution device, which is applied to a spray drying tower provided with at least one atomizer, comprising a first spoiler, a second spoiler, a uniform distribution plate, and a distribution plate arranged in sequence along a first specified direction;

[0008] At least one through hole is provided at corresponding positions of the first spoiler, the second spoiler, the uniform distribution plate and the distribution plate, respectively, to allow the atomizing sleeve of the atomizer to pass through;

[0009] The projections of the spoiler blades of the first spoiler and the second spoiler perpendicular to the first designated direction are arranged perpendicularly and staggered to each other;

[0010] The uniformly distributed plate includes a first dense opening area arranged around the through hole position thereof and a first sparse opening area arranged on the periphery of the first dense opening area, and the openings of the first dense opening area and the first sparse opening area are both first vertical through holes;

[0011] The distribution plate includes a second dense opening area arranged around the position of its through holes and a second sparse opening area arranged on the periphery of the second dense opening area. The openings in the second dense opening area are inclined through holes, and the opening directions of the inclined through holes are toward the center line of the through holes. The openings in the second sparse opening area are second vertical through holes.

[0012] In one or some optional embodiments, the inclined through hole opening angle α is , wherein θ is the atomization angle of the atomizer.

[0013] In one or some optional embodiments, more preferably, the inclined through hole opening angle α is

[0014] In one or some optional embodiments, the porosity of the uniform distribution plate is 1-50%, the porosity of the distribution plate is 1-30%, and the porosity of the uniform distribution plate is greater than that of the distribution plate.

[0015] In one or some optional embodiments, more preferably, the opening rate of the uniform distribution plate is 1-40%, and the opening rate of the distribution plate is in the range of 1-20%.

[0016] In one or some optional embodiments, the area ratio of the first dense open area to the first sparse open area is 1 to 10; the area ratio of the second dense open area to the second sparse open area is 1 to 10.

[0017] In one or some optional embodiments, more preferably, the area ratio of the first dense opening area to the first sparse opening area is 1 to 8; the area ratio of the second dense opening area to the second sparse opening area is 1 to 8.

[0018] In one or some optional embodiments, the uniform distribution plate is configured to be suitable for the air flowing through the first vertical through hole at a speed of 0.1-1m / s, and the distribution plate is configured to be suitable for the air flowing through the second vertical through hole and the inclined through hole at a speed of 1-20m / s.

[0019] In one or some optional embodiments, the uniform distribution plate is configured to be suitable for the air flowing through the first vertical through hole at a speed of 0.1-0.8 m / s, and the distribution plate is configured to be suitable for the air flowing through the second vertical through hole and the inclined through hole at a speed of 1-15 m / s.

[0020] In one or some optional embodiments, the first vertical through holes in the first dense opening area and the first sparse opening area, and the inclined through holes in the second dense opening area and the second vertical through holes in the second sparse opening area are evenly arranged openings.

[0021] In one or some optional embodiments, the opening shapes of the first vertical through hole, the second vertical through hole and the inclined through hole are one or more of circular, elliptical, trapezoidal or concentric arcs.

[0022] In one or some optional embodiments, the first vertical through hole, the second vertical through hole and the inclined through hole are opened in one or more of the following ways: equal diameters at the top and bottom, larger diameters at the top and smaller diameters at the bottom, or smaller diameters at the top and larger diameters at the bottom.

[0023] In one or some optional embodiments, the hot air distribution device further includes a uniform distribution plate support seat and a distribution plate support seat;

[0024] The uniform distribution plate support is suitable for being fixed to the atomizing sleeve of the atomizer to connect the uniform distribution plate to the atomizing sleeve of the atomizer;

[0025] The distribution plate support seat is suitable for being fixed to the atomizing sleeve of the atomizer to connect the distribution plate with the atomizing sleeve of the atomizer.

[0026] In one or some optional embodiments, the uniform distribution plate support seat is cylindrical or prismatic in shape; the distribution plate support seat is in a shape with a reduced diameter along the first specified direction.

[0027] In one or some optional embodiments, the angle between the outer wall of the distribution plate support seat and the spray sleeve of the atomizer is 90°-α.

[0028] In one or some optional embodiments, the spacing between the spoiler blades of the first spoiler is greater than the spacing between the spoiler blades of the second spoiler.

[0029] In one or some optional embodiments, the height of the first spoiler is greater than the height of the second spoiler.

[0030] In one or some optional embodiments, the spacing between the spoiler blades of the first spoiler is 200-600 mm, the height of the first spoiler is 2-30 mm, the spacing between the spoiler blades of the second spoiler is 100-300 mm, and the height of the second spoiler is 1-15 mm.

[0031] In one or some optional embodiments, the spoiler blades of the first spoiler and the second spoiler are in the shape of one or more of a rectangle, a square or a diamond.

[0032] In one or some optional embodiments, the second spoiler is respectively connected to the first spoiler and the uniform distribution plate, and the first spoiler, the second spoiler, the uniform distribution plate and the distribution plate are all suitable for being connected to the inner wall of the tower body of the spray drying tower.

[0033] As a second aspect of an embodiment of the present invention, an embodiment of the present invention provides an application of a hot air distribution device in a spray drying tower.

[0034] As a first aspect of an embodiment of the present invention, the embodiment of the present invention provides a spray drying tower, characterized in that it includes at least one atomizer and the above-mentioned hot air distribution device.

[0035] In one or some optional embodiments, the spray drying tower further comprises a tower body;

[0036] An air inlet is provided on the upper portion of the tower body, the atomizer is provided above the tower body, and the hot air distribution device is provided in the area between the air inlet and the atomizing nozzle of the atomizer;

[0037] or,

[0038] An air inlet is provided at the lower part of the tower body, the atomizer is provided below the tower body, and the hot air distribution device is provided in the area between the air inlet and the atomizing nozzle of the atomizer.

[0039] Based on the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0040] The hot air distribution device provided by the embodiment of the present invention can be applied to a spray drying tower. By sequentially arranging a first spoiler, a second spoiler, a uniform distribution plate and a distribution plate, when the hot air flow enters the tower body from the air inlet of the spray drying tower, it first contacts with the first spoiler and the second spoiler in sequence, and the direction of the air flow movement is disturbed by the first spoiler and the second spoiler. Then, the evenly distributed hot air flow contacts with the uniform distribution plate. When the hot air flow passes through the uniform distribution plate, the hot air flow is kept moving in a vertical direction through the first vertical through hole on the uniform distribution plate. At the same time, the hot air flow passing through the distribution plate contacts with the distribution plate. When the hot air flow passes through the distribution plate, the openings in the second dense opening area are inclined. Through holes, so that the hot air flow close to the atomizer contacts the droplet group dispersed by the atomizer at a certain inclination angle, thereby enhancing the impact drying effect; and through the second vertical through holes in the second sparse opening area, the hot air flow away from the atomizer maintains vertical movement, maintaining a relatively uniform air flow distribution in the tower body, thereby avoiding material sticking to the wall; at the same time, since the first dense opening area of the uniformly distributed plate has more openings and a denser distribution of openings than the first sparse opening area, and the second dense opening area of the distribution plate has more openings and a denser distribution of openings than the second sparse opening area, it can be ensured that the hot air flow passing through the first spoiler and the second spoiler is concentratedly distributed around the atomizer.

[0041] The hot air distribution device provided by the embodiment of the present invention can achieve both air flow uniformity and concentrated air flow distribution. The first spoiler and the second spoiler disturb the air flow to form a large number of vortices and swirls, thereby improving the uniformity of hot air distribution in the tower, making the hot air flow evenly pass through the vertical through holes on the uniform distribution plate and the distribution plate, reducing gas swirl and keeping the hot air flow inside the drying tower vertically downwardly distributed, keeping the flow field inside the drying tower uniformly distributed, avoiding the overall deviation of the hot air flow inside the tower body, and ensuring stable product quality; by setting different opening areas of the uniform distribution plate and the distribution plate, and setting inclined through holes on the distribution plate, the hot air flow is concentratedly distributed around the atomizer, so that the droplet group immediately contacts a large amount of hot air flow after atomization by the atomizer, greatly improving the drying rate of the droplets, shortening the drying time of the droplets in the constant speed drying section, accelerating the evaporation rate of water on the droplet surface and quickly forming a drying shell layer, thereby completing the drying process before the material particles contact the tower wall, reducing the phenomenon of material particles sticking to the wall, and improving the final product yield.

[0042] In the embodiment of the present invention, the hot air distribution direction inside the spray drying tower is adjusted so that the hot air flow is evenly and centrally distributed around the atomizer. When the hot air flow contacts the distribution plate, the hot air flow centrally distributed around the atomizer contacts the droplet group dispersed by the atomizer at an angle α, so that the atomized droplet group immediately contacts the large amount of hot air flow distributed at the angle α, further accelerating the evaporation rate of water on the droplet surface and quickly forming a drying shell layer, avoiding mutual adhesion between material particles, and completing the drying process before the material particles contact the tower wall, which is beneficial to further reduce the phenomenon of material particles sticking to the wall.

[0043] When the hot air distribution device provided in the embodiment of the present invention is applied to a spray drying tower, the movement speed of the hot air flow through the uniform distribution plate and the openings of the distribution plate can be adjusted by adjusting the flow rate of the hot air flow at the air inlet of the spray drying tower. By adjusting the movement speed of the hot air inside the spray drying tower, the hot air flow passes through the distribution plate at a preset movement speed, which greatly improves the drying rate of the droplets, shortens the drying time of the droplets in the constant speed drying section, accelerates the droplet drying process, and further reduces the phenomenon of material particles adhering to the tower wall.

[0044] The hot air distribution device provided in an embodiment of the present invention, by setting the reduction angle of the distribution plate support seat to be the same as the opening direction α of the inclined through hole, that is, the inclination direction of the distribution plate support seat is consistent with the movement direction of the hot air flow, thereby avoiding the formation of vortices under the support seat and affecting the drying efficiency of the spray drying tower.

[0045] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purposes and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 A schematic structural diagram of a hot air distribution device provided in an embodiment of the present invention;

[0049] Figure 2 Schematic diagram of the structure of the spray drying tower provided in the embodiment of the present invention Figure 1 ;

[0050] Figure 3 Schematic diagram of the structure of the spray drying tower provided in the embodiment of the present invention Figure 2 ;

[0051] Figure 4 A schematic diagram of the opening angles of the inclined through holes on the distribution plate provided by an embodiment of the present invention;

[0052] Figure 5 Schematic diagram of the atomizing nozzle center line and atomizing angle of the atomizer described in the present invention.

[0053] in:

[0054] 1. Hot air distribution device; 101. First spoiler; 102. Second spoiler; 103. Uniform distribution plate; 1031. First sparse open hole area; 1032. First dense open hole area; 1033. First vertical through hole; 104. Distribution plate; 1041. Second sparse open hole area; 1042. Second dense open hole area; 1043. Second vertical through hole; 1044. Inclined through hole; 105. Uniform distribution plate support; 106. Distribution plate support; 2. Atomizer; 201. Atomizing nozzle; 202. Nozzle; 203. Center line of atomizing nozzle; 204. Atomizing sleeve; 3. Tower body; 301. Straight cylinder section; 302 Conical section; 4. Air inlet; 5. Air outlet channel; 501. Hot air outlet; 6. Discharge port. DETAILED DESCRIPTION

[0055] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0056] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0057] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0059] The embodiment of the present invention provides a hot air distribution device, which is applied to a spray drying tower provided with at least one atomizer, Figure 1 As shown, it includes a first spoiler 101, a second spoiler 102, a uniform distribution plate 103 and a distribution plate 104 arranged in sequence along a first specified direction;

[0060] At least one through hole is provided at corresponding positions of the first spoiler 101, the second spoiler 102, the uniform distribution plate 103 and the distribution plate 104, allowing the atomizing sleeve 204 of the atomizer 2 to pass through;

[0061] The projections of the spoiler blades of the first spoiler 101 and the second spoiler 102 perpendicular to the first designated direction are arranged perpendicularly and staggered to each other;

[0062] The uniformly distributed plate 103 includes a first dense opening area 1032 arranged around the through hole position thereof and a first sparse opening area 1031 arranged outside the first dense opening area 1032. The openings of the first dense opening area 1032 and the first sparse opening area 1031 are both first vertical through holes 1033.

[0063] The distribution plate 104 includes a second dense opening area 1042 arranged around the position of its through hole and a second sparse opening area 1041 arranged on the periphery of the second dense opening area 1042. The openings of the second dense opening area 1042 are inclined through holes 1044, and the opening direction of the inclined through holes 1044 is toward the center line of the through hole. The openings of the second sparse opening area 1041 are second vertical through holes 1043.

[0064] In the embodiment of the present invention, when the hot air distribution device is used in a spray drying tower, the position of the hot air distribution device 1 in the spray drying tower can be reasonably arranged according to the positions of the air inlet 4 and the atomizer 2 in the spray drying tower. Figure 1 and Figure 2 or Figure 3 As shown, the hot air distribution device 1 provided in the embodiment of the present invention can be arranged between the air inlet 4 and the atomizer 2 of the spray drying tower. For example, when the air inlet 4 is arranged at the upper part of the spray drying tower, and the atomizer 2 is arranged above the tower body 3, that is, the atomizing nozzle 201 of the atomizer 2 is located at the upper part of the tower body 3, since the hot air and the spray droplets flow downward and parallel, the hot air distribution device 1 can be arranged at the upper part of the drying tower, in the area between the air inlet 4 and the atomizing nozzle 201 of the atomizer 2, that is, the hot air distribution device 1 is located below the air inlet 4 and above the atomizing nozzle 201 of the atomizer 2. Figure 1 or Figure 2 As shown, the spray drying tower also includes a tower body 3, an air inlet 4, an air outlet channel 5 and a discharge port 6, wherein the atomizer 2 is inserted from the atomizing sleeve 204, and the hot air distribution device 1 is located in the area between the air inlet 4 and the atomizing nozzle 201 of the atomizer 2. The tower body 3 includes a straight cylinder section 301 and a conical section 302, and the air outlet channel 5 is provided with a hot air outlet 501.

[0065] Of course, in an embodiment of the present invention, if the air inlet 4 of the spray dryer is arranged at the lower part of the spray drying tower, and the atomizer 2 is arranged below the tower body 3, that is, the atomizing nozzle 201 of the atomizer 2 is located at the lower part of the tower body 3, since the hot air and the spray droplets flow upward in parallel, the hot air distribution device 1 can be arranged at the lower part of the drying tower, in the area between the air inlet 4 and the atomizing nozzle 201 of the atomizer 2, that is, the hot air distribution device 1 is located above the air inlet 4 and below the atomizing nozzle 201 of the atomizer 2.

[0066] In an embodiment of the present invention, the above-mentioned first designated direction can be determined according to the arrangement position of the atomizer 2 and the air inlet 4 in the spray drying tower when the hot air distribution device is installed in the spray drying tower. If the atomizer 2 and the air inlet 4 are arranged at the upper part of the tower body 3 of the spray drying tower, the first designated direction can be a vertical downward direction. If the atomizer 2 and the air inlet 4 are arranged at the lower part of the tower body 3 of the spray drying tower, the first designated direction can be a vertical upward direction.

[0067] The specific implementation of the spray drying tower provided in the embodiments of the present invention can be referred to the detailed description of the hot air distribution device 1 in the above embodiments, and any repetitive details will be omitted. The specific structure and implementation of the tower body 3, air inlet 4, air outlet duct 5, discharge port 6, and atomizer 2 in the above-mentioned spray drying tower can also be referred to by those skilled in the art for detailed descriptions thereof, and are not specifically limited in the embodiments of the present invention.

[0068] The first dense opening area 1032 and the first sparse opening area 1031 are corresponding concepts, wherein the dense opening area refers to an opening area with many openings per unit area and a dense distribution of openings, and the sparse opening area refers to an opening area with few openings per unit area and a sparse distribution of openings. The second dense opening area 1042 and the second sparse opening area 1041 are also corresponding concepts, and the difference in openings between the two is similar to that between the first dense opening area 1032 and the first sparse opening area 1031. In the first vertical through hole 1033 or the second vertical through hole 1043, the vertical through hole refers to an opening whose opening direction is perpendicular to the plate surface, that is, the central axis of the first vertical through hole 1033 is perpendicular to the uniformly distributed plate 103, and the central axis of the second vertical through hole 1043 is perpendicular to the distribution plate 104.

[0069] In the embodiment of the present invention, when the hot air distribution device is arranged in the spray drying tower, the center line of the through hole of the first spoiler 101, the second spoiler 102, the uniform distribution plate 103 and the distribution plate 104 coincides with the center line of the spray hole 202 of the atomizer 2. Figure 5 As shown, a spray hole 202 is provided at the center of the atomizer 2 of the spray drying tower, and the geometric center line of the spray hole 202 is the atomizing spray hole center line 203.

[0070] In the embodiment of the present invention, the spoiler blades of the first spoiler 101 and the second spoiler 102 are in the shape of one or more of a rectangle, a square or a diamond.

[0071] In the embodiment of the present invention, the opening shapes of the first vertical through hole 1033, the second vertical through hole 1043, and the inclined through hole 1044 can be one or more of a circle, an ellipse, a trapezoid, or concentric arcs. Of course, the opening shapes of the first vertical through hole 1033, the second vertical through hole 1043, and the inclined through hole 1044 provided in the embodiment of the present invention can also be other shapes described in the prior art. Those skilled in the art can refer to the detailed descriptions in the prior art for the specific implementation of other shapes, and in this regard, the embodiment of the present invention does not impose any specific limitations.

[0072] In the embodiment of the present invention, the first vertical through hole 1033, the second vertical through hole 1043, and the inclined through hole 1044 are formed in one or more of the following ways: equal diameters at the top and bottom, larger diameters at the top and smaller diameters at the bottom, or smaller diameters at the top and larger diameters at the bottom. Of course, the first vertical through hole 1033, the second vertical through hole 1043, and the inclined through hole 1044 provided in the embodiment of the present invention may also be formed in other ways described in the prior art. For the specific implementation of other ways, those skilled in the art may refer to the detailed descriptions in the prior art, and in this regard, no specific limitation is imposed in the embodiment of the present invention.

[0073] In the embodiment of the present invention, the second spoiler 102 is respectively connected to the first spoiler 101 and the uniform plate 103, and the first spoiler 101, the second spoiler 102, the uniform plate 103 and the distribution plate 104 are all suitable for being connected to the inner wall of the tower body 3 of the spray drying tower. In the embodiment of the present invention, the specific implementation method of the second spoiler 102 being connected to the first spoiler 101 and the uniform plate 103, as well as the specific implementation method of the first spoiler 101, the second spoiler 102, the uniform plate 103 and the distribution plate 104 being connected to the inner wall of the tower body 3 of the spray drying tower, can also refer to the detailed description in the prior art, and in this embodiment, no specific limitation is made to this.

[0074] In the embodiment of the present invention, the corresponding positions of the first spoiler 101, the second spoiler 102, the uniform distribution plate 103 and the distribution plate 104 of the hot air distribution device can be respectively provided with one through hole or multiple through holes to adapt to the specific structure of the spray drying tower. Figure 1 and Figure 2 As shown, when the spray drying tower is provided with an atomizer 2, the corresponding positions of the first spoiler 101, the second spoiler 102, the uniform distribution plate 103 and the distribution plate 104 are respectively provided with a through hole allowing the atomizing sleeve 204 of the atomizer 2 to pass through; Figure 1 and Figure 3 As shown, when the spray drying tower is provided with a plurality of atomizers 2, the corresponding positions of the first spoiler 101, the second spoiler 102, the uniform distribution plate 103 and the distribution plate 104 are respectively provided with a corresponding number of through holes allowing the atomizing sleeve 204 of the atomizer 2 to pass through. Moreover, when a plurality of atomizers 2 are provided in the spray drying tower, in the embodiment of the present invention, the uniform distribution plate 103 and the distribution plate 104 are respectively provided with a corresponding number of first dense opening areas 1032 and a plurality of second dense opening areas 1042 around the atomizing sleeve 204 of each atomizer 2, and the first sparse opening area 1031 is provided at the peripheral portion of the plurality of first dense opening areas 1032 of the uniform distribution plate 103, and the second sparse opening area 1041 is provided at the peripheral portion of the plurality of second dense opening areas 1042 of the distribution plate 104.

[0075] The hot air distribution device 1 provided by the embodiment of the present invention is arranged in a spray drying tower. When the first spoiler 101, the second spoiler 102, the uniform plate 103 and the distribution plate 104 are connected to the inner wall of the tower body 3, and the spray sleeve of the atomizer 2 passes through the through holes on the first spoiler 101, the second spoiler 102, the uniform plate 103 and the distribution plate 104 in sequence. During the spray forming process, the hot air flow enters the tower body 3 from the air inlet 4 of the spray drying tower, first contacts with the first spoiler 101 and the second spoiler 102 in sequence, and the spoiler blades of the first spoiler 101 and the second spoiler 102 are vertically staggered to form a grid structure, so as to better play the spoiler effect. The first spoiler 101 and the second spoiler 102 disturb the direction of air flow movement to form a large number of eddies and swirls, thereby improving the uniformity of hot air distribution in the tower and avoiding the overall bias flow phenomenon of hot air flow inside the tower body 3. Then, the evenly distributed hot air flow contacts the uniform distribution plate 103. When the hot air flow passes through the uniform distribution plate 103, it passes through the first vertical through hole 1033 on the uniform distribution plate 103, so that the hot air flow keeps moving in the vertical direction. Since the first dense opening area 1032 of the uniform distribution plate 103 has more openings than the first sparse opening area 1031 and the openings are densely distributed, the hot air flow near the atomizer 2 sleeve is more likely to pass through the uniform distribution plate 103, so that the hot air flow is concentrated around the atomizer 2 sleeve. Then, the hot air flow passing through the distribution plate 104 contacts the distribution plate 104. When the hot air flow passes through the distribution plate 104, due to the second dense opening of the distribution plate 104, the hot air flow is concentrated around the atomizer 2 sleeve. Zone 1042 has more openings than the second sparse opening zone 1041 and the openings are densely distributed, which can further ensure that the hot air flow is concentrated around the atomizer 2. Since the openings of the second dense opening zone 1042 are inclined through holes 1044, the hot air flow close to the atomizer 2 contacts the droplet group dispersed by the atomizer 2 at a certain inclination angle, thereby enhancing the impact drying effect and quickly completing the droplet drying; and the second vertical through hole 1043 of the second sparse opening zone 1041, so the hot air flow passing through the second vertical through hole 1043 always keeps moving in the vertical direction to maintain a relatively uniform air flow distribution in the tower body 3, thereby avoiding material sticking to the wall.

[0076] In one embodiment, referring to Figure 4 The opening angle α of the inclined through hole 1044 is Wherein, θ is the atomization angle of the atomizer 2 .

[0077] Reference Figure 5As shown, when the atomizer 2 atomizes the liquid to be atomized, the pressure causes the atomized droplets to be ejected from the atomizing nozzle 201 through the atomizing channel. The atomized droplets are dispersed in all directions from the nozzle orifice 202 to form a conical droplet group. The atomizing nozzle 201 can be pre-configured to control the maximum opening angle of the conical droplet group, which is the atomization angle of the atomizer 2. This atomization angle can be marked as θ. The magnitude of the atomization angle θ in the embodiment of the present invention can be set by those skilled in the art according to actual production needs, and is not specifically limited in the embodiment of the present invention.

[0078] In the embodiment of the present invention, referring to Figure 4 As shown, the opening angle α of the inclined through hole 1044 can be understood as the angle formed by the opening direction of the inclined through hole 1044 of the distribution plate 104 and the plane where the distribution plate 104 is located. Specifically, it can be the angle between the center line of the inclined through hole 1044 and the plane where the distribution plate 104 is located. In the embodiment of the present invention, the hot air flow is evenly and centrally distributed around the atomizer 2 by adjusting the hot air distribution direction inside the spray drying tower. When the hot air flow contacts the distribution plate 104, the hot air flow centrally distributed around the atomizer 2 contacts the droplet group dispersed by the atomizer 2 at an angle α, so that the atomized droplet group immediately contacts the large amount of hot air flow distributed at the angle α, further accelerating the evaporation rate of the water on the droplet surface and quickly forming a drying shell layer, avoiding mutual adhesion between material particles, and completing the drying process before the material particles contact the tower wall, which is conducive to further reducing the phenomenon of material particles sticking to the wall.

[0079] In a specific embodiment, the opening angle α of the inclined through hole 1044 can be

[0080] In one embodiment, the porosity of the uniform distribution plate 103 is 1-50%, the porosity of the distribution plate 104 is 1-30%, and the porosity of the uniform distribution plate 103 is greater than that of the distribution plate 104 .

[0081] In an embodiment of the present invention, the porosity of the uniform distribution plate 103 is greater than the porosity of the distribution plate 104. When the hot air flow passes through the uniform distribution plate 103 and the distribution plate 104, the opening area of the uniform distribution plate 103 is large, while the opening area of the uniform distribution plate 103 becomes smaller, so that the movement speed of the hot air flow through the uniform distribution plate 103 is lower than the movement speed of the hot air flow through the distribution plate 104, so that the hot air flow can contact the droplet group dispersed by the atomizer 2 at a higher speed, thereby enhancing the impact drying effect and accelerating the droplet drying speed.

[0082] In a specific embodiment, the above-mentioned uniform distribution plate 103 is configured to be suitable for the air to flow through the first vertical through hole 1033 at a speed of 0.1-1m / s, and the distribution plate 104 is configured to be suitable for the air to flow through the second vertical through hole 1043 and the inclined through hole 1044 at a speed of 1-20m / s. When the hot air distribution device 1 provided in the embodiment of the present invention is applied to a spray drying tower, those skilled in the art can adjust the speed of the hot air flow through the openings of the uniform distribution plate 103 and the distribution plate 104 by adjusting the hot air flow rate of the air inlet 4 of the spray drying tower. By adjusting the hot air movement speed inside the spray drying tower, the hot air flow passes through the distribution plate 104 at a speed of 1-20m / s, which greatly improves the drying rate of the droplets, shortens the drying time of the droplets in the constant speed drying section, speeds up the droplet drying process, and further reduces the phenomenon of material particles adhering to the tower wall. In the embodiment of the present invention, the method for adjusting the speed of the hot air flow through the uniform distribution plate 103 and the distribution plate 104 can refer to the detailed description in the prior art. In the embodiment of the present invention, no specific limitation is made to this.

[0083] As a specific implementation of an embodiment of the present invention, the uniform distribution plate 103 can be set to be suitable for the air flowing through the first vertical through hole 1033 to have a movement speed of 0.1-0.8 m / s, and the distribution plate 104 can be set to be suitable for the air flowing through the second vertical through hole 1043 and the inclined through hole 1044 to have a movement speed of 1-15 m / s.

[0084] In a specific embodiment, the opening rate of the uniform distribution plate 103 is 1-40%, and the opening rate of the distribution plate 104 is in the range of 1-20%.

[0085] In a specific embodiment, the area ratio of the first dense opening area 1032 to the first sparse opening area 1031 is 1 to 10; the area ratio of the second dense opening area 1042 to the second sparse opening area 1041 is 1 to 10.

[0086] In the embodiment of the present invention, by setting the area ratio of the first dense opening area 1032 to the first sparse opening area 1031, and the area ratio of the second dense opening area 1042 to the second sparse opening area 1041, the opening ratio setting of the dense opening area and the sparse opening area of the uniform distribution plate 103 and the distribution plate 104 is achieved, thereby adjusting the air flow rate of the hot air flow in the dense opening area and the sparse opening area, so that the hot air flow is concentrated around the atomizing sleeve 204 of the atomizer 2. Specifically, the area ratio of the first dense opening area 1032 to the first sparse opening area 1031 can be 1 to 8, and the area ratio of the second dense opening area 1042 to the second sparse opening area 1041 can be 1 to 8.

[0087] In a specific embodiment, the first vertical through holes 1033 of the first dense opening area 1032 and the first sparse opening area 1031 , as well as the inclined through holes 1044 of the second dense opening area 1042 and the second vertical through holes 1043 of the second sparse opening area 1041 are all evenly arranged openings. By evenly arranging the first vertical through holes 1033 in the first dense opening area 1032 and the first sparse opening area 1031, it is ensured that when the evenly distributed hot air flow passing through the first spoiler 101 and the second spoiler 102 contacts the uniformly distributed plate 103, the hot air flow in the first dense opening area 1032 and the first sparse opening area 1031 can still be evenly distributed in the corresponding area; at the same time, by evenly arranging the inclined through holes 1044 and the second vertical through holes 1043 in the second dense opening area 1042 and the second sparse opening area 1041, it is ensured that when the hot air flow passing through the uniformly distributed plate 103 contacts the distribution plate 104, the hot air flow in the second dense opening area 1042 and the second sparse opening area 1041 can also be evenly distributed in the corresponding area.

[0088] In one embodiment, referring to Figure 1 As shown, the hot air distribution device further includes a uniform distribution plate support seat 105 and a distribution plate support seat 106;

[0089] The uniform distribution plate support 105 is suitable for being fixed to the atomizing sleeve 204 of the atomizer 2 to connect the uniform distribution plate 103 with the atomizing sleeve 204 of the atomizer 2;

[0090] The distribution plate support 106 is suitable for being fixed to the atomizing sleeve 204 of the atomizer 2 to connect the distribution plate 104 to the atomizing sleeve 204 of the atomizer 2 .

[0091] In the embodiment of the present invention, the uniform distribution plate support 105 and the distribution plate support 106 are respectively fixed to the atomizing sleeve 204 of the atomizer 2, so that the uniform distribution plate 103 and the distribution plate 104 can be respectively connected to the atomizing sleeve 204 of the atomizer 2.

[0092] In one embodiment, referring to Figure 1 As shown, the uniform distribution plate support seat 105 is cylindrical or prismatic in shape; the distribution plate support seat 106 is in a shape with a reduced diameter along the first designated direction.

[0093] In one embodiment, referring to Figure 1 As shown, the angle between the outer wall of the distribution plate support 106 and the spray sleeve of the atomizer 2 is 90°-α. By setting the reduction angle of the distribution plate support 106 to be the same as the opening direction α of the inclined through hole 1044, that is, the inclination direction of the distribution plate support 106 is consistent with the direction of the hot air flow, the formation of vortices below the support can be avoided, which would affect the drying efficiency of the spray drying tower.

[0094] In one embodiment, referring to Figure 1 As shown, the spacing between the spoiler blades of the first spoiler 101 is greater than the spacing between the spoiler blades of the second spoiler 102. In the embodiment of the present invention, by setting the spacing between the spoiler blades of the first spoiler 101 to be greater than the spacing between the spoiler blades of the second spoiler 102, the spoiler blades of the second spoiler 102 are relatively denser, thereby evenly distributing the hot air passing through the second spoiler 102.

[0095] In one embodiment, referring to Figure 1 As shown, the height of the first spoiler 101 is greater than the height of the second spoiler 102. In the embodiment of the present invention, by setting the height of the first spoiler 101 to be greater than the height of the second spoiler 102, the airflow direction of the thermal airflow is changed, and the spoiler effect of the first spoiler 101 and the second spoiler 102 is better exerted.

[0096] In a specific embodiment, the spacing between the spoiler blades of the first spoiler 101 may be 200-600 mm, the height of the first spoiler 101 may be 2-30 mm, the spacing between the spoiler blades of the second spoiler 102 may be 100-300 mm, and the height of the second spoiler 102 may be 1-15 mm. In the embodiment of the present invention, the spacing between the spoiler blades of the first spoiler 101 and the second spoiler 102, as well as the height of the first spoiler 101 and the second spoiler 102, may be reasonably selected by those skilled in the art based on the corresponding spacing ranges and height ranges to meet actual production requirements.

[0097] In order to better illustrate the embodiments of the present invention, the following describes in detail several specific embodiments of atomization drying using an atomization drying tower of the hot air distribution device provided in the embodiments of the present invention and an atomization drying tower in the prior art to verify the beneficial effects of the hot air distribution device provided in the embodiments of the present invention:

[0098] To facilitate further understanding of the present invention, the following embodiment is described in detail with reference to the accompanying drawings, taking as an example a spray drying process in which the air inlet 4 is provided at the upper portion of the spray drying tower, the atomizer 2 is provided above the tower body 3, and the hot air distribution device 1 is located in the area between the air inlet 4 and the atomizing nozzle 201 of the atomizer 2.

[0099] In the spray drying tower, the atomizing nozzle 201 of the atomizer 2 is located at the upper part of the tower body 3. Since the hot air and the spray droplets flow downward in parallel, the hot air distribution device 1 is located below the air inlet 4 and above the atomizing nozzle 201 of the atomizer 2. Assume that, in the following specific embodiment, the spray drying tower used is a pressure-type spray drying tower with a tower diameter of 2 meters, and each pressure-type spray drying tower has 8 air inlets 4 evenly arranged on the annular air inlet duct. The spray drying tower is provided with an atomizer 2, which is vertically inserted into the tower body 3 from the center of the tower top through the atomizer 2 sleeve. Assume that the atomizing sleeve 204 of the atomizer 2 has an outer diameter of 80 mm, the atomizer 2 is located 250 mm below the air inlet 4, the nozzle 202 has a diameter of 1 mm, and the atomization angle is 60°. A spray drying experiment was conducted using 10 kg of kaolin slurry (35% solids content) at a spray drying inlet temperature of 550°C, an exhaust gas temperature of 180°C, and a pressure of 8 MPa. After the experiment, the spray drying process was observed for any sticking to the wall, and product performance was determined based on the test results. The product performance testing methods used in the following examples include particle size distribution testing and product yield calculation.

[0100] Among them, the product particle size distribution test method can use the Malvern 2000MU laser particle size analyzer to test the product particle size, and the adopted test standard can refer to GB / T-19077-2016; and the product yield calculation method is to calculate the product yield by calculating the percentage of the mass of the sample under the tower to the dry mass of the sample, that is, calculating: the mass of the sample under the tower / the dry mass of the sample × 100%, to obtain the product yield.

[0101] Comparative Example 1

[0102] The pressure-type spray drying tower provided in this embodiment was not equipped with the hot air distribution device 1. During the test, the eight air inlets 4 of the spray drying tower were opened in sequence, and the opening degree increased. The test phenomena, i.e., the product performance test results, are shown in Table 1.

[0103] Comparative Example 2

[0104] The pressure-type spray drying tower provided in this embodiment is not equipped with the hot air distribution device 1. During the test, all eight air inlets 4 of the spray drying tower are open. The test phenomena, i.e., the product performance test results, are shown in Table 1.

[0105] Comparative Example 3

[0106] The hot air distribution device 1 installed in the pressure spray drying tower provided in this embodiment includes a first spoiler 101, a second spoiler 102, and a uniform distribution plate 103, wherein the spoiler blade spacing of the first spoiler 101 is 200 mm, and the height of the first spoiler 101 is 20 mm; the spoiler blade spacing of the second spoiler 102 is 100 mm, and the height of the second spoiler 102 is 10 mm; the first spoiler 101 is connected to the second spoiler 102, and the second spoiler 102 is connected to the upper surface of the uniform distribution plate 103; the opening rate of the uniform distribution plate 103 is 30%, the opening aperture is 10 mm, and the installation position is 10 mm lower than the air inlet. The ratio of the area of the sparse opening area to the dense opening area of the uniform distribution plate 103 is 1:1. The uniform plate 103 is connected to the atomizing sleeve 204 of the atomizer 2 by a uniform plate support 105. The uniform plate support 105 is a hollow cylindrical shape with an outer diameter of 120 mm. During the test, the 8 air inlets 4 of the spray drying tower are all opened, and the hot air flow through the uniform plate 103 movement speed is set to 0.2 m / s. The test phenomenon, i.e., the product performance test results are shown in Table 1.

[0107] Comparative Example 4

[0108] The hot air distribution device 1 installed in the pressure spray drying tower provided in this embodiment includes a first spoiler 101, a second spoiler 102, and a uniform distribution plate 103, wherein the spoiler blade spacing of the first spoiler 101 is 400mm and the height of the first spoiler 101 is 5mm; the spoiler blade spacing of the second spoiler 102 is 250mm and the height of the second spoiler 102 is 2mm; the first spoiler 101 is connected to the second spoiler 102, and the second spoiler 102 is connected to the upper surface of the uniform distribution plate 103; the opening rate of the uniform distribution plate 103 is 20%, the opening aperture is 10mm, and the installation position is 10mm lower than the air inlet. The ratio of the area of the sparse opening area to the dense opening area of the uniform distribution plate 103 is 1:8. The uniform plate 103 is connected to the atomizing sleeve 204 of the atomizer 2 by a uniform plate support 105. The uniform plate support 105 is a hollow cylindrical shape with an outer diameter of 80 mm. During the test, the 8 air inlets 4 of the spray drying tower are all opened, and the hot air flow through the uniform plate 103 is set to a speed of 0.7 m / s. The test phenomenon, i.e., the product performance test results, are shown in Table 1.

[0109] Example 1

[0110] The hot air distribution device 1 installed in the pressure spray drying tower provided in this embodiment includes a first spoiler 101, a second spoiler 102, a uniform distribution plate 103, and a distribution plate 104. The spacing between the spoiler blades of the first spoiler 101 is 200 mm, and the height of the first spoiler 101 is 20 mm; the spacing between the spoiler blades of the second spoiler 102 is 100 mm, and the height of the second spoiler 102 is 10 mm; the first spoiler 101 is connected to the second spoiler 102, and the second spoiler 102 is connected to the upper surface of the uniform distribution plate 103; the uniform distribution plate 103 has an opening rate of 40%, an opening aperture of 10 mm, and is installed 10 mm below the air inlet. The area ratio of the sparse opening area to the dense opening area of the uniform distribution plate 103 is 1:5. The uniform distribution plate 103 is connected to the atomizing sleeve 204 of the atomizer 2 through the uniform distribution plate support seat 105. The uniform distribution plate support seat 105 is a hollow cylinder with an outer diameter of 120 mm; the installation position of the distribution plate 104 is 150 mm lower than the uniform distribution plate, the opening rate of the distribution plate 104 is 10%, the opening aperture is 10 mm, the area ratio of the sparse opening area to the dense opening area is 1:5, the opening angle α of the inclined through hole 1044 of the distribution plate 104 is 75°, and the distribution plate 104 is connected to the atomizing sleeve 204 of the atomizer 2 through the distribution plate support seat 106. The connection part of the distribution plate support seat 106 and the distribution plate 104 has an outer diameter of 120 mm, and the angle between the outer wall of the distribution plate support seat 106 and the spray sleeve of the atomizer 2 is 25°. During the test, all eight air inlets 4 of the spray drying tower were open, and the preset hot air flow speed through the uniform distribution plate 103 was 0.3 m / s, and the hot air flow speed through the distribution plate 104 was 3 m / s. The test phenomena, i.e., the product performance test results, are shown in Table 1.

[0111] Example 2

[0112] The hot air distribution device 1 installed in the pressure spray drying tower provided in this embodiment includes a first spoiler 101, a second spoiler 102, a uniform distribution plate 103, and a distribution plate 104. The pitch between the spoiler blades of the first spoiler 101 is 400 mm, and the height of the first spoiler 101 is 5 mm; the pitch between the spoiler blades of the second spoiler 102 is 250 mm, and the height of the second spoiler 102 is 2 mm; the first spoiler 101 is connected to the second spoiler 102, and the second spoiler 102 is connected to the upper surface of the uniform distribution plate 103; the uniform distribution plate 103 has an opening rate of 40%, an opening aperture of 10 mm, and is installed 10 mm below the air inlet. The area ratio of the sparse opening area to the dense opening area of the uniform distribution plate 103 is 1:8. The uniform distribution plate 103 is connected to the atomizing sleeve 204 of the atomizer 2 through the uniform distribution plate support seat 105. The uniform distribution plate support seat 105 is a hollow cylinder with an outer diameter of 120 mm; the installation position of the distribution plate 104 is 150 mm lower than the uniform distribution plate, the opening rate of the distribution plate 104 is 10%, the opening aperture is 10 mm, the area ratio of the sparse opening area to the dense opening area is 1:5, the opening angle α of the inclined through hole 1044 of the distribution plate 104 is 30°, and the distribution plate 104 is connected to the atomizing sleeve 204 of the atomizer 2 through the distribution plate support seat 106. The connection part of the distribution plate support seat 106 and the distribution plate 104 has an outer diameter of 120 mm, and the angle between the outer wall of the distribution plate support seat 106 and the spray sleeve of the atomizer 2 is 60°. During the test, all eight air inlets 4 of the spray drying tower were open, and the preset hot air flow speed through the uniform distribution plate 103 was 0.4 m / s, and the hot air flow speed through the distribution plate 104 was 4 m / s. The test phenomena, i.e., the product performance test results, are shown in Table 1.

[0113] Example 3:

[0114] The hot air distribution device 1 installed in the pressure spray drying tower provided in this embodiment includes a first spoiler 101, a second spoiler 102, a uniform distribution plate 103, and a distribution plate 104. The pitch between the spoiler blades of the first spoiler 101 is 250 mm, and the height of the first spoiler 101 is 10 mm; the pitch between the spoiler blades of the second spoiler 102 is 150 mm, and the height of the second spoiler 102 is 5 mm; the first spoiler 101 is connected to the second spoiler 102, and the second spoiler 102 is connected to the upper surface of the uniform distribution plate 103; the uniform distribution plate 103 has an opening rate of 40%, an opening aperture of 10 mm, and is installed 10 mm below the air inlet. The area ratio of the sparse opening area to the dense opening area of the uniform distribution plate 103 is 1:8. The uniform distribution plate 103 is connected to the atomizing sleeve 204 of the atomizer 2 through the uniform distribution plate support seat 105. The uniform distribution plate support seat 105 is a hollow cylinder with an outer diameter of 120 mm; the installation position of the distribution plate 104 is 150 mm lower than the uniform distribution plate. The opening rate of the distribution plate 104 is 15%, the opening aperture is 10 mm, the area ratio of the sparse opening area to the dense opening area is 1:5, the opening angle α of the inclined through hole 1044 of the distribution plate 104 is 60°, and the distribution plate 104 is connected to the atomizing sleeve 204 of the atomizer 2 through the distribution plate support seat 106. The connection part of the distribution plate support seat 106 and the distribution plate 104 has an outer diameter of 120 mm, and the angle between the outer wall of the distribution plate support seat 106 and the spray sleeve of the atomizer 2 is 30°. During the test, all eight air inlets 4 of the spray drying tower were open, and the preset hot air flow speed through the uniform distribution plate 103 was 0.5 m / s, and the hot air flow speed through the distribution plate 104 was 4 m / s. The test phenomena, i.e., the product performance test results, are shown in Table 1.

[0115] Example 4

[0116] The hot air distribution device 1 installed in the pressure spray drying tower provided in this embodiment includes a first spoiler 101, a second spoiler 102, a uniform distribution plate 103, and a distribution plate 104. The spacing between the spoiler blades of the first spoiler 101 is 500 mm, and the height of the first spoiler 101 is 10 mm; the spacing between the spoiler blades of the second spoiler 102 is 150 mm, and the height of the second spoiler 102 is 2 mm; the first spoiler 101 is connected to the second spoiler 102, and the second spoiler 102 is connected to the upper surface of the uniform distribution plate 103; the uniform distribution plate 103 has an opening rate of 30%, an opening aperture of 10 mm, and is installed 10 mm below the air inlet. The area ratio of the sparse opening area to the dense opening area of the uniform distribution plate 103 is 1:8. The uniform distribution plate 103 is connected to the atomizing sleeve 204 of the atomizer 2 through the uniform distribution plate support seat 105. The uniform distribution plate support seat 105 is a hollow cylinder with an outer diameter of 120 mm; the installation position of the distribution plate 104 is 150 mm lower than the uniform distribution plate, the opening rate of the distribution plate 104 is 20%, the opening aperture is 10 mm, the area ratio of the sparse opening area to the dense opening area is 1:8, the opening angle α of the inclined through hole 1044 of the distribution plate 104 is 30°, and the distribution plate 104 is connected to the atomizing sleeve 204 of the atomizer 2 through the distribution plate support seat 106. The connection part of the distribution plate support seat 106 and the distribution plate 104 has an outer diameter of 120 mm, and the angle between the outer wall of the distribution plate support seat 106 and the spray sleeve of the atomizer 2 is 60°. During the test, all eight air inlets 4 of the spray drying tower were open, and the preset hot air flow speed through the uniform distribution plate 103 was 0.7 m / s, and the hot air flow speed through the distribution plate 104 was 7 m / s. The test phenomena, i.e., the product performance test results, are shown in Table 1.

[0117] Example 5

[0118] The hot air distribution device 1 installed in the pressure spray drying tower provided in this embodiment includes a first spoiler 101, a second spoiler 102, a uniform distribution plate 103, and a distribution plate 104. The pitch between the spoiler blades of the first spoiler 101 is 400 mm, and the height of the first spoiler 101 is 5 mm; the pitch between the spoiler blades of the second spoiler 102 is 250 mm, and the height of the second spoiler 102 is 2 mm; the first spoiler 101 is connected to the second spoiler 102, and the second spoiler 102 is connected to the upper surface of the uniform distribution plate 103; the uniform distribution plate 103 has an opening rate of 20%, an opening aperture of 10 mm, and is installed 10 mm below the air inlet. The area ratio of the sparse opening area to the dense opening area of the uniform distribution plate 103 is 1:3. The uniform distribution plate 103 is connected to the atomizing sleeve 204 of the atomizer 2 through the uniform distribution plate support seat 105. The uniform distribution plate support seat 105 is a hollow cylinder with an outer diameter of 120 mm; the installation position of the distribution plate 104 is 150 mm lower than the uniform distribution plate, the opening rate of the distribution plate 104 is 20%, the opening aperture is 10 mm, the area ratio of the sparse opening area to the dense opening area is 1:3, the opening angle α of the inclined through hole 1044 of the distribution plate 104 is 45°, and the distribution plate 104 is connected to the atomizing sleeve 204 of the atomizer 2 through the distribution plate support seat 106. The connection part of the distribution plate support seat 106 and the distribution plate 104 has an outer diameter of 120 mm, and the angle between the outer wall of the distribution plate support seat 106 and the spray sleeve of the atomizer 2 is 45°. During the test, all eight air inlets 4 of the spray drying tower were open, and the preset hot air flow speed through the uniform distribution plate 103 was 0.7 m / s, and the hot air flow speed through the distribution plate 104 was 6 m / s. The test phenomena, i.e., the product performance test results, are shown in Table 1.

[0119] Example 6

[0120] The hot air distribution device 1 installed in the pressure spray drying tower provided in this embodiment includes a first spoiler 101, a second spoiler 102, a uniform distribution plate 103, and a distribution plate 104. The spacing between the spoiler blades of the first spoiler 101 is 250 mm, and the height of the first spoiler 101 is 10 mm; the spacing between the spoiler blades of the second spoiler 102 is 150 mm, and the height of the second spoiler 102 is 5 mm; the first spoiler 101 is connected to the second spoiler 102, and the second spoiler 102 is connected to the upper surface of the uniform distribution plate 103; the uniform distribution plate 103 has an opening rate of 20%, an opening aperture of 10 mm, and is installed 10 mm below the air inlet. The area ratio of the sparse opening area to the dense opening area of the uniform distribution plate 103 is 1:5. The uniform distribution plate 103 is connected to the atomizing sleeve 204 of the atomizer 2 through the uniform distribution plate support seat 105. The uniform distribution plate support seat 105 is a hollow cylinder with an outer diameter of 120 mm; the installation position of the distribution plate 104 is 150 mm lower than the uniform distribution plate, the opening rate of the distribution plate 104 is 10%, the opening aperture is 10 mm, the area ratio of the sparse opening area to the dense opening area is 1:3, the opening angle α of the inclined through hole 1044 of the distribution plate 104 is 75°, and the distribution plate 104 is connected to the atomizing sleeve 204 of the atomizer 2 through the distribution plate support seat 106. The connection part of the distribution plate support seat 106 and the distribution plate 104 has an outer diameter of 120 mm, and the angle between the outer wall of the distribution plate support seat 106 and the spray sleeve of the atomizer 2 is 25°. During the test, all eight air inlets 4 of the spray drying tower were open, and the preset hot air flow speed through the uniform distribution plate 103 was 0.8 m / s, and the hot air flow speed through the distribution plate 104 was 7 m / s. The test phenomena, i.e., the product performance test results, are shown in Table 1.

[0121] Table 1 is the performance test results of the spray forming test

[0122]

[0123]

[0124] The results in Table 1 show that, compared with the spray drying tower used in the comparative example, the spray drying tower using the hot air distribution device 1 provided in the embodiment of the present invention can solve the problem of material sticking to the wall, the product particle size distribution D50 is reduced to 60-70 μm, and the product yield (the yield of the sample under the tower) is increased from about 60% to more than 80%.

[0125] The hot air distribution device 1 provided in the embodiment of the present invention can achieve both uniformity of airflow and concentrated distribution of airflow. The first spoiler 101 and the second spoiler 102 disturb the airflow to form a large number of eddies and swirls, thereby improving the uniformity of hot air distribution in the tower. The hot air flow is evenly passed through the vertical through holes on the uniform distribution plate 103 and the distribution plate 104, reducing gas swirl and maintaining the vertical downward distribution of the hot air flow inside the drying tower. The flow field inside the drying tower is kept uniformly distributed, avoiding the overall deviation of the hot air flow inside the tower body 3, and ensuring stable product quality. By setting different opening areas of the uniform distribution plate 103 and the distribution plate 104, and setting an inclined through hole 1044 on the distribution plate 104, the hot air flow is concentratedly distributed around the atomizer 2, so that the droplet group immediately contacts a large amount of hot air flow after atomization by the atomizer 2, which greatly improves the drying rate of the droplets, shortens the drying time of the droplets in the constant-speed drying section, accelerates the evaporation rate of the water on the droplet surface and quickly forms a drying shell layer, thereby completing the drying process before the material particles contact the tower wall, reducing the phenomenon of material particles sticking to the wall, and improving the final product yield.

[0126] Based on the same inventive concept, an embodiment of the present invention further provides an application of a hot air distribution device in a spray drying tower.

[0127] The specific implementation of the hot air distribution device provided in the embodiment of the present invention in the spray drying tower can refer to the detailed description of the hot air distribution device 1 in the above embodiment, and the repeated parts will not be repeated. The specific structure and implementation of the above-mentioned spray drying tower can also be referred to by those skilled in the art. In this regard, no specific limitation is imposed in the embodiment of the present invention.

[0128] Based on the same inventive concept, an embodiment of the present invention further provides a spray drying tower, comprising at least one atomizer 2 and the above-mentioned hot air distribution device 1 .

[0129] In one embodiment, the spray drying tower further includes a tower body 3;

[0130] The tower body 3 is provided with an air inlet 4 on the upper part, the atomizer 2 is provided above the tower body 3, and the hot air distribution device 1 is provided in the area between the air inlet 4 and the atomizing nozzle 201 of the atomizer 2;

[0131] or,

[0132] An air inlet 4 is provided at the lower portion of the tower body 3 , the atomizer 2 is provided below the tower body 3 , and the hot air distribution device 1 is provided in the area between the air inlet 4 and the atomizing nozzle 201 of the atomizer 2 .

[0133] The specific implementation of the spray drying tower provided in the embodiments of the present invention can be referred to the detailed description of the hot air distribution device 1 in the above embodiments, and any repetitive details will be omitted. The specific structure and implementation of the tower body 3, air inlet 4, air outlet duct 5, discharge port 6, and atomizer 2 in the above-mentioned spray drying tower can also be referred to by those skilled in the art for detailed descriptions thereof, and are not specifically limited in the embodiments of the present invention.

[0134] In this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article or apparatus. The orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0135] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention is not limited to any single aspect, nor to any single embodiment, nor to any combination and / or permutation of these aspects and / or embodiments. Each aspect and / or embodiment of the present invention can be used alone or in combination with one or more other aspects and / or other embodiments.

[0136] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A hot air distribution device, applied to a spray drying tower provided with at least one atomizer, characterized in that: The hot air distribution device comprises a first spoiler, a second spoiler, a uniform distribution plate, and a distribution plate, which are sequentially arranged along a first designated direction; the first designated direction is determined according to the arrangement positions of the atomizer and the air inlet in the spray drying tower when the hot air distribution device is arranged in the spray drying tower. If the atomizer and the air inlet are arranged at the upper part of the tower body of the spray drying tower, the first designated direction is a vertically downward direction; if the atomizer and the air inlet are arranged at the lower part of the tower body of the spray drying tower, the first designated direction is a vertically upward direction; At least one through hole is provided at corresponding positions of the first spoiler, the second spoiler, the uniform distribution plate and the distribution plate, respectively, to allow the atomizing sleeve of the atomizer to pass through; The projections of the spoiler blades of the first spoiler and the second spoiler perpendicular to the first designated direction are arranged perpendicularly and staggered to each other; The uniformly distributed plate includes a first dense opening area arranged around the through hole position thereof and a first sparse opening area arranged on the periphery of the first dense opening area, and the openings of the first dense opening area and the first sparse opening area are both first vertical through holes; The distribution plate includes a second dense opening area arranged around the position of its through holes and a second sparse opening area arranged on the periphery of the second dense opening area. The openings in the second dense opening area are inclined through holes, and the opening directions of the inclined through holes are toward the center line of the through holes. The openings in the second sparse opening area are second vertical through holes.

2. The hot air distribution device according to claim 1, characterized in that The opening angle α of the inclined through hole is Wherein, θ is the atomization angle of the atomizer.

3. The hot air distribution device according to claim 2, characterized in that The opening angle α of the inclined through hole is 4. The hot air distribution device according to claim 1, characterized in that The opening rate of the uniform distribution plate is 1-50%, the opening rate of the distribution plate is in the range of 1-30%, and the opening rate of the uniform distribution plate is greater than that of the distribution plate.

5. The hot air distribution device according to claim 4, characterized in that: The opening rate of the uniform distribution plate is 1-40%, and the opening rate of the distribution plate is in the range of 1-20%.

6. The hot air distribution device according to claim 4, characterized in that The area ratio of the first dense open hole area to the first sparse open hole area is 1 to 10; the area ratio of the second dense open hole area to the second sparse open hole area is 1 to 10.

7. The hot air distribution device according to claim 6, characterized in that: The area ratio of the first dense open hole area to the first sparse open hole area is 1 to 8; the area ratio of the second dense open hole area to the second sparse open hole area is 1 to 8.

8. The hot air distribution device according to any one of claims 1 to 7, characterized in that: The first vertical through holes in the first dense opening area and the first sparse opening area, and the inclined through holes in the second dense opening area and the second vertical through holes in the second sparse opening area are evenly arranged openings.

9. The hot air distribution device according to any one of claims 1 to 7, characterized in that: The opening shapes of the first vertical through hole, the second vertical through hole and the inclined through hole are one or more of circular, elliptical, trapezoidal or concentric arcs.

10. The hot air distribution device according to any one of claims 1 to 7, characterized in that: The first vertical through hole, the second vertical through hole and the inclined through hole are opened in one or more of the following ways: the diameters are equal at the top and the bottom, the diameters are larger at the top and smaller at the bottom, or the diameters are smaller at the top and larger at the bottom.

11. The hot air distribution device according to any one of claims 2 to 7, characterized in that: It also includes a uniform distribution plate support seat and a distribution plate support seat; The uniform distribution plate support is suitable for being fixed to the atomizing sleeve of the atomizer to connect the uniform distribution plate to the atomizing sleeve of the atomizer; The distribution plate support seat is suitable for being fixed to the atomizing sleeve of the atomizer to connect the distribution plate with the atomizing sleeve of the atomizer.

12. The hot air distribution device according to claim 11, characterized in that: The uniform distribution plate support seat is in the shape of a cylinder or a prism; the distribution plate support seat has a shape with a reduced diameter along the first specified direction.

13. The hot air distribution device according to claim 11, characterized in that: The included angle between the outer wall of the distribution plate support seat and the spray sleeve of the atomizer is 90°-α.

14. The hot air distribution device according to any one of claims 1 to 7, characterized in that: The spacing between the spoiler blades of the first spoiler is greater than the spacing between the spoiler blades of the second spoiler.

15. The hot air distribution device according to claim 14, characterized in that: The height of the first spoiler is greater than the height of the second spoiler.

16. The hot air distribution device according to claim 15, characterized in that: The spacing between the spoiler blades of the first spoiler is 200-600 mm, and the height of the first spoiler is 2-30 mm. The spacing between the spoiler blades of the second spoiler is 100-300 mm, and the height of the second spoiler is 1-15 mm.

17. The hot air distribution device according to claim 14, characterized in that: The spoiler blades of the first spoiler and the second spoiler are in the shape of one or more of a rectangle, a square or a diamond.

18. The hot air distribution device according to any one of claims 1 to 7, characterized in that: The second spoiler is connected to the first spoiler and the uniform distribution plate respectively. The first spoiler, the second spoiler, the uniform distribution plate and the distribution plate are all suitable for being connected to the inner wall of the spray drying tower.

19. Use of the hot air distribution device according to any one of claims 1 to 18 in a spray drying tower.

20. A spray drying tower, characterized in that: The invention comprises at least one atomizer and the hot air distribution device according to any one of claims 1 to 18.

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