A PVC drying control system

Abstract

The application discloses a PVC drying control system. The output end of a centrifugal machine is connected to the input end of a crusher, the output end of the crusher is connected to the first input end of a dryer, the first output end of the dryer is connected to the input end of a first cyclone separator, the second output end of the dryer is connected to the input end of a second feeder, the second feeder is provided with an online moisture analyzer, the output end of the second feeder is connected to the input end of a second cyclone separator, the first output end of the second cyclone separator is connected to the input end of a third feeder, the second output end of the second cyclone separator is connected to the second input end of a tail gas washing tower, and the output end of the third feeder is connected to the input end of a packaging bin together with a first conveying fan. Therefore, the moisture controller and the load controller can adjust the pressure and temperature in the dryer in real time, the labor intensity of the operator is reduced, the automatic control level is improved, and the energy consumption is reduced.

Description

Technical Field

[0001] This application relates to the field of polyvinyl chloride drying technology, and more particularly to a PVC drying control system. Background Technology

[0002] Polyvinyl chloride, or PVC for short, is widely used in industry, construction, agriculture, daily necessities, packaging, power, and public utilities. The purpose of drying PVC slurry is to remove moisture and other volatile substances from the slurry, bringing it to a suitable moisture content for processing. This step is crucial for subsequent PVC processing. If the moisture content of PVC products is too high, it can lead to problems such as bubbles, deformation, and reduced strength, affecting the product's appearance and internal quality. Therefore, drying PVC slurry is a critical pretreatment step that directly impacts the quality of the final product and production efficiency.

[0003] Existing PVC drying control systems rely on manual control of bed temperature, bed pressure, air temperature, air volume, and moisture content in the dryer. Additionally, manual control of the centrifuge feed rate is required, resulting in significant manual intervention, low production efficiency, and high energy consumption. Summary of the Invention

[0004] This application provides a PVC drying control system, which solves the technical problem of low production efficiency in existing PVC drying control systems due to excessive manual control of various control points and heavy human intervention.

[0005] This application provides a PVC drying control system including a centrifuge, a crusher, a dryer, a first cyclone separator, a first feeder, a tail gas scrubbing tower, a second feeder, an online moisture analyzer, a second cyclone separator, a third feeder, a first conveying fan, a packaging silo, a moisture controller, a load controller, a second conveying fan, and a total air temperature heat exchanger. The output end of the centrifuge is connected to the input end of the crusher, the output end of the crusher is connected to the first input end of the dryer, the first output end of the dryer is connected to the input end of the first cyclone separator, and the second output end of the dryer is connected to the input end of the second feeder. The second feeder is equipped with the online moisture analyzer, the output end of the second feeder is connected to the input end of the second cyclone separator, and the first output end of the second cyclone separator is connected to the input end of the third feeder. The second output terminal is connected to the second input terminal of the exhaust gas scrubbing tower. The output terminal of the third feeder and the first conveying fan are both connected to the input terminal of the packaging silo. The dryer is equipped with a steam regulating valve, a total thermometer, and a total pressure gauge. The second conveying fan is connected to the input terminal of the total air temperature heat exchanger, and the output terminal of the total air temperature heat exchanger is connected to the dryer. The total air temperature heat exchanger is equipped with a total temperature regulating valve. The first output terminal of the first cyclone separator is connected to the first input terminal of the exhaust gas scrubbing tower. The second output terminal of the first cyclone separator is connected to the input terminal of the first feeder, and the output terminal of the first feeder is connected to the second input terminal of the dryer. The moisture controller is electrically connected to the steam regulating valve, the total thermometer, the total temperature regulating valve, and the online moisture analyzer. The load controller is electrically connected to the centrifuge, the total pressure gauge, and the second feeder.

[0006] In one possible implementation, the PVC drying control system further includes an air filter connected to the input of the second cyclone separator.

[0007] In one possible implementation, the PVC drying control system further includes a third conveying fan and a fourth conveying fan; the input end of the third conveying fan is connected to the first output end of the first cyclone separator, and the output end of the third conveying fan is connected to the first input end of the exhaust gas scrubbing tower; the input end of the fourth conveying fan is connected to the second output end of the second cyclone separator, and the output end of the fourth conveying fan is connected to the second input end of the exhaust gas scrubbing tower.

[0008] In one possible implementation, the dryer includes a shell, a primary drying tube array, an intermediate drying tube array, and a secondary drying tube array; the primary drying tube array, the intermediate drying tube array, and the secondary drying tube array are all disposed within the shell and spaced apart along the length of the shell; the output end of the crusher is connected to a first input end of the shell, the output end of the first feeder is connected to a second input end of the shell, the first output end of the shell is connected to the input end of the first cyclone separator, and the second output end of the shell is connected to the input end of the second feeder; the total thermometer includes a primary thermometer, an intermediate thermometer, and a secondary thermometer; the primary drying tube array is equipped with the primary thermometer, and the intermediate drying tube array is equipped with... The system includes an intermediate bed thermometer and two bed drying tubes, each equipped with a second bed thermometer. The overall pressure gauge comprises a first pressure gauge and a second pressure gauge. The first pressure gauge is located on the first bed drying tube and the intermediate bed drying tube, and the second pressure gauge is located on the second bed drying tube. A moisture controller is electrically connected to the first bed thermometer, the intermediate bed thermometer, and the second bed thermometer. A load controller is electrically connected to the first pressure gauge and the second pressure gauge. A steam regulating valve is configured to regulate the steam pressure and flow rate of the first bed drying tube, the intermediate bed drying tube, and the second bed drying tube. The output of the overall air-temperature heat exchanger is connected to the first bed drying tube, the intermediate bed drying tube, and the second bed drying tube, respectively.

[0009] In one possible implementation, the total air temperature heat exchanger includes a first air temperature heat exchanger and a second air temperature heat exchanger; the input ends of both the first and second air temperature heat exchangers are connected to the second conveying fan; the output end of the first air temperature heat exchanger is connected to the first bed drying tube and the intermediate bed drying tube respectively; the output end of the second air temperature heat exchanger is connected to the second bed drying tube; the total temperature regulating valve includes a first temperature regulating valve and a second temperature regulating valve; the first air temperature heat exchanger is equipped with the first temperature regulating valve, and the second air temperature heat exchanger is equipped with the second temperature regulating valve.

[0010] In one possible implementation, the first bed drying tube, the intermediate bed drying tube, and the second bed drying tube are all drawer-type tubes.

[0011] In one possible implementation, the first conveying fan is an air-suspended fan.

[0012] In one possible implementation, the first cyclone separator is an eight-stage cyclone separator, and the second cyclone separator is a two-stage cyclone separator.

[0013] One or more technical solutions provided in the embodiments of this application have at least the following technical effects:

[0014] The PVC drying control system provided in this application includes a centrifuge, a crusher, a dryer, a first cyclone separator, a first feeder, a tail gas scrubbing tower, a second feeder, an online moisture analyzer, a second cyclone separator, a third feeder, a first conveyor fan, a packaging silo, a moisture controller, a load controller, a second conveyor fan, and a total air temperature heat exchanger. In actual operation, PVC slurry is dehydrated by the centrifuge to obtain PVC wet cake. The PVC wet cake enters the crusher for crushing. The crushed PVC is conveyed to the first input end of the dryer. Air is heated by the second conveyor fan and sent into the dryer after passing through the total air temperature heat exchanger. The dryer uses steam to heat the crushed PVC and perform high-temperature boiling to remove water. The dehydrated PVC is then conveyed to the input end of the second cyclone separator via the second feeder. The second cyclone separator performs gas-solid separation. The first output end of the second cyclone separator sends the separated PVC through the third feeder and the first conveyor fan. The gas is sent to the packaging silo; the second output of the second cyclone separator delivers gas carrying a trace amount of PVC to the second input of the tail gas scrubbing tower, where the gas is discharged and the PVC is stored; the gas in the dryer, carrying a portion of PVC, is delivered through the first output of the dryer to the first cyclone separator for gas-solid separation, and the separated PVC is delivered through the first feeder to the second input of the dryer. The separated gas, carrying a trace amount of PVC, is delivered to the first input of the tail gas scrubbing tower, where further gas-solid separation is performed, the gas is discharged, and the PVC is stored. In this embodiment, the online moisture analyzer transmits the PVC moisture content in the second feeder to the moisture controller in real time, and the total thermometer transmits the temperature data in the dryer to the moisture controller in real time. The moisture controller sends commands to the steam regulating valve and the total temperature regulating valve. The steam regulating valve is used to regulate the steam pressure in the dryer to control the temperature inside the dryer. In this embodiment, the pressure gauge transmits the pressure data in the dryer to the load controller in real time, and the load controller sends commands to the centrifuge current and the second feeder. Therefore, the moisture controller and load controller of this application can adjust the pressure and temperature inside the dryer in real time, reducing the labor intensity of operators, improving the level of automation control, and reducing energy consumption. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1This is a schematic diagram of the PVC drying control system provided in an embodiment of this application.

[0017] Figure reference numerals: 1-Centrifuge; 2-Crusher; 3-Dryer; 31-Shell; 32-First bed drying tube; 33-Intermediate bed drying tube; 34-Second bed drying tube; 35-Steam regulating valve; 36-Main thermometer; 361-First bed thermometer; 362-Intermediate bed thermometer; 363-Second bed thermometer; 37-Main pressure gauge; 371-First pressure gauge; 372-Second pressure gauge; 4-First cyclone separator; 5-First feeder; 6-Tail gas scrubbing tower; 7-Second feeder; 8- - Online moisture analyzer; 9- Second cyclone separator; 10- Third feeder; 11- First conveyor fan; 12- Packaging hopper; 13- Moisture controller; 14- Load controller; 15- Second conveyor fan; 16- Main air temperature heat exchanger; 161- First air temperature heat exchanger; 162- Second air temperature heat exchanger; 17- Main temperature regulating valve; 171- First temperature regulating valve; 172- Second temperature regulating valve; 18- Air filter; 19- Third conveyor fan; 20- Fourth conveyor fan. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0020] In this embodiment of the application, a PVC drying control system is provided, such as... Figure 1 As shown. The PVC drying control system includes a centrifuge 1, a crusher 2, a dryer 3, a first cyclone separator 4, a first feeder 5, a tail gas scrubbing tower 6, a second feeder 7, an online moisture analyzer 8, a second cyclone separator 9, a third feeder 10, a first conveying fan 11, a packaging silo 12, a moisture controller 13, a load controller 14, a second conveying fan 15, and a total air temperature heat exchanger 16.

[0021] The output of centrifuge 1 is connected to the input of crusher 2. The output of crusher 2 is connected to the first input of dryer 3. The first output of dryer 3 is connected to the input of first cyclone separator 4. The second output of dryer 3 is connected to the input of second feeder 7. Crusher 2 can accelerate the drying speed. Second feeder 7 is equipped with an online moisture analyzer 8. The output of second feeder 7 is connected to the input of second cyclone separator 9. The first output of second cyclone separator 9 is connected to the input of third feeder 10. The second output of second cyclone separator 9 is connected to the second input of exhaust gas scrubbing tower 6. The output of third feeder 10 and first conveyor fan 11 are both connected to the input of packaging silo 12. Packaging silo 12 is used to store dried PVC. The dryer 3 is equipped with a steam regulating valve 35, a total thermometer 36, and a pressure gauge 37. The second conveying fan 15 is connected to the input end of the total air temperature heat exchanger 16, and the output end of the total air temperature heat exchanger 16 is connected to the dryer 3. The total air temperature heat exchanger 16 is equipped with a total temperature regulating valve 17. The first output end of the first cyclone separator 4 is connected to the first input end of the tail gas scrubbing tower 6, the second output end of the first cyclone separator 4 is connected to the input end of the first feeder 5, and the output end of the first feeder 5 is connected to the second input end of the dryer 3. The moisture controller 13 is electrically connected to the steam regulating valve 35, the total thermometer 36, the total temperature regulating valve 17, and the online moisture analyzer 8. The load controller 14 is electrically connected to the centrifuge 1, the pressure gauge 37, and the second feeder 7. Further, in this embodiment, the online moisture analyzer 8 is inserted into the second feeder 7. The first cyclone separator 4, the first feeder 5, and the second feeder 7 are all connected by stainless steel pipes and flange bolts.

[0022] It should be noted that in actual operation, after the PVC slurry is dehydrated by centrifuge 1, a wet PVC cake is obtained. The wet PVC cake enters crusher 2 for crushing. The crushed PVC is then conveyed to the first input end of dryer 3. Air is heated by the second conveying fan 15 through the total air temperature heat exchanger 16 and sent into dryer 3. Dryer 3 uses steam to heat the crushed PVC and perform high-temperature boiling to remove water. The dehydrated PVC is then conveyed to the input end of the second cyclone separator 9 through the second feeder 7. The second cyclone separator 9 performs gas-solid separation. The first output end of the second cyclone separator 9 sends the separated PVC through the third feeder 10 and the first conveying fan 15 to the dryer 3. The blower 11 delivers the gas to the packaging silo 12; the second output of the second cyclone separator 9 delivers the gas carrying a trace amount of PVC to the second input of the tail gas scrubbing tower 6, where the tail gas scrubbing tower 6 discharges the gas and stores the PVC; the gas in the dryer 3, carrying a portion of PVC, is delivered to the first cyclone separator 4 through the first output of the dryer 3 for gas-solid separation, and the separated PVC is delivered to the second input of the dryer 3 through the first feeder 5. The separated gas, carrying a trace amount of PVC, is delivered to the first input of the tail gas scrubbing tower 6, where the tail gas scrubbing tower 6 further performs gas-solid separation, discharges the gas, and stores the PVC. In this embodiment, the online moisture analyzer 8 transmits the PVC moisture content in the second feeder 7 to the moisture controller 13 in real time, and the total thermometer 36 transmits the temperature data in the dryer 3 to the moisture controller 13 in real time. The moisture controller 13 sends commands to the steam regulating valve 35 and the total temperature regulating valve 17. The steam regulating valve 35 is used to regulate the steam pressure in the dryer 3 to control the temperature in the dryer 3. In this embodiment, the pressure gauge 37 transmits the pressure data within the dryer 3 to the load controller 14 in real time. The load controller 14 then sends commands to the centrifuge 1 and the second feeder 7. Therefore, the moisture controller 13 and the load controller 14 of this application can adjust the pressure and temperature within the dryer 3 in real time, reducing the labor intensity of operators, improving the level of automation control, and reducing energy consumption.

[0023] In this embodiment, the PVC drying control system further includes an air filter 18. The air filter 18 is connected to the input end of the second cyclone separator 9. The air filter 18 in this embodiment is used to filter impurities in the air, making the air entering the second cyclone separator 9 cleaner and preventing contamination of the dried PVC.

[0024] In this embodiment, the PVC drying control system further includes a third conveying fan 19 and a fourth conveying fan 20. The input end of the third conveying fan 19 is connected to the first output end of the first cyclone separator 4, and the output end of the third conveying fan 19 is connected to the first input end of the exhaust gas scrubbing tower 6. The input end of the fourth conveying fan 20 is connected to the second output end of the second cyclone separator 9, and the output end of the fourth conveying fan 20 is connected to the second input end of the exhaust gas scrubbing tower 6. The third conveying fan 19 and the fourth conveying fan 20 can more quickly transport gas carrying trace amounts of PVC into the exhaust gas scrubbing tower 6, improving overall operating efficiency.

[0025] In this embodiment, the dryer 3 includes a shell 31, a primary drying tube array 32, an intermediate drying tube array 33, and a secondary drying tube array 34. The primary drying tube array 32, intermediate drying tube array 33, and secondary drying tube array 34 are all disposed within the shell 31 and spaced apart along the length of the shell 31. The output end of the crusher 2 is connected to the first input end of the shell 31, the output end of the first feeder 5 is connected to the second input end of the shell 31, the first output end of the shell 31 is connected to the input end of the first cyclone separator 4, and the second output end of the shell 31 is connected to the input end of the second feeder 7. The total thermometer 36 includes a primary thermometer 361, an intermediate thermometer 362, and a secondary thermometer 363. The primary drying tube array 32 is equipped with a primary thermometer 361, the intermediate drying tube array 33 is equipped with an intermediate thermometer 362, and the secondary drying tube array 34 is equipped with a secondary thermometer 363. Moisture controller 13 is electrically connected to a first-bed thermometer 361, an intermediate-bed thermometer 362, and a second-bed thermometer 363. The master pressure gauge 37 includes a first pressure gauge 371 and a second pressure gauge 372. The first pressure gauge 371 is located on the first-bed drying tube 32 and the intermediate-bed drying tube 33, and the second pressure gauge 372 is located on the second-bed drying tube 34. Moisture controller 13 is electrically connected to the first-bed thermometer 361, the intermediate-bed thermometer 362, and the second-bed thermometer 363. Load controller 14 is electrically connected to the first pressure gauge 371 and the second pressure gauge 372. The first pressure gauge 371 and the second pressure gauge 372 transmit the pressure within the dryer 3 to the load controller 14 in real time.

[0026] Steam regulating valve 35 is configured to regulate the steam pressure of the primary drying tube 32, the intermediate drying tube 33, and the secondary drying tube 34. Steam regulating valve 35 is also configured to regulate the steam pressure and flow rate of the primary drying tube 32, the intermediate drying tube 33, and the secondary drying tube 34. The output terminals of the total air-temperature heat exchanger 16 are respectively connected to the primary drying tube 32, the intermediate drying tube 33, and the secondary drying tube 34.

[0027] It should be noted that the first-bed thermometer 361, the intermediate-bed thermometer 362, and the second-bed thermometer 363 in this embodiment are all sheath-type thermometers. The dryer 3 in this embodiment is a horizontal multi-chamber heated boiling bed dryer.

[0028] In this embodiment, the main air temperature heat exchanger 16 includes a first air temperature heat exchanger 161 and a second air temperature heat exchanger 162. The input terminals of both the first air temperature heat exchanger 161 and the second air temperature heat exchanger 162 are connected to a second conveying fan 15. The second conveying fan 15 delivers air to the input terminals of the first air temperature heat exchanger 161 and the second air temperature heat exchanger 162, respectively.

[0029] The output of the first air-temperature heat exchanger 161 is connected to the first bed drying tube 32 and the intermediate bed drying tube 33, respectively. The output of the second air-temperature heat exchanger 162 is connected to the second bed drying tube 34. The main temperature regulating valve 17 includes a first temperature regulating valve 171 and a second temperature regulating valve 172. The first air-temperature heat exchanger 161 is equipped with the first temperature regulating valve 171, and the second air-temperature heat exchanger 162 is equipped with the second temperature regulating valve 172. The first temperature regulating valve 171 and the second temperature regulating valve 172 control the temperatures of the first air-temperature heat exchanger 161 and the second air-temperature heat exchanger 162, respectively.

[0030] In this embodiment, the first bed drying tube 32, the intermediate bed drying tube 33, and the second bed drying tube 34 are all drawer-type tubes.

[0031] In this embodiment, the first conveying fan 11 is an air-suspended fan. The air-suspended fan in this embodiment is an adaptive load fan, which determines the load by the conveying pressure of the third feeder 10, thereby adjusting the fan's load and avoiding human intervention, thus reducing the labor intensity of operators. In the prior art, the first conveying fan 11 is a Roots blower, which has low efficiency, cannot meet production load requirements, and results in serious energy waste.

[0032] In this embodiment of the application, the first cyclone separator 4 is an eight-stage cyclone separator, and the second cyclone separator 9 is a two-stage cyclone separator.

[0033] In summary, the PVC drying control system of this application has the following advantages:

[0034] Achieving energy-saving benefits: This system can significantly improve the control quality of the production process, reduce fluctuations in key process variables, and improve overall stability; at the same time, it can improve the quality of PVC products and reduce energy consumption.

[0035] Achieve intelligent operation: Improve the level of automatic control of the system, implement intelligent systems in key operation procedures, and improve the overall level of enterprise intelligence.

[0036] Reduced labor intensity: Improving the level of system automation control reduces the labor intensity of operators, thereby significantly reducing the degree of human intervention.

[0037] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0038] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A PVC drying control system, characterized in that, Includes a centrifuge (1), a crusher (2), a dryer (3), a first cyclone separator (4), a first feeder (5), a tail gas scrubbing tower (6), a second feeder (7), an online moisture analyzer (8), a second cyclone separator (9), a third feeder (10), a first conveying fan (11), a packaging silo (12), a moisture controller (13), a load controller (14), a second conveying fan (15), and a total air temperature heat exchanger (16); The output end of the centrifuge (1) is connected to the input end of the crusher (2), the output end of the crusher (2) is connected to the first input end of the dryer (3), the first output end of the dryer (3) is connected to the input end of the first cyclone separator (4), and the second output end of the dryer (3) is connected to the input end of the second feeder (7). The second feeder (7) is equipped with the online moisture analyzer (8). The output end of the second feeder (7) is connected to the input end of the second cyclone separator (9). The first output end of the second cyclone separator (9) is connected to the input end of the third feeder (10). The second output end of the second cyclone separator (9) is connected to the second input end of the tail gas scrubbing tower (6). The output end of the third feeder (10) and the first conveying fan (11) are both connected to the input end of the packaging silo (12). The dryer (3) is equipped with a steam regulating valve (35), a total thermometer (36) and a pressure gauge (37). The second conveying fan (15) is connected to the input end of the total air temperature heat exchanger (16), the output end of the total air temperature heat exchanger (16) is connected to the dryer (3), and the total air temperature heat exchanger (16) is equipped with a total temperature regulating valve (17). The first output end of the first cyclone separator (4) is connected to the first input end of the tail gas scrubbing tower (6), the second output end of the first cyclone separator (4) is connected to the input end of the first feeder (5), and the output end of the first feeder (5) is connected to the second input end of the dryer (3). The moisture controller (13) is electrically connected to the steam regulating valve (35), the total thermometer (36), the total temperature regulating valve (17), and the online moisture analyzer (8). The load controller (14) is electrically connected to the centrifuge (1), the pressure gauge (37), and the second feeder (7); The online moisture analyzer (8) transmits the PVC moisture content in the second feeder (7) to the moisture controller (13) in real time. The total thermometer (36) transmits the temperature data in the dryer (3) to the moisture controller (13) in real time. The moisture controller (13) sends instructions to the steam regulating valve (35) and the total temperature regulating valve (17). The steam regulating valve (35) is used to regulate the steam pressure in the dryer (3) to control the temperature in the dryer (3). The pressure gauge (37) transmits the pressure data in the dryer (3) to the load controller (14) in real time. The load controller (14) sends instructions to the centrifuge (1) current and the second feeder (7).

2. The PVC drying control system according to claim 1, characterized in that, It also includes an air filter (18); The air filter (18) is connected to the input end of the second cyclone separator (9).

3. The PVC drying control system according to claim 1, characterized in that, It also includes a third conveying fan (19) and a fourth conveying fan (20); The input end of the third conveying fan (19) is connected to the first output end of the first cyclone separator (4), and the output end of the third conveying fan (19) is connected to the first input end of the tail gas scrubbing tower (6). The input end of the fourth conveying fan (20) is connected to the second output end of the second cyclone separator (9), and the output end of the fourth conveying fan (20) is connected to the second input end of the tail gas scrubbing tower (6).

4. The PVC drying control system according to claim 1, characterized in that, The dryer (3) includes a shell (31), a first bed of drying tubes (32), an intermediate bed of drying tubes (33), and a second bed of drying tubes (34). The first bed drying tube (32), the intermediate bed drying tube (33) and the second bed drying tube (34) are all disposed inside the housing (31) and are spaced apart along the length of the housing (31); The output end of the crusher (2) is connected to the first input end of the housing (31), the output end of the first feeder (5) is connected to the second input end of the housing (31), the first output end of the housing (31) is connected to the input end of the first cyclone separator (4), and the second output end of the housing (31) is connected to the input end of the second feeder (7). The total thermometer (36) includes a first bed thermometer (361), an intermediate bed thermometer (362), and a second bed thermometer (363). The first bed drying tube (32) is equipped with the first bed thermometer (361), the intermediate bed drying tube (33) is equipped with the intermediate bed thermometer (362), and the second bed drying tube (34) is equipped with the second bed thermometer (363). The pressure gauge (37) includes a first pressure gauge (371) and a second pressure gauge (372); The first pressure gauge (371) is installed in the first bed drying tube (32) and the intermediate bed drying tube (33), and the second pressure gauge (372) is installed in the second bed drying tube (34). The moisture controller (13) is electrically connected to the first bed thermometer (361), the intermediate bed thermometer (362), and the second bed thermometer (363). The load controller (14) is electrically connected to the first pressure gauge (371) and the second pressure gauge (372). The steam regulating valve (35) is configured to regulate the steam pressure and flow rate of the first bed drying tube (32), the intermediate bed drying tube (33) and the second bed drying tube (34); The output end of the total air temperature heat exchanger (16) is connected to the first bed drying tube (32), the intermediate bed drying tube (33) and the second bed drying tube (34), respectively.

5. The PVC drying control system according to claim 4, characterized in that, The total air temperature heat exchanger (16) includes a first air temperature heat exchanger (161) and a second air temperature heat exchanger (162). The input end of the first air temperature heat exchanger (161) and the input end of the second air temperature heat exchanger (162) are both connected to the second conveying fan (15). The output end of the first air temperature heat exchanger (161) is connected to the first bed drying tube (32) and the intermediate bed drying tube (33), respectively. The output end of the second air temperature heat exchanger (162) is connected to the two-bed drying tube (34); The total temperature regulating valve (17) includes a first temperature regulating valve (171) and a second temperature regulating valve (172); The first air temperature heat exchanger (161) is equipped with the first temperature regulating valve (171), and the second air temperature heat exchanger (162) is equipped with the second temperature regulating valve (172).

6. The PVC drying control system according to claim 4, characterized in that, The first bed drying tube (32), the intermediate bed drying tube (33), and the second bed drying tube (34) are all drawer-type tubes.

7. The PVC drying control system according to claim 1, characterized in that, The first conveying fan (11) is an air suspension fan.

8. The PVC drying control system according to claim 1, characterized in that, The first cyclone separator (4) is an eight-stage cyclone separator, and the second cyclone separator (9) is a two-stage cyclone separator.

Images