Longitudinal pellet induration and cooling system and method of use thereof

Abstract

The application discloses a longitudinal pellet roasting and cooling system and an application method thereof, which comprises a drying conveyor, a longitudinal roasting tower and a plurality of longitudinal sectional cooling towers. The longitudinal roasting tower is connected with the drying conveyor. A material blocking valve is arranged between the longitudinal roasting tower and the drying conveyor. A spiral material guide plate is arranged in the longitudinal roasting tower. A material distributing valve and a gravity sensing assembly are arranged in the longitudinal roasting tower. A distributing ball pipe is connected with the longitudinal roasting tower. Each branch pipe on the distributing ball pipe is connected with a longitudinal sectional cooling tower in a downward inclined manner. The longitudinal sectional cooling tower comprises a tower body. A stopping section, first, second and third cooling sections and an exit section are arranged in the tower body. An air inlet valve and an air outlet valve are arranged in each cooling section. A cooling fan is arranged on the air inlet valve. An inlet and outlet water valve and an outlet gate mechanism are arranged on the exit section. A cooling carriage is movably arranged in the tower body. The longitudinal pellet roasting and cooling system has the advantages of low energy consumption, high pellet roasting efficiency and high cooling efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of metallurgy, in particular to a longitudinal pellet induration and cooling system and a method of using the same. BACKGROUND

[0002] Pellets are one of the important methods of agglomerating fine ores. The fine ores are mixed with a proper amount of water and binder to form green pellets with uniform viscosity and sufficient strength. After drying and preheating, the green pellets are indurated in an oxidizing atmosphere to form pellet ores.

[0003] Currently, a belt induration machine is commonly used for pellet production. The traditional belt induration machine is realized by a chain grate machine. When indurating the pellet ores, the green pellets are relatively static on the chain grate machine, and the heat and mass transfer are realized by the gas medium flowing upwards from the bottom to the green pellets to complete the drying, induration and cooling of the pellet ores. The traditional belt induration machine has the following defects: 1. Due to the high weight of the pellets accumulated on the belt machine (pallet car), a large driving force is required during the conveying process. In order to obtain a large driving force, the carrying capacity of the driving equipment needs to be improved, which increases the power consumption; 2. The pellet pile in the chain grate machine is basically static, which easily causes uneven heating of the inner and outer pellets during preheating and induration, affecting the quality of the final product; 3. During the cooling process, the traditional cooling technology is to use the airflow to pass through the material layer from bottom to top in the cooling section. During the cooling process, the airflow is first heated by the lower layer of pellets, so the temperature of the airflow flowing to the upper layer is high, which is not conducive to the cooling of the upper layer of pellets. It is necessary to prolong the residence time in the cooling section, which reduces the utilization rate of the equipment. SUMMARY

[0004] The purpose of the present application is to provide a longitudinal pellet induration and cooling system and a method of using the same, which can save energy and reduce consumption, heat uniformly and cool quickly and uniformly.

[0005] To achieve the above object, the technical scheme adopted by the present application is: a longitudinal pellet roasting and cooling system, comprising: a drying conveyor, a longitudinal roasting tower and a plurality of longitudinal sectional cooling towers, wherein the drying conveyor is provided with a blast drying section, an exhaust drying section, a flue and a discharge port, the longitudinal roasting tower is connected with the discharge port of the drying conveyor, a blocking valve is arranged between the longitudinal roasting tower and the drying conveyor, a preheating section and a roasting section are arranged in the longitudinal roasting tower from top to bottom, a preheating nozzle is arranged in the preheating section, a roasting nozzle is arranged in the roasting section, a spiral guide plate penetrating through the preheating section and the roasting section is arranged in the longitudinal roasting tower, a material distribution valve and a gravity sensing assembly capable of abutting against the spiral guide plate are arranged between the preheating section and the roasting section, a discharge header is connected with the roasting section of the longitudinal roasting tower, a discharge valve and a distribution ball pipe are arranged on the discharge header, a plurality of branch pipes are connected with the bottom of the distribution ball pipe, a distribution valve is arranged in each branch pipe, and each branch pipe is connected with a longitudinal sectional cooling tower in a downward and oblique manner, wherein the longitudinal sectional cooling tower comprises: a tower body connected with the branch pipe, a stopping section, a first cooling section, a second cooling section, a third cooling section and an exit section are arranged in the tower body from top to bottom, an inlet pipe connected with the branch pipe is arranged on the stopping section, an air inlet valve and an air outlet valve are symmetrically arranged in each cooling section, a cooling fan is arranged on the air inlet valve, an inlet and outlet water valve and an outlet gate mechanism are arranged on the exit section, a cooling carriage capable of ascending and descending with the change of water level is movably arranged in the tower body, a roller is rotatably arranged on the cooling carriage, a wind passing hole is arranged on the left and right side walls of the cooling carriage, a metal filter screen is arranged in the wind passing hole, an inverted conical inlet is arranged on the top wall of the cooling carriage, a sealing cover is connected with the inverted conical inlet through a conical thread, a first screwing mechanism capable of screwing or unscrewing the sealing cover from the inverted conical inlet is arranged on the top of the tower body, a second screwing mechanism and a trolley overturning mechanism capable of overturning the cooling carriage by 180° are arranged on the outside of the longitudinal sectional cooling tower.

[0006] Further, the aforementioned longitudinal pellet roasting and cooling system, wherein the air outlet valve in the first cooling section is connected with a first heat recovery branch pipe and a first heat recovery channel, the first heat recovery channel is connected with the roasting section, the air outlet valve in the second cooling section is connected with a second heat recovery branch pipe and a second heat recovery channel, the second heat recovery channel is connected with the preheating section, the air outlet valve in the third cooling section is connected with a third heat recovery branch pipe and a third heat recovery channel, the third heat recovery channel is connected with the drying conveyor, and a gas check valve and a temperature sensor are arranged on each heat recovery branch pipe.

[0007] Further, the aforementioned longitudinal pellet indurating and cooling system, wherein a plurality of air permeable holes with a diameter smaller than the pellet diameter are uniformly distributed on the valve plate of the material blocking valve; the material distributing valve comprises a cylinder seat, a distributing cylinder and a distributing rod, the cylinder seat is fixed on the outer sidewall of the longitudinal indurating tower, a plurality of distributing cylinders are fixed on the cylinder seat, a connecting plate is arranged between the piston rods of the distributing cylinders, a plurality of distributing rods are uniformly distributed on the connecting plate, the distributing rods are slidably arranged on the sidewall of the longitudinal indurating tower, the gap between every two adjacent distributing rods is smaller than the pellet diameter; the gravity sensing assembly comprises a pressure sensor and an arc-shaped bearing plate, the pressure sensor is fixed on the connecting plate, a plurality of guide rods are slidably arranged on the sidewall of the longitudinal indurating tower, the guide rods are horizontally aligned with the pressure sensor, a heat insulation pad is arranged on the outer end of the guide rod extending out of the longitudinal indurating tower, and the arc-shaped bearing plate is connected with the inner end of the guide rod located in the longitudinal indurating tower.

[0008] Further, the aforementioned longitudinal pellet indurating and cooling system, wherein a quadrangular boss is arranged at the center of the sealing cover, the first and second screwing mechanisms are the same in structure, and the first screwing mechanism is taken as an example, the first screwing mechanism comprises a cross slide, a rotating cylinder and a parallel clamp jaw, the cross slide is fixed on the top of the tower body, the rotating cylinder is arranged on the longitudinal slide of the cross slide, the parallel clamp jaw is arranged on the rotating table of the rotating cylinder, an anti-skid pad is arranged on the jaw wall of the parallel clamp jaw, and a cover shell is arranged on the top of the tower body to protect the first screwing mechanism.

[0009] Further, the aforementioned longitudinal pellet indurating and cooling system, wherein a guide groove is arranged on each of the left and right inner sidewalls of the tower body, the left and right ends of the cooling carriage are movably clamped in the two guide grooves, a plurality of first universal ball bearings are arranged on the front and rear sides of the cooling carriage, and the first universal ball bearings abut against the sidewall of the corresponding guide groove.

[0010] Further, the aforementioned longitudinal pellet indurating and cooling system, wherein two stop carriage cylinders are arranged on the left and right sidewalls of the stop carriage section, the piston rods of the stop carriage cylinders extend into the tower body, and a push plate is arranged on the piston rod of the stop carriage cylinder.

[0011] Further, the aforementioned longitudinal pellet indurating and cooling system, wherein a material guide hopper is arranged in the cooling carriage, the small-diameter end of the material guide hopper is welded with the inverted conical feeding port of the cooling carriage, and the large-diameter end of the material guide hopper is welded with the sidewall of the cooling carriage.

[0012] Further, the aforementioned longitudinal pellet indurating and cooling system, wherein the outlet gate mechanism comprises a gate, an upper rail and a lower rail, the width of the upper rail and the lower rail is greater than the thickness of the gate, a plurality of second universal ball bearings are arranged at the bottom of the gate, the gate is arranged in the lower rail through the second universal ball bearings and a gap is left between the gate and the lower rail, the top of the gate is movably arranged in the upper rail and a gap is left between the gate and the upper rail, a long through hole is formed in the upper rail, a chute is arranged on the upper rail at the front and back of the long through hole, a sliding seat is arranged in the two chutes and slides left and right, a servo motor and a screw seat are arranged on one sliding seat, a screw seat is arranged on the other sliding seat, a screw is rotatably arranged between the two screw seats, the servo motor is connected with the screw, two screw nuts are arranged at the front side of the top of the gate, the two screw nuts pass through the long through hole upwards and are threadedly connected with the screw, the screw nut can slide left and right in the long through hole, sealing strips are arranged around the side wall of the tower body close to the gate, and locking mechanisms that can force the gate to tightly adhere to the tower body are arranged on the upper rail and the lower rail.

[0013] Further, the aforementioned longitudinal pellet indurating and cooling system, wherein the locking mechanisms on the upper rail and the lower rail are the same, and the locking mechanism on the upper rail is taken as an example, the locking mechanism comprises a locking cylinder and a locking plate, the locking plate is slidably clamped in the upper rail and leaves a gap with the gate, the front and back ends of the locking plate extend out of the upper rail, and one locking cylinder is arranged on each of the front and back outer side walls of the tower body, and the piston rods of the two locking cylinders are connected with the front and back ends of the locking plate, respectively.

[0014] The application method of the longitudinal pellet indurating and cooling system comprises the following steps:

[0015] S1, the pellets enter the drying conveyor, are dried in sequence through the air blowing drying section and the air extraction drying section, and the waste gas generated during drying is discharged from the flue;

[0016] S2, the distributing valve in the longitudinal indurating tower abuts against the rotating material guide plate, the gravity sensing assembly starts to work, the dried pellets enter the spiral material guide plate of the longitudinal indurating tower through the discharge port of the drying conveyor, are blocked in the preheating section by the distributing valve, and the pellets on the spiral material guide plate in the preheating section abut against the gravity sensing assembly, when the pressure received by the gravity sensing assembly reaches a set value, the blocking valve is closed, the pellets in the drying conveyor no longer fall into the preheating section, the preheating section of the longitudinal indurating tower preheats the pellets in the preheating section, after the preheating is completed, the distributing valve is opened, the pellets in the preheating section enter the indurating section for induration, the distributing valve is closed again, the blocking valve is opened, and the pellets in the drying conveyor enter the preheating section for preheating;

[0017] S3, the cooling car is sent into the longitudinal segmented cooling tower, a large amount of water is injected into the longitudinal segmented cooling tower, the cooling car rises with the rising of the water level, when the cooling car rises into the car stopping section, the sealing cover on the cooling car is unscrewed open by the first screwing mechanism, then water injection is continued, the feeding pipe on the car stopping section extends into the inverted conical feeding port of the cooling car; after the pellets in the indurating section are indurated, the discharge valve and a distribution valve are opened, the high-temperature pellets in the indurating section will enter the corresponding cooling car in sequence through the discharge main pipe, the distribution ball pipe, the branch pipe and the feeding pipe, then part of the water is discharged, the cooling car is lowered to be separated from the feeding pipe, then the sealing cover is screwed on the inverted conical feeding port by the first screwing mechanism;

[0018] S4, part of the water is discharged, the cooling car is lowered into the first cooling section, the air outlet valve and the air inlet valve in the first cooling section are opened, and the cooling fan on the air inlet valve is started, the cooling fan on the air inlet valve sprays the cooling air into the cooling car through the air inlet valve and the air passing hole on the cooling car to cool the high-temperature pellets in the cooling car, the hot air formed by the heat exchange between the cooling air and the high-temperature pellets is discharged outwards through another air passing hole in the cooling car and the air outlet valve on the first cooling section, when the temperature of the high-temperature pellets is reduced to below 1000℃, the air outlet valve and the air inlet valve on the first cooling section are closed, and the cooling fan stops working; continue to discharge water, lower the cooling car into the second cooling section, open the air outlet valve and the air inlet valve in the second cooling section, and start the cooling fan on the air inlet valve, so that the high-temperature pellets in the cooling car are cooled, when the temperature of the high-temperature pellets is reduced to below 600℃, the air outlet valve and the air inlet valve on the second cooling section are closed, and the cooling fan stops working; continue to discharge water, lower the cooling car into the third cooling section, open the air outlet valve and the air inlet valve in the third cooling section, and start the cooling fan on the air inlet valve, so that the high-temperature pellets in the cooling car are cooled, when the temperature of the high-temperature pellets is reduced to below 150℃, the air outlet valve and the air inlet valve on the third cooling section are closed, and the cooling fan stops working;

[0019] S5, the water is completely discharged, the cooling car enters the car discharging section and falls to the bottom of the tower body, then the outlet gate mechanism is opened, the cooling car is first moved out of the tower body by the trolley turnover mechanism, then the sealing cover on the cooling car is unscrewed open by the second screwing mechanism, then the trolley turnover mechanism continues to drive the cooling car to move to the discharging station, the cooling car is turned over by 180°, the pellets in the cooling car fall into the discharging station, then it is turned over by 180° again, and is transported back to the second screwing mechanism to screw the sealing cover, then it is transported back to the tower body, the outlet gate mechanism is closed, a large amount of water is injected again, and the empty cooling car floats up to the car stopping section;

[0020] S6, when a certain longitudinal segmented cooling tower is in cooling work, the distribution valve on the branch pipe corresponding to the longitudinal segmented cooling tower is closed, and the distribution valve on the branch pipe corresponding to any other longitudinal segmented cooling tower is opened, so that the high-temperature pellets in the roasting section can enter the cooling car of the other longitudinal segmented cooling tower for segmented cooling.

[0021] The longitudinal pellet roasting and cooling system has the advantages that the preheating nozzles in the preheating section and the baking nozzles in the baking section of the longitudinal roasting tower can respectively preheat and bake the bottom of the corresponding spiral section of the spiral guide plate, the preheating nozzles or the baking nozzles can directly heat the upper pellets when the pellets roll and accumulate on the spiral guide plate, and the preheating nozzles or the baking nozzles heat the bottom of the spiral guide plate and then heat the bottom pellets through heat conduction, so that the pellets in the longitudinal roasting tower are uniformly heated, thereby improving the roasting quality and efficiency of the pellets; the pellets enter the cooling car and are subjected to segmented cooling in the longitudinal segmented cooling tower, first, the water level is used to lift and lower the cooling car, thereby solving the defect that the traditional chain grate needs to use a large amount of electric energy, and the water in the longitudinal segmented cooling tower can be recycled, so that a large amount of water resources are not wasted; second, after the pellets enter the cooling car, the bottom pellets in the cooling car can exchange heat with the external water, thereby improving the cooling efficiency of the bottom pellets, and the temperature of the bottom pellets does not easily affect the upper pellets when the upper pellets are subjected to air cooling, thereby improving the cooling efficiency of the upper pellets and the overall cooling efficiency; the longitudinal roasting tower is matched with multiple longitudinal segmented cooling towers, so that multiple batches of pellets can be cooled at the same time, thereby ensuring the cooling efficiency and the equipment utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of the longitudinal pellet roasting and cooling system.

[0023] Figure 2 is Figure 1 is a structural schematic view of the longitudinal roasting tower.

[0024] Figure 3 is Figure 2 is a local enlarged structural schematic view in the A direction.

[0025] Figure 4 is Figure 2 is a structural schematic view of the distribution ball pipe.

[0026] Figure 5 is Figure 1 is a structural schematic view of the longitudinal segmented cooling tower.

[0027] Figure 6 Figure 5Fig. 6 is a schematic view of a structure of a middle part in a front view direction and a partial cross-sectional view.

[0028] Figure 7 Fig. 7 is a schematic view of a structure of a middle part in a front view direction and a partial cross-sectional view. Figure 5 Fig. 8 is a schematic view of a structure of a middle part in a front view direction and a partial cross-sectional view.

[0029] Figure 8 Fig. 9 is a schematic view of a structure of a middle part in a front view direction and a partial cross-sectional view. Figure 6 Fig. 10 is a schematic view of a structure of a middle part in a front view direction and a partial cross-sectional view.

[0030] Figure 9 Fig. 11 is a schematic view of a structure of a middle part in a front view direction and a partial cross-sectional view. Figure 5 Fig. 12 is a schematic view of a structure of a middle part in a front view direction and a partial cross-sectional view.

[0031] Figure 10 Fig. 13 is a schematic view of a structure of a middle part in a front view direction and a partial cross-sectional view. Figure 5 Fig. 14 is a schematic view of a structure of a middle part in a front view direction and a partial cross-sectional view.

[0032] Figure 11 Fig. 15 is a working condition diagram of a longitudinal sectional cooling tower when working in a sectional cooling mode. DETAILED DESCRIPTION

[0033] The technical solutions of the present application will be further described below in combination with the drawings and preferred embodiments.

[0034] As Figures 1-11As shown, the longitudinal pellet roasting and cooling system comprises a drying conveyor 1, a longitudinal roasting tower 2 and a plurality of longitudinal sectional cooling towers 3. The drying conveyor 1 is provided with a blast drying section 11, an induced-draft drying section 12, a flue 13 and a discharge port. The drying conveyor 1 is a prior art and is not described here. The longitudinal roasting tower 2 is connected to the discharge port of the drying conveyor 1 and is provided with a material blocking valve 21 between the longitudinal roasting tower 2 and the drying conveyor 1. The material blocking valve 21 in the embodiment can be selected from a butterfly valve or a gate valve. A plurality of air permeation holes with a diameter smaller than the diameter of the pellets are uniformly distributed on the valve plate of the material blocking valve 21. In this way, the waste gas generated in the heating process of the longitudinal roasting tower 2 can enter the flue 13 of the drying conveyor 1 through the air permeation holes on the valve plate and be discharged outward. A preheating section 22 and a roasting section 23 are sequentially arranged in the longitudinal roasting tower 2 from top to bottom. A plurality of preheating nozzles 221 are arranged in the preheating section 22, and a plurality of roasting nozzles 231 are arranged in the roasting section 23. A spiral material guide plate 24 is arranged in the longitudinal roasting tower 2 and penetrates the preheating section 22 and the roasting section 23. Each spiral section of the spiral material guide plate 24 located in the preheating section 22 corresponds to at least one preheating nozzle 221, and each spiral section of the spiral material guide plate 24 located in the roasting section 23 corresponds to at least one roasting nozzle 231. A material distribution valve 25 and a gravity sensing assembly 26 capable of abutting against the spiral material guide plate 24 are arranged between the preheating section 22 and the roasting section 23. The material distribution valve 25 comprises a cylinder seat 251, a distribution cylinder 252 and a distribution rod 253. The cylinder seat 251 is fixed on the outer side wall of the longitudinal roasting tower 2. A plurality of distribution cylinders 252 are fixed on the cylinder seat 251. A connecting plate 254 is arranged between the piston rods of the plurality of distribution cylinders 252. A plurality of distribution rods 253 are uniformly distributed on the connecting plate 254. The distribution rods 253 slide through the side wall of the longitudinal roasting tower 2. The gap between every two adjacent distribution rods 253 is smaller than the diameter of the pellets. In this way, after the distribution rods 253 abut against the spiral material guide plate 24, they can not only block and distribute the pellets but also allow the waste gas generated in the roasting section 23 to be discharged upward into the flue 13 of the drying conveyor 1 and discharged outward.The gravity sensing assembly 26 comprises a pressure sensor 261 and an arc-shaped bearing plate 262, the pressure sensor 261 is fixed on the connecting plate 254, the connecting plate 254 is slidably arranged on the sidewall of the longitudinal roasting tower 2 and is provided with a plurality of guide rods 263 which are horizontally aligned with the pressure sensor 261, a heat insulation pad is arranged on the outer end of the guide rod 263 which extends out of the longitudinal roasting tower 2, the arc-shaped bearing plate 262 is connected with the inner end of the guide rod 263 which is located in the longitudinal roasting tower 2, when the distribution cylinder 252 pushes the distribution rod 253, the pressure sensor 261 on the connecting plate 254 will push the guide rod 263 and the arc-shaped bearing plate 262 to move together, when the distribution rod 253 abuts against the spiral guide plate 24, the pressure sensor 261 will not push the guide rod 263 any more, the guide rod 263 will not push the pressure sensor 261 any more, the pressure sensor 261 will return to zero when it is not under pressure, the counterforce that the pressure sensor 261 receives when it pushes the guide rod 263 will not reach the set threshold value, so that when the pellets fall into the preheating section 22, the pellets will be blocked by the distribution rod 253 in the distribution valve 25, the blocked pellets will be accumulated on the spiral guide plate 24 in the preheating section 22 to push the arc-shaped bearing plate 262, the arc-shaped bearing plate 262 will push the pressure sensor 261 through the guide rod 263 after being pushed, the pressure sensor 261 can measure the total weight of the pellets in the preheating section 22, when the total weight measured by the pressure sensor 261 reaches the preset threshold value, the blocking valve 21 can be controlled to be closed, so that the pellets in the drying conveyor 1 will not fall into the preheating section 22 of the longitudinal roasting tower 2, the heat insulation pad on the guide rod 263 can prevent the high temperature from being transmitted to the pressure sensor 261 to cause damage to the pressure sensor 261.

[0035] The longitudinal baking tower 2 is connected with a discharge main pipe 27, and a discharge valve 271 and a distribution ball pipe 4 are arranged on the discharge main pipe 27. A plurality of branch pipes 41 are connected to the bottom of the distribution ball pipe 4, and a distribution valve 411 is arranged in each branch pipe 41. Each branch pipe 41 is connected to a longitudinal sectional cooling tower 3 in a downward inclined manner. The pellets in the longitudinal baking tower 2 are guided and conveyed by the spiral guide plate 24 into the discharge main pipe 27 and the distribution ball pipe 4. The pellets are accumulated at the bottom of the distribution ball pipe 4. Then, the distribution valve 411 of the corresponding branch pipe 41 is opened, and the pellets at the bottom of the distribution ball pipe 4 enter the corresponding branch pipe 41. Then, the pellets enter the corresponding longitudinal sectional cooling tower 3 in the branch pipe 41 by gravity. Therefore, an additional driving mechanism is not needed, the cost is reduced, and the pellets are not accumulated in the distribution ball pipe 4 to cause blockage. The longitudinal sectional cooling tower 3 comprises a tower body 31 connected to the branch pipe 41. A guide groove 311 is arranged on the left and right inner side walls of the tower body 31. A parking section 32, a first cooling section 33, a second cooling section 34, a third cooling section 35, and an exit section 36 are sequentially arranged in the tower body 31 from top to bottom. An inlet pipe 321 connected to the branch pipe 41 is arranged on the parking section 32. Two parking air cylinders 322 are arranged on the left and right side walls of the parking section 32. The piston rods of the parking air cylinders 322 extend into the tower body. A push plate 323 is arranged on the piston rod of the parking air cylinder 322. The inlet and outlet air valves 37 and 38 are symmetrically arranged in each cooling section. A cooling fan 371 is arranged on the inlet air valve 38. The outlet air valve 38 in the first cooling section 33 of each longitudinal sectional cooling tower 3 is connected to the first regenerative branch pipe 381, which is connected to the first regenerative channel 28. The first regenerative channel 28 is connected to the baking section 23. The outlet air valve 38 in the second cooling section 33 of each longitudinal sectional cooling tower 3 is connected to the second regenerative branch pipe 382, which is connected to the second regenerative channel 29. The second regenerative channel 29 is connected to the preheating section 22. The outlet air valve 38 in the third cooling section 35 of each longitudinal sectional cooling tower 3 is connected to the third regenerative branch pipe 383, which is connected to the third regenerative channel 14. The third regenerative channel 14 is connected to the drying conveyor 1. A gas check valve is arranged on each of the first, second, and third regenerative branch pipes 381, 382, and 383 to prevent the hot air in one longitudinal sectional cooling tower 3 from flowing back to another longitudinal sectional cooling tower 3 to affect the cooling effect. A temperature sensor is arranged on each of the first, second, and third regenerative branch pipes 381, 382, and 383. An inlet and outlet water valve 361 and an outlet gate mechanism 5 are arranged on the exit section 36. A three-way valve is arranged on the inlet and outlet water valve 361. An inlet water pipe and a return water pipe are connected to the three-way valve. The inlet water pipe and the return water pipe are connected to a water storage tank in circulation. That is, the water in the water storage tank can be injected into the tower body 31 through the inlet water pipe, the three-way valve, and the inlet and outlet water valve 361. The water in the tower body 31 can flow back to the water storage tank through the inlet and outlet water valve 361, the three-way valve, and the return water pipe.The outlet gate mechanism 5 comprises a gate 51, an upper rail 52 and a lower rail 53, the width of the upper rail 52 and the lower rail 53 is greater than the thickness of the gate 51, a plurality of second universal ball bearings 54 are arranged at the bottom of the gate 51 in a spaced manner, the gate 51 is arranged in the lower rail 53 through the second universal ball bearings 54 and a gap is left between the gate 51 and the lower rail 53, the top of the gate 51 is movably arranged in the upper rail 52 and a gap is left between the gate 51 and the upper rail 52, a long through hole 521 is formed in the upper rail 52, a sliding groove is arranged on the upper rail 52 at the front and back of the long through hole 521, a sliding seat 55 is slidably arranged in the two sliding grooves, a servo motor 551 and a screw rod seat 552 are arranged on one sliding seat 55, a screw rod seat 552 is arranged on the other sliding seat 55, a screw rod 553 is rotatably arranged between the two screw rod seats 552, the servo motor 551 is connected with the screw rod 553, two screw rod nuts 511 are arranged on the front side of the top of the gate 51, the two screw rod nuts 511 are threadedly connected with the screw rod 553 after being upwardly passed through the long through hole 521, the screw rod nut 511 can slide left and right in the long through hole 521, sealing strips 56 are arranged around the side wall of the tower body 31 close to the gate 51, the servo motor 551 drives the screw rod 553 to rotate, the rotating screw rod 553 drives the two screw rod nuts 511 on the gate 51 to move forward or backward, thereby driving the gate 51 to move forward or backward along the upper rail 52 and the lower rail 53, so as to realize closing or opening the gate 51. A locking mechanism capable of forcing the gate 51 to tightly adhere to the tower body 31 is arranged in the upper rail 52 and the lower rail 53, the locking mechanisms in the upper rail 52 and the lower rail 53 are the same, and the locking mechanism in the upper rail 52 is taken as an example, the locking mechanism comprises a locking cylinder 61 and a locking plate 6, the locking plate 6 is slidably clamped in the upper rail 52 and leaves a gap with the gate 51, the front end and the rear end of the locking plate 6 protrude out of the upper rail 52, one locking cylinder 61 is arranged on each of the front and rear outer side walls of the tower body 31, the piston rods of the two locking cylinders 61 are connected with the front end and the rear end of the locking plate 6 respectively, the locking cylinder 61 pulls the locking plate 6 to apply pressure to the gate 51, so that the gate 51 moves towards the tower body 31, at this time, the two screw rod nuts 511 move together in the long through hole 521 driven by the gate 51, the moving screw rod nuts 511 act on the screw rod 553 to drive the screw rod seats 552 and the sliding seats 55 on the two sides to move together in the corresponding sliding grooves and towards the tower body 31, so that the gate 51 tightly adheres to the tower body 31 through the sealing strips 56.

[0036] The cooling car 7 is movably arranged in the tower body 31 and can be lifted with the water level, the left and right sections of the cooling car 7 are movably clamped in the two guide grooves 311 of the tower body 31, a plurality of first universal ball bearings 71 are arranged on the front and back sides of the cooling car 7, the first universal ball bearings 71 abut against the inner walls of the corresponding guide grooves 311, the first universal ball bearings 71 play a guiding role in the lifting process of the cooling car 7, a roller 72 is rotatably arranged on the cooling car 7, the overwind holes 73 are arranged on the left and right side walls of the cooling car 7, the metal filter screens 731 are arranged in the overwind holes 73, the pore diameter of the metal filter screens 731 is smaller than the ball diameter of the balling, which can ensure that the wind can pass through the overwind holes 73 and the balling cannot fall out, the inverted conical feeding port 74 is arranged on the top wall of the cooling car 7, the guide hopper 75 is arranged in the cooling car 7, the small-diameter end of the guide hopper 75 is welded with the inverted conical feeding port 74 of the cooling car 7, the large-diameter end of the guide hopper 75 is welded with the side wall of the cooling car 7, the sealing cover 76 is connected with the inverted conical feeding port 74 through a conical thread, a quadrangular boss 761 is arranged at the center position of the sealing cover 76, the first screwing mechanism 8 capable of screwing or unscrewing the sealing cover 76 from the inverted conical feeding port 74 is arranged at the top of the tower body 31, the first screwing mechanism 8 comprises a cross sliding table 81, a rotary air cylinder 82 and parallel clamping jaws 83, the cross sliding table 81 is fixed at the top of the tower body 31, the rotary air cylinder 82 is arranged on the longitudinal sliding table of the cross sliding table 81, the parallel clamping jaws 83 are arranged on the rotating table of the rotary air cylinder 82, anti-skid pads 831 are arranged on the jaw walls of the parallel clamping jaws 83, and a cover 312 protecting the first screwing mechanism 8 is arranged at the top of the tower body 31. When screwing, the parallel clamping jaws 83 are opened, the cross sliding table 81 first drives the rotary air cylinder 82 and the parallel clamping jaws 83 to move above the quadrangular boss 761 of the sealing cover 76, then drives the rotary air cylinder 82 and the parallel clamping jaws 83 to move downward until the parallel clamping jaws 83 are horizontally aligned with the quadrangular boss 761, then the parallel clamping jaws 83 clamp the quadrangular boss 761, the rotary air cylinder 82 drives the parallel clamping jaws 83 to rotate, the parallel clamping jaws 83 drive the quadrangular boss 761 and the sealing cover 76 to rotate together, the cross sliding table 81 drives the rotary air cylinder 82 and the parallel clamping jaws 83 to slowly rise in the rotating process, the sealing cover 76 can be unscrewed, finally the cross sliding table 81 drives the sealing cover 76 to move away from the inverted conical feeding port 74, which is convenient for feeding, after the feeding is completed, the cross sliding table 81 drives the sealing cover 76 to move above the inverted conical feeding port 74, then drives the sealing cover 76 to slowly move downward into the inverted conical feeding port 74, at the same time, the rotary air cylinder 82 drives the sealing cover 76 to rotate in the reverse direction, the sealing cover 76 is screwed on the inverted conical feeding port 74, then the parallel clamping jaws 83 release the quadrangular boss 761 on the sealing cover 76, and the cross sliding table 81 drives the parallel clamping jaws 83 to rise.

[0037] Two inner guide rails 313 are arranged on the bottom wall of the tower body 31 in front and back directions, guide grooves are arranged on the rollers 72 of the cooling car 7, the rollers 72 are clamped on the inner guide rails 313 on the corresponding sides through the guide grooves, a connecting frame 9 and a trolley turnover mechanism capable of conveying and turning the cooling car 7 by 180 degrees are arranged on the right side of the exit gate mechanism 5, the second screw mechanism 91 is installed on the connecting frame 9, the second screw mechanism 91 is the same as the first screw mechanism 8 in structure, and the only difference is that the cross slide in the second screw mechanism 91 is fixed on the connecting frame 9, the trolley turnover mechanism is a mechanism commonly used in the metallurgical industry, and will not be described here again, and is not shown in the figure. Two outer guide rails 314 are arranged below the connecting frame 9 and the trolley turnover mechanism, and the two outer guide rails 314 are aligned with the two inner guide rails 313 one by one.

[0038] The application method of the longitudinal pellet roasting and cooling system comprises the following steps:

[0039] S1, the pellets enter the drying conveyor 1, and are dried in sequence through the air blowing drying section 11 and the air extraction drying section 12, the waste gas generated during drying is discharged from the flue 13, and the purpose of air blowing drying is to increase the temperature of the lower layer of pellets and remove the attached water on the lower layer of pellets, so as to prevent poor air permeability caused by excessive moisture of the lower layer of pellets during air extraction drying;

[0040] S2, the material distribution rod 253 in the material distribution valve 25 in the longitudinal roasting tower 2 abuts against the rotating guide plate 24, and the pressure sensor 261 in the gravity sensing assembly 26 abuts against the guide rod 263, the dried pellets enter the spiral guide plate 24 of the longitudinal roasting tower 2 through the discharge port of the drying conveyor 1, the pellets spiral downward on the spiral guide plate 24 and are blocked in the preheating section 22 by the material distribution valve 25, and the pellets on the spiral guide plate 24 in the preheating section 22 abut against the arc-shaped bearing plate 262, the arc-shaped bearing plate 262 abuts against the pressure sensor 261 through the guide rod 263 after being subjected to pressure, when the pressure received by the pressure sensor 261 reaches a set value, the material blocking valve 21 is closed, the pellets in the drying conveyor 1 no longer fall into the preheating section 22, and the preheating nozzles 221 in the preheating section 22 of the longitudinal roasting tower 2 preheat the pellets in the preheating section 22, since the pellets are uniformly distributed on the spiral guide plate 24, and each spiral section on the spiral guide plate 24 corresponds to at least one preheating nozzle 221, the preheating nozzles 221 can uniformly preheat the pellets in the preheating section 22, after preheating, the material distribution valve 25 is opened, the pellets in the preheating section 22 enter the roasting section 23 for roasting, the material distribution valve 25 is closed again, the material blocking valve 21 is opened, and the new pellets in the drying conveyor 1 enter the preheating section 22 for preheating;

[0041] S3, the cooling car 7 is sent into the longitudinal sectional cooling tower 3, the exit gate mechanism 5 is closed, a large amount of water is injected into the longitudinal sectional cooling tower 3 through the inlet and outlet water valve 361, the cooling car 7 is lifted along with the rising of the water level, in the lifting process of the cooling car 7, when the cooling car 7 is lifted into the parking section 32, the parking cylinder 322 in the parking section 32 drives the push plate 323 to abut against the left and right sides of the cooling car 7 to position the cooling car 7, then the sealing cover 76 on the cooling car 7 is unscrewed open through the first screwing mechanism 8, the push plate 323 driven by the parking cylinder 322 is reset, the cooling car 7 is released, then water injection is continued, so that the feeding pipe 321 on the parking section 32 can extend into the inverted conical feeding port 74 of the cooling car 7; after the pellets in the roasting section 23 are completed roasting, the discharge valve 271 and a distribution valve 411 are opened, the high-temperature pellets in the roasting section 23 will enter into the corresponding cooling car 7 in sequence through the discharge main pipe 27, the distribution ball pipe 4, the branch pipe 41 and the feeding pipe 321, then part of the water in the longitudinal sectional cooling tower 3 is discharged, so that the cooling car 7 is lowered and separated from the feeding pipe 321, the push plate 323 driven by the parking cylinder 322 repositions the cooling car 7, then the sealing cover 76 is screwed on the inverted conical feeding port 74 by the first screwing mechanism 8, after the screwing action of the sealing cover 76 is completed, the push plate 323 driven by the parking cylinder 322 is reset;

[0042] S4, discharging part of water from the water inlet and outlet seal 361, so that the cooling car 7 is lowered into the first cooling section 33, at this time, the two air holes 73 on the cooling car 7 are respectively aligned with the air outlet valve 38 and the air inlet valve 37 in the first cooling section 33, the air outlet valve 38 and the air inlet valve 37 in the first cooling section 33 are opened, and the cooling fan 371 on the air inlet valve 37 is started, the cooling fan 371 on the air inlet valve 37 blows cold air into the cooling car 7 through the air inlet valve 37 and the air hole 73 on the cooling car 7 to cool the high-temperature pellets in the cooling car 7, the hot air formed after the cold air exchanges heat with the high-temperature pellets enters the first regenerative branch pipe 381 through the other air hole 73 in the cooling car 7 and the air outlet valve 38 in the first cooling section 33, and then enters the baking section 23 through the first regenerative channel 28 to increase the temperature in the baking section 23 and change the flame shape of the baking nozzle 231, thereby improving the combustion of the pulverized coal and improving the clinker quality, when the temperature sensor on the first regenerative branch pipe 381 senses that the temperature of the hot air is lower than 1000℃, it indicates that the temperature of the high-temperature pellets has been reduced to below 1000℃, the air outlet valve 38 and the air inlet valve 37 on the first cooling section 33 are closed, and the cooling fan 371 on the air inlet valve 37 stops working; continue to discharge water, so that the cooling car 7 is lowered into the second cooling section 34, the air outlet valve 38 and the air inlet valve 37 in the second cooling section 34 are opened, and the cooling fan 371 on the air inlet valve 37 is started, to cool the high-temperature pellets in the cooling car 7, the hot air generated in the second cooling section 34 enters the second regenerative branch pipe 382, and then enters the preheating section 22 through the second regenerative channel 29 to assist the preheating nozzle 221 to improve the preheating effect on the pellets, when the temperature sensor on the second regenerative branch pipe 382 senses that the temperature of the hot air is lower than 600℃, it indicates that the temperature of the high-temperature pellets in the cooling car 7 has been reduced to below 600℃, the air outlet valve 38 and the air inlet valve 37 on the second cooling section 34 are closed, and the cooling fan 371 on the air inlet valve 37 stops working; continue to discharge water, so that the cooling car 7 is lowered into the third cooling section 35, the air outlet valve 38 and the air inlet valve 37 in the third cooling section 35 are opened, and the cooling fan 371 on the air inlet valve 37 is started, to cool the high-temperature pellets in the cooling car 7, the hot air generated in the third cooling section 35 enters the third regenerative branch pipe 383, and then enters the drying conveyor 1 through the third regenerative channel 14 to play an auxiliary drying role, when the temperature sensor on the third regenerative branch pipe 383 senses that the temperature of the hot air is lower than 150℃, it indicates that the temperature of the high-temperature pellets in the cooling car 7 has been reduced to below 150℃, the air outlet valve 38 and the air inlet valve 37 on the third cooling section 35 are closed, and the cooling fan 371 on the air inlet valve 37 stops working;

[0043] S5, the water is completely discharged, the cooling car 7 is entered into the exit section 36, and falls to the bottom of the tower body 31, the roller 72 on the cooling car 7 is clamped on the inner guide rail 313, then the exit gate mechanism 5 is opened, the trolley turnover mechanism is used to first remove the cooling car 7 from the tower body 31, the roller 72 on the cooling car 7 is rolled from the inner guide rail 313 to the outer guide rail 314, the trolley turnover mechanism is used to convey the cooling car 7 below the second screwing mechanism 91, the sealing cover 76 on the cooling car 7 is screwed open through the second screwing mechanism 91, then the trolley turnover mechanism continues to drive the cooling car 7 to move to the unloading station, the cooling car 7 is turned over by 180°, so that the pellets in the cooling car 7 fall into the unloading station, since the guide hopper 75 is arranged in the cooling car 7, when the cooling car 7 is turned over by 180°, the pellets in the cooling car 7 can all fall out, then the cooling car 7 is reversed by 180°, the roller 72 on the cooling car 7 is clamped on the outer guide rail 314 again, and is conveyed back to the second screwing mechanism 91 to screw the sealing cover 76, then is conveyed back to the tower body 31, the exit gate mechanism 5 is closed again, a large amount of water is injected again, so that the empty cooling car 7 floats to the parking section 32;

[0044] S6, when the longitudinal sectional cooling tower 3 is in the sectional cooling work, the distribution valve 411 on the branch pipe 41 corresponding to the longitudinal sectional cooling tower 3 is closed, and the distribution valve 411 on the branch pipe 41 corresponding to any other longitudinal sectional cooling tower 3 is opened, so that the high-temperature pellets in the roasting section 23 can enter the cooling car 7 of the other longitudinal sectional cooling tower 3 to be sectional cooled.

[0045] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit it, although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that: the specific embodiments of the present application can be modified or replaced by the same, without departing from the spirit and scope of the present application, any modification or equivalent replacement, which should be covered in the protection scope of the claims of the present application.

Claims

1. A grate-kiln cooler system, characterized in that: It comprises a drying conveyor, a longitudinal baking tower and several longitudinal sectional cooling towers, wherein the drying conveyor is provided with a blast drying section, an exhaust drying section, a flue and a discharge port, the longitudinal baking tower is connected with the discharge port of the drying conveyor, a material blocking valve is arranged between the longitudinal baking tower and the drying conveyor, a preheating section and a baking section are arranged in the longitudinal baking tower from top to bottom, preheating nozzles are arranged in the preheating section, baking nozzles are arranged in the baking section, a spiral material guide plate is arranged in the longitudinal baking tower and penetrates the preheating section and the baking section, a material distribution valve and a gravity sensing assembly capable of abutting against the spiral material guide plate are arranged between the preheating section and the baking section, a discharge main pipe is connected with the baking section of the longitudinal baking tower, a discharge valve and a distribution ball pipe are arranged on the discharge main pipe, several branch pipes are connected with the distribution ball pipe, a distribution valve is arranged in each branch pipe, and each branch pipe is connected with a longitudinal sectional cooling tower in a downward and oblique manner. The outflow valve in the first cooling section is connected with the first heat recovery channel through the first heat recovery branch pipe, the first heat recovery channel is connected with the baking section, the outflow valve in the second cooling section is connected with the second heat recovery channel through the second heat recovery branch pipe, the second heat recovery channel is connected with the preheating section, the outflow valve in the third cooling section is connected with the third heat recovery channel through the third heat recovery branch pipe, the third heat recovery channel is connected with the drying conveyor, and a gas check valve and a temperature sensor are arranged on each heat recovery branch pipe.

2. The grate-kiln-cooler system according to claim 1, characterized in that: ​ 3. The grate-kiln-cooler system according to claim 1, characterized in that: The valve plate of the blocking valve is uniformly provided with a plurality of air permeable holes with a diameter smaller than the ball diameter of the ball; the material distributing valve comprises a cylinder seat, a distributing cylinder and a distributing rod, the cylinder seat is fixed on the outer sidewall of the longitudinal roasting tower, a plurality of distributing cylinders are fixed on the cylinder seat, a connecting plate is arranged between the piston rods of the distributing cylinders, a plurality of distributing rods are uniformly arranged on the connecting plate, the distributing rods are slidably arranged on the sidewall of the longitudinal roasting tower, the gap between every two adjacent distributing rods is smaller than the ball diameter of the ball; the gravity sensing assembly comprises a pressure sensor and an arc-shaped bearing plate, the pressure sensor is fixed on the connecting plate, a plurality of guide rods are slidably arranged on the sidewall of the longitudinal roasting tower, the guide rods are horizontally aligned with the pressure sensor, a heat insulation pad is arranged on the outer end of the guide rod extending out of the longitudinal roasting tower, and the arc-shaped bearing plate is connected with the inner end of the guide rod in the longitudinal roasting tower.

4. The grate-kiln-cooler system according to claim 1, characterized in that: A quadrilateral boss is arranged at the center of the sealing cover, the first screwing mechanism and the second screwing mechanism are the same in structure, and the first screwing mechanism is taken as an example, the first screwing mechanism comprises a cross slide, a rotary cylinder and parallel clamping jaws, the cross slide is fixed on the top of the tower body, the rotary cylinder is arranged on the longitudinal slide of the cross slide, the parallel clamping jaws are arranged on the rotary table of the rotary cylinder, a non-slip pad is arranged on the jaw wall of the parallel clamping jaws, and a cover shell for protecting the first screwing mechanism is arranged on the top of the tower body.

5. The grate-kiln-cooler system according to claim 1, characterized in that: A guide groove is arranged on each of the left and right inner sidewalls of the tower body, the left and right ends of the cooling carriage are movably clamped in the two guide grooves, a plurality of first universal ball bearings are arranged on the front and rear sides of the cooling carriage, and the first universal ball bearings abut against the sidewall of the corresponding guide groove.

6. The grate-kiln-cooler system according to claim 1, characterized in that: Two parking air cylinders are arranged on the left and right sidewalls of the parking section, the piston rods of the parking air cylinders extend into the tower body, and a push plate is arranged on the piston rod of the parking air cylinder.

7. The longitudinal pellet indurating and cooling system as claimed in claim 1, wherein: A material guide hopper is arranged in the cooling carriage, the small-diameter end of the material guide hopper is welded with the inverted conical feeding port of the cooling carriage, and the large-diameter end of the material guide hopper is welded with the sidewall of the cooling carriage.

8. The grate-kiln-cooler system according to claim 1, characterized in that: The outlet gate mechanism comprises a gate, an upper track and a lower track, the width of the upper track and the lower track is greater than the thickness of the gate, a plurality of second universal ball bearings are arranged at intervals on the bottom of the gate, the gate is arranged in the lower track through the second universal ball bearings and a gap is left between the gate and the lower track, the top of the gate is movably arranged in the upper track and a gap is left between the gate and the upper track, a long through hole is formed in the upper track, a sliding groove is arranged on the upper track on the front and rear sides of the long through hole, a sliding seat is slidably arranged in the two sliding grooves, a servo motor and a screw seat are arranged on one sliding seat, a screw seat is arranged on the other sliding seat, a screw is rotatably arranged between the two screw seats, the servo motor is connected with the screw, two screw nuts are arranged on the front side of the top of the gate, the two screw nuts are upwardly threaded through the long through hole and are threadedly connected with the screw, the screw nuts can slide leftward and rightward in the long through hole, sealing strips are arranged around the sidewall of the tower body close to the gate, and locking mechanisms are arranged on the upper track and the lower track and can force the gate to tightly abut against the sidewall of the tower body.

9. The grate-kiln-cooler system according to claim 8, characterized in that: The locking mechanism on the upper track and the lower track is the same, and the locking mechanism on the upper track is taken as an example, which comprises a locking cylinder and a locking plate, the locking plate is slidably clamped in the upper track and has a gap with the gate, and the front and rear ends of the locking plate extend out of the upper track, and one locking cylinder is arranged on the front and rear outer side walls of the tower body respectively, and the piston rods of the two locking cylinders are connected with the front and rear ends of the locking plate respectively.

10. A method of using the longitudinal pellet induration and cooling system according to any one of claims 1 to 9, characterized in that: The steps are as follows: S1, the pellets enter the drying conveyor, and are dried in turn through the air blowing drying section and the air extraction drying section, and the waste gas generated by drying is discharged from the flue; S2, the distributing valve in the longitudinal roasting tower abuts against the rotating material guide plate, and the gravity sensing assembly starts to work, the dried pellets enter the spiral material guide plate of the longitudinal roasting tower through the discharge port of the drying conveyor, and are blocked in the preheating section by the distributing valve, and the pellets on the spiral material guide plate in the preheating section abut against the gravity sensing assembly, when the pressure received by the gravity sensing assembly reaches the set value, the blocking valve is closed, the pellets in the drying conveyor no longer fall into the preheating section, the preheating section of the longitudinal roasting tower preheats the pellets in the preheating section, after preheating is completed, the distributing valve is opened, the pellets in the preheating section enter the roasting section for roasting, the distributing valve is closed again, and the blocking valve is opened, so that the pellets in the drying conveyor enter the preheating section for preheating; S3, the cooling car is sent into the longitudinal sectional cooling tower, a large amount of water is injected into the longitudinal sectional cooling tower, and the cooling car rises with the rising of the water level, when the cooling car rises to the stop car section, the sealing cover on the cooling car is unscrewed and opened through the first screwing mechanism, then water injection is continued, the feeding pipe on the stop car section extends into the inverted conical feeding port of the cooling car; after the pellets in the roasting section complete roasting, the discharge valve and a distribution valve are opened, the high-temperature pellets in the roasting section will enter the corresponding cooling car in turn through the discharge main pipe, the distribution ball pipe, the branch pipe and the feeding pipe, then part of the water is discharged, the cooling car is lowered and separated from the feeding pipe, and then the sealing cover is screwed on the inverted conical feeding port by the first screwing mechanism; S4, drain part of the water, so that the cooling car is lowered into the first cooling section, open the air outlet valve and air inlet valve in the first cooling section, and start the cooling fan on the air inlet valve, the cooling fan blowing cold air through the air inlet valve and the cooling car over the air hole into the cooling car to cool the high temperature pellets in the cooling car, the hot air formed after the heat exchange between the cold air and the high temperature pellets is discharged outward through another air hole in the cooling car and the air outlet valve on the first cooling section, when the temperature of the high temperature pellets is reduced to less than 1000℃, the air outlet valve and the air inlet valve on the first cooling section are closed, and the cooling fan stops working; continue to drain water, so that the cooling car is lowered into the second cooling section, open the air outlet valve and air inlet valve in the second cooling section, and start the cooling fan on the air inlet valve, so that the high temperature pellets in the cooling car are cooled, when the temperature of the high temperature pellets is reduced to less than 600℃, the air outlet valve and the air inlet valve on the second cooling section are closed, and the cooling fan stops working; continue to drain water, so that the cooling car is lowered into the third cooling section, open the air outlet valve and air inlet valve in the third cooling section, and start the cooling fan on the air inlet valve, so that the high temperature pellets in the cooling car are cooled, when the temperature of the high temperature pellets is reduced to less than 150℃, the air outlet valve and the air inlet valve on the third cooling section are closed, and the cooling fan stops working; S5, drain the water completely, so that the cooling car enters the exit section and falls to the bottom of the tower body, then open the exit gate mechanism, use the trolley turnover mechanism to first move the cooling car out of the tower body, then open the sealing cover on the cooling car through the second screwing mechanism, then the trolley turnover mechanism continues to drive the cooling car to move to the unloading station, then the cooling car is turned over by 180°, so that the pellets in the cooling car fall into the unloading station, then it is turned over by 180° again, and then it is transported back to the second screwing mechanism to screw the sealing cover, then it is transported back to the tower body, the exit gate mechanism is closed, and a large amount of water is injected again, so that the empty cooling car floats to the parking section; S6, when a certain longitudinal sectional cooling tower is cooling, close the distribution valve on the branch corresponding to the longitudinal sectional cooling tower, open the distribution valve on the branch corresponding to any other longitudinal sectional cooling tower, so that the high temperature pellets in the roasting section can enter the cooling car of the other longitudinal sectional cooling tower for sectional cooling.

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