Semi-finish grinding equipment with waste heat recovery function and process

Abstract

The invention discloses a semi-finish grinding device and process with a waste heat recovery function, and relates to the technical field of semi-finish grinding equipment.The semi-finish grinding device comprises a weighing bin, a roller press, a primary sorting device, a ball mill and a vortex powder concentrator, the weighing bin can input materials quantitatively, the roller press conducts primary grinding on the materials, and the ball mill conducts secondary sorting on the materials; the primary sorting device can separate coarse powder, medium powder and fine powder, and can also effectively utilize low-temperature waste heat exhaust gas discharged by the mill tail of the ball mill and the vortex powder concentrator to dry materials, so that sensible heat and latent heat in the exhaust gas are fully utilized, a drying system does not need to be additionally built, the civil engineering cost is reduced, energy is saved, emission is reduced, and the production cost is reduced. Meanwhile, the air inlet temperature of the drying machine can be intelligently regulated and controlled in real time according to the heat discharged by the ball mill and the pressure difference change condition in the three-separation powder concentrator, so that dynamic optimization of heat energy utilization of the grinding system is achieved, the ball mill can conduct secondary grinding on materials, and the vortex powder concentrator can separate medium powder and fine powder.

Description

Technical Field

[0001] This invention relates to the field of semi-finished grinding equipment technology, specifically a semi-finished grinding equipment and process with waste heat recovery function. Background Technology

[0002] In cement production, grinding is a crucial step that determines product fineness, energy consumption, and production efficiency. Traditional grinding systems often employ open-circuit or closed-circuit grinding processes, but these suffer from high energy consumption, low grinding efficiency, and uneven particle size distribution. Semi-finished grinding processes typically consist of a combination of pre-grinding equipment and subsequent grinding equipment. The pre-grinding section uses roller presses or vertical mills to forcefully crush the material, forming a certain proportion of fine powder and easily grindable particles. These particles then enter a ball mill for further grinding. Since the material has already been partially crushed before entering the ball mill, the grinding load on the ball mill is significantly reduced, thereby achieving energy saving, consumption reduction, and increased output.

[0003] Existing technologies have some shortcomings. In traditional grinding systems, the low-temperature exhaust gas discharged from the ball mill tail and eddy current classifier is usually directly emitted, which not only causes a large amount of heat energy loss, but also increases the burden of exhaust gas treatment, resulting in high system energy consumption, high operating costs, and poor environmental protection effect. Summary of the Invention

[0004] The purpose of this invention is to solve the problem of waste heat in the prior art, and to propose a semi-finished grinding equipment and process with waste heat recovery function.

[0005] To solve the above problems, the present invention provides the following technical solution: a weighing bin is included, a roller press is installed on one side of the weighing bin, the weighing bin and the roller press are connected by a pipe, a primary sorting device is installed on one side of the roller press, a ball mill is installed on one side of the primary sorting device, the roller press and the primary sorting device are connected by a pipe, the primary sorting device and the ball mill are connected by a pipe, an eddy current classifier is installed on one side of the ball mill, the ball mill and the eddy current classifier are connected by a pipe, and the weighing bin, roller press, ball mill and eddy current classifier are connected to a control system. The primary sorting unit includes a support frame, a three-stage air classifier, a dryer, and a waste heat recovery mechanism. These components are mounted on the support frame. The three-stage air classifier and dryer are connected via pipelines, as are the dryer and waste heat recovery mechanism. The dryer is connected to the control system. After being metered in the weighing hopper, the material enters the roller press, where it is crushed. The three-stage air classifier separates the crushed material into coarse, medium, and fine powder. The coarse powder, after being dried in the dryer, returns to the weighing hopper to mix with the raw material and then re-enters the roller press for grinding. The medium powder enters the ball mill from the three-stage air classifier and, after grinding, enters the vortex air classifier. The fine powder is carried by the airflow through a bag filter and collected as finished product. The vortex air classifier further separates the incoming material into medium and fine powder. The medium powder re-enters the ball mill for grinding, while the fine powder is collected through the bag filter.

[0006] The three-stage air classifier includes an outer casing mounted on a support frame. One end of the casing has a feed inlet, and the other end has a coarse powder outlet. The coarse powder outlet is connected to the dryer via a pipe. An air inlet pipe and a cyclone separator are installed on the outside of the casing. The air inlet pipe is connected to the dryer's outlet, and the cyclone separator has an outlet pipe. A primary fan is installed on one side of the outlet pipe. A secondary sorting mechanism is installed inside the casing, and the primary fan is connected to the control system. When material enters the three-stage air classifier, the primary fan is activated, creating a vortex inside the casing.

[0007] The secondary sorting mechanism includes a feeding chamber connected to a feed inlet. A rotor is rotatably mounted on the outer casing. A guide plate with a conical surface is mounted on one end of the rotor. A hollow shaft is mounted on one end of the guide plate. A first transmission belt is mounted on the hollow shaft. A first driving component is mounted on the first transmission belt. A guide cylinder is mounted on the outer side of the rotor and installed on the inner wall of the outer casing. A guide plate with guide vanes is mounted circumferentially on the outer side of the guide cylinder. A conical plate with a discharge hole is mounted on one end of the guide cylinder. A first rotating shaft is rotatably mounted inside the hollow shaft. A second transmission belt is mounted on one end of the first rotating shaft. A second driving component is mounted on the second transmission belt. A spreading disc is mounted on the other end of the first rotating shaft. A medium powder discharge pipe is mounted on one end of the spreading disc. A discharge trough is provided on the spreading disc. The first and second driving components are connected to the control system. The first and second motors are started. The first motor drives the transmission belt to rotate, which in turn drives the hollow shaft to rotate. The hollow shaft then drives the rotor to rotate, which in turn drives the guide tube to rotate. The second motor drives the transmission belt to rotate, which in turn drives the first rotating shaft to rotate. The first rotating shaft then drives the spreading disc to rotate. The material enters the feeding chamber from the feed inlet and falls onto the guide plate. The material slides off the guide plate into the guide tube and falls along the conical plate. It then falls from the discharge hole onto the spreading disc, which disperses the material evenly. The coarse powder is discharged from the coarse powder outlet into the dryer. The medium and fine powders are carried into the rotor by the airflow. Under the action of centrifugal force, the medium powder falls through the discharge trough on the spreading disc into the medium powder discharge pipe and then into the ball mill. The fine powder is carried by the airflow through the center of the rotor and into the cyclone, and then discharged and collected.

[0008] The waste heat recovery mechanism includes a first recovery pipe and a second recovery pipe. A second fan is installed at one end of the first recovery pipe, and the second fan is installed on a vortex classifier. A third fan is installed at one end of the second recovery pipe, and the third fan is installed on a ball mill. The first and second recovery pipes are mounted on a support. A junction pipe is installed at the other end of the first and second recovery pipes, and the junction pipe is installed at the air inlet of a dryer. A temperature regulating unit is installed between the first and second recovery pipes. A pressure regulating unit is installed on one side of the first recovery pipe. The second and third fans are connected to a control system. The second blower is started, and it blows part of the hot gas (70°~90°) from the outlet of the vortex classifier into the first recovery pipe. The third blower blows part of the hot gas (80°~130°) from the outlet of the ball mill into the second recovery pipe. The hot gas in the first and second recovery pipes mixes in the junction pipe and enters the dryer. The coarse powder in the dryer is dried and then used as the sorting air to enter the air inlet pipe. At the same time, the material in the three-stage separation classifier is dried. The dried, humid hot gas with water vapor is discharged from the air outlet pipe.

[0009] The temperature control unit includes a branch pipe installed between the first and second recovery pipes. A connecting pipe is installed on the branch pipe, and a spiral tube is installed on one side of the connecting pipe. The spiral tube is installed inside the manifold pipe, and fins are installed on the surface of the spiral tube. A first and second fixed plates are installed inside the branch pipe. A slide rod is slidably installed on the first and second fixed plates. A moving block is installed at one end of the slide rod, and a push plate is installed on the slide rod. A bimetallic strip is installed between the first fixed plate and the push plate. An elastic element is sleeved on the outside of the slide rod. One end of the elastic element is installed on the push plate, and the other end of the elastic element is installed on the second fixed plate. A sliding groove is provided on the outside of the branch pipe, and a sealing element is installed in the sliding groove. When the temperature at the ball mill outlet exceeds the predetermined value, the bimetallic strip senses the increased temperature and continues to expand. The bimetallic strip drives the pusher plate to move closer to the second fixed plate, which in turn drives the slide rod to move closer to the second fixed plate. The slide rod then drives the moving block to move closer to the second fixed plate until the branch line is opened. A portion of the high-temperature gas flow from the second recovery pipe enters the spiral tube through the branch pipe connection pipe. The mixed gas flow in the confluence pipe exchanges heat with the spiral tube, increasing the temperature of the mixed gas flow and thus enhancing the drying capacity. When the temperature at the ball mill outlet is less than the predetermined value, the bimetallic strip contracts. The bimetallic strip drives the pusher plate to move away from the second fixed plate, which in turn drives the slide rod to move away from the second fixed plate. The slide rod then drives the moving block to move away from the second fixed plate until the branch line is closed, allowing all the gas to enter the second recovery pipe to concentrate the heat source, ensuring sufficient heat within the dryer and guaranteeing a stable drying process.

[0010] The pressure regulating unit includes a detection housing, a support plate mounted on the detection housing, the support plate mounted on a bracket, a diaphragm installed inside the detection housing, and a high-pressure pipe and a low-pressure pipe installed on the outside of the detection housing. The high-pressure pipe is connected to the air inlet pipe through a pipe, and the low-pressure pipe is connected to the air outlet pipe through a pipe. The high-pressure pipe and the low-pressure pipe are located on both sides of the diaphragm. A connecting rod is installed on the side of the diaphragm near the low-pressure pipe, and a pressure plate is installed on the connecting rod. The pressure plate slides in a sliding groove and abuts against a moving block. When the humidity inside the three-stage air separator is high, the gas pressure in the outlet pipe decreases while the gas pressure in the inlet pipe remains constant. This increases the pressure difference between the high-pressure and low-pressure pipes, causing the diaphragm to bulge towards the low-pressure pipe. The diaphragm then moves the connecting rod towards the first recovery pipe, which in turn moves the pressure plate towards the first recovery pipe. The pressure plate then moves the moving block towards the second fixed plate, opening the branch circuit and increasing the drying temperature to maintain drying intensity. When the humidity inside the three-stage air separator decreases significantly, the pressure difference between the high-pressure and low-pressure pipes decreases, closing the branch circuit and lowering the drying temperature to prevent over-drying and energy waste.

[0011] A first elevator is installed on one side of the weighing silo, connected to the silo via a pipe. A second elevator is installed at the bottom of the roller press, connected to the three-stage classifier via a pipe. A third elevator is installed at the bottom of the dryer, connected to the weighing silo via a pipe. A fourth elevator is installed on one side of the ball mill, connected to the eddy current classifier via a pipe. The first, second, third, and fourth elevators are connected to the control system. Material is fed into the weighing silo via the first elevator. The crushed material is fed into the three-stage classifier via the second elevator. The third elevator returns the coarse powder to the weighing silo. The fourth elevator feeds the medium powder ground by the ball mill into the eddy current classifier.

[0012] The elastic element includes a spring, the first driving element includes a first motor, and the second driving element includes a second motor. The sealing element, as the pressure plate moves, seals the pressure plate to prevent air leakage.

[0013] A semi-finished grinding process with waste heat recovery function includes the following steps: S1, First sorting; S2, Secondary sorting; S3, Waste heat recovery.

[0014] S1 includes the following steps: S101, The first elevator sends the material into the weighing bin, and the material in the weighing bin is weighed and then enters the roller press; S102, The roller press crushes the material by roller pressing, and the crushed material is sent to the three-stage separation classifier by the second elevator; S103. The material enters the feeding chamber from the feed inlet and falls onto the guide plate. The material slides from the guide plate into the guide tube and falls along the conical plate. It falls from the discharge hole onto the spreading plate. The rotating spreading plate disperses the material and spreads it evenly. The coarse powder is discharged from the coarse powder outlet into the dryer. After the coarse powder is dried in the dryer, the third elevator sends the coarse powder back to the weighing bin. The medium powder and fine powder are carried into the rotor by the airflow. The rotor rotates, and under the action of centrifugal force, the medium powder falls into the medium powder discharge pipe through the discharge chute on the spreading plate and into the ball mill. The fine powder is carried by the airflow through the center of the rotor and enters the cyclone. It passes through the bag filter and is then discharged and collected. S2 includes the following steps: S201. Medium powder enters the ball mill from the three-stage separator. After being ground by the ball mill, the fourth elevator sends the medium powder ground by the ball mill into the vortex separator. S202, the eddy current classifier separates the incoming material into medium powder and fine powder. The medium powder is then fed back into the ball mill for grinding, while the fine powder is collected by a bag filter. S3 includes the following steps: S301. The second blower blows part of the hot gas from the outlet of the vortex classifier into the first recovery pipe, and the third blower blows part of the hot gas from the outlet of the ball mill into the second recovery pipe. The hot gas in the first and second recovery pipes mixes in the junction pipe and enters the dryer. The coarse powder in the dryer is dried and then used as the sorting air to enter the air inlet pipe. At the same time, the material in the three-separation classifier is dried. The humid and hot gas with water vapor is discharged from the air outlet pipe after drying. S302. When the temperature discharged from the ball mill outlet exceeds the predetermined value, the bimetallic strip senses the increased temperature and continues to expand due to heat. The bimetallic strip drives the push plate to move closer to the second fixed plate, the push plate drives the slide rod to move closer to the second fixed plate, and the slide rod drives the moving block to move closer to the second fixed plate until the branch is opened. A portion of the high-temperature gas flow in the second recovery pipe enters the spiral tube from the branch pipe connecting pipe and then from the connecting pipe. The mixed gas flow in the confluence pipe exchanges heat with the spiral tube, increasing the temperature of the mixed gas flow. When the temperature discharged from the ball mill outlet is less than the predetermined value, the bimetallic strip contracts. The bimetallic strip drives the push plate to move away from the second fixed plate, the push plate drives the slide rod to move away from the second fixed plate, and the slide rod drives the moving block to move away from the second fixed plate until the branch is closed, allowing all the gas to enter the second recovery pipe and ensuring sufficient heat in the dryer. S303. When the humidity inside the three-stage air separator is high, the gas pressure in the outlet pipe decreases while the gas pressure in the inlet pipe remains unchanged. The pressure difference between the high-pressure and low-pressure pipes increases, causing the diaphragm to bulge towards the low-pressure pipe. The diaphragm then moves the connecting rod towards the first recovery pipe, which in turn moves the pressure plate towards the first recovery pipe. The pressure plate then moves the moving block towards the second fixed plate, opening the branch circuit and increasing the drying temperature. When the humidity inside the three-stage air separator decreases significantly, the pressure difference between the high-pressure and low-pressure pipes decreases, closing the branch circuit and lowering the drying temperature.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention adopts waste heat recovery technology, which can effectively utilize the low-temperature waste heat exhaust gas discharged from the ball mill tail and vortex classifier. The low-temperature gas generated in the ball mill system is sent to the dryer through pipeline to dry the material, so that the sensible heat and latent heat in the waste gas can be fully utilized. There is no need to build a separate drying system, which reduces civil engineering costs, lowers operating energy consumption, and protects the environment.

[0016] 2. This invention employs temperature and pressure regulation technology, which can intelligently control the inlet temperature of the dryer in real time based on the heat discharged from the ball mill and the pressure difference changes within the three-stage separator. This achieves dynamic optimization of the heat energy utilization of the grinding system. When the heat discharged from the ball mill is detected to be higher than a predetermined value, some high-temperature gas is allowed to enter the branch circulation, increasing the overall temperature flowing into the dryer and thus enhancing the drying capacity. When the heat discharged from the ball mill is lower than a predetermined value, all gas is allowed to enter the main path to concentrate the heat source, ensuring sufficient heat within the dryer and ensuring stable drying. Simultaneously, when the pressure difference within the separator increases, it indicates an increased drying load, and the drying temperature is automatically increased to maintain drying intensity. When the pressure difference decreases, the temperature is automatically reduced to prevent over-drying and energy waste. Attached Figure Description

[0017] Figure 1 This is a perspective view of the semi-finished grinding equipment of the present invention; Figure 2 This is a perspective view of the primary sorting device of the present invention; Figure 3 This is an internal schematic diagram of the three-stage air classifier of the present invention; Figure 4 This is an internal schematic diagram of the secondary sorting mechanism of the present invention; Figure 5 This is a perspective view of the waste heat recovery mechanism of the present invention; Figure 6 This is a cross-sectional view of the temperature regulating unit of the present invention; Figure 7 This is a schematic diagram of the internal structure of the pressure regulating unit of the present invention; In the diagram: 1. Weighing bin; 2. Roller press; 3. Primary sorting device; 31. Support frame; 32. Three-stage separator; 321. Outer shell; 322. Feed inlet; 323. Coarse powder outlet; 324. Air outlet pipe; 325. Cyclone separator; 326. Secondary sorting mechanism; 3261. Feed chamber; 3262. Guide plate; 3263. Guide tube; 3264. Rotor; 3265. Spreading disc; 3266. Medium powder outlet pipe; 3267. Guide vanes; 3268. First rotating shaft; 327. Air inlet pipe; 33. Dryer; 34. Waste heat recovery mechanism; 341. 342. Second recovery pipe; 343. Combination pipe; 344. Temperature control unit; 3441. Branch pipe; 3442. Connecting pipe; 3443. Spiral pipe; 3444. Moving block; 3445. First fixed plate; 3446. Bimetallic strip; 3447. Push plate; 3448. Second fixed plate; 3449. Sliding groove; 345. Pressure control unit; 3451. Detection housing; 3452. Low-pressure pipe; 3453. High-pressure pipe; 3454. Diaphragm; 3455. Connecting rod; 3456. Pressure plate; 4. Ball mill; 5. Eddy current classifier. Detailed Implementation

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

[0019] Example: Figures 1-7 As shown, the present invention provides a technical solution including a weighing bin 1, a roller press 2 installed on one side of the weighing bin 1, the weighing bin 1 and the roller press 2 connected by a pipe, a primary sorting device 3 installed on one side of the roller press 2, a ball mill 4 installed on one side of the primary sorting device 3, the roller press 2 and the primary sorting device 3 connected by a pipe, the primary sorting device 3 and the ball mill 4 connected by a pipe, an eddy current classifier 5 installed on one side of the ball mill 4, the ball mill 4 and the eddy current classifier 5 connected by a pipe, and the weighing bin 1, roller press 2, ball mill 4 and eddy current classifier 5 connected by a control system. A first elevator is installed on one side of weighing silo 1, and is connected to weighing silo 1 via a pipe. A second elevator is installed at the bottom of roller press 2, and is connected to three-stage classifier 32 via a pipe. A third elevator is installed at the bottom of dryer 33, and is connected to weighing silo 1 via a pipe. A fourth elevator is installed on one side of ball mill 4, and is connected to eddy current classifier 5 via a pipe. The first, second, third, and fourth elevators are connected to a control system. Material is fed into weighing silo 1 via the first elevator. The crushed material is fed into three-stage classifier 32 via the second elevator. The third elevator returns coarse powder to weighing silo 1. The fourth elevator feeds the medium powder ground by ball mill 4 into eddy current classifier 5.

[0020] The primary sorting device 3 includes a support 31, a three-stage air classifier 32, a dryer 33, and a waste heat recovery mechanism 34. The three-stage air classifier 32, the dryer 33, and the waste heat recovery mechanism 34 are mounted on the support 31. The three-stage air classifier 32 and the dryer 33 are connected by pipes. The dryer 33 and the waste heat recovery mechanism 34 are connected by pipes. The dryer 33 is connected to the control system. After being weighed in weighing bin 1, the material enters roller press 2, where it is crushed. Three-stage separation classifier 32 separates the crushed material into coarse powder, medium powder, and fine powder. The coarse powder is dried in dryer 33 and then returned to weighing bin 1 to mix with the raw material before entering roller press 2 again for grinding. The medium powder enters ball mill 4 from three-stage separation classifier 32 and is then ground in ball mill 4 before entering eddy current classifier 5. The fine powder is carried by airflow through bag filter and collected as finished product. Eddy current classifier 5 separates the incoming material into medium powder and fine powder. The medium powder is then ground again in ball mill 4, while the fine powder is collected through bag filter.

[0021] The three-stage separation classifier 32 includes a housing 321, which is mounted on a support 31. One end of the housing 321 has a feed inlet 322, and the other end has a coarse powder outlet 323. The coarse powder outlet 323 is connected to the dryer 33 via a pipe. An air inlet pipe 327 and a cyclone separator 325 are installed on the outside of the housing 321. The air inlet pipe 327 is installed at the air outlet of the dryer 33, and an air outlet pipe 324 is installed on the cyclone separator 325. A first fan is installed on one side of the air outlet pipe 324. A secondary separation mechanism 326 is installed inside the housing 321, and the first fan is connected to the control system. When material enters the three-stage separation classifier 32, the first fan is activated, creating a vortex inside the housing 321.

[0022] The secondary sorting mechanism 326 includes a feeding chamber 3261, which is connected to a feeding port 322. A rotor 3264 is rotatably mounted on the outer casing 321. A guide plate 3262 with a conical surface is mounted on one end of the rotor 3264. A hollow shaft is mounted on one end of the guide plate 3262, and a first transmission belt is mounted on the hollow shaft. A first driving component is mounted on the first transmission belt. A guide cylinder 3263 is mounted on the outer side of the rotor 3264 and is installed on the inner wall of the outer casing 321. A circumferentially mounted component is mounted on the outer side of the guide cylinder 3263. The guide plate and guide cylinder 3263 are equipped with guide vanes 3267. One end of the guide cylinder 3263 is equipped with a conical plate with a discharge hole. A first rotating shaft 3268 is rotatably mounted inside the hollow shaft. A second transmission belt is installed at one end of the first rotating shaft 3268, and a second driving component is installed on the second transmission belt. A spreading disc 3265 is installed at the other end of the first rotating shaft 3268. A medium powder discharge pipe 3266 is installed at one end of the spreading disc 3265, and a discharge chute is provided on the spreading disc 3265. The first and second driving components are connected to the control system. The first and second motors are started. The first motor drives the transmission belt to rotate, which in turn drives the hollow shaft to rotate. The hollow shaft then drives the rotor 3264 to rotate, which in turn drives the guide cylinder 3263 to rotate. The second motor drives the transmission belt to rotate, which in turn drives the first rotating shaft 3268 to rotate. The first rotating shaft 3268 then drives the spreading disc 3265 to rotate. Material enters the feeding chamber 3261 from the feed inlet 322 and falls onto the guide plate 3262. The material then slides from the guide plate 3262 into the guide cylinder 3263. The material falls along the conical plate and from the discharge hole onto the spreading plate 3265. The spreading plate 3265 disperses the material and spreads it evenly. The coarse powder is discharged from the coarse powder discharge port 323 into the dryer 33. The medium and fine powders are carried by the airflow into the rotor 3264. Under the action of centrifugal force, the medium powder falls through the discharge trough on the spreading plate 3265 into the medium powder discharge pipe 3266, and then falls into the ball mill 4 through the medium powder discharge pipe 3266. The fine powder is carried by the airflow through the center of the rotor 3264 and enters the cyclone 325, and then is discharged and collected.

[0023] The waste heat recovery mechanism 34 includes a first recovery pipe 341 and a second recovery pipe 342. A second fan is installed at one end of the first recovery pipe 341 and is mounted on the eddy current classifier 5. A third fan is installed at one end of the second recovery pipe 342 and is mounted on the ball mill 4. The first recovery pipe 341 and the second recovery pipe 342 are mounted on a support 31. A manifold 343 is installed at the other end of the first recovery pipe 341 and the second recovery pipe 342 and is mounted on the air inlet of the dryer 33. A temperature regulating unit 344 is installed between the first recovery pipe 341 and the second recovery pipe 342. A pressure regulating unit 345 is installed on one side of the first recovery pipe 341. The second fan and the third fan are connected to the control system. The second blower is started, and it blows part of the hot gas from the outlet of the vortex classifier 5 into the first recovery pipe 341. The third blower blows part of the hot gas from the outlet of the ball mill 4 into the second recovery pipe 342. The hot gas in the first recovery pipe 341 and the second recovery pipe 342 mix in the junction pipe 343 and enter the dryer 33. The coarse powder in the dryer 33 is dried and then used as sorting air to enter the air inlet pipe 327. At the same time, the material in the three-stage separation classifier 32 is dried. The dried, humid hot gas with water vapor is discharged from the air outlet pipe 324.

[0024] Temperature regulation unit 344 includes branch pipe 3441, which is installed between first recovery pipe 341 and second recovery pipe 342. A connecting pipe 3442 is installed on branch pipe 3441, and a spiral pipe 3443 is installed on one side of the connecting pipe 3442. The spiral pipe 3443 is installed inside the manifold pipe 343, and fins are installed on the surface of the spiral pipe 3443. A first fixing plate 3445 and a second fixing plate 3448 are installed inside branch pipe 3441. A slide rod is slidably mounted on the first fixed plate 3445 and the second fixed plate 3448. A moving block 3444 is mounted on one end of the slide rod, and a push plate 3447 is mounted on the slide rod. A bimetallic strip 3446 is installed between the first fixed plate 3445 and the push plate 3447. An elastic element is sleeved on the outside of the slide rod. One end of the elastic element is mounted on the push plate 3447, and the other end of the elastic element is mounted on the second fixed plate 3448. A sliding groove 3449 is provided on the outside of the branch pipe 3441, and a sealing element is installed in the sliding groove 3449. When the temperature discharged from the outlet of ball mill 4 exceeds the predetermined value, the bimetallic strip 3446 senses the increased temperature and continues to expand due to heat. The bimetallic strip 3446 drives the push plate 3447 to move closer to the second fixed plate 3448. The push plate 3447 drives the slide rod to move closer to the second fixed plate 3448. The slide rod drives the moving block 3444 to move closer to the second fixed plate 3448 until the branch is opened. A portion of the high-temperature airflow in the second recovery pipe 342 enters the spiral pipe 3443 from the branch pipe 3441 connecting pipe 3442 and then from the connecting pipe 3442. The mixed airflow in the confluence pipe 343... The spiral tube 3443 exchanges heat, increasing the temperature of the mixed gas flow, thereby enhancing the drying capacity. When the temperature discharged from the outlet of the ball mill 4 is lower than the predetermined value, the bimetallic strip 3446 contracts. The bimetallic strip 3446 drives the push plate 3447 to move away from the second fixed plate 3448. The push plate 3447 drives the slide rod to move away from the second fixed plate 3448. The slide rod drives the moving block 3444 to move away from the second fixed plate 3448 until the branch is closed, allowing all the gas to enter the second recovery pipe 342 to concentrate the heat source and ensure that the dryer 33 has sufficient heat to ensure the stable operation of the drying process.

[0025] The pressure regulating unit 345 includes a detection housing 3451, a support plate mounted on the detection housing 3451, the support plate being mounted on a bracket 31, a diaphragm 3454 installed inside the detection housing 3451, and a high-pressure pipe 3453 and a low-pressure pipe 3452 installed on the outside of the detection housing 3451. The high-pressure pipe 3453 is connected to the air inlet pipe 327 via a pipe, and the low-pressure pipe 3452 is connected to the air outlet pipe 324 via a pipe. The high-pressure pipe 3453 and the low-pressure pipe 3452 are located on both sides of the diaphragm 3454. A connecting rod 3455 is installed on the side of the diaphragm 3454 near the low-pressure pipe 3452, and a pressure plate 3456 is installed on the connecting rod 3455. The pressure plate 3456 slides within a sliding groove 3449 and abuts against a moving block 3444. When the humidity inside the three-stage air classifier 32 is high, the gas pressure in the outlet pipe 324 decreases, while the gas pressure in the inlet pipe 327 remains unchanged. The pressure difference between the gas in the high-pressure pipe 3453 and the low-pressure pipe 3452 increases, causing the diaphragm 3454 to bulge towards the side closer to the low-pressure pipe 3452. The diaphragm 3454 drives the connecting rod 3455 to move towards the first recovery pipe 341. The connecting rod 3455 drives the pressure plate 3456 to move towards the first recovery pipe 341. The pressure plate 3456 drives the moving block 3444 to move towards the second fixed plate 3448, opening the branch and increasing the drying temperature to maintain the drying intensity. When the humidity inside the three-stage air classifier 32 decreases significantly, the pressure difference between the gas in the high-pressure pipe 3453 and the low-pressure pipe 3452 decreases, closing the branch and lowering the drying temperature to prevent over-drying and energy waste. The seal, along with the movement of the pressure plate 3456, seals the pressure plate 3456 to prevent air leakage.

[0026] A semi-finished grinding process with waste heat recovery function includes the following steps: S1, First sorting; S2, Secondary sorting; S3, Waste heat recovery.

[0027] S1 includes the following steps: S101, The first elevator sends the material into the weighing bin 1, and the material in the weighing bin 1 is weighed and then enters the roller press 2; S102, the roller press 2 crushes the material by roller pressing, and the crushed material is sent into the three-stage separation classifier 32 by the second elevator; S103. Material enters the feed chamber 3261 through the feed inlet 322 and falls onto the guide plate 3262. The material slides from the guide plate 3262 into the guide cylinder 3263, falls along the conical plate, and falls from the discharge hole onto the spreading disc 3265. The rotating spreading disc 3265 disperses the material and spreads it evenly. Coarse powder is discharged from the coarse powder outlet 323 into the dryer 33. After being dried in the dryer 33, the coarse powder is then processed... The elevator sends the coarse powder back to the weighing bin 1. The medium and fine powders are carried by the airflow into the rotor 3264. The rotor 3264 rotates, and under the action of centrifugal force, the medium powder falls into the medium powder discharge pipe 3266 through the discharge chute on the feeding disc 3265. It then falls into the ball mill 4 through the medium powder discharge pipe 3266. The fine powder is carried by the airflow through the center of the rotor 3264 and enters the cyclone 325. It passes through the bag filter and is then discharged and collected. S2 includes the following steps: S201, medium powder enters ball mill 4 from three-stage separator 32. After being ground by ball mill 4, the fourth elevator sends the medium powder ground by ball mill 4 into vortex separator 5. S202, the eddy current classifier 5 separates the incoming material into medium powder and fine powder. The medium powder is then fed back into the ball mill 4 for grinding, while the fine powder is collected by a bag filter. S3 includes the following steps: S301, the second blower blows part of the hot gas from the outlet of the vortex classifier 5 into the first recovery pipe 341, and the third blower blows part of the hot gas from the outlet of the ball mill 4 into the second recovery pipe 342. The hot gas in the first recovery pipe 341 and the second recovery pipe 342 mix in the junction pipe 343 and enter the dryer 33. The coarse powder in the dryer 33 is dried and then used as the sorting air to enter the air inlet pipe 327. At the same time, the material in the three-separation classifier 32 is dried. The humid hot gas with water vapor after drying is discharged from the air outlet pipe 324. S302. When the temperature discharged from the outlet of ball mill 4 exceeds the predetermined value, the bimetallic strip 3446 senses the increased temperature and continues to expand due to heat. The bimetallic strip 3446 drives the push plate 3447 to move closer to the second fixed plate 3448. The push plate 3447 drives the slide rod to move closer to the second fixed plate 3448. The slide rod drives the moving block 3444 to move closer to the second fixed plate 3448 until the branch is opened. A portion of the high-temperature airflow in the second recovery pipe 342 enters the spiral pipe 3443 from the branch pipe 3441 connecting pipe 3442. In the middle, the mixed airflow in the manifold 343 exchanges heat with the spiral tube 3443, increasing the temperature of the mixed airflow. When the temperature discharged from the outlet of the ball mill 4 is less than the predetermined value, the bimetallic strip 3446 contracts. The bimetallic strip 3446 drives the push plate 3447 to move away from the second fixed plate 3448. The push plate 3447 drives the slide rod to move away from the second fixed plate 3448. The slide rod drives the moving block 3444 to move away from the second fixed plate 3448 until the branch is closed, so that all the gas enters the second recovery pipe 342, ensuring that the dryer 33 has sufficient heat. S303. When the humidity inside the three-stage air separator 32 is high, the gas pressure in the outlet pipe 324 decreases, while the gas pressure in the inlet pipe 327 remains unchanged. The pressure difference between the gas in the high-pressure pipe 3453 and the low-pressure pipe 3452 increases, causing the diaphragm 3454 to bulge towards the side closer to the low-pressure pipe 3452. The diaphragm 3454 drives the connecting rod 3455 to move towards the first recovery pipe 341. The connecting rod 3455 drives the pressure plate 3456 to move towards the first recovery pipe 341. The pressure plate 3456 drives the moving block 3444 to move towards the second fixed plate 3448, opening the branch and increasing the drying temperature. When the humidity inside the three-stage air separator 32 decreases significantly, the pressure difference between the gas in the high-pressure pipe 3453 and the low-pressure pipe 3452 decreases, closing the branch and lowering the drying temperature.

[0028] Working principle of the invention: In operation, the material is fed into the weighing bin 1 by the first elevator. After being weighed, the material enters the roller press 2, where it is crushed. The crushed material is then fed into the three-stage separator 32 by the second elevator. The first fan is started, creating a vortex inside the outer casing 321. Simultaneously, the first and second motors are started. The first motor drives the transmission belt, which in turn drives the hollow shaft, which in turn drives the rotor 3264. The rotor 3264 then drives the guide tube 3263. The second motor drives the transmission belt, which in turn drives the first rotating shaft 3268, which in turn drives the spreading disc 3265. The material enters from the feed inlet 322. The material enters the feed chamber 3261 and falls onto the guide plate 3262. The material slides from the guide plate 3262 into the guide cylinder 3263. The material falls along the conical plate and falls from the discharge hole onto the spreading plate 3265. The spreading plate 3265 disperses the material and spreads it evenly. The coarse powder is discharged from the coarse powder discharge port 323 into the dryer 33. The medium and fine powders are carried by the airflow into the rotor 3264. Under the action of centrifugal force, the medium powder falls through the discharge trough on the spreading plate 3265 into the medium powder discharge pipe 3266, and then into the ball mill 4. The fine powder is carried by the airflow through the center of the rotor 3264 and enters the cyclone 325. It passes through the bag filter and is then discharged and collected.

[0029] After the coarse powder is dried by dryer 33, the third elevator sends the coarse powder back to weighing bin 1, where it is mixed with the raw materials and then enters roller press 2 for grinding. The medium powder enters ball mill 4 from the three-stage separator 32. After being ground by ball mill 4, the fourth elevator sends the medium powder ground by ball mill 4 into eddy current separator 5. Eddy current separator 5 separates the incoming material into medium powder and fine powder. The medium powder enters ball mill 4 again for grinding, while the fine powder is collected by bag filter.

[0030] The second blower is started, and it blows part of the hot gas from the outlet of the vortex classifier 5 into the first recovery pipe 341. The third blower blows part of the hot gas from the outlet of the ball mill 4 into the second recovery pipe 342. The hot gas in the first recovery pipe 341 and the second recovery pipe 342 mix in the junction pipe 343 and enter the dryer 33. The coarse powder in the dryer 33 is dried and then used as sorting air to enter the air inlet pipe 327. At the same time, the material in the three-stage separation classifier 32 is dried. The dried, humid hot gas with water vapor is discharged from the air outlet pipe 324.

[0031] When the temperature discharged from the outlet of ball mill 4 exceeds the predetermined value, the bimetallic strip 3446 senses the increased temperature and continues to expand due to heat. The bimetallic strip 3446 drives the push plate 3447 to move closer to the second fixed plate 3448. The push plate 3447 drives the slide rod to move closer to the second fixed plate 3448. The slide rod drives the moving block 3444 to move closer to the second fixed plate 3448 until the branch is opened. A portion of the high-temperature airflow in the second recovery pipe 342 enters the spiral pipe 3443 from the branch pipe 3441 connecting pipe 3442 and then from the connecting pipe 3442. The mixed airflow in the confluence pipe 343... The spiral tube 3443 exchanges heat, increasing the temperature of the mixed gas flow, thereby enhancing the drying capacity. When the temperature discharged from the outlet of the ball mill 4 is lower than the predetermined value, the bimetallic strip 3446 contracts. The bimetallic strip 3446 drives the push plate 3447 to move away from the second fixed plate 3448. The push plate 3447 drives the slide rod to move away from the second fixed plate 3448. The slide rod drives the moving block 3444 to move away from the second fixed plate 3448 until the branch is closed, allowing all the gas to enter the second recovery pipe 342 to concentrate the heat source and ensure that the dryer 33 has sufficient heat to ensure the stable operation of the drying process.

[0032] When the humidity inside the three-stage air classifier 32 is high, the gas pressure in the outlet pipe 324 decreases, while the gas pressure in the inlet pipe 327 remains unchanged. The pressure difference between the gas in the high-pressure pipe 3453 and the low-pressure pipe 3452 increases, causing the diaphragm 3454 to bulge towards the side closer to the low-pressure pipe 3452. The diaphragm 3454 drives the connecting rod 3455 to move towards the first recovery pipe 341. The connecting rod 3455 drives the pressure plate 3456 to move towards the first recovery pipe 341. The pressure plate 3456 drives the moving block 3444 to move towards the second fixed plate 3448, opening the branch circuit and increasing the drying temperature to maintain the drying intensity. When the humidity inside the three-stage air classifier 32 decreases significantly, the pressure difference between the gas in the high-pressure pipe 3453 and the low-pressure pipe 3452 decreases, closing the branch circuit and reducing the drying temperature to prevent over-drying and energy waste.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A semi-finished grinding equipment with waste heat recovery function, characterized in that: The system includes a weighing bin (1), a roller press (2) installed on one side of the weighing bin (1), the weighing bin (1) and the roller press (2) are connected by a pipe, a primary sorting device (3) is installed on one side of the roller press (2), a ball mill (4) is installed on one side of the primary sorting device (3), the roller press (2) and the primary sorting device (3) are connected by a pipe, the primary sorting device (3) and the ball mill (4) are connected by a pipe, an eddy current classifier (5) is installed on one side of the ball mill (4), the ball mill (4) and the eddy current classifier (5) are connected by a pipe, and the weighing bin (1), roller press (2), ball mill (4) and eddy current classifier (5) are connected to a control system. The primary sorting device (3) includes a support (31), a three-stage air classifier (32), a dryer (33), and a waste heat recovery mechanism (34). The three-stage air classifier (32), the dryer (33), and the waste heat recovery mechanism (34) are mounted on the support (31). The three-stage air classifier (32) and the dryer (33) are connected by a pipe. The dryer (33) and the waste heat recovery mechanism (34) are connected by a pipe. The dryer (33) is connected to the control system.

2. The semi-finished grinding equipment with waste heat recovery function according to claim 1, characterized in that: The three-stage separation classifier (32) includes a housing (321), which is mounted on a support (31). One end of the housing (321) is equipped with a feed inlet (322), and the other end of the housing (321) is equipped with a coarse powder outlet (323). The coarse powder outlet (323) and the dryer (33) are connected by a pipe. An air inlet pipe (327) and a cyclone separator (325) are installed on the outside of the housing (321). The air inlet pipe (327) is installed on the air outlet of the dryer (33). An air outlet pipe (324) is installed on the cyclone separator (325). A first fan is installed on one side of the air outlet pipe (324). A secondary separation mechanism (326) is installed inside the housing (321). The first fan is connected to the control system.

3. A semi-finished grinding equipment with waste heat recovery function according to claim 2, characterized in that: The secondary sorting mechanism (326) includes a feeding chamber (3261) and a feeding port (322) connected together. A rotor (3264) is rotatably mounted on the outer shell (321). A guide plate (3262) is mounted on one end of the rotor (3264). The guide plate (3262) is conical. A hollow shaft is mounted on one end of the guide plate (3262). A first transmission belt is mounted on the hollow shaft. A first driving component is mounted on the first transmission belt. A guide cylinder (3263) is mounted on the outside of the rotor (3264). The guide cylinder (3263) is mounted on the inner wall of the outer shell (321). The outer side of the guide cylinder (3263) is... A guide plate is installed circumferentially, and a guide vane (3267) is installed on the guide cylinder (3263). A conical plate is installed at one end of the guide cylinder (3263), and a discharge hole is provided on the conical plate. A first rotating shaft (3268) is rotatably installed inside the hollow shaft. A second transmission belt is installed at one end of the first rotating shaft (3268), and a second driving component is installed on the second transmission belt. A spreading disc (3265) is installed at the other end of the first rotating shaft (3268), and a medium powder discharge pipe (3266) is installed at one end of the spreading disc (3265). A discharge trough is provided on the spreading disc (3265). The first driving component and the second driving component are connected to the control system.

4. A semi-finished grinding equipment with waste heat recovery function according to claim 3, characterized in that: The waste heat recovery mechanism (34) includes a first recovery pipe (341) and a second recovery pipe (342). A second fan is installed at one end of the first recovery pipe (341), and the second fan is installed on the vortex classifier (5). A third fan is installed at one end of the second recovery pipe (342), and the third fan is installed on the ball mill (4). The first recovery pipe (341) and the second recovery pipe (342) are installed on the bracket (31). A manifold (343) is installed at the other end of the first recovery pipe (341) and the second recovery pipe (342), and the manifold (343) is installed at the air inlet of the dryer (33). A temperature regulating unit (344) is installed between the first recovery pipe (341) and the second recovery pipe (342). A pressure regulating unit (345) is installed on one side of the first recovery pipe (341). The second fan and the third fan are connected to the control system.

5. A semi-finished grinding equipment with waste heat recovery function according to claim 4, characterized in that: The temperature regulating unit (344) includes a branch pipe (3441) installed between a first recovery pipe (341) and a second recovery pipe (342). A connecting pipe (3442) is installed on the branch pipe (3441), and a spiral pipe (3443) is installed on one side of the connecting pipe (3442). The spiral pipe (3443) is installed inside the manifold (343), and fins are installed on the surface of the spiral pipe (3443). A first fixing plate (3445) and a second fixing plate (3448) are installed inside the branch pipe (3441). A slide rod is slidably mounted on the first fixed plate (3445) and the second fixed plate (3448). A moving block (3444) is mounted on one end of the slide rod. A push plate (3447) is mounted on the slide rod. A bimetallic strip (3446) is installed between the first fixed plate (3445) and the push plate (3447). An elastic element is sleeved on the outside of the slide rod. One end of the elastic element is mounted on the push plate (3447), and the other end of the elastic element is mounted on the second fixed plate (3448). A sliding groove (3449) is provided on the outside of the branch pipe (3441), and a sealing element is installed in the sliding groove (3449).

6. A semi-finished grinding equipment with waste heat recovery function according to claim 4, characterized in that: The pressure regulating unit (345) includes a detection housing (3451), on which a support plate is mounted. The support plate is mounted on a bracket (31). A diaphragm (3454) is installed inside the detection housing (3451). A high-pressure pipe (3453) and a low-pressure pipe (3452) are installed on the outside of the detection housing (3451). The high-pressure pipe (3453) is connected to the air inlet pipe (327) via a pipe. The low-pressure pipe (3454) is connected to the air inlet pipe (327) via a pipe. 52) Connected to the air outlet pipe (324) via a pipe, the high pressure pipe (3453) and the low pressure pipe (3452) are located on both sides of the diaphragm (3454), a connecting rod (3455) is installed on the side of the diaphragm (3454) near the low pressure pipe (3452), a pressure plate (3456) is installed on the connecting rod (3455), the pressure plate (3456) slides in the sliding groove (3449), and the pressure plate (3456) abuts against the moving block (3444).

7. A semi-finished grinding equipment with waste heat recovery function according to claim 1, characterized in that: A first elevator is installed on one side of the weighing chamber (1), and the first elevator is connected to the weighing chamber (1) through a pipe. A second elevator is installed at the bottom of the roller press (2), and the second elevator is connected to the three-stage separation classifier (32) through a pipe. A third elevator is installed at the bottom of the dryer (33), and the third elevator is connected to the weighing chamber (1) through a pipe. A fourth elevator is installed on one side of the ball mill (4), and the fourth elevator is connected to the eddy current classifier (5) through a pipe. The first elevator, the second elevator, the third elevator and the fourth elevator are connected to the control system.

8. A semi-finished grinding equipment with waste heat recovery function according to claim 5, characterized in that: The elastic element includes a spring, the first driving element includes a first motor, and the second driving element includes a second motor.

9. A semi-finished grinding process with waste heat recovery function, characterized in that: The process includes the following steps: S1, First sorting; S2, Secondary sorting; S3, Waste heat recovery.

10. A semi-finished grinding process with waste heat recovery function according to claim 9, characterized in that: S1 includes the following steps: S101, The first elevator sends the material into the weighing bin (1), and the material in the weighing bin (1) is metered and then enters the roller press (2); S102, Roller press (2) crushes the material by roller pressing, and the crushed material is sent into the three-stage separation classifier (32) by the second elevator; S103. The material enters the feeding chamber (3261) through the feed inlet (322) and falls onto the guide plate (3262). The material slides down from the guide plate (3262) into the guide cylinder (3263). The material falls along the conical plate and falls from the discharge hole onto the spreading disc (3265). The rotating spreading disc (3265) disperses the material and spreads it evenly. The coarse powder is discharged from the coarse powder outlet (323) into the dryer (33). After the coarse powder is dried by the dryer (33), the first... The three elevators send the coarse powder back to the weighing bin (1), while the medium and fine powders are carried by the airflow into the rotor (3264). The rotor (3264) rotates, and under the action of centrifugal force, the medium powder falls into the medium powder discharge pipe (3266) through the discharge chute on the spreading plate (3265), and then falls into the ball mill (4) through the medium powder discharge pipe (3266). The fine powder is carried by the airflow through the center of the rotor (3264) and enters the cyclone (325), passes through the bag filter, and is then discharged and collected. S2 includes the following steps: S201. Medium powder enters the ball mill (4) from the three-stage separator (32). After being ground by the ball mill (4), the fourth elevator sends the medium powder ground by the ball mill (4) into the vortex separator (5). S202, the eddy current classifier (5) separates the incoming material into medium powder and fine powder. The medium powder is then ground again in the ball mill (4), and the fine powder is collected by the bag filter. S3 includes the following steps: S301, the second blower blows part of the hot gas from the outlet of the vortex classifier (5) into the first recovery pipe (341), and the third blower blows part of the hot gas from the outlet of the ball mill (4) into the second recovery pipe (342). The hot gas in the first recovery pipe (341) and the second recovery pipe (342) mix in the junction pipe (343) and enter the dryer (33). After drying the coarse powder in the dryer (33), it enters the air inlet pipe (327) as the sorting air. At the same time, it dries the material in the three-separation classifier (32). After drying, the humid hot gas with water vapor is discharged from the air outlet pipe (324). S302. When the temperature discharged from the ball mill (4) outlet exceeds the predetermined value, the bimetallic strip (3446) senses the increased temperature and continues to expand due to heat. The bimetallic strip (3446) drives the push plate (3447) to move closer to the second fixed plate (3448). The push plate (3447) drives the slide rod to move closer to the second fixed plate (3448). The slide rod drives the moving block (3444) to move closer to the second fixed plate (3448) until the branch is opened. A portion of the high-temperature airflow in the second recovery pipe (342) flows from the branch pipe (3441) to the connecting pipe (3442), and then from the connecting pipe (3442) into the spiral pipe (3443). In the ball mill (4), the mixed airflow in the manifold (343) exchanges heat with the spiral tube (3443) to increase the temperature of the mixed airflow. When the temperature discharged from the outlet of the ball mill (4) is less than the predetermined value, the bimetallic strip (3446) contracts. The bimetallic strip (3446) drives the push plate (3447) to move away from the second fixed plate (3448). The push plate (3447) drives the slide rod to move away from the second fixed plate (3448). The slide rod drives the moving block (3444) to move away from the second fixed plate (3448) until the branch is closed, so that all the gas enters the second recovery pipe (342) to ensure that the dryer (33) has enough heat. S303. When the humidity inside the three-stage air separator (32) is high, the gas pressure in the outlet pipe (324) decreases, the gas pressure in the inlet pipe (327) remains unchanged, the pressure difference between the high-pressure pipe (3453) and the low-pressure pipe (3452) increases, the diaphragm (3454) bulges towards the side closer to the low-pressure pipe (3452), the diaphragm (3454) drives the connecting rod (3455) to move towards the first recovery pipe (341), the connecting rod (3455) drives the pressure plate (3456) to move towards the first recovery pipe (341), the pressure plate (3456) drives the moving block (3444) to move towards the second fixed plate (3448), the branch is opened, and the drying temperature is increased. When the humidity inside the three-stage air separator (32) decreases significantly, the pressure difference between the high-pressure pipe (3453) and the low-pressure pipe (3452) decreases, the branch is closed, and the drying temperature is reduced.

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