Hot air distributor and spray drying device

Abstract

The utility model discloses a hot air distributor and a spray drying device. The hot air distributor comprises an air inlet pipe and an air outlet pipe, wherein the air inlet pipe comprises an air inlet and an airflow channel communicated with the air inlet; the weir plate is arranged in the airflow channel and is perpendicular to the flowing direction of airflow in the airflow channel; and a gap between the weir plate and the inner wall surface of the airflow channel is 10-50mm. Materials can be prevented from being accumulated on the wall face of the drying chamber.

Description

Technical Field

[0001] The present application relates to the technical field of drying devices, and more specifically, to a hot air distributor and a spray drying device. Background Art

[0002] The hot air distributor is a device that allows the airflow entering the spray drying device from the air inlet pipe to enter the drying chamber evenly and in a certain direction, and can control the flow direction of the gas, liquid droplets and dried powder in the drying chamber. However, the hot air distributor in the prior art easily causes the material to accumulate on the wall of the drying chamber, resulting in poor drying effect of the material.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Utility Model Content

[0004] An object of the present application is to provide a new technical solution for a hot air distributor and a spray drying device.

[0005] To achieve the above object, according to a first aspect of the present application, a hot air distributor is provided, comprising:

[0006] An air inlet pipe, the air inlet pipe comprising an air inlet and an air flow channel communicating with the air inlet;

[0007] a weir plate, the weir plate being arranged in the air flow channel and being perpendicular to the air flow direction in the air flow channel;

[0008] Wherein, the gap between the weir plate and the inner wall surface of the air flow channel is 10 to 50 mm.

[0009] Optionally, the weir plate is provided with a plurality of ventilation holes, and the apertures of the ventilation holes range from 1 to 10 mm.

[0010] Optionally, the hot air distributor comprises a plurality of weir plates, and the plurality of weir plates are arranged at intervals along the air flow direction in the air flow channel;

[0011] Wherein, the apertures of the ventilation holes of the plurality of weir plates increase sequentially along the airflow flow direction in the airflow channel.

[0012] Optionally, the hot air distributor comprises a plurality of weir plates, and the plurality of weir plates are arranged at intervals along the air flow direction in the air flow channel;

[0013] Wherein, the hole density of the ventilation holes of the plurality of weir plates increases successively along the airflow flow direction in the airflow channel.

[0014] Optionally, the weir plate is formed by stacking at least two porous plates with different pore sizes;

[0015] Alternatively, the weir plate is formed by stacking at least two porous plates with different pore densities.

[0016] Optionally, the air inlet duct comprises a top plate, a bottom plate and a side plate, and the top plate, the bottom plate and the side plate together form the air inlet and the air flow channel;

[0017] The weir plate is connected to the bottom plate, and a first gap is formed between the weir plate and the top plate; or the weir plate is connected to the top plate, and a second gap is formed between the weir plate and the bottom plate.

[0018] Optionally, the distance between the weir plate and the side plate is 10 to 200 mm.

[0019] Optionally, the top plate, the bottom plate and the side plate together form a circular hole;

[0020] It also includes a tapered portion, which is arranged on the circular hole to form an annular airflow passage, and the annular airflow passage is communicated with the airflow channel.

[0021] Optionally, the diameter of the circular hole is less than 1500 mm.

[0022] Optionally, the weir plate is detachably connected to the air flow channel.

[0023] According to a second aspect of the present invention, a spray drying device is also provided, comprising a hot air distributor as described in any one of the first aspects.

[0024] The hot air distributor in the embodiment of the present application includes: an air inlet pipe, the air inlet pipe includes an air inlet and an air flow channel connected to the air inlet; a weir plate, the weir plate is arranged in the air flow channel and is perpendicular to the air flow direction in the air flow channel; wherein the gap between the weir plate and the inner wall surface of the air flow channel is 10 to 50 mm. Thus, the present application effectively avoids the problem of poor material drying effect caused by the accumulation of materials on the wall surface of the drying chamber through the control of the air flow by the weir plate.

[0025] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0027] Figure 1 It is a structural schematic diagram of a hot air distributor in one embodiment of the utility model.

[0028] Figure 2It is a cross-sectional view of a hot air distributor in one embodiment of the utility model.

[0029] Figure 3 It is a top view of a hot air distributor in one embodiment of the utility model.

[0030] Figure 4 yes Figure 3 AA section view.

[0031] Figure 5 yes Figure 3 BB cross-sectional view.

[0032] Description of reference numerals:

[0033] 101, air inlet pipe; 1011, top plate; 1012, bottom plate; 1013, side plate; 1014, air inlet; 1015, air flow channel; 1016, circular hole; 102, weir plate; 103, gap; 104, tapered portion; 105, annular air flow channel. DETAILED DESCRIPTION

[0034] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0035] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0036] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0037] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0038] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0039] In the following description, "connection" includes both a direct connection between the two and an indirect connection between the two via, for example, an adapter board, middleware, etc.

[0040] In the following description, "material" is only used to illustrate the working principle of the hot air distributor, the spray drying device and the spray drying method, and should not be regarded as a part of the spray drying device.

[0041] like Figures 1 to 5 As shown, the hot air distributor in the embodiment of the present application includes: an air inlet pipe 101, the air inlet pipe 101 includes an air inlet 1014 and an air flow channel 1015 connected to the air inlet 1014; a weir plate 102, the weir plate 102 is arranged in the air flow channel 1015 and is perpendicular to the air flow direction in the air flow channel 1015; wherein the gap between the weir plate 102 and the inner wall surface of the air flow channel 1015 is 10 to 50 mm.

[0042] Specifically, the air inlet pipe 101 described in the embodiment of the present application can be a tubular member, or it can be Figure 1 As shown, the square tube formed by the top plate 1011, the bottom plate 1012 and the side plate 1013, or other suitable structures, mainly functions to introduce airflow into the hot air distributor.

[0043] like Figure 2 As shown, the air flow channel 1015 in the embodiment of the present application is provided with a weir plate 102, and the weir plate 102 is arranged in the air flow channel 1015, and the weir plate 102 is perpendicular to the air flow direction in the air flow channel 1015, so that the air flow flowing into the air flow channel 1015 from the air inlet 1014 can flow evenly and smoothly to the hot air distributor after passing through the weir plate 102, and further flow to the drying chamber in the spray drying device, so as to achieve drying of the material.

[0044] Among them, in actual application, when the gap is not provided between the weir plate 102 and the inner wall surface of the air flow channel 1015, once the air flow from the air inlet 1014 is too large, not only will the accumulation of materials on the wall surface of the drying chamber become more serious than when the weir plate 102 is not provided, but also the air flow will accumulate in the hot air distributor, thereby affecting the stability of the spray drying device. When the gap between the weir plate 102 and the inner wall surface of the air flow channel 1015 is too large, the control ability of the weir plate 102 on the air flow and the role of stabilizing the air flow will gradually decrease, which will also easily cause the material to accumulate on the wall surface of the drying chamber.

[0045] Therefore, the embodiment of the present application sets the gap between the weir plate 102 and the inner wall of the air flow channel 1015 to 10 to 50 mm, for example, 20 mm, 30 mm or 40 mm, etc., which can not only significantly reduce the phenomenon of material accumulation in the drying chamber, but also effectively control the airflow when the air flow from the air inlet 1014 is too large, thereby significantly avoiding the problem of material easily accumulating on the wall of the drying chamber, resulting in poor drying effect of the material.

[0046] In one embodiment, the weir plate 102 is provided with a plurality of ventilation holes, and the apertures of the ventilation holes range from 1 to 10 mm.

[0047] Specifically, in practical applications, the aperture of the ventilation hole is closely related to the control of the weir plate 102 on the airflow.

[0048] For example, if the aperture of the ventilation hole is too small, it will be unfavorable for the inflow of airflow, and it will also easily cause the airflow to accumulate in the airflow channel 1015, resulting in poor airflow drying effect on the material in the drying chamber; and if the aperture of the ventilation hole is too large, the weir plate 102 cannot effectively adjust the flow rate of the airflow, and thus the weir plate 102 cannot better control the airflow, causing the material to accumulate on the wall of the drying chamber, resulting in poor drying effect of the material.

[0049] Therefore, in order to better achieve the control of the weir plate 102 on the airflow and prevent the airflow from accumulating in the airflow channel 1015, the aperture range of the ventilation hole in the embodiment of the present application is 1 to 10 mm.

[0050] Preferably, the aperture of the ventilation hole is in the range of 2 to 5 mm, such as 3 mm or 4 mm, etc. The weir plate 102 within this range can not only better control the airflow, but also better form an annular wind around the central axis in the airflow channel 1015, so as to further improve the drying effect of the airflow on the material after entering the drying chamber of the spray drying device.

[0051] In one embodiment, the thickness of the weir plate 102 is in the range of 1 to 10 mm.

[0052] Specifically, in the embodiment of the present application, by setting the thickness of the weir plate 102 to 1-10 mm, the flow rate of the airflow passing through the weir plate 102 can be better regulated.

[0053] It should be noted that the thickness of the weir plate 102 refers to the dimension between the two ends of the weir plate 102 along the flow direction of the airflow.

[0054] In one embodiment, the hot air distributor includes a plurality of weir plates 102 , which are arranged at intervals along the airflow direction in the airflow channel 1015 ; wherein the apertures of the ventilation holes of the plurality of weir plates 102 increase successively along the airflow direction in the airflow channel 1015 .

[0055] Specifically, Figure 2As shown, when the airflow enters the air inlet pipe 101 from the air inlet 1014, the airflow has the highest flow rate, and when the airflow surrounds the air inlet pipe 101 for one circle, the airflow velocity drops to a relatively minimum value. Therefore, in order to make the airflow passing through each position of the air inlet pipe 101 have the same flow rate, the embodiment of the present application provides a plurality of weir plates 102 arranged at intervals in the airflow channel 1015, and the apertures of the ventilation holes of the plurality of weir plates 102 are increased successively along the airflow flow direction in the airflow channel 1015, thereby effectively realizing the weir plate 102 to adjust the airflow velocity, so that the airflow at each position of the air inlet pipe 101 has the same flow rate.

[0056] Therefore, after the airflow enters the drying chamber of the spray drying device, the phenomenon of material accumulation on the wall surface of the drying chamber can be effectively reduced, and the drying effect of the spray drying device on the material is significantly improved.

[0057] In one embodiment, the hot air distributor includes a plurality of weir plates 102 , which are arranged at intervals along the airflow direction in the airflow channel 1015 ; wherein the hole density of the ventilation holes of the plurality of weir plates 102 increases successively along the airflow direction in the airflow channel 1015 .

[0058] Specifically, Figure 2 As shown, when the airflow enters the air inlet pipe 101 from the air inlet 1014, the airflow has the highest flow rate, and when the airflow surrounds the air inlet pipe 101 for one circle, the airflow velocity drops to a relatively minimum value. Therefore, in order to make the airflow passing through each position of the air inlet pipe 101 have the same flow rate, the embodiment of the present application provides a plurality of weir plates 102 arranged at intervals in the airflow channel 1015, and the hole density of the ventilation holes of the plurality of weir plates 102 increases successively along the airflow flow direction in the airflow channel 1015, thereby effectively realizing the adjustment of the airflow velocity by the weir plates 102, so that the airflow at each position of the air inlet pipe 101 has the same flow rate.

[0059] Therefore, after the airflow enters the drying chamber of the spray drying device, the phenomenon of material accumulation on the wall surface of the drying chamber can be effectively reduced, and the drying effect of the spray drying device on the material is significantly improved.

[0060] In one embodiment, the weir plate 102 is formed by stacking at least two porous plates with different pore sizes; or, the weir plate 102 is formed by stacking at least two porous plates with different pore densities.

[0061] Specifically, Figure 4 and Figure 5As shown, when the airflow enters the air inlet pipe 101 from the air inlet 1014, the airflow has the highest flow velocity, and when the airflow surrounds the air inlet pipe 101 for one circle, the airflow velocity drops to a relatively minimum value. Therefore, in order to make the airflow passing through each position of the air inlet pipe 101 have the same flow velocity, the embodiment of the present application forms the weir plate 102 by stacking at least two porous plates with different apertures, so that after the airflow passes through the weir plate 102 with different apertures, the airflow at each position of the air inlet pipe 101 has the same flow velocity.

[0062] Therefore, after the airflow enters the drying chamber of the spray drying device, the phenomenon of material accumulation on the wall surface of the drying chamber can be effectively reduced, and the drying effect of the spray drying device on the material is significantly improved.

[0063] In addition, the embodiment of the present application can also form the weir plate 102 by stacking at least two porous plates with different hole densities, so that after the airflow passes through the weir plate 102 with different hole densities, the airflow at each position of the air inlet pipe 101 has the same flow rate.

[0064] In one embodiment, the weir plate 102 has multiple sections with different pore sizes and different pore densities.

[0065] Specifically, since the airflow has the highest flow velocity when it enters the air inlet pipe 101 from the air inlet 1014, and the airflow velocity drops to a relatively minimum value after the airflow surrounds the air inlet pipe 101 for one circle, in order to make the airflow passing through each position of the air inlet pipe 101 have the same flow velocity, the embodiment of the present application arranges the weir plate 102 to have multiple parts with different pore diameters and different pore densities, so that after the airflow passes through the weir plate 102 with different pore diameters and different pore densities, the airflow at each position of the air inlet pipe 101 has the same flow velocity.

[0066] Therefore, after the airflow enters the drying chamber of the spray drying device, the phenomenon of material accumulation on the wall surface of the drying chamber can be effectively reduced, and the drying effect of the spray drying device on the material is significantly improved.

[0067] In addition, the weir plate 102 of the embodiment of the present application can be configured as four parts, so as to be more conveniently assembled on the air inlet pipe 101 to achieve control of the air flow rate. The four parts are four porous plates with different apertures; or the four parts are four porous plates with different aperture densities; or the four parts are a combination of porous plates with different apertures and porous plates with different aperture densities.

[0068] In one embodiment, the air inlet duct 101 includes a top plate 1011, a bottom plate 1012 and a side plate 1013, wherein the top plate 1011, the bottom plate 1012 and the side plate 1013 together form the air inlet 1014 and the air flow channel 1015; wherein the weir plate 102 is connected to the bottom plate 1012, and a first gap 103 is formed between the weir plate 102 and the top plate 1011; or, the weir plate 102 is connected to the top plate 1011, and a second gap is formed between the weir plate 102 and the bottom plate 1012.

[0069] Specifically, Figure 1 As shown, the air inlet duct 101 described in the embodiment of the present application is a top plate 1011, a bottom plate 1012 and two side plates 1013 that together form an annular structure surrounding the central axis, and the annular structure has a rectangular air inlet 1014 and an annular airflow channel 1015, so that when the airflow enters the airflow channel 1015 from the air inlet 1014, it can flow along the annular airflow channel 1015 and form an annular wind surrounding the central axis.

[0070] When one end of the weir plate 102 is connected to the bottom plate 1012, a first gap 103 is formed between the other end of the weir plate 102 and the top plate 1011, and the size of the first gap 103 perpendicular to the flow direction of the airflow is in the range of 10 to 50 mm. When one end of the weir plate 102 is connected to the top plate 1011, a second gap is formed between the other end of the weir plate 102 and the bottom plate 1012, and the size of the second gap perpendicular to the flow direction of the airflow is in the range of 10 to 50 mm.

[0071] In practical applications, when the height of the weir plate 102 is equal to the height of the air inlet 1014, that is, there is no first gap 103 or the second gap between the weir plate 102 and the inner wall of the airflow channel 1015, once the airflow from the air inlet 1014 is too large, not only will the accumulation of materials on the wall of the drying chamber become more serious than when the weir plate 102 is not set, but it will also cause the airflow to accumulate in the hot air distributor, thereby affecting the stability of the spray drying device. When the height of the weir plate 102 differs too much from the height of the air inlet 1014, that is, the size of the first gap 103 or the second gap is too large, the control ability of the weir plate 102 on the airflow and the role of stabilizing the airflow are gradually reduced, which is also easy to cause the material to accumulate on the wall of the drying chamber.

[0072] Therefore, in the embodiment of the present application, by setting the difference between the height of the weir plate 102 and the height of the air inlet 1014 to be 10 to 50 mm, that is, the size of the first gap 103 or the second gap is 10 to 50 mm, for example, 20 mm, 30 mm or 40 mm, etc., not only can the phenomenon of material accumulation in the drying chamber be significantly reduced, but also when the airflow from the air inlet 1014 is too large, the airflow can be effectively controlled, thereby significantly avoiding the problem of material easily accumulating on the wall of the drying chamber, resulting in poor drying effect of the material.

[0073] Preferably, the difference between the height of the weir plate 102 and the height of the air inlet 1014 is 20-50 mm, for example, 25 mm, 35 mm or 45 mm.

[0074] Therefore, the weir plate 102 arranged within this range can not only better realize the control of the airflow to further improve the adaptability of the spray drying device, but also can better form an annular wind around the central axis in the airflow channel 1015 to further improve the drying effect of the airflow on the material after entering the drying chamber of the spray drying device.

[0075] It should be noted that the height of the air inlet 1014 in the embodiment of the present application refers to the distance between the top plate 1011 and the bottom plate 1012 . At this time, the height of the weir plate 102 refers to the size between the two ends of the weir plate 102 along the height direction of the air inlet 1014 .

[0076] In one embodiment, the distance between the weir plate 102 and the side plate 1013 is 10-200 mm.

[0077] Specifically, Figure 4 and Figure 5 As shown, in order to allow the airflow to flow along the annular airflow channel 1015 to form annular wind, and to effectively reduce the phenomenon of material accumulation on the wall surface of the drying chamber after the airflow enters the drying chamber, the distance between the weir plate 102 and the side plate 1013 is preferably 10 to 200 mm.

[0078] In one embodiment, the top plate 1011, the bottom plate 1012 and the side plate 1013 together form a circular hole 1016; the hot air distributor also includes a conical portion 104, and the conical portion 104 is arranged on the circular hole 1016 to form an annular airflow channel 105, and the annular airflow channel 105 is connected to the airflow channel 1015.

[0079] Specifically, Figures 3 to 5As shown, the air inlet pipe 101 described in the embodiment of the present application can surround the central axis to form a circular hole 1016 with the central axis as the center, and the weir plate 102 can surround the circular hole 1016 so that the airflow processed by the weir plate 102 can be tangent to the axial direction of the circular hole 1016, and the weir plate 102 can also achieve fine control of the airflow.

[0080] Among them, after the conical portion 104 is arranged in the circular hole 1016, a downwardly inclined annular airflow channel 105 can be formed between the conical portion 104 and the air inlet pipe 101, one end of the annular airflow channel 105 is connected to the airflow channel 1015, and the other end of the annular airflow channel 105 is connected to the drying chamber of the spray drying device.

[0081] Thus, the airflow entering the air inlet pipe 101 from the air inlet 1014 and processed by the weir plate 102 can form an annular wind with uniform flow rate in the airflow channel 1015. Since the airflow channel 1015 is connected to the annular airflow channel 105, a part of the annular wind can enter the drying chamber of the spray drying device through the annular airflow channel 105 to achieve drying of the material in the drying chamber.

[0082] In one embodiment, the diameter of the circular hole 1016 is less than 1500 mm.

[0083] Specifically, Figure 1 and Figure 3 As shown, in actual application, the diameter of the circular hole 1016 is within a certain range, which can more effectively reduce the phenomenon of material accumulation on the wall surface of the drying chamber. In the embodiment of the present application, the diameter of the circular hole 1016 is less than 1500mm, so that after the conical part 104 is installed in the circular hole 1016, the airflow can more easily enter the drying chamber of the spray drying device from the annular airflow channel 105, thereby drying the material in the drying chamber.

[0084] In one embodiment, the weir plate 102 is detachably connected to the air inlet pipe 101 .

[0085] Specifically, in actual applications, the welding points generated after the weir plate 102 is welded to the bottom plate 1012 or the top plate 1011 will cause rough walls to appear in the air flow channel 1015. When the airflow passes through these rough walls, it is easy for the airflow to rub against the welding points, causing a large number of metal particles to fall off the welding points. The fallen metal particles will eventually be brought into the drying chamber by the airflow and contaminate the dried material. Therefore, the present application detachably connects the weir plate 102 to the air inlet pipe 101 so that the weir plate 102 can be pre-polished into a mirror surface, thereby greatly avoiding the phenomenon of large-scale falling of metal particles caused by the friction of the airflow against the weir plate 102, and effectively avoiding the contamination of the dried material by metal particles.

[0086] In addition, when the air intake volume of the hot air distributor is small, the embodiment of the present application may also use bonding to fix the weir plate 102 and the air inlet pipe 101.

[0087] According to another embodiment of the present application, a spray drying device is provided, comprising the hot air distributor as described in the above embodiment.

[0088] Specifically, the embodiment of the present application sets the gap between the weir plate 102 and the inner wall of the air flow channel 1015 to 10 to 50 mm, so that the air flow velocity entering the air flow channel 1015 from the air inlet 1014 can be adjusted by the weir plate 102. When the air flow enters the drying chamber of the spray drying device through the annular air flow channel 105 to dry the material in the drying chamber, it can effectively avoid the problem of poor material drying effect caused by the material being easily accumulated on the wall of the drying chamber.

[0089] According to another embodiment of the present application, a spray drying method is provided, and the spray drying method is applied to the spray drying device as described in the above embodiment, wherein the spray drying method comprises the following steps:

[0090] A1, open the air inlet 1014, so that the airflow enters the airflow channel 1015 from the air inlet 1014 and passes through the weir plate 102 in the airflow channel 1015;

[0091] A2, the airflow passing through the weir plate 102 flows into the drying chamber to dry the material in the drying chamber.

[0092] Specifically, in the embodiment of the present application, air flows into the air inlet pipe 101 from the air inlet 1014, and then forms an annular wind with uniform flow rate in the air flow channel 1015 after being processed by the weir plate 102. The hot air distributor and the drying chamber are then connected, so that the annular wind with uniform flow rate formed in the air flow channel 1015 can enter the drying chamber of the spray drying device, thereby drying the material in the drying chamber, and effectively avoiding the problem that the material is easily accumulated on the wall of the drying chamber, resulting in poor drying effect of the material.

[0093] In one embodiment, step A2 further includes:

[0094] B21, the air flow passing through the weir plate 102 flows into the drying chamber through the annular air flow channel 105 to dry the material in the drying chamber.

[0095] Specifically, the embodiment of the present application connects the airflow channel 1015 with the drying chamber through the annular airflow channel 105, so that the annular wind with uniform flow rate formed in the airflow channel 1015 can more easily enter the drying chamber to dry the material in the drying chamber, thereby effectively improving the drying effect of the airflow on the material.

[0096] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0097] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A hot air distributor, characterized in that: include: An air inlet pipe (101), the air inlet pipe (101) comprising an air inlet (1014) and an air flow channel (1015) connected to the air inlet (1014); a weir plate (102), wherein the weir plate (102) is disposed in the airflow channel (1015) and is perpendicular to the airflow direction in the airflow channel (1015); Wherein, the gap between the weir plate (102) and the inner wall surface of the airflow channel (1015) is 10 to 50 mm.

2. The hot air distributor according to claim 1, characterized in that: The weir plate (102) is provided with a plurality of ventilation holes, and the apertures of the ventilation holes range from 1 to 10 mm.

3. The hot air distributor according to claim 2, characterized in that: The hot air distributor comprises a plurality of weir plates (102), wherein the plurality of weir plates (102) are arranged at intervals along the air flow direction in the air flow channel (1015); The apertures of the ventilation holes of the plurality of weir plates (102) increase sequentially along the airflow flow direction in the airflow channel (1015).

4. The hot air distributor according to claim 2, characterized in that: The hot air distributor comprises a plurality of weir plates (102), wherein the plurality of weir plates (102) are arranged at intervals along the air flow direction in the air flow channel (1015); The hole density of the ventilation holes of the plurality of weir plates (102) increases sequentially along the airflow flow direction in the airflow channel (1015).

5. The hot air distributor according to claim 1, characterized in that: The weir plate (102) is composed of at least two porous plates with different pore sizes stacked together; Alternatively, the weir plate (102) is formed by stacking at least two porous plates with different pore densities.

6. The hot air distributor according to claim 1, characterized in that: The air inlet pipe (101) comprises a top plate (1011), a bottom plate (1012) and a side plate (1013), wherein the top plate (1011), the bottom plate (1012) and the side plate (1013) together form the air inlet (1014) and the air flow channel (1015); The weir plate (102) is connected to the bottom plate (1012), and a first gap (103) is formed between the weir plate (102) and the top plate (1011); or, the weir plate (102) is connected to the top plate (1011), and a second gap is formed between the weir plate (102) and the bottom plate (1012).

7. The hot air distributor according to claim 6, characterized in that: The distance between the weir plate (102) and the side plate (1013) is 10 to 200 mm.

8. The hot air distributor according to claim 6, characterized in that: The top plate (1011), the bottom plate (1012) and the side plate (1013) are combined to form a circular hole (1016); It also includes a tapered portion (104), wherein the tapered portion (104) is disposed on the circular hole (1016) to form an annular airflow passage (105), and the annular airflow passage (105) is connected to the airflow channel (1015).

9. The hot air distributor according to claim 8, characterized in that: The diameter of the circular hole (1016) is less than 1500 mm.

10. The hot air distributor according to claim 1, characterized in that: The weir plate (102) is detachably connected to the air flow channel (1015).

11. A spray drying device, characterized in that: Comprising the hot air distributor according to any one of claims 1 to 10.

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