Process for the production of a slag powder by suspension calcination

Abstract

The present application relates to the technical field of suspension calcination, in particular to a slag powder suspension calcination production process, a wind preheating system, a roasting system, a finished product cooling system and a tail gas treatment system, the cyclone preheating system comprises a first-stage preheating cyclone separator, a second-stage preheating cyclone separator and a third-stage preheating cyclone separator which are sequentially arranged from top to bottom; the roasting system comprises a gaseous suspension roasting furnace. In use, the present application realizes multi-stage preheating, can ensure complete preheating, and the preheated slag powder enters the rotary disc through the elbow, the rotary disc rotates under the driving of the rotary motor, the side plate rotates when the rotary disc rotates, and the slag powder on the rotary disc is scattered and scattered into the gaseous suspension roasting furnace at the cross section, thereby avoiding accumulation in the gaseous suspension roasting furnace and ensuring more uniform heating.

Description

Technical Field

[0001] This invention belongs to the field of suspension calcination technology, specifically the production process of suspension calcination of slag powder. Background Technology

[0002] Suspension calcination is a process technology that uses high-temperature gas flow to rapidly heat-treat materials in a suspended state. Its core principle is to use high-speed gas flow to uniformly disperse and suspend solid particles in a high-temperature environment, and utilize the efficient heat and mass transfer between the gas and solid phases to complete reactions such as decomposition, oxidation, reduction, or phase change of the material.

[0003] The existing suspension calcination process mainly includes the following steps: cyclone preheating, roasting, finished product cooling, and exhaust gas treatment.

[0004] When slag powder is calcined, because the slag powder is continuously conveyed, if the input amount is too large, some slag powder will not only be incompletely preheated, but also tend to settle below the feed inlet of the conveying pipe in the gas suspension roasting furnace, which will easily cause uneven heating of the slag powder and affect its overall effect.

[0005] In addition, in exhaust gas treatment, the flue gas after calcination of slag powder using suspension calcination technology contains a mixture of slag powder, sulfur-containing and NOx-containing gases. Currently, the treatment method for slag powder is to collect it using dust collector bags. This method is not only cumbersome to operate and inefficient, but the direct discharge of sulfur and NOx in the gas will pollute the environment. Summary of the Invention

[0006] This invention provides a process for producing slag powder by suspension calcination, which addresses the deficiencies in the prior art.

[0007] This invention is achieved through the following technical solution:

[0008] A slag powder suspension calcination production process, comprising a cyclone preheating system, a roasting system, a finished product cooling system, and a tail gas treatment system, is characterized in that: the cyclone preheating system includes a primary preheating cyclone separator, a secondary preheating cyclone separator, and a tertiary preheating cyclone separator arranged sequentially from top to bottom; the roasting system includes a gas suspension roasting furnace, where the material is fed into the inlet duct of the primary preheating cyclone separator via a distributor; the gas separated in the secondary preheating cyclone separator is discharged and enters the inlet duct of the primary preheating cyclone separator; the gas separated in the primary preheating cyclone separator enters the tail gas treatment system, where the slag powder first undergoes... After slag powder is collected by the slag powder collection system, it passes through the denitrification system for denitrification and then enters the desulfurization system for desulfurization of the tail gas. The denitrification system uses ammonia water for denitrification, and the desulfurization system uses limestone-gypsum method for desulfurization. The material preheated by the primary preheating cyclone separator is fed into the inlet pipe of the secondary preheating cyclone separator through the feed pipe. The gas discharged after separation in the tertiary preheating cyclone separator enters the inlet pipe of the secondary preheating cyclone separator. The material preheated by the secondary preheating cyclone separator is fed into the inlet pipe of the tertiary preheating cyclone separator through the feed pipe. The high-temperature gas from the gas suspension roasting furnace enters the tertiary preheating... The material, after being preheated by the three-stage preheating cyclone separator, enters the gas suspension roasting furnace via a dispersing device. The material in the gas suspension roasting furnace then enters the finished product cooling system. The dispersing device includes a hollow, top-and-bottom-closed disc. The right side of the disc has a flat cross-section, which is embedded in the side wall of the gas suspension roasting furnace and communicates with the interior. A rotating disc with an outer diameter matching the inner diameter of the disc is fitted to the disc. The outer edge of the rotating disc passes through the cross-section and is located inside the gas suspension roasting furnace. The dispersing device includes a hollow, top-and-bottom-closed disc with a flat cross-section on the right side. The disc is embedded in the side wall of the gas suspension roasting furnace and communicates with the interior of the gas suspension roasting furnace. The disc is adapted to a rotating disk with an outer diameter that is the same as the inner diameter of the disc. The outer edge of the rotating disk passes through the cross section and is located inside the gas suspension roasting furnace. Several side plates with their inner ends intersecting and located at the center of the disc are vertically connected to the top surface of the rotating disk along its circumference. A rotating shaft is vertically connected to the intersection of the side plates. The rotating shaft passes through the disc and is coaxially fixedly connected to the rotating motor shaft that is fixedly installed on the outer wall of the gas suspension roasting furnace. A feed inlet is opened downward on the top surface of the disc. One end of the feed inlet is connected upward to a bend pipe. The other end of the bend pipe is bent and connected to the discharge pipe of the three-stage preheating cyclone separator.

[0009] In use, the slag powder is conveyed by a distributor into a primary preheating cyclone separator, a secondary preheating cyclone separator, and a tertiary preheating cyclone separator before being preheated and finally roasted in a gaseous suspension roasting furnace. This multi-stage preheating ensures thorough preheating. Simultaneously, the preheated slag powder enters a rotating disc through a curved pipe. The rotating disc rotates under the drive of a rotating motor. As the disc rotates, it causes the side plates to rotate, which in turn causes the slag powder on the disc to disperse and be dispersed into the gaseous suspension roasting furnace at the cross-section. This prevents the slag powder from accumulating in the gaseous suspension roasting furnace and ensures more uniform heating.

[0010] The slag powder collection system includes a base plate and a rectangular vertical pipe fixed above the base plate. The left and right sides of the vertical pipe are connected to the upper ends of an air inlet pipe and a U-shaped pipe, respectively, along the same horizontal line. The other end of the air inlet pipe is connected to the outlets of a primary preheating cyclone separator and a secondary preheating cyclone separator. The lower end of the U-shaped pipe is connected to the right side of the vertical pipe. Inside the vertical pipe are a second and a third filter pipe of identical shape, respectively, opposite to the lower ends of the air inlet pipe and the U-shaped pipe. A first filter pipe is evenly spaced above the second filter pipe. The first, second, and third filter pipes are detachably and fixedly connected via connecting rods. First magnets are fixedly connected to the front and rear sides of the first, second, and third filter pipes, and small dust collection bags with left-facing openings are coaxially fixed inside. The vertical pipe passes through the second filter pipe in the front-to-back direction. The pipe and the corresponding first magnet are sealed. The inner wall of the vertical pipe is inlaid with an iron sheet that fits with the corresponding first magnet. The distance between the third filter pipe and the bottom plate is the sum of the vertical length of the connecting rod and the third filter pipe. When the third filter pipe is overloaded with dust, the first magnet and the iron sheet break under the action of gravity. The left side of the vertical pipe is also connected to the air outlet pipe opposite to the third filter pipe. The air outlet pipe is vertically connected to the upper air outlet main pipe. The upper air outlet main pipe is closed at both ends and is detachably fixed to a branch air outlet pipe through flanges. A large dust collector bag is detachably installed in the branch air outlet pipe. The branch air outlet pipe is vertically connected to the lower air outlet main pipe which is closed at both ends. The air outlet end of the lower air outlet main pipe is connected to the air inlet end of the desulfurization system. The upper air outlet main pipe is equipped with a solenoid valve to control the corresponding branch air outlet pipe. The lower end of the branch air outlet pipe is connected to a one-way valve that flows in the direction of the desulfurization system.

[0011] In operation, the slag powder collection system consists of three filter pipes arranged vertically within a vertical pipe: a first filter pipe, a second filter pipe, and a third filter pipe. Dust-laden flue gas enters the second filter pipe through the inlet pipe, where the dust is collected by small dust collection bags. The filtered flue gas then passes through the second filter pipe and enters the upper end of a U-shaped pipe, where it is guided by the U-shaped pipe to backflush the small dust collection bags in the third filter pipe. When the dust collection bags in the second filter pipe become overloaded, gravity causes the first filter pipe to move to the second filter pipe position to filter the dust-laden flue gas. The second filter pipe then moves to the third filter pipe position, and the backflushing dust enters the upper filter pipe through the outlet pipe. The main exhaust pipe collects dust from the large dust collector bags inside the corresponding branch exhaust pipes. The third filter pipe is moved to the ground for support. The third filter pipe and its corresponding connecting rod are then disassembled, and the small dust collector bags are cleaned a second time before being placed back in the original position of the first filter pipe. This process is repeated in a cycle. The dust in the large dust collector bags can be collected and then emptied by closing the corresponding valves, allowing the gas to flow into another branch exhaust pipe, then into the lower exhaust pipe, and finally into the desulfurization system. The closed branch exhaust pipes can be disassembled, and the slag powder in the dust collector bags can be collected.

[0012] Preferably, the first, second, and third filter tubes are coaxially and fixedly fitted with an inner tube. The inner tube is clearance-fitted with its corresponding counterpart. A strip groove is formed on the side of the inner tube. Small dust collector bags are placed within the inner tube. Opposite circular frames are provided at the inner ends of the small dust collector bags and within the inner tube. Several compression rods are evenly and vertically connected to the inner circular frames of the small dust collector bags along their circumference. The circular frames within the inner tube are fixedly installed. The small dust collector bags are compressed and fixedly connected by the compression rods and the inner tube. A cross frame is fixedly connected within the circular frames. The combined action of the inner tube, compression rods, cross frame, and circular frame effectively limits the movement of the small dust collector bags, preventing them from shaking.

[0013] Preferably, an arc-shaped scraper that fits against the small dust collector bag is provided between two adjacent extrusion rods. A connecting rod is vertically connected to the inner wall of the arc-shaped scraper. The connecting rod is connected to a circular plate. The circular plate has a threaded hole, and a lead screw is threaded into the threaded hole. The front end of the lead screw has a round rod, and a fan blade is sleeved on the round rod. The round rod drives the lead screw to rotate through a transmission mechanism. When the round rod rotates counterclockwise, it idles with the lead screw. A crossbar is vertically connected to any connecting rod. The crossbar passes through the inner tube and is located in the corresponding first filter tube, second filter tube, and third filter tube. The rear end of the lead screw is rotatably connected to the cross frame. A fixing rod is fixedly installed in the lower horizontal tube of the U-shaped tube. The fixing rod has a through hole. A sliding rod passes through the through hole, and a second magnet and an iron rod are fixedly installed at opposite ends of the sliding rod and the crossbar, respectively. The rod has a vertical rod bent downwards at the outer end of the sliding rod, and a third magnet is connected to the lower end of the vertical rod. The vertical rod is connected to the inner wall of the corresponding side of the U-shaped tube by a spring. The attraction force between the first magnet and the iron sheet is greater than the elastic force of the spring and less than the total weight of the first, second, and third filter tubes. A circular through groove starts downwards on the left side of the bottom surface of the lower horizontal tube of the U-shaped tube. The circular through groove is closed by a cover plate and is connected to the lower exhaust main pipe by a connecting exhaust pipe. A one-way valve is also installed on the lower exhaust main pipe, which flows to the desulfurization system through the connecting exhaust pipe. A second iron block is installed on the cover plate. The bottom surface of the third magnet and the top surface of the second iron block are on the same horizontal plane. When the second iron block and the third magnet are facing each other vertically, the arc-shaped scraper is on the far left of the small dust collector bag, and the spring is in a straight state. The fan blades in the second filter tube rotate counterclockwise under the influence of airflow, then idle, while the fan blades in the third filter tube rotate clockwise. This clockwise rotation of the fan blades drives the lead screw to rotate, which in turn causes the circular plate to tend to rotate. The circular plate is fixedly connected to the arc-shaped scraper, which can only move laterally under the constraint of the squeezing rod. Therefore, the rotation of the lead screw drives the lateral movement of the arc-shaped scraper, scraping the inner wall of the small dust collector bag. The lateral movement of the arc-shaped scraper drives the lateral movement of the crossbar, which, through the attraction of the second magnet and the iron rod, drives the lateral movement of the sliding rod. The lateral movement of the sliding rod is an extension... The spring drives the third magnet to move towards the second iron block. When the third magnet is above the second iron block, the arc-shaped scraper moves to the leftmost side of the small dust collector bag. The second iron block causes the cover plate to adhere to the third magnet. At this point, as the air continues to flow into the third filter tube, it encounters greater resistance through the small and large dust collector bags, but there is no resistance at the circular through-groove. Therefore, the air flows through the circular through-groove and into the lower main exhaust pipe via the connecting exhaust pipe, entering the desulfurization system for desulfurization. This results in smoother airflow, less blowing force when disassembling the branch exhaust pipe, and the arc-shaped scraper stops moving. When the second filter tube moves downwards, the second magnet disconnects from the iron rod, the spring pulls the sliding rod back to its initial position, and the cover plate falls under gravity. When the second filter tube reaches the third filter tube, the crossbar in the second filter tube continues to contact the sliding rod, continuing the aforementioned actions.

[0014] Preferably, the U-shaped tube has a limiting groove, within which a limiting rod is fitted. The limiting rod is vertically connected to the cover plate. Fixed baffles are fixedly connected to the upper and lower parts of the lower horizontal tube of the U-shaped tube, and a movable baffle is fixedly installed on the horizontal rod. When the second iron block is opposite to the third magnet, the fixed baffle and the movable baffle are located on the same vertical plane and seal the lower horizontal tube of the U-shaped tube. The limiting rod ensures vertical movement of the cover plate, while the fixed baffle not only ensures airflow acceleration at the fixed baffle but also forms a seal with the movable baffle, better ensuring airflow passes through the circular through-groove.

[0015] Preferably, the transmission mechanism includes a ratchet fixedly sleeved on a round rod and an outer tube coaxially sleeved on a lead screw. A pawl that engages with the ratchet is hinged inside the outer tube, and the pawl and the outer tube are fixedly connected by a spring. The engagement of the ratchet and pawl ensures that when the round rod rotates clockwise, it drives the lead screw to rotate via the outer tube, while rotating counterclockwise, it idles.

[0016] Preferably, the upper end of the vertical pipe is sealed with a detachable sealing cap to prevent gas from overflowing from the upper part of the vertical pipe.

[0017] Preferably, the upper end of the U-shaped tube is fixedly connected to the support rod, and the lower end of the support rod is vertically connected to the top surface of the base plate.

[0018] Preferably, the top and bottom surfaces of the first, second, and third filter tubes are vertically provided with blind holes, and a first electromagnet is fixedly installed inside each blind hole. First iron blocks that attract the first electromagnets are fixedly installed at both ends of the connecting rod. The attraction between the first electromagnets and the first iron blocks ensures that, when needed, the first electromagnets generate a pulling force to maintain the connection between the connecting rod and the corresponding first, second, and third filter tubes. Furthermore, when needed, de-energizing the connecting rod facilitates its disengagement from the first, second, and third filter tubes.

[0019] The beneficial effects of this invention are as follows: In this application, slag powder is conveyed by a feeder into a primary preheating cyclone separator, a secondary preheating cyclone separator, and a tertiary preheating cyclone separator for preheating, and finally roasted in a gaseous suspension roasting furnace. This achieves multi-stage preheating, ensuring thorough preheating. Simultaneously, the preheated slag powder enters a rotating disc through a bent pipe. The rotating disc rotates under the drive of a rotating motor. When the rotating disc rotates, it drives the side plates to rotate, thereby causing the slag powder on the rotating disc to disperse and be dispersed into the gaseous suspension roasting furnace at the cross-section, avoiding accumulation in the gaseous suspension roasting furnace and ensuring more uniform heating. Simultaneously, while collecting dust through the first, second, and third filter tubes, the system can automatically move downwards and replace the small dust collector bag when the dust collection is overloaded. Furthermore, it can utilize the back-blowing force of the gas to blow the small dust collector bag filled with dust into the large dust collector bag, thereby achieving automatic dust collection. This not only saves workers the time and effort of disassembling the dust collector bags, but also greatly improves work efficiency because it does not require machine shutdown. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the process flow of the present invention;

[0022] Figure 2 This is a schematic diagram of the exhaust gas treatment system.

[0023] Figure 3 This is a schematic diagram of the arc-shaped scraper distribution;

[0024] Figure 4 This is a schematic diagram of the ratchet and pawl engagement;

[0025] Figure 5 yes Figure 2 A schematic diagram of direction A;

[0026] Figure 6 yes Figure 2 A magnified view of part of I;

[0027] Figure 7 yes Figure 2 Enlarged view of part II;

[0028] Figure 8 This is a schematic diagram of the bulk material handling unit.

[0029] Figure 9 yes Figure 8 A schematic diagram of the B-direction structure.

[0030] As shown in the figure:

[0031] 1. Vertical pipe, 2. Inlet pipe, 3. U-shaped pipe, 4. First filter pipe, 5. Second filter pipe, 6. Third filter pipe, 7. Small dust collector bag, 8. First magnet, 9. Iron sheet, 10. Connecting rod, 11. Large dust collector bag, 12. Outlet pipe, 13. Inner pipe, 14. Extrusion rod, 15. Cross frame, 16. Arc scraper, 17. Lead screw, 18. Round rod, 19. Fan blade, 20. Sliding rod, 21. Horizontal rod, 22. Second magnet, 23. Third magnet, 24. Spring, 25. Limiting rod, 26. 27. Fixed baffle plate, 28. Movable baffle plate, 29. Outer pipe, 30. Pawl, 31. Ratchet, 32. First electromagnet, 33. Bend, 34. Rotary motor, 35. Rotary disk, 36. Circular disk, 37. Side plate, 38. Upper exhaust manifold, 39. Branch exhaust manifold, 40. Denitrification system, 41. Desulfurization system, H1. Primary preheating cyclone separator, H2. Secondary preheating cyclone separator, H3. Tertiary preheating cyclone separator, H4. Gas suspension roasting furnace, A1. Material distributor. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Slag powder suspension calcination production process, such as Figures 1-9As shown. It includes a cyclone preheating system, a roasting system, a finished product cooling system, and a tail gas treatment system. The cyclone preheating system comprises a primary preheating cyclone separator H1, a secondary preheating cyclone separator H2, and a tertiary preheating cyclone separator H3 arranged sequentially from top to bottom. The roasting system includes a gas suspension roasting furnace H4. Material is fed into the inlet duct of the primary preheating cyclone separator H1 via a feeder A1. Gas separated in the secondary preheating cyclone separator H2 is discharged and enters the inlet duct of the primary preheating cyclone separator H1. Gas separated in the primary preheating cyclone separator H1 enters the tail gas treatment system, where it is first collected by a slag collection system. After the slag enters the denitrification system 40 for denitrification, it then enters the desulfurization system 41 for desulfurization. Material preheated by the primary preheating cyclone separator H1 is fed into the inlet pipe of the secondary preheating cyclone separator H2 via the feed pipe. Gas discharged after separation in the tertiary preheating cyclone separator H3 enters the inlet pipe of the secondary preheating cyclone separator H2. Material preheated by the secondary preheating cyclone separator H2 is fed into the inlet pipe of the tertiary preheating cyclone separator H3 via the feed pipe. High-temperature gas from the gas suspension roasting furnace H4 enters the inlet pipe of the tertiary preheating cyclone separator H3. Material preheated by the tertiary preheating cyclone separator H3 is then fed into the dispersing device. The material enters the gaseous suspension roasting furnace H4, where it enters the finished product cooling system. The material distribution device includes a hollow, top-and-bottom-closed disc 35. The right side of the disc 35 has a flat cut, and this cut is embedded in the side wall of the gaseous suspension roasting furnace H4 and communicates with the interior of the furnace. The disc 35 is fitted with a rotating disc 34 whose outer diameter matches its inner diameter. The outer edge of the rotating disc 34 passes through the cut and is located inside the gaseous suspension roasting furnace H4. The material distribution device includes a hollow, top-and-bottom-closed disc 35. The right side of the disc 35 has a flat cut, and this cut is embedded in the side wall of the gaseous suspension roasting furnace H4 and communicates with the interior of the furnace. The internal structure of the suspension roasting furnace is interconnected. The disc 35 is fitted with a rotating disc 34 whose outer diameter is the same as the inner diameter of the disc 35. The outer edge of the rotating disc 34 passes through the cross section and is located inside the gas suspension roasting furnace H4. Several side plates 36 with their inner ends intersecting at the center of the disc 35 are vertically connected to the top surface of the rotating disc 34 along its circumference. A rotating shaft is vertically connected upward at the intersection of the side plates 36. The rotating shaft passes through the disc 35 and is coaxially fixedly connected to the rotating shaft of the rotating motor 33, which is fixedly installed on the outer wall of the gas suspension roasting furnace H4. The top surface of the disc 35 has a feed inlet facing downward. One end of the feed inlet is connected upward to a bent pipe 32. The other end of the bent pipe 32 is bent and connected to the discharge pipe of the three-stage preheating cyclone separator.

[0034] In use, the slag powder is conveyed by the distributor A1 into the primary preheating cyclone separator H1, the secondary preheating cyclone separator H2, and the tertiary preheating cyclone separator before being roasted in the gas suspension roasting furnace H4. This multi-stage preheating ensures thorough preheating. Simultaneously, the preheated slag powder enters the rotating disk 34 through the bent pipe 32. The rotating disk 34 rotates under the drive of the rotating motor 33. As the rotating disk 34 rotates, it drives the side plate 36 to rotate, which in turn causes the slag powder on the rotating disk 34 to disperse and be dispersed into the gas suspension roasting furnace H4 at the cross-section, preventing accumulation in the gas suspension roasting furnace H4 and ensuring more uniform heating.

[0035] The exhaust gas treatment system includes a slag collection system, a denitrification system 40, and a desulfurization system 41. The denitrification system 40 uses ammonia water for denitrification, and the desulfurization system 41 uses limestone-gypsum desulfurization. The slag collection system includes a base plate and a vertically fixed rectangular vertical pipe 1 above the base plate. The left and right sides of the vertical pipe 1 are connected to the upper ends of an inlet pipe 2 and a U-shaped pipe 3 along the same horizontal line, respectively. The other end of the inlet pipe 2 is connected to the outlet of the first-stage preheating cyclone separator H1. The lower end of the U-shaped pipe 3 is connected to the right side of the vertical pipe 1. The vertical pipe 1 contains a second slag collection system of the same shape, which is opposite to the lower ends of the inlet pipe 2 and the U-shaped pipe 3. The filter tube 5 and the third filter tube 6 are provided. The first filter tube 4 is provided at equal intervals above the second filter tube 5. The first filter tube 4, the second filter tube 5 and the third filter tube 6 are detachably and fixedly connected by the connecting rod 10. The first filter tube 4, the second filter tube 5 and the third filter tube 6 are fixedly connected to the front and rear sides by the first magnet 8 and the small dust collection bag 7 with the opening facing left is fixedly installed coaxially inside. Specifically, the first filter tube 4, the second filter tube 5 and the third filter tube 6 are coaxially and fixedly provided with the inner tube 13. The inner tube 13 is connected and communicated with the corresponding first filter tube 4, the second filter tube 5 and the third filter tube 6 through the tapered tube. The inner tube 13 is fitted with the corresponding first filter tube 4, second filter tube 5 and third filter tube 6 with a clearance. A strip groove is opened on the side of the inner tube 13. The small dust collector bag 7 is placed in the inner tube 13. A circular frame is fixedly installed in both the inner tube 13 and the small dust collector bag. The inner end of the small dust collector bag 7 is supported by the circular frame. Several extrusion rods 14 are evenly and vertically connected to the circular frame in the small dust collector bag along its circumference. The small dust collector bag 7 is squeezed and fixedly connected by the extrusion rods 14 and the inner tube 13. A cross frame 15 is fixedly connected in the circular frame. The vertical pipe 1 is sealed in the front-to-back direction by the second filter pipe 5 and the corresponding first magnet 8. The inner wall of the vertical pipe 1 is inlaid with an iron sheet 9 that fits against the corresponding first magnet 8. The distance between the third filter pipe 6 and the bottom plate is the sum of the vertical lengths of the connecting rod 10 and the third filter pipe 6. When the third filter pipe 6 is overloaded with dust, the first magnet 8 and the iron sheet 9 break under the action of gravity. The left side of the vertical pipe 1 is also connected to an air outlet pipe 12 opposite to the third filter pipe 6. The air outlet pipe is vertically connected to the upper air outlet main pipe 3. 7. The upper main exhaust pipe 37 is closed at both ends and detachably fixed to a branch exhaust pipe 38 via flanges. A large dust collector bag is detachably installed inside the branch exhaust pipe 38. The branch exhaust pipe 38 is vertical and connected to a lower main exhaust pipe 39 that is closed at both ends. The exhaust end of the lower main exhaust pipe 39 is connected to the intake end of the denitrification system 40. The upper main exhaust pipe 37 is equipped with a solenoid valve that controls the corresponding branch exhaust pipe 38. The lower end of the branch exhaust pipe 38 is connected to a one-way valve that flows in the direction of the denitrification system 40.

[0036] Between two adjacent extrusion rods 14, there is an arc-shaped scraper 16 that fits against the small dust collector bag 7. A connecting rod 10 is vertically connected to the inner wall of the arc-shaped scraper 16. The connecting rod 10 is connected to a circular plate. A threaded hole is opened on the circular plate, and a screw 17 is threaded into the threaded hole. A round shaft is coaxially fixed to the rear end of the screw. A through hole is opened on the cross frame. The round shaft passes through the through hole and is rotatably connected to the through hole through a bearing. A round rod 18 is provided on the front side of the screw 17. A fan blade 19 is sleeved on the round rod 18. The round rod 18 drives the screw 17 to rotate through the transmission mechanism. When the round rod 18 rotates counterclockwise, it rotates freely with the screw 17. A horizontal rod 21 is vertically connected to any connecting rod 10. The horizontal rod 21 passes through the inner tube 13 and is located in the corresponding first filter tube 4, second filter tube 5, and third filter tube 6. A horizontal tube is fixedly installed in the lower part of the U-shaped tube 3. A fixed rod has a through hole at the beginning of the fixed rod. A sliding rod 20 passes through the through hole, and a second magnet 22 and an iron rod are fixedly installed at the opposite ends of the sliding rod 20 and the horizontal rod 21, respectively. The outer end of the sliding rod 20 is bent downward to form a vertical rod, and the lower end of the vertical rod is connected to a third magnet 23. The vertical rod is connected to the inner wall of the corresponding side of the U-shaped tube 3 by a spring 24. The attraction force between the first magnet 8 and the iron rod is greater than the elastic force of the spring 24 and less than the total weight of the first filter tube 4, the second filter tube 5 and the third filter tube 6. A circular through groove starts downward on the left side of the bottom surface of the lower horizontal tube of the U-shaped tube 3. The circular through groove is closed by a cover plate, and a second iron block is set on the cover plate. The bottom surface of the third magnet 23 and the top surface of the second iron block are located on the same horizontal plane. When the second iron block and the third magnet 23 are facing each other vertically, the arc-shaped scraper 16 is on the far left of the small dust collector bag 7, and the spring 24 is in a straight state.

[0037] The inner tube 13, the extrusion rod 14, the cross frame 15 and the circular frame work together to limit the movement of the small dust collector bag 7 and prevent it from shaking.

[0038] In use, the first filter pipe 4, the second filter pipe 5, and the third filter pipe 6 are arranged vertically within the vertical pipe 1. Dust-laden flue gas enters the second filter pipe 5 through the inlet pipe 2, and the dust is collected by the small dust collector bags 7 within the second filter pipe 5. The filtered flue gas then enters the upper end of the U-shaped pipe 3 after passing through the second filter pipe 5, and under the guidance of the U-shaped pipe 3, it backflushs the small dust collector bags 7 within the third filter pipe 6. When the dust in the small dust collector bags 7 within the second filter pipe 5 becomes overloaded, under gravity, the first filter pipe 4 moves to the second filter pipe 5 to filter the dust-laden flue gas. The second filter pipe 5 then moves to the third filter pipe 6, and under the backflush of the flue gas, the dust enters the upper exhaust manifold 37 through the exhaust pipe 12, and then enters the large dust collector bags in the corresponding branch exhaust pipes 38 for collection. The first filter tube is moved to the ground for support. Then, the third filter tube and its corresponding connecting rod are disassembled, and the small dust collector bag is cleaned a second time before being placed back in the original position of the first filter tube. This process is repeated. The dust in the large dust collector bag 11 can be collected and emptied by disassembling the bag. Specifically, the corresponding valve is closed, allowing the gas to flow into another branch outlet pipe 38, and then into the lower main outlet pipe 39, and finally into the denitrification system 40. The closed branch outlet pipe 38 can be disassembled and the slag powder in the dust collector bag can be collected. The third filter tube 6 is moved to the ground for support. Then, the third filter tube 6 and its corresponding connecting rod 10 are disassembled, and the small dust collector bag 7 is cleaned a second time before being placed back in the original position of the first filter tube 4. This process is repeated.

[0039] In the second filter tube 5, the fan blade 19 rotates counterclockwise under the influence of airflow, and then idles. Meanwhile, the fan blade 19 in the third filter tube 6 rotates clockwise. This clockwise rotation of the fan blade 19 drives the lead screw 17 to rotate, causing the circular plate to tend to rotate. The circular plate is fixedly connected to the arc-shaped scraper 16, which can only move laterally under the constraint of the extrusion rod 14. Therefore, the rotation of the lead screw 17 drives the lateral movement of the arc-shaped scraper 16, scraping the inner wall of the small dust collector bag 7. The lateral movement of the arc-shaped scraper 16 drives the lateral movement of the crossbar 21, which is driven by the attraction of the second magnet 22 and the iron rod. The lateral movement of the slide bar 20 stretches the spring 24 and moves the third magnet 23 towards the second iron block. When the third magnet 23 is above the second iron block, the arc-shaped scraper 16 moves to the leftmost side of the small dust collector bag 7. The second iron block causes the cover plate to adhere to the third magnet 23. At this moment, as the air continues to flow into the third filter tube 6, it will pass through the small dust collector bag 7 and the large dust collector bag 11, where there is high resistance. However, there is no resistance at the circular through-groove, so the airflow will pass through the circular through-groove, resulting in smoother airflow. At the same time, the blowing force when disassembling the large dust collector bag 11 is smaller, and the arc-shaped scraper 16 stops moving. When the second filter tube 5 moves downward, the second magnet 22 disconnects from the iron bar, the spring 24 pulls the slide bar 20 back to its initial position, and the cover plate falls under gravity. When the second filter tube 5 falls to the third filter tube 6, the crossbar 21 in the second filter tube 5 continues to contact the slide bar 20, and the above actions continue. After the third filter tube falls off, it is removed and the screw 17 is rotated in the opposite direction by the round shaft, so that the arc-shaped scraper 16 and the crossbar return to their initial positions. To facilitate the rotation of the screw 17, a rotating handle is installed at the end of the round shaft.

[0040] The U-shaped tube 3 has a limiting groove, and a limiting rod 25 is fitted inside the limiting groove. The limiting rod 25 is vertically connected to the cover plate. Fixed blocking plates 26 are fixedly connected to the upper and lower parts of the lower horizontal tube of the U-shaped tube 3. A movable blocking plate 27 is fixedly installed on the crossbar 21. When the second iron block is opposite to the third magnet 23, the fixed blocking plate 26 and the movable blocking plate 27 are located on the same vertical plane and seal the lower horizontal tube of the U-shaped tube 3. The limiting rod 25 can ensure the vertical movement of the cover plate, while the fixed blocking plate 26 can not only ensure the airflow acceleration at the fixed blocking plate 26, but also form a seal with the movable blocking plate 27, better ensuring that the airflow passes through the circular through-groove.

[0041] The transmission mechanism includes a ratchet 30 fixedly sleeved on a round rod 18 and an outer tube 28 coaxially sleeved on a lead screw 17. A pawl 29, which engages with the ratchet 30, is hinged inside the outer tube 28. The pawl 29 and the outer tube 28 are fixedly connected by a spring 24. The engagement of the ratchet 30 and the pawl 29 ensures that when the round rod 18 rotates clockwise, it drives the lead screw 17 to rotate via the outer tube 28; when it rotates counterclockwise, it idles.

[0042] The upper end of the vertical pipe 1 is sealed with a detachable sealing cap to prevent gas from overflowing from the upper part of the vertical pipe 1.

[0043] The upper end of the U-shaped tube 3 is fixedly connected to the support rod, and the lower end of the support rod is vertically connected to the top surface of the base plate.

[0044] The top and bottom surfaces of the first filter tube 4, the second filter tube 5, and the third filter tube 6 are all vertically provided with blind holes. A first electromagnet 31 is fixedly installed in each blind hole, and first iron blocks that attract the first electromagnet 31 are fixedly installed at both ends of the connecting rod 10. The attraction between the first electromagnet 31 and the first iron blocks ensures that when needed, the first electromagnet 31 generates a magnetic force to ensure the connection between the connecting rod 10 and the corresponding first filter tube 4, second filter tube 5, and third filter tube 6. Furthermore, when needed, de-energizing the connecting rod 10 facilitates disengagement from the first filter tube 4, second filter tube 5, and third filter tube 6.

[0045] In this application, slag powder is conveyed by a distributor and sequentially enters a primary preheating cyclone separator, a secondary preheating cyclone separator, and a tertiary preheating cyclone separator before being roasted in a gaseous suspension roasting furnace. This multi-stage preheating ensures thorough preheating. Simultaneously, the preheated slag powder enters a rotating disc through a curved pipe. The rotating disc rotates under the drive of a rotating motor. As the disc rotates, it causes the side plates to rotate, which in turn causes the slag powder on the disc to disperse and be dispersed into the gaseous suspension roasting furnace at the cross-section. This prevents the slag powder from accumulating in the gaseous suspension roasting furnace and ensures more uniform heating. Simultaneously, while collecting dust through the first, second, and third filter tubes, the system can automatically move downwards and replace the small dust collector bag when the dust collection is overloaded. Furthermore, it can utilize the back-blowing force of the gas to blow the small dust collector bag filled with dust into the large dust collector bag, thereby achieving automatic dust collection. This not only saves workers the time and effort of disassembling the dust collector bags, but also greatly improves work efficiency because it does not require machine shutdown.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A slag powder suspension calcination production process, including a cyclone preheating system, a roasting system, a finished product cooling system, and a tail gas treatment system, characterized in that: The cyclone preheating system includes a primary preheating cyclone separator, a secondary preheating cyclone separator, and a tertiary preheating cyclone separator arranged sequentially from top to bottom. The roasting system includes a gas suspension roasting furnace. Material is fed into the inlet duct of the primary preheating cyclone separator via a distributor. Gas separated in the secondary preheating cyclone separator is discharged and enters the inlet duct of the primary preheating cyclone separator. Gas separated in the primary preheating cyclone separator enters the exhaust gas treatment system. Material preheated by the primary preheating cyclone separator is fed into the secondary preheating cyclone separator via a feed pipe. The gas discharged after separation in the three-stage preheating cyclone separator enters the inlet duct of the two-stage preheating cyclone separator. The material preheated by the two-stage preheating cyclone separator is fed into the inlet duct of the three-stage preheating cyclone separator through the feed pipe. The high-temperature gas from the gas suspension roasting furnace enters the inlet duct of the three-stage preheating cyclone separator. The material preheated by the three-stage preheating cyclone separator enters the gas suspension roasting furnace through the dispersing device. The material in the gas suspension roasting furnace enters the finished product cooling system. The exhaust gas treatment... The system includes a slag powder collection system, a denitrification system, and a desulfurization system. Gas separated by a primary preheating cyclone separator sequentially enters the slag powder collection system to collect the slag powder, then re-enters the denitrification system for denitrification, and finally enters the desulfurization system for desulfurization. The denitrification system uses ammonia water for denitrification, and the desulfurization system uses the limestone-gypsum method. The bulk material device includes a hollow, closed disc. The right side of the disc has a flat cross-section, which is embedded in the side wall of the gas suspension roasting furnace and communicates with the interior of the gas suspension roasting furnace. The disc is suitable for… It is equipped with a rotating disk with an outer diameter that is the same as the inner diameter of the disc. The outer edge of the rotating disk passes through the cross section and is located inside the gas suspension roasting furnace. Several side plates with their inner ends intersecting at the center of the disc are vertically connected to the top surface of the rotating disk along its circumference. A rotating shaft is vertically connected to the intersection of the side plates. The rotating shaft passes through the disc and is coaxially fixedly connected to the rotating motor shaft that is fixedly installed on the outer wall of the gas suspension roasting furnace. A feed inlet is opened downward on the top surface of the disc. One end of the feed inlet is connected upward to a bend pipe. The other end of the bend pipe is bent and connected to the discharge pipe of the three-stage preheating cyclone separator.

2. The slag powder suspension calcination production process according to claim 1, characterized in that: The slag powder collection system includes a base plate and a rectangular vertical pipe fixed above the base plate. The left and right sides of the vertical pipe are connected to the upper ends of an air inlet pipe and a U-shaped pipe, respectively, along the same horizontal line. The other end of the air inlet pipe is connected to the outlets of a primary preheating cyclone separator and a secondary preheating cyclone separator. The lower end of the U-shaped pipe is connected to the right side of the vertical pipe. Inside the vertical pipe are a second and a third filter pipe of identical shape, respectively, opposite to the lower ends of the air inlet pipe and the U-shaped pipe. A first filter pipe is evenly spaced above the second filter pipe. The first, second, and third filter pipes are detachably and fixedly connected via connecting rods. First magnets are fixedly connected to the front and rear sides of the first, second, and third filter pipes, and small dust collection bags with left-facing openings are coaxially fixed inside. The vertical pipe passes through the second filter pipe in the front-to-back direction. The pipe and the corresponding first magnet are sealed. The inner wall of the vertical pipe is inlaid with an iron sheet that fits with the corresponding first magnet. The distance between the third filter pipe and the bottom plate is the sum of the vertical length of the connecting rod and the third filter pipe. When the third filter pipe is overloaded with dust, the first magnet and the iron sheet break under the action of gravity. The left side of the vertical pipe is also connected to the air outlet pipe opposite to the third filter pipe. The air outlet pipe is vertically connected to the upper air outlet main pipe. The upper air outlet main pipe is closed at both ends and is detachably fixed to a branch air outlet pipe through flanges. A large dust collector bag is detachably installed in the branch air outlet pipe. The branch air outlet pipe is vertically connected to the lower air outlet main pipe which is closed at both ends. The air outlet end of the lower air outlet main pipe is connected to the air inlet end of the desulfurization system. The upper air outlet main pipe is equipped with a solenoid valve to control the corresponding branch air outlet pipe. The lower end of the branch air outlet pipe is connected to a one-way valve that flows in the direction of the desulfurization system.

3. The slag powder suspension calcination production process according to claim 2, characterized in that: The first, second, and third filter tubes are coaxially and fixedly equipped with an inner tube. The inner tube is clearance-fitted with the corresponding first, second, and third filter tubes. A strip groove is opened on the side of the inner tube. Small dust collector bags are placed in the inner tube. The inner end of the small dust collector bag and the inner tube are equipped with opposing circular frames. Several extrusion rods are evenly and vertically connected to the inner circular frame of the small dust collector bag along its circumference. The circular frame in the inner tube is fixedly installed in the inner tube. The small dust collector bag is squeezed and fixedly connected by the extrusion rods and the inner tube. A cross frame is fixedly connected inside the circular frame.

4. The slag powder suspension calcination production process according to claim 3, characterized in that: Between two adjacent extrusion rods is an arc-shaped scraper that fits against the small dust collector bag. A connecting rod is vertically connected to the inner wall of the arc-shaped scraper. The connecting rod is connected to a circular plate with threaded holes. A lead screw is threaded into the threaded holes. The front end of the lead screw has a round rod with a fan blade sleeved on it. The round rod drives the lead screw to rotate via a transmission mechanism. When the round rod rotates counterclockwise, it rotates freely with the lead screw. A crossbar is vertically connected to any connecting rod. The crossbar passes through the inner tube and is located in the corresponding first, second, and third filter tubes. The rear end of the lead screw is rotatably connected to a cross frame. A fixing rod is fixedly installed in the lower horizontal tube of the U-shaped tube. The fixing rod has a through hole. A sliding rod passes through the through hole, and a second magnet and an iron rod are fixedly installed at the opposite ends of the sliding rod and the crossbar, respectively. The outer end of the slide rod bends downward to form a vertical rod, and the lower end of the vertical rod is connected to a third magnet. The vertical rod is connected to the inner wall of the corresponding side of the U-shaped tube by a spring. The attraction force between the first magnet and the iron sheet is greater than the elastic force of the spring and less than the total weight of the first filter tube, the second filter tube and the third filter tube. A circular through groove starts downward from the left side of the bottom surface of the lower horizontal tube of the U-shaped tube. The circular through groove is closed by a cover plate. The circular through groove is connected to the lower exhaust main pipe by a connecting exhaust pipe. A one-way valve is also installed on the lower exhaust main pipe, which flows to the desulfurization system through the connecting exhaust pipe. A second iron block is installed on the cover plate. The bottom surface of the third magnet and the top surface of the second iron block are on the same horizontal plane. When the second iron block and the third magnet are facing each other vertically, the arc-shaped scraper is on the far left of the small dust collector bag, and the spring is in a straight state.

5. The slag powder suspension calcination production process according to claim 4, characterized in that: A limiting groove is provided on the U-shaped tube, and a limiting rod is provided in the limiting groove. The limiting rod is vertically connected to the cover plate. Fixed blocking plates are fixedly connected to the upper and lower parts of the lower horizontal tube of the U-shaped tube. A movable blocking plate is fixedly installed on the horizontal bar. When the second iron block is opposite to the third magnet, the fixed blocking plate and the movable blocking plate are located on the same vertical plane and seal the lower horizontal tube of the U-shaped tube.

6. The slag powder suspension calcination production process according to claim 5, characterized in that: The transmission mechanism includes a ratchet fixedly sleeved on a round rod and an outer tube coaxially sleeved on a lead screw. A pawl that cooperates with the ratchet is hinged inside the outer tube, and the pawl and the outer tube are fixedly connected by a spring.

7. The slag powder suspension calcination production process according to claim 2, characterized in that: The upper end of the vertical pipe is sealed with a removable sealing cap.

8. The slag powder suspension calcination production process according to claim 2, characterized in that: The upper end of the U-shaped tube is fixedly connected to the support rod, and the lower end of the support rod is vertically connected to the top surface of the base plate.

9. The slag powder suspension calcination production process according to claim 2, characterized in that: The top and bottom surfaces of the first, second, and third filter tubes are all vertically provided with blind holes. A first electromagnet is fixedly installed inside the blind hole, and a first iron block that attracts the first electromagnet is fixedly installed at both ends of the connecting rod.

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