阅读说明：本技术 一种智能识别型冷凝除湿干化系统 (Intelligent recognition type condensation dehumidification mummification system ) 是由 梁静 朱振东 杨辉 于 2020-04-26 设计创作，主要内容包括：本发明公开了一种智能识别型冷凝除湿干化系统,涉及污泥干化的技术领域,包括制冷单元、运输单元、信息处理模块、图像处理模块。信息处理模块、图像处理模块均通过BP神经网络与PLC控制器连接,PLC控制器用于控制一级制冷循环系统及二级制冷循环系统。本系统采用两个或多个制冷循环系统的制冷除湿技术,使降温蒸发器的蒸发压力梯度分别提高,有效提高机组除湿量。通过设置温湿度传感器和水分检测仪,控制系统的开启关闭及系统内压缩机的运行频率及功耗,有效提高除湿量和降低运行功耗。通过设置图像处理模块智能识别湿污泥和干污泥形态、变化过程,反向实时控制制冷除湿系统的运行,达到节能环保、智能干化效果。(The invention discloses an intelligent identification type condensation, dehumidification and drying system, and relates to the technical field of sludge drying. The information processing module and the image processing module are connected with the PLC through a BP neural network, and the PLC is used for controlling the primary refrigeration circulating system and the secondary refrigeration circulating system. The system adopts the refrigeration and dehumidification technology of two or more refrigeration cycle systems, so that the evaporation pressure gradient of the cooling evaporator is respectively improved, and the unit dehumidification capacity is effectively improved. Through setting up temperature and humidity sensor and moisture detector, control system's opening and closing and the operating frequency and the consumption of compressor in the system effectively improve the dehumidification portion and reduce the operation consumption. The image processing module is arranged to intelligently identify the forms and the change processes of wet sludge and dry sludge, and the operation of the refrigeration and dehumidification system is reversely controlled in real time, so that the effects of energy conservation, environmental protection and intelligent drying are achieved.)

1. An intelligent identification type condensation, dehumidification and drying system is characterized by comprising a refrigeration unit (1), a transportation unit (2), an information processing module and an image processing module, wherein a low-temperature and wet air storage cavity (7) is arranged between the refrigeration unit (1) and the transportation unit (2);

the conveying unit (2) comprises a feeding mechanism (3), an upper layer mesh belt (4), a lower layer mesh belt (5) and a discharging mechanism (6), wherein the feeding mechanism (3) is connected to the conveying head end of the upper layer mesh belt (4), and the discharging mechanism (6) is connected to the conveying tail end of the lower layer mesh belt (5);

the refrigeration unit (1) comprises a first chamber (8) and a second chamber (9), wherein an inlet of the first chamber (8) is communicated with the low-temperature humid air storage cavity (7), an outlet of the first chamber (8) faces the upper layer mesh belt (4), a primary refrigeration cycle system is arranged in the first chamber (8), an inlet of the second chamber (9) is communicated with the low-temperature humid air storage cavity (7), an outlet of the second chamber (9) faces the lower layer mesh belt (5), and a secondary refrigeration cycle system is arranged in the second chamber (9);

the information processing module and the image processing module are both connected with a PLC (programmable logic controller) through a BP (back propagation) neural network, and the PLC is used for controlling the primary refrigeration circulating system and the secondary refrigeration circulating system;

the information processing module comprises a temperature and humidity sensor (25) and a moisture detector (26), the temperature and humidity sensor (25) is respectively arranged in the low-temperature humid air storage cavity (7) and the second cavity (9) and is used for detecting the temperature and the humidity of the low-temperature humid air storage cavity (7) and the second cavity (9) in real time, and the moisture detector (26) is arranged at the discharging mechanism (6) and is used for detecting the moisture content of the material in real time;

the image processing module comprises a camera (27), and the camera (27) is used for acquiring the graphic image data of the materials transported by the upper layer mesh belt (4) and the lower layer mesh belt (5) in real time.

2. The intelligent identification type condensation, dehumidification and drying system according to claim 1, wherein the information processing module further comprises a pressure sensor (28) and a dust detector (29), the pressure sensor (28) is respectively disposed in the low temperature and humid air storage chamber (7) and the second chamber (9) for real-time detection and calculation of the pressure difference between the low temperature and humid air storage chamber (7) and the second chamber (9), and the dust detector (29) is disposed in the low temperature and humid air storage chamber (7) for detection of the dust concentration of the low temperature and humid air storage chamber (7).

3. The intelligent identification type condensation, dehumidification and drying system according to claim 2, wherein the primary refrigeration cycle system comprises a primary blower (10), a primary compressor (11), a primary condenser (12), a primary energy-saving heat exchanger (13), a primary filter (14), a primary expansion valve (15), and a primary cooling evaporator (16), the primary compressor (11) is connected to the primary condenser (12), the primary condenser (12) is connected to the primary energy-saving heat exchanger (13), the primary energy-saving heat exchanger (13) is connected to the primary filter (14), the primary filter (14) is connected to the primary expansion valve (15), the primary expansion valve (15) is connected to the primary cooling evaporator (16), and the primary cooling evaporator (16) is connected to the primary energy-saving heat exchanger (13), one-level economize on energy heat exchanger (13) with primary compressor (11) are connected, the air intake of one-level fan (10) with low temperature humid air storage chamber (7) intercommunication, the air outlet orientation of one-level fan (10) upper mesh belt (4), one-level condenser (12) are located one-level fan (10) with between upper mesh belt (4).

4. The intelligent identification type condensation, dehumidification and drying system according to claim 3, wherein the secondary refrigeration cycle system comprises a total heat exchanger (17), a secondary fan (18), a secondary compressor (19), a secondary condenser (20), a secondary energy-saving heat exchanger (21), a secondary filter (22), a secondary expansion valve (23) and a secondary cooling evaporator (24), the secondary compressor (19) is connected with the secondary condenser (20), the secondary condenser (20) is connected with the secondary energy-saving heat exchanger (21), the secondary energy-saving heat exchanger (21) is connected with the secondary filter (22), the secondary filter (22) is connected with the secondary expansion valve (23), the secondary expansion valve (23) is connected with the secondary cooling evaporator (24), and the secondary cooling evaporator (24) is connected with the secondary energy-saving heat exchanger (21), the secondary energy-saving heat exchanger (21) is connected with the secondary compressor (19);

full heat exchanger (17) with second grade cooling evaporimeter (24) first-order cooling evaporimeter (16) are connected, the air intake of full heat exchanger (17) with low temperature humid air stores chamber (7) intercommunication, the air outlet of full heat exchanger (17) with the air intake connection of secondary fan (18), the air outlet orientation of secondary fan (18) lower floor guipure (5), secondary condenser (20) are located secondary fan (18) with between the full heat exchanger (17).

5. The intelligent identification type condensation, dehumidification and drying system according to claim 4, wherein the secondary refrigeration cycle system further comprises a dehumidification solenoid valve (37), an overtemperature protection solenoid valve (38) and a heat rejection condenser (39), one end of the heat rejection condenser (39) is connected with the secondary compressor (19) and the other end of the heat rejection condenser (39) is connected with the secondary condenser (20), the dehumidification solenoid valve (37) is arranged between the secondary compressor (19) and the secondary condenser (20), and the overtemperature protection solenoid valve (38) is arranged between the secondary compressor (19) and the heat rejection condenser (39).

6. The intelligent identification type condensation, dehumidification and drying system according to claim 4, wherein the pressure sensor (28) and the temperature and humidity sensor (25) are disposed between the secondary condenser (20) and the secondary fan (18).

7. The intelligent identification type condensation, dehumidification and drying system according to claim 2, wherein the pressure sensor (28) and the temperature and humidity sensor (25) are disposed on a side of the low temperature and humidity air storage chamber (7) close to the second chamber (9).

8. The intelligent identification type condensation, dehumidification and drying system according to claim 2, wherein a bag-type dust remover (30) is arranged between the first chamber (8) and the low-temperature and humid air storage chamber (7), a dust automatic purging device (31) is arranged on the bag-type dust remover (30), and the dust automatic purging device (31) is in driving connection with the dust detector (29).

9. The intelligent identification type condensation, dehumidification and drying system according to claim 1, wherein the upper layer mesh belt (4) and the lower layer mesh belt (5) are provided with self-cleaning wheels (32) on the sides facing away from the material.

Technical Field

The invention relates to the technical field of sludge drying, in particular to an intelligent identification type condensation, dehumidification and drying system.

Background

The heat pump dehumidification technology is a reverse Carnot cycle process, and utilizes a refrigeration evaporator to cool and dehumidify air.

The existing heat pump dehumidification drying technology has the following problems:

(1) the drying process needs manual intervention: the moisture content and the property change fluctuation of the fed material have great influence on the drying effect, the conventional technology needs manual timely adjustment to achieve the moisture content meeting the requirement, intelligent and automatic operation cannot be realized, and the capacity of resisting the change load of the fed material is poor;

(2) the drying process is not energy-saving enough: the conventional technology cannot identify the requirement of the dried water content in the system, and the refrigeration cycle cannot be intelligently closed after being started, so that energy is wasted;

(3) insufficient dehumidification capacity: in the conventional technology, a single system module, namely a single heating and refrigerating system with only a compressor, an evaporator, a condenser and a heat regenerator, is usually adopted in a refrigeration cycle system, so that the heat exchange degree of a heat pump dehumidification system and hot and humid air is insufficient, and the dehumidification capacity of a unit is insufficient.

Disclosure of Invention

Aiming at the problem in practical application, the invention aims to provide an intelligent identification type condensation, dehumidification and drying system, which comprises the following specific scheme:

an intelligent identification type condensation, dehumidification and drying system comprises a refrigeration unit, a transportation unit, an information processing module and an image processing module, wherein a low-temperature wet air storage cavity is arranged between the refrigeration unit and the transportation unit;

the conveying unit comprises a feeding mechanism, an upper layer mesh belt, a lower layer mesh belt and a discharging mechanism, wherein the feeding mechanism is connected to the conveying head end of the upper layer mesh belt, and the discharging mechanism is connected to the conveying tail end of the lower layer mesh belt;

the refrigerating unit comprises a first cavity and a second cavity, wherein an inlet of the first cavity is communicated with the low-temperature humid air storage cavity, an outlet of the first cavity faces the upper mesh belt, a primary refrigerating circulation system is arranged in the first cavity, an inlet of the second cavity is communicated with the low-temperature humid air storage cavity, an outlet of the second cavity faces the lower mesh belt, and a secondary refrigerating circulation system is arranged in the second cavity;

the information processing module and the image processing module are both connected with a PLC (programmable logic controller) through a BP (back propagation) neural network, and the PLC is used for controlling the primary refrigeration circulating system and the secondary refrigeration circulating system;

the information processing module comprises a temperature and humidity sensor and a moisture detector, the temperature and humidity sensor is respectively arranged in the low-temperature humid air storage cavity and the second cavity and is used for detecting the temperature and the humidity of the low-temperature humid air storage cavity and the second cavity in real time, and the moisture detector is arranged at the discharging mechanism and is used for detecting the moisture content of the material in real time;

the image processing module comprises a camera, and the camera is used for acquiring the graphic image data of the materials transported by the upper-layer mesh belt and the lower-layer mesh belt in real time.

Further preferably, the information processing module further comprises a pressure sensor and a dust detector, the pressure sensor is respectively arranged in the low-temperature humid air storage cavity and the second cavity and used for detecting and calculating the pressure difference between the low-temperature humid air storage cavity and the second cavity in real time, and the dust detector is arranged in the low-temperature humid air storage cavity and used for detecting the dust concentration in the low-temperature humid air storage cavity.

Further preferably, the primary refrigeration cycle system comprises a primary fan, a primary compressor, a primary condenser, a primary energy-saving heat exchanger, a primary filter, a primary expansion valve and a primary cooling evaporator, the first-stage compressor is connected with the first-stage condenser, the first-stage condenser is connected with the first-stage energy-saving heat exchanger, the first-stage energy-saving heat exchanger is connected with the first-stage filter, the first-stage filter is connected with the first-stage expansion valve, the first-stage expansion valve is connected with the first-stage cooling evaporator, the first-stage cooling evaporator is connected with the first-stage energy-saving heat exchanger, the first-stage energy-saving heat exchanger is connected with the first-stage compressor, an air inlet of the first-stage fan is communicated with the low-temperature wet air storage cavity, the air outlet of the primary fan faces the upper mesh belt, and the primary condenser is arranged between the primary fan and the upper mesh belt.

Further preferably, the secondary refrigeration cycle system includes a total heat exchanger, a secondary fan, a secondary compressor, a secondary condenser, a secondary energy-saving heat exchanger, a secondary filter, a secondary expansion valve, and a secondary cooling evaporator, the secondary compressor is connected to the secondary condenser, the secondary condenser is connected to the secondary energy-saving heat exchanger, the secondary energy-saving heat exchanger is connected to the secondary filter, the secondary filter is connected to the secondary expansion valve, the secondary expansion valve is connected to the secondary cooling evaporator, the secondary cooling evaporator is connected to the secondary energy-saving heat exchanger, and the secondary energy-saving heat exchanger is connected to the secondary compressor;

the full heat exchanger with the second grade cooling evaporimeter the one-level cooling evaporimeter is connected, the air intake of full heat exchanger with low temperature humid air storage chamber intercommunication, the air outlet of full heat exchanger with the air intake connection of second grade fan, the air outlet orientation of second grade fan lower floor's guipure, the second grade condenser is located the second grade fan with between the full heat exchanger.

Further preferably, second grade refrigeration cycle system still includes dehumidification solenoid valve, overtemperature protection solenoid valve, heat extraction condenser one end with the second grade compressor, the other end with the second grade condenser is connected, the dehumidification solenoid valve sets up the second grade compressor with between the second grade condenser, overtemperature protection solenoid valve sets up the second grade compressor with between the heat extraction condenser.

Further preferably, the pressure sensor and the temperature and humidity sensor are arranged between the secondary condenser and the secondary fan.

Further preferably, the pressure sensor and the temperature and humidity sensor are disposed on a side of the low-temperature humid air storage chamber close to the second chamber.

Further preferably, a bag-type dust remover is arranged between the first cavity and the low-temperature wet air storage cavity, an automatic dust blowing device is arranged on the bag-type dust remover, and the automatic dust blowing device is in driving connection with the dust detector.

Further preferably, the upper-layer mesh belt and the lower-layer mesh belt are provided with self-cleaning rotating wheels on the sides departing from the material.

Compared with the prior art, the invention has the following beneficial effects:

(1) the system connects the first-stage refrigeration cycle system and the refrigeration and dehumidification unit of the second-stage refrigeration cycle system in parallel, the cooling evaporator of each refrigeration cycle system is arranged in series in the upward direction of air flow, and the condenser is also arranged in series in the upward direction of air flow. The refrigeration and dehumidification technology adopting two refrigeration cycle systems can respectively improve the evaporation pressure gradient of the cooling evaporator, reduce the condensation pressure gradient of the condenser, achieve the effect of gradient cooling of hot and humid air, and effectively improve the unit dehumidification capacity.

(2) According to the system, the temperature and humidity of air in the system are monitored in real time by arranging the temperature and humidity sensor and the moisture detector, and the opening and closing of the first-stage refrigeration circulating system and the second-stage refrigeration circulating system and the operation frequency and power consumption of the compressor in each system are automatically adjusted and controlled by combining the preset temperature and humidity threshold value, so that the dehumidification capacity is effectively improved, and the operation power consumption is reduced.

(3) This system is through setting up pressure sensor and dust detector, and the differential pressure of real-time detection static pressure intensity (second cavity) and hybrid chamber (low temperature humid air storage chamber) combines the dust detector real-time detection dust concentration of hybrid chamber, and the automatic ware that sweeps of automatic control dust is opened and is closed, reduces the dust and blocks up sack cleaner filter screen probability, reduces sack cleaner ventilation resistance.

(4) This system is through setting up moisture detector and camera, gathers material moisture content data and graphic image data in real time, and monitoring material property and moisture content change transmit information to the PLC controller through BP neural network, and automatic adjustment refrigeration cycle system optimizes stoving dwell time and temperature and humidity change, and control ejection of compact moisture content satisfies in the dry demand of material, reduces the energy consumption waste and energy consumption loss, the anti feeding of promotion system and changes the load capacity.

Drawings

FIG. 1 is a system equipment diagram;

FIG. 2 is a schematic view of a refrigeration unit;

fig. 3 is a system control flow chart.

Reference numerals: 1. a refrigeration unit; 2. a transport unit; 3. a feeding mechanism; 4. an upper mesh belt; 5. a lower layer mesh belt; 6. a discharging mechanism; 7. a low temperature humid air storage chamber; 8. a first chamber; 9. a second chamber; 10. a primary fan; 11. a first stage compressor; 12. a first-stage condenser; 13. a first-stage energy-saving heat exchanger; 14. a first stage filter; 15. a first-stage expansion valve; 16. a first-stage cooling evaporator; 17. a total heat exchanger; 18. a secondary fan; 19. a secondary compressor; 20. a secondary condenser; 21. a secondary energy-saving heat exchanger; 22. a secondary filter; 23. a secondary expansion valve; 24. a secondary cooling evaporator; 25. a temperature and humidity sensor; 26. a moisture detector; 27. a camera; 28. a pressure sensor; 29. a dust detector; 30. a bag-type dust collector; 31. an automatic dust blower; 32. a self-cleaning runner; 33. a condensing fan; 34. a heat pipe heat exchanger; 35. cleaning the water pump; 36. a spray head; 37. a dehumidification solenoid valve; 38. an overtemperature protection electromagnetic valve; 39. a heat rejection condenser.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.

As shown in fig. 1, an intelligent identification type condensation, dehumidification and drying system comprises a refrigeration unit 1 and a transportation unit 2, wherein a low-temperature wet air storage chamber 7 is arranged between the refrigeration unit 1 and the transportation unit 2. Transport unit 2 includes feed mechanism 3, upper mesh belt 4, lower floor's mesh belt 5, discharge mechanism 6, feed mechanism 3 is including keeping in the fill, the tripper, broken machine that encircles, the crowded strip machine, it is used for carrying mud to upper mesh belt 4 by the stoving box outward to keep in the fill, the tripper is located with broken machine that encircles and is kept in the fill, crowded strip machine is located and is kept in between fill and upper mesh belt 4, utilize feed mechanism 3 to adopt crowded strip granulation mode evenly to lay mud on upper mesh belt 4, with the at utmost makes mud and air contact. Meanwhile, the discharging mechanism 6 is connected to the conveying end of the lower mesh belt 5, and the sludge is discharged by the discharging mechanism 6. Preferably, the self-cleaning rotating wheels 32 are arranged on the sides of the upper mesh belt 4 and the lower mesh belt 5, which are far away from the sludge.

The refrigerating unit 1 comprises a first cavity 8 and a second cavity 9, an inlet of the first cavity 8 is communicated with a low-temperature humid air storage cavity 7, an outlet of the first cavity 8 faces to an upper-layer mesh belt 4, a one-level refrigerating circulation system is arranged in the first cavity 8, an inlet of the second cavity 9 is communicated with the low-temperature humid air storage cavity 7, an outlet of the second cavity 9 faces to a lower-layer mesh belt 5, and a second-level refrigerating circulation system is arranged in the second cavity 9.

Referring to fig. 2, the primary refrigeration cycle system includes a primary fan 10, a primary compressor 11, a primary condenser 12, and a primary economizer heat exchanger 13, the one-level filter 14, the one-level expansion valve 15, the one-level cooling evaporimeter 16, the one-level compressor 11 is connected with the one-level condenser 12, the one-level condenser 12 is connected with one-level energy-saving heat exchanger 13, one-level energy-saving heat exchanger 13 is connected with the one-level filter 14, the one-level filter 14 is connected with the one-level expansion valve 15, the one-level expansion valve 15 is connected with the one-level cooling evaporimeter 16, the one-level cooling evaporimeter 16 is connected with one-level energy-saving heat exchanger 13, the one-level energy-saving heat exchanger 13 is connected with the one-level compressor 11, the air intake of the one-level fan 10 is communicated with the low-temperature humid air storage cavity 7, the air.

The secondary refrigeration cycle system comprises a total heat exchanger 17, a secondary fan 18, a secondary compressor 19, a secondary condenser 20, a secondary energy-saving heat exchanger 21, a secondary filter 22, a secondary expansion valve 23 and a secondary cooling evaporator 24, wherein the secondary compressor 19 is connected with the secondary condenser 20, the secondary condenser 20 is connected with the secondary energy-saving heat exchanger 21, the secondary energy-saving heat exchanger 21 is connected with the secondary filter 22, the secondary filter 22 is connected with the secondary expansion valve 23, the secondary expansion valve 23 is connected with the secondary cooling evaporator 24, the secondary cooling evaporator 24 is connected with the secondary energy-saving heat exchanger 21, and the secondary energy-saving heat exchanger 21 is connected with the secondary compressor 19. The total heat exchanger 17 is connected with the secondary cooling evaporator 24 and the primary cooling evaporator 16, an air inlet of the total heat exchanger 17 is communicated with the low-temperature humid air storage cavity 7, an air outlet of the total heat exchanger 17 is connected with an air inlet of the secondary fan 18, an air outlet of the secondary fan 18 faces the lower mesh belt 5, and the secondary condenser 20 is arranged between the secondary fan 18 and the total heat exchanger 17.

The primary cooling evaporator 16 and the secondary cooling evaporator 24 are connected in parallel to form a whole evaporator unit, and the evaporator unit is provided with a water outlet for draining condensed water. Preferably, a heat pipe heat exchanger 34 is connected to the drain, a condensate outlet is connected to the heat pipe heat exchange hot side, and a condensate inlet is connected to the heat pipe heat exchange cold side. Because the temperature of the discharged condensed water is generally low by 25 ℃, the heat pipe heat exchanger 34 is used for pre-cooling the heat recoverer, the sensible heat of the hot and humid air can be effectively reduced, so as to further cool and refrigerate the hot and humid air, and the recycled waste water discharged by the system is used, so that the ecological environmental protection concept of energy conservation, emission reduction and waste water recycling is achieved.

Furthermore, the evaporator unit has both condensed water discharge and hot and humid air inflow, so that the surface heat exchange effect is important. The cleanliness of the surface can influence the mass transfer and heat exchange effect, and the damp and hot air often has more dust. This embodiment is equipped with sack cleaner 30 between first cavity 8 and low temperature humid air storage chamber 7, is equipped with the automatic ware 31 that sweeps of dust on the sack cleaner 30, utilizes sack cleaner 30 and the automatic ware 31 that sweeps of dust to filter great particulate matter wind-dust. In addition, the evaporator unit is also provided with a cleaning water pump 35 for automatic cleaning, the cleaning water pump 35 is connected with a spray head 36 through a pipeline, and a spray nozzle of the spray head 36 faces the surface of the evaporator unit. When the dust concentration reaches a set limit value, the cleaning water pump is automatically started to clean the surface of the evaporator unit, and the cleaning water pump is used for cleaning dust attached to the surface of the evaporator unit so as to improve the conversion efficiency of the evaporator unit.

In order to avoid the over-high temperature inside the equipment, a refrigeration heat removal unit is also arranged, and comprises a dehumidification solenoid valve 37, an over-temperature protection solenoid valve 38, a heat removal condenser 39 and a condensation fan 33. One end of the heat-extraction condenser 39 is connected with the secondary compressor 19, the other end is connected with the secondary condenser 20, the dehumidification solenoid valve 37 is arranged between the secondary compressor 19 and the secondary condenser 20, the overtemperature protection solenoid valve 38 is arranged between the secondary compressor 19 and the heat-extraction condenser 39, and the condensation fan 33 is used for adjusting wind power and wind direction guided to pass through the heat-extraction condenser 39. The refrigeration heat rejection unit and the secondary refrigeration cycle system share the refrigeration unit.

As shown in fig. 3, the system further includes an information processing module and an image processing module, both the information processing module and the image processing module are connected with the PLC controller through a BP neural network, and the PLC controller is used for controlling the primary refrigeration cycle system and the secondary refrigeration cycle system.

The information processing module comprises a temperature and humidity sensor 25, a moisture detector 26, a pressure sensor 28 and a dust detector 29, the temperature and humidity sensor 25 is respectively arranged in the low-temperature humid air storage cavity 7 and the second cavity 9 and used for detecting the temperature and the humidity of the low-temperature humid air storage cavity 7 and the temperature and the humidity of the second cavity 9 in real time, and the moisture detector 26 is arranged at the discharging mechanism 6 and used for detecting the moisture content of the material in real time. The pressure sensors 28 are respectively arranged in the low-temperature humid air storage cavity 7 and the second cavity 9 and used for detecting and calculating the pressure difference between the low-temperature humid air storage cavity 7 and the second cavity 9 in real time, and the dust detector 29 is arranged in the low-temperature humid air storage cavity 7 and used for detecting the dust concentration of the low-temperature humid air storage cavity 7. Preferably, the pressure sensor 28 and the temperature and humidity sensor 25 are arranged between the secondary condenser 20 and the secondary fan 18 and on one side of the low-temperature humid air storage cavity 7 close to the second cavity 9, and the automatic dust blower 31 is in driving connection with the dust detector 29. The dust detector 29 is a TSP dust detection sensor.

The image processing module comprises a camera 27, and the camera 27 is used for acquiring the graphic image data of the materials transported by the upper layer mesh belt 4 and the lower layer mesh belt 5 in real time. The camera 27 is a CCD camera.

In this embodiment, the BP neural network specifically works as follows:

1. and constructing a BP neural network model and a teacher sample.

The BP neural network connects the neural network with an actual system through an error back propagation algorithm, the actual system is used as a teacher sample to provide an original parameter output expected value, and through training of sample data, the weight of the network is continuously corrected, and a proper neural network model is established.

2. The BP neural network comprises two processes of signal forward propagation and error backward propagation.

The forward propagation process is as follows:

input sample → input layer → hidden layers (processing) → output layer

If the output layer actual output does not match the expected output (teacher sample), then we go to error back propagation.

The error back propagation process is as follows:

output error (some form) → hidden layer (layer by layer) → input layer;

the output error is reversely transmitted, and the error is distributed to all units of each layer, so that error signals of the units of each layer are obtained, and further, the weight of each unit is corrected, and the process of weight adjustment is the reverse learning process of the network.

The method comprises the steps of firstly analyzing material property change and water content change through water content data and graphic image data collected by a water content detector 26 and a camera 27, then respectively transmitting the water content data and the graphic image data to a BP neural network through respective processing modules, constructing a BP network model by using a back propagation algorithm according to data information received by the BP neural network, manufacturing an output expected value of an original teacher sample, and turning into error back propagation if actual output of an output layer does not accord with the teacher sample.

Referring to fig. 3, the BP neural network is combined with the PLC controller to intelligently optimize and adjust the enabling parameters of the refrigeration system and the drying retention time. Analyzing the area, saturation, brightness, chroma and water content of the sludge fracture through the water content data and the graph image data acquired by the camera 27 and the water content detector 26, using the analyzed data as a sample input parameter of the BP neural network, analyzing and estimating the current water content of the mud cake, the water content of the current position and the original sample at the moment and the water content sampled by the water content detector 26 through comparing the analyzed data with the graph image data identified by the camera 27 on line, judging the drying effect of the period and the predicted drying effect or the predicted water content of the next period by combining the three data, and obtaining the time required for achieving the expected effect.

And if the sludge drying effect is worse than the expected effect, the rotating speed of the motor of the upper layer mesh belt 4 or the lower layer mesh belt 5 is reduced.

If the sludge drying effect reaches the expected effect, the rotating speed of the motor of the upper layer mesh belt 4 or the lower layer mesh belt 5 is kept unchanged.

If the sludge drying effect is higher than the expected effect, the motor rotating speed of the upper layer mesh belt 4 or the lower layer mesh belt 5 is increased, and meanwhile, an enabling switch (a refrigeration heat extraction unit) of the refrigeration system is started, so that the frequency reduction operation is realized, the energy is saved, and the consumption is reduced.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.