Pre-liming barrel capable of preventing sand accumulation

Abstract

The invention provides a sand accumulation prevention preliming barrel which comprises a barrel body, an upper stirring device and a lower stirring device, the upper stirring device and the lower stirring device are arranged in the barrel body and used for mixing mother liquor and lime milk, the upper stirring device comprises a transmission shaft extending into the barrel body and a plurality of upper stirring impellers detachably connected with the transmission shaft, and the lower stirring device is arranged at the bottom of the barrel body. The lower stirring device comprises a lower stirring impeller rotationally connected to the bottom wall of the barrel body, the rotating direction of the lower stirring impeller enables the medium to be turned over upwards, and the barrel body is provided with a mother liquor inlet allowing mother liquor to enter, a lime milk inlet allowing lime milk to enter and a sand liquor outlet for outputting mixed liquor formed after the mother liquor and the lime milk are mixed. According to the sand accumulation prevention preliming barrel, through mutual cooperation of the upper stirring device and the lower stirring device, the stirring effect is improved, and meanwhile the accumulation speed of sand grains at the bottom of the barrel is reduced.

Description

Technical Field

[0001] The present application belongs to the field of alkali production by ammonia-soda process, and specifically relates to a pre-ash barrel for preventing sand accumulation. Background Art

[0002] In the ammonia-soda process, the main function of the pre-ash barrel is to fully mix and react the preheated mother liquor (mainly NH4Cl) in the distillation tower with the lime milk, so that the bound ammonium in it becomes free ammonia, and then it is sent back to the distillation tower to distill out the free ammonia. It can be seen that the stable operation of the pre-ash barrel is a key device to ensure the working efficiency of the distillation tower.

[0003] However, due to its special working environment: 1. In the pre-ash barrel, the calcium ions in the lime milk are easily combined with other anions to form scars on the blades, affecting the mixing efficiency; 2. The lime milk contains sand impurities. At the same time, in order to prevent the pre-ash barrel from vibrating, the speed of the stirring shaft cannot be too fast, which causes some sand to not be discharged in time with the blending liquid, causing siltation at the bottom of the barrel and blocking the liquid outlet. This results in the traditional pre-ash barrel having low mixing intensity, short operating cycle, and difficulty in cleaning and maintenance, which affects the subsequent process.

[0004] Chinese patent CN106984216A discloses a novel pre-ash barrel stirring device, comprising a barrel body, a stirring shaft axially inserted in the barrel body, and a stirring device arranged in the barrel body, wherein the stirring device comprises a paddle-type stirrer and a frame-type stirrer axially sleeved on the stirring shaft up and down, and a plurality of blocks arranged on the inner wall of the barrel body, wherein the paddle-type stirrer comprises a plurality of stirring paddles sleeved on the stirring shaft at intervals up and down, and the diameters of the upper and lower adjacent stirring paddles are different, wherein the blocks are arranged on the inner wall of the barrel body at positions corresponding to the paddle-type stirrer, and the frame-type stirrer comprises a stirring frame sleeved on the lower part of the stirring shaft. The stirring paddle and the stirring shaft in the pre-ash barrel stirring device cannot be disassembled, and when the stirring paddle is scarred, the stirring paddle cannot be replaced in time, which affects the stirring effect.

[0005] Chinese patent CN114917796A discloses a sliding pre-ash barrel high-efficiency mixing device, including a base frame, a pre-ash barrel, a feed pipe, a protective shell, a stirring mechanism and an extraction mechanism. The upper inner part of the base frame is connected to the pre-ash barrel by bolts, the upper right part of the pre-ash barrel is connected to the feed pipe by bolts, and the top of the pre-ash barrel is connected to the protective shell by bolts. The stirring mechanism includes a first bracket, a motor, a stirring shaft and a stirring paddle. The top of the protective shell is connected to the first bracket by bolts, the first bracket is connected to the motor, the motor output shaft is connected to the stirring shaft, the stirring shaft passes into the pre-ash barrel, and the lower part of the stirring shaft is connected to two stirring paddles. The sliding pre-ash barrel high-efficiency mixing device cannot stir the preheated mother liquor and lime milk at the lower part of the pre-ash barrel, and some sand impurities gradually accumulate at the discharge port of the pre-ash barrel, forming a blockage. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a sand accumulation prevention pre-ash barrel, which improves the stirring effect and slows down the accumulation speed of sand particles at the bottom of the barrel through the cooperation of two specially designed upper and lower stirring devices.

[0007] The technical solution adopted by the present invention is as follows: A pre-ash barrel for preventing sand accumulation comprises a barrel body, an upper stirring device and a lower stirring device which are arranged in the barrel body and are used to mix mother liquor and ash emulsion, the upper stirring device comprising a transmission shaft extending to the inside of the barrel body and a plurality of upper stirring impellers detachably connected to the transmission shaft, the lower stirring device is arranged at the bottom of the barrel body, the lower stirring device comprises a lower stirring impeller rotatably connected to the bottom wall of the barrel body, the rotation direction of the lower stirring impeller is such that the medium turns upward during rotation to reduce sand deposition, the barrel body is provided with a mother liquor inlet for mother liquor to enter, an ash emulsion inlet for ash emulsion to enter, and a sand liquid outlet for outputting a blending liquid formed by mixing the mother liquor and the ash emulsion.

[0008] Furthermore, the upper stirring device also includes a reduction motor for driving the transmission shaft to rotate and a support frame for supporting and fixing the transmission shaft. The reduction motor is fixed to the top of the barrel body, and the power output end of the reduction motor is connected to the transmission shaft. A first through hole is opened on the top of the barrel body for the transmission shaft to extend out, and the top of the transmission shaft extends out of the first through hole and is connected to the reduction motor. The support frame is connected to the bottom end of the transmission shaft. The support frame includes a first bearing connected to the bottom end of the transmission shaft, an outer ring fixedly connected to the inner wall of the cylinder, and a plurality of support rods connected between the first bearing and the outer ring and distributed in a divergent shape. The support frame is arranged above the sand liquid outlet.

[0009] Furthermore, multiple upper stirring impellers are arranged at basically equal intervals along the axial direction of the transmission shaft. There may be at least two stirring impellers, for example, 3 or 4. The rotation direction of the topmost upper stirring impeller is different from that of the remaining upper stirring impellers. The rotation direction of the topmost upper stirring impeller causes the medium to flip downward, and the rotation direction of the remaining upper stirring impellers causes the medium to flip upward.

[0010] Furthermore, each upper stirring impeller includes a wheel shaft fixedly connected to the transmission shaft, a plurality of blades evenly distributed along the circumference of the wheel shaft, and a wheel shaft cover for fixing the blades to the wheel shaft. The wheel shaft is a straight cylinder. The transmission shaft passes through the wheel shaft and is fixedly connected to the inner wall of the wheel shaft. The top of the wheel shaft is provided with a plurality of fan-shaped grooves, which are evenly distributed along the circumference. The wheel shaft is provided with a plurality of T-shaped grooves. The T-grooves and fan-shaped grooves are alternately distributed in sequence. The T-grooves are blind grooves, each T-groove is connected to a blade, and the depth direction of the T-groove is the same as the axial direction of the transmission shaft. The T-groove includes a flange groove portion and a belly groove portion that are connected to each other. The flange groove portion forms openings on the top surface and side surfaces of the wheel axle, and the belly groove portion forms an opening on the top surface of the wheel axle. A plurality of first threaded holes are opened on the wheel axle between adjacent fan-shaped grooves, and first threaded holes are set on both sides of the T-groove. The wheel axle cover includes an arc-shaped cover covering the top surface of the wheel axle and a limit plate fixed on both sides of the arc-shaped cover and protruding downward. The two limit plates are respectively inserted into two adjacent fan-shaped grooves for matching and fixing. A second threaded hole corresponding to the position of the first threaded hole is opened on the arc-shaped cover. The blade includes a T-block inserted into the T-groove and a blade connected to the T-block. The T-block and the T-groove are transitionally matched, and the T-block is inserted into the T-groove to position the blade.

[0011] Furthermore, a boss facing the inside of the barrel body is formed at the bottom of the barrel body, and a second through hole for a transmission shaft driving the lower stirring impeller to pass through is opened at the center of the boss.

[0012] Furthermore, a convex groove is opened on the inner side of the lower stirring impeller, and the opening of the convex groove faces downward. The convex groove includes an upper groove body and a lower groove body. The upper groove body and the lower groove body are both circular grooves. The inner diameter of the upper groove body is smaller than the inner diameter of the lower groove body. A permanent magnet is fixed on the groove wall of the lower groove body. The rotation direction of the lower stirring impeller is the same as that of the upper stirring impeller at the lower end of the upper stirring device.

[0013] Furthermore, the lower stirring device also includes a sealing cover fixed on the bottom boss of the barrel body and connected to the lower stirring impeller (connected to the lower stirring impeller through a male bearing installed in the upper groove body of the convex groove of the lower stirring impeller), an external magnetic transmission shaft extending into the sealing cover from below the bottom surface of the barrel body, an external magnet fixed to the top of the external magnetic transmission shaft (the external magnet surrounds and covers the outer periphery of the top of the external magnetic transmission shaft), a sleeve coupling connected to the end of the external magnetic transmission shaft away from the bottom of the barrel body, and an isolation cover for fixing the external magnetic transmission shaft to the barrel body (the bottom of the barrel body and outside the barrel body cavity), and the end of the sleeve coupling that is not connected to the external magnetic transmission shaft (i.e., the end close to the bottom of the barrel body) is connected to the power output end of the driver, and the driver can be, for example, a motor. Preferably, the speed of the lower stirring device is set slightly faster than that of the upper stirring device, for example, the speed of the lower stirring device is 45-50r / min, and the speed of the upper stirring device is 40±2r / min, preferably about 40r / min, which can enhance the bottom stirring intensity, enable the bottom blending liquid to smoothly bring out the sand, and reduce the sedimentation of sand and scarring at the bottom.

[0014] Furthermore, the sealing cover includes a first cylindrical portion with a second through hole passing through the boss, a first flange ring radially extending from the outer periphery of the first cylindrical portion, and an axial protrusion arranged on the top of the first cylindrical portion (the first flange ring, the first cylindrical portion, and the axial protrusion can be formed as one piece), the bottom end of the first cylindrical portion is open, the top end is closed, the first flange ring is coaxial with the first cylindrical portion, the first cylindrical portion above the first flange ring is located in the lower groove body of the convex groove of the lower stirring impeller and is surrounded by a permanent magnet, a gap is reserved between the permanent magnet and the first cylindrical portion, and the first cylindrical portion below the first flange ring extends into the second through hole. The first flange ring is fixed on the boss, for example, it can be fixed to the boss by bolts. For example, an annular groove surrounding the second through hole is formed on the upper surface of the boss, and the shape of the annular groove corresponds to that of the first flange ring. The annular groove is located in the barrel body, and an annular sealing gasket sunk into the annular groove of the boss is laid between the annular groove and the first flange ring to achieve sealing at the second through hole of the boss. A third threaded hole is opened in the annular groove, and a fourth threaded hole corresponding to the position of the third threaded hole is opened on the first flange ring (the annular sealing gasket also has a through hole at the corresponding position for the bolt to pass through), and the bolt is inserted into the fourth threaded hole and the corresponding third threaded hole and tightened.

[0015] Preferably, the size and shape of the sealing gasket are consistent with the annular groove, the sealing gasket is sleeved on the first cylindrical portion below the first flange ring and sunk into the annular groove, and a fifth threaded hole corresponding to the fourth threaded hole is opened on the sealing gasket.

[0016] Furthermore, the cross-section of the isolation cover is in an inverted "X" shape, and the isolation cover includes a second cylindrical portion abutting the first cylindrical portion of the sealing cover and a second flange ring arranged on the outer periphery of the second cylindrical portion, the top end of the second cylindrical portion is open, and the top opening of the second cylindrical portion is matched with the bottom opening of the first cylindrical portion, and the bottom end of the second cylindrical portion is provided with a third through hole for the external magnetic transmission shaft to pass through, and a second bearing is fixed on the inner edge of the third through hole, the outer ring of the second bearing is fixedly connected to the second cylindrical portion, and the inner ring of the second bearing is fixedly connected to the external magnetic transmission shaft, and the second flange ring is formed by the second cylindrical portion extending radially outward at the opening position, a sixth threaded hole is provided on the second flange ring, and a seventh threaded hole is provided on the outer side of the barrel body at a position opposite to the sixth threaded hole.

[0017] Furthermore, a gap is provided between the external magnet and the inner wall of the sealing cover, and the external magnet rotates in the sealing cover and can be surrounded by the permanent magnet.

[0018] Furthermore, a steam outlet is provided on the top of the barrel body, and the steam outlet is a short tube extending to the inside of the barrel body. The bottom end of the steam outlet is connected to the air filter cover, and the air filter cover includes a fixing ring connected to the pipe wall of the steam outlet, a shell arranged below the fixing ring, a drain pipe connected to the bottom of the shell and connected to the internal space of the shell, and a plurality of suspension rods for connecting the shell and the fixing ring. The inner ring surface of the fixing ring is connected to the outer surface of the steam outlet, and a circular opening is formed at the top of the shell. The diameter of the circular opening is larger than the outer diameter of the steam outlet. The shell is in a shape that is larger in the middle and smaller at both ends. The bottom port of the steam outlet extends to the middle of the shell. The length of the drain pipe enables the bottom end liquid outlet of the drain pipe to extend below the liquid level in the barrel body. The suspension rod is connected between the top surface of the shell and the bottom surface of the fixing ring. There are at least two suspension rods, and square holes are formed between adjacent suspension rods.

[0019] Furthermore, the mother liquid inlet is a tubular body, the mother liquid inlet is arranged at the top of the barrel body, the port of the mother liquid inlet located inside the barrel body is provided with a mesh grille, and the mother liquid inlet is arranged above the ash milk inlet, and the sand liquid outlet is arranged at the bottom of the barrel body.

[0020] Furthermore, the barrel body is also provided with a fixed seat, a cleaning liquid inlet, a manhole, and a sand outlet. The fixed seat is fixed to the outer wall of the barrel body, the sand outlet is arranged below the sand liquid outlet, the cleaning liquid inlet is arranged at the upper part of the barrel body, and the manhole is arranged at the lower part of the barrel body.

[0021] Beneficial effects of the present invention: The present invention provides a pre-ash bucket for preventing sand accumulation, which abandons the traditional single-axis stirring mode. Through the cooperation between the upper stirring device and the lower stirring device, the upper stirring device and the lower stirring device work independently without affecting each other, thereby achieving effective mixing of the mother liquor and the ash milk and improving the stirring effect. At the same time, the lower stirring device stirs the medium at the bottom of the barrel body, slowing down the sedimentation speed of the sand particles at the bottom of the barrel body, and greatly prolonging the working cycle of the pre-ash bucket; the blades arranged on the upper stirring impeller are independent of each other and detachably connected to the wheel shaft. When installing and disassembling, the blades are inserted into or pulled out of the T-groove, and the wheel shaft cover is disassembled, thereby avoiding the cumbersome disassembly process during replacement, and scarred and worn blades can be repaired and repaired promptly. Replace it from time to time to improve the mixing efficiency; the driver drives the sleeve coupling and the external magnetic transmission shaft to rotate, the external magnet rotates synchronously with the external magnetic transmission shaft, there is an induced magnetic field between the external magnet and the permanent magnet, and the external magnet drives the permanent magnet to rotate synchronously, thereby driving the lower stirring impeller to rotate to stir the ash milk and preheated mother liquor, realizing the non-contact transmission between the driver and the lower stirring impeller, which not only ensures the sealing of the barrel bottom, effectively prevents the damage to the device when the lower stirring impeller is stuck, and slows down the deposition speed of sand at the bottom of the barrel, but also has a short transmission distance, and speeding up the speed will not cause large vibrations in the pre-ash barrel; by setting up a filter cover to remove small droplets of blending liquid carried by steam, it prevents subsequent pipeline blockage. Further setting the speed of the lower stirring device slightly faster than that of the upper stirring device can enhance the bottom stirring intensity, so that the bottom blending liquid can smoothly bring out the sand, and reduce the bottom sand deposition and scarring. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the anti-sand accumulation pre-ash bucket of the present invention.

[0023] Figure 2 It is a schematic diagram of the structure of the barrel.

[0024] Figure 3 It is a schematic diagram of the structure of the top of the barrel.

[0025] Figure 4 It is a schematic diagram of the structure of the bottom of the barrel.

[0026] Figure 5 It is a schematic cross-sectional view of the bottom of the barrel.

[0027] Figure 6 Schematic diagram of the air filter cover.

[0028] Figure 7 A cross-sectional view of the air filter cover.

[0029] Figure 8 Schematic diagram of the stirring device.

[0030] Fig. 9 Schematic diagram of the structure of the upper stirring impeller.

[0031] Fig.10 This is a schematic diagram of the assembly of the upper stirring impeller.

[0032] Fig.11 Schematic diagram of the lower stirring device.

[0033] Fig.12 It is a cross-sectional view of the lower stirring device.

[0034] Fig.13 Schematic diagram of the structure of the lower stirring impeller.

[0035] Fig.14 It is a sectional perspective view of the sealing cover.

[0036] Fig.15 This is a schematic diagram of the installation of the isolation cover.

[0037] Fig.16 This is an exploded view of the lower stirring device.

[0038] Reference numerals: 10-barrel body, 101-mother liquor inlet, 102-steam outlet, 103-ash milk inlet, 104-cleaning liquid inlet, 105-manhole, 106-sand outlet, 107-sand liquid outlet, 108-fixed seat, 109-second through hole, 110-annular groove, 20-air filter cover, 201-fixing ring, 202-square hole, 203-shell, 204-drain pipe, 30-upper stirring device, 301-reduction motor, 302-transmission shaft, 303-support frame, 40-lower stirring device, 401-lower stirring impeller, 402-permanent magnet, 403-sealing cover, 4031-first cylindrical portion, 4032-first flange ring, 4033-axial protrusion, 404-male bearing, 405-external magnet, 406-external magnetic transmission shaft, 407-sleeve coupling, 408-isolating cover, 4081-second cylindrical portion, 4082-second flange ring, 409-flat washer, 410-sealing pad, 411-second bearing, 50-upper stirring impeller, 501-paddle, 502-axle, 503-axle cover, 5031-arc cover, 5032-limiting plate, 5033-second threaded hole, 504-sector-shaped groove, 505-T-shaped groove, 506-first threaded hole. DETAILED DESCRIPTION

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0040] like Figure 1-16As shown, a pre-ash barrel for preventing sand accumulation includes a barrel body 10, an upper stirring device 30 and a lower stirring device 40 which are arranged in the barrel body 10 and are used to mix mother liquor and ash emulsion, the upper stirring device 30 includes a transmission shaft 302 extending to the inside of the barrel body 10, and a plurality of upper stirring impellers 50 detachably connected to the transmission shaft 302, the lower stirring device 40 is arranged at the bottom of the barrel body 10, the lower stirring device 40 includes a lower stirring impeller 401 rotatably connected to the bottom wall of the barrel body 10, the rotation direction of the lower stirring impeller 401 is such that the medium turns upward during rotation to reduce sand deposition, the barrel body 10 is provided with a mother liquor inlet 101 for mother liquor to enter, an ash emulsion inlet 103 for ash emulsion to enter, and a sand liquid outlet 107 for outputting a blended liquid formed by mixing the mother liquor and the ash emulsion.

[0041] like Figure 1 , Figure 2 As shown, the barrel body 10 is a closed cylindrical structure, which is generally 8-10m in height and 4-5m in diameter.

[0042] like Figure 8 As shown, the upper stirring device 30 includes a reduction motor 301 (including a motor and a reducer matched therewith) for driving the transmission shaft 302 to rotate and a support frame 303 for supporting and fixing the transmission shaft 302. The reduction motor 301 is fixed to the top of the barrel body 10, and the power output end of the reduction motor 301 is connected to the transmission shaft 302. A first through hole for the transmission shaft 302 to extend out is opened on the top of the barrel body 10. The top end of the transmission shaft 302 extends out of the first through hole and is connected to the reduction motor 301. The support frame 303 is connected to the bottom end of the transmission shaft 302. The support frame 303 includes a first bearing connected to the bottom end of the transmission shaft 302, an outer ring fixedly connected to the inner wall of the cylinder, and a plurality of support rods connected between the first bearing and the outer ring and distributed in a divergent manner. For example, there may be three support rods, and the central angle between adjacent support rods is 120°. The support rods may be angle steels, for example. The support frame 303 is arranged above the sand liquid outlet 107. Furthermore, the support rods are fixedly connected to the outer ring of the first bearing, and the transmission shaft 302 is fixedly connected to the inner ring of the first bearing. When the transmission shaft 302 rotates, the outer ring is fixed.

[0043] like Figure 1 , Figure 8As shown, the ratio of the diameter of the upper stirring impeller 50 to the diameter of the barrel body 10 can be 1:1-5, preferably 1:2-4, and further about 1:3. There are at least two stirring impellers, for example three or four. Multiple upper stirring impellers 50 can be arranged at basically equal intervals along the axial direction of the transmission shaft 302. The number of stirring impellers is adjusted according to the length of the transmission shaft 302. Preferably, three or four upper stirring impellers 50 are evenly arranged. The rotation direction of the topmost upper stirring impeller 50 is different from that of the remaining upper stirring impellers 50. Preferably, the rotation direction of the topmost upper stirring impeller 50 causes the medium to flip downward, and the rotation direction of the remaining upper stirring impellers 50 causes the medium to flip upward, so that the ash milk and the mother liquor can contact better and react more fully.

[0044] like Fig. 9 , Fig.10As shown, each upper stirring impeller 50 includes a wheel shaft 502 fixedly connected to the transmission shaft 302, a plurality of blades 501 evenly distributed along the circumference of the wheel shaft 502, and a wheel shaft cover 503 for fixing the blades 501 to the wheel shaft 502. The wheel shaft 502 is a straight cylinder. The transmission shaft 302 passes through the wheel shaft 502 and is fixedly connected to the inner wall of the wheel shaft 502. The top of the wheel shaft 502 is provided with a plurality of fan-shaped grooves 504, and the plurality of fan-shaped grooves 504 are evenly distributed along the circumferential direction. The wheel shaft 502 is provided with a plurality of T-shaped grooves 505. The T-grooves 505 and the fan-shaped grooves 504 are alternately arranged in sequence, the T-grooves 505 are blind grooves, each T-groove 505 is connected to a blade 501, the depth direction of the T-groove 505 is the same as the axial direction of the transmission shaft 302, the T-groove includes a flange groove portion and a belly groove portion that are connected to each other, the flange groove portion forms openings on the top surface and the side surface of the wheel shaft 502, the belly groove portion forms an opening on the top surface of the wheel shaft 502, and a plurality of first threaded holes 506 are opened on the wheel shaft 502 between adjacent fan-shaped grooves 504. Preferably, first threaded holes 506 are set on both sides of the T-groove 505, and the wheel shaft cover 503 includes an arc-shaped cover 5031 covering the top surface of the wheel shaft and a limiting plate 5032 fixed on both sides of the arc-shaped cover 5031 and protruding downward, the two limiting plates 5032 are respectively inserted into two adjacent fan-shaped grooves 504 for matching and fixing, and the arc-shaped cover 5031 is opened with The position of the first threaded hole 506 corresponds to the second threaded hole 5033, the torsion angle of the paddle 501 is 45°, the paddle 501 includes a T-block inserted into the T-groove 505 and a blade connected to the T-block, the T-block and the T-groove 505 are transitionally matched, the T-block is inserted into the T-groove 505 to position the paddle 501, and then the two limit plates 5032 are respectively inserted into two adjacent fan-shaped grooves 504, the arc cover 5031 covers the top surface of the axle 502, the first threaded hole 506 and the second threaded hole 5033 are coaxial, the bolts are screwed into the first threaded hole 506 and the second threaded hole 5033, the paddle 501 is fixed to the axle 502, when it needs to be disassembled, the bolts are tightened, the axle cover 503 is removed, and the paddle 501 is taken out. Each paddle 501 is disassembled independently without affecting each other, and the scarred and worn paddles 501 are replaced in time to improve the mixing efficiency.

[0045] like Figure 1 , Figure 2 , Figure 4 , Figure 5 As shown, a boss facing the inside of the barrel body 10 is formed at the bottom of the barrel body 10, and a second through hole 109 is opened at the center of the boss for the transmission shaft driving the lower stirring impeller 401 to pass through. The specification of the second through hole 109 is, for example, Φ80, and the outer diameter of the annular groove 110 can be, for example, Φ150.

[0046] like Fig.11 , Fig.12 , Fig.13As shown, a convex groove is opened on the inner side of the lower stirring impeller 401, and the opening of the convex groove faces downward. The convex groove includes an upper groove body and a lower groove body. The upper groove body and the lower groove body are, for example, circular grooves. The inner diameter of the upper groove body is smaller than the inner diameter of the lower groove body. A permanent magnet 402 is fixed on the groove wall of the lower groove body of the convex groove. The lower stirring impeller 401 can be, for example, three blades, four blades or ten blades. Preferably, the rotation direction of the lower stirring impeller 401 is the same as the rotation direction of the upper stirring impeller 50 at the lower end of the upper stirring device 30. When rotating, the lower stirring impeller 401 makes the medium upward, thereby reducing the deposition of sand and allowing the sand to be discharged together with the blending liquid.

[0047] like Figure 1 , Fig.11 , Fig.12 , Fig.13 , Fig.14 , Fig.15 , Fig.16 As shown, the lower stirring device 40 also includes a sealing cover 403 fixed on the bottom boss of the barrel body and connected to the lower stirring impeller 401 through a male bearing 404 installed in the upper groove body of the convex groove of the lower stirring impeller 401, an external magnetic transmission shaft 406 extending from below the bottom surface of the barrel body into the sealing cover 403, an external magnet 405 fixed to the top of the external magnetic transmission shaft 406 (the external magnet 405 surrounds and covers the outer periphery of the top of the external magnetic transmission shaft 406), a sleeve coupling 407 connected to the end of the external magnetic transmission shaft 406 away from the bottom of the barrel body, and a separation cover 408 for fixing the external magnetic transmission shaft 406 to the barrel body (the bottom of the barrel body and outside the barrel body cavity), and the end of the sleeve coupling 407 not connected to the external magnetic transmission shaft 406 (i.e., the end close to the bottom of the barrel body) is connected to the power output end of the driver, and the driver can be, for example, a motor. The speed ratio of the lower stirring device 40 and the upper stirring device 30 can be, for example, 1-2:1, preferably about 1.3:1.

[0048] like Fig.14As shown, the sealing cover 403 includes a first cylindrical portion 4031 that penetrates the second through hole 109 of the boss, a first flange ring 4032 that extends outward from the outer periphery of the first cylindrical portion 4031 (the outer periphery of the middle part of the first cylindrical portion 4031), and an axial protrusion 4033 arranged on the top of the first cylindrical portion 4031. The bottom end of the first cylindrical portion 4031 is open and the top end is closed. The first flange ring 4032 is coaxial with the first cylindrical portion 4031. The first cylindrical portion 4031 above the first flange ring 4032 is located in the lower groove body of the convex groove of the lower stirring impeller 401 and is surrounded by the permanent magnet 402. A gap is reserved between the permanent magnet 402 and the first cylindrical portion 4031. The first cylindrical portion 4031 below the first flange ring 4032 extends into the second In the through hole 109, the first flange ring 4032 is fixed on the boss, for example, it can be fixed on the boss by bolts. For example, an annular groove 110 surrounding the second through hole 109 is formed on the upper surface of the boss, and the shape of the annular groove corresponds to the first flange ring. The annular groove 110 is located in the barrel body 10, and an annular sealing gasket 410 sunk into the annular groove 110 of the boss is laid between the annular groove and the first flange ring to achieve sealing at the second through hole of the boss. A third threaded hole is opened in the annular groove 110, and a fourth threaded hole corresponding to the position of the third threaded hole is opened on the first flange ring 4032 (the annular sealing gasket also has a through hole at the corresponding position for the bolt to pass through), and the bolt is inserted into the fourth threaded hole and the corresponding third threaded hole and tightened.

[0049] The size and shape of the sealing gasket 410 are consistent with the annular groove 110. The sealing gasket 410 is sleeved on the first cylindrical portion 4031 below the first flange ring 4032 and sunk into the annular groove 110. The sealing gasket 410 is provided with a fifth threaded hole corresponding to the fourth threaded hole. The material of the sealing gasket 410 may be rubber, for example. In specific application, the sealing gasket 410 is sleeved on the first cylindrical portion 4031 below the first flange ring 4032, the sealing cover 403 is placed in the second through hole 109, the bolts are passed through the fourth threaded hole, the fifth threaded hole and the third threaded hole and tightened, and the first flange ring 4032 squeezes the sealing gasket 410 to strengthen the sealing performance of the connection between the sealing cover 403 and the boss.

[0050] The inner ring of the male bearing 404 is connected to the axial protrusion 4033 (the axial protrusion 4033 is installed on the inner ring of the male bearing 404, and the male bearing 404 can rotate around the axial protrusion 4033), and the outer ring of the male bearing 404 is fixedly connected to the upper groove body of the convex groove. A flat washer 409 is provided between the male bearing 404 and the top surface of the first cylindrical portion 4031 to play a protective role. The male bearing 404 itself can rotate. The male bearing 404 adopts conventional technology well known to technicians in this field and will not be described in detail here.

[0051] The cross section of the isolation cover 408 is in the shape of an inverted "X". The isolation cover 408 includes a second cylindrical portion 4081 that abuts against the first cylindrical portion 4031 of the sealing cover and a second flange ring 4082 arranged on the outer periphery of the second cylindrical portion 4081. The top end of the second cylindrical portion 4081 is open, and the top opening of the second cylindrical portion 4081 is matched with the bottom opening of the first cylindrical portion 4031. The bottom end of the second cylindrical portion 4081 is provided with a third through hole for the external magnetic transmission shaft 406 to pass through. The inner edge of the third through hole is fixed with a second bearing 411. The outer ring of the second bearing 411 is connected to the second cylindrical portion 4081. 1 is fixedly connected, the inner ring of the second bearing 411 is fixedly connected to the external magnetic transmission shaft 406 (that is, the external magnetic transmission shaft 406 is fixed to the isolation cover 408 through the second bearing 411, and the external magnetic transmission shaft 406 is rotatable in the inner ring of the bearing 411), the second flange ring 4082 is formed by the second cylindrical portion 4081 extending radially outward at the opening position, the second flange ring 4082 is provided with a sixth threaded hole, the outer side of the barrel body 10 is provided with a seventh threaded hole opposite to the sixth threaded hole, and the isolation cover 408 is fixed to the barrel body 10 by screwing bolts into the sixth threaded hole and the seventh threaded hole.

[0052] A gap is provided between the external magnet 405 and the inner wall of the sealing cover 403. The external magnet 405 can rotate in the sealing cover 403 and is surrounded by the permanent magnet 402. In specific applications, the driver drives the sleeve coupling 407 and the external magnetic transmission shaft 406 to rotate, and the external magnet 405 rotates synchronously with the external magnetic transmission shaft 406. There is an induced magnetic field between the external magnet 405 and the permanent magnet 402, generating kinetic energy. The external magnet 405 drives the permanent magnet 402 to rotate synchronously, thereby driving the lower stirring impeller 401 to rotate to stir the ash milk and the preheated mother liquor, thereby realizing non-contact transmission between the driver and the lower stirring impeller 401, which not only ensures the sealing of the bottom of the barrel, but also can effectively prevent damage to the device when the lower stirring impeller 401 is stuck, and slows down the deposition rate of sand at the bottom of the barrel body 10.

[0053] like Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7As shown, a steam outlet 102 is provided at the top of the barrel body 10, and the steam outlet 102 is a short tube extending to the inside of the barrel body 10, and the bottom end of the steam outlet 102 is connected to the air filter cover 20, and the air filter cover 20 includes a fixing ring 201 connected to the pipe wall of the steam outlet 102, a shell 203 arranged below the fixing ring 201, a drain pipe 204 connected to the bottom of the shell 203 and communicating with the internal space of the shell 203, and a plurality of suspension rods for connecting the shell 203 and the fixing ring 201, the inner ring surface of the fixing ring 201 is connected to the outer surface of the steam outlet 102, for example, by welding, and a circular opening is formed at the top of the shell 203, the diameter of the circular opening is larger than the outer diameter of the steam outlet 102, and the shell 203 is in a shape of being large in the middle and small at both ends (with reduced diameter sections at the upper and lower ends). The bottom port of the steam outlet 102 extends to the middle of the shell 203. The length of the drain pipe 204 allows the bottom outlet of the drain pipe 204 to extend below the liquid level in the barrel 10. The suspension rod is connected between the top surface of the shell 203 and the bottom surface of the fixing ring 201. There are at least two suspension rods, and multiple suspension rods are preferably evenly distributed. Square holes 202 are formed between adjacent suspension rods. Steam enters the shell 203 from the square hole 202 and moves downward. After entering the shell 203, the steam changes its direction of movement to avoid steam directly passing through the steam outlet 102. The gas velocity is too fast, which makes it easy to carry tiny droplets and produce liquid carrying phenomenon, which is equivalent to removing small droplets of blending liquid carried by steam in a baffled manner to prevent subsequent pipeline blockage. The small droplets return to the blending liquid through the drain pipe 204.

[0054] like Figure 2 , Figure 3 As shown, the mother liquor inlet 101 is a tubular body, and the mother liquor inlet 101 is arranged at the top of the barrel body 10. The port of the mother liquor inlet 101 located in the barrel body 10 is provided with a mesh grid for filtering components that are not completely separated during the distillation process, such as trace reaction by-products, insoluble solids, sediments or other impurities, and the mother liquor inlet 101 is arranged above the ash milk inlet 103 to facilitate the full mixing of the ash milk and the mother liquor.

[0055] like Figure 2 As shown, the sand and liquid outlet 107 is disposed at the bottom of the barrel body 10 .

[0056] like Figure 2 , Figure 3As shown, the barrel body 10 is also provided with a fixing seat 108, a cleaning liquid inlet 104, a manhole 105, and a sand outlet 106. The fixing seat 108 is fixed to the outer wall of the barrel body 10. Preferably, the fixing seat 108 is arranged in the middle of the barrel body 10. The fixing seat 108 is used to fix the barrel body 10. The sand outlet 106 is arranged below the sand liquid outlet 107 and at the bottom of the barrel body 10. The sand outlet 106 is used to release the silt in the barrel when stopping work for cleaning. The sand outlet 106 is a slow-opening cock valve to avoid operating errors when workers use it. The cleaning liquid inlet 104 is arranged on the upper part of the barrel body 10. The cleaning liquid inlet 104 is used to input cleaning liquid to clean the inside of the barrel body 10, and the clean liquid and waste liquid are discharged from the sand liquid outlet 107. The sand liquid outlet 107 is located at the lower side of the barrel body. The manhole 105 is arranged in the middle and lower part of the barrel body 10. The manhole 105 is used for personnel to enter and exit the barrel body 10 for inspection and maintenance. The ash milk and the preheated mother liquor enter the pre-ash barrel from the ash milk inlet 103 and the mother liquor inlet 101 respectively, and are stirred and mixed by the upper stirring device 30 and the lower stirring device 40 to form a blending liquid and discharged from the sand liquid outlet 107, and then enter the distillation tower to evaporate ammonia.

[0057] During operation, the ash milk and the preheated mother liquor enter the barrel body 10 from the ash milk inlet 103 and the mother liquor inlet 101 respectively, and after being stirred by the upper stirring device 30 and the lower stirring device 40, the blended liquid is formed and then enters the distillation tower from the sand liquid outlet 107 to evaporate ammonia. The blades 501 of the upper stirring device 30 are independent parts, which are convenient for replacement when they are worn or severely scarred; the speed of the lower stirring device 40 is slightly faster than that of the upper stirring device 30, for example, the speed of the lower stirring device 40 is 45-50r / min, and the speed of the upper stirring device 30 is 40±2r / min, preferably about 40r / min, which can enhance the stirring strength at the bottom, so that the blended liquid at the bottom can smoothly bring out the sand, and reduce the sedimentation and scarring of the sand at the bottom. At the same time, the lower stirring device 40 adopts non-contact transmission, which not only has good sealing and prevents jamming, but also has a short transmission distance, and the speed increase will not cause the pre-ash barrel to vibrate greatly.

[0058] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A pre-ash bucket for preventing sand accumulation, characterized in that: The invention comprises a barrel (10), an upper stirring device (30) and a lower stirring device (40) arranged in the barrel (10) and used for mixing mother liquor and ash milk, wherein the upper stirring device (30) comprises a transmission shaft (302) extending into the barrel (10) and a plurality of upper stirring impellers (50) detachably connected to the transmission shaft (302), and the lower stirring device (40) is arranged at the bottom of the barrel (10), and the lower stirring device (40) comprises a lower stirring impeller (401) rotatably connected to the bottom wall of the barrel (10), wherein the rotation direction of the lower stirring impeller (401) is such that the medium turns upward during rotation to reduce the deposition of sand particles, and the barrel (10) is provided with a mother liquor inlet (101) for mother liquor to enter, an ash milk inlet (103) for ash milk to enter, and a sand liquid outlet (107) for outputting a blended liquid formed by mixing the mother liquor and the ash milk.

2. The anti-sand accumulation pre-ash bucket according to claim 1, characterized in that: The upper stirring device (30) further comprises a reduction motor (301) for driving the transmission shaft (302) to rotate and a support frame (303) for supporting and fixing the transmission shaft (302). The reduction motor (301) is fixed to the top of the barrel body (10). The power output end of the reduction motor (301) is connected to the transmission shaft (302). The top of the barrel body (10) is provided with a first through hole for the transmission shaft (302) to extend out. The top end of the transmission shaft (302) extends out of the first through hole and is connected to the reduction motor (301). The support frame (303) is connected to the bottom end of the transmission shaft (302). The support frame (303) comprises a first bearing connected to the bottom end of the transmission shaft (302), an outer ring fixedly connected to the inner wall of the barrel body, and a plurality of support rods connected between the first bearing and the outer ring and distributed in a divergent shape. The support frame (303) is arranged above the sand liquid outlet (107).

3. The anti-sand accumulation pre-ash bucket according to claim 1, characterized in that: The rotation direction of the top upper stirring impeller (50) is different from the rotation directions of the other upper stirring impellers (50). The rotation direction of the top upper stirring impeller (50) causes the medium to turn downward, while the rotation directions of the other upper stirring impellers (50) cause the medium to turn upward.

4. The anti-sand accumulation pre-ash bucket according to claim 3, characterized in that: Each upper stirring impeller (50) comprises a wheel shaft (502) fixedly connected to the transmission shaft (302), a plurality of paddle blades (501) evenly distributed along the circumference of the wheel shaft (502), and a wheel shaft cover (503) for fixing the paddle blades (501) to the wheel shaft (502); the wheel shaft (502) is a straight cylinder; the transmission shaft (302) passes through the wheel shaft (502) and is fixedly connected to the inner wall of the wheel shaft (502); a plurality of fan-shaped grooves (504) are formed on the top of the wheel shaft (502); the plurality of fan-shaped grooves (504) are evenly distributed along the circumference; a plurality of T-shaped grooves (505) are formed on the wheel shaft (502); The T-shaped grooves (505) and the fan-shaped grooves (504) are alternately arranged at intervals. The T-shaped grooves (505) are blind grooves. Each T-shaped groove (505) is connected to a blade (501). The depth direction of the T-shaped groove (505) is the same as the axial direction of the transmission shaft (302). The T-shaped groove includes a flange groove portion and a belly groove portion that are connected to each other. The flange groove portion forms an opening on the top surface and the side surface of the wheel shaft (502). The belly groove portion forms an opening on the top surface of the wheel shaft (502). A plurality of first threaded holes (506) are opened on the wheel shaft (502) between adjacent fan-shaped grooves (504). The first threaded holes (506) are arranged on both sides of the T-shaped groove (505). The shaft cover (503) comprises an arc-shaped cover (5031) covering the top surface of the wheel shaft (502) and stop plates (5032) fixed on both sides of the arc-shaped cover (5031) and protruding downwards, the two stop plates (5032) are respectively inserted into two adjacent fan-shaped grooves (504) for matching and fixing, the arc-shaped cover (5031) is provided with a second threaded hole (5033) corresponding to the position of the first threaded hole (506), the blade (501) comprises a T-shaped block inserted into the T-shaped groove (505) and a blade connected to the T-shaped block, the T-shaped block is transitionally matched with the T-shaped groove (505), and the T-shaped block is inserted into the T-shaped groove (505) to position the blade (501).

5. The anti-sand pre-ash bucket according to any one of claims 1 to 3, characterized in that: A boss facing the inside of the barrel body (10) is formed at the bottom of the barrel body (10), and a second through hole (109) for a transmission shaft driving the lower stirring impeller (401) to pass through is opened at the center of the boss.

6. The anti-sand accumulation pre-ash bucket according to claim 5, characterized in that: A convex groove is formed on the inner side of the lower stirring impeller (401), the opening of the convex groove faces downward, the convex groove comprises an upper groove body and a lower groove body, both of which are circular grooves, the inner diameter of the upper groove body is smaller than the inner diameter of the lower groove body, a permanent magnet (402) is fixed on the groove wall of the lower groove body, and the rotation direction of the lower stirring impeller (401) is the same as the rotation direction of the upper stirring impeller (50) at the lower end of the upper stirring device (30).

7. The anti-sand accumulation pre-ash bucket according to claim 6, characterized in that: The lower stirring device (40) further comprises a sealing cover (403) fixed on the bottom boss of the barrel body (10) and connected to the lower stirring impeller, an external magnetic transmission shaft (406) extending from below the bottom surface of the barrel body into the sealing cover (403), an external magnet (405) fixed to the top of the external magnetic transmission shaft (406), a sleeve coupling (407) connected to an end of the external magnetic transmission shaft (406) away from the bottom of the barrel body, and an isolation cover (408) for fixing the external magnetic transmission shaft (406) to the bottom of the barrel body, and an end of the sleeve coupling (407) not connected to the external magnetic transmission shaft (406) is connected to the power output end of the driver; and / or The sealing cover (403) comprises a first cylindrical portion (4031) penetrating the second through hole (109) of the boss, a first flange ring (4032) radially extending from the outer periphery of the first cylindrical portion (4031), and an axial protrusion (4033) arranged on the top of the first cylindrical portion (4031). The bottom end of the first cylindrical portion (4031) is open and the top end is closed. The first flange ring (4032) is coaxial with the first cylindrical portion (4031). The first flange ring (4032) is coaxial with the first cylindrical portion (4031). The first cylindrical portion (4031) above the first flange ring (4032) is located in the lower groove body of the convex groove of the lower stirring impeller (401) and is surrounded by the permanent magnet (402). A gap is reserved between the permanent magnet (402) and the first cylindrical portion (4031). The first cylindrical portion (4031) below the first flange ring (4032) extends into the second through hole (109). The first flange ring (4032) is provided with a fourth threaded hole corresponding to the position of the third threaded hole. The first flange ring 4 032 is fixed to the boss, preferably, fixed to the boss by bolts, an annular groove (110) surrounding the second through hole (109) is formed on the upper surface of the boss, the shape of the annular groove corresponds to the first flange ring, the annular groove (110) is located in the barrel body (10), an annular sealing gasket (410) is laid between the annular groove and the first flange ring and sunk into the annular groove (110) of the boss, and is used to achieve sealing at the second through hole of the boss, a third threaded hole is opened in the annular groove (110), and a fourth threaded hole corresponding to the position of the third threaded hole is opened on the first flange ring (4032); and / or the size and shape of the sealing gasket (410) are consistent with the annular groove (110), the sealing gasket (410) is annularly sleeved on the first cylindrical portion (4031) below the first flange ring (4032) and sunk into the annular groove (110), and the sealing gasket (410) is opened with a fifth threaded hole corresponding to the fourth threaded hole; and / or The isolation cover (408) has a cross-section in the shape of an inverted "X". The isolation cover (408) includes a second cylindrical portion (4081) abutting against the first cylindrical portion (4031) of the sealing cover and a second flange ring (4082) arranged on the outer periphery of the second cylindrical portion (4081). The top end of the second cylindrical portion (4081) is open, and the top opening of the second cylindrical portion (4081) is matched with the bottom opening of the first cylindrical portion (4031). The bottom end of the second cylindrical portion (4081) is provided with a third passage for the external magnetic transmission shaft (406) to pass through. A second bearing (411) is fixed to the inner edge of the third through hole, the outer ring of the second bearing (411) is fixedly connected to the second cylindrical portion (4081), the inner ring of the second bearing (411) is fixedly connected to the external magnetic transmission shaft (406), the second flange ring (4082) is formed by the second cylindrical portion (4081) extending radially outward at the opening position, the second flange ring (4082) is provided with a sixth threaded hole, and the outer side of the barrel body (10) is provided with a seventh threaded hole located opposite to the sixth threaded hole; and / or A gap is provided between the external magnet (405) and the inner wall of the sealing cover (403); the external magnet (405) rotates in the sealing cover (403) and can be surrounded by the permanent magnet (402).

8. The anti-sand pre-ash bucket according to any one of claims 1 to 3, characterized in that: A steam outlet (102) is provided at the top of the barrel body (10), the steam outlet (102) is a short tube extending into the interior of the barrel body (10), the bottom end of the steam outlet (102) is connected to the air filter cover (20), the air filter cover (20) comprises a fixing ring (201) connected to the tube wall of the steam outlet (102), a shell (203) arranged below the fixing ring (201), a liquid discharge pipe (204) connected to the shell (203) below and communicating with the internal space of the shell (203), a plurality of suspension rods for connecting the shell (203) and the fixing ring (201), and an inner ring of the fixing ring (201). The shell (203) is connected to the outer surface of the steam outlet (102), the top of the shell (203) forms a circular opening, the diameter of the circular opening is larger than the outer diameter of the steam outlet (102), the shell (203) is in a shape of being larger in the middle and smaller at both ends, the bottom port of the steam outlet (102) extends to the middle of the shell (203), the length of the drain pipe (204) allows the bottom liquid outlet of the drain pipe (204) to extend below the liquid level in the barrel (10), the suspension rod is connected between the top surface of the shell (203) and the bottom surface of the fixing ring (201), there are at least two suspension rods, and a square hole (202) is formed between adjacent suspension rods.

9. The anti-sand accumulation pre-ash bucket according to any one of claims 1 to 3, characterized in that: The mother liquor inlet (101) is a tubular body, and the mother liquor inlet (101) is arranged at the top of the barrel body (10). The port of the mother liquor inlet (101) located inside the barrel body (10) is provided with a mesh grille, and the mother liquor inlet (101) is arranged above the ash milk inlet (103), and the sand liquid outlet (107) is arranged at the bottom of the barrel body (10).

10. The anti-sand accumulation pre-ash bucket according to claim 9, characterized in that: The barrel body (10) is also provided with a fixing seat (108), a cleaning liquid inlet (104), a manhole (105), and a sand outlet (106); the fixing seat (108) is fixed to the outer wall of the barrel body (10); the sand outlet (106) is arranged below the sand liquid outlet (107); the cleaning liquid inlet (104) is arranged at the upper part of the barrel body (10); and the manhole (105) is arranged at the lower part of the barrel body (10).

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