Drying machine and sulfate removal process comprising same

Abstract

The invention relates to the technical field of drying machines, and discloses a drying machine and a sulfate removal process comprising the drying machine, the drying machine comprises a tank body assembly, a power assembly is arranged on the central axis of the tank body assembly, a feeding hopper is arranged at the top of the tank body assembly, and a stirring assembly and a blocking block are arranged in the feeding hopper; a drying assembly is arranged in the tank body assembly, a turning assembly and a rolling assembly are uniformly arranged on the power assembly, a cleaning assembly is arranged on the turning assembly, a discharging opening is formed in the bottom of the tank body assembly, and sieve plates are uniformly arranged on the drying assembly; according to the crystal drying device, crystals on the drying assembly are continuously overturned by arranging the overturning assembly, so that the crystals can be subjected to uniform heat exchange and rapid drying, caked crystals and bulk crystals are separated by arranging the sieve plate, the caked crystals are crushed in cooperation with the grinding assembly, and mixed packaging of the blocky crystals and the bulk crystals is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of dryers, and in particular to a dryer and a sulfate removal process comprising the dryer. Background Art

[0002] The disc continuous dryer is a highly efficient conduction-type 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. The wet material is continuously added from the feeder to the first layer of drying disc on the upper part of the dryer, and the rake arm with rakes rotates to make the rakes continuously turn the material.

[0003] The Chinese invention patent with application number 202110662404.7 proposes a disc dryer, including a shell, a rotating shaft is arranged in the shell, a first heating disc distributed in an array is arranged on the rotating shaft, a second heating disc distributed in an array is arranged on the rotating shaft, a hopper is arranged on the shell, an exhaust fan is arranged on the shell, a rake arm is arranged on the first heating disc, and rake leaves are arranged on the rake arm. The first heating disc includes a plurality of fan-shaped discs, an inner vertical cylinder is arranged on the first heating disc, and the inner vertical cylinder is connected to the fan-shaped disc, an input port is arranged on one side of the fan-shaped disc, and an output port is arranged on the other side. In this practical disc dryer, the heating disc is divided into a plurality of fan-shaped small discs, arc plates and arc blocks are arranged in the fan-shaped small discs, and a flow chamber is formed in the heating disc to reduce the thermal stress of the heating disc and protect the disc surface.

[0004] However, in the prior art, it is impossible to separate and crush the lumps generated by water seepage in the material during the drying process; if the lumps are not crushed in time, the lumps will be mixed with the dried materials and packaged later, and the water seeping out will cause more crystals to stick to each other, thereby affecting the quality of the material; in addition, since the material itself has a certain humidity, it may adhere to the rake during the rake's turning process, resulting in material waste and affecting the turning effect of the rake.

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

[0006] The object of the present invention is to provide a dryer and a sulfate removal process comprising the dryer to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solutions: a dryer, comprising a tank assembly, a power assembly is arranged on the central axis of the tank assembly, a feed hopper is arranged on the top of the tank assembly, a stirring assembly and a blocking block are arranged inside the feed hopper, a drying assembly is arranged inside the tank assembly, a turning assembly and a rolling assembly are evenly arranged on the power assembly, a cleaning assembly is arranged on the turning assembly, a discharge port is arranged at the bottom of the tank assembly, an exhaust port is arranged on the top of the tank assembly, and sieve plates are evenly arranged on the drying assembly;

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

[0009] The rolling assembly comprises a rolling wheel, a bending support plate is arranged on the rolling wheel, a lifting column is arranged on the top of the bending support plate, and a rolling spring is arranged on the outer side of the lifting column.

[0010] Preferably, the cleaning assembly comprises a parallel scraper, the parallel scraper is slidably arranged on a rake, a permanent magnetic plate is fixedly arranged on the top of the parallel scraper, and a bar-shaped electromagnet is fixedly arranged on the top of the rake;

[0011] A support spring is arranged at one end of the rake rod away from the fixed plate, one end of the support spring is fixedly connected to a movable plate farthest from the fixed plate, and a movable electromagnet is fixedly arranged on the movable plate.

[0012] Preferably, the rolling assembly is rotationally symmetrically arranged with the central axis of the tank assembly as the center to form a rolling layer, the rolling layers are evenly and equidistantly arranged, a support plate is fixedly arranged on the fixed plate, the lifting column is passed through the support plate, one end of the rolling spring is fixedly arranged on the bent support plate, and the other end is fixedly arranged on the support plate, and the rolling wheel is tightly arranged on the screen plate.

[0013] Preferably, the drying assembly includes a drying plate and a drying tray, the drying plate and the drying tray are interlaced, both sides of the drying plate and the drying tray are provided with flow pipes, the other end of the flow pipe is fixedly provided with a straight pipe, any one of the straight pipes is provided with a liquid inlet, the other straight pipe is provided with a liquid outlet, and the straight pipe is fixedly provided inside the tank assembly by a fixing ring.

[0014] Preferably, the power assembly comprises a rotating shaft, a motor is fixedly arranged 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 arranged on a rotating shaft, a circular hole is arranged at the center of the drying plate, the diameter of the circular hole is larger than the diameter of the rotating shaft, and the rotating shaft passes through the circular hole without contacting the drying plate.

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

[0017] Preferably, the tank body assembly includes a drying tank, an exhaust port is provided on the top plate of the drying tank, an inclined plate is provided on the bottom plate of the drying tank, a through hole is provided at the lowest point of the inclined plate, a discharge port is provided on the bottom plate of the drying tank, 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 support columns are evenly provided on the bottom plate.

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

[0019] Step 1: Fix SO2. The SO2 gas generated during the production process is introduced into the desulfurization circulation pool. The deoxygenated circulating liquid absorbs SO2 to form Na2SO4, which accumulates until it reaches near saturation.

[0020] Step 2: Precipitate NaSO. Air is introduced into the circulating slurry through an oxidation fan to oxidize NaSO into NaSO. The temperature of the deoxygenated circulating liquid is lowered to degrees through a refrigerator to precipitate NaSO crystals.

[0021] Step 3: Separate NaSO crystals. The circulating liquid containing NaSO crystals is pumped into a hydrocyclone through an ammonium sulfate pump. The slurry containing the crystals is separated in the hydrocyclone under the action of centrifugal force. The upper clear liquid overflows and flows back to the circulating slurry pool. The lower turbid liquid enters the centrifuge for further separation.

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

[0023] Step 5: Drying NaSO crystals: introducing heat transfer oil into the drying component in the dryer to dry the NaSO containing water, and the dried NaSO is scraped to the discharge port by the turning component;

[0024] Step 6: Packing NaSO crystals: convey the dried NaSO crystals to a semi-automatic packing machine and pack them into bags.

[0025] Step five includes the following steps:

[0026] Step a, introducing heat transfer oil into the drying assembly for preheating so that the temperature inside the tank assembly remains uniform;

[0027] Step b, putting the crystals to be dried into the feed hopper, driving the blocking block to rise and fall through the stirring assembly to open the feed port, so that the crystals fall onto the drying assembly for drying;

[0028] Step c, flipping the assembly to scrape the crystals from the drying assembly to the inner bottom of the tank assembly, and the dried crystals are discharged from the discharge port;

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

[0030] Technical effects and advantages of the present invention:

[0031] 1. In the present invention, a turning component is provided to continuously turn over the crystals on the drying component, so that the crystals can exchange heat evenly and dry quickly. A sieve plate is provided to separate the agglomerated crystals from the loose crystals, and then a rolling component is used to crush the agglomerated crystals to avoid mixed packaging of block crystals and loose crystals. The moisture inside the block crystals is dissipated to generate water vapor in the packaging bag, which affects the quality of the loose crystals.

[0032] 2. In the present invention, the humidity of the crystal is detected by setting a humidity sensor, and it can timely identify whether there are block crystals adhering to the current rake, thereby controlling the cleaning component to clean the rake, preventing the crystals from adhering to the rake and affecting the recognition of the humidity sensor, and preventing the crystals from adhering to each other too much and affecting the crystal drying efficiency.

[0033] 3. In the present invention, a sieve plate is provided to separate and screen the loose crystals and block crystals, so as to prevent the subsequent block crystals from being discharged from the discharge port with the turning of the rake and mixed with the loose crystals and packaged, and the internal moisture penetration causes more crystals to stick to each other; by providing 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 the present invention, the humidity of the crystals on the bottom drying plate is detected in real time by a humidity sensor, so as to determine whether the current drying speed of the crystals is too fast or too slow, and thus the amount of crystals discharged into the feed hopper is controlled by controlling the rising height of the blocking block, and the angle of the rake is controlled to achieve the suspension of crystal conveying and other actions to adjust the drying speed of the crystals, ensure that the drying speed of the crystals matches the drying amount, and ensure the drying efficiency.

[0035] 5. In the present invention, the type of block crystals on the current screen plate is determined by detecting the change in the compression amount of the rolling spring in real time, so as to control the rolling wheel to make corresponding adjustments, so as to better crush the block crystals, thereby avoiding too many block crystals that are too hard and spread on the screen plate to block the screen holes, making it difficult for the loose crystals to fall smoothly; by measuring the height of the crystal ring in real time, the spacing between the rakes is adjusted by changing the current passed through the moving electromagnet, so as to unify the height of the crystal ring, ensure the uniformity of drying, and ensure the drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0038] Figure 3 This is a schematic diagram of the explosion structure of the flipping component and the drying component of the present invention;

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

[0040] Figure 5 It is a schematic diagram of the structure of the power component, the stirring component and the drying component of the present invention;

[0041] Figure 6 It is a schematic diagram of the structure of the rolling assembly of the present invention;

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

[0043] In the figure: 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 groove; 3. Feed hopper; 4. Stirring assembly; 401. Stirring shaft; 402. Stirring blade; 403. Support column; 404. Telescopic cylinder; 405. Limit plate; 5. Blocking block; 6. Drying assembly; 601. Drying plate; 602. Drying plate; 603. Through pipe; 604. Straight pipe; 605. Fixed ring; 606, liquid inlet; 607, liquid outlet; 7, flip assembly; 701, fixed plate; 702, rake rod; 703, support spring; 704, movable plate; 705, rake knife; 706, movable electromagnet; 8, rolling assembly; 801, rolling wheel; 802, bending support plate; 803, support plate; 804, rolling spring; 805, lifting column; 9, cleaning assembly; 901, parallel scraper; 902, permanent magnet plate; 903, strip electromagnet; 10, exhaust port; 11, sieve plate; 12, discharge port. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0045] In order to solve the problem that the material clumps due to water seepage, cannot be separated and crushed, and the material may adhere to the rake 705 during the turning process of the rake 705, resulting in material waste and affecting the turning effect of the rake 705, embodiment 1 is proposed.

[0046] Embodiment 1:

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

[0048] By setting up a turning component 7 to continuously turn over the crystals on the drying component 6, the crystals can exchange heat evenly and dry quickly. By setting up a sieve plate 11, the agglomerated crystals are separated from the loose crystals, and then the agglomerated crystals are crushed with the rolling component 8 to avoid mixed packaging of block crystals and loose crystals. The moisture inside the block crystals will dissipate, causing water vapor to be generated in the packaging bag, affecting the quality of the loose crystals.

[0049] In actual production, due to the different humidity of the crystals to be processed, during the drying process, the water in the crystals will evaporate as the drying component 6 is heated, the water inside the crystals with lower humidity will evaporate in the form of water vapor, and the crystals with higher humidity may have water leaching, resulting in crystal adhesion, thus causing the crystals to agglomerate. In addition, since the crystals themselves have humidity, the crystals will also adhere to the rake 705, thereby affecting the measurement of the humidity sensor on the rake 705.

[0050] In order to solve the above technical problems, in this embodiment, Figure 3 to Figure 4As shown, the crystals are flipped by setting a flipping assembly 7, and the block crystals on the rake 705 are scraped off by setting a cleaning assembly 9. The flipping assembly 7 is rotationally symmetrically arranged with the rotating shaft 202 as the center. The flipping assembly 7 includes a fixed plate 701, a rake rod 702 is arranged on one side of the fixed plate 701, and a movable plate 704 is evenly arranged on the rake rod 702. The end of the movable plate 704 is rotatably connected with a rake 705, and the rake 705 is provided with a humidity sensor. The bottom end of the rake 705 contacts the upper surface of the drying plate 601 or the drying tray 602, and 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 drying plate 601 The rake blade 705 on the drying plate 601 is inclined toward the edge of the drying plate 601, so that the drying plate 601 can flip the crystal from its center to the edge and drop it to the edge of the drying plate 602 on the lower layer. The rake blade 705 on the drying plate 602 is inclined toward the center of the drying plate 602, so that the crystal on the edge of the drying plate 602 can be gradually flipped to the circular hole in its center. The end of the rake rod 702 away from the fixed plate 701 is provided with a support spring 703, and the support spring 703 is used to limit the moving distance of the outermost moving plate 704 to prevent it from being separated from the rake rod 702. One end of the support spring 703 is fixedly connected to the moving plate 704 farthest from the fixed plate 701, and a moving electromagnet 706 is fixedly provided on the moving plate 704. The moving electromagnet 706 is fed with a reverse current to generate a repulsive force, so that the two adjacent ones repel each other, and a stable spacing distance can be formed. The cleaning component 9 includes a parallel scraper 901, which is slidably arranged on the rake 705, a permanent magnet plate 902 is fixedly arranged on the top of the parallel scraper 901, and a bar electromagnet 903 is fixedly arranged on the top of the rake 705; in a normal state, a reverse current is passed into the bar electromagnet 903 to generate a magnetic repulsion force, which causes the permanent magnet plate 902 to slide upward and remain in an elevated state; in a cleaning state, a forward current is passed into the bar electromagnet 903 to generate a magnetic attraction force, which causes the permanent magnet plate 902 to slide downward. The power component 2 includes a rotating shaft 202, a motor 201 is fixedly arranged 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.

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

[0052] Under normal conditions, the humidity sensor reading on the drying plate 601 shows a trend of gradually decreasing from the inside to the outside in a step-like manner, and the humidity sensor on the drying tray 602 shows a trend of gradually decreasing from the outside to the inside in a step-like manner. Therefore, when any humidity sensor detects that the humidity is obviously not within the range of the step-like reading, it can be determined that block crystals are currently adhered to the rake 705, causing the humidity sensor to be covered, thereby causing the humidity sensor to detect that the reading remains unchanged or increases. Under continuous drying, the crystals adhere to each other due to water seepage, and stick to the rake 705 and form a block. At this time, the humidity inside the block crystal is larger than the humidity of the crystals on the drying plate 601 or the drying tray 602, which will cause the humidity sensor reading to remain unchanged or increase. At this time, the bar electromagnet 903 is controlled to pass a positive current to generate a magnetic attraction on the permanent magnet plate 902. The magnetic attraction 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 two sides of the rake 705, thereby scraping off the block crystals adhered to the rake 705.

[0053] By setting a humidity sensor to detect the humidity of the crystal, it is possible to timely identify whether there are block crystals adhering to the current rake 705, thereby controlling the cleaning component 9 to clean the rake 705, preventing the crystals from adhering to the rake 705 and affecting the recognition of the humidity sensor, and preventing the crystals from adhering to each other too much and affecting the crystal drying efficiency.

[0054] The humidity on the side where the block crystal is in contact with the rake 705 is higher than the humidity on the outside of the block crystal. When the cleaning component 9 scrapes the block crystal from the rake 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 to each other.

[0055] In order to solve the above technical problems, in this embodiment, Figure 6As shown, the sieve plate 11 is provided to separate the bulk crystals from the bulk crystals, and then the crushing assembly 8 is provided to crush the bulk crystals. The crushing assembly 8 includes a crushing wheel 801, on which a bending support plate 802 is provided, the crushing wheel 801 and the bending support plate 802 are rotatably provided, a lifting column 805 is provided on the top of the bending support plate 802, and a crushing spring 804 is provided on the outer side of the lifting column 805; the crushing assembly 8 is rotationally symmetrically provided with the central axis of the tank assembly 1 as the center of the circle to form a crushing layer, the crushing layer is provided in the circular hole in the center of the drying plate 602, and the crushing layer is evenly and equidistantly provided, a support plate 803 is fixedly provided on the fixed plate 701, and the lifting column 805 is passed through the support plate 803, A limiting hole is set at the center of the support plate 803, and the lifting column 805 is slidably set in the limiting hole and vertically lifted and lowered along the limiting hole. The rolling spring 804 assists the lifting column 805 to reset. One end of the rolling spring 804 is fixedly set on the bent support plate 802, and the other end is fixedly set on the support plate 803. The rolling wheel 801 is tightly set against the sieve plate 11. The rolling spring 804 generates an initial compression amount, forcing the rolling wheel 801 to be tightly set against the sieve plate 11, so that the rolling wheel 801 can crush the block crystals while also facilitating the loose crystals to fall quickly from the sieve holes of the sieve plate 11.

[0056] When in use, the rake 705 on the drying plate 602 gradually flips the crystals on the edge of the drying plate 602 to the circular hole in the center of the drying plate 602, and 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 drying plate 601 of the next layer, and the block crystals remain on the sieve plate 11. As the rotating shaft 202 drives the flipping assembly 7 to rotate, the bent support plate 802 moves in a circle with the fixed plate 701, thereby driving the rolling wheel 801 to roll on the sieve plate 11, thereby crushing the block crystals, and the crushed crystals fall through the sieve holes to the next layer for subsequent drying.

[0057] The sieve plate 11 is provided to separate and screen the loose crystals and block crystals, so as to prevent the subsequent block crystals from being turned over by the rake 705, being discharged from the discharge port 12 and mixed and packaged with the loose crystals, and preventing the internal moisture from penetrating and causing more crystals to stick to each other; by providing a crushing wheel 801 on the sieve plate 11, the block crystals are repeatedly crushed to ensure the dispersion of the crystals and improve the drying efficiency of the crystals.

[0058] In this embodiment, Figure 5As shown, by providing a drying component 6 to provide a drying heating medium, it is ensured that the crystal can fully exchange heat with the heating medium and dry quickly. The drying component 6 includes a drying plate 601 and a drying tray 602, and the drying plate 601 and the drying tray 602 are interlaced. The edge of the drying tray 602 is provided with an oblique ring plate to prevent the crystal from splashing when it falls 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 crystal falls into the flipping 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 a through pipe 603, and the other end of the through pipe 603 is fixedly provided with a straight pipe 604, any straight pipe 604 is provided with a liquid inlet 606, and the other straight pipe 604 is provided with a liquid outlet 607, and the straight pipe 604 is fixedly provided inside the tank assembly 1 through a fixing ring 605. The drying plate 601 and the drying tray 602 are hollow and connected to the inside of the through-flow pipe 603, and the through-flow pipe 603 is connected to the inside of the straight-through pipe 604, so as to ensure that the heating medium can fill the inside of the drying plate 601 and the 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 liquid inlet 606 and passes through the straight-through pipe 604, the through-flow pipe 603, the drying plate 601 and the drying tray 602, the through-flow pipe 603 on the other side, and the straight-through pipe 604 on the other side, and then flows out through the liquid outlet 607. The drying plate 601 is rotatably arranged on the rotating shaft 202, and a circular hole is arranged in the center of the drying plate 602. The sieve plate 11 is fixedly arranged 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 plate 602. With the turning of the rake 705, the crystal is conveniently moved from the outer edge of the drying plate 602 to the center and falls from the circular hole to the drying plate 601 on the lower layer; the stirring component 4 includes a stirring shaft 401, and the bottom end of the stirring shaft 401 is slidably arranged in the deep groove 203, and a convex strip is arranged in the deep groove 203. The bottom end side of the stirring shaft 401 is provided with a slide groove, and the convex strip is stuck in the slide groove and can slide along the slide groove. The groove slides, the blocking block 5 is fixedly arranged on the stirring shaft 401, the stirring blade 402 is fixedly arranged on the stirring shaft 401, the top of the stirring shaft 401 is fixedly connected with a telescopic cylinder 404, and the feed hopper 3 is evenly provided with support columns 403. The feed hopper 3 is arranged in an inverted cone shape, and the feed port extends into the drying tank 101. 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. The rotating shaft 202 rotates, and the stirring blade 402 is driven to rotate through the stirring shaft 401 to stir the crystals in the feed hopper 3 to prevent the wet crystals from sticking to each other and blocking the feed port, causing the crystals to be blocked in the feed hopper 3 and unable to fall smoothly.

[0059] In this embodiment, when in use, the output end of the telescopic cylinder 404 is controlled to retract, driving the blocking block 5 to rise, opening the feed port, and the crystals begin to fall onto the drying plate 601 of the first layer. At the same time, the rake 705 on the drying plate 601 flips the crystals from the center to the edge of the drying plate 601 until the crystals fall to the edge of the drying disk 602 of the second layer. The rake 705 on the drying disk 602 flips the crystals from the edge to the circular hole in the center of the drying disk 602 until the crystals fall from the circular hole, pass through the sieve plate 11, and fall onto the drying plate 601 of the third layer, forming a serpentine moving path, until the crystals fall from the circular hole of the drying disk 602 of the last layer onto the inclined plate 103, completing the drying, and are discharged from the discharge port 12.

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

[0061] The working principle of the present invention is as follows: first, preheating is performed, and heat transfer oil is introduced into the drying component 6. The heat transfer oil flows as follows: entering through the liquid inlet 606, passing through the straight-through pipe 604, the flow pipe 603, the drying plate 601 and the drying disk 602, the flow pipe 603 on the other side, the straight-through pipe 604 on the other side, and out through the liquid outlet 607; thereby preheating the drying tank 101, the drying plate 601 and the drying disk 602, so that the heat distribution inside the drying tank 101 is uniform.

[0062] Secondly, start unloading, start the motor 201, drive the rotating shaft 202 to rotate, the rotating shaft 202 drives the turning component 7, the rolling component 8 and the stirring component 4 to rotate, and at the same time, control the output end of the telescopic cylinder 404 to retract, drive the blocking block 5 to rise, open the feed port, and the crystals begin to fall onto the first layer of the drying plate 601.

[0063] Then, the crystal is turned over. During the process of the turning assembly 7 driven by the rotating shaft 202 to rotate, the rake 705 on the drying plate 601 turns the crystal from the center to the edge of the drying plate 601 until the crystal falls to the edge of the drying plate 602 of the second layer. The rake 705 on the drying plate 602 turns the crystal from the edge to the circular hole in the center of the drying plate 602 until the crystal falls from the circular hole, passes through the sieve plate 11 and falls onto the drying plate 601 of the third layer, forming a serpentine moving path, until the crystal falls from the circular hole of the last layer of the drying plate 602 onto the inclined plate 103, completes drying, and is then discharged from the discharge port 12.

[0064] Then, identify and crush bulk crystals, when any humidity sensor detects that the humidity is obviously not within the range of step-shaped indication, it can be judged that there are bulk crystals adhered to the current rake 705, causing the humidity sensor to be covered, thereby causing the humidity sensor to detect that the indication is unchanged or increases instead. Under continuous drying, the crystals cause mutual adhesion due to moisture seepage, and stick to the rake 705 and form a block. At this time, the humidity inside the bulk crystal is larger than the crystal humidity on the drying plate 601 or the drying plate 602, which can cause the humidity sensor indication to be unchanged or increase. At this time, the control bar electromagnet 903 is passed through a forward current, and a magnetic attraction is generated on the permanent magnetic plate 902, and the magnetic attraction causes the permanent magnetic plate 902 to slide downward, thereby driving the parallel scraper 901 to slide downward along the rake 705, and the parallel scraper 901 scrapes the two sides of the rake 705, thereby scraping off the bulk crystals adhered to the rake 705.

[0065] After the block crystals are scraped off, the rake 705 on the drying plate 602 together with the loose crystals gradually flips the crystals on the edge of the drying plate 602 into the circular hole in its center, and 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 drying plate 601 of the next layer, while the block crystals remain on the sieve plate 11. As the rotating shaft 202 rotates, the bent support plate 802 moves in a circle with the fixed plate 701, thereby driving the rolling wheel 801 to roll on the sieve plate 11, thereby rolling and crushing the block crystals. The crushed crystals fall through the sieve holes to the next layer for subsequent drying.

[0066] Finally, the material is unloaded until the crystals fall from the circular holes of the last layer of drying tray 602 onto the inclined plate 103 , and the drying is completed, and the crystals are discharged from the discharge port 12 .

[0067] Embodiment 2:

[0068] Based on the technical solution of the above-mentioned embodiment 1, the block crystals are crushed by setting a rolling assembly 8, but if there are too many block crystals, it will also affect the drying efficiency and prolong the drying time; in addition, the drying turning speed and the drying discharge amount need to be adaptively adjusted according to the humidity of the crystals to ensure the drying efficiency; finally, since the height of the crystal ring formed by the inner circle is higher than the height of the crystal ring formed by the outer circle, and the slump of crystals with different humidity is also different, the height of the crystal ring is different, which leads to uneven heat exchange of the crystals and reduces the drying efficiency of the dryer; and then the following technical solutions are proposed to solve the above-mentioned technical problems.

[0069] When crystals with different humidity levels are dried, the drying effects are different at the same turning speed and feeding amount. Crystals with low humidity may be dried before being transferred to the drying plate 602 at the bottom layer, while crystals with high humidity may have reached the inclined plate 103 at the bottom of the drying tank 101 but have not yet been dried.

[0070] The humidity of the crystals at various positions is detected in real time by the humidity sensor, so as to judge the current drying condition of the crystals. When the humidity sensor on the non-bottom drying plate 602 detects that the current crystals have reached the humidity content required for drying, it can be judged that the drying speed of the current drying component 6 is too fast, resulting in the crystals being dried before reaching the bottom drying plate 602. At this time, the crystal drying speed is slowed down by increasing the amount of material discharged and the amount of crystal drying. The specific steps are as follows: the output end of the telescopic cylinder 404 is controlled to increase the amount of retraction, thereby driving the blocking block 5 to rise again, expanding the feed port, thereby increasing the amount of crystals falling, and avoiding the subsequent crystals reaching the drying requirements before reaching the bottom drying plate 602, thereby ensuring the drying efficiency.

[0071] When the humidity sensor on the bottom drying plate 602 detects that the current crystal has not yet reached the humidity content required for drying, it can be determined that the drying speed of the current drying component 6 is too slow, resulting in the crystal being unable to be dried when it is about to reach the bottom of the drying tank 101. At this time, the feeding hopper 3 is suspended, and the rake 705 on the drying plate 601 is controlled to rotate twice to an angle consistent with the initial angle of the rake 705 on the drying plate 602, and the rake 705 on the drying plate 602 is rotated twice to an angle consistent with the initial angle of the rake 705 on the drying plate 601, and after completing a circular rotation, each returns to the initial angle to complete a circular rotation, and the above steps are repeated repeatedly, while controlling the motor 201 to drive the rotating shaft 202 to rotate faster, thereby accelerating the flipping speed. It is ensured that the crystal transmission is temporarily stopped while the continuous flipping of the crystal can be achieved. When the humidity sensor on the bottom drying plate 602 detects that the current crystal has reached the humidity content required for drying, the rake blade 705 is controlled to restore the initial angle, restore the normal transmission of the crystal, and turn the crystal to the bottom of the drying tank 101 for unloading. At the same time, the initial speed of the motor 201 is restored. At the same time, the unloading of the feed hopper 3 is restored, and the output end of the telescopic cylinder 404 is controlled to reduce the retraction amount, thereby driving the blocking block 5 to reduce the rising distance and reduce the feed port, so that the amount of crystal falling becomes less, thereby accelerating the drying speed of the crystal, ensuring that the subsequent crystals meet the drying requirements when they are located on the bottom drying plate 602, and ensuring the drying efficiency.

[0072] The humidity of the crystals on the bottom drying plate 602 is detected in real time by a humidity sensor, so as to determine whether the current crystal drying speed is too fast or too slow. The amount of crystals discharged into the feed hopper 3 is controlled by controlling the rising height of the blocking block 5, and the angle of the rake 705 is controlled to achieve actions such as pausing the crystal conveying, so as to adjust the drying speed of the crystals, ensure that the drying speed of the crystals matches the drying amount, and ensure the drying efficiency.

[0073] When drying crystals with high humidity, water seeps out too quickly, causing the crystals to stick to each other. Although they will be crushed by the crushing assembly 8 later, when there are too many block crystals and they are too hard, they will spread on the sieve plate 11, blocking a large number of sieve holes, resulting in the loose crystals that are subsequently pushed into the circular holes by the rake 705 unable to fall smoothly, thereby affecting the drying efficiency.

[0074] In order to solve the above technical problems, the amount of block crystals on the sieve plate 11 is identified by real-time detection of the change in compression of the rolling spring 804. Since the loose crystals will fall from the sieve holes of the sieve plate 11 when they contact the sieve plate 11, when the rolling wheel 801 passes over the loose crystals, the rolling wheel 801 will not be lifted up, and the rolling spring 804 will not produce a change in compression. When the rolling wheel 801 passes over the block crystals, the thickness of the block crystals themselves will cause the rolling wheel 801 to be lifted up, and the rolling wheel 801 generates pressure to crush the block crystals, thereby causing the rolling spring 804 to increase in compression and immediately recover. When the rolling wheel 801 passes over overlapping block crystals or relatively hard block crystals, the rolling wheel 801 is lifted up, and the rolling spring 804 is compressed and temporarily maintained.

[0075] When the rolling spring 804 produces a temporarily maintained compression, it can be determined that there are hard block crystals or multi-layer block crystals on the current screen plate 11. By setting a micro electromagnet on the side of the support plate 803 facing the bending support plate 802 and setting a micro permanent magnet on the bending support plate 802, the rolling wheel 801 can be controlled to produce a knocking action. Specifically: by passing intermittent current through the micro electromagnet, intermittent magnetic attraction is generated on the micro permanent magnet sheet. When current is passed through the micro electromagnet, the bending support plate 802 is attracted to drive the rolling wheel 801 to rise upward. When the current is stopped, the bending support plate 802 loses its magnetic attraction, and the elastic force of the rolling spring 804 drives the bending support plate 802 and the rolling wheel 801 to reset, thereby generating a knocking force on the sieve plate 11, causing the sieve plate 11 to vibrate, so that the block crystals located under the rolling wheel 801 are broken, and the block crystals located between the two rolling wheels 801 are vibrated and lifted, generating gaps, and loose crystals fall from the gaps, thereby crushing excessive or too hard block crystals and accelerating the falling of loose crystals, thereby ensuring drying efficiency.

[0076] By detecting the change in the compression amount of the crushing spring 804 in real time, the type of block crystals on the current screen plate 11 can be determined, and the crushing wheel 801 can be controlled to make corresponding adjustments to better crush the block crystals, thereby avoiding too many block crystals that are too hard and spread on the screen plate 11 to block the screen holes, making it difficult for loose crystals to fall smoothly.

[0077] When the rake 705 flips the crystal, no matter the drying plate 601 or the drying tray 602, the crystal ring diameter of the outer circle is larger than the crystal ring diameter of the inner circle. Therefore, the height of the crystal ring formed by the inner circle is higher than the height of the crystal ring formed by the outer circle, that is, the height of the crystal ring gradually decreases from the inside to the outside, which leads to uneven heat exchange of the crystal.

[0078] In order to solve the above technical problems, a laser measuring instrument is fixedly arranged on the bottom surface of the drying plate 601 and the drying tray 602 to measure the height of the crystal ring. When the laser measuring instrument detects that there is a difference in the height of the crystal ring on the drying plate 601 or the drying tray 602, the reverse current passed through the moving electromagnet 706 is increased, and the increased reverse current is in a decreasing mode from the inner moving electromagnet 706 to the outer side, so that the distance between the moving electromagnets 706 is in a decreasing mode, that is, the distance increase value between the two inner moving electromagnets 706 is the largest, and the distance increase value between the two outer moving electromagnets 706 is the smallest, so that the width of the inner crystal ring becomes wider and the height decreases until the height of the crystal ring is unified, and the adjustment of the distance of the moving electromagnets 706 is stopped to ensure the uniformity of the crystal ring height, facilitate uniform heat exchange, and accelerate the drying efficiency.

[0079] By setting a laser measuring instrument to measure the height of the crystal ring in real time, the spacing between the rakes 705 can be adjusted by changing the current passed through the moving electromagnet 706, so as to unify the height of the crystal ring, ensure the uniformity of drying, and ensure the drying efficiency.

[0080] Embodiment three:

[0081] The present invention also provides a sulfate removal process, comprising the above-mentioned dryer, comprising the following steps:

[0082] Step 1: Fix SO 2 , the SO generated during the production process 2 The gas is passed into the desulfurization circulation pool, and the deoxygenated circulating liquid absorbs SO 2 After forming Na 2 SO 3 , Na 2 SO 3 Accumulate until near saturation.

[0083] Step 2: Precipitation of Na 2 SO 4 , air is introduced into the circulating slurry through the oxidation fan to 2 SO 3 Oxidized to Na 2 SO 4 The temperature of the deoxygenated circulating fluid is lowered to 20 degrees by a refrigerator. 2 SO 4 Crystals precipitated.

[0084] Step 3: Separation of Na 2 SO 4 Crystals, containing Na 2 SO 4The circulating liquid of the crystals is pumped into the hydrocyclone, and the slurry containing the crystals is separated in the cyclone under the action of centrifugal force. The upper clear liquid flows back to the circulating slurry pool through overflow, and the lower turbid liquid enters the centrifuge for further separation.

[0085] Step 4: Further separation of Na 2 SO 4 The crystals and the lower turbid liquid are further separated in the centrifuge under the action of centrifugal force. The liquid flows back to the circulating slurry pool, and the solid flows to the dryer by itself.

[0086] Step 5: Drying Na 2 SO 4 Crystals, heat transfer oil is introduced into the drying component 6 in the dryer to dry the Na 2 SO 4 , dry Na 2 SO 4 The material is scraped to the discharge port 12 by the turning assembly 7 .

[0087] Drying Na 2 SO 4 The specific process of crystallization is as follows:

[0088] Step a: introducing heat transfer oil into the drying assembly 6 for preheating so that the temperature inside the tank assembly 1 remains uniform.

[0089] Step b: put the crystals to be dried into the feed hopper 3, and drive the blocking block 5 to rise and fall through the stirring component 4 to open the feed port, so that the crystals fall onto the drying component 6 for drying.

[0090] Step c: The flipping assembly 7 scrapes the crystals from the drying assembly 6 to the inner bottom of the tank assembly 1, and the dried crystals are discharged from the discharge port 12.

[0091] Step d: The water vapor generated by drying is extracted from the exhaust port 10.

[0092] Step 6: Packing Na 2 SO 4 Crystals, dry Na 2 SO 4 The crystals are transported to a semi-automatic packaging machine and packed into bags.

[0093] Finally, it should be noted that the above 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 aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dryer, characterized in that: The invention comprises a tank assembly (1), wherein a power assembly (2) is arranged on the central axis of the tank assembly (1), a feed hopper (3) is arranged on the top of the tank assembly (1), a stirring assembly (4) and a blocking block (5) are arranged inside the feed hopper (3), a drying assembly (6) is arranged inside the tank assembly (1), a turning assembly (7) and a rolling assembly (8) are evenly arranged on the power assembly (2), a cleaning assembly (9) is arranged on the turning assembly (7), a discharge port (12) is arranged at the bottom of the tank assembly (1), an exhaust port (10) is arranged on the top of the tank assembly (1), and a sieve plate (11) is evenly arranged on the drying assembly (6); The turning assembly (7) comprises a fixed plate (701), a rake rod (702) is arranged on one side of the fixed plate (701), movable plates (704) are evenly arranged 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 arranged on the rake blade (705); The rolling assembly (8) comprises a rolling wheel (801), a bending support plate (802) is arranged on the rolling wheel (801), a lifting column (805) is arranged on the top of the bending support plate (802), and a rolling spring (804) is arranged on the outer side of the lifting column (805).

2. A dryer according to claim 1, characterized in that: The cleaning assembly (9) comprises a parallel scraper (901), the parallel scraper (901) is slidably arranged on the rake (705), a permanent magnetic plate (902) is fixedly arranged on the top of the parallel scraper (901), and a bar-shaped electromagnet (903) is fixedly arranged on the top of the rake (705); A support spring (703) is provided at one end of the rake rod (702) away from the fixed plate (701), one end of the support spring (703) is fixedly connected to a movable plate (704) farthest from the fixed plate (701), and a movable electromagnet (706) is fixedly provided on the movable plate (704).

3. A dryer according to claim 1, characterized in that: The rolling assembly (8) is rotationally symmetrically arranged with the central axis of the tank assembly (1) as the center of the circle to form a rolling layer, and the rolling layer is evenly and equidistantly arranged. A support plate (803) is fixedly arranged on the fixed plate (701), and the lifting column (805) is passed through the support plate (803). One end of the rolling spring (804) is fixedly arranged on the bent support plate (802), and the other end is fixedly arranged on the support plate (803). The rolling wheel (801) is arranged in close contact with the screen plate (11).

4. A dryer according to claim 1, characterized in that: The drying assembly (6) comprises a drying plate (601) and a drying tray (602), wherein the drying plate (601) and the drying tray (602) are arranged in an interlaced manner, and both sides of the drying plate (601) and the drying tray (602) are provided with a flow pipe (603), and the other end of the flow pipe (603) is fixedly provided with a straight pipe (604), and any 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), and the straight pipe (604) is fixedly provided inside the tank assembly (1) via a fixing ring (605).

5. A dryer according to claim 4, characterized in that: The power assembly (2) comprises a rotating shaft (202), a motor (201) is fixedly arranged at the bottom end of the rotating shaft (202), and a deep groove (203) is formed at the top end of the rotating shaft (202); The drying plate (601) is rotatably arranged on the rotating shaft (202); a circular hole is arranged at the center of the drying plate (602); 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 plate (602).

6. A dryer according to claim 5, characterized in that: The stirring assembly (4) comprises a stirring shaft (401), the bottom end of the stirring shaft (401) is slidably arranged in the deep groove (203), the blocking block (5) is fixedly arranged on the stirring shaft (401), a stirring blade (402) is fixedly arranged on the stirring shaft (401), a telescopic cylinder (404) is fixedly connected to the top end of the stirring shaft (401), support columns (403) are 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).

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

8. A sulfate removal process, comprising the dryer according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Fix SO2. The SO2 gas generated in the production process is passed into the desulfurization circulation pool. The deoxygenated circulating liquid absorbs SO2 to form Na2SO3, which accumulates until it is nearly saturated. Step 2: precipitate Na2SO4. Air is introduced into the circulating slurry through an oxidation fan to oxidize Na2SO3 into Na2SO4. The temperature of the deoxygenated circulating liquid is lowered to 20 degrees through a refrigerator, and Na2SO4 crystals are precipitated. Step 3: Separate Na2SO4 crystals. The circulating liquid containing Na2SO4 crystals is pumped into a hydrocyclone through an ammonium sulfate pump. The slurry containing the crystals is separated in the hydrocyclone under the action of centrifugal force. The upper clear liquid is returned to the circulating slurry pool through overflow, and the lower turbid liquid enters the centrifuge for further separation. Step 4: Further separate the Na2SO4 crystals. The lower turbid liquid is further separated in the centrifuge under the action of centrifugal force. The liquid flows back to the circulating slurry pool, and the solid flows to the dryer by itself. Step 5: Drying Na2SO4 crystals: introducing heat transfer oil into the drying component (6) in the dryer to dry the Na2SO4 containing water; the dried Na2SO4 is scraped to the discharge port (12) by the turning component (7); Step 6: Pack the Na2SO4 crystals. Transport the dried Na2SO4 crystals to a semi-automatic packing machine and pack them into bags.

9. A sulfate removal process according to claim 8, characterized in that: Step five includes the following steps: Step a, introducing heat transfer oil into the drying component (6) for preheating, so that the temperature inside the tank component (1) remains uniform; Step b, putting the crystals to be dried into the feed hopper (3), and driving the blocking block (5) to rise and fall to open the feed inlet through the stirring component (4), so that the crystals fall onto the drying component (6) for drying; Step c, the flipping assembly (7) scrapes the crystals from the drying assembly (6) to the inner bottom of the tank assembly (1), and the dried crystals are discharged from the discharge port (12); Step d: The water vapor generated by drying is extracted from the exhaust port (10).

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