Slag powder suspension calcination production process

Abstract

The invention relates to the technical field of suspension calcination, in particular to a slag powder suspension calcination production process which comprises an air preheating system, a calcination system, a finished product cooling system and a tail gas treatment system, and the air 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 roaster. When the device is used, multi-stage preheating is achieved, thorough preheating can be guaranteed, meanwhile, preheated slag powder enters the rotating disc through the bent pipe, the rotating disc is driven by the rotating motor to rotate, when the rotating disc rotates, the side plates are driven to rotate, and then the slag powder on the rotating disc is driven to be scattered and scattered into the gaseous suspension roaster at the section; the accumulation of the gaseous suspension roaster is avoided, and the heating is more uniform.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of suspension calcination, and in particular to a slag powder suspension calcination production process. BACKGROUND

[0002] The suspension calcination process is a process technology that utilizes high-temperature gas flow to rapidly heat treat materials in a suspended state. The core principle is to uniformly disperse and suspend solid particles in a high-temperature environment through high-speed gas flow, utilize the high-efficiency heat and mass transfer between the gas-solid two phases, and complete the decomposition, oxidation, reduction, or phase change reactions of the materials.

[0003] Among them, the existing suspension calcination process mainly includes the above steps of cyclone preheating, roasting, product cooling, and tail gas treatment.

[0004] Among them, when the slag powder is calcined, since the slag powder is continuously conveyed, if the input is too much, it will cause part of the slag powder not only to be incompletely preheated, but also to be easily deposited below the discharge port of the conveying pipeline in the gaseous suspension roasting furnace, which can easily cause the slag powder to be unevenly heated, affecting its overall effect.

[0005] In addition, in the tail gas treatment, there is a mixture of slag powder, sulfur-containing gas, and NOx-containing gas in the flue gas after the slag powder is calcined using the suspension calcination technology. Currently, the treatment method for the slag powder is to collect it using a dust cloth bag. This method is not only cumbersome to operate but also has low work efficiency, and the sulfur and NOx in the gas directly discharged will pollute the environment. SUMMARY

[0006] The present application provides a slag powder suspension calcination production process to solve the defects in the prior art.

[0007] The present application is implemented by the following technical solutions: The production process of the slag powder suspension calcination comprises a cyclone preheating system, a calcination system, a finished product cooling system and a tail gas treatment system, and is characterized in that: the cyclone preheating system comprises a first-stage preheating cyclone separator, a second-stage preheating cyclone separator and a third-stage preheating cyclone separator arranged in sequence from top to bottom; the calcination system comprises a gaseous suspension calcination furnace, the material is fed into the air inlet pipe of the first-stage preheating cyclone separator through the distributor, the gas separated in the second-stage preheating cyclone separator is discharged and enters the air inlet pipe of the first-stage preheating cyclone separator, the gas separated in the first-stage preheating cyclone separator enters the tail gas treatment system, the slag powder is first collected by the slag powder collecting system in the tail gas treatment system, then denitrified by the denitrification system and then enters the desulfurization system for desulfurization, the denitrification system adopts the ammonia water denitrification mode, and the desulfurization system adopts the limestone-gypsum desulfurization method; the material preheated from the first-stage preheating cyclone separator is fed into the air inlet pipe of the second-stage preheating cyclone separator through the discharge pipe, and the gas separated in the third-stage preheating cyclone separator is discharged and enters the air inlet pipe of the second-stage preheating cyclone separator, the material preheated from the second-stage preheating cyclone separator is fed into the air inlet pipe of the third-stage preheating cyclone separator through the discharge pipe, the high-temperature gas from the gaseous suspension calcination furnace enters the air inlet pipe of the third-stage preheating cyclone separator, and the material preheated in the third-stage preheating cyclone separator enters the gaseous suspension calcination furnace through the bulk material device, and the material in the gaseous suspension calcination furnace enters the finished product cooling system; the bulk material device comprises a hollow and closed disc, the right side of the disc is a flat-cut section, the disc section is inlaid in the side wall of the gaseous suspension calcination furnace and communicates with the inside of the gaseous suspension calcination furnace, and the disc is matched with a rotating disc with an outer diameter consistent with the inner diameter of the disc, the outer edge of the rotating disc penetrates through the section and is located in the gaseous suspension calcination furnace, the bulk material device comprises a hollow and closed disc, the right side of the disc is a flat-cut section, the disc section is inlaid in the side wall of the gaseous suspension calcination furnace and communicates with the inside of the gaseous suspension calcination furnace, and the disc is matched with a rotating disc with an outer diameter consistent with the inner diameter of the disc, the outer edge of the rotating disc penetrates through the section and is located in the gaseous suspension calcination furnace, the top surface of the rotating disc is vertically connected with a plurality of side plates intersecting at the inner end and the center of the disc along the circumferential direction, the side plates are vertically connected with a rotating shaft at the intersection, the rotating shaft penetrates through the disc and is coaxially fixedly connected with the rotating shaft of the rotating motor fixedly arranged on the outer side wall of the gaseous suspension calcination furnace, the top surface of the disc is downwardly provided with a feeding port, the feeding port is upwardly communicated with one end of an elbow pipe, and the other end of the elbow pipe is bent and communicated with the discharge pipe of the third-stage preheating cyclone separator.

[0008] In use, the slag powder is conveyed into the first preheating cyclone separator, the second preheating cyclone separator and the third preheating cyclone separator in sequence through the distributor, and is finally roasted in the gaseous suspension roasting furnace, so that multi-stage preheating is realized, and complete preheating is ensured; meanwhile, 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 enters the gaseous suspension roasting furnace at the cross section, so that accumulation in the gaseous suspension roasting furnace is avoided, and uniform heating is ensured.

[0009] The slag powder collecting system comprises a bottom plate and a vertical pipe which is fixed vertically above the bottom plate and is rectangular, the left side and the right side of the vertical pipe are respectively communicated with the upper end of the air inlet pipe and the U-shaped pipe along the same transverse line, the other end of the air inlet pipe is communicated with the gas outlet of the first preheating cyclone separator and the second preheating cyclone separator, the lower end of the U-shaped pipe is communicated on the right side surface of the vertical pipe, the second filter pipe and the third filter pipe which are consistent in shape and are opposite to the air inlet pipe and the lower end of the U-shaped pipe respectively are arranged in the vertical pipe, the first filter pipe is arranged at equal intervals above the second filter pipe, the first filter pipe, the second filter pipe and the third filter pipe are fixedly connected through the connecting rod, the first magnet is fixedly connected to the front and rear side surfaces of the first filter pipe, the second filter pipe and the third filter pipe, and the small dust removal cloth bag which is coaxially arranged inside and has an opening facing left is arranged inside, the vertical pipe is blocked in the front and rear directions through the second filter pipe and the corresponding first magnet, and the iron sheet which is attached to the corresponding first magnet is inlaid in the inner wall of the vertical pipe; 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, the first magnet and the iron sheet are disconnected under the action of gravity when the third filter pipe is overloaded, the left side of the vertical pipe is also communicated with the air outlet pipe which is opposite to the third filter pipe, the air outlet pipe is vertically communicated with the upper air outlet main pipe, the upper air outlet main pipe is closed at both ends and is detachably fixedly connected with the branch air outlet pipe through the flange, the large dust removal cloth bag is detachably arranged in the branch air outlet pipe, the branch air outlet pipe is vertically and communicated with the lower air outlet main pipe which is closed at both ends, the air outlet end of the lower air outlet main pipe is communicated with the air inlet end of the desulfurization system, the upper air outlet main pipe is provided with the electromagnetic valve which controls the corresponding branch air outlet pipe, and the one-way valve which flows to the desulfurization system is communicated with the lower end of the branch air outlet pipe.

[0010] The slag powder collecting system, when in use, the first filter pipe, the second filter pipe and the third filter pipe are arranged vertically in the vertical pipe, wherein the flue gas with dust enters the second filter pipe through the air inlet pipe, and the dust is collected by the small dust removal cloth bag in the second filter pipe, and the filtered flue gas enters the upper end of the U-shaped pipe after the second filter pipe and is guided by the U-shaped pipe to blow back the small dust removal cloth bag in the third filter pipe, wherein when the dust in the small dust removal cloth bag in the second filter pipe is overloaded, under the action of gravity, the first filter pipe moves to the second filter pipe to filter the flue gas with dust, the second filter pipe moves to the third filter pipe and the dust enters the upper gas outlet main pipe through the air outlet pipe under the blowback of the flue gas and is collected in the large dust removal cloth bag in the corresponding branch air outlet pipe in the upper gas outlet main pipe, and the third filter pipe moves to the ground to play a supporting role, then the third filter pipe and the corresponding connecting rod are disassembled, the small dust removal cloth bag is cleaned again and placed in the original first filter pipe position, and the above steps are repeated, wherein the dust in the large dust removal cloth bag can be disassembled and poured out when a certain amount of dust is collected, specifically, the corresponding valve is closed, the gas flows into another branch air outlet pipe, flows from another branch air outlet pipe to the lower gas outlet main pipe, and flows from the lower gas outlet main pipe to the desulfurization system, and the closed branch air outlet pipe can be disassembled and the slag powder in the dust removal cloth bag can be collected.

[0011] As preferred, the first filter pipe, the second filter pipe and the third filter pipe are coaxially and fixedly provided with an inner pipe, the inner pipe is gap-fitted between the corresponding first filter pipe, the second filter pipe and the third filter pipe, a strip-shaped groove is formed in the side of the inner pipe, the small dust removal cloth bag is arranged in the inner pipe, opposite circular frames are arranged at the inner side end of the small dust removal cloth bag and in the inner pipe, a plurality of extrusion rods are uniformly and vertically connected to the inner side circular frame of the small dust removal cloth bag along the circumferential direction of the inner side circular frame, the circular frame in the inner pipe is fixedly arranged in the inner pipe, the small dust removal cloth bag is extruded and fixedly connected by the extrusion rods and the inner pipe, and a cross frame is fixedly connected in the circular frame. The cooperation of the inner pipe, the extrusion rods, the cross frame and the circular frame can realize the positioning of the small dust removal cloth bag and avoid the shaking of the small dust removal cloth bag.

[0012] As preferred, the arc-shaped scraper which is attached to the small dust removal cloth bag is arranged between the two adjacent extrusion rods, the inner wall of the arc-shaped scraper is vertically connected with a connecting rod, the connecting rod is connected to a circular plate, a silk hole is arranged on the circular plate, a screw rod is threadedly connected in the silk hole, a round rod is arranged at the front end of the screw rod, a fan blade is sleeved on the round rod, the round rod drives the screw rod to rotate through a transmission mechanism, and the round rod idles when rotating counterclockwise, a horizontal rod is vertically connected to any connecting rod, the horizontal rod penetrates through the inner tube and is located in the corresponding first filter pipe, second filter pipe and third filter pipe, and the rear end of the screw rod is rotatably connected to a cross frame; a fixed rod is fixedly arranged in the lower transverse pipe of the U-shaped pipe, a through hole is arranged on the fixed rod, a sliding rod penetrates through the through hole, and a second magnet and an iron rod are fixedly arranged at the opposite ends of the sliding rod, respectively, the outer end of the sliding rod is downwardly bent to form a vertical rod, a third magnet is connected to the lower end of the vertical rod, the vertical rod and the inner wall of the corresponding side of the U-shaped pipe are connected through a spring, the suction force of the first magnet and the iron sheet is greater than the elastic force of the spring and smaller than the total weight of the first filter pipe, second filter pipe and third filter pipe, a circular through groove is arranged on the left side of the bottom surface of the lower transverse pipe of the U-shaped pipe, the circular through groove is closed through a cover plate, the circular through groove and the lower gas outlet main pipe are communicated through a connecting gas outlet pipe, a one-way valve which circulates to the desulfurization system through the connecting gas outlet pipe is further arranged on the lower gas outlet main pipe, a second iron block is arranged on the cover plate, and the bottom surface of the third magnet and the top surface of the second iron block are located on the same horizontal surface; when the second iron block is opposite to the third magnet, the arc-shaped scraper is located at the leftmost side of the small dust removal cloth bag, and the spring is in a straightened state. The fan blade in the second filter pipe rotates counterclockwise under the action of the airflow, and then idles, and the fan blade in the third filter pipe rotates clockwise, the clockwise rotation of the fan blade drives the rotation of the screw rod, and the rotation of the screw rod drives the circular plate to rotate, wherein the circular plate is fixedly connected to the arc-shaped scraper, and the arc-shaped scraper can only move horizontally under the limitation of the extrusion rod, so the rotation of the screw rod drives the horizontal movement of the arc-shaped scraper, so as to scrape the inner wall of the small dust removal cloth bag, wherein the horizontal movement of the arc-shaped scraper drives the horizontal movement of the horizontal rod, the horizontal movement of the horizontal rod drives the horizontal movement of the sliding rod under the action of the suction force of the second magnet and the iron rod, the horizontal movement of the sliding rod lengthens the spring and drives the third magnet to move towards the second iron block, when the third magnet is located above the second iron block, the arc-shaped scraper moves to the leftmost side of the small dust removal cloth bag, wherein the second iron block drives the cover plate to be adsorbed on the third magnet, at this moment, since the airflow continues to flow to the third filter pipe, the airflow will pass through the small dust removal cloth bag in the third filter pipe and the large dust removal cloth bag, and the circular through groove has no resistance, so the airflow will flow through the circular through groove and enter the lower gas outlet main pipe through the connecting gas outlet pipe and then enter the desulfurization system for desulfurization, thereby causing the airflow to flow more smoothly, the blowing force when the branch gas outlet pipe is disassembled is smaller, and the arc-shaped scraper no longer moves. When the second filter pipe moves downwardly, the second magnet and the iron rod are disconnected, the spring drives the sliding rod to return to the initial position, the cover plate falls under the action of gravity, and when the second filter pipe falls to the third filter pipe, the horizontal rod in the second filter pipe continues to contact with the sliding rod, and the above-mentioned action is continued.

[0013] As preferred, the U-shaped pipe is provided with a limiting slot, a limiting rod is arranged in the limiting slot, the limiting rod is vertically connected with the cover plate, the upper part and the lower part of the lower transverse pipe of the U-shaped pipe are fixedly connected with fixed blocking plates, a movable blocking plate is fixedly arranged on the cross 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 surface and seal the lower transverse pipe of the U-shaped pipe. The limiting rod can ensure the vertical movement of the cover plate, and the fixed blocking plate not only can accelerate the airflow passing through the fixed blocking plate, but also can form a seal with the movable blocking plate, thereby better ensuring the airflow passing through the circular through slot.

[0014] As preferred, the transmission mechanism comprises a ratchet wheel fixedly sleeved on the round rod and an outer tube coaxially sleeved on the lead screw, the outer tube is hingedly connected with a ratchet pawl matched with the ratchet wheel, and the ratchet pawl and the outer tube are fixedly connected by a spring. The cooperation of the ratchet wheel and the ratchet pawl can ensure that the round rod rotates clockwise to drive the lead screw to rotate through the outer tube, and the round rod rotates counterclockwise to idle.

[0015] As preferred, the upper end of the vertical pipe is sealed by a detachable sealing cover, which can prevent gas from overflowing through the upper part of the vertical pipe.

[0016] As preferred, the U-shaped pipe is fixedly connected with the upper end of the support rod, and the lower end of the support rod is vertically connected to the top surface of the bottom plate.

[0017] As preferred, the top surface and the bottom surface of the first filter pipe, the second filter pipe and the third filter pipe are vertically provided with blind holes, and the first electromagnet is fixedly arranged in the blind hole, and the first iron block is fixedly arranged at the two ends of the connecting rod and is attracted to the first electromagnet. The first electromagnet and the first iron block are attracted to each other, which can ensure that the connecting rod is connected with the corresponding first filter pipe, second filter pipe and third filter pipe when the first electromagnet generates an attractive force, and the connecting rod can be separated from the first filter pipe, second filter pipe and third filter pipe when the power is off.

[0018] The application has the beneficial effects that: through the use of the application, the slag powder is conveyed into a first preheating cyclone separator, a second preheating cyclone separator and a third preheating cyclone separator in sequence after preheating, and finally into a gaseous suspension roasting furnace for roasting, so that multi-stage preheating is realized, which 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, when the rotary disc rotates, the side plate rotates, and the slag powder on the rotary disc is scattered and scattered into the gaseous suspension roasting furnace at the cross section, avoiding accumulation in the gaseous suspension roasting furnace, and ensuring more uniform heating. At the same time, under the premise of collecting dust through the first filter pipe, the second filter pipe and the third filter pipe, when the dust collection is overloaded, the small dust removal cloth bag can be automatically moved downward and replaced, and the gas back pressure can be used to blow the small dust removal cloth bag full of dust into the large dust removal cloth bag under the action of the gas back pressure, thereby realizing automatic collection of dust, which not only saves the time and physical strength of workers in disassembling the dust removal cloth bag, but also greatly improves the work efficiency because of no need to stop. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0020] Figure 1 is a process flow diagram of the present application; Figure 2 is a tail gas treatment system structure schematic diagram; Figure 3 is an arc-shaped scraper distribution schematic diagram; Figure 4 is a ratchet pawl cooperation schematic diagram; Figure 5 is an A direction schematic diagram of Figure 2 ; Figure 6 is an I partial enlarged view of Figure 2 ; Figure 7 is a II partial enlarged view of Figure 2 ; Figure 8 is a bulk material device structure schematic diagram; Figure 9 is a B direction structure schematic diagram of Figure 8 .

[0021] The drawings show: 1, vertical pipe, 2, air inlet pipe, 3, U-shaped pipe, 4, first filter pipe, 5, second filter pipe, 6, third filter pipe, 7, small dust cloth bag, 8, first magnet, 9, iron sheet, 10, connecting rod, 11, large dust cloth bag, 12, air outlet pipe, 13, inner pipe, 14, extrusion rod, 15, cross frame, 16, arc-shaped scraper, 17, screw rod, 18, round rod, 19, fan blade, 20, sliding rod, 21, cross rod, 22, second magnet, 23, third magnet, 24, spring, 25, limiting rod, 26, fixed blocking plate, 27, moving blocking plate, 28, outer pipe, 29, pawl, 30, ratchet wheel, 31, first electromagnet, 32, elbow pipe, 33, rotary motor, 34, rotary disc, 35, disc, 36, side plate, 37, upper air outlet main pipe, 38, branch air outlet pipe, 39, lower air outlet main pipe, 40, denitration system, 41, desulfurization system, H1, first-stage preheating cyclone separator, H2, second-stage preheating cyclone separator, H3, third-stage preheating cyclone separator, H4, gaseous suspension calcination furnace, A1, distributor. DETAILED DESCRIPTION

[0022] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0023] The slag powder suspension calcination production process is, for example, Figures 1-9The shown. Including cyclone preheating system, calcination system, finished product cooling system and tail gas treatment system, characterized by: the cyclone preheating system includes a first preheating cyclone separator H1, a second preheating cyclone separator H2 and a third preheating cyclone separator H3 arranged from top to bottom; The calcination system includes a gaseous suspension calcination furnace H4, the material is fed into the air inlet pipe of the first preheating cyclone separator H1 through the distributor A1, the gas separated in the second preheating cyclone separator H2 is discharged and enters the air inlet pipe of the first preheating cyclone separator H1, the gas separated in the first preheating cyclone separator H1 enters the tail gas treatment system, and after collecting the slag in the slag collection system, it enters the denitrification system 40 for denitrification and then enters the desulfurization system 41 for desulfurization; The material preheated from the first preheating cyclone separator H1 is fed into the air inlet pipe of the second preheating cyclone separator H2 through the discharge pipe, and the gas separated in the third preheating cyclone separator H3 is discharged and enters the air inlet pipe of the second preheating cyclone separator H2, the material preheated from the second preheating cyclone separator H2 is fed into the air inlet pipe of the third preheating cyclone separator H3 through the discharge pipe, the high temperature gas from the gaseous suspension calcination furnace H4 enters the air inlet pipe of the third preheating cyclone separator H3, and the material preheated in the third preheating cyclone separator H3 enters the gaseous suspension calcination furnace H4 through the bulk material device, and the material in the gaseous suspension calcination furnace H4 enters the finished product cooling system; The bulk material device includes a hollow and closed disc 35, the right side of the disc 35 is a flat cut section, and the disc 35 is embedded in the side wall of the gaseous suspension calcination furnace H4 at the section and communicates with the inside of the gaseous suspension calcination, the disc 35 is adapted with a rotating disc 34 with the same outer diameter as the inner diameter of the disc 35, the outer edge of the rotating disc 34 penetrates the section and is located in the gaseous suspension calcination furnace H4, the bulk material device includes a hollow and closed disc 35, the right side of the disc 35 is a flat cut section, and the disc 35 is embedded in the side wall of the gaseous suspension calcination furnace H4 at the section and communicates with the inside of the gaseous suspension calcination, the disc 35 is adapted with a rotating disc 34 with the same outer diameter as the inner diameter of the disc 35, the outer edge of the rotating disc 34 penetrates the section and is located in the gaseous suspension calcination furnace H4, the rotating disc 34 top surface is vertically connected with several side plates 36 intersecting with the center of the disc 35 along the circumference, the intersection of the side plate 36 is vertically connected with a rotating shaft upward, the rotating shaft penetrates the disc 35 and is coaxially fixedly connected with the rotating shaft of the rotating motor 33 fixedly arranged on the outer side wall of the gaseous suspension calcination furnace H4, the disc 35 top surface is downwardly provided with a feed inlet, the feed inlet is upwardly communicated with one end of the elbow pipe 32, the other end of the elbow pipe 32 is bent and communicated with the discharge pipe of the third preheating cyclone separator.

[0024] In use, the slag powder is conveyed into the first preheating cyclone H1, the second preheating cyclone H2 and the third preheating cyclone H3 in turn through the distributor A1, preheated and finally roasted in the gaseous suspension roaster H4, thereby realizing multi-stage preheating and ensuring complete preheating. Meanwhile, the preheated slag powder enters the rotary disc 34 through the elbow pipe 32, the rotary disc 34 rotates under the drive of the rotary motor 33, the rotary disc 34 drives the side plate 36 to rotate when rotating, thereby driving the slag powder on the rotary disc 34 to scatter and enter the gaseous suspension roaster H4 at the cross section, avoiding accumulation in the gaseous suspension roaster H4 and ensuring more uniform heating.

[0025] The tail gas treatment system comprises a slag collecting system, a denitration system 40 adopting ammonia water denitration and a desulfurization system 41 adopting limestone-gypsum method desulfurization. The slag collecting system comprises a bottom plate and a vertical pipe 1 fixedly arranged above the bottom plate in a rectangular shape. The left side and the right side of the vertical pipe 1 are respectively communicated with the upper end of an air inlet pipe 2 and a U-shaped pipe 3 along the same transverse line. The other end of the air inlet pipe 2 is communicated with the air outlet of a first-stage preheating cyclone separator H1. The lower end of the U-shaped pipe 3 is communicated on the right side surface of the vertical pipe 1. Second and third filter pipes 5 and 6 with the same shape are arranged in the vertical pipe 1 and respectively opposite to the lower end of the air inlet pipe 2 and the U-shaped pipe 3. First filter pipes 4 are equidistantly arranged above the second filter pipe 5. The first, second and third filter pipes 4, 5 and 6 are detachably fixedly connected through connecting rods 10. The first, second and third filter pipes 4, 5 and 6 are fixedly connected with first magnets 8 on the front and back side surfaces and coaxially fixedly arranged with small dust removal cloth bags 7 with openings facing left inside. Specifically, inner pipes 13 are coaxially and fixedly arranged in the first, second and third filter pipes 4, 5 and 6. The inner pipes 13 are connected and communicated with the corresponding first, second and third filter pipes 4, 5 and 6 through tapered pipes. The inner pipes 13 are gap-fitted with the corresponding first, second and third filter pipes 4, 5 and 6. Strip-shaped grooves are formed on the side surface of the inner pipes 13. The small dust removal cloth bags 7 are arranged in the inner pipes 13. Circular frames are fixedly arranged in the inner pipes 13 and the small dust removal cloth bags. The inner side end of the small dust removal cloth bag 7 is supported by the circular frame. A plurality of extrusion rods 14 are vertically and uniformly connected with the circular frame in the small dust removal cloth bag 7 along the circumferential direction. The small dust removal cloth bag 7 is extruded and fixedly connected with the inner pipe 13 through the extrusion rods 14. Cross frames 15 are fixedly connected in the circular frame. The vertical pipe 1 is blocked in the front and back directions by the second filter pipe 5 and the corresponding first magnet 8. Iron sheets 9 are inlaid on the inner wall of the vertical pipe 1 and abut against the corresponding first magnet 8. The spacing between the third filter pipe 6 and the bottom plate is the sum of the vertical length 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 are disconnected under the action of gravity. The left side of the vertical pipe 1 is further communicated with an air outlet pipe 12 opposite to the third filter pipe 6. The air outlet pipe is vertically communicated with an upper air outlet main pipe 37. The upper air outlet main pipe 37 is closed at both ends and detachably fixedly connected with branch air outlet pipes 38 through flanges. Large dust removal cloth bags are detachably arranged in the branch air outlet pipes 38. The branch air outlet pipes 38 are vertically and communicated with lower air outlet main pipes 39 which are closed at both ends. The air outlet end of the lower air outlet main pipe 39 is communicated with the air inlet end of the denitration system 40. The upper air outlet main pipe 37 is provided with electromagnetic valves for controlling the corresponding branch air outlet pipes 38. The lower end of the branch air outlet pipe 38 is communicated with a one-way valve flowing towards the denitration system 40.

[0026] The arc-shaped scraper 16 is provided between two adjacent extrusion rods 14 and is attached to the small dust removal cloth bag 7. The inner wall of the arc-shaped scraper 16 is vertically connected with a connecting rod 10. The connecting rod 10 is connected to a circular plate. The circular plate is provided with a screw hole. A screw rod 17 is threadedly connected in the screw hole. The rear end of the screw rod 17 is coaxially fixedly connected with a circular shaft. The circular shaft is provided with a through hole. The circular shaft passes through the through hole and is rotatably connected with the through hole through a bearing. The front side of the screw rod 17 is provided with a circular rod 18. The circular rod 18 is sleeved with a fan blade 19. The circular rod 18 drives the screw rod 17 to rotate through a transmission mechanism. When the circular rod 18 rotates counterclockwise, it idles with the screw rod 17. The connecting rod 10 is vertically connected with a cross rod 21. The cross 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 fixed rod is fixedly arranged in the lower transverse pipe of the U-shaped pipe 3. The fixed rod is provided with a through hole. A sliding rod 20 passes through the through hole. The opposite ends of the sliding rod 20 are fixedly provided with a second magnet 22 and an iron rod, respectively. The outer end of the sliding rod 20 is downwardly bent with a vertical rod. The lower end of the vertical rod is connected with a third magnet 23. The vertical rod and the inner wall of the corresponding side of the U-shaped pipe 3 are connected through a spring 24. The attractive force of 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. The left side of the bottom surface of the lower transverse pipe of the U-shaped pipe 3 is downwardly provided with a circular through slot. The circular through slot is closed through a cover plate. The cover plate is provided with a second iron block. The bottom surface of the third magnet 23 and the top surface of the second iron block are located on the same horizontal surface. When the second iron block and the third magnet 23 are opposite to each other, the arc-shaped scraper 16 is located at the leftmost side of the small dust removal cloth bag 7. The spring 24 is in a straightened state.

[0027] The inner tube 13, the extrusion rod 14, the cross frame 15 and the circular frame jointly limit the small dust removal cloth bag 7, so that the small dust removal cloth bag 7 is prevented from shaking.

[0028] In use, the first filter pipe 4, the second filter pipe 5 and the third filter pipe 6 are arranged vertically in the vertical pipe 1, wherein the flue gas with dust enters the second filter pipe 5 through the air inlet pipe 2 and the dust is collected by the small dust removal cloth bag 7 in the second filter pipe 5, and the filtered flue gas enters the upper end of the U-shaped pipe 3 after the second filter pipe 5 and is guided by the U-shaped pipe 3 to blow back the small dust removal cloth bag 7 in the third filter pipe 6, wherein when the dust in the small dust removal cloth bag 7 in the second filter pipe 5 is overloaded, under the action of gravity, the first filter pipe 4 moves to the second filter pipe 5 to filter the flue gas with dust, the second filter pipe 5 moves to the third filter pipe 6 and the dust enters the upper air outlet main pipe 37 under the blowback of the flue gas and enters the large dust removal cloth bag in the corresponding branch air outlet pipe 38 in the upper air outlet main pipe 37 to be collected, and the third filter pipe moves to the ground to support, then the third filter pipe and the corresponding connecting rod are disassembled and the small dust removal cloth bag is cleaned twice and placed in the original first filter pipe position, and the cycle is used in turn, wherein the dust in the large dust removal cloth bag 11 can be disassembled and poured out when a certain amount of dust is collected, specifically, the corresponding valve is closed, the gas flows into another branch air outlet pipe 38, flows from another branch air outlet pipe 38 to the lower air outlet main pipe 39, and flows from the lower air outlet main pipe 39 to the denitration system 40, and the closed branch air outlet pipe 38 can be disassembled and the slag powder in the dust removal cloth bag is collected, and the third filter pipe 6 moves to the ground to support, then the third filter pipe 6 and the corresponding connecting rod 10 are disassembled and the small dust removal cloth bag 7 is cleaned twice and placed in the original first filter pipe 4 position, and the cycle is used in turn.

[0029] The fan blades 19 in the second filter pipe 5 rotate counterclockwise under the action of the airflow, and the fan blades 19 in the third filter pipe 6 rotate clockwise. The clockwise rotation of the fan blades 19 drives the rotation of the lead screw 17, and the rotation of the lead screw 17 drives the rotation of the circular plate. The circular plate is fixedly connected with the arc-shaped scraper 16, and the arc-shaped scraper 16 can only move horizontally under the limitation of the extrusion rod 14. Therefore, the rotation of the lead screw 17 drives the horizontal movement of the arc-shaped scraper 16, thereby achieving scraping of the inner wall of the small dust cloth bag 7. The horizontal movement of the arc-shaped scraper 16 drives the horizontal movement of the cross rod 21, and the horizontal movement of the cross rod 21 drives the horizontal movement of the sliding rod 20 under the action of the attraction of the second magnet 22 and the iron rod. The horizontal movement of the sliding rod 20 elongates the spring 24 and drives the third magnet 23 to move 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 cloth bag 7. The second iron block drives the cover plate to be attracted to the third magnet 23. At this moment, since the airflow continues to flow into the third filter pipe 6, it will pass through the small dust cloth bag 7 in the third filter pipe 6 and the large dust cloth bag 11, and the resistance of the large dust cloth bag 11 is large, while there is no resistance at the circular through slot. Therefore, the airflow will flow through the circular through slot, thereby making the airflow flow more smoothly, and the blowing force received when the large dust cloth bag 11 is removed is smaller, and the arc-shaped scraper 16 no longer moves. When the second filter pipe 5 moves downward, the second magnet 22 is disconnected from the iron rod, the spring 24 pulls the sliding rod 20 back to the initial position, and the cover plate falls under the action of gravity. When the second filter pipe 5 falls to the third filter pipe 6, the cross rod 21 in the second filter pipe 5 continues to contact the sliding rod 20, and the above-mentioned action continues. After the third filter pipe falls, the circular shaft rotates the lead screw 17 in the opposite direction, so that the arc-shaped scraper 16 and the cross rod return to the initial position. In order to facilitate the rotation of the lead screw 17, a rotating handle is installed at the end of the circular shaft.

[0030] The U-shaped pipe 3 is provided with a limiting slot, and a limiting rod 25 is arranged in the limiting slot. The limiting rod 25 is connected with the cover plate perpendicularly. The upper part and the lower part of the lower transverse pipe of the U-shaped pipe 3 are fixedly connected with a fixed blocking plate 26. The cross rod 21 is fixedly provided with a moving blocking plate 27. When the second iron block is opposite to the third magnet 23, the fixed blocking plate 26 and the moving blocking plate 27 are located on the same vertical surface and seal the lower transverse pipe of the U-shaped pipe 3. The limiting rod 25 can ensure the vertical movement of the cover plate, and the fixed blocking plate 26 not only can accelerate the airflow passing through the fixed blocking plate 26, but also can form a seal with the moving blocking plate 27, thereby better ensuring that the airflow passes through the circular through slot.

[0031] The transmission mechanism comprises a ratchet wheel 30 fixedly sleeved on the round rod 18 and an outer tube 28 coaxially sleeved on the lead screw 17, the outer tube 28 is hingedly connected with a pawl 29 matched with the ratchet wheel 30, and the pawl 29 is fixedly connected with the outer tube 28 through the spring 24. The matching of the ratchet wheel 30 and the pawl 29 can ensure that the round rod 18 drives the lead screw 17 to rotate through the outer tube 28 when the round rod 18 rotates clockwise, and the round rod 18 idles when the round rod 18 rotates counterclockwise.

[0032] The upper end of the vertical pipe 1 is sealed by a detachable sealing cover, so that gas overflow through the upper part of the vertical pipe 1 can be avoided.

[0033] The upper end of the U-shaped pipe 3 is fixedly connected with a support rod, and the lower end of the support rod is vertically connected to the top surface of the bottom plate.

[0034] The top surface and the bottom surface of the first filter pipe 4, the second filter pipe 5 and the third filter pipe 6 are vertically provided with blind holes, and a first electromagnet 31 is fixedly arranged in the blind hole, and a first iron block which is attracted to the first electromagnet 31 is fixedly arranged at both ends of the connecting rod 10. The first electromagnet 31 is attracted to the first iron block, so that when needed, the first electromagnet 31 can generate an attractive force to ensure that the connecting rod 10 is connected to the corresponding first filter pipe 4, second filter pipe 5 and third filter pipe 6, and when needed, the power is cut off to facilitate the disconnection of the connecting rod 10 from the first filter pipe 4, second filter pipe 5 and third filter pipe 6.

[0035] In use, the slag powder is conveyed into the first preheating cyclone separator, the second preheating cyclone separator and the third preheating cyclone separator in sequence through the distributor, is preheated in the last gaseous suspension roasting furnace, thereby realizing multi-stage preheating, ensuring complete preheating, and entering the rotating disc through the elbow pipe after preheating, the rotating disc rotates under the driving of the rotating motor, the rotating disc rotates to drive the side plate to rotate, thereby driving the slag powder on the rotating disc to spread and scatter into the gaseous suspension roasting furnace at the cross section, avoiding accumulation in the gaseous suspension roasting furnace and ensuring more uniform heating. Under the premise of collecting dust through the first filter pipe, the second filter pipe and the third filter pipe, when the dust collection is overloaded, the small dust removal cloth bag can be automatically moved downward and replaced, and the small dust removal cloth bag full of dust can be blown into the large dust removal cloth bag under the action of the gas back pressure, thereby realizing automatic dust collection, saving the time and physical strength of workers in disassembling the dust removal cloth bag, and greatly improving the work efficiency without stopping.

[0036] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A process for the production of slag powder by suspension calcination, comprising a preheating system by cyclone, a calcination system, a cooling system of the finished product and a system for the treatment of the exhaust gases, characterized in that: The cyclone preheating system comprises a first-stage preheating cyclone separator, a second-stage preheating cyclone separator and a third-stage preheating cyclone separator arranged in sequence from top to bottom; the calcining system comprises a gaseous suspension calcining furnace; the material is fed into the air inlet pipe of the first-stage preheating cyclone separator through the distributor; the gas separated in the second-stage preheating cyclone separator is discharged and enters the air inlet pipe of the first-stage preheating cyclone separator; the gas separated in the first-stage preheating cyclone separator enters the tail gas treatment system; the material preheated in the first-stage preheating cyclone separator is fed into the air inlet pipe of the second-stage preheating cyclone separator through the downpipe and the gas separated in the third-stage preheating cyclone separator is discharged and enters the air inlet pipe of the second-stage preheating cyclone separator; the material preheated in the second-stage preheating cyclone separator is fed into the air inlet pipe of the third-stage preheating cyclone separator through the downpipe; the high-temperature gas from the gaseous suspension calcining furnace enters the air inlet pipe of the third-stage preheating cyclone separator; and the material preheated in the third-stage preheating cyclone separator enters the gaseous suspension calcining furnace through the bulk material device; and the material in the gaseous suspension calcining furnace enters the finished product cooling system; the tail gas treatment system comprises a slag powder collecting system, a denitration system and a desulfurization system; the gas separated in the first-stage preheating cyclone separator enters the slag powder collecting system in sequence to collect the slag powder and then enters the denitration system to be denitrified and finally enters the desulfurization system to be desulfurized; the denitration system adopts ammonia water denitration; and the desulfurization system adopts the limestone-gypsum method.

2. The process for the production of slag powder by suspension calcination according to claim 1, characterized in that: The bulk material device comprises a hollow and closed disc, the right side of the disc is a flat-cut section, the disc section is inlaid in the side wall of the gaseous suspension calcining furnace and communicates with the inside of the gaseous suspension calcining furnace, the disc is matched with a rotating disc with an outer diameter consistent with the inner diameter of the disc, the outer side edge of the rotating disc penetrates through the section and is located in the gaseous suspension calcining furnace, the rotating disc top surface is vertically connected with a plurality of side plates intersecting at the inner end and the disc center along the circumferential direction, the side plate intersection is vertically connected with a rotating shaft upward, the rotating shaft penetrates through the disc and is coaxially fixedly connected with the rotating motor shaft fixedly arranged on the outside wall of the gaseous suspension calcining furnace, the disc top surface is downwardly provided with a feeding port, the feeding port is upwardly communicated with one end of an elbow pipe, the other end of the elbow pipe is bent and communicated with the discharge pipe of the third-stage preheating cyclone separator.

3. The process for the production of slag powder by suspension calcination according to claim 2, characterized in that: The slag powder collecting system comprises a bottom plate and a vertical pipe fixedly arranged above the bottom plate and in a rectangular shape, the left side and the right side of the vertical pipe are communicated with the upper end of an air inlet pipe and a U-shaped pipe along the same transverse line respectively, the other end of the air inlet pipe is communicated with the air outlet of a first-stage preheating cyclone separator and a second-stage preheating cyclone separator, the lower end of the U-shaped pipe is communicated on the right side surface of the vertical pipe, the second filter pipe and the third filter pipe which are in the same shape and opposite to the lower end of the air inlet pipe and the U-shaped pipe are arranged in the vertical pipe, the first filter pipe is arranged above the second filter pipe at equal intervals, the first filter pipe, the second filter pipe and the third filter pipe are fixedly connected through the connecting rod, the first magnet is fixedly connected to the front and rear side surfaces of the first filter pipe, the second filter pipe and the third filter pipe, and the small dust removal cloth bag is coaxially fixedly arranged in the first magnet and opens to the left, the vertical pipe is blocked in the front and rear directions through the second filter pipe and the corresponding first magnet, the iron sheet is inlaid on the inner wall of the vertical pipe and is attached to 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, the first magnet and the iron sheet are disconnected under the action of gravity when the third filter pipe is overloaded, the left side of the vertical pipe is further communicated with the air outlet pipe opposite to the third filter pipe, the air outlet pipe is vertically communicated with the upper air outlet main pipe, the upper air outlet main pipe is closed at both ends and is detachably fixedly connected with the branch air outlet pipe through the flange, the large dust removal cloth bag is detachably arranged in the branch air outlet pipe, the branch air outlet pipe is vertically and communicated with the lower air outlet main pipe which is closed at both ends, the air outlet end of the lower air outlet main pipe is communicated with the air inlet end of the desulfurization system, the upper air outlet main pipe is provided with the electromagnetic valve for controlling the corresponding branch air outlet pipe, and the one-way valve flowing to the desulfurization system is communicated with the lower end of the branch air outlet pipe.

4. The process for the production of slag powder by suspension calcination according to claim 3, characterized in that: The inner pipe is coaxially and fixedly arranged in the first filter pipe, the second filter pipe and the third filter pipe, the inner pipe is matched with the corresponding first filter pipe, the second filter pipe and the third filter pipe through the gap, the strip-shaped groove is arranged on the side surface of the inner pipe, the small dust removal cloth bag is arranged in the inner pipe, the opposite circular frames are arranged on the inner side end of the small dust removal cloth bag and in the inner pipe, a plurality of extrusion rods are uniformly and vertically connected to the circular frame on the inner side of the small dust removal cloth bag along the circumferential direction of the circular frame, the circular frame is fixedly arranged in the inner pipe, the small dust removal cloth bag is extruded and fixedly connected through the extrusion rod and the inner pipe, and the cross frame is fixedly connected in the circular frame.

5. The process for the production of slag powder by suspension calcination according to claim 4, characterized in that: The arc-shaped scraper is vertically connected with a connecting rod in the inner wall of the arc-shaped scraper, the connecting rod is connected with a circular plate, a silk hole is formed in the circular plate, a screw rod is threadedly connected in the silk hole, a circular rod is arranged at the front end of the screw rod, a fan blade is sleeved on the circular rod, the circular rod is driven to rotate by the transmission mechanism, and the circular rod idles when rotating counterclockwise with the screw rod, a horizontal rod is vertically connected to any connecting rod, the horizontal rod penetrates through the inner tube and is located in the corresponding first filter pipe, second filter pipe and third filter pipe, and the rear end of the screw rod is rotatably connected to a cross frame.

6. The process for the production of slag powder by suspension calcination according to claim 5, characterized in that: A limiting slot is formed in the U-shaped tube, a limiting rod is arranged in the limiting slot in a matched mode, the limiting rod is vertically connected with the cover plate, the upper portion and the lower portion of the lower transverse tube of the U-shaped tube are fixedly connected with a fixed blocking plate, a movable blocking plate is fixedly arranged on the horizontal rod, 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 surface and seal the lower transverse tube of the U-shaped tube.

7. The process for the production of slag powder by suspension calcination according to claim 6, characterized in that: The transmission mechanism comprises a ratchet wheel fixedly sleeved on the circular rod and an outer tube coaxially sleeved on the screw rod, a ratchet pawl matched with the ratchet wheel is hinged in the outer tube, and the ratchet pawl and the outer tube are fixedly connected by a spring.

8. The process for the production of slag powder by suspension calcination according to claim 3, characterized in that: The upper end of the vertical pipe is sealed by a detachably arranged sealing cover.

9. The process for the production of slag powder by suspension calcination according to claim 3, characterized in that: The U-shaped tube is fixedly connected with the upper end of a supporting rod, and the lower end of the supporting rod is vertically connected to the top surface of the bottom plate.

10. The process for production of slag powder by suspension calcination according to claim 3, characterized in that: Blind holes are vertically formed in the top surface and the bottom surface of the first filter pipe, the second filter pipe and the third filter pipe, a first electromagnet is fixedly arranged in the blind hole, and first iron blocks that are attracted to the first electromagnet are fixedly arranged at both ends of the connecting rod.

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