Food workshop dust concentration monitoring and dust removing system

Abstract

The invention relates to the technical field of industrial environment monitoring and control, in particular to a food workshop dust concentration monitoring and dust removal system which comprises a central controller, an environment sensing unit, an integrated optical probe, a frequency conversion dust removal module, a graded self-cleaning gas circuit unit and a dew point protection bypass gas supply module. The central controller obtains relative humidity and collects scattered light intensity and transmission light intensity; when the scattered light intensity is greater than a preset alarm threshold value and the relative humidity is greater than a preset high-risk threshold value, the central controller intercepts an acceleration instruction and controls the probe to heat; and when the transmission light intensity is lower than a preset cleaning threshold value, the central controller controls to execute the ash removal action of heating baking and parallel blowing of the hot air curtain, and selectively executes the ash removal action of vertical impact of high-pressure airflow. Through thermal decoupling and energy efficiency interlocking control, the problem of irreversible bag pasting caused by probe misinformation and condensation phase change under the high-humidity glycolipid working condition can be solved.

Description

Technical Field

[0001] This application relates to the technical field of industrial environmental monitoring and control, and in particular to a dust concentration monitoring and dust removal system for food processing workshops. Background Technology

[0002] Dust concentration monitoring and dust control in industrial production processes are crucial for ensuring workshop safety and environmental compliance. In the food processing sector, such as baking, sugar powder, and milk powder production lines, the workshop environment is highly unique and complex. Food processing often involves the release of large amounts of high-temperature steam, resulting in persistently high humidity in certain areas of the workshop. Simultaneously, the airborne dust particles are rich in sugar and oil content. This specific "high humidity, high sugar, high fat" gas-solid multiphase flow environment gives the dust strong adhesion and a tendency for phase change. Therefore, effectively monitoring dust concentration and ensuring the long-term stable operation of dust removal systems under extreme conditions such as in food processing workshops, preventing pipeline failure and explosion-proof safety hazards caused by rapid dust accumulation, has always been a fundamental application problem that urgently needs to be solved in engineering practice in this field.

[0003] A search revealed Chinese invention patent publication number CN119075510A, which discloses an intelligent temperature-controlled environmental dust removal device. This device includes a dust collector and an execution module. The dust collector has a temperature control mechanism, a dehumidification mechanism (such as a drying chamber with a heat-conducting filter), and a sulfide concentration control mechanism installed at the air inlet of the bag filter to pre-treat the flue gas. Its core operating logic is as follows: the system pre-obtains the maximum operating humidity of the dust collector at a set operating temperature and acquires the actual humidity of the flue gas in real time during operation. When the flue gas humidity is detected to be greater than this maximum operating humidity, the system automatically activates the pre-installed dehumidification mechanism to dehumidify the flue gas and negatively adjusts the gas flow rate based on the humidity difference. This prior art mainly relies on open-loop pre-treatment intervention at the front end, attempting to control the humidity of the gas entering the bag filter within the maximum operating humidity range, thereby avoiding condensation on the filter bag surface to a certain extent, aiming to reduce cleaning resistance and extend the service life of the filter bags.

[0004] However, the aforementioned existing technologies reveal a core problem of system dynamic instability caused by the interference between physical and meteorological conditions and mechanical actions when dealing with the extreme mixed conditions in food processing workshops. Specifically, tiny condensed water mists in food workshops easily become deeply encapsulated by viscous sugar and lipid dust, forming complex water-powder multiphase aerosols. Existing technologies, relying solely on front-end sensors for single-dimensional physical quantity threshold monitoring, cannot effectively eliminate probe monitoring artifacts caused by water mist encapsulation. This easily leads to misjudging high-humidity aerosols as high-concentration dust, frequently triggering erroneous mechanical responses in the dust removal system. A more fatal flaw lies in the fact that existing technologies rely solely on pre-positioned static humidification at the air inlet, completely detaching their operational logic from the dynamic state feedback of the filter bags at the dust removal end during actual suction. When the dust removal system suctions the high-humidity mixture rich in sugar and lipids at full speed, the sudden increase in flow velocity and sudden drop in pressure within the pipes instantly disrupt the original thermodynamic equilibrium, easily causing the local airflow temperature to drop below the dew point. Once initial condensation occurs on the filter bag surface, the highly viscous sugar and lipid dust rapidly undergoes a mud-like phase transition and becomes deeply embedded in the filter bag pores. Due to a lack of combined closed-loop perception of the system's actual suction efficiency and local thermodynamic state, the mechanical actuators will blindly maintain or increase the suction negative pressure when encountering extreme anomalies such as a surge in resistance. This uncontrolled mechanical action not only fails to achieve dust removal but also produces a reverse destructive effect similar to physical compaction. It forcibly squeezes the originally muddy soft scale and, accompanied by condensation and cooling, solidifies it into an irreversible, stubborn hard shell. Ultimately, this leads to permanent physical blinding of the filter media micropores and extremely severe bag clogging, completely rendering the system's dust removal function ineffective. Summary of the Invention

[0005] In order to solve the problem of false alarms by probes and irreversible bag clogging caused by condensation phase change under high humidity sugar and lipid conditions through thermal decoupling and energy efficiency interlocking control, this application provides a dust concentration monitoring and dust removal system for food workshops.

[0006] The dust concentration monitoring and dust removal system for food workshops provided in this application adopts the following technical solution: The dust concentration monitoring and dust removal system for food workshops includes a central controller, an environmental sensing unit, an integrated optical probe, a frequency conversion dust removal module, a graded self-cleaning air path unit, and a dew point protection bypass air replenishment module. The central controller acquires the relative humidity of the environmental sensing unit and collects the scattered light intensity and transmitted light intensity of the integrated optical probe. When the intensity of the scattered light exceeds a preset alarm threshold and the relative humidity exceeds a preset high-risk threshold, the central controller intercepts the acceleration command of the variable frequency dust removal module and controls the integrated optical probe to heat up; if the intensity of the scattered light still exceeds the preset alarm threshold after a set heating time, the acceleration command is triggered. When the transmitted light intensity is lower than the preset cleaning threshold, the central controller controls the graded self-cleaning air path unit to perform heating and baking and hot air curtain parallel blowing cleaning actions on the integrated optical probe in sequence, and selectively performs high-pressure airflow vertical impact cleaning action based on the recovery state of the transmitted light intensity. When the acceleration command is executed, if the output power of the variable frequency dust removal module increases and generates a power increment, the decrease in the intensity of the scattered light is lower than the preset decrease threshold, and the relative humidity is greater than the preset high-risk threshold, the central controller locks its operating frequency and controls the dew point protection bypass air supply module to inject hot dry air.

[0007] Optionally, the integrated optical probe is equipped with an adaptive temperature-controlled heating ring; The central controller controls the heating of the integrated optical probe by activating the adaptive constant temperature heating loop; If the intensity of the scattered light falls below the preset alarm threshold before the heating set time is reached, the central controller determines that it is a false positive caused by water mist condensation, maintains the interception state of the acceleration command, and shuts down the adaptive constant temperature heating ring.

[0008] Optionally, when performing the dust removal action of heating and baking, the central controller activates the adaptive constant temperature heating ring and continuously monitors the transmitted light intensity; When the transmitted light intensity stops decaying, and within a preset de-adhesion time threshold, the fluctuation range of the transmitted light intensity is lower than a preset fluctuation threshold, the central controller determines that the dirt has been converted into a dry and loose state. Once the determination is successful, the central controller maintains the adaptive constant temperature heating ring open and controls the graded self-cleaning air path unit to perform the dust removal action of parallel blowing of the hot air curtain.

[0009] Optionally, after the parallel blowing of the hot air curtain has been completed, the central controller obtains the current transmitted light intensity. If the current transmitted light intensity is still lower than the preset transmission recovery threshold, the central controller determines that there is stubborn hard dirt.

[0010] Optionally, the graded self-cleaning air path unit includes a low-pressure thermal laminar flow generator and a high-pressure pulse backflush air manifold; When performing the parallel blowing cleaning action of the hot air curtain, the central controller starts the low-pressure hot laminar flow generator to output the hot air curtain, which laterally blows away the dirt in a dry and loose state to block the condensation phase change.

[0011] Optionally, the central controller completes the dust removal action of the parallel blowing of the hot air curtain as a prerequisite for triggering the high-pressure pulse back-flushing air bag. When the aforementioned preconditions are met and the presence of the stubborn scale is determined, the central controller determines that the stubborn scale has completed moisture evaporation and solidification. Based on this determination, the central controller controls the graded self-cleaning air circuit unit to perform the high-pressure airflow vertical impact cleaning action, so as to trigger the high-pressure pulse backflush air bag to output a single airflow to break up the stubborn hard scale.

[0012] Optionally, when executing the acceleration command, the central controller compares the power increment of the variable frequency dust removal module with the decrease in scattered light intensity to calculate the drag efficiency factor; When the resistance efficiency factor is greater than the preset efficiency threshold and the relative humidity is greater than the high-risk threshold, the central controller determines that mud-like micro-blockage has occurred. Based on this determination, the central controller prohibits increasing the locked operating frequency, controls the dew point prevention bypass air supply module to inject the hot dry air proportionally through a preset proportional regulating valve, and simultaneously outputs a high humidity bag clogging warning message to trigger the workshop production line to reduce production capacity.

[0013] Optionally, after the injected hot dry air reaches a preset time threshold, the central controller recalculates the current drag efficiency factor. If the current resistance efficiency factor is still greater than the preset efficiency threshold, the central controller determines that the thermal reversal of the mud micro-blockage has failed. Based on this determination, the central controller forcibly shuts down the variable frequency dust removal module, closes the fireproof and explosion-proof valves of the system, and simultaneously outputs a manual cleaning alarm.

[0014] Optionally, the environmental sensing unit is configured inside the main pipe of the variable frequency dust removal module and collects the current gas temperature; The central controller calculates the local dew point temperature based on the relative humidity and the current gas temperature; During the process of injecting the hot dry air in proportion, the central controller compares the current gas temperature with the local dew point temperature to obtain the dynamic temperature difference; When the dynamic temperature difference is lower than the preset temperature difference threshold, the central controller increases the opening of the proportional control valve until the dynamic temperature difference reaches or exceeds the preset temperature difference threshold.

[0015] Optionally, when the dynamic temperature difference reaches or exceeds the preset temperature difference threshold, and the state continues for a preset stable time threshold, the central controller recalculates the current resistance efficiency factor. If the current resistance efficiency factor falls below the preset efficiency threshold, the central controller determines that the mud-like micro-blockage has been successfully reversed; Based on the determination, the central controller controls the proportional regulating valve to gradually reduce its opening until it closes to stop injecting the hot dry air, simultaneously unlocks the operating frequency, and outputs a self-recovery signal to trigger the workshop production line to resume normal production capacity.

[0016] In summary, this application includes the following beneficial technical effects: 1. This application effectively solves the core problem of irreversible bag clogging caused by condensation phase change under high humidity and sugar-lipid conditions through thermal decoupling and energy efficiency interlock control. When the system executes acceleration commands, it compares the power increment of the variable frequency dust removal module with the decrease in scattered light intensity to calculate the resistance efficiency factor, thereby accurately identifying early signs of micro-clogging of the filter bag. After determining micro-clogging, the central controller locks the operating frequency and controls the dew point backup bypass air supply module to dynamically inject hot dry air in proportion. By sensing the dynamic temperature difference between the local airflow temperature and the local dew point temperature through closed-loop sensing, the condensation conditions on the filter bag surface are blocked from the root, successfully reversing the slurry phase change process and completely eliminating the safety hazards of system paralysis and explosion-proof problems.

[0017] 2. This application precisely eliminates the false positive detection defect caused by artifacts in water-powder multiphase aerosols through a timing-nested judgment logic. When the system detects excessive dust concentration and high humidity, the central controller actively intercepts the acceleration command of the variable frequency dust removal module and activates the constant temperature heating ring of the integrated optical probe for thermal verification. This control method of thermal verification before dust removal effectively avoids frequent erroneous suction responses triggered by condensed water mist being mistaken for high-concentration dust, reduces the ineffective idling of the variable frequency dust removal module, and prevents the risk of disrupting the thermodynamic balance within the pipeline due to blind suction.

[0018] 3. This application completely solves the permanent blinding defect in the optical path caused by alternating hot and cold phase change curing at the cleaning end through a graded and controlled self-cleaning action. When the transmitted light intensity is lower than the cleaning threshold, the system controls the graded self-cleaning air path unit to sequentially perform heating and baking followed by parallel blowing with a hot air curtain, causing the moisture on the wet, sticky, high-sugar-lipid soft deposits on the lens surface to evaporate and transform into a dry, loose state that is then blown away laterally. Only when stubborn hard deposits are determined to exist and have completed moisture evaporation and solidification will the system trigger a high-pressure airflow for vertical impact cleaning. This progressive mechanism avoids physical compaction caused by direct impact of high-pressure airflow on wet, sticky soft deposits, ensuring long-term transparency of the lens optical path and stable and reliable detection accuracy. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the system topology and physical layout of this application. Detailed Implementation

[0020] The following combination Figure 1 This application will be described in further detail.

[0021] This application discloses a dust concentration monitoring and removal system for food processing workshops. This system is applied to industrial environmental monitoring and dust control scenarios in food processing workshops, and is particularly suitable for extreme working conditions such as baking, sugar powder, and milk powder processing, where high-temperature steam release occurs and dust is rich in sugar and oil, resulting in high humidity and high viscosity.

[0022] This system relies on a hardware architecture consisting of a central controller, an environmental sensing unit, an integrated optical probe, a variable frequency dust removal module, a graded self-cleaning air path unit, and a dew point backup bypass air supply module. Through time-series nested judgment logic, graded controlled execution actions, and closed-loop control involving multiple physical quantities, it specifically addresses three core technical defects in existing technologies. The first defect is false positives caused by water-powder multiphase aerosol artifacts at the monitoring end. Existing technologies only monitor single-dimensional physical quantity thresholds, failing to eliminate monitoring artifacts caused by water mist encapsulation, frequently triggering erroneous mechanical responses in the dust removal system. The second defect is permanent optical path blinding caused by refrigerant phase change solidification at the cleaning end. Existing technologies use high-pressure cold air direct blowing for dust removal, which compacts and solidifies the high-humidity sugar-lipid deposits on the lens surface into a stubborn hard shell, causing irreversible damage to the optical path. The third type is the irreversible bag clogging defect caused by exposure point puncture at the actuator end. Existing technology relies on open-loop static humidity control at the air inlet end, which is detached from the dynamic state feedback at the dust removal end. Blindly increasing the suction negative pressure will aggravate the mud-like phase change on the surface of the filter bag, causing system paralysis and explosion-proof safety hazards.

[0023] First, based on the overall technical goals of this system for high-humidity, high-sugar, and high-fat conditions in food workshops, we completed the physical construction and electrical connection of all hardware modules of the system, and completed the calibration and threshold setting of the basic operating parameters of the system. This provides a standardized hardware foundation and a unified data judgment benchmark for the entire system to achieve thermal decoupling and energy efficiency interlocking control.

[0024] The central controller employs an industrial-grade programmable logic controller (PLC). It is installed within the central control cabinet of the food processing workshop. The central controller establishes a system-wide communication link via industrial Ethernet, employing the Modbus TCP / IP protocol to establish bidirectional signal transmission with environmental sensing units, integrated optical probes, variable frequency dust removal modules, graded self-cleaning air path units, and dew point backup bypass air supply modules. The central controller connects to the control terminals of each actuator via digital output interfaces and collects real-time data from each sensing unit via analog input interfaces, enabling real-time acquisition of system operating data and synchronous issuance of execution commands.

[0025] The environmental sensing unit employs an integrated temperature and humidity transmitter. The relative humidity measurement accuracy of the environmental sensing unit is no less than ±2%RH, and the temperature measurement accuracy is no less than ±0.2℃. The environmental sensing unit is fixedly installed inside the main duct of the variable frequency dust removal module, positioned 3m in front of the module's air inlet. The sampling surface of the environmental sensing unit faces the airflow direction within the main duct, and it collects the relative humidity and current temperature of the gas within the main duct in real time.

[0026] Figure 1 The overall hardware architecture and spatial layout of the dust concentration monitoring and removal system in the food processing workshop are showcased. A central controller serves as the core, connecting various units via Ethernet or digital / analog interfaces. The airflow direction is clearly marked on the main duct. The environmental sensing unit (including temperature and humidity probes) and the integrated optical probe are installed on the same cross-section of the main dust removal duct, located 3 meters in front of the variable frequency dust removal module's air inlet. The dew point backup bypass air supply module is connected to the main duct, with the connection point located 2 meters forward of the integrated optical probe's air inlet side. A graded self-cleaning air path unit provides low-pressure thermal laminar flow and high-pressure pulse backflushing air sources, respectively, connected to the integrated optical probe.

[0027] The integrated optical probe employs a laser backscattering dust detection method. The integrated optical probe's detection range covers 0.1 mg / m³. 3 Up to 1000 mg / m 3 The probe incorporates a factory-calibrated linear correlation curve between scattered light intensity and dust concentration, allowing direct calculation of the corresponding dust concentration value from real-time collected scattered light intensity. The integrated optical probe integrates a light emitter, a transmitted light receiver, and a scattered light receiver. An adaptive temperature-controlled heating ring is embedded around the probe's lens. This ring uses a toroidal semiconductor heating element, with a heating power range of 0W to 50W and a temperature control accuracy of at least ±1℃. The central controller uses PID closed-loop temperature control logic to dynamically adjust the output power based on real-time temperature data from the heating ring, maintaining the set target heating temperature. The heating surface of the adaptive constant temperature heating ring is completely fitted to the back of the lens. The adaptive constant temperature heating ring is embedded in the metal flange along the edge of the lens. The installation position of the adaptive constant temperature heating ring does not obstruct the receiving optical path of transmitted and scattered light. The integrated optical probe is fixedly installed in the main pipe of the frequency conversion dust removal module. The integrated optical probe and the environmental sensing unit are in the same pipe cross section. The detection window of the probe faces the airflow direction in the main pipe. The integrated optical probe collects the scattered light intensity and transmitted light intensity of dust in the detection area in real time. The installation design of the same cross section can ensure the spatiotemporal consistency of humidity detection data and optical detection data, and eliminate the detection deviation caused by the difference in sensor installation position.

[0028] The variable frequency dust collection module includes a variable frequency fan, a bag filter, and fire and explosion-proof valves. The rated airflow of the variable frequency fan covers 1.2 times the maximum dust generation in the workshop, and the operating frequency adjustment range of the variable frequency fan is 0Hz to 50Hz. The bag filter uses polyester fiber needle-punched felt filter bags, suitable for the dust filtration needs of food workshops. Fire and explosion-proof valves are installed at both ends of the bag filter's inlet and outlet. The control terminals of the fire and explosion-proof valves are connected to the digital output interface of the central controller, receiving opening and closing commands from the central controller, and can realize emergency closure of the pipeline. The variable frequency dust collection module receives commands from the central controller and completes the dust collection and suction action at the corresponding frequency.

[0029] The graded self-cleaning air circuit unit includes a low-pressure thermal laminar flow generator and a high-pressure pulse backflush air manifold. The low-pressure thermal laminar flow generator and the high-pressure pulse backflush air manifold use independent air supply circuits. The low-pressure thermal laminar flow generator has a built-in PTC heating wire, and its output hot air temperature ranges from 30℃ to 80℃. The temperature control terminal of the low-pressure thermal laminar flow generator is connected to the central controller, receiving temperature setting commands from the central controller to achieve precise control of the hot air temperature. The laminar flow nozzle of the low-pressure thermal laminar flow generator adopts an annular slit structure. The width of the annular slit is 0.2mm. The laminar flow nozzle is positioned close to the lens surface of the integrated optical probe, and the laminar flow nozzle outputs a hot air curtain parallel to the lens surface. The rated operating pressure of the high-pressure pulse backflush air manifold is 0.6MPa. The pulse nozzle of the high-pressure pulse backflush air manifold is positioned directly opposite the center of the lens, with an angle of 30° between the pulse nozzle and the lens surface, and a mounting distance of 50mm between the pulse nozzle and the lens surface. The pulse nozzle outputs a high-pressure airflow that vertically impacts the lens surface. Both the low-pressure thermal laminar flow generator and the high-pressure pulse backflush air manifold establish a signal connection with the central controller through independent solenoid valves. The low-pressure thermal laminar flow generator and the high-pressure pulse backflush air manifold receive instructions from the central controller and execute corresponding actions. The independent air path design can avoid pressure interference between the two airflows and ensure the accuracy and controllability of the dust removal action.

[0030] The dew point protection bypass air supply module is installed at the front end of the main duct of the variable frequency dust removal module, 2 meters from the air inlet side of the environmental sensing unit. This installation position ensures that the injected hot dry air is fully mixed with the original gas in the duct before passing through the environmental sensing unit and integrated optical probe, ensuring that the detection data accurately reflects the true state of the mixed gas. The air inlet of the dew point protection bypass air supply module is connected to the workshop's independent electric heating dehumidifier unit, and the air outlet of the dew point protection bypass air supply module is connected to the main duct through a proportional regulating valve. The opening range of the proportional regulating valve is 0% to 100%, and the adjustment accuracy of the proportional regulating valve is not less than 1%. The proportional regulating valve establishes a signal connection with the central controller, and the proportional regulating valve receives instructions from the central controller to complete the corresponding opening of the hot dry air injection action.

[0031] All thresholds are determined based on the characteristics of high humidity, high sugar, and high fat conditions in food processing workshops, relevant national standards, the thermodynamic properties of food materials, and the accuracy requirements of equipment operation, taking into account both the safety and stability of system operation and the precision of detection and control.

[0032] The preset alarm threshold is set to a dust concentration of 10 mg / m³ corresponding to the intensity of scattered light. 3 This value is determined based on the dust concentration limit requirements in GB 14881-2013 General Hygiene Standard for Food Production. It also matches the occupational health and safety limits for food production workshops with the warning margin for dust explosion prevention. The alarm threshold is set at 2.5 times the occupational exposure limit for food dust, taking into account both safety warnings and the need to avoid frequent false alarms. This threshold is used to determine whether the dust concentration has reached the alarm state of exceeding the limit.

[0033] The preset high-risk threshold is set at a relative humidity of 85%RH. This value is determined based on the hygroscopic isotherm characteristics of common food raw materials such as sucrose and milk powder. Under standard conditions at 25℃, when the relative humidity is higher than 85%RH, the equilibrium moisture absorption rate of sugar and lipid dust can reach over 30%, and the dust particles change from a loose state to a strongly adhesive state, easily combining with condensed water mist to form water-powder multiphase aerosols. This threshold is used to determine whether the current environment is in a high-humidity, high-risk state.

[0034] The preset cleaning threshold is set to 80% of the factory-calibrated transmitted light intensity benchmark value of the integrated optical probe. This value is determined based on the detection accuracy attenuation characteristics of the optical probe. When the transmitted light intensity is lower than 80% of the benchmark value, the dust detection error of the probe will exceed ±5%, which cannot meet the accurate detection requirements of dust concentration in food processing workshops. This threshold is used to determine whether the probe lens has reached a contaminated state that requires cleaning.

[0035] The preset reduction threshold is set to 5% of the decrease in dust concentration corresponding to the scattered light intensity, consistent with the criterion for judging the decrease in scattered light intensity. This value is determined based on the normal dust removal efficiency of the variable frequency dust removal module. When the power of the variable frequency fan increases, the dust concentration decrease under normal dust removal conditions is consistently higher than 5%, thus distinguishing between normal dust removal performance and abnormal resistance increase conditions. This threshold is used to determine whether the dust removal action has achieved the expected effect.

[0036] The preset de-adhesion time threshold is set to 30 seconds. This value is determined based on the thermodynamic characteristics of water evaporation in sugar and lipoid contaminants. Under constant temperature heating at 60°C, soft sugar and lipoid contaminants with a thickness not exceeding 0.5 mm on the lens surface can completely evaporate their moisture within 30 seconds, achieving the transformation of wet, sticky contaminants into a dry, loose state. This threshold is used to determine whether the contaminants have completely dried and de-adheded.

[0037] The preset fluctuation threshold is set to 0.5% of the transmitted light intensity reference value. This value is determined based on the signal stability characteristics of the optical probe. When the fluctuation amplitude of the transmitted light intensity is lower than this value, it can be determined that the moisture of the dirt on the lens surface has completely evaporated, and the physical state of the dirt tends to be stable. This threshold is used to help determine whether the dirt has transformed into a dry and loose state.

[0038] The preset transmission recovery threshold is set to 90% of the factory-calibrated transmission light intensity reference value of the integrated optical probe. This value is determined based on the normal detection accuracy requirements of the optical probe. When the transmission light intensity recovers to more than 90% of the reference value, the probe's detection error can be controlled within ±2%, fully meeting the accurate detection requirements of dust concentration in food processing workshops. This threshold is used to determine whether the probe cleaning action has achieved the expected effect.

[0039] The preset efficiency threshold is set to 20. This value is derived from fitting the rated operating conditions of the variable frequency dust collector module. Under normal dust collection conditions, the ratio of the increase in fan power to the decrease in dust concentration remains stable within 5. When this ratio exceeds 20, it indicates that the increase in fan power has not brought about a corresponding improvement in dust collection efficiency, and the operating resistance of the pipeline and filter bags has abnormally surged. Using this as the judgment boundary for slurry-like micro-clogging allows for accurate identification of early signs of clogging. This threshold is used to determine whether slurry-like micro-clogging has occurred.

[0040] The preset time threshold is set to 60 seconds. This value is determined based on the thermal reversal characteristics of hot dry air on the high-humidity gas inside the pipeline. Under normal pipeline wind speed, after continuously injecting hot dry air for 60 seconds, the temperature and humidity of the mixed gas throughout the pipeline can be stabilized, ensuring that the thermal intervention effect is fully manifested. This threshold is used to determine whether the thermal reversal action has reached its effective time.

[0041] The preset temperature difference threshold is set to 5℃. This value is determined based on engineering experience in calculating atmospheric dew point and is referred to in engineering as the dew point safety margin. When the gas temperature is more than 5℃ higher than the local dew point temperature, condensation on the filter bag surface can be completely avoided, thus blocking the mud-like phase transition of sugar and lipid dust at its source. This threshold is used to determine whether the effect of injecting hot dry air meets the anti-condensation requirements.

[0042] The preset stabilization time threshold is set to 10 seconds. This value is determined based on the stability characteristics of the gas thermodynamic state within the pipeline. When the temperature difference meets the requirements and remains stable for more than 10 seconds, it can be determined that the thermodynamic state within the pipeline has reached a stable state, avoiding misjudgments caused by instantaneous data fluctuations. This threshold is used to assist in determining whether the anti-condensation control has reached a stable state.

[0043] The heating time is set to 15 seconds. This value is determined based on the heating and evaporation characteristics of condensed water mist. Under constant temperature heating at 60°C, the micron-sized condensed water mist on the lens surface and in the detection area can be completely evaporated within 15 seconds, thus completing the thermal verification of false positives. This duration is used to complete the thermal verification of false positives.

[0044] Furthermore, based on the completed hardware communication link, calibrated system operating parameters, and judgment thresholds, the central controller performs time-series sliding window acquisition of the entire system's operating parameters, data standardization preprocessing, and preliminary judgment of the operating status, providing a unified, stable, and spatiotemporally matched input data source for the execution of subsequent control logic of the entire system.

[0045] The central controller uses a calibrated 5-second fixed acquisition cycle. Through an established industrial Ethernet communication link, it synchronously acquires the relative humidity and current gas temperature output by the environmental sensing unit, the scattered light intensity and transmitted light intensity output by the integrated optical probe, and the real-time output active power of the variable frequency fan in the variable frequency dust removal module. This synchronous acquisition design ensures the spatiotemporal consistency of all operating parameters, eliminates judgment biases caused by time differences in the acquisition of different parameters, and provides a unified time reference for the coordinated control of the entire system.

[0046] The central controller performs sliding window filtering on all data acquired in each acquisition cycle. The sliding window covers valid data from three consecutive acquisition cycles. The central controller performs an arithmetic average of the data of the same type within the window and removes single abnormal jump data exceeding ±10% of the average value within the window. After removing abnormal jump data, if there are at least two sets of valid data remaining in the window, the arithmetic average of the remaining valid data is used as the final input data for that acquisition cycle; if there are fewer than two sets of valid data remaining in the window, the final input data from the previous acquisition cycle is used as the valid data for the current cycle. This filtering method is adaptable to acquisition anomalies caused by airflow disturbances in food processing plant pipelines, instantaneous jumps in optical signals, and fluctuations in power grid voltage. It preserves the true trend of operating condition changes while effectively filtering out instantaneous interference, ensuring the stability and accuracy of the input data.

[0047] The central controller converts the filtered scattered light intensity of each acquisition cycle into a corresponding dust concentration value and compares it in real time with the calibrated preset alarm threshold. Simultaneously, it compares the filtered relative humidity of the same cycle with the calibrated preset high-risk threshold. Based on the comparison results of two consecutive acquisition cycles, the central controller makes a preliminary judgment on whether the dust concentration exceeds the standard or the environment is in a high-humidity state. This continuous dual-cycle judgment design further filters out interference from instantaneous data fluctuations, adapts to the characteristics of water mist instantaneous accumulation and dissipation in the high-humidity environment of food processing workshops, and reduces the probability of false judgments in the initial assessment.

[0048] The central controller compares the filtered transmitted light intensity of each acquisition cycle with a calibrated preset cleaning threshold in real time. Based on the comparison results of two consecutive acquisition cycles, the central controller makes a preliminary determination of the contamination status of the integrated optical probe lens.

[0049] During the operation of the variable frequency dust removal module, the central controller continuously stores the real-time active power output of the variable frequency fan after filtering in each acquisition cycle. The central controller synchronously compares the changes in the output active power values ​​of adjacent acquisition cycles to make a preliminary determination of the operating power change status of the variable frequency dust removal module.

[0050] Furthermore, based on the preliminary judgment results of the completed dust concentration exceeding the standard and high humidity environment, the central controller executes the dust concentration false positive stripping and dust removal command control under high humidity conditions.

[0051] When the preliminary judgment results show that the dust concentration corresponding to the scattered light intensity is greater than the calibrated preset alarm threshold in two consecutive collection cycles, and the relative humidity collected simultaneously is greater than the calibrated preset high-risk threshold, the central controller directly intercepts the acceleration command sent to the variable frequency dust removal module. This interception action breaks the inherent operating logic of the existing technology that starts high-speed suction as soon as the monitoring exceeds the standard, avoiding erroneous suction actions that aggravate the high humidity environment in the pipeline, while reducing the ineffective idling of the variable frequency dust removal module, and reducing equipment energy consumption and filter bag wear.

[0052] While maintaining the acceleration command interception state, the central controller sends an activation command to the adaptive constant-temperature heating ring of the integrated optical probe, controlling the integrated optical probe to enter the constant-temperature heating state to perform thermal evaporation treatment on the medium in the detection area. The target temperature for constant-temperature heating is set at 60℃, with a temperature control accuracy matching the calibration ±1℃. This temperature enables rapid evaporation of micron-level condensed water mist in the detection area without causing thermal damage to the probe's optical components or causing charring and deterioration of food dust in the detection area, fully meeting the safety production requirements of food processing plants.

[0053] During the heating process, the central controller continuously collects the scattered light intensity at a fixed 5-second acquisition cycle, comparing the dust concentration corresponding to the scattered light intensity with the calibrated preset alarm threshold in real time. If the dust concentration corresponding to the scattered light intensity falls below the preset alarm threshold before the calibrated heating time is reached, the central controller determines that the excessive signal is a false positive caused by water mist condensation. The central controller maintains the interception state of the acceleration command and simultaneously sends a shutdown command to the adaptive constant temperature heating loop, ending the heating verification process. This nested timing judgment logic can accurately isolate the optical artifacts caused by water-powder multiphase aerosols, solving the core defect of existing technologies where single-dimensional physical quantity threshold monitoring cannot distinguish between condensed water mist and real dust, significantly reducing the probability of system false alarms and fundamentally reducing system erroneous actions caused by false alarms.

[0054] The central controller continuously monitors the heating time. If, after the calibrated heating time has elapsed, the dust concentration corresponding to the scattered light intensity still exceeds the calibrated preset alarm threshold, the central controller determines that the exceeding signal is a genuine dust concentration exceedance. The central controller then releases the interception state of the acceleration command and sends an acceleration command to the variable frequency dust collector module, triggering the module to enter accelerated dust collection operation. During the execution of the acceleration command, the central controller increases the operating frequency of the variable frequency fan in 5Hz increments, not exceeding the calibrated rated upper limit of 50Hz, until the dust concentration falls below the preset alarm threshold. This thermal verification process ensures that the dust collection system's startup is entirely based on a genuine dust concentration exceedance signal, avoiding the disruption of the thermodynamic balance within the pipeline caused by ineffective suction actions, and reducing the risk of dew point puncture and filter bag clogging.

[0055] Furthermore, based on the preliminary judgment results of the contamination status of the integrated optical probe lens, the central controller performs a graded self-cleaning control of phase change blocking and kinetic energy progression.

[0056] When the initial assessment results show that the transmitted light intensity is below the preset cleaning threshold for two consecutive acquisition cycles, the central controller triggers the self-cleaning program of the integrated optical probe. The central controller controls the tiered self-cleaning airflow unit and the integrated optical probe to sequentially perform heating and baking followed by parallel hot air blowing on the lens for cleaning. Based on the recovery status of the transmitted light intensity, it selectively performs high-pressure airflow vertical impact cleaning. This tiered, progressive execution logic breaks away from the existing technology's direct high-pressure cold air blowing cleaning method, fundamentally avoiding the problem of sugar and lipid fouling solidification caused by alternating hot and cold temperatures, and preventing irreversible damage to the lens optical path.

[0057] During the dust removal process involving heating and baking, the central controller sends an activation command to the adaptive constant-temperature heating ring of the integrated optical probe, continuously heating and baking the dirt on the lens surface at a constant temperature. The target heating temperature is set at 60℃, with a temperature control accuracy matching the calibration ±1℃. This temperature allows for the uniform evaporation of moisture within the high-humidity sugar-lipid deposits on the lens surface, without causing the sugar-lipid deposits to caramelize and adhere, or causing irreversible damage to the lens's optical performance. During the heating process, the central controller continuously monitors changes in transmitted light intensity at a fixed 5-second acquisition cycle.

[0058] The central controller continuously compares the trend of transmitted light intensity changes. When the change in transmitted light intensity does not exceed the calibrated preset fluctuation threshold within three consecutive acquisition cycles, the central controller determines that the transmitted light intensity has stopped decaying. When the transmitted light intensity stops decaying, and within the calibrated preset de-adhesion time threshold, the fluctuation amplitude of the transmitted light intensity remains below the calibrated preset fluctuation threshold, the central controller determines that the dirt on the lens surface has transformed into a dry and loose state. This determination method can accurately control the dehydration state of the dirt, ensuring that subsequent cleaning operations are performed in an environment without liquid water, completely blocking the conditions for condensation phase change, and preventing wet, sticky dirt from solidifying upon cooling.

[0059] Once the determination is successful, the central controller maintains the adaptive constant-temperature heating ring in the open state and simultaneously sends a start command to the low-pressure thermal laminar flow generator of the staged self-cleaning air path unit, controlling the staged self-cleaning air path unit to perform a parallel blowing cleaning action with a hot air curtain. During the parallel blowing cleaning action with a hot air curtain, the central controller activates the low-pressure thermal laminar flow generator to output a 60°C hot air curtain, horizontally blowing away the dry, loose dirt from the lens surface. The continuous blowing duration of the hot air curtain is set to 10 seconds. This continuous heating design avoids sudden temperature drops on the lens surface, preventing condensation phase changes caused by alternating hot and cold temperatures, and preventing the dried dust from re-absorbing moisture and adhering. Simultaneously, the parallel blowing method of the hot air curtain avoids secondary contamination caused by direct airflow impact on the lens, ensuring the non-destructive nature of the cleaning process.

[0060] After the parallel blowing of the hot air curtain completes the dust removal process, the central controller acquires the filtered transmitted light intensity for the current acquisition cycle and compares it with the calibrated preset transmission recovery threshold. If the current transmitted light intensity is still lower than the preset transmission recovery threshold, the central controller determines that there is stubborn hard dirt on the lens surface.

[0061] The central controller completes the parallel blowing cleaning action of the hot air curtain, which is the sole prerequisite for triggering the high-pressure pulse backflush air chamber. When the prerequisite is met and stubborn scale is detected, the central controller determines that the stubborn scale has completed moisture evaporation and solidification. Based on this determination, the central controller maintains the adaptive constant-temperature heating ring in the open state and simultaneously sends a start command to the high-pressure pulse backflush air chamber of the staged self-cleaning air path unit. This commands the staged self-cleaning air path unit to perform a vertical impact cleaning action with high-pressure airflow, triggering the high-pressure pulse backflush air chamber to output a high-pressure airflow with a single duration of 0.2s and a rated operating pressure of 0.6MPa, breaking up the stubborn scale on the lens surface. This timing design, limited by the prerequisite, avoids direct impact of high-pressure airflow on wet, sticky scale, preventing scale from being squeezed into the tiny gaps of the lens and forming an irreversible, stubborn hard shell, thus ensuring the long-term transparency of the lens optical path and the stability of detection accuracy.

[0062] After the high-pressure airflow vertical impact cleaning action is completed, the central controller re-acquires the transmitted light intensity for the current cycle. If the transmitted light intensity recovers to above the calibrated preset transmission recovery threshold, the self-cleaning process ends and the adaptive constant temperature heating ring is turned off. If the transmitted light intensity is still below the preset transmission recovery threshold, the graded self-cleaning process is repeated, with a maximum of 3 repetitions. After 3 repetitions, a probe maintenance warning message is output to the workshop operation and maintenance platform.

[0063] Furthermore, based on the acceleration commands issued to the variable frequency dust removal module and the continuously collected system operation data, the central controller performs interlocked control of energy efficiency feedback and dew point intervention.

[0064] After issuing an acceleration command to the variable frequency dust removal module, the central controller continuously collects the real-time output active power of the variable frequency fan within the module at a fixed 5-second acquisition cycle. Simultaneously, it acquires the scattered light intensity from the integrated optical probe, and the relative humidity and current gas temperature from the environmental sensing unit. This synchronous acquisition design ensures the spatiotemporal consistency of all operating parameters, eliminates judgment biases caused by time differences in parameter acquisition, and provides accurate input data for interlocking control.

[0065] The central controller continuously compares changes in the output power of the variable frequency dust removal module with changes in the intensity of scattered light. When the output power of the variable frequency dust removal module increases and generates a power increment, the decrease in dust concentration corresponding to the scattered light intensity is lower than the calibrated preset decrease threshold, and the synchronously collected relative humidity is higher than the calibrated preset high-risk threshold, the central controller sends a frequency lock command to the variable frequency dust removal module to lock its current operating frequency. Simultaneously, it sends a start command to the dew point backup bypass air supply module, controlling it to inject hot dry air into the main pipeline. This frequency lock action breaks the inherent operating logic of blindly increasing the operating frequency of the variable frequency dust removal module when pipeline resistance increases, avoiding the disruption of the thermodynamic balance within the pipeline due to a sudden increase in negative pressure. This fundamentally reduces the risk of condensation on the filter bag surface and the mud-like phase transition of sugar and lipid dust. The temperature of the injected hot dry air is controlled between 45℃ and 55℃, and the dew point temperature is no higher than -10℃, fully meeting the safety production requirements of food processing plants and will not negatively impact the quality of food materials.

[0066] During the execution of acceleration commands, the central controller continuously compares the power increment and the decrease in scattered light intensity of the variable frequency dust removal module to calculate the resistance efficiency factor. The resistance efficiency factor is the ratio of the power increment to the decrease in scattered light intensity, where the power increment is the difference between the current output power of the variable frequency dust removal module and the initial output power before acceleration, and the decrease in scattered light intensity is the difference between the initial scattered light intensity before acceleration and the current scattered light intensity. When the decrease in scattered light intensity is less than or equal to 0, the central controller directly determines that the resistance efficiency factor exceeds the calibrated preset efficiency threshold. The central controller compares the calculated resistance efficiency factor with the calibrated preset efficiency threshold. When the resistance efficiency factor is greater than the preset efficiency threshold and the relative humidity is greater than the preset high-risk threshold, the central controller determines that slurry-like micro-clogging has occurred in the filter bag and main pipeline. This cross-domain correlation between the fan's electrical output parameters and dust optical detection parameters can accurately identify early signs of filter bag micro-clogging, solving the core defect of existing technologies that rely solely on differential pressure sensors and cannot identify early slurry-like micro-clogging, thus enabling proactive intervention against bag clogging risks.

[0067] Based on the confirmed micro-clogging caused by slurry formation, the central controller prohibits increasing the operating frequency of the locked variable frequency dust collector module. It controls the dew point prevention bypass air supply module to inject hot dry air proportionally via a proportional control valve. Simultaneously, it outputs a high-humidity bag clogging warning to the workshop's central control system, triggering a reduction in production capacity on the workshop line. The control logic that prohibits frequency increases prevents the compaction and solidification of soft deposits on the filter bag surface caused by increased negative pressure in the pipeline. The continuous injection of hot dry air directly adjusts the thermodynamic state of the gas within the pipeline. This production line capacity reduction reduces the generation of dust and high-temperature steam at the source, thus blocking the bag clogging process through multiple dimensions. The initial opening of the proportional control valve is set to 20%, and subsequent openings are dynamically adjusted based on real-time dynamic temperature differences, with each adjustment not exceeding 10%. For every 1°C decrease in the difference between the dynamic temperature difference and the preset temperature difference threshold, the opening of the proportional control valve increases by 5%, ensuring the stability of the control process.

[0068] The central controller calculates the local dew point temperature based on the relative humidity and current gas temperature collected by the environmental sensing unit using the Magnus formula. The calculation process conforms to the specifications for atmospheric thermodynamics engineering applications and is suitable for the normal pressure and 0℃ to 60℃ operating environment of food workshops. The specific calculation formula is as follows: in, This refers to the local dew point temperature, expressed in °C. The current gas temperature collected by the environmental sensing unit, in °C; The relative humidity collected by the environmental sensing unit is expressed as a percentage (%). The simplified calculation formula has a calculation error of no more than ±0.5℃ under normal operating conditions in a food workshop, and the calculation results can be directly used for real-time engineering control. During the proportional injection of hot dry air, the central controller continuously compares the current gas temperature with the local dew point temperature to calculate the dynamic temperature difference, which is the difference between the current gas temperature and the local dew point temperature. The central controller compares the dynamic temperature difference with a calibrated preset temperature difference threshold. When the dynamic temperature difference is lower than the preset threshold, the central controller sends an opening increase command to the proportional control valve, increasing the injection volume of hot dry air until the dynamic temperature difference reaches or exceeds the preset threshold. This closed-loop control method ensures that the gas temperature inside the pipeline remains stable within a safe range above the dew point temperature, completely blocking condensation conditions on the filter bag surface and solving the shortcomings of existing open-loop static humidity control technology, which cannot adapt to the dynamic thermodynamic changes during the suction process.

[0069] When the dynamic temperature difference reaches or exceeds the preset temperature difference threshold, and this state continues for a preset stabilization time threshold, the central controller recalculates the current resistance efficiency factor. The central controller compares the recalculated resistance efficiency factor with the preset efficiency threshold. If the current resistance efficiency factor falls below the preset efficiency threshold, the central controller determines that the slurry-like micro-blockage has been successfully reversed. Based on this determination, the central controller issues a command to gradually reduce the opening of the proportional control valve until the proportional control valve is completely closed, stopping the injection of hot dry air. At the same time, it releases the lock on the operating frequency of the variable frequency dust removal module and outputs a self-recovery signal to the workshop central control system, triggering the workshop production line to resume normal production capacity.

[0070] The central controller continuously monitors the injection time of hot dry air. After the injected hot dry air reaches the calibrated preset time threshold, the central controller recalculates the current resistance efficiency factor. If the current resistance efficiency factor is still greater than the preset efficiency threshold, the central controller determines that the thermal reversal of the slurry-like micro-blockage has failed. Based on this determination, the central controller issues a forced shutdown command to the variable frequency dust removal module, seals the fireproof and explosion-proof valves at the system's inlet and outlet, and simultaneously outputs a manual cleaning alarm to the workshop central control system and the operation and maintenance platform. This completes the safety backup handling for extreme abnormal operating conditions, avoiding permanent damage to the filter bags and dust explosion hazards caused by continuous system operation.

[0071] The implementation principle of the dust concentration monitoring and dust removal system in the food processing workshop of this application is as follows: This application addresses the extreme working conditions of food processing workshops, characterized by "high humidity, high sugar, and high fat," where large amounts of high-temperature steam are released and dust is rich in sugar and oil. Through thermal decoupling and energy efficiency interlocking control, it effectively solves the problems of probe false alarms and irreversible bag clogging caused by condensation phase change. Firstly, to solve the false positive error caused by water-powder multiphase aerosol artifacts at the monitoring end, when the scattered light intensity and relative humidity exceed preset thresholds, the central controller intercepts the acceleration command of the frequency conversion dust removal module and controls the integrated optical probe to perform heating verification. This logic can accurately remove monitoring artifacts caused by tiny condensed water mist, avoiding frequent triggering of erroneous mechanical responses in the dust removal system due to misjudgment. Secondly, to address the defects of refrigerant phase change solidification and permanent blindness of the optical path caused by direct blowing of high-pressure cold air at the cleaning end, when the transmitted light intensity of the probe is lower than the preset cleaning threshold, the system will control the graded self-cleaning air path unit to sequentially perform the cleaning actions of heating and baking and parallel blowing of hot air curtain, so that the wet and sticky soft dirt is transformed into a dry and loose state and is blown away laterally. Then, only when stubborn hard dirt is detected will the high-pressure airflow be selectively triggered to vertically impact and break it up. This graded self-cleaning mechanism blocks the condensation phase change conditions of sugar and lipid dirt when it is cooled and solidified, ensuring the integrity and long-term transparency of the lens optical path. Finally, to overcome the defect of the actuator losing dynamic state feedback and blindly increasing the suction negative pressure, which causes the local airflow to drop below the dew point and thus leads to irreversible bag clogging, the system will combine the power increment of the variable frequency dust removal module and the decrease in scattered light intensity to calculate the resistance efficiency factor during acceleration. Once it is determined that the filter bag and main pipeline have slurry micro-clogging, the central controller will immediately lock the operating frequency and control the dew point prevention bypass air supply module to dynamically inject hot dry air in proportion. This closed-loop sensing intervention based on the dynamic feedback and thermodynamic state of the dust removal end can ensure that the dynamic temperature difference reaches the safe threshold, thereby successfully reversing the micro-clogging and blocking the slurry phase transition of high-viscosity glycolipid dust from the root, avoiding permanent physical blinding of the filter pores and explosion-proof safety hazards.

[0072] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dust concentration monitoring and dust removal system for food processing workshops, characterized in that, It includes a central controller, an environmental sensing unit, an integrated optical probe, a variable frequency dust removal module, a graded self-cleaning air path unit, and a dew point protection bypass air supply module. The central controller acquires the relative humidity of the environmental sensing unit and collects the scattered light intensity and transmitted light intensity of the integrated optical probe. When the intensity of the scattered light exceeds a preset alarm threshold and the relative humidity exceeds a preset high-risk threshold, the central controller intercepts the acceleration command of the variable frequency dust removal module and controls the integrated optical probe to heat up; if the intensity of the scattered light still exceeds the preset alarm threshold after a set heating time, the acceleration command is triggered. When the transmitted light intensity is lower than the preset cleaning threshold, the central controller controls the graded self-cleaning air path unit to perform heating and baking and hot air curtain parallel blowing cleaning actions on the integrated optical probe in sequence, and selectively performs high-pressure airflow vertical impact cleaning action based on the recovery state of the transmitted light intensity. When the acceleration command is executed, if the output power of the variable frequency dust removal module increases and generates a power increment, the decrease in the intensity of the scattered light is lower than the preset decrease threshold, and the relative humidity is greater than the preset high-risk threshold, the central controller locks its operating frequency and controls the dew point protection bypass air supply module to inject hot dry air.

2. The system according to claim 1, characterized in that, The integrated optical probe is equipped with an adaptive constant temperature heating ring. The central controller controls the heating of the integrated optical probe by activating the adaptive constant temperature heating loop; If the intensity of the scattered light falls below the preset alarm threshold before the heating set time is reached, the central controller determines that it is a false positive caused by water mist condensation, maintains the interception state of the acceleration command, and shuts down the adaptive constant temperature heating ring.

3. The system according to claim 2, characterized in that, When performing the dust removal action of heating and baking, the central controller activates the adaptive constant temperature heating ring and continuously monitors the transmitted light intensity; When the transmitted light intensity stops decaying, and within a preset de-adhesion time threshold, the fluctuation range of the transmitted light intensity is lower than a preset fluctuation threshold, the central controller determines that the dirt has been converted into a dry and loose state. Once the determination is successful, the central controller maintains the adaptive constant temperature heating ring open and controls the graded self-cleaning air path unit to perform the dust removal action of parallel blowing of the hot air curtain.

4. The system according to claim 3, characterized in that, After the parallel blowing of the hot air curtain is completed, the central controller acquires the current transmitted light intensity. If the current transmitted light intensity is still lower than the preset transmission recovery threshold, the central controller determines that there is stubborn hard dirt.

5. The system according to claim 4, characterized in that, The graded self-cleaning air path unit includes a low-pressure thermal laminar flow generator and a high-pressure pulse backflush air manifold. When performing the parallel blowing cleaning action of the hot air curtain, the central controller starts the low-pressure hot laminar flow generator to output the hot air curtain, which laterally blows away the dirt in a dry and loose state to block the condensation phase change.

6. The system according to claim 5, characterized in that, The central controller completes the parallel blowing cleaning action of the hot air curtain as a prerequisite for triggering the high-pressure pulse back-blowing air bag. When the aforementioned preconditions are met and the presence of the stubborn scale is determined, the central controller determines that the stubborn scale has completed moisture evaporation and solidification. Based on this determination, the central controller controls the graded self-cleaning air circuit unit to perform the high-pressure airflow vertical impact cleaning action, so as to trigger the high-pressure pulse backflush air bag to output a single airflow to break up the stubborn hard scale.

7. The system according to claim 1, characterized in that, When executing the acceleration command, the central controller compares the power increment of the variable frequency dust removal module with the decrease in the intensity of the scattered light to calculate the resistance efficiency factor; When the resistance efficiency factor is greater than the preset efficiency threshold and the relative humidity is greater than the high-risk threshold, the central controller determines that mud-like micro-blockage has occurred. Based on this determination, the central controller prohibits increasing the locked operating frequency, controls the dew point prevention bypass air supply module to inject the hot dry air proportionally through a preset proportional regulating valve, and simultaneously outputs a high humidity bag clogging warning message to trigger the workshop production line to reduce production capacity.

8. The system according to claim 7, characterized in that, After the hot dry air has been injected for a preset time threshold, the central controller recalculates the current drag efficiency factor. If the current resistance efficiency factor is still greater than the preset efficiency threshold, the central controller determines that the thermal reversal of the mud micro-blockage has failed. Based on this determination, the central controller forcibly shuts down the variable frequency dust removal module, closes the fireproof and explosion-proof valves of the system, and simultaneously outputs a manual cleaning alarm.

9. The system according to claim 7, characterized in that, The environmental sensing unit is configured inside the main pipe of the variable frequency dust removal module and collects the current gas temperature; The central controller calculates the local dew point temperature based on the relative humidity and the current gas temperature; During the process of injecting the hot dry air in proportion, the central controller compares the current gas temperature with the local dew point temperature to obtain the dynamic temperature difference; When the dynamic temperature difference is lower than the preset temperature difference threshold, the central controller increases the opening of the proportional control valve until the dynamic temperature difference reaches or exceeds the preset temperature difference threshold.

10. The system according to claim 9, characterized in that, When the dynamic temperature difference reaches or exceeds the preset temperature difference threshold, and this state continues for a preset stable time threshold, the central controller recalculates the current resistance efficiency factor. If the current resistance efficiency factor falls below the preset efficiency threshold, the central controller determines that the mud-like micro-blockage has been successfully reversed; Based on the determination, the central controller controls the proportional regulating valve to gradually reduce its opening until it closes to stop injecting the hot dry air, simultaneously unlocks the operating frequency, and outputs a self-recovery signal to trigger the workshop production line to resume normal production capacity.

Images