Potassium sulfate reaction furnace

Abstract

The application relates to a potassium sulfate reaction furnace, and belongs to the field of equipment for producing potassium sulfate through a Mannheim method. The potassium sulfate reaction furnace comprises a furnace body, a reaction chamber in the furnace body, a burner outside the reaction chamber and a stirring driving device outside the furnace body. The bottom surface of the reaction chamber is flat, a feeding pipe is connected to the top of the reaction chamber in a penetrating mode, a downward arranged discharging pipe is connected to the outside of the bottom surface of the reaction chamber in a penetrating mode, and a stirring structure is arranged in the reaction chamber. The stirring structure comprises a strip-shaped shell, a paddle and a regulation and control driving assembly. A plurality of interval arranged paddles are rotationally arranged below the shell. The regulation and control driving assembly comprises a rotating shaft and a regulation and control assembly, the rotating shaft is fixedly connected with the shell, and the regulation and control assembly is used for adjusting the angle of the paddle. The bottom surface of the reaction chamber is changed into a flat surface, the problem of uneven distribution of materials is solved from the root, and a more uniform environment is provided for the reaction.

Description

Technical Field

[0001] This application belongs to the field of equipment for producing potassium sulfate via the Mannheim process, and specifically relates to a potassium sulfate reactor. Background Technology

[0002] Potassium sulfate, as an important chlorine-free potassium fertilizer, is widely used in the cultivation of cash crops such as tobacco, fruit trees, and vegetables. Its purity and quality directly affect the yield and quality of these crops. Currently, the mainstream industrial process for producing potassium sulfate is the Mannheim process. This method involves the chemical reaction of sulfuric acid and potassium chloride under high-temperature conditions to produce potassium sulfate, with the core reaction equipment being the Mannheim process potassium sulfate reactor. The structural design of the potassium sulfate reactor, especially the material mixing and flow characteristics inside the reaction chamber, plays a decisive role in reaction efficiency, product purity, and production stability. Among the existing technical solutions for Mannheim process potassium sulfate reactors, the Chinese utility model patent "A Mannheim Process Potassium Sulfate Reactor" with authorization announcement number CN210683236U is representative. This patent discloses a reactor comprising a furnace body, a reaction chamber located inside the furnace body, a burner arranged outside the reaction chamber, and a stirring drive device located outside the furnace body. The reaction chamber is equipped with a stirring structure, and the stirring drive device drives the stirring structure to rotate via a transmission component, thereby achieving dynamic control of the mixing of sulfuric acid and potassium chloride within the reaction chamber and the reaction process. This patent improves the stability of equipment operation to a certain extent through optimization of the stirring structure and the furnace body sealing method. However, in the design of the bottom structure of the reaction chamber, it still continues the common design concept of traditional Mannheim process reactors—that is, the bottom surface of the reaction chamber is an arc-shaped surface that is high in the middle and low on the outer side, and the discharge pipe is connected to the lowest point of the arc-shaped edge. Existing technologies employ an "arc-shaped bottom surface that is high in the middle and low on the outer edges," primarily designed to facilitate natural material discharge in conjunction with a fixed-angle mixing structure. Since the angle of the paddles or rake teeth in traditional mixing structures cannot be adjusted, it's impossible to actively change the mixing direction to propel the material towards the discharge port. Therefore, the slope of the arc-shaped bottom surface is relied upon to allow the material to naturally converge towards the lower edge of the discharge pipe under gravity, thus completing the discharge process. However, while this bottom surface design meets the discharge requirements, it significantly restricts the uniformity of material mixing. From a theoretical perspective, the main problems are as follows: First, the "high in the middle and low on the outside" slope of the curved bottom surface causes an "edge aggregation effect" in the materials under the influence of gravity. During the reaction, solid and semi-solid materials, such as unreacted potassium chloride particles and the generated potassium sulfate product, tend to slide and accumulate towards the lower edge due to the slope of the curved bottom surface, while the material in the middle area of ​​the reaction chamber is relatively thin, resulting in an uneven distribution of "excessively thick material at the edges and insufficiently thin material in the middle". This distribution difference leads to a significant gradient in material concentration and temperature in different areas of the reaction chamber. The material accumulated at the edges may experience localized overheating due to slower heat dissipation, while the material in the thinner middle area may experience incomplete reaction due to insufficient contact with the reactants, ultimately affecting the purity and uniformity of the potassium sulfate product. Secondly, the combination of a fixed-angle stirring structure and a curved bottom surface leads to uneven mixing forces on the materials. In traditional stirring structures, the fixed angle of the paddles causes the distance between the paddles and the bottom surface to vary with the radius of rotation when rotating on the curved bottom surface. This results in a "weak in the middle, strong at the edges" mixing force: the materials in the middle area are insufficiently agitated and mixed; while the materials at the edges experience greater mixing forces, the thick accumulation of material means the mixing force only acts on the surface layer, leaving the bottom layer relatively stationary, creating a "mixing blind zone." This uneven mixing force further exacerbates the incomplete mixing, leading to delayed reactions in some areas and even the residue of unreacted raw materials, thus reducing the purity of the potassium sulfate product. In summary, the existing Mannheim process potassium sulfate reactor with authorization announcement number CN210683236U and other technical solutions using a "high center and low outer arc-shaped bottom" can achieve material discharge through gravity assistance. However, in principle, the material edge aggregation, uneven stirring force, and restricted circulation caused by the arc-shaped bottom are significantly detrimental to the uniform mixing of materials, becoming a key technical bottleneck restricting the improvement of product purity in the Mannheim process potassium sulfate reactor. Utility Model Content

[0003] The technical problem to be solved by this application is to overcome the shortcomings of the prior art and provide a potassium sulfate reactor. The bottom surface of the reaction chamber of this application is changed to a planar shape, which solves the problem of uneven material distribution from the root and provides a more uniform environment for the reaction.

[0004] The technical solution adopted by this application to solve its existing problems is: A potassium sulfate reactor includes a furnace body, a reaction chamber inside the furnace body, a burner outside the reaction chamber, and a stirring drive device outside the furnace body. The bottom surface of the reaction chamber is planar, a feed pipe is connected through the top of the reaction chamber, a discharge pipe is connected through the outer side of the bottom surface of the reaction chamber, and a stirring structure is provided inside the reaction chamber.

[0005] The stirring structure includes a long strip-shaped shell, a paddle, and a control drive assembly.

[0006] Several spaced-apart paddles are rotatably mounted below the shell.

[0007] The control drive assembly includes a rotating shaft and a control component. The rotating shaft is fixedly connected to the housing, and the control component is used to adjust the angle of the paddle.

[0008] Furthermore, the reaction chamber has a through-hole on the outer side of its bottom surface, which extends from the bottom surface of the reaction chamber to the side wall. A discharge chamber is provided outside the reaction chamber to house the through-hole, and the discharge pipe is connected to the bottom of the discharge chamber.

[0009] The discharge chamber is equipped with a sliding block plate that blocks the through-hole of the reaction chamber. After the block plate is blocked, the inner wall of the block plate is aligned with the inner wall of the reaction chamber.

[0010] A telescopic drive device is fixed to the outside of the furnace body, and the telescopic rod of the telescopic drive device is fixedly connected to the blocking plate.

[0011] Furthermore, a heat exchange box is fixed on the shell, and the inside of the rotating shaft is a cavity. The cavity is divided into an inlet chamber and an outlet chamber by a partition. The outer wall of the rotating shaft located outside the furnace body is provided with an inlet port that is connected to the inlet chamber and an outlet port that is connected to the outlet chamber. The top of the inlet chamber is connected to the heat exchange box through a first connecting pipe, and the outlet chamber is connected to the heat exchange box through a second connecting pipe.

[0012] The shaft is fitted with three sealing rings. The inlet and outlet are respectively located in two interval areas formed by the three sealing rings. The outlet collection pipe and the inlet collection pipe are respectively fitted outside the two interval areas.

[0013] The liquid inlet collection pipe is connected to the liquid inlet, and an external liquid inlet pipe is also connected.

[0014] The liquid collection pipe is connected to the liquid outlet, and an external liquid outlet pipe is also connected.

[0015] Furthermore, the control components include a rack, a sleeve, and a rotary drive device.

[0016] The top of the paddle is fixedly connected to a gear via a connecting shaft. The gear is located inside the housing, and the rack is slidably located inside the housing, meshing with all the gears.

[0017] The sleeve is fitted onto the rotating shaft, with the top of the sleeve extending into the interior of the housing and fixed with a gear ring, which meshes with a rack.

[0018] The rotary drive device is used to drive the sleeve to rotate relative to the shaft.

[0019] Furthermore, the rotary drive device includes a lifting mechanism, a collar, and a ball head fixedly connected to the inner side of the collar via a connecting rod.

[0020] The bottom of the sleeve is provided with a thickened tube, and the outside of the thickened tube is recessed with a curved groove arranged from bottom to top. The ball head is slidably disposed inside the curved groove.

[0021] The lifting mechanism drives the collar to move up and down.

[0022] Furthermore, the lifting mechanism includes a fixed plate, a screw, and a servo motor. The fixed plate is sleeved on the rotating shaft below the sleeve, the servo motor is fixedly connected to the fixed plate, and the vertically arranged screw is connected to the output end of the servo motor.

[0023] The collar is provided with a threaded hole, and the screw passes through the threaded hole and the two are threadedly connected.

[0024] Furthermore, a vertically arranged guide rod is fixed on the fixing plate, and the guide rod passes through the through hole on the collar.

[0025] Furthermore, two ball heads are fixed on the inner side of the collar and arranged symmetrically around its axis, and two curved grooves are recessed on the outer wall of the thickened tube.

[0026] Furthermore, the inner wall of the housing is provided with a protruding plate, and the end face of the rack is provided with a recessed groove, which is engaged with the protruding plate.

[0027] Compared with the prior art, the beneficial effects of this application are as follows: (1) In the prior art, the bottom surface of the reaction chamber is arc-shaped, which facilitates material discharge but leads to uneven material distribution and affects the reaction effect. This solution changes the bottom surface of the reaction chamber to a flat surface, which solves the problem of uneven material distribution from the root and provides a more uniform environment for the reaction. At the same time, through the design of the blocking plate in the discharge chamber, the sealing is consistent with the inner wall of the reaction chamber, avoiding the interference of structural protrusions on material flow and mixing, further ensuring the sufficiency of the reaction, and ultimately improving the purity of the potassium sulfate product.

[0028] (2) The paddle angle can be flexibly and precisely adjusted by controlling the drive assembly, which can optimize the stirring effect for different production conditions. When the viscosity of the material is low in the early stage of the reaction, the paddle angle is adjusted to make the angle between it and the rotation direction small to reduce stirring resistance and avoid material splashing; when the viscosity of the material is high in the middle and late stages of the reaction, the paddle angle is adjusted to make the angle larger to enhance the pushing force and shearing force, prevent material accumulation, and ensure uniform stirring.

[0029] (3) By driving the screw with a servo motor and combining the ball head with the curved slide, the angle of the paddle plate can be accurately positioned, which solves the problem that ordinary lifting mechanisms cannot be accurately adjusted, so that the stirring direction and effect can be flexibly matched according to actual needs, and improves the adaptability and reliability of the stirring system.

[0030] (4) A detachable heat exchange box is installed on the shell of the stirring structure. The inside of the rotating shaft is divided into an inlet chamber and an outlet chamber by a partition. The heat transfer medium circulates between the chambers of the heat exchange box and the rotating shaft to absorb the excess heat energy generated during the reaction. The heat energy is connected to an external heat exchange or storage device through the inlet and outlet collection pipes to realize the recovery and reuse of heat energy, reduce energy waste, and improve the overall energy efficiency of production. Attached Figure Description

[0031] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0032] Figure 1 This is a first cross-sectional view of a potassium sulfate reactor according to this application. Figure 2 This is a second cross-sectional view of a potassium sulfate reactor according to this application. Figure 3 This is a structural diagram of the stirring structure in the stirring configuration. Figure 4 for Figure 3 A partial sectional view, Figure 5 for Figure 4 Enlarged view of a portion of point A in the middle. Figure 6 This is a diagram of the stirring paddle structure in the mixing system. Figure 7 This is a diagram of the rack and pinion structure in the stirring mechanism. Figure 8 This is a structural diagram of the control drive assembly in the stirring structure. Figure 9 for Figure 8 sectional view, Figure 10 This is a structural diagram of the rotating shaft assembly in the stirring structure. Figure 11 for Figure 10 Sectional view, Figure 12 This is a diagram of the sleeve structure in the stirring mechanism. Figure 13 This is a diagram of the ring structure in the stirring mechanism.

[0033] In the diagram: 1-Shell, 101-Protruding plate, 2-Paddle plate, 201-Connecting shaft, 202-Gear, 3-Rack, 301-Groove, 4-Rotating shaft, 401-Bottom fixing flange, 402-Top fixing flange, 403-Baffle plate, 404-Liquid inlet chamber, 405-Liquid inlet, 406-Liquid outlet chamber, 407-Liquid outlet, 408-Sealing retaining ring, 5-Sleeve, 501-Gear ring, 502-Thickened tube, 503-Curved groove, 6-Ball head, 601-Connecting rod, 7- 8-Fixing plate, 9-Screw, 10-Servo motor, 11-Guide rod, 12-Liquid outlet collection pipe, 1201-Liquid outlet pipe, 13-Liquid inlet collection pipe, 1301-Liquid inlet pipe, 14-First connecting pipe, 15-Second connecting pipe, 16-First heat exchange box, 17-Second heat exchange box, 18-Third connecting pipe, 19-Reaction chamber, 1901-Feed pipe, 1902-Discharge chamber, 1903-Discharge pipe, 20-Blocking plate, 21-Telescopic drive device, 22-Furnace body. Detailed Implementation

[0034] The attached figure shows the preferred embodiment of this potassium sulfate reactor. The following is a more detailed description of this application in conjunction with the attached figure.

[0035] Depend on Figures 1 to 13 As shown, a potassium sulfate reactor includes a furnace body 22, a reaction chamber 19 inside the furnace body 22, a burner outside the reaction chamber 19, and a stirring drive device outside the furnace body 22. The reaction chamber 19 is equipped with a stirring structure, and the stirring drive device drives the stirring structure to rotate. The above structure, its arrangement, and interconnections all adopt existing technology; a reference can be made to a Mannheim process potassium sulfate reactor with authorization publication number CN210683236U.

[0036] The bottom surface of the reaction chamber 19 is planar. A feed pipe 1901 is connected through the top of the reaction chamber 19, and a discharge pipe 1903 is connected through the outer side of the bottom surface of the reaction chamber 19, which is arranged downwards. In this embodiment, a through opening is provided on the outer side of the bottom surface of the reaction chamber 19, extending from the bottom surface of the reaction chamber 19 to the side wall. A discharge chamber 1902 is provided outside the reaction chamber 19 to cover the through opening, and the discharge pipe 1903 is connected through the bottom of the discharge chamber 1902.

[0037] The discharge chamber 1902 is equipped with a sliding block plate 20, which blocks the through opening of the reaction chamber 19. After the block plate 20 is blocked, the inner wall of the block plate 20 is consistent with the inner wall of the reaction chamber 19.

[0038] A telescopic drive device 21 is fixed to the outside of the furnace body 22. The telescopic rod of the telescopic drive device 21 is fixedly connected to the blocking plate 20. The telescopic drive device 21 can be an electric telescopic rod or a pneumatic telescopic rod.

[0039] The stirring structure includes a long strip-shaped shell 1, a paddle 2, and a control drive assembly; several paddles 2 arranged at intervals are rotatably disposed below the shell 1; the control drive assembly includes a rotating shaft 4 and a control component, the rotating shaft 4 being fixedly connected to the shell 1, and the control component being used to adjust the angle of the paddles 2.

[0040] In existing technologies, the bottom surface of the reaction chamber is curved, higher in the middle and lower at the edges, with the discharge pipe connected to the lowest point of the curved edge. This is because the angle of the paddles or rake teeth of the stirring mechanism in existing technologies cannot be adjusted, allowing material to be discharged through the curvature of the reaction chamber's bottom surface. This arrangement is primarily for material discharge considerations; however, the curved bottom surface leads to uneven material distribution within the reaction chamber, which in turn affects the reaction efficiency and reduces the purity of the reaction product, potassium sulfate.

[0041] In order to ensure the mixing effect and uniform material distribution, the bottom surface of the reaction chamber 19 is set to be flat. During the discharge process after the reaction, the blocking plate 20 moves outward, opening the through-hole between the reaction chamber 19 and the discharge chamber 1902. The flow direction of the material is changed by adjusting the angle of the stirring structure paddle 2, and the material is pushed into the discharge chamber 1902 in sequence, and then discharged through the discharge pipe 1903.

[0042] The stirring structure inside the reaction chamber 19 includes a long strip-shaped shell 1, a paddle 2, and a control drive assembly.

[0043] The housing 1 is composed of two parts, upper and lower, which are fixedly connected by bolts.

[0044] Several spaced-apart paddles 2 are rotatably disposed below the housing 1. The paddles 2 are arc-shaped plates, and a gear 202 is fixedly connected to the top of the plate via a connecting shaft 201. The gear 202 is rotatably disposed inside the housing 1.

[0045] The control drive assembly includes a rotating shaft 4 and a control component. The rotating shaft 4 is fixedly connected to the housing 1, and the control component is used to adjust the angle of the paddle 2.

[0046] The control assembly includes a rack 3, a sleeve 5, and a rotary drive device; The rack 3 is slidably disposed inside the housing 1. In order to limit its movement and make it slide only along a predetermined path, in this embodiment, the inner wall of the housing 1 is provided with a protruding plate 101, and the end face of the rack 3 is provided with a recessed groove 301. The groove 301 is engaged with the protruding plate 101, and the rack 3 is meshed with all the gears 202 inside the housing 1.

[0047] The sleeve 5 is coaxially sleeved on the rotating shaft 4, and the top of the sleeve 5 passes through the inside of the housing 1 and is fixed with a toothed ring 501, which meshes with the rack 3.

[0048] The rotary drive device is used to drive the sleeve 5 to rotate relative to the rotating shaft 4.

[0049] To achieve a fixed connection between the rotating shaft 4 and the housing 1 without affecting the arrangement of the gear ring 501, in this embodiment, a top fixing flange 402 is provided at the top of the rotating shaft 4, extending above the outside of the housing 1. The top fixing flange 402 is fixedly connected to the top surface of the housing 1 by bolts. A bottom fixing flange 401 is provided at the bottom of the rotating shaft 4, and the bottom fixing flange 401 is connected to the output end of the stirring drive device that drives the stirring structure of the Mannheim furnace by a coupling or bolts.

[0050] The rotary drive device includes a lifting mechanism, a collar 7, and a ball head 6 fixedly connected to the inner side of the collar 7 via a connecting rod 601.

[0051] The sleeve 5 has a thickened tube 502 at the bottom, and the thickened tube 502 has a curved groove 503 arranged from bottom to top on the outside. The ball head 6 is slidably disposed inside the curved groove 503.

[0052] The lifting mechanism drives the collar 7 to move up and down, thereby changing the height of the ball head 6. Since the ball head 6 slides inside the curved groove 503, the change in the height of the ball head 6 can cause the thickened tube 502, the sleeve 5, and the gear ring 501 to rotate relative to the rotating shaft 4. The rotation of the gear ring 501 causes the rack 3 to move, which in turn causes the gear 202 to rotate. The rotation of the gear 202 causes the propeller 2 to rotate, changing the angle of the propeller 2.

[0053] By changing the angle of the paddle 2, the stirring direction and effect of the material inside the Mannheim furnace can be changed, thus better matching different working conditions.

[0054] In order to optimize the driving effect of the ball head 6 on the thickened tube 502 when it moves, in this embodiment, two ball heads 6 are fixed inside the collar 7 and arranged symmetrically around its axis, and two curved grooves 503 are recessed on the outer wall of the thickened tube 502.

[0055] If a conventional lifting mechanism, such as an electric cylinder, electromagnet, or hydraulic cylinder, is used, the position of the ball head 6 cannot be precisely positioned, thus making it impossible to accurately adjust the rotation angle of the gear ring 501. To achieve precise adjustment of the rotation angles of the gear ring 501 and the paddle plate 2, in this embodiment, the lifting mechanism includes a fixed plate 8, a screw 9, and a servo motor 10. The fixed plate 8 is sleeved on the rotating shaft 4 below the sleeve 5, and the fixed plate 8 is fixedly connected to the rotating shaft 4. A rechargeable and replaceable battery module can be fixed on the fixed plate 8 to power the servo motor 10.

[0056] The servo motor 10 is fixedly connected to the fixed plate 8, and the vertically arranged screw 9 is connected to the output end of the servo motor 10.

[0057] The collar 7 has a threaded hole, through which the screw 9 passes and is threadedly connected. A vertically arranged guide rod 11 is fixed on the fixing plate 8, and the guide rod 11 passes through a through hole in the collar 7.

[0058] The servo motor 10 can precisely control the number of rotations, thus enabling precise adjustment of the height of the ball head 6.

[0059] The reaction process for preparing potassium sulfate using the Mannheim process is exothermic and involves high temperatures. To recover some of the excess heat energy, in this embodiment, a detachable heat exchange box is fixed to the shell 1. The rotating shaft 4 has an internal cavity, which is divided into an inlet chamber 404 and an outlet chamber 406 by a partition 403. The outer wall of the rotating shaft 4, located outside the furnace body 22, has an inlet port 405 connected to the inlet chamber 404 and an outlet port 407 connected to the outlet chamber 406. The top of the inlet chamber 404 is connected to the heat exchange box via a first connecting pipe 14, and the outlet chamber 406 is connected to the heat exchange box via a second connecting pipe 15.

[0060] The rotating shaft 4 is fitted with three sealing rings 408. The liquid inlet 405 and the liquid outlet 407 are respectively located in two interval areas formed by the three sealing rings 408. The liquid outlet collection pipe 12 and the liquid inlet collection pipe 13 are respectively fitted outside the two interval areas.

[0061] The liquid inlet collecting pipe 13 is connected to the liquid inlet 405 and is externally connected to the liquid inlet pipe 1301; the liquid outlet collecting pipe 12 is connected to the liquid outlet 407 and is externally connected to the liquid outlet pipe 1201. The liquid inlet pipe 1301 and the liquid outlet pipe 1201 are connected to an external heat exchange device or thermal energy storage device.

[0062] The heat exchanger contains heat transfer oil and other heat transfer media. In order to plan the flow path of the heat transfer media, in this embodiment, the heat exchanger uses a first heat exchanger 16 and a second heat exchanger 17, which are respectively arranged on both sides of the rotating shaft 4. They are respectively connected to the first connecting pipe 14 and the second connecting pipe 15. The ends of the two heat exchangers that are away from the first connecting pipe 14 or the second connecting pipe 15 are connected by a third connecting pipe 18.

[0063] During production, the angle of paddle 2 is adjusted as follows: During basic mixing: A stirring drive device connected to the rotating shaft 4 via a bottom fixed flange 401 is operated, driving the rotating shaft 4 to rotate. Since the rotating shaft 4 is fixed to the housing 1 via a top fixed flange 402, the housing 1 rotates synchronously with the rotating shaft 4. The paddle 2 below the housing 1 rotates together with the housing 1, stirring the potassium sulfate material in the Mannheim furnace through the arc-shaped plate structure, thereby achieving mixing and agitation of the material.

[0064] Activate paddle angle adjustment as needed when adjusting the stirring direction or effect to match operating conditions: Servo motor 10 starts, driving screw 9 to rotate. Because screw 9 engages with the threaded hole of collar 7, and collar 7 is limited by guide rod 11, it can only move up and down. Collar 7 moves vertically up and down along guide rod 11. Ball head 6 on the inner side of collar 7 moves up and down synchronously with collar 7, sliding within the curved groove 503 of thickened tube 502 at the bottom of sleeve 5. Because curved groove 503 is a curved structure arranged from bottom to top, the height change of ball head 6 forces thickened tube 502 and sleeve 5 to rotate relative to shaft 4. Gear ring 501 at the top of sleeve 5 rotates synchronously with sleeve 5, meshing with rack 3, causing rack 3 to slide horizontally along the protrusion 101 on the inner wall of housing 1 through groove 301.

[0065] The rack 3 meshes with the gears 202 on the top of all the paddles 2. The rack 3 slides, causing the gears 202 to rotate, which in turn drives the paddles 2 to rotate through the connecting shaft 201, thereby adjusting the angle of the paddles 2. The servo motor 10 precisely controls the number of rotations to achieve precise adjustment of the height of the ball head 6, ultimately completing the precise positioning of the angle of the paddles 2.

[0066] By adjusting the angle of paddle 2, the stirring direction and effect can be changed, making it suitable for the following different operating conditions in potassium sulfate production: When the viscosity of the material is high, such as in the middle and later stages of the reaction, the material tends to be solid or semi-solid: Adjust the angle of the paddle 2 so that its arc surface forms a large angle with the direction of rotation, close to perpendicular, to enhance the pushing and shearing force of the paddle on the material, avoid material accumulation, and ensure uniform mixing.

[0067] When the material viscosity is low, such as in the early stage of the reaction, the material is in a liquid or thin paste state: adjust the angle of the paddle 2 so that its arc surface forms a small angle with the direction of rotation, close to parallel, to reduce stirring resistance, avoid excessive splashing of material, and at the same time ensure a light mixing effect.

[0068] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A potassium sulfate reactor, comprising a furnace body (22), a reaction chamber (19) inside the furnace body (22), a burner outside the reaction chamber (19), and a stirring drive device outside the furnace body (22), characterized in that: The bottom surface of the reaction chamber (19) is planar. A feed pipe (1901) is connected through the top of the reaction chamber (19). A discharge pipe (1903) is connected through the outside of the bottom surface of the reaction chamber (19). A stirring structure is provided inside the reaction chamber (19). The stirring structure includes a long strip-shaped shell (1), a paddle (2), and a control drive assembly; Several spaced-apart paddles (2) are rotatably positioned below the housing (1); The control drive assembly includes a rotating shaft (4) and a control component. The rotating shaft (4) is fixedly connected to the housing (1), and the control component is used to adjust the angle of the paddle (2).

2. A potassium sulfate reactor according to claim 1, characterized in that: The reaction chamber (19) has a through opening on the outer side of its bottom surface. The through opening extends from the bottom surface of the reaction chamber (19) to the side wall. A discharge chamber (1902) is provided outside the reaction chamber (19) to house the through opening. The discharge pipe (1903) is connected to the bottom of the discharge chamber (1902). The discharge chamber (1902) is equipped with a sliding block plate (20), which blocks the through opening of the reaction chamber (19). After the block is blocked, the inner wall of the block plate (20) is consistent with the inner wall of the reaction chamber (19). The furnace body (22) is fixed with a telescopic drive device (21), and the telescopic rod of the telescopic drive device (21) is fixedly connected to the blocking plate (20).

3. A potassium sulfate reactor according to claim 1, characterized in that: A heat exchange box is fixed on the shell (1). The inside of the rotating shaft (4) is a cavity. The cavity is divided into an inlet chamber (404) and an outlet chamber (406) by a partition (403). The outer wall of the rotating shaft (4) located outside the furnace body (22) is provided with an inlet port (405) that is connected to the inlet chamber (404) and an outlet port (407) that is connected to the outlet chamber (406). The top of the inlet chamber (404) is connected to the heat exchange box through a first connecting pipe (14), and the outlet chamber (406) is connected to the heat exchange box through a second connecting pipe (15). The rotating shaft (4) is fitted with three sealing rings (408). The inlet (405) and outlet (407) are respectively located in two interval areas formed by the three sealing rings (408). The outlet collection pipe (12) and the inlet collection pipe (13) are respectively fitted outside the two interval areas. The liquid inlet collection pipe (13) is connected to the liquid inlet (405), and the external liquid inlet pipe (1301) is connected. The liquid collection pipe (12) is connected to the liquid outlet (407), and the external liquid outlet pipe (1201) is connected.

4. A potassium sulfate reactor according to claim 1, 2, or 3, characterized in that: The control components include a rack (3), a sleeve (5), and a rotary drive device; The top of the paddle (2) is fixedly connected to a gear (202) via a connecting shaft (201). The gear (202) is located inside the housing (1). The rack (3) is slidably located inside the housing (1). The rack (3) meshes with all the gears (202). The sleeve (5) is sleeved on the rotating shaft (4), and the top of the sleeve (5) extends into the inside of the housing (1) and is fixed with a toothed ring (501). The toothed ring (501) meshes with the rack (3). The rotary drive device is used to drive the sleeve (5) to rotate relative to the shaft (4).

5. A potassium sulfate reactor according to claim 4, characterized in that: The rotary drive device includes a lifting mechanism, a collar (7), and a ball head (6) fixedly connected to the inner side of the collar (7) by a connecting rod (601). The sleeve (5) is provided with a thickened tube (502) at the bottom, and the thickened tube (502) is provided with a curved groove (503) arranged from bottom to top on the outside. The ball head (6) is slidably disposed inside the curved groove (503). The lifting mechanism drives the collar (7) to move up and down.

6. A potassium sulfate reactor according to claim 5, characterized in that: The lifting mechanism includes a fixed plate (8), a screw (9) and a servo motor (10). The fixed plate (8) is sleeved on the rotating shaft (4) below the sleeve (5). The servo motor (10) is fixedly connected to the fixed plate (8). The vertically arranged screw (9) is connected to the output end of the servo motor (10). The collar (7) is provided with a threaded hole, and the screw (9) passes through the threaded hole and the two are threadedly connected.

7. A potassium sulfate reactor according to claim 6, characterized in that: A vertically arranged guide rod (11) is fixed on the fixing plate (8), and the guide rod (11) passes through the through hole on the collar (7).

8. A potassium sulfate reactor according to claim 7, characterized in that: The inner side of the collar (7) is fixed with two ball heads (6) arranged symmetrically around its axis, and the outer wall of the thickened tube (502) is provided with two curved grooves (503).

9. A potassium sulfate reactor according to any one of claims 5 to 8, characterized in that: The inner wall of the housing (1) is provided with a protruding plate (101), and the end face of the rack (3) is provided with a recessed groove (301), which is engaged on the protruding plate (101).

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