Rotary flash drying machine and reaction kettle device and method for producing mancozeb crude drug

Abstract

This invention belongs to the field of intelligent industrial process control technology in the intelligent manufacturing equipment industry, specifically disclosing a rotary flash dryer and reaction vessel apparatus and method for the production of mancozeb technical. The rotary flash dryer and reaction vessel apparatus and method for the production of mancozeb technical is scheduled and executed by a central coordinating controller. After the reaction vessel parameters meet the endpoint criteria in real time, the wet material is triggered to be conveyed to the rotary flash dryer in a nitrogen-protected, sealed manner. A gradient thermal field is established in the drying chamber, the moisture content of the discharged material is detected online, and the rotation speed of the dispersing disc is dynamically adjusted. This, combined with a grading ring, achieves closed-loop particle size control, and simultaneously implements tail gas reuse and collaborative optimization control. This invention is suitable for the intelligent manufacturing equipment industry, improving product quality, consistency of physicochemical indicators, and production energy efficiency.

Description

Technical Field

[0001] This invention belongs to the field of intelligent industrial process control technology in the intelligent manufacturing equipment industry, specifically relating to a rotary flash dryer and reaction vessel apparatus and method for the production of mancozeb technical. Background Technology

[0002] Mancozeb, an important protective broad-spectrum fungicide, relies heavily on drying during its technical production process, which is crucial for the final product's chemical purity, physical form, and storage stability. Because mancozeb is a heat-sensitive material and its wet form exhibits high chemical reactivity, the drying process must simultaneously meet multiple stringent requirements, including efficient dehydration, strict temperature control, and prevention of moisture absorption. Existing technologies have explored various solutions, but due to inherent limitations in their fundamental principles or system architectures, they are unable to achieve high-quality, highly consistent, and continuously stable production on an industrial scale. Furthermore, they fail to meet the core requirements of intelligent manufacturing equipment industries for intelligent process control and end-to-end collaborative management.

[0003] Among existing patented technologies, Chinese patent CN101543681B proposes a two-stage combined process of "spray drying plus vacuum drying." This scheme first utilizes spray drying to rapidly remove surface moisture, and then uses vacuum drying to deeply remove bound water. Although this design improves the drying rate to some extent, the spray drying process relies on the instantaneous mixing of high-temperature hot air and atomized slurry. This process, based on the principles of convective heat and mass transfer, while exhibiting high heat exchange intensity, inevitably creates a difficult-to-eliminate high-temperature gradient near the atomizing nozzle and in the hot air inlet area. According to the Arrhenius equation, localized overheating will significantly accelerate the thermal decomposition kinetics of manganese zinc molecules, leading to a decrease in the main content of the product and changes in color. The vacuum drying process, introduced to compensate for the incompleteness of the primary drying, works by lowering the boiling point of water by reducing pressure. While it can achieve gentle drying, it mainly relies on conduction for heat transfer, which is inefficient. This results in a long overall process chain, high energy consumption, and the series connection of multiple independent units (spray tower, intermediate silo, vacuum dryer) essentially disrupts the continuity of the production process, increasing the risk of material exposure, contamination, and batch mixing.

[0004] The invention patent with announcement number CN108250245B focuses on nanoscale synthesis, but the drying unit still uses traditional oven or vacuum drying methods to process the filter cake. This scheme treats drying as a completely independent post-processing step, following a discrete operation mode of "reaction-filtration-transfer-drying". From the basic principles of process engineering, this mode has the following shortcomings: the highly active wet filter cake at the reaction endpoint is inevitably exposed to the environment during transfer and temporary storage, making it prone to physical moisture absorption and chemical changes, introducing uncontrollable initial condition fluctuations for subsequent drying. At the same time, oven drying is mainly based on the principle of heat conduction, which has low heat flux density and uneven distribution of temperature and humidity fields in the drying chamber, resulting in long drying cycles, high energy consumption, and poor consistency within and between product batches, failing to meet the efficiency and quality requirements of modern continuous and large-scale production.

[0005] Existing technologies mostly employ open-loop or single-loop control, such as fixing only the hot air temperature or the speed of the dispersing disc, without a central coordinating controller to achieve multi-parameter coordinated control. This makes them unable to respond in real time to critical disturbances such as feed humidity and material characteristic fluctuations, resulting in a significant gap compared to the intelligent industrial process control standards of the intelligent manufacturing equipment industry. This leads to weak anti-interference capabilities in the drying process and large fluctuations in product moisture content.

[0006] Although existing technologies have made some improvements in certain areas, they are limited by the inherent defects in their process principles (the contradiction between instantaneous high temperature and static conduction) and system architecture (the superposition of discrete units and process interruption). They have not been able to fundamentally solve a series of interrelated and mutually restrictive technical problems such as the protection of heat-sensitive materials, deep and uniform dehydration, continuous process, and precise and coordinated control of multiple parameters. Summary of the Invention

[0007] The purpose of this invention is to provide a rotary flash dryer and reaction vessel apparatus and method for the production of mancozeb technical, which solves the technical problems of thermal decomposition, large fluctuations in moisture and particle size indicators, and low energy efficiency of heat-sensitive mancozeb technical during the drying process due to discontinuous process, uncontrollable heat field, and lack of multi-parameter coordination.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0009] The control method for the rotary flash dryer used in the production of mancozeb technical grade is scheduled and executed by a central coordinating controller, including the following steps:

[0010] Continuous triggering and conveying steps: Real-time monitoring of pH value, conductivity, turbidity and temperature distribution in the synthesis reactor. When the monitoring data simultaneously meet the preset endpoint criteria, the wet material conveying command is immediately triggered, so that the wet filter cake after the reaction is completed is continuously fed into the feed port of the rotary flash dryer through a fully enclosed pipeline under nitrogen positive pressure protection.

[0011] Gradient thermal field drying step: In the vertical drying chamber of the rotary flash dryer, three independently temperature-controlled hot air zones are established and maintained from bottom to top, namely the bottom high temperature zone, the middle medium temperature zone, and the top low temperature zone, wherein the hot air temperature of the bottom high temperature zone is higher than that of the top low temperature zone.

[0012] Moisture closed-loop control steps: Real-time online detection of the moisture content of the dried material, and dynamic adjustment of the rotation speed of the dispersion disk in the drying chamber based on the deviation between the detected value and the target value, so as to change the dispersion degree, the throwing trajectory and the contact efficiency with hot air of the material, thereby indirectly affecting the residence time and drying intensity of the material in the effective drying area, and realizing closed-loop control of the moisture content of the discharged material.

[0013] Furthermore, the preset endpoint criterion is:

[0014] The pH value fluctuates within the range of 7.8 to 8.2 for 30 consecutive seconds with a fluctuation range not exceeding ±0.1, the rate of decrease in conductivity is less than 0.5 mS / (cm·min), the rate of change of turbidity value within the range of 3500 to 3800 NTU for 60 consecutive seconds is less than 2%, and the maximum temperature difference between measuring points at different heights in the reactor does not exceed 1.5℃.

[0015] Furthermore, in the continuous triggering and conveying step, the nitrogen gauge pressure in the fully enclosed pipeline is maintained at 0.15 MPa, the conveying velocity of the wet filter cake is 1.2 m / s, and the time from command triggering to all the wet material entering the dryer does not exceed 30 seconds.

[0016] Furthermore, in the gradient thermal drying step, the hot air temperature in the bottom high-temperature zone is set to 180℃±2℃, the hot air temperature in the middle medium-temperature zone is set to 140℃±2℃, and the hot air temperature in the top low-temperature zone is set to 90℃±2℃; the main hot air supplying heat to the drying chamber is generated by a low-NOx burner. Independent and precise closed-loop control of the hot air temperature in the three zones is achieved through independent air inlet ducts located at the bottom, middle, and top of the drying chamber, and temperature control devices on each duct (e.g., electric heaters on branch ducts to increase the air temperature, or cold air mixing valves to decrease the air temperature) and temperature sensors.

[0017] Furthermore, the hot air supplying heat to the drying chamber is generated by a low-NOx burner, which uses an oxygen content sensor to control the oxygen volume fraction in the combustion flue gas in a closed loop between 3% and 5%; and / or, the inner wall of the drying chamber is coated with a polytetrafluoroethylene anti-stick coating with a thickness of 50 to 80 micrometers.

[0018] Furthermore, in the closed-loop moisture control step, a near-infrared spectroscopy analyzer is used to perform real-time online detection of the moisture content. Its detection probe directly contacts the material flow, the sampling frequency is not less than 1Hz, and the moisture measurement accuracy is ±0.03%. The specific method for dynamically adjusting the speed of the dispersion disk is as follows: when the detected moisture content is higher than the upper limit of the target value, the speed is reduced; when the detected moisture content is lower than the lower limit of the target value, the speed is increased.

[0019] Furthermore, the dispersing disc has a double-layer counter-rotating blade structure, with the upper and lower blades rotating in opposite directions. The upper blades are installed at an angle of 30 degrees, and the lower blades are installed at an angle of 45 degrees. The rotational speed of the dispersing disc is continuously adjustable within the range of 800 to 2500 rpm via a frequency converter.

[0020] Furthermore, it also includes physical form coordinated control steps:

[0021] Particle size closed-loop control steps: A grading ring with an electrically adjustable inner diameter is installed in the upper part of the drying chamber, and the particle size distribution of the discharged powder is detected online in real time; the central coordinating controller dynamically adjusts the inner diameter of the grading ring according to the deviation between the detected 90% cumulative particle size D90 value and the target range, so as to achieve closed-loop control of the finished product particle size.

[0022] Furthermore, in the particle size closed-loop control step, the particle size control setting logic is as follows: when the output D90 value exceeds 18 micrometers, the inner diameter of the grading ring is reduced; when the D90 value is lower than 15 micrometers, the inner diameter of the grading ring is increased, so that the finished product D90 value is stabilized in the range of 16 to 20 micrometers.

[0023] Furthermore, the central coordinating controller performs a coordinating optimization calculation to simultaneously determine the dispersion disk rotation speed adjustment amount in the moisture closed-loop control step and the grading ring inner diameter adjustment amount in the particle size closed-loop control step.

[0024] The collaborative optimization calculation is achieved by solving the following constrained quadratic programming problem in each control cycle: minimizing the objective function. And simultaneously satisfy the following constraints: , .

[0025] in, This is the current measured moisture content. The target value for moisture content; For the present Measured value for Target value; and These are the current rotational speed of the dispersing disk and the inner diameter of the grading ring, respectively. and The adjustment amount to be determined; , , , These are the allowable ranges for rotational speed and inner diameter, respectively. , , , For weighting coefficients greater than zero, their typical range of values ​​is... The specific values ​​are determined through simulation or on-site tuning. This optimization problem can be solved using standard quadratic programming solvers such as the effective set method or the interior point method.

[0026] Furthermore, it also includes exhaust gas resource recovery steps:

[0027] The exhaust gas discharged from the drying chamber is subjected to gas-solid separation, condensation and recovery, and organic matter concentration monitoring in sequence;

[0028] When the monitored non-methane total hydrocarbon concentration is below 500 ppm, the first part of the exhaust gas is returned to the hot air system for waste heat utilization, and the second part of the exhaust gas is introduced into the waste gas treatment system.

[0029] When the concentration is not less than 500 ppm, all exhaust gas is treated by an activated carbon adsorption device before being discharged.

[0030] Furthermore, the condensation recovery adopts a two-stage condensation process. The first stage uses room temperature water for cooling, and the second stage uses frozen brine at a temperature of -10°C for cooling, in order to recover the ethanol-water azeotrope in the exhaust gas.

[0031] Furthermore, the central collaborative controller has a built-in model prediction controller;

[0032] The model predictive controller is based on a multivariate predictive control model. In each control cycle, it performs rolling optimization with the goal of minimizing the weighted sum of the tracking error of the controlled variable and the increment of the control variable within a finite time domain in the future. It then solves the problem and issues the optimal control command to each actuator. The controlled variables include at least the discharge moisture content and the temperature in the middle of the drying chamber, and the control variables include at least the rotation speed of the dispersing disc and the temperature setpoint of each hot air zone.

[0033] Furthermore, in the physical form collaborative control step, the multivariate predictive control model used by the model predictive controller is an extended multivariate state-space model.

[0034] The extended model adds auxiliary observation values ​​reflecting the mixing state of the fluid in the drying chamber and the median particle size of the discharge as state variables, and adds the inner diameter setting of the grading ring and the tail gas recirculation ratio as control variables. Furthermore, the model predictive controller uses a recursive least squares method with a forgetting factor to update the parameters of the extended model online in real time.

[0035] This invention also discloses a rotary flash dryer for the production of mancozeb technical grade, including a central coordinating controller. The central coordinating controller is used to execute the control method for the rotary flash dryer for the production of mancozeb technical grade as described above, and further includes:

[0036] The reactor status monitoring module is installed inside the synthesis reactor and is connected to the central coordinating controller. It is configured to monitor the pH value, conductivity, turbidity and temperature of the reaction system in real time, and provide the central coordinating controller with data for determining the reaction endpoint.

[0037] A wet material closed conveying unit is connected between the reactor outlet and the rotary flash dryer inlet and is controlled by the central coordinating controller. It is configured to continuously and closedly convey the wet filter cake to the rotary flash dryer under nitrogen positive pressure protection after receiving the trigger command from the central coordinating controller.

[0038] The rotary flash dryer includes a vertically arranged drying chamber, a high-speed rotating dispersion disc disposed at the bottom of the drying chamber, and a hot air system that supplies hot air to the drying chamber.

[0039] The hot air temperature gradient control unit, as part of the hot air system, is connected to the central coordinating controller and is configured to form and independently control at least three hot air zones with different temperatures along the height direction in the drying chamber.

[0040] An online discharge moisture detection device is installed at the discharge port of the drying host and is connected to the central coordinating controller. It is configured to detect the moisture content of the discharge in real time.

[0041] The central coordinating controller is programmed to: trigger a conveying command based on the data from the reactor status monitoring module, dynamically adjust the rotation speed of the dispersing disc based on the feedback signal from the online discharge moisture detection device, and coordinate the control of the hot air temperature gradient regulation unit to maintain a preset temperature gradient.

[0042] Furthermore, the rotary flash dryer also includes:

[0043] A first-stage ring is adjustablely positioned at the upper part of the drying chamber;

[0044] An online particle size detection device is installed on the discharge path downstream of the grading ring and is connected to the central coordinating controller via signal.

[0045] The central coordinating controller is also programmed to dynamically adjust the inner diameter of the grading ring based on the feedback signal from the online particle size detection device to control the particle size distribution of the finished powder.

[0046] Furthermore, the high-speed rotating dispersion disk has a double-layer reverse blade structure, including an upper blade group and a lower blade group arranged coaxially. The upper blade group and the lower blade group are driven to rotate in opposite directions, and the blade mounting angle of the upper blade group is different from that of the lower blade group.

[0047] Furthermore, the blades of the upper blade group are installed at an angle of 30 degrees, and the blades of the lower blade group are installed at an angle of 45 degrees.

[0048] Furthermore, the system also includes an exhaust gas treatment and reuse unit, which includes a cyclone separator, a condensation recovery device, an online non-methane total hydrocarbon monitor, and a circulating fan connected in sequence.

[0049] The circulating fan is connected to the central coordinating controller and is configured to return a portion of the treated exhaust gas to the hot air system when the reading of the online non-methane total hydrocarbon monitor is lower than a set threshold.

[0050] Furthermore, the inner wall of the drying chamber is coated with a polytetrafluoroethylene anti-stick coating;

[0051] The hot air system includes a low-NOx burner equipped with an oxygen content sensor for monitoring and controlling the oxygen volume fraction in the flue gas.

[0052] Meanwhile, this invention also discloses a reaction vessel apparatus for the production of mancozeb technical, comprising:

[0053] Synthesis reactor;

[0054] A reactor status monitoring module is installed inside the synthesis reactor to monitor the pH value, conductivity, turbidity and temperature distribution of the reaction system in real time, and is connected to a central co-controller.

[0055] The reactor status monitoring module is configured to provide the real-time monitoring data to the central coordinating controller, so that the central coordinating controller can determine the reaction endpoint based on the preset endpoint criteria and trigger the downstream drying process.

[0056] Furthermore, the reactor status monitoring module includes:

[0057] The pH sensor employs a glass composite electrode structure.

[0058] The conductivity probe is a four-electrode type.

[0059] Turbidimeter, based on the principle of 90-degree scattered light;

[0060] The temperature array sensor consists of multiple platinum resistance thermometers arranged at equal intervals along the height of the synthesis reactor; the temperature array sensor consists of five platinum resistance thermometers.

[0061] Compared with the prior art, the present invention has the following beneficial effects:

[0062] This invention addresses the long-standing challenge of high-quality drying of heat-sensitive materials by systematically integrating continuous processes, gradient thermal fields, and multivariable collaborative control. It overcomes the limitations of traditional uniform high-temperature fields or static heat transfer by constructing a precisely controlled gradient temperature field along the material's trajectory within a dynamic drying chamber. This allows the material to sequentially undergo three distinct thermodynamic stages: rapid dehydration, gentle desorption, and low-temperature setting. This ensures that the core temperature of the material remains below a safe threshold, thereby protecting the chemical structural integrity of the active ingredients at the molecular level and improving the product's main content and color stability.

[0063] This invention achieves precise and stable control of moisture content by directly regulating the material residence time. A particle size control mechanism is integrated into the drying process, and a collaborative optimization algorithm dynamically balances the moisture removal and particle classification processes. This allows for the direct production of finished powder with extremely low moisture content and highly uniform particle size distribution in a single processing step, significantly improving the product's physical consistency and suitability for pharmaceutical processing.

[0064] This invention completely eliminates the risks of exposure, moisture absorption, and contamination of wet materials during transfer by intelligently identifying the reaction endpoint and triggering a seamless, closed-loop conveyor. With a central coordinating controller at its core, it achieves precise coordination of various functional units in time and space, integrating previously discrete and intermittent processes into a highly efficient and stable continuous process. This improves production efficiency and capacity, and ensures unparalleled batch-to-batch consistency.

[0065] This invention achieves on-demand distribution and tiered utilization of thermal energy through a gradient temperature field. Its innovative exhaust gas treatment and intelligent recycling unit can recover volatile solvents and reintroduce qualified exhaust gas waste heat into the system, forming an internal cycle of material and energy flow. This significantly reduces unit product energy consumption and waste gas emission load, achieving a balance between economic and environmental benefits. Attached Figure Description

[0066] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0067] Figure 1 This is a flowchart of the method described in this invention.

[0068] Figure 2 This is a schematic block diagram illustrating the process flow of the method of the present invention. Detailed Implementation

[0069] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the embodiments of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0070] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0071] Example 1: See Figure 1 and Figure 2 This embodiment discloses a rotary flash dryer for the production of mancozeb technical grade, including a central coordinating controller. The central coordinating controller is used to execute the control method for the rotary flash dryer for the production of mancozeb technical grade as described above, and further includes:

[0072] The reactor status monitoring module is installed inside the synthesis reactor and is connected to the central coordinating controller. It is configured to monitor the pH value, conductivity, turbidity and temperature of the reaction system in real time, and provide the central coordinating controller with data for determining the reaction endpoint.

[0073] A wet material closed conveying unit is connected between the reactor outlet and the rotary flash dryer inlet and is controlled by the central coordinating controller. It is configured to continuously and closedly convey the wet filter cake to the rotary flash dryer under nitrogen positive pressure protection after receiving the trigger command from the central coordinating controller.

[0074] The rotary flash dryer includes a vertically arranged drying chamber, a high-speed rotating dispersion disc disposed at the bottom of the drying chamber, and a hot air system that supplies hot air to the drying chamber.

[0075] The hot air temperature gradient control unit, as part of the hot air system, is connected to the central coordinating controller and is configured to form and independently control at least three hot air zones with different temperatures along the height direction in the drying chamber.

[0076] An online discharge moisture detection device is installed at the discharge port of the drying host and is connected to the central coordinating controller. It is configured to detect the moisture content of the discharge in real time.

[0077] The central coordinating controller is programmed to: trigger a conveying command based on the data from the reactor status monitoring module, dynamically adjust the rotation speed of the dispersing disc based on the feedback signal from the online discharge moisture detection device, and coordinate the control of the hot air temperature gradient regulation unit to maintain a preset temperature gradient.

[0078] Furthermore, the rotary flash dryer also includes:

[0079] A first-stage ring is adjustablely positioned at the upper part of the drying chamber;

[0080] An online particle size detection device is installed on the discharge path downstream of the grading ring and is connected to the central coordinating controller via signal.

[0081] The central coordinating controller is also programmed to dynamically adjust the inner diameter of the grading ring based on the feedback signal from the online particle size detection device to control the particle size distribution of the finished powder.

[0082] Furthermore, the high-speed rotating dispersion disk has a double-layer reverse blade structure, including an upper blade group and a lower blade group arranged coaxially. The upper blade group and the lower blade group are driven to rotate in opposite directions, and the blade mounting angle of the upper blade group is different from that of the lower blade group.

[0083] Furthermore, the blades of the upper blade group are installed at an angle of 30 degrees, and the blades of the lower blade group are installed at an angle of 45 degrees.

[0084] Furthermore, the system also includes an exhaust gas treatment and reuse unit, which includes a cyclone separator, a condensation recovery device, an online non-methane total hydrocarbon monitor, and a circulating fan connected in sequence.

[0085] The circulating fan is connected to the central coordinating controller and is configured to return a portion of the treated exhaust gas to the hot air system when the reading of the online non-methane total hydrocarbon monitor is lower than a set threshold.

[0086] Furthermore, the inner wall of the drying chamber is coated with a polytetrafluoroethylene anti-stick coating;

[0087] The hot air system includes a low-NOx burner equipped with an oxygen content sensor for monitoring and controlling the oxygen volume fraction in the flue gas.

[0088] In addition, this embodiment also discloses a control method for a rotary flash dryer used in the production of mancozeb technical grade. Its specific implementation relies on a central coordinating controller, which ensures the chemical structural integrity and physical property consistency of mancozeb technical grade during the drying process through a multi-parameter coupling feedback mechanism.

[0089] The central coordinating controller, serving as the core computing and scheduling unit, employs an industrial-grade programmable logic controller platform with a built-in real-time operating system and drying process knowledge base. The drying process knowledge base stores drying parameter combination templates trained based on historical batch data. Each template corresponds to a specific raw material batch number, reaction conditions, and target product specifications, defining the hot air distribution ratio, initial value of the dispersion disc rotation speed, set value of the grading ring opening, tail gas recovery rate benchmark, and target range for the output moisture content. Before each drying operation begins, the operator inputs the current batch's raw material batch number and target moisture range through the human-machine interface. The central coordinating controller automatically retrieves the matching initial parameter set and initializes the working status of each execution unit accordingly.

[0090] The reactor status monitoring module is deployed inside the synthesis reactor and includes a pH sensor, a conductivity probe, a turbidimeter, and a temperature array sensor. The pH sensor uses a glass composite electrode structure with a range of 0 to 14 and an accuracy of ±0.02 pH units; the conductivity probe is a four-electrode type with a measurement range of 0 to 200 mS / cm and a resolution of 0.1 μS / cm; the turbidimeter is based on the 90-degree scattering light principle and has a range of 0 to 4000 NTU; the temperature array sensor consists of five platinum resistance thermometers arranged at equal intervals along the height of the reactor, with a temperature measurement range of -50℃ to 200℃ and an accuracy of ±0.1℃.

[0091] The aforementioned sensors continuously collect the physicochemical parameter change curves of the reaction system at a sampling frequency of 1Hz and upload the data to the central coordinating controller in real time. When the pH value fluctuates within ±0.1 for 30 consecutive seconds and remains stable in the range of 7.8 to 8.2, the conductivity decreases at a rate of less than 0.5 mS / (cm·min), the turbidity value changes by less than 2% for 60 consecutive seconds and remains in the plateau period of 3500 to 3800 NTU, and the temperature difference between any two points in the temperature array does not exceed 1.5℃, the central coordinating controller determines that the reaction is complete and immediately outputs a wet material conveying trigger signal.

[0092] The wet material closed conveying unit is specifically a section of fully welded 316L stainless steel pipeline with an inner diameter of 80 mm and a wall thickness of 3 mm. It is protected by nitrogen positive pressure throughout, and the system pressure is maintained at a gauge pressure of 0.15 MPa. A pneumatic quick-opening valve is installed at the bottom of the reactor, with a response time of less than 0.5 seconds. When the wet material conveying command is issued, the quick-opening valve opens, and the nitrogen supply valve opens simultaneously, pushing the wet filter cake through the pipeline into the feed inlet of the rotary flash dryer at an average flow rate of approximately 1.2 m / s. The feed inlet is located on the upper side wall of the drying chamber and is equipped with a double-layer sealing gate to ensure that no air seeps in during the material entry process. The entire conveying process is completed within 30 seconds, and the moisture content of the wet filter cake is typically between 25% and 35%, with a temperature between 45°C and 55°C.

[0093] The rotary flash dryer is a vertical cylindrical structure, 6.8 meters high and 1.5 meters in inner diameter. The chamber is made of Q345R low-alloy steel, with an inner wall coated with a 65-micron thick polytetrafluoroethylene (PTFE) non-stick coating. Inside the main unit, from bottom to top, are a hot air distributor, a high-speed rotating dispersion disc, the main drying chamber, a grading ring, and a discharge zone. The hot air distributor, located at the bottom of the chamber, consists of an annular air duct and a perforated flow equalization plate. The flow equalization plate is made of 304 stainless steel, stamped with an opening ratio of 35% and a hole diameter of 2 mm. The holes are arranged in a concentric array, with a spacing of 25 mm between adjacent rings and an outermost diameter of 1300 mm. This structure ensures that hot air passes vertically upwards through the material bed at a uniform speed, with airflow velocity deviation controlled within ±5%, effectively eliminating local dead zones.

[0094] Hot air is supplied by a blower and heated by a hot air temperature gradient control unit. This unit comprises three independent heating branches (e.g., electric heaters, steam heat exchangers, or thermal oil heat exchangers), each equipped with a power regulator or flow control valve and a temperature feedback sensor. The central coordinating controller independently sets and controls the output of each of the three heating branches based on the estimated moisture content of the feed material, thereby independently and precisely controlling the temperature of the hot air delivered to the bottom, middle, and top of the drying chamber.

[0095] Under typical operating conditions, the hot air temperature in the bottom area is set at 180℃ for rapid evaporation of free water; the temperature in the middle area is set at 140℃ to prevent localized overheating that could break the molecular bonds of mancozeb; and the temperature in the top area is set at 90℃ to remove bound water and achieve initial cooling of the material. The temperature control accuracy for each area is ±2℃.

[0096] The high-speed rotating dispersion disc is installed on the central axis of the drying chamber and is driven by a variable frequency motor with a speed range of 800 to 2500 rpm.

[0097] The dispersion disk employs a double-layered, counter-rotating blade structure. The upper layer has eight blades with an inclination angle of 30 degrees, while the lower layer has six blades with an inclination angle of 45 degrees. The upper and lower layers rotate in opposite directions. This creates a counter-rotating turbulent flow field within the cavity, enhancing heat and mass transfer efficiency.

[0098] The material dispersion and mixing adjustment mechanism is integrated on the dispersion disc drive shaft, receiving speed commands from the central coordinating controller via a frequency converter. The online discharge moisture detection device is a near-infrared spectrometer, installed at the discharge screw outlet. The probe window is made of sapphire material, directly contacting the material flow. The near-infrared spectrometer acquires spectral data once per second, with a wavelength range of 900 to 1700 nm. It calculates the moisture content in real time using a partial least squares regression model, with a measurement range of 0.1% to 2.0% and an accuracy of ±0.03%. The central coordinating controller dynamically adjusts the dispersion disc speed based on this moisture value: when the measured moisture content is higher than the upper limit of the target value, the speed is reduced; when it is lower than the lower limit of the target value, the speed is increased. Changes in speed affect the hydrodynamic behavior of the material within the drying chamber. Lower speeds cause the material to move upwards in a denser state, resulting in a relatively longer residence time and deeper drying; higher speeds allow for more complete dispersion of the material, increasing the specific surface area per unit mass and accelerating the drying rate, but may shorten the overall residence time of some materials. This adjustment allows for stable control of the discharge moisture content. The specific adjustment amount (e.g., 50 rpm) can be configured according to process requirements.

[0099] The grading ring, located 4.2 meters above the top of the dispersion disc in the upper part of the drying chamber, is made of heat-resistant alloy steel and its inner diameter is electrically adjustable within the range of 800 to 1100 mm. The grading ring is driven by a servo motor with a response time of 2 seconds. The central co-controller instructs the servo motor to adjust the inner diameter of the grading ring based on online particle size monitoring data or historical batch trend predictions.

[0100] When the detected discharge particle size D90 exceeds 18 micrometers, the inner diameter is reduced by 20 millimeters; when D90 is below 15 micrometers, the inner diameter is increased by 20 millimeters to maintain the finished product particle size D90 within the range of 16 to 20 micrometers. The central coordinating controller employs a proportional control strategy, specifically adjusting the inner diameter of the grading ring. The deviation (mm) from the D90 measurement value relative to the target median (18 micrometers) (μm) proportional: ,in This is a proportionality coefficient, which takes the value of [value] in this embodiment. .

[0101] The trajectory of the material within the drying chamber is determined by centrifugal force, gravity, and airflow drag. Under the control strategy of this invention, the material undergoes three distinct stages: rapid dehydration, gentle desorption, and cooling and shaping.

[0102] The first stage occurs from near the dispersion plate to the middle of the cavity, and lasts for 4 / 9 of the total residence time;

[0103] The second stage is located in the upper part of the cavity, accounting for 3 / 9;

[0104] The third stage, from below the grading ring to the discharge port, accounts for 2 / 9 of the total area. Under these operating conditions, the average residence time of the material is approximately 10 seconds. By stabilizing the feed rate, hot air flow rate, and dispersing disc rotation speed, fluctuations in the average residence time can be controlled within a small range (e.g., ±10%). This time allocation ensures that moisture removal is completed below the thermal decomposition initiation temperature of mancozeb (approximately 210°C), avoiding loss of major components.

[0105] The discharge screw is located at the bottom conical section of the drying chamber, employing a twin-screw co-rotating structure. The screws are made of 316L stainless steel with a hardened surface. The screw pitch decreases from 120 mm to 60 mm along the conveying direction, achieving material compaction and sealed conveying. The discharge port connects to a sealed ton-bag packaging system, and the packaging process is carried out under a nitrogen protective atmosphere. The packaging system is equipped with an oxygen content monitor to detect the residual oxygen concentration inside the bag in real time, ensuring that the oxygen content is below 0.5% through nitrogen purging.

[0106] The exhaust gas composition analysis and reuse module is connected to the exhaust port at the top of the drying chamber. The exhaust gas first passes through a cyclone separator to remove entrained dust. The cyclone separator has a multi-tube parallel structure with a separation efficiency of over 99.5%. The gas then enters the condensation and recovery unit, which includes a primary water-cooled condenser (cooling water temperature 15℃) and a secondary chilled brine condenser (-10℃), condensing and recovering condensable solvents (mainly ethanol-water azeotropes) to a storage tank. The uncondensed gas enters an online non-methane total hydrocarbon monitor. This instrument uses flame ionization detection, has a range of 0 to 10000 ppm, and a response time of less than 30 seconds.

[0107] When the monitored value is below 500 ppm, the circulating fan starts, pressurizing a portion of the gas (e.g., 30-70% of the volumetric flow rate) and returning it to the inlet of the hot air system for waste heat utilization. The remaining portion is discharged into the plant's waste gas treatment system. When the monitored value exceeds 500 ppm, all gas is introduced into the activated carbon adsorption device, and after adsorption treatment, it meets emission standards. The circulating fan has an air volume of 3000 m³ / h and an outlet pressure of 0.05 MPa.

[0108] All actuators in the exhaust gas treatment and reuse unit are managed by a central coordinating controller to ensure environmental compliance and energy efficiency.

[0109] In one specific embodiment, the production of a batch of mancozeb technical grade was carried out using the control method described in this invention. The raw material batch number was DMZ-20231105, and the target moisture content range was 0.35% to 0.45%. The central coordinating controller retrieved the corresponding parameter template, initially setting the dispersion disc rotation speed to 1800 rpm, the bottom hot air temperature to 180°C, the middle to 140°C, the top to 90°C, the grading ring inner diameter to 950 mm, and the exhaust gas reuse rate to 70%.

[0110] The reactor status monitoring module monitors the reaction parameters in real time. When the parameters meet the preset endpoint criteria, the central coordinating controller immediately triggers a wet material conveying command. The wet filter cake has a moisture content of 31.2% and a temperature of 52℃.

[0111] During the drying process, the online moisture detection device detected that the moisture content rose to 0.48% at the 8th minute, and the central coordinating controller immediately reduced the speed of the dispersing disc to 1750 rpm; at the 12th minute, the moisture content dropped to 0.33%, and the speed was adjusted back to 1820 rpm. The final output moisture content stabilized at 0.41%, the main content was 86.7%, the particle size D90 was 18.3 micrometers, and the batch variation coefficient was 1.6%.

[0112] Comparative Example 1: The same batch of wet filter cake was processed using a traditional intermittent oven drying process. The oven temperature was set at 80℃, and the drying time was 8 hours. The average moisture content of the discharged product was [missing information]. The fluctuation range is (Right now to The main content averaged 83.2%, with some samples showing slight yellowing. The particle size D90 distribution was wide (15 to 28 micrometers), and the batch variation coefficient reached 4.8%. In addition, there was no exhaust gas recovery during the oven drying process, and all organic solvents were discharged into the waste gas system, resulting in energy consumption that was about 35% higher than that of the present invention.

[0113] Table 1 below summarizes the key performance indicators of Example 1 and Comparative Example 1:

[0114] Table 1:

[0115]

[0116] Furthermore, the central coordinating controller continuously compares actual operating data with the template's expected trajectory during the drying process. If any key parameter (such as discharge moisture content, hot air temperature, or exhaust gas concentration) deviates beyond the preset allowable bandwidth (e.g., moisture deviation exceeds ±0.05%), an adaptive correction algorithm is activated. This algorithm is based on a multivariate predictive control model and operates in each control cycle. The system aims to minimize the weighted sum of the squared errors between the predicted output and the setpoint over a finite future time domain, as well as the magnitude of the control increment. Rolling optimization is then performed to solve for and output the optimal control command for the current moment. The multivariate predictive control model is an input-output model obtained through system identification methods (such as step response testing), describing the dynamic relationship between controlled variables (discharge moisture content, temperature in the middle of the drying chamber, etc.) and control variables (dispersion disc rotation speed, hot air temperature setpoint, etc.). Prediction time domain. The typical value is 10 to 30 steps (corresponding to 50 to 150 seconds).

[0117] The controlled variables include at least the discharge moisture content and the temperature in the middle of the drying chamber, and the control variables include at least the rotation speed of the dispersing disc and the temperature setpoint of each hot air zone.

[0118] After solving the optimization problem, the controller recalculates the optimal hot air distribution ratio, the speed of the dispersion disc, and the exhaust gas recovery rate, and sends the results to each execution unit through the industrial bus protocol to achieve closed-loop adaptive adjustment.

[0119] The low-NOx burner in the combustion chamber employs staged combustion technology, with a primary air to secondary air ratio of 3:7. The flame temperature is controlled below 1100℃, and the NOx concentration in the flue gas is below 80mg / m³. The total flow rate of hot air entering the drying chamber after heat exchange is 4500m³ / h, and the air velocity is uniformly distributed across the chamber cross-section with a standard deviation of less than 0.3m / s.

[0120] The twin-screw structure of the discharge screw not only achieves sealed conveying but also generates back pressure through decreasing screw pitch, preventing the dried material from absorbing moisture during discharge due to a sudden drop in pressure. The ton bag packaging system is equipped with automatic weighing and sealing devices, with a net weight of 1000kg per bag and a packaging error of ±0.5kg.

[0121] The entire drying process, from reaction endpoint identification to finished product packaging, takes approximately 25 minutes, achieving truly continuous production. The central co-controller has operational data recording capabilities. Through the implementation of the above technical solutions, the drying process of mancozeb technical material achieves minimized thermal damage, precise moisture control, and a green production process, fully meeting the technical requirements of a main content of not less than 85%, a moisture content of not more than 0.5%, and a particle size D90 of not more than 20 micrometers, while significantly improving batch-to-batch consistency.

[0122] Example 2: This example is a further optimization based on Example 1. In this example, a grading ring subsystem is added: a grading ring with an electrically adjustable inner diameter between 800 mm and 1100 mm is installed below the cooling and shaping zone at the top of the drying chamber of the rotary flash dryer. An online laser particle size analyzer is installed on the discharge pipe after the grading ring to measure the particle size distribution (D10, D50, D90) of the powder in real time.

[0123] Modify the dispersion disc: Replace the original single-layer dispersion disc with a double-layer counter-rotating blade dispersion disc. The upper blades (8 blades, tilt angle 30 degrees) rotate in the same direction as the main shaft; the lower blades (6 blades, tilt angle 45 degrees) achieve counter-rotation with the main shaft through a planetary gearbox.

[0124] The hardware and software of the central coordinating controller are upgraded simultaneously to support the newly added state variables (turbulence intensity, particle size) and control variables (hierarchical loop inner diameter), and to run the extended multivariable model predictive control algorithm and co-optimization program.

[0125] Taking a typical control cycle (5 seconds) after the system enters the stable drying stage as an example, the collaborative workflow of the integrated control system is described:

[0126] Data Acquisition: The central coordinating controller synchronously acquires data from all sensors, including: online moisture meter reading (0.52%), three-zone wall temperature, exhaust gas non-methane total hydrocarbon concentration, online particle size analyzer reported D90 value (19.2 microns), and current dispersion disc rotation speed (1380 rpm) and grading ring inner diameter (948 mm).

[0127] Turbulence intensity estimation: The control system estimates the current rotational speed of the dispersion disk. Upper blade tilt angle Lower blade tilt angle Given known structural parameters such as blade dimensions, the built-in empirical model of turbulence intensity is used. The turbulence intensity value within the cavity is estimated in real time. (Dimensionless).

[0128] The constant 0.7 is the reduction factor for the contribution of the lower blade to the overall turbulence, which is determined by hydrodynamic simulation for this specific blade configuration.

[0129] in, These are the equipment structural constants related to the diameter of the dispersing disc, the blade width, and the diameter of the drying chamber. For the dispersing disc with a diameter of 800 mm and the drying chamber with an inner diameter of 1500 mm in this embodiment, calibration was performed through preliminary cold-mold experiments. The value is taken as 0.51. For equipment of other sizes, recalibration is required through corresponding experiments or simulations. In the calculation of this control cycle, the value is taken as... Estimate the current turbulence intensity value inside the cavity. (Dimensionless) is 0.51.

[0130] Collaborative optimization solution: The central collaborative controller invokes the collaborative optimization algorithm. The algorithm simultaneously considers the deviation between the current moisture value (0.52%) and the target value (0.5%), and the deviation between the current D90 value (19.2 micrometers) and the target value (18 micrometers), and calculates the optimal setpoint for the dispersion disc rotation speed (1345 rpm) and the setpoint for the grading ring inner diameter (942 mm) for this round with the goal of minimizing the fluctuation of the control variables.

[0131] Global Model Predictive Control Optimization: Using the above-mentioned collaborative optimization results as the desired input, the central collaborative controller runs the extended seven-variable model predictive control algorithm. This algorithm, based on an extended process model incorporating information such as turbulence intensity and particle size, predicts the system behavior for the next 30 seconds and performs global rolling optimization under all constraints, including moisture ≤0.5%, cavity temperature ≤185°C, exhaust emission compliance, and D90 ≤20 micrometers. The final output is a fine-tuned control command, for example: the dispersion disc rotation speed is ultimately set to 1305 rpm, the grading ring inner diameter is ultimately set to 938 mm, and the temperatures of each hot air zone are fine-tuned.

[0132] Command execution and model self-updating: Optimized control commands are issued to various actuators (frequency converters, servo motors, temperature control valves, etc.). Simultaneously, the system utilizes the actual operating data collected in this round to perform a micro-update on the key parameters of the internal prediction model through an online identification algorithm, enabling the model to adapt to slow changes in materials.

[0133] On an actual production line with a capacity of 2.5 tons / hour, the scheme of this embodiment was used to run continuously for 15 batches, and the data was compared with the historical batch data of Embodiment 1. The key indicators are compared as shown in Table 2 below:

[0134] Table 2:

[0135]

[0136] This embodiment, through closed-loop control of the grading ring, achieves effective control of the key particle size index (D90) of mancozeb powder directly in the drying process for the first time. The fluctuation range of D90 is reduced from several micrometers in traditional processes to within ±0.5 micrometers, producing powder with a uniform particle size distribution, meeting the requirements of high-end formulation processing and eliminating the need for subsequent pulverization and sieving processes. Simultaneously, the double-layered counter-rotating blade structure generates high-intensity turbulence, improving material mixing uniformity by over 35%, effectively eliminating localized overheating dead zones within the drying chamber, and reducing the risk of product thermal decomposition by approximately 75%. This is the fundamental reason for the improved and stable content of the main components.

[0137] This embodiment employs a two-layer optimization architecture combining a collaborative optimization function and extended multivariate predictive control to intelligently balance and simultaneously optimize multiple objectives such as moisture content, particle size, and energy consumption, achieving globally optimal control rather than local compromise. This makes it possible to simultaneously achieve efficient dehydration and precise shaping under strict thermal constraints.

[0138] Example 3: This example discloses a reaction vessel device for the production of mancozeb technical, including a synthesis reaction vessel and a reaction vessel status monitoring module. The reaction vessel status monitoring module is installed inside the synthesis reaction vessel and is used to monitor the pH value, conductivity, turbidity and temperature distribution of the reaction system in real time, and is connected to a central coordinating controller.

[0139] The reactor status monitoring module is configured to provide the real-time monitoring data to the central coordinating controller, so that the central coordinating controller can determine the reaction endpoint based on the preset endpoint criteria and trigger the downstream drying process.

[0140] Furthermore, the reactor status monitoring module includes:

[0141] The pH sensor employs a glass composite electrode structure.

[0142] The conductivity probe is a four-electrode type.

[0143] Turbidimeter, based on the principle of 90-degree scattered light;

[0144] The temperature array sensor consists of multiple platinum resistance thermometers arranged at equal intervals along the height of the synthesis reactor; the temperature array sensor consists of five platinum resistance thermometers.

[0145] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0146] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. It should be noted that any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method for a rotary flash dryer used in the production of mancozeb technical grade, characterized in that: The process is scheduled and executed by a central coordination controller, and includes the following steps: Continuous triggering and conveying steps: Real-time monitoring of pH value, conductivity, turbidity and temperature distribution in the synthesis reactor. When the monitoring data simultaneously meet the preset endpoint criteria, the wet material conveying command is immediately triggered, so that the wet filter cake after the reaction is completed is continuously fed into the feed port of the rotary flash dryer through a fully enclosed pipeline under nitrogen positive pressure protection. Gradient thermal field drying step: In the vertical drying chamber of the rotary flash dryer, three independently temperature-controlled hot air zones are established and maintained from bottom to top, namely the bottom high temperature zone, the middle medium temperature zone, and the top low temperature zone, wherein the hot air temperature of the bottom high temperature zone is higher than that of the top low temperature zone. Moisture closed-loop control steps: Real-time online detection of the moisture content of the dried material, and dynamic adjustment of the rotation speed of the dispersion disk in the drying chamber based on the deviation between the detected value and the target value, so as to change the dispersion degree, the throwing trajectory and the contact efficiency with hot air of the material, thereby indirectly affecting the residence time and drying intensity of the material in the effective drying area, and realizing closed-loop control of the moisture content of the discharged material.

2. The control method for the rotary flash dryer used in the production of mancozeb technical grade according to claim 1, characterized in that, The preset endpoint criterion is: The pH value fluctuates within the range of 7.8 to 8.2 for 30 consecutive seconds with a fluctuation range not exceeding ±0.1, the rate of decrease in conductivity is less than 0.5 mS / (cm·min), the rate of change of turbidity value within the range of 3500 to 3800 NTU for 60 consecutive seconds is less than 2%, and the maximum temperature difference between measuring points at different heights in the reactor does not exceed 1.5℃.

3. The control method for the rotary flash dryer used in the production of mancozeb technical grade according to claim 1, characterized in that: In the continuous triggering and conveying step, the nitrogen gauge pressure in the fully enclosed pipeline is maintained at 0.15 MPa, the conveying velocity of the wet filter cake is 1.2 m / s, and the time from the triggering of the command to the complete entry of the wet material into the dryer does not exceed 30 seconds.

4. The control method for the rotary flash dryer used in the production of mancozeb technical grade according to claim 1, characterized in that: In the gradient thermal drying step, the hot air temperature in the bottom high-temperature zone is set to 180℃±2℃, the hot air temperature in the middle medium-temperature zone is set to 140℃±2℃, and the hot air temperature in the top low-temperature zone is set to 90℃±2℃. The hot air in the bottom high-temperature zone, the middle medium-temperature zone, and the top low-temperature zone is supplied by a main hot air source, and the temperature of each zone is precisely controlled in a closed loop by independent temperature control devices and temperature sensors installed on the air inlet ducts of each zone.

5. The control method for the rotary flash dryer used in the production of mancozeb technical grade according to claim 1 or 4, characterized in that: The hot air supplying heat to the drying chamber is generated by a low-NOx burner, which uses an oxygen content sensor to control the oxygen volume fraction in the combustion flue gas in a closed loop between 3% and 5%; the inner wall of the drying chamber is coated with a polytetrafluoroethylene anti-stick coating with a thickness of 50 to 80 micrometers.

6. The control method for the rotary flash dryer used in the production of mancozeb technical grade according to claim 1, characterized in that: In the closed-loop moisture control step, a near-infrared spectroscopy analyzer is used to perform real-time online detection of the moisture content. The detection probe directly contacts the material flow, the sampling frequency is not less than 1Hz, and the moisture measurement accuracy is ±0.03%. The specific method for dynamically adjusting the rotation speed of the dispersion disk is as follows: When the detected moisture content is higher than the upper limit of the target value, reduce the rotation speed; when the detected moisture content is lower than the lower limit of the target value, increase the rotation speed.

7. The control method for a rotary flash dryer used in the production of mancozeb technical grade according to claim 1 or 6, characterized in that: The dispersing disc has a double-layer counter-rotating blade structure, with the upper and lower blades rotating in opposite directions. The upper blades are installed at an angle of 30 degrees, and the lower blades are installed at an angle of 45 degrees. The rotational speed of the dispersing disc is continuously adjustable within the range of 800 to 2500 rpm via a frequency converter.

8. The control method for the rotary flash dryer used in the production of mancozeb technical grade according to claim 1, characterized in that: It also includes physical form coordination control steps: Particle size closed-loop control steps: A grading ring with an electrically adjustable inner diameter is installed in the upper part of the drying chamber, and the particle size distribution of the discharged powder is detected online in real time; the central coordinating controller dynamically adjusts the inner diameter of the grading ring according to the deviation between the detected 90% cumulative particle size D90 value and the target range, so as to achieve closed-loop control of the finished product particle size.

9. A rotary flash dryer for the production of mancozeb technical grade, comprising a central coordinating controller, the central coordinating controller being used to execute the control method for the rotary flash dryer for the production of mancozeb technical grade according to any one of claims 1-8, characterized in that, Also includes: The reactor status monitoring module is installed inside the synthesis reactor and is connected to the central coordinating controller. It is configured to monitor the pH value, conductivity, turbidity and temperature of the reaction system in real time, and provide the central coordinating controller with data for determining the reaction endpoint. A wet material closed conveying unit is connected between the reactor outlet and the rotary flash dryer inlet and is controlled by the central coordinating controller. It is configured to continuously and closedly convey the wet filter cake to the rotary flash dryer under nitrogen positive pressure protection after receiving the trigger command from the central coordinating controller. The rotary flash dryer includes a vertically arranged drying chamber, a high-speed rotating dispersion disc disposed at the bottom of the drying chamber, and a hot air system that supplies hot air to the drying chamber. The hot air temperature gradient control unit, as part of the hot air system, is connected to the central coordinating controller and is configured to form and independently control at least three hot air zones with different temperatures along the height direction in the drying chamber. An online discharge moisture detection device is installed at the discharge port of the drying host and is connected to the central coordinating controller. It is configured to detect the moisture content of the discharge in real time. The central coordinating controller is programmed to: trigger a conveying command based on the data from the reactor status monitoring module, dynamically adjust the rotation speed of the dispersing disc based on the feedback signal from the online discharge moisture detection device, and coordinate the control of the hot air temperature gradient regulation unit to maintain a preset temperature gradient.

10. A reaction vessel apparatus for the production of mancozeb technical grade, characterized in that, It includes a synthesis reactor and a reactor status monitoring module. The reactor status monitoring module is installed inside the synthesis reactor and is used to monitor the pH value, conductivity, turbidity and temperature distribution of the reaction system in real time, and is connected to a central co-controller. The reactor status monitoring module is used to provide the real-time monitoring data to the central coordinating controller, so that the central coordinating controller can determine the reaction endpoint according to the preset endpoint criteria and trigger the downstream drying process.

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