Humidification control of platinum channel kiln with wet membrane evaporation cooling system

Abstract

The application provides a wet membrane evaporation cooling system for humidity control of a platinum channel kiln, which comprises a wet membrane treatment module, a water supply regulation module, a heat energy recovery module, a sensing detection module, a control module and an airflow conveying module; the sensing detection module is in communication connection with the control module; the control module is in communication connection with the wet membrane treatment module, the water supply regulation module, the heat energy recovery module and the airflow conveying module respectively; and the water supply regulation module is in pipeline connection with the wet membrane treatment module. The application replaces traditional decentralized control by establishing the core logic of intelligent decision and module linkage of the sensing detection and control module, realizes full-process automation of humidity regulation and control, and guarantees response timeliness from the structure; the integrated design of the wet membrane treatment module, the heat energy recovery module and the water supply regulation module solves the functional limitation of a single module, realizes the integration of humidification, energy saving and water quality protection, and reduces system energy consumption and maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of liquid crystal glass substrate processing equipment, specifically to a wet film evaporation cooling system for humidity control in a platinum channel furnace. Background Technology

[0002] As a core piece of equipment in the production of high-precision products such as ultra-thin glass and optical glass, the stability of the internal humidity of platinum tunnel kilns directly affects the product forming quality, light transmittance, and finished product qualification rate. Therefore, precise control of the humidity inside the kiln is achieved through professional humidity control devices. The wet film evaporative cooling system for humidity control in platinum tunnel kilns is a specialized device specifically adapted to the operating conditions of platinum tunnel kilns. It integrates functions such as wet film humidification, cooling, heat recovery, water quality protection, and intelligent control. Its core function is to achieve airflow humidification and cooling through wet film evaporation. Combined with multi-module collaborative operation, it replaces traditional manual or single control methods, achieving fully automated and precise control of kiln humidity throughout the entire process. Simultaneously, it balances energy saving and stable equipment operation, providing reliable humidity environment support for the efficient production of platinum tunnel kilns. It has indispensable application value in high-end manufacturing industries such as glass manufacturing.

[0003] Currently, in the field of humidity control for platinum channel kilns, wet film evaporation technology has gradually replaced traditional dry steam humidification technology, and the existing wet film evaporative cooling systems are showing a diversified development trend. Some existing systems achieve basic humidification functions through a single wet film module and a simple water supply device, using ordinary water pumps to deliver tap water to the wet film, relying on natural evaporation or simple fans to deliver airflow, thus achieving initial humidity regulation in the kiln. Other systems add simple sensors and control units, allowing for manual or semi-automatic adjustment of water supply flow and fan speed, initially improving the convenience of humidity control. A few high-end systems are equipped with separate water filtration modules or heat recovery components, attempting to improve wet film scaling problems or reduce energy consumption. Meanwhile, in existing technologies, the wet film material is mostly a single ceramic fiber membrane or PP membrane, water supply regulation largely relies on fixed flow control, and heat recovery is mostly in a constantly open mode. Overall, it is in a stage of "single function superposition" development and has not yet formed an integrated collaborative architecture. This leads to the following shortcomings in the actual use of wet film evaporative cooling systems: Most wet film evaporative cooling systems lack the core logic of intelligent decision-making and module linkage for sensing and control modules. Existing systems mostly adopt a decentralized control mode, with modules such as wet film treatment, water supply regulation, airflow conveying, and heat recovery operating independently without a unified intelligent decision-making center. The adjustment of operating parameters of each module lacks coordination, requiring manual intervention for process connection and parameter adjustment. This makes it impossible to achieve full automation of humidity control, resulting in lag in response and difficulty in quickly adapting to real-time fluctuations in kiln humidity. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a wet film evaporative cooling system for humidity control in platinum channel kilns, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A wet film evaporative cooling system for humidity control in a platinum channel kiln includes a wet film treatment module, a water supply regulation module, a heat recovery module, a sensing and detection module, a control module, and an airflow conveying module. The sensing and detection module is communicatively connected to the control module. The control module is communicatively connected to the wet film treatment module, the water supply regulation module, the heat recovery module, and the airflow conveying module. The water supply regulation module is connected to the wet film treatment module via pipeline. The heat recovery module is connected in series in the air duct of the airflow conveying module. The wet film treatment module is composed of a ceramic fiber honeycomb membrane and a PP microporous membrane, and is used to realize the evaporative humidification and cooling of airflow. The water supply control module is used to supply purified water with a stable flow rate to the wet film treatment module and dynamically adjust the thickness of the water film. The heat recovery module is used to recover waste heat from the kiln exhaust and preheat the fresh air to be treated. The sensing and detection module is used to collect real-time data on temperature and humidity inside the kiln, fresh air temperature, water film thickness, and water quality parameters. The control module is used to analyze sensor detection data and output module operation control commands. The airflow delivery module is used to uniformly deliver the airflow processed by the wet film treatment module into the kiln.

[0006] Furthermore: the specific data acquisition process of the sensing and detection module is as follows: Temperature and humidity data: The temperature and humidity values ​​inside the kiln are collected every 1 second by a high-precision temperature and humidity sensor installed inside the kiln. Fresh air temperature data: The fresh air temperature is collected every 2 seconds by a temperature sensor installed at the air duct inlet; Water film thickness data: The water film thickness is collected every 3 seconds using an ultrasonic sensor installed on the surface of the wet film treatment module; Water quality data: The water turbidity value is collected every 5 seconds by an online turbidity sensor installed in the water supply pipeline.

[0007] Furthermore, the specific structural parameters of the wet film treatment module are as follows: The porosity of ceramic fiber honeycomb membranes is 85-90%, while the pore size of PP microporous membranes is 0.2-0.4 μm. The total thickness of the composite membrane is 150-200 mm, and the surface is coated with a polytetrafluoroethylene anti-scaling coating with a thickness of 5-10 μm.

[0008] Furthermore: the specific control process of the water supply control module is as follows: Initial state: The control module controls the variable frequency water pump to start according to the kiln humidity setting value, with an output flow rate of 8-10L / h, so that the water film thickness reaches 0.2mm; Dynamic adjustment: When the water film thickness detected by the sensor module is <0.2mm, the control module controls the variable frequency water pump to increase the output flow rate; when the water film thickness is >0.4mm, the output flow rate is reduced. Water quality linkage: When the water turbidity is ≥5 NTU, the control module controls the variable frequency water pump to shut down, starts the drain valve to drain water, and triggers the backwashing process of the water purification module at the same time.

[0009] Furthermore: the water purification module is connected in series with the inlet pipe of the water supply control module, and the specific processing flow is as follows: The raw water is filtered and purified by the water purification module; the resistivity of the purified water is ≥15MΩ・cm, which meets the water quality requirements for wet membrane evaporation. The backwash pump starts every 24 hours, with a backwash time of 5-10 minutes. Water supply is automatically restored after the backwash is completed.

[0010] Furthermore, the specific operation process of the heat recovery module is as follows: When the fresh air temperature is <25℃: the control module controls the kiln exhaust to be turned on and the waste heat is recovered to preheat the fresh air through the finned heat exchanger; When the fresh air temperature is ≥25℃: the control module shuts off the heat recovery path, and the fresh air directly enters the wet membrane treatment module; Heat exchanger protection: When the sensing module detects a pressure difference of ≥50Pa between the inlet and outlet of the heat exchanger, the control module triggers a cleaning alarm.

[0011] Furthermore, the specific decision-making process of the control module is as follows: S1: Receives real-time data from the sensor detection module and uses the LSTM temperature and humidity prediction model to predict the kiln humidity change trend 5-10 minutes in advance. S2: Humidity setpoint deviation analysis: When the actual humidity of the kiln is less than the set value -2%RH, increase the water supply flow and increase the fan speed. When the actual humidity of the kiln exceeds the set value and 2%RH, reduce the water supply flow and lower the fan speed. S3: Anti-condensation control: When the outlet air temperature is less than the dew point temperature, the PTC ceramic electric auxiliary heating module is activated, and the heating is carried out in stages until the dew point temperature and 2°C are reached, and then it is turned off. S4: Operating mode switching: Pure wet film cooling mode is used in summer; combined heat pump heating and wet film humidification mode is used in winter.

[0012] Furthermore: the specific operation process of the airflow delivery module is as follows: The control module adjusts the airflow speed of the air delivery module based on the humidity deviation value. When the humidity deviation is ≤2%RH, the wind speed should be maintained at 0.8-1.0m / s; When the humidity deviation is 2-5% RH, adjust the wind speed to 1.2-1.5 m / s; When the humidity deviation is greater than 5%RH, adjust the wind speed to 1.5-1.8m / s.

[0013] Furthermore, it also includes a water collection module and an alarm module. The bottom of the wet film treatment module is equipped with a water collection module, and the lowest point of the water collection module is connected to the return pipe. The return pipe is equipped with a flow sensor. When the return flow rate is less than 30% of the supply flow rate, the control module determines that the wet film is blocked, the alarm module is activated, triggers an audible and visual alarm and prompts for cleaning.

[0014] Furthermore: the control module is equipped with a ModbusTCP remote communication interface, which can be networked with the kiln central control system, and includes the following functions; Real-time uploading includes, but is not limited to, kiln temperature and humidity, fresh air temperature, water film thickness, water turbidity, and equipment operating status; Supports remote operation via mobile or PC to adjust humidity settings, start / stop equipment, and view fault records; It can identify eight types of faults, including water pump failure, fan failure, sensor abnormality, and heat exchanger blockage, and provides dual alarms through local audible and visual alarms and remote terminals.

[0015] This invention provides a wet film evaporative cooling system for humidity control in platinum channel kilns. Compared with existing technologies, it has the following advantages: 1. Establish the core logic of intelligent decision-making and module linkage of sensing and control modules to replace traditional decentralized control, realize full automation of humidity regulation, and ensure timely response from a structural perspective; the integrated design of wet film treatment module, heat recovery module and water supply regulation module solves the functional limitations of single module, realizes humidification, energy saving and water quality protection in one, and reduces system energy consumption and maintenance costs. 2. The control module acts as the central hub, linking with other modules to achieve a dynamic closed loop of data acquisition, analysis, decision-making, and execution adjustment. This ensures that parameters such as water supply flow, wind speed, and heat recovery match the kiln's humidity requirements, thereby improving control accuracy and system stability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram illustrating the working principle of the present invention is shown; The diagram shows: 1. Wet film treatment module; 2. Water supply control module; 3. Heat recovery module; 4. Control module; 5. Primary filter; 6. Sensor detection module; 7. Preheating coil; 8. Medium-efficiency filter; 9. Airflow conveying module. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0019] To address the technical problems in the background section, the following wet film evaporative cooling system for humidity control in platinum channel kilns is provided: Combination Figure 1 As shown, the wet film evaporative cooling system for humidity control of platinum channel kiln provided by the present invention includes a wet film treatment module 1, a water supply regulation module 2, a heat energy recovery module 3, a sensing and detection module 6, a control module 4, and an airflow conveying module 9, wherein the airflow conveying module 9 is equipped with a primary filter 5, a secondary filter 8, and a preheating coil 7. The sensing and detection module is communicatively connected to the control module. The control module is communicatively connected to the wet film treatment module, the water supply regulation module, the heat recovery module, and the airflow conveying module. The water supply regulation module is connected to the wet film treatment module via pipeline. The heat recovery module is connected in series in the air duct of the airflow conveying module. The wet film treatment module is composed of a ceramic fiber honeycomb membrane and a PP microporous membrane, and is used to realize the evaporative humidification and cooling of airflow. The water supply control module is used to deliver a stable flow of purified water to the wet film treatment module and dynamically adjust the thickness of the water film. The water supply control module uses a variable frequency water pump. The heat recovery module is used to recover waste heat from the kiln exhaust and preheat the fresh air to be treated. The sensing and detection module is used to collect real-time data on temperature and humidity inside the kiln, fresh air temperature, water film thickness, and water quality parameters. The control module is used to analyze sensor detection data and output module operation control commands. The airflow conveying module is used to uniformly convey the airflow processed by the wet film treatment module into the kiln. The airflow conveying module adopts a brushless DC inverter fan.

[0020] The above solution establishes the core logic of intelligent decision-making and module linkage in sensing and control modules, replacing traditional decentralized control to achieve full automation of humidity regulation and structurally ensure timely response. The integrated design of the wet film treatment module, heat recovery module, and water supply regulation module solves the functional limitations of a single module, realizing the integration of humidification, energy saving, and water quality protection, reducing system energy consumption and maintenance costs. The control module acts as the central hub, linking the other modules to achieve a dynamic closed loop of data acquisition, analysis, decision-making, and execution of adjustments, ensuring that parameters such as water flow, wind speed, and heat recovery match the humidity requirements of the kiln, improving control accuracy and system stability.

[0021] In this embodiment, the specific data acquisition process of the sensing and detection module is as follows: Temperature and humidity data: The high-precision temperature and humidity sensor installed inside the kiln collects the temperature and humidity values ​​inside the kiln every 1 second. The humidity measurement range is 30-80%RH, and the temperature measurement range is 20-60℃. Fresh air temperature data: The fresh air temperature is collected every 2 seconds by a temperature sensor at the air duct inlet; Water film thickness data: The water film thickness is collected every 3 seconds using an ultrasonic sensor installed on the surface of the wet film treatment module; Water quality data: The water turbidity value is collected every 5 seconds by an online turbidity sensor in the water supply pipeline. The above solution specifies the dedicated collection equipment and collection cycle for the four core parameters, forming a differentiated process of high-frequency collection of key parameters and on-demand collection of auxiliary parameters, ensuring high data fidelity and no redundancy; the kiln temperature and humidity are collected every 1 second and the water film thickness is collected every 3 seconds, accurately capturing real-time fluctuations of parameters, providing high-frequency data input for the intelligent decision-making module, and shortening the decision response time from the process perspective.

[0022] In this embodiment, the specific structural parameters of the wet film treatment module are as follows: The ceramic fiber honeycomb membrane has a porosity of 85-90%, and the PP microporous membrane has a pore size of 0.2-0.4μm. The two are composited using a high-temperature resistant epoxy resin adhesive. The composite membrane consists of 3-5 layers along the airflow direction, with the humidification channels of adjacent layers staggered by 60°. The channel cross-section is a regular hexagon with an inner diameter of 8-12mm. The total thickness of the composite membrane is 150-200mm, and the surface is coated with a polytetrafluoroethylene anti-scaling coating with a thickness of 5-10μm. In this design, the pore size of the ceramic fiber honeycomb membrane is limited. By optimizing the porosity and pore size of the PP microporous membrane, the permeability and hydrophilicity of the membrane structure are improved, thereby enhancing evaporation efficiency. A design with a total composite membrane thickness of 150-200 mm and a 5-10 μm PTFE anti-scaling coating on the surface structurally reduces the risk of scaling and clogging, extends the service life of the wet membrane, and lowers maintenance frequency. Furthermore, the multi-layered composite structure provides structural support for uniform airflow and stable water film formation. Combined with flow regulation from the water supply control module, this improves humidification uniformity and prevents localized humidity deviations in the kiln.

[0023] In this embodiment, the specific control process of the water supply control module is as follows: Initial state: The control module controls the variable frequency water pump to start according to the kiln humidity setting value, which is 40-70%RH, and outputs a flow rate of 8-10L / h to make the water film thickness reach 0.2mm. Dynamic adjustment: When the water film thickness detected by the sensor module is <0.2mm, the control module controls the variable frequency water pump to increase the output flow rate, with a maximum output flow rate of 18L / h; when the water film thickness is >0.4mm, the output flow rate is reduced, with a minimum output flow rate of 8L / h. Water quality linkage: When the water turbidity is ≥5 NTU, the control module controls the variable frequency water pump to shut down, starts the drain valve to drain water, and simultaneously triggers the backwash process of the water purification module. In the above scheme, the quantitative setting of the initial flow rate and the target water film thickness ensures that the water film forms quickly and stabilizes at the optimal thickness when the system starts up, providing a basis for evaporative humidification. Utilizing the dynamic adjustment logic of increasing the flow rate when the water film thickness is <0.2mm and decreasing the flow rate when the water film thickness is >0.4mm, a closed-loop control is formed to maintain the water film thickness within the optimal range of 0.2-0.4mm, ensuring stable evaporation efficiency and avoiding insufficient or excessive humidification. When the water turbidity is ≥5 NTU, the control module controls the variable frequency water pump to shut down, starts the drain valve to drain water, and simultaneously triggers the backwash process of the water purification module, effectively preventing contact between inferior water and the wet film, protecting the wet film from scaling and clogging, and ensuring the continuous and stable operation of the system.

[0024] In this embodiment, the water purification module is connected in series in the inlet pipe of the water supply control module. The water purification module includes a quartz sand filter, an activated carbon filter, and an RO reverse osmosis membrane connected in series. The filtration accuracy of the quartz sand filter is 5-10 μm, the iodine adsorption value of the activated carbon filter is ≥1000 mg / g, and the rejection rate of the RO reverse osmosis membrane is ≥99%. The specific treatment process is as follows: The raw water passes through a quartz sand filter, an activated carbon filter, and an RO reverse osmosis membrane in sequence; the resistivity of the purified water is ≥15MΩ・cm, which meets the water quality requirements for wet membrane evaporation. Automatic backwashing: The backwash pump starts every 24 hours, with a backwashing time of 5-10 minutes. After the backwashing is completed, the water supply is automatically restored. In the above solution, by setting a water purification module, impurities, organic matter and ions in the water are removed to ensure that the resistivity of the outlet water is ≥15MΩ・cm, thus preventing wet membrane scaling from the source. In addition, the setting of automatic backwashing for 5-10 minutes every 24 hours does not require manual intervention, which promptly cleans the impurities trapped by the filter, maintains the purification efficiency, extends the service life of the filter, and reduces maintenance costs.

[0025] In this embodiment, the specific operation process of the heat recovery module is as follows: When the fresh air temperature is <25℃: the control module controls the kiln exhaust air to be turned on and pass through the finned heat exchanger. The finned heat exchanger is made of 304L stainless steel with corrugated fins and a spacing of 10-12mm. The waste heat is recovered and the fresh air is preheated through the preheating coil 7 with a preheating efficiency of ≥65%. When the fresh air temperature is ≥25℃: the control module shuts off the heat recovery path, and the fresh air directly enters the wet membrane treatment module; Heat exchanger protection: When the sensing module detects a pressure difference ≥ 50Pa between the inlet and outlet of the heat exchanger, the control module triggers a cleaning alarm. In the above scheme, a fresh air temperature of 25℃ is used as the threshold to achieve automatic switching of the heat recovery path. In winter, exhaust waste heat is recovered to preheat fresh air, and in summer, ineffective energy consumption is avoided, thereby improving the system's energy efficiency from a process perspective. The structural design of the finned heat exchanger series air duct maximizes the recovery of exhaust waste heat, reduces the heating load of the heat pump, and further reduces energy consumption. The protection mechanism that triggers a cleaning alarm when the pressure difference between the inlet and outlet of the heat exchanger is ≥ 50Pa promptly detects blockage problems, avoids a decrease in heat exchange efficiency and equipment damage, extends the service life of the heat recovery module, and ensures long-term stable operation of the system.

[0026] In this embodiment, the specific decision-making process of the control module is also as follows: S1: Receives real-time data from the sensor detection module and uses the LSTM temperature and humidity prediction model to predict the kiln humidity change trend 5-10 minutes in advance. S2: Humidity setpoint deviation analysis: When the actual humidity of the kiln is less than the set value -2%RH, increase the water supply flow and increase the fan speed. When the actual humidity of the kiln exceeds the set value and 2%RH, reduce the water supply flow and lower the fan speed. S3: Anti-condensation control: When the outlet air temperature is less than the dew point temperature, the PTC ceramic electric auxiliary heating module is activated, and the heating is carried out in stages until the dew point temperature and 2°C are reached, and then it is turned off. S4: Operating Mode Switching: In summer, a pure wet film cooling mode is used; in winter, a combined heat pump heating and wet film humidification mode is used. Specifically, when the ambient temperature is ≥28℃, it is summer mode; when the ambient temperature is <15℃, it is winter mode. In the above scheme, the LSTM temperature and humidity prediction model predicts trends 5-10 minutes in advance, shifting decision-making from passive response to proactive prediction, adjusting parameters in advance to avoid increasing humidity deviation and improve control accuracy. A graded adjustment logic of deviation ≤2%RH / 2-5%RH / >5%RH is used to precisely match water supply flow and air velocity, ensuring dynamic adaptation of humidification capacity to kiln requirements and maintaining humidity fluctuations within ±2%RH. When the outlet air temperature is <dew point temperature, PTC electric auxiliary heating is activated to prevent condensation from the process and protect the kiln equipment. The differentiated operating modes for summer and winter adapt to the temperature and humidity requirements of different seasons, balancing energy saving and humidification effects, and improving system adaptability.

[0027] In this embodiment, the specific operation process of the airflow delivery module is as follows: The control module adjusts the fan speed of the brushless DC inverter fan based on the humidity deviation value. When the humidity deviation is ≤2%RH, the wind speed should be maintained at 0.8-1.0m / s; When the humidity deviation is 2-5% RH, adjust the wind speed to 1.2-1.5 m / s; When the humidity deviation is greater than 5% RH, adjust the wind speed to 1.5-1.8 m / s; In this embodiment, the air duct outlet can be equipped with a perforated flow equalization plate with a hole diameter of 5-8mm and an opening rate of ≥60% to ensure that the air outlet uniformity error is ≤5%, avoiding uneven humidity distribution in the kiln. In the above scheme, the wind speed is set according to the humidity deviation to achieve matching between wind speed and humidification: when the deviation is large, the wind speed is increased to speed up the humidification response; when the deviation is small, the wind speed is maintained at a low speed to save energy. Furthermore, the wind speed is linked with the graded adjustment logic of the intelligent decision module to form a closed loop of humidity deviation, wind speed, and humidification, ensuring that the humidity uniformity error in the kiln is ≤5%. Dynamic wind speed adjustment avoids the energy waste caused by fixed wind speed, and in conjunction with the heat recovery module, further improves the overall energy-saving effect of the system.

[0028] In this embodiment, a water collection module and an alarm module are also included. The bottom of the wet film treatment module is provided with a water collection module, and the lowest point of the water collection module is connected to the return pipe. The water collection module is made of 304 stainless steel water collection tray, and the bottom of the water collection tray is inclined at 1-2°. The lowest point is connected to the return pipe. The alarm module is an audible and visual alarm. A flow sensor is installed on the return pipe. When the return flow rate is less than 30% of the supply flow rate, the control module determines that the wet film is blocked, triggers an audible and visual alarm and prompts for cleaning. The inner wall of the water collection tray is coated with an anti-corrosion coating to prevent long-term water accumulation from damaging the equipment. In the above solution, the structural design of the water collection module at the bottom of the wet membrane recovers unevaporated water, reducing water waste and preventing equipment corrosion caused by water accumulation. The flow sensor on the return pipe, combined with the quantitative judgment standard of return flow, accurately identifies wet membrane blockage, replacing manual inspection and improving the timeliness of fault detection. The audible and visual alarm function of the alarm module triggers a prompt when blockage occurs, preventing system overload operation, protecting the wet membrane and water pump equipment, and reducing maintenance costs.

[0029] In this embodiment, the control module is equipped with a ModbusTCP remote communication interface, which can be networked with the kiln central control system; Real-time uploaded data includes: kiln temperature and humidity, fresh air temperature, water film thickness, water turbidity, and equipment operating status; Supports remote operation: Adjust humidity settings, start and stop equipment, and view fault records via mobile or PC. Fault diagnosis function: It can identify eight types of faults, including water pump failure, fan failure, sensor abnormality, and heat exchanger blockage. It provides dual alarms through local audible and visual alarms and remote terminals. The system also has a storage module that automatically stores fault records for one year. In the above implementation, the Modbus TCP remote communication interface enables networking with the kiln central control system and mobile / PC terminals, supporting real-time data upload and remote operation, improving the convenience of operation and maintenance. The system clearly defines the identification of eight types of faults and uses a dual mechanism of local audible and visual alarms combined with remote terminal alarms to ensure timely fault response. The automatic storage of fault records for one year provides data support for fault tracing and system optimization, reduces long-term operation and maintenance costs, and improves system maintainability.

[0030] Working principle and usage process of this invention: When using: The system can be started manually or in conjunction with the kiln central control system. The control module reads preset parameters: kiln humidity setting value 40-70%RH, threshold for adjusting to summer or winter operation mode according to temperature value, and dew point temperature reference for anti-condensation. After system startup, it runs continuously, collecting data according to a set cycle; a high-precision temperature and humidity sensor collects data every 1 second, with a measurement range of humidity 30-80%RH and temperature 20-60℃; an air duct inlet temperature sensor collects data every 2 seconds, providing a basis for switching the heat recovery module; water film thickness: an ultrasonic sensor on the surface of the wet film treatment module collects data every 3 seconds to monitor the real-time thickness of the water film; water quality parameters: an online turbidity sensor in the water supply pipeline collects data every 5 seconds to determine the water cleanliness; these high-frequency collected multi-dimensional parameters are transmitted to the control module in real time. Receive real-time data from the sensor detection module and perform decision analysis at a frequency of 1 second / time; predict the kiln humidity change trend 5-10 minutes in advance through the LSTM temperature and humidity prediction model; Humidity deviation analysis: Deviation ≤ 2%RH: Maintain current water supply flow and fan speed; Deviation 2-5%RH: Adjust water supply flow and fan speed to 1.2-1.5m / s; Deviation > 5%RH: Further adjust water supply flow and increase fan speed to 1.5-1.8m / s; Calculate the outlet dew point temperature. If the outlet temperature is < dew point temperature, start the 1-3kW PTC ceramic electric auxiliary heating module, heat up to the dew point temperature and 2℃, and then automatically shut off. During this period, when the ambient temperature is ≥28℃: switch to pure wet film cooling mode and turn off the heat recovery module; when the ambient temperature is <15℃: switch to heat pump heating combined with wet film humidification mode and turn on the heat recovery module; water supply flow adjustment command, fan speed adjustment command, electric auxiliary heating start / stop command, and heat recovery path switching command are transmitted to the corresponding execution module respectively. The control module generates control commands: Wet membrane treatment module: The composite membrane structure receives the water supply and forms a 0.2-0.4mm water film, which humidifies and cools the airflow through evaporation; the polytetrafluoroethylene coating on the surface of the composite membrane prevents scaling, and the 3-5 layers of staggered 60° channels improve the uniformity of evaporation; Water supply control module: Initial state: The variable frequency water pump operates at an output flow rate of 8-10L / h, and the water film thickness is stable at 0.2mm; Dynamic adjustment: Based on the water film thickness data, increase or decrease the flow rate and maintain the water film thickness at 0.2-0.4 mm; Water quality linkage: If the turbidity is ≥5 NTU, immediately shut off the water pump, start the drain valve to drain the water, and trigger the water purification module to backwash; During this period, when the variable frequency water pump is inlet, the raw water passes through a quartz sand filter, an activated carbon filter, and an RO reverse osmosis membrane to achieve an outlet water resistivity of ≥15MΩ・cm; and during this period, the backwash pump is started every 24 hours, and water supply is restored after backwashing for 5-10 minutes. When the fresh air temperature is <25℃, the control module controls the kiln exhaust to be turned on and preheat the fresh air through the finned heat exchanger; when the fresh air temperature is ≥25℃, the control module controls the heat recovery path to be turned off and the fresh air directly enters the wet film treatment module; and if the pressure difference between the inlet and outlet of the heat exchanger is ≥50Pa, a cleaning alarm is triggered to achieve the protection effect. During this period, the brushless DC inverter fan adjusts the wind speed according to the command to maintain the air pressure at 500-800Pa; the multi-hole flow equalization plate at the air duct outlet ensures that the air uniformity error is ≤5%, and delivers the treated airflow to the kiln at a uniform speed. During this period, the air circulation allows the air to be filtered by the primary filter and the medium-efficiency filter 8 to improve the air cleanliness. During evaporative cooling, the water collection pan of the water collection module collects unevaporated water and returns it through the return pipe; if the return flow rate is less than 30% of the water supply flow rate, it is determined that the wet film is blocked and an audible and visual alarm is triggered; after humidification and cooling, the uniform airflow enters the platinum channel kiln, and the humidity inside the kiln gradually approaches the set value. During this period, the sensing module monitors the deviation between the actual humidity of the kiln and the set value in real time and feeds the data back to the control module. The control module dynamically adjusts the control commands based on the deviation value, repeats the decision-making and execution process, and maintains the humidity fluctuation range of the kiln within ±2%RH and the temperature fluctuation within ±1.0℃. If any abnormal parameters occur, the control module immediately triggers fault diagnosis and outputs the results: continuously optimized control commands or fault alarm signals. The system synchronizes status data in real time during operation and automatically triggers alarms when a fault occurs. The control module uploads kiln temperature and humidity, equipment operating status, and water quality data to the kiln central control system, mobile terminals, and PC terminals via the Modbus TCP interface. It supports remote adjustment of humidity setpoints, starting and stopping equipment, and viewing historical data. When pump, fan, or other common faults are detected, a dual alarm is triggered via a local audible and visual alarm and a remote terminal. Fault records are automatically stored for one year. The system achieves real-time monitoring of data, remote control response, and fault alarm information.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wet film evaporative cooling system for humidity control in a platinum channel kiln, characterized in that: It includes a wet film treatment module, a water supply control module, a heat recovery module, a sensing and detection module, a control module, and an airflow delivery module; The sensing and detection module is communicatively connected to the control module. The control module is communicatively connected to the wet film treatment module, the water supply regulation module, the heat recovery module, and the airflow conveying module. The water supply regulation module is connected to the wet film treatment module via pipeline. The heat recovery module is connected in series in the air duct of the airflow conveying module. The wet film treatment module is composed of a ceramic fiber honeycomb membrane and a PP microporous membrane, and is used to realize the evaporative humidification and cooling of airflow. The water supply control module is used to supply purified water with a stable flow rate to the wet film treatment module and dynamically adjust the thickness of the water film. The heat recovery module is used to recover waste heat from the kiln exhaust and preheat the fresh air to be treated. The sensing and detection module is used to collect real-time data on temperature and humidity inside the kiln, fresh air temperature, water film thickness, and water quality parameters. The control module is used to analyze sensor detection data and output module operation control commands. The airflow delivery module is used to uniformly deliver the airflow processed by the wet film treatment module into the kiln.

2. The wet film evaporative cooling system for humidity control in a platinum channel kiln according to claim 1, characterized in that: The specific data acquisition process of the sensing and detection module is as follows: Temperature and humidity data: The temperature and humidity values ​​inside the kiln are collected every 1 second by a high-precision temperature and humidity sensor installed inside the kiln. Fresh air temperature data: The fresh air temperature is collected every 2 seconds by a temperature sensor installed at the air duct inlet; Water film thickness data: The water film thickness is collected every 3 seconds using an ultrasonic sensor installed on the surface of the wet film treatment module; Water quality data: The water turbidity value is collected every 5 seconds by an online turbidity sensor installed in the water supply pipeline.

3. The wet film evaporative cooling system for humidity control in a platinum channel kiln according to claim 2, characterized in that: The specific structural parameters of the wet film treatment module are as follows: The porosity of ceramic fiber honeycomb membranes is 85-90%, while the pore size of PP microporous membranes is 0.2-0.4 μm. The total thickness of the composite membrane is 150-200 mm, and the surface is coated with a polytetrafluoroethylene anti-scaling coating with a thickness of 5-10 μm.

4. The wet film evaporative cooling system for humidity control in a platinum channel kiln according to claim 3, characterized in that: The specific control process of the water supply control module is as follows: Initial state: The control module controls the variable frequency water pump to start according to the kiln humidity setting value, with an output flow rate of 8-10L / h, so that the water film thickness reaches 0.2mm; Dynamic adjustment: When the water film thickness detected by the sensor module is <0.2mm, the control module controls the variable frequency water pump to increase the output flow rate; when the water film thickness is >0.4mm, the output flow rate is reduced. Water quality linkage: When the water turbidity is ≥5 NTU, the control module controls the variable frequency water pump to shut down, starts the drain valve to drain water, and triggers the backwashing process of the water purification module at the same time.

5. The wet film evaporative cooling system for humidity control in a platinum channel kiln according to claim 4, characterized in that: The water purification module is connected in series with the inlet pipe of the water supply control module, and the specific processing flow is as follows: The raw water is filtered and purified by the water purification module; the resistivity of the purified water is ≥15MΩ・cm, which meets the water quality requirements for wet membrane evaporation. The backwash pump starts every 24 hours, with a backwash time of 5-10 minutes. Water supply is automatically restored after the backwash is completed.

6. The wet film evaporative cooling system for humidity control in a platinum channel kiln according to claim 5, characterized in that: The specific operation process of the heat recovery module is as follows: When the fresh air temperature is <25℃: the control module controls the kiln exhaust to be turned on and the waste heat is recovered to preheat the fresh air through the finned heat exchanger; When the fresh air temperature is ≥25℃: the control module shuts off the heat recovery path, and the fresh air directly enters the wet membrane treatment module; Heat exchanger protection: When the sensing module detects a pressure difference of ≥50Pa between the inlet and outlet of the heat exchanger, the control module triggers a cleaning alarm.

7. The wet film evaporative cooling system for humidity control in a platinum channel kiln according to claim 6, characterized in that: The specific decision-making process of the control module is also included: S1: Receives real-time data from the sensor detection module and uses the LSTM temperature and humidity prediction model to predict the kiln humidity change trend 5-10 minutes in advance. S2: Humidity setpoint deviation analysis: When the actual humidity of the kiln is less than the set value -2%RH, increase the water supply flow and increase the fan speed. When the actual humidity of the kiln exceeds the set value and 2%RH, reduce the water supply flow and lower the fan speed. S3: Anti-condensation control: When the outlet air temperature is less than the dew point temperature, the PTC ceramic electric auxiliary heating module is activated, and the heating is carried out in stages until the dew point temperature and 2°C are reached, and then it is turned off. S4: Operating mode switching: Pure wet film cooling mode is used in summer; combined heat pump heating and wet film humidification mode is used in winter.

8. The wet film evaporative cooling system for humidity control in a platinum channel kiln according to claim 7, characterized in that: The specific operation process of the airflow delivery module is as follows: The control module adjusts the airflow speed of the air delivery module based on the humidity deviation value. When the humidity deviation is ≤2%RH, the wind speed should be maintained at 0.8-1.0m / s; When the humidity deviation is 2-5% RH, adjust the wind speed to 1.2-1.5 m / s; When the humidity deviation is greater than 5%RH, adjust the wind speed to 1.5-1.8m / s.

9. The wet film evaporative cooling system for humidity control in a platinum channel kiln according to claim 8, characterized in that: It also includes a water collection module and an alarm module. The bottom of the wet film treatment module is equipped with a water collection module, and the lowest point of the water collection module is connected to the return pipe. The return pipe is equipped with a flow sensor. When the return flow rate is less than 30% of the supply flow rate, the control module determines that the wet film is blocked, the alarm module is activated, triggers an audible and visual alarm and prompts for cleaning.

10. The wet film evaporative cooling system for humidity control in a platinum channel kiln according to claim 9, characterized in that: The control module is equipped with a ModbusTCP remote communication interface, which can be connected to the kiln central control system, and includes the following functions; Real-time uploading includes, but is not limited to, kiln temperature and humidity, fresh air temperature, water film thickness, water turbidity, and equipment operating status; Supports remote operation via mobile or PC to adjust humidity settings, start / stop equipment, and view fault records; It can identify eight types of faults, including water pump failure, fan failure, sensor abnormality, and heat exchanger blockage, and provides dual alarms through local audible and visual alarms and remote terminals.

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