A drying apparatus for producing pancreatic trypsin

Abstract

The present invention relates to a drying device for producing pancreatic trypsin, comprising a drying mechanism for drying material, a hot air mechanism for providing hot air for the drying mechanism, a spraying mechanism for dispersing the material in the drying mechanism, and a separating mechanism for collecting the product, wherein the drying mechanism has a drying cavity, the spraying mechanism has a nozzle extending into the drying cavity from the center of the top of the drying cavity, the hot air mechanism generates hot air entering the drying cavity from the middle of the drying cavity and flowing upwards along the inner wall of the upper part of the drying cavity to the top of the drying cavity and then downwards, the hot air contacts the liquid droplets sprayed by the spraying mechanism to rapidly evaporate the water in the liquid droplets, and the dried material is carried into the separating mechanism by the hot air, the air is discharged by an exhaust pipe, and the product remains in the separating mechanism. The present invention has the effects of not adhering to the inner wall, improving product quality and production efficiency.

Description

Technical Field

[0001] This invention relates to the field of spray drying technology, and more specifically to a drying apparatus for producing trypsin. Background Technology

[0002] Casein is a light yellow polypeptide powder produced by digesting casein with pancreatic enzymes, followed by refining and drying. It is easily soluble in water and rich in various amino acids and vitamins, especially tryptophan. It is widely used in the production of high-quality antibiotics, vitamins, pharmaceuticals, amino acids, organic acids, enzyme preparations, xanthan gum, and other fermentation industries.

[0003] Casein is typically dried using spray drying. However, in common spray dryers, the raw material sprayed by the spray mechanism is in a wet state, making it difficult to achieve uniform droplet size. Consequently, some larger droplets are easily thrown onto the inner wall of the spray dryer shell by airflow and inertia. These droplets adhere to the inner wall and are difficult to remove, eventually accumulating and even charring upon contact with hot air. This affects both the efficiency and quality of spray drying. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a drying apparatus for producing casein, aiming to solve the problem of droplets adhering to the inner wall during spray drying. Another objective of this invention is to improve product quality and production efficiency.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A drying apparatus for producing casein includes a drying mechanism for drying materials, a hot air mechanism for providing hot air to the drying mechanism, a spray mechanism for dispersing materials within the drying mechanism, and a separation mechanism for collecting the product. The drying mechanism has a drying chamber. The nozzle of the spray mechanism extends into the drying chamber from the top center. The hot air generated by the hot air mechanism enters the drying chamber from the middle and flows upward along the upper inner wall of the drying chamber to the top and then downward. The hot air contacts the droplets sprayed by the spray mechanism, causing the moisture in the droplets to evaporate rapidly. The hot air carries the dried material into the separation mechanism, and the air is discharged through an exhaust pipe. The product remains in the separation mechanism.

[0007] The fundamental reason for spray drying wall adhesion is that the material comes into contact with the inner wall of the drying chamber before it is completely dried, thus adhering to the inner wall. This invention creatively moves the hot air inlet to the center of the drying chamber. This results in two vertical flows of hot air within the drying chamber: one upward flow along the inner wall of the drying chamber, and another downward flow from the top center of the drying chamber. That is, as the material moves outward from the drying chamber after being dispersed by the spray mechanism, it experiences two hot air contacts. Compared to existing technologies, this results in more complete drying, lower product moisture content, and because the hot air flows downward from the top center of the drying chamber, it blows the droplets that have just detached from the spray mechanism downwards, changing their direction of movement and making them more inclined to move downwards. At this point, most of the smaller droplets dispersed by the spray mechanism have already dried and lost water, reducing their weight and inertia. The droplets, weakened by the downward flow of hot air, move towards the bottom of the drying chamber, without having a chance to contact the inner wall. Only the larger, undispersed droplets, due to their large size, only experience a slight temperature increase upon first contact with the hot air, maintaining significant inertia and continuing to move outward. As the droplets continue to move outward and approach the inner wall of the drying chamber, hot air flows upward along the inner wall, again blocking the droplets' movement and subjecting them to a second round of hot air drying. At this point, because the droplets themselves have already risen in temperature, they are easily heated again by the hot air and rapidly evaporate. After drying and losing water, their weight decreases, their inertia weakens, and they are blown away by the hot air. This invention allows droplets of different diameters to be contacted with hot air once or twice, depending on their volume, ensuring thorough drying without causing wall adhesion problems.

[0008] Because the material of this invention does not stick to the inner wall, it does not require machine shutdown for cleaning. Since the material will not become sticky or char due to prolonged exposure to high temperatures, the dried casein of this invention has a low water content. Compared with commercially available products, it has a pure color, no charred odor, good water solubility, and its aqueous solution is clearer than that of commercially available products.

[0009] The advantage of this invention over existing spray drying devices is that, under the same technical parameters, it can achieve the effect of preventing materials from sticking to the inner wall without using scrapers or changing the hot air power, and the product is dried more thoroughly and has better quality.

[0010] Furthermore, the upper part of the drying chamber is ellipsoidal and the lower part is conical. The upper end of the drying chamber has a downwardly protruding frustum-shaped feed section. The side of the feed section smoothly transitions with the inner wall of the drying chamber, so that the upper cross section of the drying chamber has two symmetrical parabolic shapes.

[0011] The upper section of the drying chamber has two symmetrical parabolic shapes, which can effectively guide the hot air. This makes it easier for the hot air to flow along the inner wall of the drying chamber in the early stage, and also helps the hot air to smoothly transfer the material to the center of the drying chamber in the later stage, without causing the problem of accumulation and sticking to the wall due to dead corners in the drying chamber.

[0012] Furthermore, the nozzle of the spraying mechanism is located below the feed section and above the intersection of the tangents at the lower end of the side of the feed section.

[0013] The nozzle of the spray mechanism is positioned to avoid direct hot airflow, preventing the nozzle from overheating due to the high temperature generated by the direct hot air (here, "high temperature" refers to the high temperature of the hot air, exceeding the temperature of the material and the nozzle). See the attached diagram in the instruction manual. Figure 3 As shown by the dotted line, this reduces the possibility of nozzle clogging and also ensures that the material dispersed by the nozzle can be fully contacted by hot air as it moves towards the inner wall of the drying chamber. The first contact is with the hot air flowing downward from the top center of the drying chamber. This contact dries the droplets and causes them to move further downward. The second contact is with the hot air flowing upward along the inner wall of the drying chamber. This contact dries the droplets that were not dried in the first contact with the hot air. After drying, the material loses water, its weight decreases, and its inertia also decreases. It can be easily changed direction by the hot air and thus no longer adheres to the inner wall of the drying chamber.

[0014] Furthermore, a microporous plate is provided on the lower conical inner wall of the drying chamber, and a ventilation cavity is formed between the microporous plate and the lower conical inner wall of the drying chamber. A ventilation mechanism for air circulation into the ventilation cavity is provided outside the drying mechanism.

[0015] The ventilation system supplies air to the ventilation chamber, and the air in the ventilation chamber flows into the drying chamber through the microporous plate. On the one hand, this causes the high-temperature air in the drying chamber to drop rapidly, and a gentle airflow is used to carry the dried material, preventing the product from remaining in the high-temperature air for too long and affecting its quality. On the other hand, it also forms a fluidized bed, causing the dried material to flow and continue to evaporate moisture, further drying it. In addition, the material falling towards the lower inner wall of the ventilation chamber will not remain on the lower inner wall of the drying chamber, but will move smoothly downward and be carried into the separation mechanism.

[0016] Furthermore, the ventilation mechanism includes a ventilation fan and a ventilation duct, and a heat exchanger is provided between the ventilation duct and the exhaust pipe of the separation mechanism.

[0017] When the ventilation system ventilates, it first exchanges heat with the exhaust duct to raise the temperature to a certain level, and then mixes with the hot air in the drying chamber to make the fluidized bed effect more obvious. However, it does not cause the temperature in the lower part of the drying chamber to drop too much due to the introduction of lower temperature air, thus avoiding water vapor condensation caused by excessive cooling. It also forms a replenishing airflow to reduce the partial pressure of water vapor in the drying chamber and prevent the product from becoming damp during transportation.

[0018] Furthermore, the hot air mechanism includes a hot air fan, a heater, an air distribution ring, and multiple hot air pipes. The air outlet of the hot air fan is connected to the heater, the heater is connected to the air distribution ring, and multiple hot air pipes are connected to the air distribution ring. The multiple hot air pipes are arranged in a ring array outside the drying chamber.

[0019] Furthermore, multiple hot air ducts are connected to the middle of the drying chamber, and a guide plate is provided inside the drying chamber. The guide plate is an annular arc-shaped plate made of the same material as the microporous plate. The lower end of the guide plate is fixedly connected to the inner wall of the drying chamber, and the middle part protrudes arc-shaped towards the center of the drying chamber. There is a gap between the upper end of the guide plate and the inner wall of the drying chamber, and an air collecting ring is formed between the guide plate and the inner wall of the drying chamber.

[0020] Furthermore, the plurality of hot air ducts are connected to the air collecting ring along the radial direction of the air distribution ring.

[0021] To increase the hot air velocity, avoid the hot air from rotating inside the drying chamber, reduce the flow time of the hot air inside the drying chamber, and prevent the rotating hot air from causing the dried material to be thrown out of the inner wall of the drying chamber.

[0022] Furthermore, the drying mechanism includes an outer shell and an inner shell. The space enclosed by the inner wall of the inner shell is a drying chamber. An insulation layer is provided between the inner shell and the outer shell. The insulation layer wraps around the upper part of the inner shell, the air distribution ring, and the hot air duct.

[0023] Furthermore, the outer shell and the inner shell are provided with corresponding transparent windows, and a channel is provided between the transparent windows of the outer shell and the inner shell. A light source with a light emission direction facing the central axis of the inner shell is provided in the channel, and a controller is connected to the outer shell.

[0024] The beneficial effects of the present invention through the above technical solution are as follows:

[0025] Under the same technical parameters, this invention allows for multiple hot air contacts with the droplets, resulting in more thorough drying of the product. It achieves the goal of preventing the material from sticking to the inner wall without using a scraper or changing the hot air power, eliminating the need for machine shutdown for cleaning. It also avoids the problems of the material becoming sticky and charring due to prolonged contact with high-temperature air or high-temperature inner walls, and results in more thorough drying and better quality of the product.

[0026] This invention can improve product quality, making the product have the characteristics of low water content, purer color, no charred odor, good water solubility, and clearer aqueous solution compared to commercially available products.

[0027] This invention introduces air into the lower part of the drying chamber to form a fluidized bed, which facilitates product collection and reduces the partial pressure of water vapor in the drying chamber, preventing water vapor from condensing in the pipeline during transportation and avoiding product re-moistening during transportation.

[0028] This invention employs a higher inlet air temperature, improves processing efficiency, and expands the parameter adjustment range, resulting in better performance compared to existing technologies. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 This is the front view of the present invention;

[0031] Figure 3 This is a cross-sectional front view of the present invention;

[0032] Figure 4 yes Figure 3 Sectional view along line AA;

[0033] Figure 5 yes Figure 3 Enlarged view of part B;

[0034] Figure 6 This is a trajectory diagram of material movement during the drying process of this invention.

[0035] The attached diagram is labeled as follows: 1. Drying mechanism; 2. Hot air mechanism; 3. Spraying mechanism; 4. Separation mechanism; 5. Drying chamber; 6. Nozzle; 7. Feeding section; 8. Microporous plate; 9. Ventilation mechanism; 10. Ventilation fan; 11. Ventilation duct; 12. Heat exchanger; 13. Hot air fan; 14. Heater; 15. Air distribution ring; 16. Hot air pipe; 17. Air guide plate; 18. Outer shell; 19. Inner shell; 20. Insulation layer; 21. Transparent window. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0037] It should be noted that, in this embodiment, "upper" and "lower" refer to the directions shown in the attached drawings, and "inner" and "outer" refer to directions closer to or further from a specific geometric center. In this embodiment, "droplet" refers to a solution formed by the dispersion of the purified and filtered liquid after casein digestion by trypsin through a spray mechanism, which is then ejected or sprayed onto the container wall by an atomizing nozzle. "Material" refers to the substance transformed from "droplet" during the evaporation and drying process. "Product" refers to the dried product. In this embodiment, "high temperature" refers to the temperature of the hot air heated by the hot air mechanism.

[0038] like Figure 1 , Figure 2 and Figure 3As shown, a drying apparatus for producing casein includes a drying mechanism 1 for drying materials, a hot air mechanism 2 for providing hot air to the drying mechanism 1, a spray mechanism 3 for dispersing materials within the drying mechanism 1, and a separation mechanism 4 for collecting the product. The drying mechanism 1 has a drying chamber 5. The nozzle 6 of the spray mechanism 3 extends into the drying chamber 5 from the top center. The nozzle 6 is a rotating atomizing nozzle. The hot air generated by the hot air mechanism 2 enters the drying chamber 5 from the middle and flows upward along the upper inner wall of the drying chamber 5 to the top of the drying chamber 5 and then downward. The hot air contacts the droplets sprayed by the spray mechanism 3, causing the moisture in the droplets to evaporate rapidly, and carries the dried material into the separation mechanism 4. The separation mechanism 4 is a cyclone separator or a bag filter. The air is discharged through an exhaust pipe, and the product remains in the separation mechanism 4.

[0039] In order to allow hot air to flow smoothly along the inner wall of the drying chamber 5, the upper part of the drying chamber 5 is ellipsoidal and the lower part is conical. Only the upper half of the ellipsoid is taken. The upper end of the drying chamber 5 has a downwardly protruding frustum-shaped feed section 7. The side of the feed section 7 smoothly transitions with the inner wall of the drying chamber 5, so that the upper cross section of the drying chamber 5 has two symmetrical parabolic shapes.

[0040] The nozzle 6 of the spraying mechanism 3 is located below the feed section 7 and above the intersection of the tangents at the lower end of the side of the feed section 7. Because the feed section 7 is truncated cone-shaped, the tangents at the lower end of the side of the feed section 7 all intersect at one point, and the nozzle 6 is located above that point.

[0041] The lower conical inner wall of the drying chamber 5 is provided with a microporous plate 8, and a ventilation cavity is formed between the microporous plate 8 and the lower conical inner wall of the drying chamber 5. A ventilation mechanism 9 is provided outside the drying mechanism 1 to allow air to pass into the ventilation cavity. In this embodiment, the microporous plate 8 is a steel plate with a thickness of 3 mm and a micropore diameter of 0.15 mm. The micropores are evenly distributed on the microporous plate 8.

[0042] The ventilation mechanism 9 includes a ventilation fan 10 and a ventilation duct 11, and a heat exchanger 12 is provided between the ventilation duct 11 and the exhaust pipe of the separation mechanism 4.

[0043] The hot air mechanism 2 includes a hot air fan 13, a heater 14, an air distribution ring 15, and multiple hot air pipes 16. The air outlet of the hot air fan 13 is connected to the heater 14, the heater 14 is connected to the air distribution ring 15, and multiple hot air pipes 16 are connected to the air distribution ring 15. The multiple hot air pipes 16 are arranged in a ring array outside the drying chamber 5.

[0044] like Figure 5As shown, multiple hot air pipes 16 are connected to the middle of the drying chamber 5. The drying chamber 5 is provided with an air guide plate 17. The air guide plate 17 is an annular arc-shaped plate of the same material as the microporous plate 8. The lower end of the air guide plate 17 is fixedly connected to the inner wall of the drying chamber 5, and the middle part protrudes arc-shaped towards the center of the drying chamber 5. There is a gap between the upper end of the air guide plate 17 and the inner wall of the drying chamber 5. An air collecting ring is formed between the air guide plate 17 and the inner wall of the drying chamber 5. Hot air flows downward from the gap between the air guide plate 17 and the inner wall of the drying chamber 5 out of the air collecting ring.

[0045] like Figure 4 As shown, multiple hot air ducts 16 are connected to the air collecting ring along the radial direction of the air distribution ring 15.

[0046] The drying mechanism 1 includes an outer shell 18 and an inner shell 19. The space enclosed by the inner wall of the inner shell 19 is the drying chamber 5. A heat insulation layer 20 is provided between the inner shell 19 and the outer shell 18. The heat insulation layer 20 is wrapped around the upper part of the inner shell 19, the air distribution ring 15, and the hot air pipe 16.

[0047] The outer shell 18 and the inner shell 19 are provided with corresponding transparent windows 21. A channel is provided between the transparent windows 21 of the outer shell 18 and the inner shell 19. A light source with a light emission direction facing the central axis of the inner shell 19 is provided in the channel. A controller is connected to the outer shell 18.

[0048] Based on the above improvements of the present invention, it has surpassed the spray drying device in the prior art, but the present invention has further advantages:

[0049] In this embodiment, the air temperature (i.e., the inlet air temperature) in the air collecting ring is 190℃~210℃, the spray nozzle 6 of the spray mechanism 3 rotates at 15000 rpm, the air temperature (i.e., the outlet air temperature) in the separation mechanism 4 is 85℃~95℃, and the material stays in the drying chamber 5 for 1 second~2 seconds.

[0050] The drying process of this invention is as follows: Figure 6As shown in the figure, the material movement trajectory inside the drying chamber during the drying process is illustrated. The solid lines with arrows represent the flow trajectory of hot air, while the dashed lines with arrows represent the movement trajectories of different droplets. When the material moves outward from the drying chamber after being dispersed by the spray mechanism, the hot air flows downward from the top center of the drying chamber 5, blowing the droplets that have just detached from the spray mechanism 3 downwards. This changes the direction of the droplets' movement, making them more inclined to move downwards. At this time, most of the smaller droplets dispersed by the spray mechanism 3 have already dried and lost water, reducing their weight and inertia. They are carried by the downward-flowing hot air towards the bottom of the drying chamber 5, where the contact time with the hot air is short. Only the larger droplets that are not completely dispersed, due to their large size, are carried by the hot air during the first contact. When in contact with hot air, the temperature rises slightly, but the moisture cannot be completely evaporated. It still maintains a large inertia and continues to move outward. When the droplet continues to move outward and approaches the inner wall of the drying chamber 5, hot air flows upward along the inner wall of the drying chamber and comes into contact with the droplet again, and dries the droplet a second time. At this position, because the droplet itself has already risen in temperature, it is easily heated again by the hot air and evaporates quickly. After being dried and losing water, its weight is small, its inertia is weakened, and it is blown away by the hot air. The contact time with the hot air is longer than that of other droplets, so it can be fully dried. The present invention allows droplets of different diameters to have different contact times with the hot air according to their different volumes, so as to achieve sufficient drying without causing the problem of sticking to the wall.

[0051] In this embodiment, the outlet air temperature of 85℃~95℃ is not achieved by cooling the material to 85℃~95℃ after the hot air dries it, but rather by immediately mixing the hot air with the air supplied by the ventilation mechanism 9 after drying the material to achieve cooling. In fact, the temperature of the hot air after drying the material remains as high as 110℃~130℃ (this temperature can be adjusted and controlled by the feed rate, heating power, and hot air velocity). It only cools to 85℃~95℃ after mixing with the air supplied by the ventilation mechanism 9. In actual production, this invention 19… When the high temperature of 0℃ to 210℃ comes into contact with the droplets sprayed by the spray mechanism 3, the droplets rapidly evaporate and absorb heat, causing the hot air to quickly cool down to about 110℃. Furthermore, during the 1 to 2 seconds that the material remains in the drying chamber 5, a portion of the time is spent mixing with the air from the ventilation mechanism 9 for cooling. Therefore, the material in this invention has a very short residence time at high temperatures, which will not affect product quality. Because few droplets can approach the inner wall of the drying chamber 5, the temperature at the inner wall of the drying chamber 5 is maintained at 190℃ to 210℃. If the droplet has not yet completely evaporated after two hot air contacts, it will come into contact with the inner wall of the drying chamber 5. Because there is a large temperature difference between the inner wall of the drying chamber 5 and the droplet (the upper limit temperature for the droplet to maintain a liquid state is 96℃~98℃, and the temperature of the inner wall of the drying chamber 5 is 190℃~210℃, with a temperature difference of 90℃~110℃), the Leiden-Frost effect occurs between the droplet and the inner wall of the drying chamber 5. The droplet will not wet the inner wall of the drying chamber 5, but there will be a vapor layer with very low heat transfer efficiency between the droplet and the inner wall of the drying chamber 5. This vapor layer causes the droplet to float in a suspended state near the inner wall of the drying chamber 5 and be blown along the inner wall of the drying chamber by the upward flow of hot air. During the subsequent falling process, it continues to complete the drying process. As it moves and comes into contact with the hot air, it dries and loses weight. The material of this invention is immediately carried away by the wind after drying and will not come into contact with the hot air flowing upward along the inner wall of the drying chamber. Before drying, due to its large weight and inertia, it will try to maximize the opportunity to come into contact with the hot air to achieve full drying. The droplet achieves different drying processes according to its own volume and weight.

[0052] Because the inlet air temperature is increased, the present invention can achieve a higher flow rate in the same volume as the prior art, thereby improving the production efficiency of the product. Even if droplets move along the inner wall of the drying chamber, they will not wet the inner wall of the drying chamber and will not produce an adhesion effect. Therefore, it is not necessary to consider the problem of uneven droplet size generated during atomization, nor is it necessary to consider whether the droplets will impact the inner wall of the drying chamber. The present invention has a wider adjustment range in terms of material flow rate and nozzle speed adjustment compared to the prior art.

[0053] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various modifications can be made to the technical solutions of the present invention without departing from the spirit of the present invention or the scope of disclosure.

Claims

1. A drying apparatus for producing trypsin, comprising a drying mechanism (1) for drying materials, a hot air mechanism (2) for supplying hot air to the drying mechanism (1), a spray mechanism (3) for dispersing materials within the drying mechanism (1), and a separation mechanism (4) for collecting the product, characterized in that, The drying mechanism (1) has a drying chamber (5). The nozzle (6) of the spray mechanism (3) extends into the drying chamber (5) from the top center. The hot air generated by the hot air mechanism (2) enters the drying chamber (5) from the middle and flows upward along the upper inner wall of the drying chamber (5) to the top and then downward. The hot air comes into contact with the droplets sprayed by the spray mechanism (3), causing the water in the droplets to evaporate quickly and carrying the dried material into the separation mechanism (4). The air is discharged through the exhaust pipe, and the product remains in the separation mechanism (4). The upper part of the drying chamber (5) is ellipsoidal and the lower part is conical. The upper end of the drying chamber (5) has a downwardly protruding frustum-shaped feed section (7). The side of the feed section (7) smoothly transitions with the inner wall of the drying chamber (5), so that the upper cross section of the drying chamber (5) has two symmetrical parabolic shapes. The hot air mechanism (2) includes a hot air fan (13), a heater (14), an air distribution ring (15), and multiple hot air pipes (16). The air outlet of the hot air fan (13) is connected to the heater (14), the heater (14) is connected to the air distribution ring (15), and multiple hot air pipes (16) are connected to the air distribution ring (15). The multiple hot air pipes (16) are arranged in a ring array outside the drying chamber (5). Multiple hot air pipes (16) are connected to the middle of the drying chamber (5). The drying chamber (5) is provided with a guide plate (17). The guide plate (17) is an annular arc-shaped plate made of the same material as the microporous plate (8). The lower end of the guide plate (17) is fixedly connected to the inner wall of the drying chamber (5), and the middle part protrudes arc-shaped towards the center of the drying chamber (5). There is a gap between the upper end of the guide plate (17) and the inner wall of the drying chamber (5). An air collecting ring is formed between the guide plate (17) and the inner wall of the drying chamber (5). Hot air flows upward from the gap between the guide plate (17) and the inner wall of the drying chamber (5) and exits through the air collecting ring. The air temperature in the air collecting ring is 190℃~210℃, the nozzle (6) of the spray mechanism (3) rotates at 15000 rpm, the air temperature in the separation mechanism (4) is 85℃~95℃, and the material stays in the drying chamber (5) for 1 second~2 seconds.

2. The drying apparatus for producing trypsin according to claim 1, characterized in that, The nozzle (6) of the spraying mechanism (3) is located below the feed section (7) and above the intersection of the tangents at the lower end of the side of the feed section (7).

3. A drying apparatus for producing trypsin according to claim 1, characterized in that, The lower conical inner wall of the drying chamber (5) is provided with a microporous plate (8), and a ventilation cavity is formed between the microporous plate (8) and the lower conical inner wall of the drying chamber (5). A ventilation mechanism (9) for air circulation into the ventilation cavity is provided outside the drying mechanism (1).

4. A drying apparatus for producing trypsin according to claim 3, characterized in that, The ventilation mechanism (9) includes a ventilation fan (10) and a ventilation duct (11), and a heat exchanger (12) is provided between the ventilation duct (11) and the exhaust pipe of the separation mechanism (4).

5. A drying apparatus for producing trypsin according to claim 1, characterized in that, Multiple hot air ducts (16) are connected to the air collection ring along the radial direction of the air distribution ring (15).

6. A drying apparatus for producing trypsin according to claim 1, characterized in that, The drying mechanism (1) includes an outer shell (18) and an inner shell (19). The space enclosed by the inner wall of the inner shell (19) is a drying chamber (5). A heat insulation layer (20) is provided between the inner shell (19) and the outer shell (18). The heat insulation layer (20) is wrapped around the upper part of the inner shell (19), the outer air distribution ring, and the outer part of the hot air pipe (16).

7. A drying apparatus for producing trypsin according to claim 6, characterized in that, The outer shell (18) and the inner shell (19) are provided with corresponding transparent windows (21), and a channel is provided between the transparent windows (21) of the outer shell (18) and the inner shell (19). A light source with a light emission direction facing the central axis of the inner shell (19) is provided in the channel, and a controller is connected to the outer shell (18).

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