Dehumidification system for drying soft capsules
By designing a dehumidification system that includes a tray drying chamber, a bag-type primary filter section, primary and secondary refrigeration dehumidification sections, and an air reheating section, the problems of high energy consumption and short lifespan of rotary dehumidification systems have been solved, achieving low-energy consumption, long-life low humidity control and meeting the process requirements of soft capsule drying.
Patent Information
- Application Number
- CN202423275331.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Existing rotary dehumidification systems are energy-intensive, have short lifespans, and are greatly affected by external air conditions, making it difficult to meet the low humidity requirements for soft capsule drying.
The dehumidification system employs a tray drying chamber, a bag-type primary filter section, primary and secondary refrigeration dehumidification sections, an air reheat section, and a laminar flow section. Through the alternating use of dual refrigeration air conditioning systems and heat recovery technology, it ensures precise control of air humidity and temperature, reducing the impact of external conditions.
It achieves low energy consumption and long lifespan dehumidification, meets the low humidity requirements of soft capsule drying, and reduces manufacturing costs and operating expenses.
Smart Images
Figure CN223741110U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a low temperature low humidity drying dehumidification system, specifically to a soft capsule drying dehumidification system. BACKGROUND
[0002] Soft capsules are a kind of preparation that seals oil or non-water-soluble liquid or suspension, etc. in a capsule shell. Soft capsule preparation is mostly used for non-water-soluble, light-sensitive, unstable to heat and moisture, easily oxidized and volatile drugs, and its preparation process is complex, including sol, pill pressing, drying, pill selection, packaging and other processes. In the soft capsule preparation process, in order to ensure the molding and good drug properties of soft capsules, the process conditions must be strictly controlled. Improper drying conditions can cause problems such as adhesion and rupture of soft capsules, seriously affecting the quality of the product.
[0003] The soft capsule production workshop must maintain constant temperature and humidity. Generally, the temperature of the first drying room is required to be 17-20 ℃, and the relative humidity is 50%-70%. However, some materials sensitive to moisture require low moisture content. After the above-mentioned first drying, they need to be dried on a tray to meet the moisture requirements of soft capsules. The temperature of the tray drying room is required to be 22-25 ℃, and the relative humidity is ≤30%. The conventional purification workshop refrigeration system uses a large water chiller, and the outlet water temperature is 7-10 ℃. Under the condition of workshop temperature 22-25 ℃, the relative humidity is ≥45%. Especially in the summer, the ambient temperature and humidity are high. After dehumidification in the purification room, the relative humidity is generally still ≥55% under the condition of meeting the temperature requirement, which cannot meet the requirements of the tray drying room.
[0004] To meet this demand, the conventional solution is to use a rotary dehumidification unit. However, the conventional rotary dehumidification method has obvious shortcomings. First, the energy consumption is high, especially the energy consumption of rotary regeneration. Second, the rotary is in a state of relative motion, which can easily cause operation failure. Third, the service life of the rotary adsorbent is limited, usually 3-5 years. Finally, the dehumidification effect is greatly affected by external air conditions, which has gradually failed to meet the needs of today's process production. SUMMARY
[0005] The technical problem to be solved by the utility model is to provide a soft capsule drying and dehumidification system with low energy consumption, little influence of external air conditions and long service life, mainly suitable for soft capsules with low moisture load but low air humidity requirements.
[0006] In order to solve the above technical problems, the soft capsule drying and dehumidifying system, comprising a tray drying chamber, a fresh air bag primary filter section for allowing fresh air from outside to enter, a new return air mixing section connected with the fresh air bag primary filter section, a first-stage refrigeration dehumidifying section connected with the new return air mixing section, a second-stage refrigeration dehumidifying section connected with the first-stage refrigeration dehumidifying section, and an air reheating section connected with the second-stage refrigeration dehumidifying section, the air reheating section is connected with a bag medium-efficiency filter section through a fan section, the tray drying chamber has a laminar flow section composed of a supply air section and a return air section, the supply air section is connected with the bag medium-efficiency filter section through a high-efficiency filter, the return air section is respectively connected with a No. 1 return air outlet of the new return air mixing section and a No. 2 return air outlet of the bag medium-efficiency filter section, a No. 5 temperature and humidity transmitter for detecting the temperature and humidity of the return air of the tray drying chamber is arranged in the return air section, the first-stage refrigeration dehumidifying section has a No. 1 evaporator and a No. 2 evaporator alternately performing refrigeration and dehumidification, the air reheating section is provided with a heat recovery section and an electric heating section and can allow the air passing through the second-stage refrigeration dehumidifying section to firstly pass through the heat recovery section to be heated for the first time and then pass through the electric heating section to be heated to a required process temperature, the supply air section and the return air section form a tray space for accommodating trays and can allow the air output from the air reheating section to enter the bag medium-efficiency filter section and be mixed with the air entering the No. 2 return air outlet and then enter the high-efficiency filter to form stable and uniform drying air in the tray space.
[0007] The fresh air bag primary filter section comprises a primary filter box body, a bag primary filter arranged in the primary filter box body, a No. 1 air pressure transmitter arranged at the rear side of the bag primary filter and used for detecting the pressure difference before and after the bag primary filter, and a No. 1 temperature and humidity transmitter arranged at the rear side of the No. 1 air pressure transmitter and used for detecting the temperature and humidity of the entering fresh air.
[0008] The first-stage refrigeration dehumidifying section has a first-stage refrigeration dehumidifying box body, the No. 1 evaporator and the No. 2 evaporator are arranged in the first-stage refrigeration dehumidifying box body, the first-stage refrigeration dehumidifying box body further has an air reversing valve, and the No. 1 evaporator and the No. 2 evaporator are switched through the air reversing valve.
[0009] The second-stage refrigeration dehumidifying section comprises a second-stage refrigeration dehumidifying box body, a surface air cooler arranged in the second-stage refrigeration dehumidifying box body, a No. 2 temperature and humidity transmitter arranged at the front side of the surface air cooler and used for detecting the temperature and humidity of the air sent from the first-stage refrigeration dehumidifying section, a No. 3 temperature and humidity transmitter arranged at the rear side of the surface air cooler and used for detecting the temperature and humidity of the air passing through the surface air cooler, and a water chiller connected with the surface air cooler.
[0010] The air reheating section further comprises an air reheating box body, and the heat recovery section and the electric heating section are arranged in the air reheating box body.
[0011] The fan section comprises a fan box body and a fan arranged in the fan box body.
[0012] The medium-efficiency filtration section includes a medium-efficiency filter housing, a medium-efficiency filter installed inside the medium-efficiency filter housing, a second wind pressure transmitter located behind the medium-efficiency filter for detecting the air pressure difference before and after the medium-efficiency filter, and a fourth temperature and humidity transmitter located behind the second wind pressure transmitter for detecting the temperature and humidity of the air after dehumidification and temperature regulation. The electric heating section can determine its specific opening state based on the temperature detected by the fourth temperature and humidity transmitter.
[0013] The air supply section has a static pressure chamber and a No. 3 air pressure transmitter located in the static pressure chamber for detecting the air pressure difference before and after the high-efficiency filter. The static pressure chamber is isolated from the tray space by an air inlet equalization plate. The return air section has a return air chamber, and the No. 5 temperature and humidity transmitter is located in the return air chamber. The return air chamber is isolated from the tray space by a return air equalization plate.
[0014] The fan is a centrifugal fan.
[0015] With the above structure, the primary refrigeration and dehumidification section has two evaporators, No. 1 and No. 2, that alternately perform refrigeration and dehumidification, forming a dual refrigeration air conditioning system used in parallel. The secondary refrigeration and dehumidification section consists of a chiller unit, a surface cooler, etc. The air reheat section consists of a heat recovery section and an electric heating section. The heat in the heat recovery section comes from the heat recovery of the primary and secondary refrigeration and dehumidification sections. A tray drying room is also designed, consisting of a laminar flow section composed of a supply air section and a return air section, and a tray space formed between the supply air section and the return air section for holding trays. This separates the temperature and humidity processing, treating the first... Once the humidity reaches the required absolute moisture content, the processing temperature reaches the required process temperature. This process treats the fresh air or fresh return air to the required low temperature and low humidity, and then sends it to the tray drying room. This ensures constant temperature and relative humidity in each workshop to meet the needs of the production process. It is used for soft capsule drying processes with low moisture load and where most of the moisture has been removed in one drying cycle. It is particularly suitable for soft capsule production lines with low moisture load but low requirements for air humidity. Its structural design is reasonable, less affected by external air conditions, has a long service life, and its manufacturing cost and energy consumption are significantly lower than those of commonly used rotary dehumidifier systems. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the soft capsule drying and dehumidification system of this utility model;
[0017] Figure 2 for Figure 1 A magnified structural diagram at point A;
[0018] Figure 3 for Figure 1 A magnified structural diagram at point B. Detailed Implementation
[0019] The soft capsule drying and dehumidifying system is further explained in detail below in combination with the drawings and specific embodiments.
[0020] As shown in the figure, the soft capsule drying and dehumidifying system comprises a tray drying room 1, a fresh air bag primary filter section 2 for allowing fresh air from outside to enter, a new return air mixing section 3 connected with the fresh air bag primary filter section 2, a first-stage refrigeration dehumidifying section 4 connected with the new return air mixing section 3, a second-stage refrigeration dehumidifying section 5 connected with the first-stage refrigeration dehumidifying section 4, and an air reheating section 6 connected with the second-stage refrigeration dehumidifying section 5, wherein the air reheating section 6 is connected with a bag medium filter section 8 through a fan section 7, the fan section 7 comprises a fan box 7-1 and a fan 7-2 arranged in the fan box 7-1, and the fan 7-2 is preferably a high-pressure centrifugal fan; the tray drying room 1 has a laminar flow section composed of a supply air section 10 and a return air section 11, the supply air section 10 is connected with the bag medium filter section 8 through a high-efficiency filter 9, the return air section 11 is connected with a No. 1 return air outlet of the new return air mixing section 3 and a No. 2 return air outlet of the bag medium filter section 8 respectively, the new return air mixing section 3 mixes the part of return air from the tray drying room 1 with the fresh air preliminarily treated through the fresh air bag primary filter section 2, and sends the mixed air to the first-stage refrigeration dehumidifying section 4, a No. 5 temperature and humidity transmitter 12 is arranged in the return air section 11 for detecting the temperature and humidity of the return air of the tray drying room, the first-stage refrigeration dehumidifying section 4 comprises a first-stage refrigeration dehumidifying box 4-1, a No. 1 evaporator 13 and a No. 2 evaporator 14 arranged in the first-stage refrigeration dehumidifying box 4-1 and capable of alternately performing refrigeration and dehumidification, and an air reversing valve 4-2 arranged in the first-stage refrigeration dehumidifying box, the No. 1 evaporator 13 is connected with a No. 1 condenser 17, the No. 2 evaporator 14 is connected with a No. 2 condenser 18, the No. 1 evaporator 13 and the No. 2 evaporator 14 are switched through the air reversing valve 4-2, thereby forming a structure design of parallel use of a double refrigeration air conditioning system, and the two sets of refrigeration systems are alternately used, after the surface of one set of evaporator is frosted due to the too low air dew point temperature, the dehumidification work can be continuously performed after the air reversing valve is switched to the other set of evaporator; in specific work, the air mixed through the new return air mixing section 3 enters the No. 1 evaporator 13 to perform first-stage refrigeration and dehumidification through the air reversing valve 4-2, after a period of time, the surface of the No. 1 evaporator 13 is frosted due to the too low air dew point temperature, the system enters the defrosting process, at this time, the air mixed through the new return air mixing section enters the No. 2 evaporator 14 to perform first-stage refrigeration and dehumidification through the air reversing valve 4-2, and the cycle is repeated; the system structure avoids the short-time non-refrigeration and dehumidification of a single refrigeration air conditioning system due to defrosting, and ensures that refrigeration and dehumidification can be performed at all times; the air reheating section 6 comprises an air reheating box 6-1, a heat recovery section 15 and an electric heating section 16 arranged in the air reheating box, the heat of the heat recovery section comes from the heat recovery of the first-stage refrigeration dehumidifying section and the second-stage refrigeration dehumidifying section, thereby the air passing through the second-stage refrigeration dehumidifying section 5 enters the air reheating box 6-1 first, performs first-stage heating through the heat recovery section, reduces the energy consumption of heating, and then enters the electric heating section to heat the air to the required process temperature.The form of heat recovery is not limited, and can be any one of partial heat recovery, full heat recovery, or a combination of both, and is preferably full heat recovery; the tray space is formed between the air supply section 10 and the return air section 11 for accommodating the trays, and the air output from the air reheating section 6 can enter the bag-type medium-efficiency filtering section 8 while being mixed with the air entering the second return air inlet, and then enters the high-efficiency filter 9 to form stable and uniform drying air in the tray space.
[0021] Further, the fresh air bag-type primary filter section 2 comprises a primary filter box 2-1, a bag-type primary filter 2-2 arranged in the primary filter box, a first air pressure transmitter 2-3 arranged at the rear side of the bag-type primary filter for detecting the pressure difference before and after the bag-type primary filter, and a first temperature and humidity transmitter 2-4 arranged at the rear side of the first air pressure transmitter 2-3 for detecting the temperature and humidity of the incoming fresh air. After the external fresh air enters the primary filter box 2-1, it is first filtered by the bag-type primary filter 2-2 to filter out larger-sized impurities in the air. The first air pressure transmitter 2-3 detects the pressure difference before and after the bag-type primary filter 2-2. The conventional primary filter is usually replaced by time method, such as once every half a year or once every year. However, the use frequency of the workshop varies, and the replacement is often performed before the service life expires or after the service life expires, and the overall air volume is low but still not replaced. The present application can more accurately monitor the service life of the bag-type primary filter by monitoring the pressure difference before and after the primary filter. The secondary refrigeration dehumidification section 5 comprises a secondary refrigeration dehumidification box 5-1, a surface air cooler 5-2 arranged in the secondary refrigeration dehumidification box, a second temperature and humidity transmitter 5-3 arranged at the front side of the surface air cooler for detecting the temperature and humidity of the air sent by the primary refrigeration dehumidification section, a third temperature and humidity transmitter 5-4 arranged at the rear side of the surface air cooler for detecting the temperature and humidity of the air passing through the surface air cooler, and a water chiller unit 5-5 connected with the surface air cooler. The conventional water chiller unit has an outlet water temperature accuracy of ±2℃ to ±3℃, which cannot meet the requirement of secondary dehumidification. In the present embodiment, in order to meet the low dew point requirement, an antifreeze is added to the refrigeration water of the water chiller unit. The antifreeze can be any one of sodium chloride antifreeze, methanol antifreeze, ethanol antifreeze, ethylene glycol antifreeze, propylene glycol antifreeze, glycerol antifreeze, etc., and is preferably ethylene glycol antifreeze. In order to avoid frosting on the surface of the surface air cooler, the refrigeration water temperature should not be lower than 0℃, and the outlet water temperature of the water chiller unit is preferably 0-1℃, which can perform the second dehumidification work and provide a lower dew point temperature.
[0022] Further, the air supply section 10 has a static pressure chamber 10-1 and a third air pressure transmitter 10-2 in the static pressure chamber for detecting the air pressure difference before and after the high-efficiency filter 9. The static pressure chamber is separated from the tray space by an air inlet flow uniformity orifice plate 10-3. The air return section 11 has an air return chamber 11-1, and a fifth temperature and humidity transmitter 12 is located in the air return chamber. The air return chamber is separated from the tray space by an air return flow uniformity orifice plate 11-3. The air inlet flow uniformity orifice plate 10-3 and the air return flow uniformity orifice plate 11-3 are stainless steel punched plates. The opening rate of the air inlet flow uniformity orifice plate 10-3 is not less than 30%, and the hole diameter is 2.5 mm. Smaller hole diameter and lower opening rate ensure more uniform air inlet. The opening rate of the air return flow uniformity orifice plate 11-3 is 50%, and the hole diameter is 6 mm. Larger hole diameter and opening rate can reduce air resistance and energy consumption as much as possible while ensuring uniform airflow organization. Traditional high-efficiency filters are usually replaced using the time method, such as once every six months or once a year. However, the use frequency of workshops varies, and it often happens that the filters are replaced before the service life expires or the service life has already expired, but the overall air volume is already low and the filters have not been replaced. By monitoring the pressure difference before and after the high-efficiency filter, the service life of the filter can be more accurately monitored. For soft capsules that have been dried once and have most of the moisture removed, uneven drying of the material in different areas often occurs during the second drying process. This is because the airflow organization in the room is not uniform, with high wind speed in some areas and low wind speed in other areas. The laminar flow section can provide constant wind speed and uniform airflow organization to solve the above-mentioned problems.
[0023] Further, the medium-efficiency filter section 8 includes a medium-efficiency filter box 8-1, a medium-efficiency filter 8-2 arranged in the medium-efficiency filter box, a second air pressure transmitter 8-3 located at the rear side of the medium-efficiency filter for detecting the air pressure difference before and after the medium-efficiency filter, and a fourth temperature and humidity transmitter 8-4 located at the rear side of the second air pressure transmitter for detecting the temperature and humidity of the air after dehumidification and temperature adjustment. Traditional medium-efficiency filters are usually replaced using the time method, such as once every six months or once a year. However, the use frequency of workshops varies, and it often happens that the filters are replaced before the service life expires or the service life has already expired, but the overall air volume is already low and the filters have not been replaced. By monitoring the pressure difference before and after the medium-efficiency filter, the service life of the medium-efficiency filter can be more accurately monitored. The fourth temperature and humidity transmitter 8-4 detects the temperature and humidity of the air after dehumidification and temperature adjustment to determine whether it meets the requirements of the production process. At the same time, the electric heating section can determine its specific opening state according to the temperature detected by the fourth temperature and humidity transmitter. Through the pressure difference before and after the first, second, and third air pressure transmitters, the service life of the filters can be accurately monitored.
[0024] The working principle is as follows:
[0025] Referring to Figure 1 The soft capsule drying dehumidification system of the embodiment is used for soft capsules that have been dehumidified once, have low moisture load, and have low requirements for air humidity. The specific processing process is as follows:
[0026] The external fresh air first enters the fresh air bag primary filter section 2, is subjected to primary filtration through the bag primary filter 2-2, and filters out impurities in the air with a large size. The first air pressure transmitter 2-3 detects the pressure difference before and after the bag primary filter. If the pressure difference is too large, it means that the air vent of the bag primary filter 2-2 is mostly blocked by impurities in the external air, and the service life has expired, so it needs to be replaced. If the pressure difference is normal, no treatment is needed.
[0027] The fresh air preliminarily processed through the fresh air bag primary filter section is mixed with the return air B (first return air outlet) from the tray drying chamber 1 in the new return air mixing section 3, and is sent to the first refrigeration dehumidification section 4. The amount of air at the return air B depends on the temperature and humidity of the return air of the tray drying chamber 1 detected by the fifth temperature and humidity transmitter 12 of the laminar flow section. If the temperature and humidity of the return air of the tray drying chamber 1 meet the process requirements, it means that most of the air in the tray drying chamber 1 does not need to be dehumidified, so the amount of air at the return air B is low, and more return air enters the medium-efficiency filter section 8 from the return air A (second return air outlet) and enters the high-efficiency filter 9. If the temperature and humidity of the return air of the tray drying chamber 1 deviate greatly from the process requirements, the amount of air at the return air B is high, and less return air enters from the return air B.
[0028] The air mixed in the new return air mixing section enters the first evaporator 13 for first-stage refrigeration dehumidification through the air reversing valve 4-2. After a period of time, frost will form on the surface of the first evaporator 13 due to the low dew point temperature of the air, and the system enters the defrosting process. At this time, the air mixed in the new return air mixing section enters the second evaporator 14 for first-stage refrigeration dehumidification through the air reversing valve 4-2. This cycle is repeated. This system structure avoids the short-term non-refrigeration dehumidification caused by defrosting in a single refrigeration air conditioning system, ensuring that refrigeration dehumidification can be performed at all times. After this processing section, the dew point of the air is generally between 7°C and 10°C. The first temperature and humidity transmitter 2-4 and the second temperature and humidity transmitter 5-3 are used to determine whether the first refrigeration dehumidification section 4 is working normally, and faults can be timely eliminated.
[0029] The air processed by the first refrigeration dehumidification section 4 enters the second refrigeration dehumidification section 5. The water chiller 5-5 adds ethylene glycol antifreeze to the cold water. The outlet water temperature of the water chiller 5-5, that is, the inlet water temperature of the surface cooler 5-2, is 0-1°C. After the air passes through the surface cooler 5-2, the dew point of the air is 0-1°C.
[0030] The cold dry air treated by the secondary refrigeration dehumidification section 5 enters the air reheating section 6 to be heated, and the heat recovery section is heated by the heat recovery of the primary refrigeration dehumidification section and the secondary refrigeration dehumidification section. After the air treated by the secondary refrigeration dehumidification enters the air reheating box 6-1, the air is first heated in the heat recovery section 15 to reduce the energy consumption required for heating, and then the air is heated to the required process temperature in the electric heating section 16. The electric heating section 16 comprises a plurality of identical electric heating modules, and whether all the heating modules or part of the heating modules are started depends on the temperature detected by the fourth temperature and humidity transmitter 8-4. If the temperature feedback by the fourth temperature and humidity transmitter 8-4 is too high, the electric heating section 16 starts a small part of the heating modules, and if the temperature feedback by the fourth temperature and humidity transmitter 8-4 is too low, the electric heating section 16 starts most or even all of the heating modules.
[0031] The air treated by the above process enters the medium efficiency filter section 8, and after the air passes through the medium efficiency filter 8-2, the air is mixed with the return air A and enters the high efficiency filter 9. The second air pressure transmitter 8-3 detects the pressure difference before and after the medium efficiency filter 8-2, and if the pressure difference is too large, it means that the air holes of the medium efficiency filter 8-2 are mostly blocked by impurities in the air, and the service life has expired and needs to be replaced. If the pressure difference is normal, it is not treated. The third air pressure transmitter 10-2 detects the pressure difference before and after the high efficiency filter 9, and as described above, if the pressure difference is too large, it means that the air holes of the high efficiency filter 9 are mostly blocked by impurities in the air, and the service life has expired and needs to be replaced. If the pressure difference is normal, it is not treated.
[0032] The air out of the high efficiency filter 9 has been treated by temperature adjustment, humidity adjustment and filtration, and meets the production process requirements. The temperature is generally 22-25℃, and the relative humidity is ≤30%. The air enters the laminar flow section 10, and the airflow is first stabilized in the static pressure chamber 10-1, and then passes through the air inlet uniform flow orifice plate 10-3 and the return air uniform flow orifice plate 11-3 to return to the return air chamber 11-1. A stable and uniform drying air is formed in the tray drying chamber 1, the drying air blows at a constant speed through the surface of the material in the tray, and the residual moisture in the soft capsule shell is removed, so that the soft capsule with low moisture content is finally realized.
[0033] Of course, the above description is not a limitation of the present application, and the present application is not limited to the above examples. Changes, modifications, additions or replacements made by those skilled in the art within the scope of the present application should also be within the scope of protection of the present application.
Claims
1. A dehumidification system for drying soft capsules, characterized by: The tray drying room (1), the fresh air bag primary filter section (2) for making the outside fresh air enter, the new return air mixing section (3) connected with the fresh air bag primary filter section (2), the first stage refrigeration dehumidification section (4) connected with the new return air mixing section (3), the second stage refrigeration dehumidification section (5) connected with the first stage refrigeration dehumidification section (4) and the air reheating section (6) connected with the second stage refrigeration dehumidification section (5), the air reheating section (6) is connected with the bag medium efficiency filter section (8) through the fan section (7), the tray drying room (1) has the laminar section formed by the air supply section (10) and the return air section (11), the air supply section (10) is connected with the bag medium efficiency filter section (8) through the high efficiency filter (9), the return air section (11) is connected with the new return air mixing section (3) on the first return air port and the bag medium efficiency filter section (8) on the second return air port respectively, the return air section (11) is provided with the fifth temperature and humidity transmitter (12) for detecting the temperature and humidity of the tray drying room return air, the first stage refrigeration dehumidification section (4) has the first evaporator (13) and the second evaporator (14) for alternately carrying out refrigeration dehumidification work, the air reheating section (6) is provided with the heat recovery section (15) and the electric heating section (16) and can make the air passing through the second stage refrigeration dehumidification section (5) first pass through the heat recovery section to be heated for the first time, then pass through the electric heating section to heat the air temperature to the required process temperature, the air supply section (10) and the return air section (11) form the tray space for containing the tray and can make the air output from the air reheating section (6) enter the bag medium efficiency filter section (8) while mixing with the air entering the second return air port and then enter the high efficiency filter (9) to enter the tray space to form stable and uniform drying air.
2. The dehumidification system for drying soft capsules according to claim 1, characterized in that: The fresh air bag primary filter section (2) includes a primary filter box (2-1), a bag primary filter (2-2) arranged in the primary filter box, a first air pressure transmitter (2-3) arranged at the rear side of the bag primary filter for detecting the pressure difference before and after the bag primary filter, and a first temperature and humidity transmitter (2-4) arranged at the rear side of the first air pressure transmitter (2-3) for detecting the temperature and humidity of the entering fresh air.
3. The dehumidification system for drying soft capsules according to claim 1 or 2, characterized in that: The first stage refrigeration dehumidification section (4) has a first stage refrigeration dehumidification box (4-1), the first evaporator (13) and the second evaporator (14) are arranged in the first stage refrigeration dehumidification box, and the first stage refrigeration dehumidification box further has an air reversing valve (4-2), the first evaporator (13) and the second evaporator (14) are switched through the air reversing valve (4-2).
4. The dehumidification system for drying soft capsules according to claim 3, characterized in that: The second stage refrigeration dehumidification section (5) includes a second stage refrigeration dehumidification box (5-1), a surface cooler (5-2) arranged in the second stage refrigeration dehumidification box, a second temperature and humidity transmitter (5-3) arranged at the front side of the surface cooler for detecting the temperature and humidity of the air sent by the first stage refrigeration dehumidification section, a third temperature and humidity transmitter (5-4) arranged at the rear side of the surface cooler for detecting the temperature and humidity of the air passing through the surface cooler, and a water chiller (5-5) connected with the surface cooler.
5. The dehumidification system for drying soft capsules according to claim 1, 2 or 4, characterized in that: The air reheating section (6) further comprises an air reheating box (6-1), and the heat recovery section (15) and the electric heating section (16) are located in the air reheating box.
6. The dehumidification system for drying soft capsules according to claim 5, characterized in that: The fan section (7) comprises a fan box (7-1) and a fan (7-2) arranged in the fan box.
7. The dehumidification system for drying soft capsules according to claim 1, 2, 4 or 6, characterized in that: The medium-effect filtering section (8) comprises a medium-effect filtering box (8-1), a medium-effect filter (8-2) arranged in the medium-effect filtering box, a second air pressure transmitter (8-3) located at the rear side of the medium-effect filter and used for detecting the air pressure difference before and after the medium-effect filter, and a fourth temperature and humidity transmitter (8-4) located at the rear side of the second air pressure transmitter and used for detecting the temperature and humidity of the air after dehumidification and temperature adjustment, and the electric heating section can determine the specific opening state according to the temperature detected by the fourth temperature and humidity transmitter.
8. The dehumidification system for drying soft capsules according to claim 7, characterized in that: The air supply section (10) has a static pressure chamber (10-1) and a third air pressure transmitter (10-2) located in the static pressure chamber and used for detecting the air pressure difference before and after the high-effect filter (9), and the static pressure chamber is isolated from the tray space through an air inlet flow uniform hole plate (10-3); the air return section (11) has an air return chamber (11-1), and the fifth temperature and humidity transmitter (12) is located in the air return chamber, and the air return chamber is isolated from the tray space through an air return flow uniform hole plate (11-3).
9. The soft capsule drying dehumidification system according to claim 6, characterized in that: The fan (7-2) is a centrifugal fan.