Vacuum system for gypsum dehydration and process matching method

Abstract

The application provides a gypsum dehydration vacuum system and process matching method, and belongs to the technical field of vacuum dehydration, comprising a vacuum filter press, a gas-water separator, a vacuum buffer tank, a turbo vacuum pump, a PLC controller and a frequency converter, the PLC controller is connected with the vacuum filter press, the gas-water separator, the vacuum buffer tank, the turbo vacuum pump and the frequency converter respectively, the vacuum filter press is communicated with the gas-water separator through a first pipeline, the gas-water separator is communicated with the vacuum buffer tank through a second pipeline, the vacuum buffer tank is communicated with the turbo vacuum pump through a third pipeline, and the turbo vacuum pump is connected with the frequency converter. The vacuum pump system compares the data of the water content of gypsum, the thickness of gypsum, the service period of filter material, the vacuum degree and the air extraction amount in the vacuum filter press with the set value through the PLC controller, and then sends an instruction of adjusting the output frequency to the frequency converter, so that the vacuum degree and the air extraction amount of the vacuum pump are changed, the process requirement is accurately matched, and the operation efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vacuum dewatering, in particular to a gypsum dewatering vacuum system and process matching method. BACKGROUND

[0002] With the development of industry and the improvement of people's living standards, the demand for energy is increasing, and SO2 in coal-fired flue gas has become the main cause of air pollution. The gypsum desulfurization process is the most widely used desulfurization technology in the world. Limestone powder is added to water to form a slurry as an absorbent, which is pumped into the absorption tower and fully contacted with the flue gas. Sulfur dioxide in the flue gas and calcium carbonate in the slurry and air blown from the lower part of the tower undergo an oxidation reaction to form calcium sulfate. When the calcium sulfate reaches a certain saturation degree, it crystallizes to form dihydrate gypsum.

[0003] The gypsum desulfurization process uses a vacuum system for dewatering, that is, a vacuum pump is used to form negative pressure in the dewatering tank, thereby separating the water in the gypsum and making the gypsum reach a certain degree of dryness. As the core equipment of the gypsum dewatering process section, the water ring vacuum pump is currently used. However, the existing vacuum system using the water ring vacuum pump has the following shortcomings:

[0004] (1) Low running efficiency. The water ring vacuum pump is a volumetric vacuum pump, which has low running efficiency, poor energy utilization rate, and high energy consumption cost. Currently, the overall running efficiency of the water ring vacuum pump is between 40% and 55%, and the efficiency decreases significantly as the service life increases.

[0005] (2) Large water consumption during operation. The water ring vacuum pump is a volumetric vacuum pump, which requires water as the operating medium. The water quality and quantity must meet strict requirements, otherwise the running performance of the water ring vacuum pump will be affected. In addition, the water quality can cause the water ring vacuum pump cavity to be easily scaled, which has a great impact on the running performance and service life of the water ring vacuum pump.

[0006] (3) Poor process matching. The water ring vacuum pump generally uses a coupling or a belt drive and runs at a constant speed, which has poor adaptability to working conditions and cannot change with the needs of the process system.

[0007] With the increase of energy costs, there is an urgent need for energy saving and consumption reduction of the water ring vacuum pump. Therefore, a gypsum dewatering vacuum system and process matching method are needed. SUMMARY

[0008] The purpose of the present application is to provide a gypsum dewatering vacuum system and process matching method, which solves the technical problems of low running efficiency, large water consumption during operation, and poor process matching of the existing vacuum system using the water ring vacuum pump. The vacuum system of the present application uses a turbine vacuum pump, which does not need water as a medium, has high running efficiency, and good process matching, and is suitable for wide use.

[0009] To achieve the above object, the technical scheme adopted by the present application is as follows:

[0010] A vacuum system for gypsum dehydration comprises a vacuum filter press, an air-water separator, a vacuum buffer tank, a turbo vacuum pump, a PLC controller and a frequency converter, the PLC controller is connected with the vacuum filter press, the air-water separator, the vacuum buffer tank, the turbo vacuum pump and the frequency converter respectively, the vacuum filter press is communicated with the air-water separator through a first pipeline, the air-water separator is communicated with the vacuum buffer tank through a second pipeline, the vacuum buffer tank is communicated with the turbo vacuum pump through a third pipeline, and the turbo vacuum pump is connected with the frequency converter.

[0011] Further, the first pipeline is provided with a first valve, the second pipeline is provided with a second valve, and the third pipeline is provided with a third valve.

[0012] Further, the inside of the vacuum filter press is provided with a capacitive moisture sensor, a photoelectric displacement sensor, a pressure sensor and a flow sensor respectively, and the capacitive moisture sensor, the photoelectric displacement sensor, the pressure sensor and the flow sensor are connected with the PLC controller respectively.

[0013] Further, the capacitive moisture sensor is used for monitoring the water content of gypsum in the vacuum filter press, the photoelectric displacement sensor is used for monitoring the thickness of gypsum in the vacuum filter press, the pressure sensor is used for monitoring the vacuum degree in the vacuum filter press, and the flow sensor is used for monitoring the air extraction amount in the vacuum filter press.

[0014] Further, the turbo vacuum pump comprises a base, a high-efficiency motor, a high-speed speed-up gear box and a pneumatic assembly, the base is provided with a motor support and an oil tank base respectively, the high-efficiency motor is fixedly connected on the motor support, the high-efficiency motor 42 is connected with the frequency converter 6, the high-speed speed-up gear box is fixedly connected on the oil tank base, and the two ends of the high-speed speed-up gear box are connected with the high-efficiency motor and the pneumatic assembly respectively.

[0015] Further, the high-speed speed-up gear box comprises a box body, intermediate shaft coupling side rolling bearings and intermediate shaft impeller side rolling bearings are mounted on the two sides of the middle part in the box body respectively, an intermediate shaft is arranged between the intermediate shaft coupling side rolling bearings and the intermediate shaft impeller side rolling bearings, a primary gear pair pinion and a secondary gear pair large gear are arranged on the intermediate shaft respectively.

[0016] Further, high-speed shaft coupling side sliding bearings and high-speed shaft impeller end sliding bearings are mounted on the two sides of the left end in the box body respectively, a high-speed gear shaft is arranged between the high-speed shaft coupling side sliding bearings and the high-speed shaft impeller end sliding bearings, a secondary gear pair pinion is arranged on the high-speed gear shaft, the secondary gear pair pinion is meshed and connected with the secondary gear pair large gear, and one end of the high-speed gear shaft is connected with the pneumatic assembly.

[0017] Further, the input shaft coupling end rolling bearing and the input shaft impeller end rolling bearing are respectively arranged on the two sides of the right end in the box body, and the input shaft is arranged between the input shaft coupling end rolling bearing and the input shaft impeller end rolling bearing, the first gear pair large gear is arranged on the input shaft, the first gear pair large gear is in meshing connection with the first gear pair small gear, one end of the input shaft is connected with the output shaft of the high-efficiency motor through the first coupling, and the other end of the input shaft is connected with the gear pump through the second coupling.

[0018] Further, the pneumatic assembly is connected with the centrifugal impeller and the volute, the centrifugal impeller is fixedly connected with the high-speed gear shaft through an external locking nut, the centrifugal impeller is rotatably arranged in the volute, the volute is fixedly connected with the box body through external bolts, and the axial end of the volute is provided with an air inlet, and the tangential end of the volute is provided with an air outlet.

[0019] A process matching method of a vacuum system for gypsum dehydration, comprising the following steps:

[0020] The water content of the gypsum is monitored, the PLC controller monitors the water content of the gypsum in the vacuum filter press through a capacitive moisture sensor and compares it with a set value, if the water content is less than 5% of the set value, the PLC controller sends a command to the frequency converter to reduce the output frequency to 90% of the set value; if the water content is higher than 5% of the set value, the PLC controller sends a command to the frequency converter to increase the output frequency to 110% of the set value;

[0021] The thickness of the gypsum is monitored, the PLC controller monitors the thickness of the gypsum in the vacuum filter press through a photoelectric displacement sensor and compares it with a set value, if the thickness is less than or equal to 95% of the set value, the PLC controller sends a command to the frequency converter to increase the output frequency to 110% of the set value; if the thickness is greater than 105% of the set value, the PLC controller sends a command to the frequency converter to reduce the output frequency to 90% of the set value;

[0022] The service life of the filter material is monitored, the PLC controller monitors and records the service life of the filter material in the vacuum filter press and compares it with a set value, if the service life is less than or equal to 20% of the set value, the PLC controller sends a command to the frequency converter to increase the output frequency to 105% of the set value; if the service life is greater than 20% of the set value and less than or equal to 90% of the set value, the frequency converter operates at the set value; if the service life is greater than 90% of the set value, the PLC controller sends a command to the frequency converter to reduce the output frequency to 95% of the set value;

[0023] The vacuum degree and the air extraction amount of the vacuum filter press are monitored and compared with the set value, the PLC controller monitors the vacuum degree and the air extraction amount in the vacuum filter press through the pressure sensor and the flow sensor respectively, if the product of the vacuum degree and the air extraction amount decreases by 10% of the set value, the PLC controller sends a command to the frequency converter to increase the output frequency to 105% of the set value, if the product of the vacuum degree and the air extraction amount increases by 10% of the set value, the PLC controller sends a command to the frequency converter to reduce the output frequency to 95% of the set value.

[0024] The present application has the following beneficial effects due to the adoption of the above technical solutions:

[0025] 1、The turbine vacuum pump in the vacuum pump system provided by the present application does not need water as a medium, so that the water consumption can be reduced, the operating speed of the high-efficiency motor is changed to change the working speed of the centrifugal impeller, so that the vacuum degree and the air extraction amount of the turbine vacuum pump are changed, the operating parameters of the turbine vacuum pump are more matched with the process requirements, and energy waste is avoided.

[0026] 2、The turbine vacuum pump in the vacuum pump system provided by the present application, after the PLC controller compares the data of the water content of the gypsum, the thickness of the gypsum, the service life of the filter material, the vacuum degree and the air extraction amount in the vacuum filter press with the set value, the PLC controller sends a command to the frequency converter to adjust the output frequency, so as to change the operating speed of the high-efficiency motor, change the working speed of the centrifugal impeller, and then change the vacuum degree and the air extraction amount of the vacuum pump, change the operating load of the turbine vacuum pump, and accurately match the process requirements, so that the operating efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of the vacuum system of the present application;

[0028] Figure 2 is a side view of the turbine vacuum pump of the present application;

[0029] Figure 3 is a structural schematic diagram of the turbine vacuum pump of the present application;

[0030] Figure 4 is a process matching flowchart of the present application.

[0031] In the drawings, 1-vacuum filter press, 2-gas water separator, 3-vacuum buffer tank, 4-turbine vacuum pump, 41-base, 42-high efficiency motor, 43-high speed gear box, 431-box, 432-intermediate shaft coupling side rolling bearing, 433-intermediate shaft impeller side rolling bearing, 434-intermediate shaft, 435-first gear pair pinion, 436-second gear pair gear, 437-high speed shaft coupling side sliding bearing, 438-high speed shaft impeller end sliding bearing, 439-high speed gear shaft, 440-second gear pair pinion, 441-input shaft coupling end rolling bearing, 442-input shaft impeller end rolling bearing, 443-input shaft, 444-first gear pair gear, 44-motor support, 45-tank base, 46-first coupling, 47-second coupling, 48-gear pump, 5-PLC controller, 6-frequency converter, 7-first pipeline, 8-second pipeline, 9-third pipeline, 11-capacitive water content sensor, 12-photoelectric displacement sensor, 13-pressure sensor, 14-flow sensor, 101-centrifugal impeller, 102-volute, 103-inlet, 104-outlet. DETAILED DESCRIPTION

[0032] To make the object, technical solutions and advantages of the present application clearer, further detailed description will be made below with reference to the drawings and preferred embodiments. However, it should be noted that many details listed in the description are only for the reader to have a thorough understanding of one or more aspects of the present application, and the aspects can be realized without these specific details.

[0033] As Figures 1-3 shown in the drawings, a vacuum system for gypsum dehydration includes a vacuum filter press 1, a gas water separator 2, a vacuum buffer tank 3, a turbine vacuum pump 4, a PLC controller 5 and a frequency converter 6, the PLC controller 5 is connected with the vacuum filter press 1, the gas water separator 2, the vacuum buffer tank 3, the turbine vacuum pump 4 and the frequency converter 6 respectively, the vacuum filter press 1 is communicated with the gas water separator 2 through a first pipeline 7, the gas water separator 2 is communicated with the vacuum buffer tank 3 through a second pipeline 8, the vacuum buffer tank 3 is communicated with the turbine vacuum pump 4 through a third pipeline 9, and the turbine vacuum pump 4 is connected with the frequency converter 6. The vacuum filter press 1 dehydrates the water-containing gypsum under vacuum condition, water vapor enters the gas water separator 2 from the vacuum filter press, the gas water separator 2 separates the water vapor, and the water part flows out from the water outlet of the gas water separator 2 to avoid water entering the turbine vacuum pump to affect the operating performance, the gas enters the vacuum buffer tank 3 from the gas water separator 2, the vacuum buffer tank 3 can reduce the vacuum degree fluctuation of the system, stabilize the gas inlet condition of the turbine vacuum pump 4, ensure the operating stability of the turbine vacuum pump 4, and the gas enters the turbine vacuum pump 4, is accelerated and pressurized in the turbine vacuum pump 4, and is discharged to the atmosphere, so that the operating efficiency is high.

[0034] As Figure 1 shown, the first pipeline 7 is provided with a first valve 71, the second pipeline 8 is provided with a second valve 81, and the third pipeline 9 is provided with a third valve 91. The vacuum filter press 1 is provided with a capacitive moisture sensor 11, a photoelectric displacement sensor 12, a pressure sensor 13 and a flow sensor 14, respectively, and the capacitive moisture sensor 11, the photoelectric displacement sensor 12, the pressure sensor 13 and the flow sensor 14 are connected with the PLC controller 5, respectively. The capacitive moisture sensor 11 is used for monitoring the water content of the gypsum in the vacuum filter press 1 and transmitting the water content data of the gypsum to the PLC controller 5, the photoelectric displacement sensor 12 is used for monitoring the thickness of the gypsum in the vacuum filter press 1 and transmitting the thickness data of the gypsum to the PLC controller 5, the pressure sensor 13 is used for monitoring the vacuum degree in the vacuum filter press 1 and transmitting the vacuum degree data in the vacuum filter press 1 to the PLC controller 5, and the flow sensor 14 is used for monitoring the air extraction amount in the vacuum filter press 1 and transmitting the air extraction amount data in the vacuum filter press 1 to the PLC controller 5.

[0035] As Figure 2 shown, the turbine vacuum pump 4 includes a base 41, a high-efficiency motor 42, a high-speed speed-up gear box 43 and a pneumatic assembly, the base 41 is provided with a motor support 44 and an oil tank base 45, respectively, the high-efficiency motor 42 is fixedly connected to the motor support 44, and the high-efficiency motor 42 is connected with the frequency converter 6, the output frequency of the frequency converter 6 is adjusted to change the running speed of the high-efficiency motor 42, the high-speed speed-up gear box 43 is fixedly connected to the oil tank base 45, and the two ends of the high-speed speed-up gear box 43 are connected with the high-efficiency motor 42 and the pneumatic assembly, respectively, and the high-efficiency motor 42 drives the high-speed speed-up gear box 43 to move.

[0036] As Figure 3As shown, the high-speed gear box 43 includes a box body 431, an intermediate shaft coupling side rolling bearing 432 and an intermediate shaft impeller side rolling bearing 433 are respectively installed on the two sides of the middle part in the box body 431, an intermediate shaft 434 is arranged between the intermediate shaft coupling side rolling bearing 432 and the intermediate shaft impeller side rolling bearing 433, the intermediate shaft coupling side rolling bearing 432 and the intermediate shaft impeller side rolling bearing 433 are used to support the intermediate shaft 434 in the box body 431, a first gear pair pinion 435 and a second gear pair gear 436 are respectively arranged on the intermediate shaft 434, and the first gear pair pinion 435 and the second gear pair gear 436 are respectively connected on the intermediate shaft 434 through interference. A high-speed shaft coupling side sliding bearing 437 and a high-speed shaft impeller end sliding bearing 438 are respectively installed on the two sides of the left end in the box body 431, a high-speed gear shaft 439 is arranged between the high-speed shaft coupling side sliding bearing 437 and the high-speed shaft impeller end sliding bearing 438, the high-speed shaft coupling side sliding bearing 437 and the high-speed shaft impeller end sliding bearing 438 are used to support the high-speed gear shaft 439 in the box body 431, a second gear pair pinion 440 is arranged on the high-speed gear shaft 439, and the second gear pair pinion 440 is in meshing connection with the second gear pair gear 436, the high-speed gear shaft 439 is driven to rotate through the second gear pair pinion 440 and the second gear pair gear 436, and one end of the high-speed gear shaft 439 is connected with a pneumatic assembly. An input shaft coupling end rolling bearing 441 and an input shaft impeller end rolling bearing 442 are respectively installed on the two sides of the right end in the box body 431, an input shaft 443 is arranged between the input shaft coupling end rolling bearing 441 and the input shaft impeller end rolling bearing 442, the input shaft coupling end rolling bearing 441 and the input shaft impeller end rolling bearing 442 are used to support the input shaft 443 in the box body 431, a first gear pair gear 444 is arranged on the input shaft 443, and the first gear pair gear 444 is in meshing connection with the first gear pair pinion 435, the intermediate shaft 434 is driven to rotate through the first gear pair gear 444 and the first gear pair pinion 435, one end of the input shaft 443 is connected with an output shaft of a high-efficiency motor 42 through a first coupling 46, the high-efficiency motor 42 drives the input shaft 443 to rotate, the other end of the input shaft 443 is connected with a gear pump 48 through a second coupling 47, and the gear pump 48 is fixedly connected with the box body 431 through external bolts. The pneumatic assembly connection includes a centrifugal impeller 101 and a volute 102, the centrifugal impeller 101 is fixedly connected with the high-speed gear shaft 439 through an external locking nut, the centrifugal impeller 101 is rotatably arranged in the volute 102, the centrifugal impeller 101 adopts a three-dimensional flow centrifugal impeller, the pneumatic efficiency can reach more than 85%, the operation efficiency is high, the volute 102 is fixedly connected with the box body 431 through external bolts, an air inlet 103 is arranged at the axial end of the volute 102, and an air outlet 104 is arranged at the tangential end of the volute 102.The high-efficiency motor 42 drives the input shaft 443 to rotate, the input shaft 443 drives the intermediate shaft 434 to rotate, so that the intermediate shaft 434 drives the high-speed gear shaft 439 to rotate, the high-efficiency motor torque is transmitted to the high-speed gear shaft 439, the cantilever of the centrifugal impeller 101 is installed on the high-speed gear shaft 439, mechanical energy is converted into potential energy and internal energy of fluid, the running efficiency of the centrifugal impeller 101 and the high-efficiency motor 42 is adjusted through the high-speed gear box 43, so that the high-efficiency motor 42, the high-speed gear box 43 and the centrifugal impeller 101 all work in the best efficiency interval. In the vacuum pump system provided by the application, the turbine vacuum pump 4 does not need water as a medium, so that the water consumption can be reduced, and the problem that the energy consumption is increased due to the mismatch between the water supply and the running parameters of the vacuum pump is avoided; the turbine vacuum pump 4 has high intelligence, can adjust the output frequency through the frequency converter according to the process requirements, so as to change the running speed of the high-efficiency motor 42, the working speed of the centrifugal impeller 101, the vacuum degree and the air extraction capacity of the turbine vacuum pump 4, so that the running parameters of the turbine vacuum pump 4 are more matched with the process requirements, and energy waste is avoided.

[0037] A process matching method of a vacuum system for gypsum dehydration, comprising the following steps:

[0038] The water content of the gypsum is monitored, the PLC controller monitors the water content of the gypsum in the vacuum filter press through the capacitive moisture sensor and compares it with the set value, if the water content is lower than 5% of the set value, the PLC controller sends a command to the frequency converter to reduce the output frequency to 90% of the set value, so as to reduce the running speed of the high-efficiency motor, thereby reducing the working speed of the centrifugal impeller, and further reducing the vacuum degree and the air extraction capacity of the vacuum system, and reducing the running load of the turbine vacuum pump; if the water content is higher than 5% of the set value, the PLC controller sends a command to the frequency converter to increase the output frequency to 110% of the set value, so as to increase the running speed of the high-efficiency motor, thereby increasing the working speed of the centrifugal impeller, and further increasing the vacuum degree and the air extraction capacity of the system, and increasing the running load of the turbine vacuum pump;

[0039] The thickness of the gypsum is monitored, the PLC controller monitors the thickness of the gypsum in the vacuum filter press through the photoelectric displacement sensor and compares it with the set value, if the thickness is less than or equal to 95% of the set value, the PLC controller sends a command to the frequency converter to increase the output frequency to 110% of the set value, so as to increase the running speed of the high-efficiency motor, thereby increasing the working speed of the centrifugal impeller, and further increasing the vacuum degree and the air extraction capacity of the vacuum system, and increasing the running load of the turbine vacuum pump; if the thickness is greater than 105% of the set value, the PLC controller sends a command to the frequency converter to reduce the output frequency to 90% of the set value, so as to reduce the running speed of the high-efficiency motor, thereby reducing the working speed of the centrifugal impeller, and further reducing the vacuum degree and the air extraction capacity of the system, and reducing the running load of the turbine vacuum pump;

[0040] The use cycle of the filter material is monitored, and the air permeability of the filter material changes with the change of the use cycle, the PLC controller monitors and records the use cycle of the filter material in the vacuum filter press and compares with the set value, if the use cycle is less than or equal to 20% of the set value, the air permeability of the filter material is good, and when the set vacuum degree is reached, the air extraction amount of the turbo vacuum pump will increase, and the PLC controller sends a command to the frequency converter to increase the output frequency to 105% of the set value; if the use cycle is greater than 20% of the set value and less than or equal to 90% of the set value, the filter material is in the best use cycle at this time, and the frequency converter operates at the set value; if the use cycle is greater than 90% of the set value, the air permeability of the filter material will become poor due to blockage, and under the premise of reaching the same vacuum degree, the air extraction amount will decrease, and the PLC controller sends a command to the frequency converter to reduce the output frequency to 95% of the set value;

[0041] The vacuum degree and the air extraction amount of the vacuum filter press are monitored, and the PLC controller monitors the vacuum degree and the air extraction amount in the vacuum filter press through the pressure sensor and the flow sensor respectively and compares with the set value, if the product of the vacuum degree and the air extraction amount decreases by 10% of the set value, the PLC controller sends a command to the frequency converter to increase the output frequency to 105% of the set value; if the product of the vacuum degree and the air extraction amount increases by 10% of the set value, the PLC controller sends a command to the frequency converter to reduce the output frequency to 95% of the set value.

[0042] The vacuum pump system adopts a negative feedback closed loop regulation mode, the PLC controller monitors the water content of the gypsum, the thickness of the gypsum, the use cycle of the filter material and the product change of the vacuum degree and the air extraction amount of the vacuum filter press, and sends a command to the frequency converter to adjust the output frequency F of the frequency converter, so as to change the running speed of the high-efficiency motor, and then change the working speed of the centrifugal impeller, so that the vacuum degree and the air extraction amount of the turbo vacuum pump are adjusted to meet the condition that the turbo vacuum pump runs in the best efficiency interval under different loads, and the process demand parameters are accurately matched.

[0043] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A vacuum system for gypsum dewatering, characterized by: The system comprises a vacuum filter (1), a gas-water separator (2), a vacuum buffer tank (3), a turbine vacuum pump (4), a PLC controller (5) and a frequency converter (6), the PLC controller (5) is connected with the vacuum filter (1), the gas-water separator (2), the vacuum buffer tank (3), the turbine vacuum pump (4) and the frequency converter (6) respectively, the vacuum filter (1) is communicated with the gas-water separator (2) through a first pipeline (7), the gas-water separator (2) is communicated with the vacuum buffer tank (3) through a second pipeline (8), the vacuum buffer tank (3) is communicated with the turbine vacuum pump (4) through a third pipeline (9), and the turbine vacuum pump (4) is connected with the frequency converter (6); The vacuum filter (1) is provided with a capacitive moisture sensor (11), a photoelectric displacement sensor (12), a pressure sensor (13) and a flow sensor (14) respectively, and the capacitive moisture sensor (11), the photoelectric displacement sensor (12), the pressure sensor (13) and the flow sensor (14) are connected with the PLC controller (5) respectively; The process matching method of the gypsum dehydration vacuum system comprises the following steps: The water content of the gypsum is monitored, the PLC controller monitors the water content of the gypsum in the vacuum filter through the capacitive moisture sensor and compares it with the set value, if the water content is lower than 5% of the set value, the PLC controller sends a command to the frequency converter to reduce the output frequency to 90% of the set value, if the water content is higher than 5% of the set value, the PLC controller sends a command to the frequency converter to increase the output frequency to 110% of the set value; The thickness of the gypsum is monitored, the PLC controller monitors the thickness of the gypsum in the vacuum filter through the photoelectric displacement sensor and compares it with the set value, if the thickness is less than or equal to 95% of the set value, the PLC controller sends a command to the frequency converter to increase the output frequency to 110% of the set value, if the thickness is greater than 105% of the set value, the PLC controller sends a command to the frequency converter to reduce the output frequency to 90% of the set value; The service cycle of the filter material is monitored, the PLC controller monitors and records the service cycle of the filter material in the vacuum filter and compares it with the set value, if the service cycle is less than or equal to 20% of the set value, the PLC controller sends a command to the frequency converter to increase the output frequency to 105% of the set value, if the service cycle is greater than 20% of the set value and less than or equal to 90% of the set value, the frequency converter operates at the set value, if the service cycle is greater than 90% of the set value, the PLC controller sends a command to the frequency converter to reduce the output frequency to 95% of the set value; The vacuum degree and the air extraction amount of the vacuum filter are monitored, the PLC controller monitors the vacuum degree and the air extraction amount in the vacuum filter through the pressure sensor and the flow sensor respectively and compares them with the set value, if the product of the vacuum degree and the air extraction amount decreases by 10% of the set value, the PLC controller sends a command to the frequency converter to increase the output frequency to 105% of the set value, if the product of the vacuum degree and the air extraction amount increases by 10% of the set value, the PLC controller sends a command to the frequency converter to reduce the output frequency to 95% of the set value.

2. A vacuum system for gypsum dehydration according to claim 1, characterized in that: The first pipeline (7) is provided with a first valve (71), the second pipeline (8) is provided with a second valve (81), and the third pipeline (9) is provided with a third valve (91).

3. A vacuum system for gypsum dehydration according to claim 1, characterized in that: The turbo vacuum pump (4) comprises a base (41), a high-efficiency motor (42), a high-speed speed-increasing gearbox (43) and a pneumatic assembly, the base (41) is provided with a motor support (44) and an oil tank base (45), the high-efficiency motor (42) is fixedly connected to the motor support (44), and the high-efficiency motor (42) is connected to a frequency converter (6), the high-speed speed-increasing gearbox (43) is fixedly connected to the oil tank base (45), and the two ends of the high-speed speed-increasing gearbox (43) are connected to the high-efficiency motor (42) and the pneumatic assembly respectively.

4. A vacuum system for gypsum dehydration according to claim 3, characterized in that: The high-speed speed-increasing gearbox (43) comprises a gearbox (431), intermediate shaft coupling side rolling bearings (432) and intermediate shaft impeller side rolling bearings (433) are respectively arranged on the two sides of the middle part in the gearbox (431), an intermediate shaft (434) is arranged between the intermediate shaft coupling side rolling bearings (432) and the intermediate shaft impeller side rolling bearings (433), and a first gear pair pinion (435) and a second gear pair gear (436) are respectively arranged on the intermediate shaft (434).

5. A vacuum system for gypsum dehydration according to claim 4, characterized in that: High-speed shaft coupling side sliding bearings (437) and high-speed shaft impeller end sliding bearings (438) are respectively arranged on the two sides of the left end in the gearbox (431), a high-speed gear shaft (439) is arranged between the high-speed shaft coupling side sliding bearings (437) and the high-speed shaft impeller end sliding bearings (438), a second gear pair pinion (440) is arranged on the high-speed gear shaft (439), the second gear pair pinion (440) is meshed and connected with the second gear pair gear (436), and one end of the high-speed gear shaft (439) is connected to the pneumatic assembly.

6. A vacuum system for gypsum dehydration according to claim 4, characterized in that: Input shaft coupling end rolling bearings (441) and input shaft impeller end rolling bearings (442) are respectively arranged on the two sides of the right end in the gearbox (431), an input shaft (443) is arranged between the input shaft coupling end rolling bearings (441) and the input shaft impeller end rolling bearings (442), a first gear pair gear (444) is arranged on the input shaft (443), the first gear pair gear (444) is meshed and connected with the first gear pair pinion (435), one end of the input shaft (443) is connected to an output shaft of the high-efficiency motor (42) through a first coupling (46), and the other end of the input shaft (443) is connected with a gear pump (48) through a second coupling (47), and the gear pump (48) is fixedly connected to the gearbox (431) through external bolts.

7. A vacuum system for gypsum dehydration according to claim 3, characterized in that: The pneumatic assembly comprises a centrifugal impeller (101) and a volute (102), the centrifugal impeller (101) is fixedly connected to the high-speed gear shaft (439) through external locking nuts, the centrifugal impeller (101) is rotatably arranged in the volute (102), the volute (102) is fixedly connected to the gearbox (431) through external bolts, an air inlet (103) is arranged at an axial end of the volute (102), and an air outlet (104) is arranged at a tangential end of the volute (102).

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