A dust ash pre-wetting mixing device

Abstract

The application discloses a dust ash pre-wetting mixing device, which comprises a blanking shell, first and second metering belt scales are installed on the top of the blanking shell, a dust ash batching bin is fixed above the first metering belt scale by bolts, a returned ore batching bin is fixed above the second metering belt scale by bolts, a dustproof cover plate is hinged to the top of the blanking shell by hinges, and a stirring cage shell is fixedly connected to the bottom of the blanking shell by flanges. The application solves the problem of insufficient wetting in the traditional process by means of segmented stirring and precise water spraying design. The coarse segment stirring shaft drives large lead screw spiral blades to rapidly disperse the material, the first atomizing nozzle group synchronously sprays water, the material is preliminarily wetted, the fine segment stirring shaft drives small lead screw spiral blades to finely stir, the second atomizing nozzle group supplements water, and the inner arc guide plate guides the material to form a circulating flow, so that the water is ensured to penetrate into the material.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, and in particular to a dust removal ash pre-wetting and mixing device. Background Technology

[0002] In the metallurgical sintering production process, dust collector ash and recycled ore are important recycled materials and need to be added to the mixture for pelletizing. The pelletizing effect of the mixture directly determines the air permeability of the trolley, which in turn affects the energy consumption of the main exhaust fan, solid fuel consumption, and the yield and quality of sinter. In traditional processes, the treatment of dust collector ash and recycled ore involves batching, conveying, and mixing. Pre-wetting is a key step to ensure pelletizing effect—if the material is not sufficiently wetted, the adhesion of powdered iron, fuel, and flux will be poor during pelletizing, resulting in low-strength pellets with uneven particle size distribution, ultimately reducing sintering efficiency. Currently, the industry mostly relies on adding water to the mixing belt after the batching bin or adding steam (hot water) for stirring during the first mixing stage for pre-wetting of dust collector ash and recycled ore. However, with the increase in sintering capacity and the tightening of environmental protection requirements, the existing treatment methods are no longer sufficient to meet the needs of high-efficiency production.

[0003] In practical applications, the traditional prewetting process has significant shortcomings: Firstly, the wetting uniformity is poor. Adding water to the mixing belt can only wet the surface of the mixture, while dust and return ore are usually not distributed on the surface, which prevents water from penetrating into the interior of the material. Even if water is added to the first batch, the mixing time is short and the material flow rate is fast, so the water and the material can only come into contact briefly and cannot react fully. Some materials are still in a state of insufficient moisture, which can easily lead to the "dry core" phenomenon during subsequent pelletizing.

[0004] Secondly, the equipment has low operational stability. Traditional equipment lacks targeted anti-clogging and wear-resistant designs. Dust collector ash, due to its fine particle size and strong adsorption, easily adheres and clumps on the inner wall of the feed pipe and mixing chamber, causing material conveying to become stuck. The long-term impact of hot return ore on the conveying components easily causes wear on the chute and blades, requiring frequent shutdowns for maintenance and affecting production continuity.

[0005] Third, the precision of parameter control is insufficient. Traditional processes lack real-time monitoring and closed-loop control mechanisms. The amount of water added is set only by manual experience and cannot be dynamically adjusted according to the real-time flow and temperature of dust and return ore. When the temperature of hot return ore is too high, the fixed amount of water will result in insufficient wetting due to rapid evaporation. When the material flow fluctuates, it is easy to cause excessive wet caking or insufficient wet dust, making it difficult to stably control the overall moisture content of the mixture. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a dust removal ash pre-wetting and mixing device.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A dust removal ash pre-wetting and mixing device includes a discharge shell. A first metering belt scale and a second metering belt scale are respectively installed on the top two sides of the discharge shell. A dust removal ash batching bin is fixed above the first metering belt scale by bolts, and a return ore batching bin is fixed above the second metering belt scale by bolts. A dust cover plate is hinged to the top of the discharge shell, and a stirring cage shell is fixed to the bottom of the discharge shell by a flange. The inner wall of the stirring cage shell is welded with three equally spaced inner arc-shaped guide plates, and the inner wall of each inner arc-shaped guide plate is bonded and fixed with a smooth ceramic liner. A coarse section stirring shaft is rotatably installed at the axis of the inner wall of the stirring cage shell, and a fine section stirring shaft is fixed to one end of the coarse section stirring shaft by bolts. A large lead spiral blade is welded to the outer wall of the middle section of the coarse section stirring shaft, and a small lead spiral blade is welded to the outer wall of the middle section of the fine section stirring shaft. One end of the coarse section stirring shaft is connected to a variable frequency drive motor through a coupling. A symmetrically distributed material level sensor is inserted into one side of the inner wall of the stirring cage shell, and a symmetrically distributed temperature sensor is installed on the bottom inner wall of the stirring cage shell. A moisture analyzer is fixed to the end of the agitator shell via a bracket. Two symmetrically distributed water spray channels are opened on the top outer wall of the agitator shell. An arc-shaped cover plate is fixed to the inner wall of the water spray channel with screws. A first atomizing nozzle group and a second atomizing nozzle group are respectively installed on the arc-shaped cover plate. A connecting pipe is connected to the inner wall of one end of the first atomizing nozzle group and the second atomizing nozzle group. An electromagnetic flow meter, an electric variable frequency regulating valve, and a pressure sensor are sequentially installed in the middle of the connecting pipe. The ends of the two connecting pipes are connected to the same tee pipe. The other end of the tee pipe is connected to the hot water storage tank via a variable frequency hot water delivery pump. Water level sensors are installed at equal intervals on the inner wall of the hot water storage tank. A PLC controller is installed on one side of the outer wall of the hot water storage tank.

[0008] Preferably, a first electric slide gate valve is installed at the bottom outlet of the dust removal ash batching silo, and a second electric slide gate valve is installed at the bottom outlet of the return ore batching silo.

[0009] Preferably, the included angle between the centers of the three inner arc-shaped guide plates is 120°, and a retaining strip is welded to one side of the outer wall of the inner arc-shaped guide plate, and a retaining groove is opened on the other side of the outer wall of the inner arc-shaped guide plate, and the retaining strip and the retaining groove are matched in size to form a tight fit.

[0010] Preferably, the outer wall of the stirring cage shell is bonded and fixed with a rock wool insulation layer, and a maintenance slot is opened on one side of the outer wall of the stirring cage shell. An maintenance door is fixed to the inner wall of the maintenance slot by bolts, and a sealing gasket is provided on the inner side of the maintenance door. The sealing gasket is made of oil-resistant rubber.

[0011] Preferably, the end of the agitator shell away from the variable frequency drive motor is fixed with a discharge chute by bolts, and a high frequency vibrator is fixed with bolts on one side of the bottom of the discharge chute. The inner wall of the discharge chute is bonded with a silicon nitride ceramic plate, and the inclination angle of the discharge chute is 75°.

[0012] Preferably, the PLC controller is a Siemens S7-1200, and the PLC controller is electrically connected to the first metering belt scale, the second metering belt scale, the first electric slide gate valve, the second electric slide gate valve, the variable frequency drive motor, the material level sensor, the temperature sensor, the online moisture analyzer, the electromagnetic flow meter, the electric variable frequency regulating valve, the pressure sensor, and the three water level sensors.

[0013] Preferably, the hot water storage tank is provided with a water inlet on the top, and an electric water inlet valve is installed at the water inlet. The electric water inlet valve is electrically connected to the PLC controller, and when the water level sensor detects that the water level in the hot water storage tank is less than 0.5m, the PLC controller controls the electric water inlet valve to open and replenish water.

[0014] Preferably, the inner diameter of the smooth ceramic liner is adapted to the outer diameter of the large-lead spiral blade, and the inner diameter of the smooth ceramic liner is adapted to the outer diameter of the small-lead spiral blade.

[0015] The beneficial effects of this invention are as follows: 1. Improved wetting uniformity and guaranteed pelletizing quality – Through segmented mixing and precise water spraying design, the problem of insufficient wetting in traditional processes is solved. The coarse-section mixing shaft drives the large-lead spiral blades to quickly disperse the material, and the first atomizing nozzle group sprays water simultaneously to achieve initial wetting of the material. The fine-section mixing shaft drives the small-lead spiral blades for fine mixing, and the second atomizing nozzle group replenishes the water volume. In conjunction with the inner arc-shaped guide plate, the material is guided to form a circulating flow, ensuring that the water penetrates into the interior of the material. At the same time, the online moisture analyzer detects the moisture content of the material in real time, and the PLC controller adjusts the opening of the electric frequency conversion regulating valve according to the data to avoid under-wetting or over-wetting. Ultimately, the uniformity of material wetting is improved, providing high-quality raw materials for subsequent pelletizing.

[0016] 2. Enhance equipment stability and reduce maintenance costs – Targeted optimization of anti-sticking and wear-resistant structures solves the problems of easy adhesion and wear in traditional equipment. The inner wall of the inner arc-shaped guide plate is bonded with a smooth ceramic liner, and the inner wall of the unloading chute is bonded with a silicon nitride ceramic plate, which greatly reduces the probability of material adhesion. The high-frequency vibrator vibrates the unloading chute at regular intervals to prevent material accumulation and blockage. In addition, the installation of maintenance doors facilitates quick cleaning of internal adhered materials, reducing the frequency of equipment shutdown for maintenance and ensuring continuous production. 3. Achieve precise automated control and improve production efficiency—Through full-process monitoring and closed-loop regulation, the problem of crude control of traditional process parameters is solved. The first and second metering belt scales provide real-time feedback on material flow. The PLC controller adjusts the opening of the first and second electric slide gate valves to stabilize material supply. The temperature sensor detects the temperature of the hot return ore and dynamically adjusts the water spray volume according to temperature changes to avoid insufficient wetting caused by water evaporation. The material level sensor monitors the amount of material in the mixing chamber and links the variable frequency drive motor to adjust the speed to prevent overload or idling. Attached Figure Description

[0017] Figure 1 This is a front view of the overall structure of a dust removal ash pre-wetting and mixing device proposed in this invention; Figure 2 This is a side view of the overall structure of a dust removal ash pre-wetting and mixing device proposed in this invention; Figure 3 This is a top view of the overall three-dimensional structure of a dust removal ash pre-wetting and mixing device proposed in this invention; Figure 4 This is a partial structural breakdown diagram of a dust removal ash pre-wetting and mixing device proposed in this invention; Figure 5 This is a schematic diagram of the disassembled structure of the agitator shell of the dust removal ash pre-wetting and mixing device proposed in this invention; Figure 6 This is a schematic diagram of the internal structure of the stirring cage shell of a dust removal ash pre-wetting and mixing device proposed in this invention.

[0018] In the diagram: 1. Material discharge shell; 2. First metering belt scale; 3. Second metering belt scale; 4. Dust removal ash batching bin; 5. Return ore batching bin; 6. First electric slide gate valve; 7. Second electric slide gate valve; 8. Dustproof cover; 9. Agitator shell; 10. Inner arc-shaped guide plate; 11. Smooth ceramic liner; 12. Coarse section agitator shaft; 13. Fine section agitator shaft; 14. Large lead spiral blade; 15. Small lead spiral blade; 16. Variable frequency drive motor; 17. Rock wool insulation layer; 18. Material level sensor; 19. 20. Temperature sensor; 21. Unloading chute; 22. High-frequency vibrator; 23. Silicon nitride ceramic plate; 24. Online moisture analyzer; 25. Spray tank; 26. Arc-shaped cover plate; 27. First atomizing nozzle group; 28. Second atomizing nozzle group; 29. ​​Connecting pipe; 30. Electromagnetic flow meter; 31. Electric variable frequency regulating valve; 32. Pressure sensor; 33. T-pipe; 34. Variable frequency hot water transfer pump; 35. Hot water storage tank; 36. Water level sensor; 37. PLC controller; 38. Inspection door. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Example 1, referring to Figure 1-6 A dust removal ash pre-wetting and mixing device includes a discharge shell 1. A first metering belt scale 2 and a second metering belt scale 3 are respectively installed on the top two sides of the discharge shell 1. A dust removal ash batching bin 4 is fixed above the first metering belt scale 2 by bolts, and a return ore batching bin 5 is fixed above the second metering belt scale 3 by bolts. A dustproof cover plate 8 is hinged to the top of the discharge shell 1, and a stirring cage shell 9 is fixedly connected to the bottom of the discharge shell 1 by a flange. The inner wall of the stirring cage shell 9 is welded with three equally spaced inner arc-shaped guide plates 10, and the inner wall of each inner arc-shaped guide plate 10 is bonded and fixed with a smooth ceramic liner plate 11. A coarse section stirring shaft 12 is rotatably arranged at the axis of the inner wall of the stirring cage shell 9, and a fine section stirring shaft 13 is fixed to one end of the coarse section stirring shaft 12 by bolts. A large lead spiral blade 14 is welded to the outer wall of the middle part of the coarse section stirring shaft 12, and a small lead spiral blade 15 is welded to the outer wall of the middle part of the fine section stirring shaft 13. One end of the coarse section stirring shaft 12 is connected to a variable frequency drive motor 16 through a coupling. A symmetrically distributed material level sensor 18 is inserted into the inner wall of one side of the stirring cage shell 9, and a symmetrically distributed temperature sensor 19 is installed on the inner wall of the bottom of the stirring cage shell 9. The end of the stirring cage shell 9 is fixed with a moisture online analyzer 23 by a bracket, and the top outer wall of the stirring cage shell 9 has two symmetrically distributed water spray channels 24. The inner wall of the water spray channel 24 is fixed with an arc-shaped cover plate 25 by screws, and the arc-shaped cover plate 25 is respectively installed with a first atomizing nozzle group 26 and a second atomizing nozzle group 27. The inner wall of one end of the first atomizing nozzle group 26 and the second atomizing nozzle group 27 is connected to a connecting pipe 28, and an electromagnetic flow meter 29, an electric variable frequency regulating valve 30 and a pressure sensor 31 are sequentially installed in the middle of the connecting pipe 28. The ends of the two connecting pipes 28 are connected to the same three-way pipe 32, and the other end of the three-way pipe 32 is connected to the hot water storage tank 34 through a variable frequency hot water delivery pump 33. The inner wall of the hot water storage tank 34 is installed with water level sensors 35 distributed at equal intervals, and a PLC controller 36 is installed on one side of the outer wall of the hot water storage tank 34. A first electric slide gate valve 6 is installed at the bottom outlet of the dust removal ash batching silo 4, and a second electric slide gate valve 7 is installed at the bottom outlet of the return ore batching silo 5. The included angle between the centers of the three inner arc-shaped guide plates 10 is 120°, and a retaining strip is welded to one side of the outer wall of the inner arc-shaped guide plate 10. A retaining groove is opened on the other side of the outer wall of the inner arc-shaped guide plate 10, and the retaining strip and the retaining groove are matched to form a fastening fit. The outer wall of the stirring cage shell 9 is bonded and fixed with a rock wool insulation layer 17, and a maintenance slot is opened on one side of the outer wall of the stirring cage shell 9. The inner wall of the maintenance slot is fixed with a maintenance door 37 by bolts, and a sealing gasket is provided on the inner side of the maintenance door 37. The sealing gasket is made of oil-resistant rubber. The end of the auger shell 9 away from the variable frequency drive motor 16 is fixed with a discharge chute 20 by bolts, and a high frequency vibrator 21 is fixed with bolts on one side of the bottom of the discharge chute 20. A silicon nitride ceramic plate 22 is bonded to the inner wall of the discharge chute 20, and the inclination angle of the discharge chute 20 is 75°.

[0021] The PLC controller 36 adopts Siemens S7-1200, and the PLC controller 36 is electrically connected to the first metering belt scale 2, the second metering belt scale 3, the first electric slide gate valve 6, the second electric slide gate valve 7, the variable frequency drive motor 16, the material level sensor 18, the temperature sensor 19, the online moisture analyzer 23, the electromagnetic flow meter 29, the electric variable frequency regulating valve 30, the pressure sensor 31, and the three water level sensor 35. The top of the hot water storage tank 34 is provided with a water inlet, and an electric water inlet valve is installed at the water inlet. The electric water inlet valve is electrically connected to the PLC controller 36. When the water level sensor 35 detects that the water level in the hot water storage tank 34 is less than 0.5m, the PLC controller 36 controls the electric water inlet valve to open and replenish water. The inner diameter of the smooth ceramic liner 11 is adapted to the outer diameter of the large-lead spiral blade 14, and the inner diameter of the smooth ceramic liner 11 is adapted to the outer diameter of the small-lead spiral blade 15.

[0022] Example 2, refer to Figure 1-6A dust collector pre-wetting and mixing device includes a discharge shell 1, which serves as the core component for material transfer. A first metering belt scale 2 and a second metering belt scale 3 are respectively installed on the top two sides of the discharge shell 1 to achieve separate metering of dust collector ash and return ore. A dust collector ash batching bin 4 is bolted directly above the first metering belt scale 2 for storing dust collector ash to be processed. A return ore batching bin 5 is bolted directly above the second metering belt scale 3 for storing hot return ore. To control the material discharge rate, a first electric slide gate valve 6 is installed at the bottom outlet of the dust collector ash batching bin 4, and a second electric slide gate valve 7 is installed at the bottom outlet of the return ore batching bin 5. The valve opening can be adjusted to precisely match subsequent mixing requirements. A dustproof cover plate 8 is hinged to the top of the discharge shell 1 to prevent dust generation during material conveying and to facilitate inspection of the internal material discharge. A stirring cage shell 9 is fixedly connected to the bottom of the discharge shell 1 via a flange to ensure stable material entry into the core mixing area.

[0023] The agitator shell 9 is the key carrier for achieving graded wetting and mixing. Its outer wall is bonded with a rock wool insulation layer 17, which reduces heat loss during the mixing process and provides a suitable temperature environment for the full reaction of moisture and materials. One side of the agitator shell 9 has a maintenance slot, and a maintenance door 37 is bolted to the inner wall of the slot. The inner side of the maintenance door 37 is fitted with an oil-resistant rubber sealing gasket, facilitating daily cleaning and component maintenance while preventing dust leakage. Three equidistant inner arc-shaped guide plates 10 are welded to the inner wall of the agitator shell 9, with the included angle between the centers of the three inner arc-shaped guide plates 10 being 120°. It can guide the material to form a "spiral circulation flow" in the mixing chamber, avoiding local mixing dead corners. The outer wall of the inner arc-shaped guide plate 10 is welded with a retaining strip on one side and has a retaining groove on the outer wall of the other side. The retaining strip and the retaining groove are matched to form a tight fit, ensuring that the guide plate does not loosen under long-term mixing impact. The inner wall of the inner arc-shaped guide plate 10 is bonded and fixed with a smooth ceramic liner plate 11. The inner wall diameter of the smooth ceramic liner plate 11 is matched with the outer wall size of the large-lead spiral blade 14 and the small-lead spiral blade 15, which not only reduces the friction coefficient between the material and the guide plate and prevents adhesion, but also improves the wear resistance.

[0024] A coarse-section stirring shaft 12 is rotatably mounted at the axial center of the inner wall of the stirring cage shell 9. One end of the coarse-section stirring shaft 12 is fixed to a fine-section stirring shaft 13 by bolts, forming a segmented stirring structure. Large-lead spiral blades 14 are welded to the outer wall of the middle section of the coarse-section stirring shaft 12. The large-lead design can quickly disperse the material that has just entered the stirring cage and achieve preliminary mixing. Small-lead spiral blades 15 are welded to the outer wall of the middle section of the fine-section stirring shaft 13. The small-lead design can perform "kneading" fine stirring of the material to ensure uniform water penetration. One end of the coarse-section stirring shaft 12 is connected to a variable frequency drive motor 16 through a coupling. The variable frequency drive motor 16 can dynamically adjust the speed according to the material load to achieve flexible control of the stirring intensity. Symmetrically distributed material level sensors 18 are inserted into the inner wall of one side of the stirring cage shell 9 to monitor the material filling rate in the stirring chamber in real time and avoid material accumulation. Symmetrically distributed temperature sensors 19 are installed on the inner wall of the bottom to detect the real-time temperature of the hot return ore and provide data support for water addition adjustment.

[0025] The end of the agitator shell 9 furthest from the variable frequency drive motor 16 is fixed to the unloading chute 20 by bolts. The unloading chute 20 is inclined at an angle of 75° to ensure that the wetted material can slide out smoothly. A high-frequency vibrator 21 is fixed to one side of the bottom of the chute by bolts. It can vibrate at regular intervals to break up any materials that may stick together and prevent material blockage. A silicon nitride ceramic plate 22 is bonded to the inner wall of the chute. Silicon nitride ceramic has high hardness and strong wear resistance, which can extend the service life of the chute. A moisture online analyzer 23 is fixed to the end of the agitator shell 9 by a bracket. It is used to detect the moisture content of the material before unloading in real time and feed the feedback to the control system to adjust the water addition. Two symmetrically distributed water spray channels 24 are opened on the top outer wall of the agitator shell 9. An arc-shaped cover plate 25 is fixed to the inner wall of the water spray channel 24 by screws. A first atomizing nozzle group 26 and a second atomizing nozzle group 27 are respectively installed on the arc-shaped cover plate 25. The first atomizing nozzle group 26 corresponds to the coarse mixing area, and the second atomizing nozzle group 27 corresponds to the fine mixing area, so as to achieve segmented and precise water spraying.

[0026] The inner walls of both the first atomizing nozzle group 26 and the second atomizing nozzle group 27 are connected to connecting pipes 28. Electromagnetic flowmeters 29, electric variable frequency control valves 30, and pressure sensors 29 are sequentially installed in the middle of the connecting pipes 28. The electromagnetic flowmeter 29 monitors the water spray volume in real time, the electric variable frequency control valve 30 adjusts the water flow opening, and the pressure sensor 29 ensures stable water supply pressure. The ends of the two connecting pipes 28 are connected to the same tee pipe 32. The other end of the tee pipe 32 is connected to the hot water storage tank 34 via a variable frequency hot water delivery pump 33, forming a complete water supply loop. A water inlet is provided at the top of the hot water storage tank 34, and an electric water inlet valve is installed at the inlet. Equally spaced water inlets are installed on the inner wall. The water level sensor 35 can trigger the electric water supply valve to open and supply water when the water level in the water tank is less than 0.5m. A PLC controller 36 is installed on the outer wall of one side of the hot water storage tank 34. The PLC controller 36 adopts the Siemens S7-1200 model and is electrically connected to the first metering belt scale 2, the second metering belt scale 3, the first electric slide gate valve 6, the second electric slide gate valve 7, the variable frequency drive motor 16, the material level sensor 18, the temperature sensor 19, the online moisture analyzer 23, the electromagnetic flow meter 29, the electric variable frequency regulating valve 30, the pressure sensor 31, and the water level sensor 35 to realize the fully automated control of the process.

[0027] Working principle: When the device is running, the preheating and preparation process is started first. The electric heating tube of the hot water storage tank 34 is turned on to heat the water to the set value. The water level sensor 35 monitors the water level in the tank in real time to ensure that the water level is within the normal range. At the same time, the PLC controller 36 is started to complete the communication connection with each sensor and actuator, and set the threshold values ​​of various parameters, such as the ratio of dust removal ash to return ore, the water addition range, and the stirring speed range. After the water temperature and water level reach the standard, the first electric slide gate valve 6 and the second electric slide gate valve 7 are opened. The dust removal ash falls from the dust removal ash batching bin 4 into the first metering belt scale 2, and the return ore falls from the return ore batching bin 5 into the second metering belt scale 3. The two belt scales measure the material flow rate respectively and transmit the data to the PLC controller 36. The controller adjusts the valve opening according to the set ratio to ensure that the material is stably delivered to the discharge shell 1 in proportion.

[0028] After the material enters the outer shell 9 of the mixing cage, it enters the graded wetting and mixing process. The variable frequency drive motor 16 starts, driving the coarse section mixing shaft 12 and the fine section mixing shaft 13 to rotate. The large-lead spiral blades 14 of the coarse section quickly disperse the material. At the same time, the first atomizing nozzle group 26 draws hot water from the hot water storage tank 34 through the connecting pipe 28 and sprays it onto the surface of the material according to the set ratio to achieve preliminary wetting. The electromagnetic flowmeter 29 monitors the flow rate of the first atomizing nozzle group 26 in real time, and the pressure sensor 31 ensures that the water supply pressure is stable. After the material undergoes preliminary mixing in the coarse section mixing area for 30-40 seconds, it enters the fine section mixing area. The small-lead spiral blades 15 of the fine section perform a "kneading" action on the material. "During the mixing process, the second atomizing nozzle group 27 replenishes the remaining water. The inner arc-shaped guide plate 10 guides the material to form a circulating flow, preventing the material from sliding against the wall. The smooth ceramic liner 11 reduces material adhesion and ensures sufficient water penetration. During this process, the material level sensor 18 monitors the material filling rate in the mixing chamber. If the filling rate is too high, the PLC controller 36 reduces the motor speed and extends the mixing time. The temperature sensor 19 monitors the hot return ore temperature. If the temperature is too high, the water spray volume of the first atomizing nozzle group 26 is increased. The online moisture analyzer 23 detects the moisture content of the material before unloading. If the moisture content is not up to standard, the electric frequency conversion regulating valve 30 of the second atomizing nozzle group 27 is adjusted until the moisture content meets the requirements."

[0029] Finally, the material is conveyed and connected to the subsequent process. The fully wetted material enters the discharge chute 20 from the agitator shell 9. The high-frequency vibrator 21 vibrates at regular intervals to prevent the material from sticking in the chute. The silicon nitride ceramic plate 22 reduces the wear of the material on the chute. The material slides along the 75° inclined chute to the main mixing conveyor belt and is transported to a mixer to participate in the subsequent pelletizing process. Throughout the operation, the rock wool insulation layer 17 reduces the heat loss of the agitator shell 9. The maintenance door 37 is kept closed to prevent dust leakage. If maintenance is required, the electric slide valve can be closed to stop the material supply. After the material in the agitator is emptied, the variable frequency drive motor 16 and the variable frequency hot water delivery pump 33 are turned off. The maintenance door 37 is opened to clean the residual material inside. After maintenance is completed, the device can be restarted to enter the next operating cycle.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dust collector pre-wetting and mixing device, comprising a material discharge shell (1), characterized in that, The top two sides of the material discharge shell (1) are respectively equipped with a first metering belt scale (2) and a second metering belt scale (3). The dust removal ash batching bin (4) is fixed above the first metering belt scale (2) by bolts, and the return ore batching bin (5) is fixed above the second metering belt scale (3) by bolts. The top of the material discharge shell (1) is hinged with a dust cover plate (8), and the bottom of the material discharge shell (1) is fixedly connected with a stirring cage shell (9) by a flange. The inner wall of the stirring cage shell (9) is welded with three equally spaced inner arc-shaped guide plates (10), and the inner wall of each inner arc-shaped guide plate (10) is bonded with a smooth ceramic liner plate (11). A coarse section stirring shaft (12) is rotatably arranged at the axial center of the inner wall of the stirring cage shell (9), and a fine section stirring shaft (13) is fixed to one end of the coarse section stirring shaft (12) by bolts. A large lead spiral blade (14) is welded to the outer wall of the middle part of the coarse section stirring shaft (12), and a small lead spiral blade (15) is welded to the outer wall of the middle part of the fine section stirring shaft (13). A variable frequency drive motor (16) is connected to one end of the coarse section stirring shaft (12) through a coupling. A symmetrically distributed material level sensor (18) is inserted into the inner wall of one side of the stirring cage shell (9), and a symmetrically distributed temperature sensor (19) is installed on the inner wall of the bottom of the stirring cage shell (9). The end of the stirring cage shell (9) is fixed with a moisture online analyzer (23) by a bracket, and the top outer wall of the stirring cage shell (9) has two symmetrically distributed water spray channels (24). The inner wall of the water spray channels (24) is fixed with an arc-shaped cover plate (25) by screws, and a first atomizing nozzle group (26) and a second atomizing nozzle group (27) are respectively installed on the arc-shaped cover plate (25). One end of the first atomizing nozzle group (26) and the inner wall of the second atomizing nozzle group (27) are connected to a connecting pipe (28), and the connection... Electromagnetic flowmeter (29), electric variable frequency regulating valve (30) and pressure sensor (31) are installed sequentially in the middle of the pipe (28). The ends of the two connecting pipes (28) are connected to the same tee pipe (32), and the other end of the tee pipe (32) is connected to the hot water storage tank (34) through the variable frequency hot water delivery pump (33). The inner wall of the hot water storage tank (34) is equipped with water level sensors (35) that are evenly distributed, and a PLC controller (36) is installed on one side of the outer wall of the hot water storage tank (34).

2. The dust collector pre-wetting and mixing device according to claim 1, characterized in that, The bottom outlet of the dust removal ash batching silo (4) is equipped with a first electric slide gate valve (6), and the bottom outlet of the return ore batching silo (5) is equipped with a second electric slide gate valve (7).

3. The dust collector pre-wetting and mixing device according to claim 1, characterized in that, The included angle between the centers of the three inner arc-shaped guide plates (10) is 120°, and a retaining strip is welded to one side of the outer wall of the inner arc-shaped guide plate (10). A retaining groove is opened on the other side of the outer wall of the inner arc-shaped guide plate (10), and the retaining strip and the retaining groove are matched to form a tight fit.

4. The dust collector pre-wetting and mixing device according to claim 1, characterized in that, The outer wall of the stirring cage shell (9) is bonded with a rock wool insulation layer (17), and a maintenance slot is opened on one side of the outer wall of the stirring cage shell (9). The inner wall of the maintenance slot is fixed with a maintenance door (37) by bolts, and a sealing gasket is provided on the inner side of the maintenance door (37). The sealing gasket is made of oil-resistant rubber.

5. The dust collector pre-wetting and mixing device according to claim 1, characterized in that, The end of the auger shell (9) away from the variable frequency drive motor (16) is fixed with a discharge chute (20) by bolts, and a high frequency vibrator (21) is fixed to the bottom side of the discharge chute (20) by bolts. The inner wall of the discharge chute (20) is bonded with a silicon nitride ceramic plate (22), and the tilt angle of the discharge chute (20) is 75°.

6. The dust collector pre-wetting and mixing device according to claim 2, characterized in that, The PLC controller (36) adopts Siemens S7-1200, and the PLC controller (36) is electrically connected to the first metering belt scale (2), the second metering belt scale (3), the first electric slide gate valve (6), the second electric slide gate valve (7), the variable frequency drive motor (16), the material level sensor (18), the temperature sensor (19), the online moisture analyzer (23), the electromagnetic flow meter (29), the electric variable frequency regulating valve (30), the pressure sensor (31), and the three water level sensor (35).

7. The dust collector pre-wetting and mixing device according to claim 1, characterized in that, The hot water storage tank (34) is provided with a water inlet on the top. An electric water inlet valve is installed at the water inlet. The electric water inlet valve is electrically connected to the PLC controller (36). When the water level sensor (35) detects that the water level in the hot water storage tank (34) is less than 0.5m, the PLC controller (36) controls the electric water inlet valve to open and replenish water.

8. The dust collector pre-wetting and mixing device according to claim 1, characterized in that, The inner diameter of the smooth ceramic liner (11) is adapted to the outer diameter of the large-lead spiral blade (14), and the inner diameter of the smooth ceramic liner (11) is adapted to the outer diameter of the small-lead spiral blade (15).

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