Automatic granulation process of boiling granulation dryer

Abstract

The invention discloses an automatic granulation process of a boiling granulation dryer. The automatic granulation process comprises the following steps: S1, building a granulation system; s2, when a fluidized bed is preheated to the feeding temperature, powder is fed into the fluidized bed, and then the powder is heated to the set material temperature; s3, starting automatic segmented granulation; s4, the materials are dried for t5 minutes in a delayed mode; s5, starting material coloring; s6, drying the materials for t7 minutes; and S7, the air inlet temperature is reduced, dry cold air is conveyed into the fluidized bed, the material temperature is reduced, and when the material temperature is smaller than or equal to the discharging temperature value, shutdown is conducted, and the materials are output. According to the invention, the traceability and reducibility of batch products are ensured, and the defects of manual operation are overcome; in the granulating process, the material bed collapse is avoided, and the fullness and uniformity of the medicine component of each granule are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of medicine granulation, in particular to an automatic granulation process of a boiling granulation dryer. Background Art

[0002] Traditional fluidized bed drying granulators require manual control based on operator experience. Throughout this manual granulation process, operators must constantly monitor material temperature, air volume, spray volume, atomization gas level, particle size variations, and the boiling state of the material. These manual operations result in high labor costs. Operators vary in their granulation experience, leading to varying degrees of control over the granulation process. This makes it difficult to guarantee product quality and consistency across batches. Even if an operator can accurately control product quality based on their experience, this accuracy is limited to that individual and difficult for others to replicate, hindering the mass production of high-quality finished products. Furthermore, manual recording of the granulation process can lead to significant errors, making it difficult to ensure authenticity and traceability. Summary of the Invention

[0003] In order to solve the technical problem of poor consistency of granulation products produced by manually controlled boiling granulation dryer, the present invention provides an automatic granulation process of boiling granulation dryer.

[0004] The technical solution is as follows:

[0005] An automatic granulation process of a boiling granulation dryer comprises the following steps:

[0006] S1. Build a granulation system: The granulation system includes a fluidized bed, in which a base, a fluidized bed, a granulation chamber, and a collection chamber are sequentially arranged from bottom to top;

[0007] The base is connected to an air inlet system, which supplies hot air for temperature control and boiling to the fluidized bed; the granulation chamber is connected to an atomization liquid supply system;

[0008] S2, when the fluidized bed is preheated to the feed temperature, the powder material is fed into the fluidized bed and then heated to the set material temperature;

[0009] S3, start automatic segmented granulation, the automatic segmented granulation is divided into four stages;

[0010] S31, first automatic granulation stage: the atomizing liquid supply system delivers the extract into the fluidized bed, controls the material temperature to be maintained above the granulation temperature, and stops delivering the extract when the extract spraying amount reaches the extract spraying amount of the first stage, and dries the material for t1 minute;

[0011] S32, second stage automatic granulation: the atomizing liquid supply system conveys the extract into the fluidized bed, controls the material temperature to be maintained above the granulation temperature, and stops conveying the extract when the extract spraying amount reaches the second stage extract spraying amount, and dries the material for t2 minutes;

[0012] S33, third stage automatic granulation: the atomizing liquid supply system conveys the extract into the fluidized bed, controls the material temperature to be maintained above the granulation temperature, and stops conveying the extract when the extract spraying amount reaches the third stage extract spraying amount, and dries the material for t3 minutes;

[0013] S34, fourth stage automatic granulation: the atomizing liquid supply system conveys the extract into the fluidized bed, controls the material temperature to be maintained above the granulation temperature, and stops conveying the extract when the extract spraying amount reaches the fourth stage extract spraying amount, and dries the material for t4 minutes;

[0014] S4, delay drying of materials for t5 minutes;

[0015] S5. Start coloring the material: the atomizing liquid supply system delivers the extract into the fluidized bed, controls the material temperature to be maintained within the granulation temperature range, and when the cumulative extract spraying amount reaches the total extract spraying amount, delays the delivery of the extract for t6 minutes;

[0016] S6, drying the material for t7 minutes;

[0017] S7. Lower the inlet air temperature and deliver dry cold air into the fluidized bed to lower the material temperature. When the material temperature is less than or equal to the discharge temperature, stop the machine and discharge the material.

[0018] Further description, in S1, the base is connected to the air intake system through an air intake pipe, the air intake pipe is provided with an air intake temperature sensor and an air intake volume regulating valve, the air intake system is provided with a surface cooler and a heat exchanger, the surface cooler is installed with a condensation regulating valve, and the heat exchanger is installed with a steam regulating valve; a material temperature sensor is provided in the fluidized bed; a top spray is provided in the granulation chamber, and the top spray is connected to the atomizing liquid supply system through a liquid supply pipe, the liquid supply pipe is provided with an extract flow sensor, and the atomizing liquid supply system is provided with an electric heater and an extract temperature sensor; the capture chamber is connected to the main fan through an air outlet pipe;

[0019] The material temperature sensor, extract temperature sensor, extract flow sensor, and air inlet temperature sensor are respectively connected to the first input terminal, the second input terminal, the third input terminal, and the fourth input terminal of the PLC; the main fan, top spray, electric heating, air inlet volume regulating valve, condensation regulating valve, and steam regulating valve are respectively connected to the first control terminal, the second control terminal, the third control terminal, the fourth control terminal, the fifth control terminal, and the sixth control terminal of the PLC;

[0020] The material temperature sensor can detect the material temperature in real time and send the material temperature to the PLC through the first input end; the extract temperature sensor can detect the extract temperature in the atomizing liquid supply system in real time and send the extract temperature to the PLC through the second input end; the extract flow sensor can detect the extract flow in the liquid supply pipe in real time and send the extract flow to the PLC through the third input end; the air inlet temperature sensor can detect the air outlet temperature of the air inlet system in real time and send the air outlet temperature of the air inlet system to the PLC through the fourth input end.

[0021] The PLC can generate different control signals according to the material temperature, extract temperature, extract flow rate, and air outlet temperature of the air inlet system, and control the working status of the main fan, top spray, electric heating, air inlet volume regulating valve, condensation regulating valve, and steam regulating valve through the corresponding control end.

[0022] With the above structure, the PID operation program in the PLC can automatically control each device after comprehensive operation based on the data collected by each sensor, and generate a data curve that can be repeatedly called and consulted, clarifying the execution standards of all granulation steps, standardizing the granulation process, ensuring the traceability and reproducibility of batch products, and overcoming the shortcomings of manual operation;

[0023] Further describing, in S2, the PLC controls the opening of the air inlet regulating valve, the condensation regulating valve and the steam regulating valve through the fourth control end, the fifth control end and the sixth control end respectively, the surface cooler and the heat exchanger dehumidify and heat the air, and the treated dry hot air is sent into the fluidized bed through the air inlet pipe, thereby preheating the fluidized bed, and automatically feeds when the temperature in the fluidized bed reaches the feed temperature; after the feeding is completed, the PLC controls the main fan to start through the first control end, and the main fan operates at the initial frequency, sucking the material into boiling motion in the fluidized bed and the granulation chamber, and heating the material to the set material temperature through the dry hot air;

[0024] The feed temperature range is 50-60°C, and the material setting temperature is 40-45°C.

[0025] Preheating the fluidized bed to around 55°C can not only ensure the dryness inside the fluidized bed, but also prevent the powder from agglomerating due to low temperature after entering the fluidized bed. Setting the material temperature to around 40°C can, to a certain extent, prevent the powder from agglomerating due to excessive humidity and low temperature after spraying the extract, while also ensuring the efficacy of the powder after contact and mixing with the extract.

[0026] Further describing, in S31, the PLC controls the top sprayer to spray the extract at a first uniform speed through the second control terminal, and the extract is fully contacted and mixed with the boiling material. When the amount of the extract sprayed reaches the amount of the extract sprayed in the first stage, the top sprayer stops spraying the extract;

[0027] In S32, the PLC controls the top sprayer to spray the extract at a first uniform speed through the second control terminal. The extract is fully contacted and mixed with the boiling material. When the amount of the extract sprayed reaches the amount of the extract sprayed in the second stage, the top sprayer stops spraying the extract.

[0028] In S33, the PLC controls the top sprayer to spray the extract at a first uniform speed through the second control terminal. The extract is fully contacted and mixed with the boiling material. When the amount of the extract sprayed reaches the amount of the extract sprayed in the third stage, the top sprayer stops spraying the extract.

[0029] In S34, the PLC controls the top sprayer to spray the extract at a first uniform speed through the second control terminal. The extract is fully contacted and mixed with the boiling material. When the amount of the extract sprayed reaches the amount of the extract sprayed in the fourth stage, the top sprayer stops spraying the extract.

[0030] In S31 to S34, the extract spraying amount in the first stage, the extract spraying amount in the second stage, the extract spraying amount in the third stage, and the extract spraying amount in the fourth stage decrease in sequence; the PLC also increases the operating frequency of the main fan through the first control terminal, and the operating frequency of the main fan increases with the increase of the cumulative extract spraying amount, and remains consistent with the main fan operating frequency corresponding to the cumulative extract spraying amount; when the cumulative extract spraying amount reaches the sum of the extract spraying amount in the first stage, the extract spraying amount in the second stage, the extract spraying amount in the third stage, and the extract spraying amount in the fourth stage, the operating frequency of the main fan reaches a full frequency of 50HZ;

[0031] The values ​​of t1, t2, t3 and t4 are all in the range of 2 to 5 minutes.

[0032] During the granulation process, the temperature of the extract is lower than the material temperature. As the amount of sprayed extract increases, the material temperature will gradually decrease and the material humidity will gradually increase, increasing the risk of uneven sticking and bed collapse. Before the cumulative amount of liquid supply reaches the full-frequency value, the granulation process is divided into four stages. During these four stages, the amount of sprayed slurry gradually decreases, and the material temperature decreases gradually. The above set values ​​are in line with the objective law of mixed granulation of materials and traditional Chinese medicine extracts during the granulation process. At the same time, the frequency of the main fan increases with the increase of the cumulative liquid supply to ensure that the material is stably in a fluidized boiling state. Granulation by the above method can, firstly, avoid bed collapse caused by excessive spraying of slurry and excessive wetting of the material, and secondly, ensure the fullness and uniformity of the drug content of each particle.

[0033] Further description, in S4, the main fan maintains full frequency 50 Hz operation, and the value of t5 is 2 minutes.

[0034] Further describing, in S5, the PLC controls the top sprayer to spray the extract at a second uniform speed through the second control terminal, and the extract is fully contacted and mixed with the boiling material. When the cumulative extract spraying amount reaches the total extract spraying amount, the top sprayer delays spraying the extract for t6 minutes;

[0035] The main fan maintains full frequency 50 Hz operation, and the value of t6 is 2 minutes.

[0036] Further described, the first speed is greater than the second speed.

[0037] Further description, in S3 and S5, when the material temperature is lower than the granulation temperature but higher than the blowing temperature, the PLC controls the top spray to be closed through the second control terminal, suspends the liquid supply for spraying the extract, and performs material temperature recovery. When the material temperature is higher than or equal to the feeding temperature, the PLC controls the top spray to be opened through the second control terminal to resume the liquid supply.

[0038] When the material temperature is lower than the blasting temperature, the PLC controls the top spray to be closed through the second control terminal, suspends the liquid supply, performs the blasting movement, and returns the material to the original temperature. When the material temperature is greater than or equal to the feeding temperature and the blasting movement is completed, the PLC controls the top spray to be opened through the second control terminal and resumes the liquid supply.

[0039] The granulation temperature is 34-37°C, and the blowing temperature is 28-34°C.

[0040] When the material temperature is below 37°C, the material is likely to have slightly agglomerated. At this time, stop spraying the extract and perform drying and temperature raising. This can quickly reduce the material moisture, increase the material temperature, and promote the dispersion of the material after drying. This prevents the material from continuing to agglomerate and collapse, which is beneficial to the boiling of the material, ensuring the fullness, uniformity, and efficacy of the finished granules, and improving the quality of the output product. When the material temperature is below 34°C, the material is likely to have seriously agglomerated. At this time, stop spraying the extract and use the main fan and air intake system to cooperate in the blowing movement. The impact force will disperse the agglomerated material, and dry and temperature raising can effectively disperse the material, reduce the material moisture, and increase the material temperature, preventing the material from continuing to agglomerate and collapse, which is beneficial to the boiling of the material, ensuring the fullness, uniformity, and efficacy of the finished granules, improving the success rate of the output product and reducing production costs.

[0041] Further description, in S6, the main fan maintains full frequency 50 Hz operation, and the value of t7 is 2 to 5 minutes.

[0042] Further description, in S7, the PLC controls the steam regulating valve through the sixth control end to close the heat exchanger, stop heating the air, and send dry cold air into the fluidized bed through the air inlet pipe to cool the material. The PLC makes a discharge judgment every t8 minutes. When the material temperature is less than or equal to the discharge temperature, the machine stops and the material is discharged. When the material temperature is less than or greater than the discharge temperature value, the material continues to be cooled. The main fan maintains full-frequency 50Hz operation, the t8 value is 2 minutes, and the discharge temperature is room temperature.

[0043] The finished granules are cooled to room temperature before being output from the fluidized bed. Appropriate temperature control and dryness can effectively prevent the finished granules from agglomerating when they are cooled after being output from the fluidized bed, thereby extending the shelf life of the medicine.

[0044] Beneficial effects: In an automatic granulation process of a boiling granulation dryer adopting the above technical solution, the sensor collects data and transmits it to the controller PLC. The controller PLC automatically controls each control point and generates a data curve, so that the granulation data can be repeatedly called and consulted, ensuring the traceability and reproducibility of batch products, and overcoming the shortcomings of manual operation; by spraying and drying, the cycle is repeated 4 times, which extends the spraying time of the slurry, and gradually mixes the slurry between the materials. The frequency of the main fan increases with the increase of the cumulative liquid supply, which can avoid bed collapse caused by excessive wetting of the material due to excessive spraying of slurry, ensure the fullness and uniformity of the drug content of each particle, and improve the quality of the output product. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a granulation flow chart;

[0046] Figure 2 It is a structural diagram of the granulation system;

[0047] Figure 3 This is the connection diagram between PLC and granulation system;

[0048] Figure 4 It is the temperature data graph of the material in the automatic program;

[0049] Figure 5 This is a data chart of the total amount of liquid supplied by the automatic program. DETAILED DESCRIPTION

[0050] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0051] like Figure 1-Figure 5 As shown, an automatic granulation process of a boiling granulation dryer mainly includes the following steps:

[0052] S1. Build a granulation system: The granulation system includes a fluidized bed 1, in which a base 1-1, a fluidized bed 1-2, a granulation chamber 1-3 and a collection chamber 1-4 are sequentially arranged from bottom to top;

[0053] The base 1-1 is connected to the air intake system 5 through an air intake pipe 4, and the air intake pipe 4 is provided with an air intake temperature sensor 4-1 and an air intake volume regulating valve 4-2;

[0054] The air inlet system 5 is provided with a surface cooler 5-1 and a heat exchanger 5-2. The surface cooler 5-1 is equipped with a condensation regulating valve 5-3, which is connected to the fifth control terminal of the PLC. The heat exchanger 5-2 is equipped with a steam regulating valve 5-4, which is connected to the sixth control terminal of the PLC. The air inlet system 5 supplies hot air for temperature control and boiling to the fluidized bed 1.

[0055] The fluidized bed 1-2 is provided with a material temperature sensor 1-5; the granulation chamber 1-3 is provided with a top spray 1-6, which is connected to the atomizing liquid supply system 3 through a liquid supply pipe 2, and the atomizing liquid supply system 3 is provided with an electric heater 3-1 and an extract temperature sensor 3-2; the liquid supply pipe 2 is provided with an extract flow sensor 2-1; the collection chamber 1-4 is connected to the main fan 7 through an air outlet pipe 6;

[0056] The material temperature sensor 1-5, the extract temperature sensor 3-2, the extract flow sensor 2-1, and the air inlet temperature sensor 4-1 are respectively connected to the first input terminal, the second input terminal, the third input terminal, and the fourth input terminal of the PLC; the main fan 7, the top spray 1-6, the electric heater 3-1, and the air inlet volume regulating valve 4-2 are respectively connected to the first control terminal, the second control terminal, the third control terminal, and the fourth control terminal of the PLC;

[0057] The material temperature sensor 1-5 can detect the material temperature in real time and send the material temperature to the PLC through the first input end; the extract temperature sensor 3-2 can detect the extract temperature in the atomizing liquid supply system 3 in real time and send the extract temperature to the PLC through the second input end; the extract flow sensor 2-1 can detect the extract flow in the liquid supply pipe 2 in real time and send the extract flow to the PLC through the third input end; the air inlet temperature sensor 4-1 can detect the air outlet temperature of the air inlet system in real time and send the air outlet temperature of the air inlet system to the PLC through the fourth input end;

[0058] The PLC can generate different control signals according to the material temperature, extract temperature, extract flow rate, and air outlet temperature of the air inlet system, and control the working status of the main fan 7, top spray 1-6, electric heating 3-1, air inlet volume regulating valve 4-2, condensation regulating valve 5-3, and steam regulating valve 5-4 through the corresponding control end.

[0059] S2, when the fluidized bed 1-2 is preheated to 55°C, the powder is fed into the fluidized bed 1-2 and then heated to 40°C;

[0060] The PLC controls the opening of the air inlet regulating valve 4-2, the condensation regulating valve 5-3, and the steam regulating valve 5-4 through the fourth control terminal, the fifth control terminal, and the sixth control terminal, respectively. The surface cooler 5-1 and the heat exchanger 5-2 dehumidify and heat the air, and the treated dry hot air is sent into the fluidized bed 1-2 through the air inlet pipe 4, thereby preheating the fluidized bed 1-2.

[0061] After the feeding is completed, the PLC controls the main fan 7 and the electric heater 3-1 to start through the first control terminal and the third control terminal respectively. The main fan 7 runs at the initial frequency to suck the material into the fluidized bed 1-2 and the granulation chamber 1-3 to cause boiling motion.

[0062] S3, start automatic segmented granulation, the automatic segmented granulation is divided into four stages;

[0063] S31, first stage automatic granulation: the PLC controls the top spraying units 1-6 via the second control terminal to spray the extract at a first uniform speed, so that the extract is fully contacted and mixed with the boiling material. When the amount of extract sprayed reaches the amount of extract sprayed in the first stage, the top spraying units 1-6 stop spraying the extract; and the material is dried for 2 minutes;

[0064] S32, second stage automatic granulation: the PLC controls the top spraying units 1-6 to spray the extract at a uniform speed at a first speed through the second control terminal. The extract is fully contacted and mixed with the boiling material. When the amount of extract sprayed reaches the amount of extract sprayed in the second stage, the top spraying units 1-6 stop spraying the extract. The material is then dried for 2 minutes.

[0065] S33, third stage automatic granulation: the PLC controls the top spraying units 1-6 to spray the extract at a first uniform speed through the second control terminal. The extract is fully contacted and mixed with the boiling material. When the amount of extract sprayed reaches the amount of extract sprayed in the third stage, the top spraying units 1-6 stop spraying the extract. The material is then dried for 5 minutes.

[0066] S34, fourth stage automatic granulation: the PLC controls the top spraying units 1-6 to spray the extract at a first uniform speed through the second control terminal. The extract is fully contacted and mixed with the boiling material. When the amount of extract sprayed reaches the amount of extract sprayed in the fourth stage, the top spraying units 1-6 stop spraying the extract. The material is then dried for 2 minutes.

[0067] In S31 to S34, the extract spraying amount of the first stage, the extract spraying amount of the second stage, the extract spraying amount of the third stage, and the extract spraying amount of the fourth stage decrease in sequence; the PLC also increases the operating frequency of the main fan 7 through the first control end, and the operating frequency of the main fan 7 increases with the increase of the cumulative extract spraying amount, and remains consistent with the operating frequency of the main fan 7 corresponding to the cumulative extract spraying amount; when the cumulative extract spraying amount reaches the sum of the extract spraying amount of the first stage, the extract spraying amount of the second stage, the extract spraying amount of the third stage, and the extract spraying amount of the fourth stage, the operating frequency of the main fan 7 reaches a full frequency of 50HZ.

[0068] S4, the main fan 7 keeps running at full frequency 50Hz, and delays drying the material for 2 minutes;

[0069] S5. Start coloring the material: The PLC controls the top sprays 1-6 to spray the extract at a second uniform speed through the second control terminal. The extract is fully contacted and mixed with the boiling material. When the cumulative amount of extract sprayed reaches the total amount of extract sprayed, the top sprays 1-6 delay spraying the extract for 2 minutes, and the main fan 7 maintains full frequency 50Hz operation.

[0070] S6. The main fan 7 maintains full frequency 50 Hz operation and dries the material for 5 minutes.

[0071] S7, the PLC controls the steam regulating valve 5-4 through the sixth control terminal to close the heat exchanger 5-2, stop heating the air, and send dry cold air into the fluidized bed 1-2 through the air inlet pipe 4 to cool the material. The PLC makes a discharge judgment every 2 minutes. When the material temperature is less than or equal to room temperature, the PLC stops and discharges the material. When the material temperature is less than or greater than the discharge temperature value, the material continues to be cooled; the main fan 7 maintains full-frequency 50Hz operation.

[0072] In S3 and S5, when the material temperature is lower than 34°C but greater than 28°C, the PLC controls the top sprays 1-6 to be closed through the second control terminal, suspends the liquid supply for spraying the extract, and allows the material to return to temperature. When the material temperature is greater than or equal to 40°C, the PLC controls the top sprays 1-6 to be opened through the second control terminal to resume liquid supply.

[0073] When the material temperature is lower than 28°C, the PLC controls the top spray 1-6 to be closed through the second control end, suspends the liquid supply, performs the blowing movement and reheats the material. When the material temperature is greater than or equal to 40°C and the blowing movement is completed, the PLC controls the top spray 1-6 to be opened through the second control end and resumes the liquid supply.

[0074] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention. Such changes fall within the scope of protection of the present invention.

Claims

1. A boiling granulation dryer automatic granulation process, characterized in that, The following steps are involved: S1. Build a granulation system: The granulation system includes a fluidized bed (1), wherein the fluidized bed (1) is provided with a base (1-1), a fluidized bed (1-2), a granulation chamber (1-3) and a collection chamber (1-4) in order from bottom to top; The base (1-1) is connected to an air inlet system (5), and the air inlet system (5) supplies hot air for temperature control and boiling to the fluidized bed (1); the granulation chamber (1-3) is connected to an atomization liquid supply system (3); S2, when the fluidized bed (1-2) is preheated to the feed temperature, the powder material is fed into the fluidized bed (1-2), and then the powder material is heated to the set material temperature; S3, start automatic segmented granulation, the automatic segmented granulation is divided into four stages; S31, first automatic granulation stage: the atomizing liquid supply system (3) transports the extract into the fluidized bed (1-2), controls the material temperature to be maintained above the granulation temperature, and stops transporting the extract when the extract spraying amount reaches the extract spraying amount of the first stage, and dries the material for t1 minute; S32, second stage automatic granulation: the atomizing liquid supply system (3) transports the extract into the fluidized bed (1-2), controls the material temperature to be maintained above the granulation temperature, and stops transporting the extract when the extract spraying amount reaches the second stage extract spraying amount, and dries the material for t2 minutes; S33, third stage automatic granulation: the atomizing liquid supply system (3) conveys the extract into the fluidized bed (1-2), controls the material temperature to be maintained above the granulation temperature, and stops conveying the extract when the extract spraying amount reaches the extract spraying amount of the third stage, and dries the material for t3 minutes; S34, the fourth stage of automatic granulation: the atomizing liquid supply system (3) transports the extract into the fluidized bed (1-2), controls the material temperature to be maintained above the granulation temperature, and stops transporting the extract when the extract spraying amount reaches the fourth stage extract spraying amount, and dries the material for t4 minutes; S4, delay drying of materials for t5 minutes; S5, starting material coloring: the atomizing liquid supply system (3) conveys the extract into the fluidized bed (1-2), controlling the material temperature to be maintained within the granulation temperature range, and when the cumulative extract spraying amount reaches the total extract spraying amount, delaying the extract delivery for t6 minutes; S6, drying the material for t7 minutes; S7, lowering the inlet air temperature, conveying dry cold air into the fluidized bed (1-2), lowering the material temperature, and when the material temperature is less than or equal to the discharge temperature value, stopping the machine and discharging the material.

2. The automatic granulation process of a boiling granulation dryer according to claim 1, characterized in that: In S1, the base (1-1) is connected to the air intake system (5) through an air intake pipe (4), the air intake pipe (4) is provided with an air intake temperature sensor (4-1) and an air intake volume regulating valve (4-2), the air intake system (5) is provided with a surface cooler (5-1) and a heat exchanger (5-2), the surface cooler (5-1) is provided with a condensation regulating valve (5-3), and the heat exchanger (5-2) is provided with a steam regulating valve (5-4); the fluidized bed (1- 2) is provided with a material temperature sensor (1-5); a top spray (1-6) is provided in the granulating chamber (1-3), and the top spray (1-6) is connected to the atomizing liquid supply system (3) through a liquid supply pipe (2), an extract flow sensor (2-1) is provided on the liquid supply pipe (2), and an electric heater (3-1) and an extract temperature sensor (3-2) are provided in the atomizing liquid supply system (3); the collecting chamber (1-4) is connected to the main fan (7) through an air outlet pipe (5); The material temperature sensor (1-5), the extract temperature sensor (3-2), the extract flow sensor (2-1), and the air inlet temperature sensor (4-1) are respectively connected to the first input terminal, the second input terminal, the third input terminal, and the fourth input terminal of the PLC; the main fan (7), the top spray (1-6), the electric heater (3-1), the air inlet volume regulating valve (4-2), the condensation regulating valve (5-3), and the steam regulating valve (5-4) are respectively connected to the first control terminal, the second control terminal, the third control terminal, the fourth control terminal, the fifth control terminal, and the sixth control terminal of the PLC; The material temperature sensor (1-5) can detect the material temperature in real time and send the material temperature to the PLC through the first input end; the extract temperature sensor (3-2) can detect the extract temperature in the atomizing liquid supply system (3) in real time and send the extract temperature to the PLC through the second input end; the extract flow sensor (2-1) can detect the extract flow in the liquid supply pipe (2) in real time and send the extract flow to the PLC through the third input end; the air inlet temperature sensor (4-1) can detect the air outlet temperature of the air inlet system in real time and send the air outlet temperature of the air inlet system to the PLC through the fourth input end.

3. The automatic granulation process of a boiling granulation dryer according to claim 2, characterized in that: In S2, the PLC controls the opening of the air inlet regulating valve (4-2), the condensation regulating valve (5-3) and the steam regulating valve (5-4) through the fourth control end, the fifth control end and the sixth control end respectively, and the surface cooler (5-1) and the heat exchanger (5-2) dehumidify and heat the air, and the treated dry hot air is sent into the fluidized bed (1-2) through the air inlet pipe (4), thereby preheating the fluidized bed (1-2). When the temperature in the fluidized bed (1-2) reaches the feeding temperature, the feeding is automatically performed; after the feeding is completed, the PLC controls the main fan (7) to start through the first control end, and the main fan (7) operates at the initial frequency, sucking the material into boiling motion in the fluidized bed (1-2) and the granulation chamber (1-3), and heating the material to the set material temperature through the dry hot air; The feed temperature range is 50-60°C, and the material setting temperature is 40-45°C.

4. The automatic granulation process of a boiling granulation dryer according to claim 2, characterized in that: In S31, the PLC controls the top spray (1-6) to spray the extract at a first speed uniformly through the second control terminal, and the extract is fully contacted and mixed with the boiling material. When the amount of the extract sprayed reaches the amount of the extract sprayed in the first stage, the top spray (1-6) stops spraying the extract; In S32, the PLC controls the top spray (1-6) to spray the extract at a first speed uniformly through the second control terminal, and the extract is fully contacted and mixed with the boiling material. When the amount of the extract sprayed reaches the amount of the extract sprayed in the second stage, the top spray (1-6) stops spraying the extract; In S33, the PLC controls the top spray (1-6) to spray the extract at a first speed uniformly through the second control terminal, and the extract is fully contacted and mixed with the boiling material. When the amount of the extract sprayed reaches the amount of the extract sprayed in the third stage, the top spray (1-6) stops spraying the extract; In S34, the PLC controls the top spray (1-6) to spray the extract at a first speed uniformly through the second control terminal, and the extract is fully contacted and mixed with the boiling material. When the amount of the extract sprayed reaches the amount of the extract sprayed in the fourth stage, the top spray (1-6) stops spraying the extract; In S31 to S34, the extract spraying amount of the first stage, the extract spraying amount of the second stage, the extract spraying amount of the third stage, and the extract spraying amount of the fourth stage decrease in sequence; the PLC also increases the operating frequency of the main fan (7) through the first control terminal, and the operating frequency of the main fan (7) increases as the cumulative extract spraying amount increases, and remains consistent with the operating frequency of the main fan (7) corresponding to the cumulative extract spraying amount; when the cumulative extract spraying amount reaches the sum of the extract spraying amount of the first stage, the extract spraying amount of the second stage, the extract spraying amount of the third stage, and the extract spraying amount of the fourth stage, the operating frequency of the main fan (7) reaches a full frequency of 50HZ; The values ​​of t1, t2, t3 and t4 are all in the range of 2 to 5 minutes.

5. The automatic granulation process of a boiling granulation dryer according to claim 1, characterized in that: In S4, the main fan (7) maintains full frequency 50 Hz operation, and the value of t5 is 2 minutes.

6. The automatic granulation process of a boiling granulation dryer according to claim 2, characterized in that: In S5, the PLC controls the top spray (1-6) to spray the extract at a second speed uniformly through the second control terminal, and the extract is fully contacted and mixed with the boiling material. When the cumulative extract spraying amount reaches the total extract spraying amount, the top spray (1-6) delays spraying the extract for t6 minutes; The main fan (7) maintains full frequency 50 Hz operation, and the value of t6 is 2 minutes.

7. The automatic granulation process of a boiling granulation dryer according to claim 4 or 6, characterized in that: The first speed is greater than the second speed.

8. The automatic granulation process of a boiling granulation dryer according to claim 1, characterized in that: In S3 and S5, when the material temperature is lower than the granulation temperature but higher than the blowing temperature, the PLC controls the top spray (1-6) to be closed through the second control terminal, suspends the liquid supply for spraying the extract, and performs material temperature recovery. When the material temperature is higher than or equal to the feeding temperature, the PLC controls the top spray (1-6) to be opened through the second control terminal to resume the liquid supply. When the material temperature is lower than the blasting temperature, the PLC controls the top spray (1-6) to be closed through the second control terminal, suspends the liquid supply, performs the blasting movement and heats the material. When the material temperature is greater than or equal to the feeding temperature and the blasting movement is completed, the PLC controls the top spray (1-6) to be opened through the second control terminal and resumes the liquid supply. The granulation temperature is 34-37°C, and the blowing temperature is 28-34°C.

9. The automatic granulation process of a boiling granulation dryer according to claim 1, characterized in that: In S6, the main fan (7) maintains full frequency 50 Hz operation, and the value of t7 is 2 to 5 minutes.

10. The automatic granulation process of a boiling granulation dryer according to claim 3, characterized in that: In S7, the PLC controls the steam regulating valve (5-4) through the sixth control terminal to close the heat exchanger (5-2), stop heating the air, and send dry cold air into the fluidized bed (1-2) through the air inlet pipe (4) to cool the material. The PLC makes a discharge judgment every t8 minutes. When the material temperature is less than or equal to the discharge temperature, the PLC stops and discharges the material. When the material temperature is less than or greater than the discharge temperature, the material continues to be cooled. The main fan (7) maintains full-frequency 50Hz operation, the t8 value is 2 minutes, and the discharge temperature is room temperature.

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