A dryer and a sulfate removal process including the dryer

Abstract

This invention relates to the field of dryer technology, and discloses a dryer and a sulfate removal process including the dryer, comprising a tank assembly, a power assembly arranged on the central axis of the tank assembly, a feed hopper at the top of the tank assembly, a stirring assembly and a blocking block inside the feed hopper, a drying assembly inside the tank assembly, a turning assembly and a crushing assembly evenly arranged on the power assembly, a cleaning assembly on the turning assembly, a discharge port at the bottom of the tank assembly, and a sieve plate evenly arranged on the drying assembly. In this invention, the turning assembly continuously turns the crystals on the drying assembly, enabling uniform heat exchange and rapid drying of the crystals. The sieve plate separates agglomerated crystals from loose crystals, and the crushing assembly further crushes the agglomerated crystals, preventing the mixing and packaging of agglomerated and loose crystals.

Description

Technical Field

[0001] This invention relates to the field of dryer technology, and in particular to a dryer and a sulfate removal process comprising the dryer. Background Technology

[0002] The disc continuous dryer is a highly efficient conductive continuous drying equipment. Its unique structure and working principle determine that it has the characteristics of high thermal efficiency, low energy consumption, small footprint, simple configuration, convenient operation and control, and good operating environment. Wet material is continuously fed onto the first drying disc at the top of the dryer by the feeder, and the rake arm with rake blades rotates to continuously turn the material.

[0003] Chinese invention patent application number 202110662404.7 discloses a disc dryer, including a shell, a rotating shaft inside the shell, an array of first heating discs on the rotating shaft, an array of second heating discs on the rotating shaft, a hopper on the shell, an exhaust fan on the shell, a rake arm on the first heating disc, rake blades on the rake arm, the first heating disc comprising multiple sector-shaped discs, an inner vertical cylinder on the first heating disc connected to the sector-shaped discs, an inlet on one side of the sector-shaped discs, and an outlet on the other side. In this practical disc dryer, the heating disc is divided into multiple small sector-shaped discs, with arc-shaped plates and blocks arranged within the small sector-shaped discs, forming a flow chamber within the heating disc, reducing thermal stress on the heating disc and protecting the disc surface.

[0004] However, in this existing technology, it is impossible to separate and crush the clumps formed by water seepage in the material during the drying process. If the clumps are not crushed in time, they will be mixed with the dried material and packaged together later. The moisture seepage will cause more crystals to stick together, thus affecting the quality of the material. In addition, since the material itself has a certain degree of moisture, it may also stick to the rake blade during the turning process, resulting in material waste and affecting the turning effect of the rake blade.

[0005] Therefore, it is necessary to solve the above problems with a dryer. Summary of the Invention

[0006] The purpose of this invention is to provide a dryer and a sulfate removal process comprising the dryer, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a dryer, comprising a tank assembly, a power assembly disposed on the central axis of the tank assembly, a feed hopper disposed on the top of the tank assembly, a stirring assembly and a blocking block disposed inside the feed hopper, a drying assembly disposed inside the tank assembly, a turning assembly and a crushing assembly evenly disposed on the power assembly, a cleaning assembly disposed on the turning assembly, a discharge port disposed at the bottom of the tank assembly, an exhaust port disposed at the top of the tank assembly, and a sieve plate evenly disposed on the drying assembly;

[0008] The turning assembly includes a fixed plate, a rake rod is provided on one side of the fixed plate, movable plates are evenly provided on the rake rod, a rake blade is rotatably connected to the end of the movable plate, and a humidity sensor is provided on the rake blade;

[0009] The compaction assembly includes a compaction wheel, a bending support plate is provided on the compaction wheel, a lifting column is provided on the top of the bending support plate, and a compaction spring is provided on the outside of the lifting column.

[0010] Preferably, the cleaning assembly includes a parallel scraper, which is slidably mounted on a rake blade. A permanent magnet plate is fixedly mounted on the top of the parallel scraper, and a strip electromagnet is fixedly mounted on the top of the rake blade.

[0011] A support spring is provided at the end of the rake rod away from the fixed plate. One end of the support spring is fixedly connected to the movable plate that is furthest from the fixed plate. A movable electromagnet is fixedly provided on the movable plate.

[0012] Preferably, the compaction assembly is arranged symmetrically about the central axis of the tank assembly to form a compaction layer. The compaction layer is evenly spaced. A support plate is fixedly mounted on the fixed plate. The lifting column passes through the support plate. One end of the compaction spring is fixedly mounted on the bent support plate, and the other end is fixedly mounted on the support plate. The compaction wheel is closely attached to the screen plate.

[0013] Preferably, the drying assembly includes a drying plate and a drying tray, which are interleaved. Both sides of the drying plate and the drying tray are provided with flow pipes communicating with them. A straight pipe is fixedly provided at the other end of the flow pipe. One of the straight pipes is provided with a liquid inlet, and the other straight pipe is provided with a liquid outlet. The straight pipe is fixedly provided inside the tank assembly by a fixing ring.

[0014] Preferably, the power assembly includes a rotating shaft, a motor is fixedly mounted at the bottom end of the rotating shaft, and a deep groove is formed at the top end of the rotating shaft;

[0015] The drying plate is rotatably mounted on a rotating shaft. A circular hole is provided in the center of the drying tray. The diameter of the circular hole is larger than the diameter of the rotating shaft. The rotating shaft passes through the circular hole and does not contact the drying tray.

[0016] Preferably, the stirring assembly includes a stirring shaft, the bottom end of which is slidably disposed in a deep groove, the blockage block is fixedly disposed on the stirring shaft, stirring blades are fixedly disposed on the stirring shaft, a telescopic cylinder is fixedly connected to the top end of the stirring shaft, support columns are evenly disposed on the feed hopper, a limit plate is fixedly disposed on the support columns, and the telescopic cylinder is rotatably disposed on the central axis of the limit plate.

[0017] Preferably, the tank assembly includes a drying tank, the top plate of the drying tank is provided with an exhaust port, the bottom plate of the drying tank is provided with an inclined plate, the lowest point of the inclined plate is provided with a through hole, the bottom plate of the drying tank is provided with a discharge port, the discharge port is provided corresponding to the through hole, the feed hopper is fixedly provided at the center of the top plate and extends into the drying tank, and the bottom plate is uniformly provided with supporting columns.

[0018] A sulfate removal process, comprising a dryer as described above, includes the following steps:

[0019] Step 1: Fix SO. The SO gas generated during the production process is passed into the desulfurization circulation tank. The deoxygenation circulation liquid absorbs SO to form NaSO. NaSO accumulates until it is near saturation.

[0020] Step 2: NaSO precipitates. Air is introduced into the circulating slurry through an oxidation blower to oxidize NaSO into NaSO. The temperature of the deoxygenated circulating liquid is then reduced to a certain degree by a chiller, causing NaSO to crystallize and precipitate.

[0021] Step 3: Separate NaSO crystals. The circulating liquid containing NaSO crystals is pumped into a hydrocyclone using an ammonium sulfate pump. The slurry containing crystals is separated in the hydrocyclone under the action of centrifugal force. The clear liquid at the top overflows back to the circulating slurry tank, while the turbid liquid at the bottom enters a centrifuge for further separation.

[0022] Step 4: Further separate the NaSO crystals. The lower turbid liquid is further separated in a centrifuge under the action of centrifugal force. The liquid is returned to the circulating slurry tank, and the solid flows by gravity to the dryer.

[0023] Step 5: Dry the NaSO crystals. Heat transfer oil is introduced into the drying components of the dryer to dry the NaSO containing moisture. The dried NaSO is scraped to the discharge port by the turning component.

[0024] Step 6: Pack NaSO crystals. The dried NaSO crystals are transported to a semi-automatic packaging machine and packaged into bags.

[0025] Step five includes the following steps:

[0026] Step a: Preheat the drying assembly by introducing heat transfer oil to maintain a uniform temperature inside the tank assembly;

[0027] Step b: Put the crystals to be dried into the feed hopper. The stirring component drives the blockage block to rise and fall to open the feed port, so that the crystals fall onto the drying component for drying.

[0028] Step c: The turning component scrapes the crystals from the drying component to the bottom of the tank component, and the dried crystals are discharged from the outlet.

[0029] Step d: The water vapor generated during drying is extracted from the exhaust port.

[0030] The technical effects and advantages of this invention are as follows:

[0031] 1. In this invention, a turning component is set to continuously turn the crystals on the drying component, so that the crystals can exchange heat evenly and dry quickly. A sieve plate is set to separate the agglomerated crystals from the loose crystals. Then, a crushing component is used to crush the agglomerated crystals, so as to avoid the mixed packaging of agglomerated and loose crystals. The moisture inside the agglomerated crystals will evaporate and cause water vapor to be generated in the packaging bag, which will affect the quality of the loose crystals.

[0032] 2. In this invention, a humidity sensor is set to detect the humidity of the crystals. At the same time, it can identify in time whether there are blocky crystals adhering to the current rake blade, thereby controlling the cleaning component to clean the rake blade, preventing crystals from adhering to the rake blade, affecting the recognition of the humidity sensor, and preventing excessive crystal adhesion from affecting the crystal drying efficiency.

[0033] 3. In this invention, a sieve plate is set to separate and screen the loose crystals and the block crystals, preventing the block crystals from being mixed with the loose crystals after being discharged from the discharge port and packaged by the rake blade, and causing more crystals to stick together due to internal moisture penetration; by setting a crushing wheel on the sieve plate, the block crystals are repeatedly crushed to ensure the dispersion of the crystals and improve the drying efficiency of the crystals.

[0034] 4. In this invention, the humidity sensor detects the humidity of the crystals on the bottom drying tray in real time, thereby determining whether the current crystal drying speed is too fast or too slow. The amount of crystals fed into the hopper is controlled by adjusting the rising height of the blockage block, and the angle of the rake is controlled to pause the crystal feeding, thereby adjusting the crystal drying speed to ensure that the drying speed matches the drying amount and ensures drying efficiency.

[0035] 5. In this invention, the type of blocky crystals on the current sieve plate is determined by real-time detection of changes in the compression of the crushing spring. This allows for corresponding adjustments to the crushing rollers to better pulverize the blocky crystals, preventing excessive and hard blocky crystals from covering the sieve holes and hindering the smooth falling of loose crystals. Furthermore, by measuring the height of the crystal rings in real-time, the spacing between the rake blades is adjusted by changing the current flowing through the moving electromagnet, ensuring uniformity of the crystal ring height, consistent drying efficiency, and overall drying uniformity. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2 This is a schematic diagram of the internal structure of the overall components of the present invention;

[0038] Figure 3 This is an exploded structural diagram of the tumbling assembly and drying assembly of the present invention;

[0039] Figure 4 This is a schematic diagram of the structure of the flipping component and the cleaning component of the present invention;

[0040] Figure 5 This is a schematic diagram of the power assembly, stirring assembly, and drying assembly of the present invention;

[0041] Figure 6 This is a schematic diagram of the crushing component structure of the present invention;

[0042] Figure 7 This is a schematic diagram of the tank assembly structure of the present invention.

[0043] In the diagram: 1. Tank assembly; 101. Drying tank; 102. Top plate; 103. Inclined plate; 104. Bottom plate; 105. Support column; 2. Power assembly; 201. Motor; 202. Rotating shaft; 203. Deep trough; 3. Feed hopper; 4. Mixing assembly; 401. Mixing shaft; 402. Mixing blades; 403. Support column; 404. Telescopic cylinder; 405. Limiting plate; 5. Blocking block; 6. Drying assembly; 601. Drying plate; 602. Drying tray; 603. Flow pipe; 604. Straight pipe; 605. 606. Fixed ring; 607. Liquid inlet; 608. Liquid outlet; 7. Tilting assembly; 701. Fixed plate; 702. Rake rod; 703. Support spring; 704. Moving plate; 705. Rake blade; 706. Moving electromagnet; 8. Crushing assembly; 801. Crushing wheel; 802. Bending support plate; 803. Support plate; 804. Crushing spring; 805. Lifting column; 9. Cleaning assembly; 901. Parallel scraper; 902. Permanent magnet plate; 903. Strip electromagnet; 10. Exhaust port; 11. Screen plate; 12. Discharge port. Detailed Implementation

[0044] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0045] To address the issues of material clumping due to water seepage, which prevents separation and crushing, and the potential for material to adhere to the rake 705 during its turning process, leading to material waste and affecting the turning effect of the rake 705, Example 1 is proposed.

[0046] Example 1:

[0047] like Figures 1 to 7 As shown, the present invention provides a dryer, including a tank assembly 1, a power assembly 2 arranged on the central axis of the tank assembly 1, a feed hopper 3 arranged on the top of the tank assembly 1, a stirring assembly 4 and a blocking block 5 arranged inside the feed hopper 3, a drying assembly 6 arranged inside the tank assembly 1, a turning assembly 7 and a crushing assembly 8 evenly arranged on the power assembly 2, a discharge port 12 arranged at the bottom of the tank assembly 1, an exhaust port 10 arranged at the top of the tank assembly 1, and a screen plate 11 evenly arranged on the drying assembly 6.

[0048] By setting the turning component 7 to continuously turn the crystals on the drying component 6, the crystals can be evenly heated and dried quickly. The sieve plate 11 separates the agglomerated crystals from the loose crystals. Then, the crushing component 8 crushes the agglomerated crystals to avoid mixing the agglomerated and loose crystals in the packaging. The moisture inside the agglomerated crystals will evaporate and cause water vapor to be generated in the packaging bag, which will affect the quality of the loose crystals.

[0049] In actual production, due to the varying humidity levels of the crystals being processed, during the drying process, the moisture in the crystals evaporates as the drying component 6 heats up. Crystals with lower humidity evaporate as water vapor, while crystals with higher humidity may experience moisture leaching, leading to crystal adhesion and clumping. Furthermore, because the crystals themselves contain moisture, some crystals may adhere to the rake blade 705, affecting the humidity sensor's measurement on the rake blade 705.

[0050] To solve the above-mentioned technical problems, in this embodiment, as follows: Figures 3 to 4As shown, the crystals are flipped by a flipping component 7, and the blocky crystals on the rake 705 are scraped off by a cleaning component 9. Multiple flipping components 7 are arranged symmetrically about the rotating shaft 202. Each flipping component 7 includes a fixed plate 701, a rake rod 702 on one side of the fixed plate 701, and moving plates 704 evenly arranged on the rake rod 702. A rake 705 is rotatably connected to the end of the moving plate 704. A humidity sensor is installed on the rake 705. The bottom end of the rake 705 contacts the upper surface of the drying plate 601 or the drying tray 602. The angle of the rake 705 on the drying plate 601 is opposite to the angle of the rake 705 on the drying tray 602. The rake blade 705 on the drying plate 601 is inclined towards the edge of the drying plate 601, which facilitates the drying plate 601 to turn the crystals from its center to the edge and fall onto the edge of the lower drying tray 602. The rake blade 705 on the drying tray 602 is inclined towards the center of the drying tray 602, which facilitates the gradual turning of the crystals at the edge of the drying tray 602 into the circular hole at its center. A support spring 703 is provided at the end of the rake 702 away from the fixed plate 701. The support spring 703 is used to limit the movement distance of the outermost moving plate 704 and prevent it from falling off the rake 702. One end of the support spring 703 is fixedly connected to the moving plate 704 farthest from the fixed plate 701. A moving electromagnet 706 is fixedly provided on the moving plate 704. When a reverse current is passed through the moving electromagnet 706, a repulsive force is generated, so that adjacent electromagnets repel each other, ensuring that a stable interval distance can be formed. The cleaning assembly 9 includes a parallel scraper 901, which is slidably mounted on a rake 705. A permanent magnet plate 902 is fixedly mounted on the top of the parallel scraper 901, and a bar electromagnet 903 is fixedly mounted on the top of the rake 705. Under normal conditions, a reverse current is passed through the bar electromagnet 903 to generate magnetic repulsion, which causes the permanent magnet plate 902 to slide upward and remain in an elevated state. Under cleaning conditions, a forward current is passed through the bar electromagnet 903 to generate magnetic attraction, which causes the permanent magnet plate 902 to slide downward. The power assembly 2 includes a rotating shaft 202, with a motor 201 fixedly mounted at the bottom end of the rotating shaft 202 and a deep groove 203 formed at the top end of the rotating shaft 202.

[0051] When in use, the motor 201 rotates, driving the rotating shaft 202 to rotate. The rotating shaft 202 drives the turning component 7 to rotate, thereby driving the rake 705 to continuously turn the crystals on the drying plate 601 or drying tray 602. The continuous rotation of the rake 705 turns the crystals from the drying plate 601 to the next drying tray 602, and then to the next drying plate 601, until the crystals fall to the bottom of the tank component 1.

[0052] Under normal conditions, the humidity sensor readings on the drying plate 601 decrease gradually in a stepped manner from the inside out, while the humidity sensor readings on the drying tray 602 decrease gradually in a stepped manner from the outside in. Therefore, when either humidity sensor detects humidity significantly outside the stepped reading range, it can be determined that blocky crystals are adhering to the rake blade 705, causing the humidity sensor to be covered, resulting in the humidity sensor reading remaining unchanged or even increasing. During continuous drying, the crystals adhere to each other due to moisture seepage, forming blocks on the rake blade 705. At this time, the humidity inside the blocky crystals is higher than the humidity of the crystals on the drying plate 601 or drying tray 602, causing the humidity sensor readings to remain unchanged or increase. At this time, a positive current is passed through the control bar electromagnet 903, which generates a magnetic attraction force on the permanent magnet plate 902. The magnetic attraction force causes the permanent magnet plate 902 to slide downward, thereby driving the parallel scraper 901 to slide downward along the rake 705. The parallel scraper 901 scrapes the sides of the rake 705, thereby scraping off the blocky crystals adhering to the rake 705.

[0053] By setting a humidity sensor to detect the humidity of the crystals, it can also identify whether there are lumpy crystals adhering to the current rake blade 705. This allows the cleaning component 9 to clean the rake blade 705, preventing crystals from adhering to the rake blade 705 and affecting the humidity sensor's recognition, and preventing excessive crystal adhesion from affecting the crystal drying efficiency.

[0054] The humidity on the side of the block crystal that is in contact with the rake blade 705 is higher than that on the outside of the block crystal. When the cleaning component 9 scrapes the block crystal off the rake blade 705, if the block crystal is not crushed in time, after the block crystal and the loose crystal are packaged, the moisture inside the block crystal will seep out and cause more crystals to stick together.

[0055] To solve the above-mentioned technical problems, in this embodiment, as follows: Figure 6As shown, a sieve plate 11 separates loose crystals from block crystals, and a crushing assembly 8 crushes the block crystals. The crushing assembly 8 includes a crushing wheel 801 with a bent support plate 802 mounted on it. The crushing wheel 801 and the bent support plate 802 are rotatably mounted. A lifting column 805 is mounted on the top of the bent support plate 802, and a crushing spring 804 is mounted on the outer side of the lifting column 805. The crushing assembly 8 is symmetrically arranged about the central axis of the tank assembly 1 to form a crushing layer. The crushing layer is located in a circular hole in the center of the drying tray 602 and is evenly spaced. A support plate 803 is fixedly mounted on the fixing plate 701, and the lifting column 805 passes through the support plate 803. A limiting hole is provided in the center of the support plate 803. The lifting column 805 is slidably disposed in the limiting hole and rises and falls vertically along the limiting hole. The crushing spring 804 assists the lifting column 805 in resetting. One end of the crushing spring 804 is fixedly disposed on the bent support plate 802, and the other end is fixedly disposed on the support plate 803. The crushing wheel 801 is tightly disposed with the sieve plate 11. The crushing spring 804 generates an initial compression, forcing the crushing wheel 801 to press against the sieve plate 11. This facilitates the crushing wheel 801 to crush the block crystals while also facilitating the rapid fall of loose crystals from the sieve holes of the sieve plate 11.

[0056] During use, the rake blades 705 on the drying tray 602 gradually turn the crystals on the edge of the drying tray 602 into the circular hole in the center. The crystals fall onto the sieve plate 11. The loose crystals pass through the sieve holes of the sieve plate 11 and fall onto the next drying plate 601. The block crystals remain on the sieve plate 11. As the rotating shaft 202 drives the turning component 7 to rotate, the bending support plate 802 moves in a circular motion with the fixed plate 701, thereby driving the crushing wheel 801 to roll on the sieve plate 11, thereby crushing and pulverizing the block crystals. The crushed crystals fall through the sieve holes to the next layer for subsequent drying.

[0057] By setting up a sieve plate 11 to separate and screen loose crystals and block crystals, it is prevented that the block crystals will be mixed with the loose crystals after being discharged from the discharge port 12 and packaged together with the rake blade 705, and the internal moisture will penetrate and cause more crystals to stick together. By setting up a crushing wheel 801 on the sieve plate 11, the block crystals are repeatedly crushed to ensure the dispersion of crystals and improve the drying efficiency of crystals.

[0058] In this embodiment, as Figure 5As shown, the drying assembly 6 provides a drying heating medium, ensuring that the crystals can fully exchange heat with the heating medium and dry quickly. The drying assembly 6 includes a drying plate 601 and a drying tray 602, which are interleaved. The edge of the drying tray 602 is provided with an inclined ring plate to prevent crystals from splashing out when they fall from the upper layer. The diameter of the drying plate 601 is smaller than the inner diameter of the drying tray 602, ensuring that the crystals fall within the turning range of the rake 705 located on the drying tray 602. Both sides of the drying plate 601 and the drying tray 602 are provided with flow pipes 603, and the other end of the flow pipe 603 is fixedly provided with a straight pipe 604. One of the straight pipes 604 is provided with a liquid inlet 606, and the other straight pipe 604 is provided with a liquid outlet 607. The straight pipes 604 are fixed inside the tank assembly 1 by a fixing ring 605. The drying plate 601 and drying tray 602 are hollow and connected to the interior of the flow pipe 603. The flow pipe 603 is connected to the interior of the straight pipe 604, thereby ensuring that the heating medium can fill the interior of the drying plate 601 and drying tray 602 and exchange heat with the crystal. The heating medium can be saturated steam, hot water, heat transfer oil, or high-temperature molten salt, etc. In this embodiment, heat transfer oil is used as the heating medium. The heat transfer oil enters from the inlet 606 and passes through the straight pipe 604, the flow pipe 603, the drying plate 601 and drying tray 602, the flow pipe 603 on the other side, the straight pipe 604 on the other side, and then flows out through the outlet 607. The drying plate 601 is rotatably mounted on the rotating shaft 202. A circular hole is located at the center of the drying plate 602. A sieve plate 11 is fixedly mounted at the bottom of each circular hole. The diameter of the circular hole is larger than the diameter of the rotating shaft 202. The rotating shaft 202 passes through the circular hole but does not contact the drying plate 602. As the rake 705 flips, the crystals gradually move from the outer edge of the drying plate 602 to the center and fall through the circular hole onto the lower drying plate 601. The stirring assembly 4 includes a stirring shaft 401. The bottom end of the stirring shaft 401 is slidably mounted in a deep groove 203. A protruding rib is provided in the deep groove 203. A sliding groove is provided on the side of the bottom end of the stirring shaft 401. The protruding rib is engaged in the sliding groove and can slide along the groove. The trough slides, and the blockage block 5 is fixedly installed on the stirring shaft 401. The stirring shaft 401 is fixedly installed with stirring blades 402. The top end of the stirring shaft 401 is fixedly connected with a telescopic cylinder 404. Support columns 403 are evenly arranged on the feed hopper 3. The feed hopper 3 is set in an inverted cone shape, and the feed inlet extends into the drying tank 101. A limit plate 405 is fixedly installed on the support column 403. The telescopic cylinder 404 is rotatably installed on the central axis of the limit plate 405. The rotating shaft 202 rotates, and the stirring shaft 401 drives the stirring blades 402 to rotate, which stirs the crystals in the feed hopper 3 to prevent the wet crystals from sticking together and blocking the feed inlet, causing the crystals to be blocked in the feed hopper 3 and unable to fall smoothly.

[0059] In this embodiment, during use, the output end of the telescopic cylinder 404 is retracted, causing the blockage block 5 to rise and opening the feed inlet. The crystals begin to fall onto the first-layer drying plate 601. At the same time, the rake blades 705 on the drying plate 601 flip the crystals from the center of the drying plate 601 to the edge until the crystals fall to the edge of the second-layer drying tray 602. The rake blades 705 on the drying tray 602 flip the crystals from the edge of the drying tray 602 towards the central circular hole until the crystals fall from the circular hole. After passing through the sieve plate 11, the crystals fall onto the third-layer drying plate 601, forming a serpentine movement path, until the crystals fall from the circular hole of the last-layer drying tray 602 onto the inclined plate 103, completing the drying process, and are discharged from the discharge port 12.

[0060] like Figure 7 As shown, the tank assembly 1 includes a drying tank 101. The top plate 102 of the drying tank 101 is provided with an exhaust port 10. A suction device is connected to the exhaust port 10 to extract the water vapor generated inside the drying tank 101. The bottom plate 104 of the drying tank 101 is provided with an inclined plate 103. The inclined plate 103 facilitates the crystals to slide quickly into the discharge port 12 when they fall to the bottom of the drying tank 101. A through hole is provided at the lowest point of the inclined plate 103. The bottom plate 104 of the drying tank 101 is provided with a discharge port 12, which is corresponding to the through hole. The feed hopper 3 is fixedly located at the center of the top plate 102 and extends into the drying tank 101. Support columns 105 are evenly provided on the bottom plate 104.

[0061] The working principle of this invention is as follows: First, preheating is performed by introducing heat transfer oil into the drying assembly 6. The heat transfer oil flows as follows: it enters through the inlet 606, passes through the straight pipe 604, the flow pipe 603, the drying plate 601 and the drying tray 602, the flow pipe 603 on the other side, the straight pipe 604 on the other side, and flows out through the outlet 607. This preheats the drying tank 101, the drying plate 601 and the drying tray 602, making the heat distribution inside the drying tank 101 uniform.

[0062] Next, the material feeding begins. The motor 201 is started, which drives the rotating shaft 202 to rotate. The rotating shaft 202 drives the turning component 7, the crushing component 8 and the stirring component 4 to rotate. At the same time, the output end of the telescopic cylinder 404 is controlled to retract, which drives the blockage block 5 to rise, opens the feed port, and the crystals begin to fall onto the drying plate 601 of the first layer.

[0063] Then, as the crystals are turned, the rotating shaft 202 drives the turning component 7 to rotate. The rake blades 705 on the drying plate 601 turn the crystals from the center of the drying plate 601 to the edge until the crystals fall to the edge of the second drying tray 602. The rake blades 705 on the drying tray 602 turn the crystals from the edge of the drying tray 602 to the circular hole in the center until the crystals fall from the circular hole. After passing through the sieve plate 11, they fall onto the third drying plate 601, forming a serpentine movement path, until the crystals fall from the circular hole of the last drying tray 602 onto the inclined plate 103, completing the drying process, and then are discharged from the discharge port 12.

[0064] Next, the bulk crystals are identified and crushed. When any humidity sensor detects that the humidity is significantly outside the stepped reading range, it can be determined that bulk crystals are adhering to the current rake blade 705, causing the humidity sensor to be covered, resulting in the humidity sensor reading remaining unchanged or even increasing. Under continuous drying, the crystals stick together due to moisture seepage, adhering to the rake blade 705 and forming bulk crystals. At this time, the humidity inside the bulk crystals is higher than the humidity of the crystals on the drying plate 601 or drying tray 602, causing the humidity sensor reading to remain unchanged or increase. At this time, a positive current is applied to the bar electromagnet 903, generating a magnetic attraction force on the permanent magnet plate 902. The magnetic attraction force causes the permanent magnet plate 902 to slide downward, thereby driving the parallel scraper 901 to slide downward along the rake blade 705. The parallel scraper 901 scrapes the sides of the rake blade 705, thereby scraping off the bulk crystals adhering to the rake blade 705.

[0065] After the blocky crystals are scraped off, they are gradually turned over by the rake blades 705 on the drying tray 602 along with the loose crystals, and then fall onto the sieve plate 11. The loose crystals pass through the sieve holes of the sieve plate 11 and fall onto the next drying plate 601. The blocky crystals remain on the sieve plate 11. As the rotating shaft 202 rotates, the bending support plate 802 moves in a circular motion with the fixed plate 701, thereby driving the crushing wheel 801 to roll on the sieve plate 11, thus crushing and pulverizing the blocky crystals. The crushed crystals fall through the sieve holes to the next layer for subsequent drying.

[0066] Finally, the material is fed until the crystals fall from the circular holes of the last drying tray 602 onto the inclined plate 103, completing the drying process. The crystals are then discharged from the outlet 12.

[0067] Example 2:

[0068] The present invention also provides a sulfate removal process, comprising the above-mentioned dryer, including the following steps:

[0069] Step 1: Fix SO2. The SO2 gas generated during the production process is introduced into the desulfurization circulation tank. The deoxygenation circulation liquid absorbs SO2 and forms Na2SO3. Na2SO3 accumulates until it is near saturation.

[0070] Step 2: Na2SO4 precipitation. Air is introduced into the circulating slurry through an oxidation blower to oxidize Na2SO3 into Na2SO4. The temperature of the deoxygenated circulating liquid is then reduced to 20 degrees Celsius by a refrigeration unit, causing Na2SO4 to crystallize and precipitate.

[0071] Step 3: Separate Na2SO4 crystals. The circulating liquid containing Na2SO4 crystals is pumped into a hydrocyclone using an ammonium sulfate pump. The slurry containing crystals is separated in the hydrocyclone under the action of centrifugal force. The clear liquid at the top overflows back to the circulating slurry tank, while the turbid liquid at the bottom enters the centrifuge for further separation.

[0072] Step 4: Further separation of Na2SO4 crystals. The lower turbid liquid is further separated in a centrifuge under the action of centrifugal force. The liquid is returned to the circulating slurry tank, and the solid flows by gravity to the dryer.

[0073] Step 5: Dry the Na2SO4 crystals. Heat transfer oil is introduced into the drying component 6 in the dryer to dry the Na2SO4 containing moisture. The dried Na2SO4 is scraped to the discharge port 12 by the turning component 7.

[0074] The specific process for drying Na2SO4 crystals is as follows:

[0075] Step a: Preheat the drying assembly 6 by introducing heat transfer oil to maintain a uniform temperature inside the tank assembly 1.

[0076] Step b: Put the crystals to be dried into the feed hopper 3. The stirring component 4 drives the blockage block 5 to rise and fall to open the feed port, so that the crystals fall onto the drying component 6 for drying.

[0077] Step c: The turning component 7 scrapes the crystals from the drying component 6 to the bottom of the tank component 1, and the dried crystals are discharged from the outlet 12.

[0078] Step d: The water vapor generated during drying is extracted from the exhaust port 10.

[0079] Step 6: Pack Na2SO4 crystals. The dried Na2SO4 crystals are transported to a semi-automatic packaging machine and packaged into bags.

[0080] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dryer for a sulfate removal process, characterized by: The assembly includes a tank assembly (1), a power assembly (2) is provided on the central axis of the tank assembly (1), a feed hopper (3) is provided on the top of the tank assembly (1), a stirring assembly (4) and a blocking block (5) are provided inside the feed hopper (3), a drying assembly (6) is provided inside the tank assembly (1), a turning assembly (7) and a crushing assembly (8) are evenly provided on the power assembly (2), a cleaning assembly (9) is provided on the turning assembly (7), a discharge port (12) is provided at the bottom of the tank assembly (1), an exhaust port (10) is provided at the top of the tank assembly (1), and a sieve plate (11) is evenly provided on the drying assembly (6). The turning assembly (7) includes a fixed plate (701), a rake rod (702) is provided on one side of the fixed plate (701), a movable plate (704) is evenly provided on the rake rod (702), a rake blade (705) is rotatably connected to the end of the movable plate (704), and a humidity sensor is provided on the rake blade (705). The rolling assembly (8) includes a rolling wheel (801), a bending support plate (802) is provided on the rolling wheel (801), a lifting column (805) is provided on the top of the bending support plate (802), and a rolling spring (804) is provided on the outside of the lifting column (805). The cleaning assembly (9) includes a parallel scraper (901), which is slidably disposed on a rake (705). A permanent magnet plate (902) is fixedly disposed on the top of the parallel scraper (901), and a bar electromagnet (903) is fixedly disposed on the top of the rake (705), through which a positive current is passed. A support spring (703) is provided at the end of the rake (702) away from the fixed plate (701). One end of the support spring (703) is fixedly connected to the moving plate (704) farthest from the fixed plate (701). A moving electromagnet (706) is fixedly provided on the moving plate (704). A reverse current is passed through it, so that two adjacent moving plates (704) move away from each other. The power assembly (2) includes a rotating shaft (202), a motor (201) is fixedly installed at the bottom end of the rotating shaft (202), and a deep groove (203) is opened at the top end of the rotating shaft (202). The stirring assembly (4) includes a stirring shaft (401), the bottom end of which is slidably disposed in a deep groove (203), the blocking block (5) is fixedly disposed on the stirring shaft (401), and a stirring blade (402) is fixedly disposed on the stirring shaft (401). The drying assembly (6) includes a drying plate (601) and a drying tray (602), which are interleaved. The drying plate (601) is rotatably mounted on the rotating shaft (202). A circular hole is provided in the center of the drying tray (602). The sieve plate (11) is fixedly mounted at the bottom of each circular hole. The diameter of the circular hole is larger than the diameter of the rotating shaft (202). The rotating shaft (202) passes through the circular hole and does not contact the drying tray (602). The angle of the rake blade (705) on the drying plate (601) is opposite to the angle of the rake blade (705) on the drying tray (602); When the reading of any humidity sensor deviates significantly from the preset range, the control unit determines that there are blocky crystals adhering to the corresponding rake (705), controls the bar electromagnet (903) to pass a positive current, generates a magnetic attraction force on the permanent magnet plate (902), and the magnetic attraction force causes the permanent magnet plate (902) to slide downward, thereby driving the parallel scraper (901) to slide downward along the rake (705). The parallel scraper (901) scrapes the sides of the rake (705), thereby scraping off the blocky crystals adhering to the rake (705); while the crushing wheel crushes the blocky crystals, it also facilitates the rapid falling of loose crystals from the sieve holes of the sieve plate (11).

2. Dryer according to claim 1, characterized in that: The rolling assembly (8) is arranged symmetrically about the central axis of the tank assembly (1) to form a rolling layer. The rolling layer is evenly spaced. A support plate (803) is fixedly installed on the fixed plate (701). The lifting column (805) passes through the support plate (803). One end of the rolling spring (804) is fixedly installed on the bent support plate (802), and the other end is fixedly installed on the support plate (803). The rolling wheel (801) is closely attached to the sieve plate (11).

3. The dryer of claim 1, wherein: Both sides of the drying plate (601) and the drying tray (602) are provided with flow pipes (603) communicating with them. The other end of the flow pipe (603) is fixedly provided with a straight pipe (604). One of the straight pipes (604) is provided with a liquid inlet (606), and the other straight pipe (604) is provided with a liquid outlet (607). The straight pipe (604) is fixedly installed inside the tank assembly (1) by a fixing ring (605).

4. The dryer of claim 1, wherein: The top end of the stirring shaft (401) is fixedly connected to a telescopic cylinder (404), and a support column (403) is evenly arranged on the feed hopper (3). A limit plate (405) is fixedly arranged on the support column (403), and the telescopic cylinder (404) is rotatably arranged on the central axis of the limit plate (405).

5. The dryer according to claim 1, characterized in that: The tank assembly (1) includes a drying tank (101). The top plate (102) of the drying tank (101) is provided with an exhaust port (10). The bottom plate (104) of the drying tank (101) is provided with an inclined plate (103). The lowest point of the inclined plate (103) is provided with a through hole. The bottom plate (104) of the drying tank (101) is provided with a discharge port (12). The discharge port (12) is provided in correspondence with the through hole. The feed hopper (3) is fixedly provided at the center of the top plate (102) and extends into the drying tank (101). Support columns (105) are evenly provided on the bottom plate (104).

6. A sulfate removal process comprising a dryer as described in any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Fix SO2. The SO2 gas generated during the production process is introduced into the desulfurization circulation tank. The desulfurization circulation liquid absorbs SO2 and forms Na2SO3. Na2SO3 accumulates until it is near saturation. Step 2: Na2SO4 precipitation. Air is introduced into the circulating slurry through an oxidation blower to oxidize Na2SO3 into Na2SO4. The temperature of the desulfurization circulating liquid is reduced to 20 degrees Celsius by a chiller, and Na2SO4 crystallizes out. Step 3: Separate Na2SO4 crystals. The circulating liquid containing Na2SO4 crystals is pumped into a hydrocyclone using an ammonium sulfate pump. The slurry containing crystals is separated in the hydrocyclone under the action of centrifugal force. The clear liquid at the top overflows back to the circulating slurry tank, while the turbid liquid at the bottom enters a centrifuge for further separation. Step 4: Further separate the Na2SO4 crystals. The lower turbid liquid is further separated in a centrifuge under the action of centrifugal force. The liquid is returned to the circulating slurry tank, and the solid flows by gravity to the dryer. Step 5: Dry the Na2SO4 crystals. Heat transfer oil is introduced into the drying component (6) in the dryer to dry the Na2SO4 containing moisture. The dried Na2SO4 is scraped to the discharge port (12) by the turning component (7). Step 6: Pack Na2SO4 crystals. The dried Na2SO4 crystals are transported to a semi-automatic packaging machine and packaged into bags.

7. The sulfate removal process according to claim 6, characterized in that, Step five includes the following steps: Step a: Preheat the drying assembly (6) by introducing heat transfer oil to keep the temperature inside the tank assembly (1) uniform; Step b: Put the crystals to be dried into the feed hopper (3), and use the stirring component (4) to drive the blockage block (5) to lift and lower to open the feed port, so that the crystals fall onto the drying component (6) for drying; Step c: The turning component (7) scrapes the crystals from the drying component (6) to the bottom of the tank component (1), and the dried crystals are discharged from the outlet (12); Step d: The water vapor generated during drying is extracted from the exhaust port (10).

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