Intelligent energy-saving rotary tube drying system and drying method

Abstract

The application provides a kind of intelligent energy-saving rotary tube drying system, comprising: drying machine main body;Heat source system, heat source system includes heat source generator, temperature regulating module and heat exchange passage, heat exchange passage is communicated with drying machine main body;Detection system, detection system includes moisture content sensor and volatile component detector, moisture content sensor is used to detect outlet material moisture content, volatile component detector is installed in the tail gas outlet end of drying machine main body;Control system, with detection system and heat source system signal connection, control system is built-in preset moisture content threshold interval and the optimal drying temperature database corresponding to different volatile components, determines target heat source temperature after receiving detection data and sends control instruction to the temperature regulating module.The scheme can comprehensively utilize outlet material moisture content and volatile component information, realize heat source temperature intelligent precision control energy-saving rotary tube dryer.

Description

Technical Field

[0001] This invention relates to the field of chemical drying equipment technology, and in particular to an intelligent energy-saving rotary tube drying system and drying method. Background Technology

[0002] Rotary tube dryers, as a highly efficient bulk material drying equipment, are widely used in many industrial fields such as chemical, food, mining, and environmental protection. Their core function is to remove moisture and volatile substances from materials through full contact between the heat source and the material, so as to meet the requirements of subsequent processing or storage.

[0003] Currently, traditional rotary tube dryers mostly use fixed parameter settings or manual experience-based adjustment for heat source temperature control, lacking the ability to dynamically adapt to the material drying process. In actual production, the initial moisture content and composition distribution of the material to be dried often fluctuate, and the moisture content and volatile components of the outlet material dynamically change with operating conditions during the drying process. Fixed heat source temperature control methods cannot respond to these changes in real time: when the material moisture content is too high or the volatile components are complex, insufficient heat source temperature can lead to incomplete drying, affecting product quality; when the material moisture content is too low, excessively high heat source temperature can cause energy waste, and may also lead to overheating and deterioration of the material or excessive decomposition of volatiles, causing safety hazards and environmental problems. With the continuous improvement of industrial intelligence and energy conservation requirements, the control methods of traditional dryers are no longer able to meet the production requirements of high precision and low energy consumption.

[0004] While some existing technologies attempt to introduce sensor detection into drying equipment, most of them only perform simple feedback adjustment for a single moisture content parameter, without considering the impact of differences in volatile composition on the required drying temperature. Different volatiles have significantly different boiling points and thermal stability. If the heat source temperature is adjusted blindly without considering their compositional characteristics, it is still impossible to achieve the optimal balance between drying effect and energy efficiency. Summary of the Invention

[0005] To address the shortcomings of the existing technologies, the present invention aims to develop an energy-saving rotary tube dryer that can comprehensively utilize information on the moisture content and volatile composition of the outlet material to achieve intelligent and precise control of the heat source temperature, thereby solving problems such as low control accuracy, high energy consumption, and unstable product quality in the existing technologies.

[0006] To achieve the above objectives, the present invention provides an intelligent energy-saving rotary tube drying system, comprising:

[0007] Dryer body;

[0008] A heat source system, comprising a heat source generator, a temperature control module, and a heat exchange channel, wherein the heat exchange channel is connected to the dryer body;

[0009] The detection system includes a moisture content sensor and a volatile component detector. The moisture content sensor is used to detect the moisture content of the outlet material, and the volatile component detector is installed at the exhaust gas outlet of the dryer body.

[0010] The control system is connected to the detection system and the heat source system. The control system has a built-in database of preset moisture content threshold ranges and optimal drying temperatures corresponding to different volatile components. After receiving the detection data, the control system determines the target heat source temperature and sends control commands to the temperature regulation module.

[0011] In some embodiments, the dryer body is an inclined rotary cylinder, and the heat exchange channel is connected to the rotary cylinder; the inner wall of the cylinder is provided with lifting plates.

[0012] In some embodiments, the volatile component detector uses gas chromatography-mass spectrometry to identify the types of volatiles and quantify the content of each component.

[0013] In some embodiments, the control system incorporates a PID control algorithm or other control algorithms to optimize temperature control parameters based on the rate of change of moisture content data and volatile component data.

[0014] In some embodiments, the heat source generator is one of a steam boiler system, a steam generator, or a natural gas hot air furnace, and is equipped with a temperature control module.

[0015] In some embodiments, the moisture content sensor is any one of a thermally conductive humidity sensor, a resistive humidity sensor, and a capacitive humidity sensor.

[0016] In some embodiments, the intelligent energy-saving rotary tube drying system further includes:

[0017] A material conveying system, comprising a feeding device and a discharging device, wherein the feeding device and the discharging device are respectively connected to both ends of the dryer body;

[0018] The exhaust gas treatment device is connected to the exhaust gas outlet of the dryer body.

[0019] In some embodiments, the dryer body is a steam pipe dryer or any kind of rotary dryer; the feeding device is equipped with a dispersant and a conveying screw, and the discharging device is equipped with a rotary valve.

[0020] In some embodiments, the exhaust gas treatment device includes a bag filter and a cooler, wherein the bag filter is used to separate materials entrained in the exhaust gas and the cooler is used to remove liquid substances from the exhaust gas.

[0021] The present invention also provides an intelligent and energy-saving drying method, which employs the intelligent and energy-saving rotary tube drying system described above. The drying method includes the following steps:

[0022] S1, Feeding and Initial Conditioning

[0023] The material is continuously fed into the rotary drum through the feeding device. In the initial stage, the control system starts the heat source system according to the preset initial temperature, and at the same time, the detection system is turned on to collect data in real time.

[0024] During the drying process of the first batch of materials, the detection system completes several full detection cycles, and the control system automatically matches the initial target temperature in the database based on the initial moisture content and volatile composition data.

[0025] S2, Dynamic Temperature Control

[0026] When the moisture content sensor detects that the moisture content of the discharged material has risen above the threshold, and the volatile component detector shows that the volatiles are mainly water, the control system uses the PID algorithm to calculate and send a heating command to the temperature regulation module to increase the heat source temperature and at the same time increase the cylinder speed to improve drying efficiency.

[0027] When the moisture content drops below the threshold, the control system automatically matches the database, lowers the heat source temperature to a certain value, and reduces the gas supply to reduce energy consumption.

[0028] S3, Material Discharge and Closed-Loop Control

[0029] The dried material is conveyed to the subsequent silo via the discharge device. During the process, the moisture content sensor continuously monitors the moisture content to ensure that the moisture content of the finished product remains stable within the target range.

[0030] The control system records the drying temperature, energy consumption data, and volatile composition change curves of each batch of materials in real time, forming a production ledger and supporting data traceability and algorithm parameter optimization.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] The intelligent energy-saving rotary tube drying system provided by this invention can be applied to industries such as chemical, petrochemical, metallurgy, and pharmaceutical, and is suitable for various heat-sensitive materials and bulk materials.

[0033] The intelligent energy-saving rotary tube drying system provided by this invention consists of a dryer body, a heat source system, a detection system, a control system, a material conveying system, and a tail gas treatment device. Its core function lies in the real-time acquisition of data on the moisture content of the outlet material and the volatile components in the tail gas through the detection system. Combined with the moisture content threshold range and the volatile-optimal drying temperature database built into the control system, the system dynamically optimizes the heat source temperature and dryer operating parameters using PID and other adjustment algorithms. Examples using materials such as PTA demonstrate that the system can accurately adapt to fluctuations in the initial state of the material. While ensuring that the moisture content, purity, and other indicators of the dried material meet the standards, it avoids overheating and deterioration of the material, reduces energy consumption, and achieves intelligent and precise control and energy-efficient operation of the drying process. This solves the problems of low control accuracy, high energy consumption, and unstable product quality in existing technologies. Attached Figure Description

[0034] Figure 1 This is a process flow diagram of the intelligent energy-saving rotary tube drying system shown in an embodiment of the present invention;

[0035] Figure 2 This is a framework diagram of the intelligent energy-saving rotary tube drying system shown in an embodiment of the present invention. Detailed Implementation

[0036] See Figure 1-2 An embodiment of the present invention provides an intelligent energy-saving rotary tube drying system, comprising: a dryer body; a heat source system, the heat source system including a heat source generator, a temperature regulation module, and a heat exchange channel, the heat exchange channel being connected to the dryer body, the heat source generator providing the heat energy required for drying, and the temperature regulation module adjusting the output temperature according to a control signal; a detection system including a moisture content sensor and a volatile component detector, the moisture content sensor detecting the moisture content of the outlet material, and the volatile component detector being installed at the exhaust gas outlet of the dryer body; and a control system connected to the detection system and the heat source system, the control system having a built-in preset moisture content threshold range and an optimal drying temperature database corresponding to different volatile components, receiving detection data to determine the target heat source temperature and sending a control command to the temperature regulation module. Specifically, the control system receives moisture content data and volatile component data transmitted by the detection system, determines the target heat source temperature under the current operating conditions through comparative analysis, and sends a control command to the temperature regulation module of the heat source system to achieve dynamic adjustment of the heat source temperature.

[0037] In this embodiment, the dryer body is an inclined rotary cylinder, and the heat exchange channel is connected to the rotary cylinder to realize heat exchange between the heat source and the material; the inner wall of the cylinder is provided with lifting plates to increase the contact area between the material and the heat source and achieve uniform drying.

[0038] The volatile component detector described in this embodiment uses gas chromatography-mass spectrometry to identify the types of volatiles and quantify the content of each component, ensuring the accuracy of component detection.

[0039] The control system described in this embodiment incorporates a PID control algorithm or any other control algorithm to optimize temperature control parameters based on the rate of change of moisture content data and volatile component data. This dynamic optimization of temperature control parameters avoids excessive temperature fluctuations and improves control stability.

[0040] In this embodiment, the heat source generator is one of a steam boiler system, a steam generator, or a natural gas hot air furnace, and is equipped with a temperature regulation module.

[0041] In this embodiment, the humidity sensor can be any one of a thermally conductive humidity sensor, a resistive humidity sensor, or a capacitive humidity sensor.

[0042] In this embodiment, the intelligent energy-saving rotary tube drying system further includes: a material conveying system, which includes a feeding device and a discharging device, which are respectively connected to both ends of the dryer body to realize continuous feeding and discharging of materials; and an exhaust gas treatment device, which is connected to the exhaust gas outlet of the dryer body for exhaust gas treatment and analysis.

[0043] In this embodiment, the dryer body is a steam pipe dryer or any kind of rotary drying equipment;

[0044] In this embodiment, the feeding device is equipped with a dispersant and a conveying screw to ensure normal material transport; the discharging device is equipped with a rotary valve, or can be any type of output device, to ensure normal product transport; the feeding system is equipped with a dispersant and a conveying screw to ensure normal material transport; and the discharging system is equipped with a rotary valve to ensure normal product transport.

[0045] The exhaust gas treatment device in this embodiment includes a bag filter and a cooler. The bag filter is used to separate materials entrained in the exhaust gas, and the cooler is used to remove liquid substances from the exhaust gas. The bag filter and cooler can be other separation equipment. This embodiment includes an exhaust gas treatment process. First, the exhaust gas passes through a bag filter to remove materials entrained in the carrier gas, which are then collected by a rotary valve below the bag filter. A cooler is then used to remove liquid substances from the exhaust gas.

[0046] Another embodiment of the present invention provides an intelligent energy-saving drying method, which employs the intelligent energy-saving rotary tube drying system as described in the previous embodiment. The drying method includes the following steps:

[0047] S1, Feeding and Initial Conditioning

[0048] The material is continuously fed into the rotary drum through the feeding device. In the initial stage, the control system starts the heat source system according to the preset initial temperature, and at the same time, the detection system is turned on to collect data in real time.

[0049] During the drying process of the first batch of materials, the detection system completes several full detection cycles, and the control system automatically matches the initial target temperature in the database based on the initial moisture content and volatile composition data.

[0050] S2, Dynamic Temperature Control

[0051] When the moisture content sensor detects that the moisture content of the discharged material has risen above the threshold, and the volatile component detector shows that the volatiles are mainly water, the control system uses the PID algorithm to calculate and send a heating command to the temperature regulation module to increase the heat source temperature and at the same time increase the cylinder speed to improve drying efficiency.

[0052] When the moisture content drops below the threshold, the control system automatically matches the database, lowers the heat source temperature to a certain value, and reduces the gas supply to reduce energy consumption.

[0053] S3, Material Discharge and Closed-Loop Control

[0054] The dried material is conveyed to the subsequent silo via the discharge device. During the process, the moisture content sensor continuously monitors the moisture content to ensure that the moisture content of the finished product remains stable within the target range.

[0055] The control system records the drying temperature, energy consumption data, and volatile composition change curves of each batch of materials in real time, forming a production ledger and supporting data traceability and algorithm parameter optimization.

[0056] In more detail, this invention provides specific examples of drying processes for certain substances, as follows:

[0057] I. In one embodiment, the drying of polyvinyl chloride (PVC) resin specifically includes:

[0058] A chemical company is drying polyvinyl chloride resin. The initial moisture content of the material is 6%-12%, containing vinyl chloride monomer (volatile matter, boiling point -13.9℃) and moisture. The requirement is that the moisture content after drying is ≤0.3%, and the vinyl chloride residue is ≤1ppm to avoid resin aging caused by high temperature.

[0059] (1) System Configuration

[0060] - Dryer body: Rotary cylinder with combined lifting plates on the inner wall, tilted at an angle of 2.5°.

[0061] - Heat source system: Steam heat exchange type heat source generator (steam pressure 0.8MPaG), temperature adjustment range 40℃-120℃, response time ≤5s.

[0062] - Detection system: microwave moisture content sensor (online detection frequency 1 time / second), gas chromatography-mass spectrometry (real-time monitoring of vinyl chloride concentration).

[0063] - Control system: Built-in database contains "vinyl chloride-polyvinyl chloride" adaptation parameters, with a moisture content threshold range of 0.2%-0.3%, and the PID control algorithm response coefficient is optimized to 0.8.

[0064] (2) The operation process is as follows:

[0065] The initial moisture content of the material is 10%, the vinyl chloride content is 8ppm, the control system is matched to the target temperature of 65℃, and the heat source system starts steam heat exchange.

[0066] After drying for 30 minutes, the moisture content decreased to 3%, the vinyl chloride content decreased to 2 ppm, and the system dynamically cooled down to 58°C.

[0067] Five minutes before discharge, the moisture content was close to 0.3%, and the temperature stabilized at 55℃. The final discharge moisture content was 0.28%, and the vinyl chloride residue was 0.8 ppm.

[0068] II. In another embodiment, the pretreatment and drying of PTA (purified terephthalic acid) raw material specifically includes:

[0069] The processing capacity is 10t / h. The initial moisture content of the PTA material to be dried fluctuates between 0.8% and 2.5%. The main volatiles are moisture and trace amounts of acetic acid (≤0.1%) and dimethyl phthalate (≤0.05%).

[0070] - Core objective: To achieve stable control of PTA moisture content at ≤0.2% after drying (meeting production feed standards) through intelligent dynamic temperature regulation, while reducing energy consumption per unit of material and avoiding the increase of 4-CBA content due to overheating of the material (to prevent affecting subsequent polyester reactions).

[0071] (1) System configuration adaptation optimization

[0072] Dryer body adapter

[0073] - Rotary cylinder parameters: tilt angle 3°, rotation speed 3-5r / min, adapted to the flow characteristics of PTA bulk materials.

[0074] - Lifting plate design: Adopting a combined L-shaped lifting plate with a lifting plate spacing of 300mm and a lifting height of 150mm, ensuring that PTA material is fully scattered in the cylinder, increasing the contact area with the hot airflow by 20%, and avoiding uneven drying in some areas.

[0075] Customized heat source system

[0076] - Heat source generator: Natural gas combustion hot air furnace is selected, with a heat power adjustment range of 500-1200kW, which is suitable for the low-temperature flexible drying requirements of PTA materials (to avoid high-temperature deterioration).

[0077] - Temperature control module: Equipped with a proportional gas control valve and an air flow linkage device, the temperature control accuracy is ±2℃ and the response delay is ≤3s.

[0078] Targeted configuration of the detection system

[0079] - Moisture content sensor: Installed above the material conveyor belt of the discharge device, with a detection frequency of 10 times / min and a moisture content detection error of ≤±0.05%, suitable for the detection requirements of PTA powder materials.

[0080] - Volatile component detector: Gas chromatography-mass spectrometry (GC-MS) is used and installed in the exhaust gas outlet pipe of the dryer (500mm from the outlet). The detection cycle is 3 minutes / time, which can accurately identify volatile components such as acetic acid and dimethyl phthalate.

[0081] Control system parameter preset

[0082] - Moisture content threshold range: Set the target threshold to 0.15%-0.2%. If it is below 0.15%, a cooling command will be triggered; if it is above 0.2%, a heating command will be triggered.

[0083] - Optimal drying temperature database: Preset temperature parameters corresponding to key volatile components of PTA materials - when moisture is dominant, the optimal temperature is 120-130℃; when acetic acid content is ≥0.08%, the optimal temperature is 110-115℃ (to avoid excessive acetic acid volatilization leading to energy waste); when dimethyl phthalate content is ≥0.03%, the optimal temperature is 105-110℃ (to prevent its thermal decomposition and the generation of impurities).

[0084] - PID control algorithm parameters: proportional coefficient Kp=3.5, integral time Ti=60s, derivative time Td=15s, adapted to the dynamic temperature and humidity changes in the PTA drying process.

[0085] (2) Implementation process

[0086] Feeding and initial conditioning

[0087] - PTA material is continuously fed into the rotary drum through the feeding device. In the initial stage, the control system starts the heat source system at the preset initial temperature (120℃) and at the same time starts the detection system to collect data in real time.

[0088] - During the drying process of the first batch of materials, the detection system completes 3 full detection cycles. Based on the initial moisture content and volatile composition data, the control system automatically matches the initial target temperature in the database (e.g., when the initial moisture content is 2.0% and the acetic acid content is 0.05%, the target temperature is set to 125℃).

[0089] Dynamic temperature regulation

[0090] When the moisture content sensor detects that the moisture content of the discharged PTA has risen to 0.22% (exceeding the threshold), and GC-MS detection shows that the volatiles are mainly water (acetic acid 0.04%, dimethyl phthalate 0.02%), the control system calculates through the PID algorithm and sends a heating command to the temperature regulation module to raise the heat source temperature to 130℃, while increasing the cylinder rotation speed to 4r / min to improve drying efficiency.

[0091] - When the moisture content drops to 0.14% (below the threshold) and the acetic acid content is detected to rise to 0.09%, the control system automatically matches the database, lowers the heat source temperature to 112°C, and reduces the gas supply to reduce energy consumption.

[0092] If the dimethyl phthalate content is detected to rise to 0.035%, the low-temperature protection mechanism is triggered, forcibly lowering the temperature to 108°C to prevent its thermal decomposition from affecting the purity of PTA.

[0093] Material discharge and closed-loop management

[0094] - The dried PTA material is conveyed to the subsequent silo via the discharge device. During the process, the moisture content sensor continuously monitors the moisture content to ensure that the finished product moisture content remains stable within the target range.

[0095] - The control system records the drying temperature, energy consumption data, and volatile composition change curves of each batch of materials in real time, forming a production ledger and supporting data traceability and algorithm parameter optimization (the optimal temperature database is automatically updated every 100 hours of operation).

[0096] III. In another embodiment, the pretreatment and drying of POM (polyoxymethylene) raw materials specifically includes:

[0097] Polyoxymethylene (POM), as a highly crystalline engineering plastic, is sensitive to temperature during the drying process. High temperatures can easily lead to thermal degradation of the material, producing formaldehyde volatiles (which are toxic and corrosive), while low temperatures cannot effectively remove surface adsorbed water and trace amounts of residual monomers, affecting the dimensional stability and mechanical properties of subsequent injection molding.

[0098] Polyoxymethylene granular material has an initial moisture content that fluctuates between 0.3% and 1.2%, and its main volatiles are moisture, trace amounts of formaldehyde monomer (≤0.08%) and formic acid (≤0.03%).

[0099] Core objective: Through intelligent dynamic control, achieve a stable moisture content of ≤0.1% for polyoxymethylene after drying (meeting injection molding feed standards), formaldehyde residue ≤0.01ppm, and formic acid residue ≤0.005%, avoiding safety and environmental risks caused by thermal degradation.

[0100] (1) System configuration adaptation

[0101] Customized dryer body

[0102] - Rotary cylinder parameters: tilt angle 2° (reduces material residence time fluctuation), rotation speed 2-4r / min, adapted to the flow characteristics of polyoxymethylene particles, and avoids overheating due to accumulation.

[0103] - Lifting plate design: The lifting plates are curved with a spacing of 400mm and a lifting height of 120mm. They are equipped with a wear-resistant coating to reduce wear on polyoxymethylene particles and ensure uniform contact between the material and the hot airflow.

[0104] Heat source system adaptation

[0105] - Heat source generator: Low-pressure steam heat exchange type heat source (steam pressure 0.4MPaG) is selected, and the heat power adjustment range is 400-900kW to avoid local high temperature caused by direct heat from open flame.

[0106] - Temperature control module: Equipped with an electromagnetic proportional control valve and a steam flow feedback device, the temperature control accuracy is ±1℃, the response delay is ≤2s, and it is suitable for the narrow temperature range drying requirements of polyoxymethylene (optimal temperature range 80-100℃).

[0107] Targeted configuration of the detection system

[0108] - Moisture content sensor: A capacitive online detector is installed above the discharge rotary valve, with a detection frequency of 15 times / min and a moisture content detection error of ≤±0.02%, suitable for real-time monitoring of granular materials.

[0109] - Volatile component detector: GC-MS instrument is installed in the exhaust gas outlet pipe (300mm from the outlet), with a detection cycle of 2min / time. It focuses on qualitative and quantitative analysis of formaldehyde and formic acid, with a quantification error of ≤±0.001%. It is also equipped with a formaldehyde rapid alarm sensor (response time ≤1s).

[0110] Control system parameter preset

[0111] - Moisture content threshold range: target threshold 0.08%-0.1%. Below 0.08%, cooling is triggered; above 0.1%, heating is triggered; above 0.15%, the material conveying system is slowed down to extend the drying time.

[0112] - Optimal drying temperature database: When moisture content is dominant (formaldehyde ≤ 0.03%, formic acid ≤ 0.01%), the optimal temperature is 95-100℃; when formaldehyde content is ≥ 0.05%, the temperature should be reduced to 85-90℃ (to inhibit formaldehyde volatilization and material degradation); when formic acid content is ≥ 0.02%, the temperature should be reduced to 80-85℃ (to avoid formic acid corrosion of equipment and energy waste).

[0113] - PID control algorithm parameters: proportional coefficient Kp=2.8, integral time Ti=45s, derivative time Td=12s, superimposed with fuzzy control logic to quickly respond to sudden changes in volatile composition.

[0114] (2) Implementation process

[0115] Feeding and initial conditioning

[0116] - The feeding device continuously feeds polyoxymethylene granules into the cylinder through a conveying screw and a disperser. The control system starts the heat source at the initial preset temperature of 90°C, and the detection system starts data acquisition simultaneously.

[0117] - Within 10 minutes of drying the first batch of material, 5 testing cycles are completed. If the initial moisture content is 1.0%, formaldehyde is 0.04%, and formic acid is 0.01%, the control system matches the database target temperature of 98℃ and the cylinder rotation speed is set to 3r / min.

[0118] Dynamic temperature regulation

[0119] - When the moisture content rises to 0.11% (exceeding the threshold), GC-MS shows that the volatiles are mainly water (formaldehyde 0.03%, formic acid 0.008%). The control system uses a PID algorithm to instruct the temperature adjustment module to raise the temperature to 99℃, increase the rotation speed to 3.5r / min, and increase the steam supply.

[0120] - When the moisture content drops to 0.07% (below the threshold) and the formaldehyde content is detected to rise to 0.06%, the system automatically matches the low temperature parameters, cools down to 88℃, reduces steam consumption, and simultaneously activates the exhaust gas treatment system to enhance formaldehyde adsorption.

[0121] - If the formic acid content rises to 0.025%, a special control measure will be triggered, forcibly cooling the temperature to 83℃ and sending an early warning of excessive formic acid to the central control room to prevent equipment corrosion and material performance deterioration.

[0122] Material discharge and closed-loop management

[0123] - After drying, the material is conveyed to the finished product silo via a rotary valve. The moisture content sensor continuously monitors the moisture content to ensure that the finished product moisture content is stable in the range of 0.09%-0.1%, formaldehyde residue ≤0.008ppm, and formic acid residue ≤0.004%.

[0124] The intelligent energy-saving rotary tube drying system provided in this embodiment of the invention utilizes a humidity sensor installed at the material outlet and a chromatographic mass spectrometer at the exhaust gas outlet to monitor the humidity of the product and the volatile matter in the exhaust gas in real time, thereby adjusting the heat source and the rotation speed of the rotary dryer to achieve intelligent control of the rotary dryer.

[0125] The intelligent energy-saving rotary tube drying system provided by this invention relates to the drying of bulk and heat-sensitive materials in multiple industries such as chemical and petrochemical. The system consists of a dryer body, a heat source system, a detection system, a control system, a material conveying system, and a tail gas treatment device. The detection system collects real-time data on the moisture content of the outlet material and the volatile components in the tail gas. Combined with the moisture content threshold range and the volatile-optimal drying temperature database built into the control system, PID and other adjustment algorithms are used to dynamically optimize the heat source temperature and dryer operating parameters. Examples of systems for materials such as PTA demonstrate that the system can accurately adapt to fluctuations in the initial state of the material, ensuring that the moisture content, purity, and other indicators of the dried material meet the standards while preventing overheating and deterioration, thus reducing energy consumption. This achieves intelligent and precise control and energy-efficient operation of the drying process, solving the problems of low control accuracy, high energy consumption, and unstable product quality in existing technologies.

[0126] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An intelligent energy-saving rotary tube drying system, characterized in that: include: Dryer body; A heat source system, comprising a heat source generator, a temperature control module, and a heat exchange channel, wherein the heat exchange channel is connected to the dryer body; The detection system includes a moisture content sensor and a volatile component detector. The moisture content sensor is used to detect the moisture content of the outlet material, and the volatile component detector is installed at the exhaust gas outlet end of the dryer body. The control system is connected to the detection system and the heat source system. The control system has a built-in database of preset moisture content threshold ranges and optimal drying temperatures corresponding to different volatile components. After receiving the detection data, the control system determines the target heat source temperature and sends control commands to the temperature regulation module.

2. The intelligent energy-saving rotary tube drying system according to claim 1, characterized in that: The dryer body is an inclined rotary cylinder, and the heat exchange channel is connected to the rotary cylinder; the inner wall of the cylinder is provided with lifting plates.

3. The intelligent energy-saving rotary tube drying system according to claim 1, characterized in that: The volatile component detector uses gas chromatography-mass spectrometry to identify the types of volatiles and quantify the content of each component.

4. The intelligent energy-saving rotary tube drying system according to claim 1, characterized in that: The control system incorporates a PID control algorithm or other control algorithms to optimize temperature control parameters based on the rate of change of moisture content data and volatile component data.

5. The intelligent energy-saving rotary tube drying system according to claim 1, characterized in that: The heat source generator is one of a steam boiler system, a steam generator, or a natural gas hot air furnace, and is equipped with a temperature control module.

6. The intelligent energy-saving rotary tube drying system according to claim 1, characterized in that: The humidity sensor can be any one of a thermally conductive humidity sensor, a resistive humidity sensor, or a capacitive humidity sensor.

7. The intelligent energy-saving rotary tube drying system according to claim 1, characterized in that: Also includes: A material conveying system, comprising a feeding device and a discharging device, wherein the feeding device and the discharging device are respectively connected to both ends of the dryer body; The exhaust gas treatment device is connected to the exhaust gas outlet of the dryer body.

8. The intelligent energy-saving rotary tube drying system according to claim 7, characterized in that: The main body of the dryer is a steam pipe dryer or any kind of rotary drying equipment; The feeding device is equipped with a dispersant and a conveying screw, and the discharging device is equipped with a rotary valve.

9. The intelligent energy-saving rotary tube drying system according to claim 7, characterized in that: The exhaust gas treatment device includes a bag filter and a cooler. The bag filter is used to separate materials mixed in with the exhaust gas, and the cooler is used to remove liquid substances from the exhaust gas.

10. An intelligent energy-saving drying method, characterized in that: The drying method using the intelligent energy-saving rotary tube drying system as described in any one of claims 1-9 includes the following steps: S1, Feeding and Initial Conditioning The material is continuously fed into the rotary drum through the feeding device. In the initial stage, the control system starts the heat source system according to the preset initial temperature, and at the same time, the detection system is turned on to collect data in real time. During the drying process of the first batch of materials, the detection system completes several full detection cycles, and the control system automatically matches the initial target temperature in the database based on the initial moisture content and volatile composition data. S2, Dynamic Temperature Control When the moisture content sensor detects that the moisture content of the discharged material has risen above the threshold, and the volatile component detector shows that the volatiles are mainly water, the control system uses the PID algorithm to calculate and send a heating command to the temperature regulation module to increase the heat source temperature and at the same time increase the cylinder speed to improve drying efficiency. When the moisture content drops below the threshold, the control system automatically matches the database, lowers the heat source temperature to a certain value, and reduces the gas supply to reduce energy consumption. S3, Material Discharge and Closed-Loop Control The dried material is conveyed to the subsequent silo via the discharge device. During the process, the moisture content sensor continuously monitors the moisture content to ensure that the moisture content of the finished product remains stable within the target range. The control system records the drying temperature, energy consumption data, and volatile composition change curves of each batch of materials in real time, forming a production ledger and supporting data traceability and algorithm parameter optimization.

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