Anti-blocking structure of washing fly ash rotary drying kiln

Abstract

The invention relates to the technical field of anti-blocking of drying kilns, in particular to an anti-blocking structure of a washing fly ash rotary drying kiln, which comprises a rotary kiln body, two ends of the rotary kiln body are respectively sleeved with a front annular cover and a rear annular cover, and the outer side of the rotary kiln body is movably sleeved with two groups of annular plates; compared with the prior art, after the gear ring and the feeding pipe in the inner cavity of the gear ring are driven by the driving assembly to rotate, the feeding pipe drives the whole blocking mechanism to rotate, and the blocking mechanism is arranged in the inner cavity of the rotary kiln body. A scraping rod of the blocking mechanism scrapes scaling substances on the inner wall of the rotary kiln body, hot steam is guided in through a steam pipe of the blocking mechanism, so that the hot steam heats a hollow rod and the scraping rod, the hollow rod and the scraping rod are subjected to indirect heat exchange with to-be-dried wet ash in the rotating process, the materials are effectively heated while descaling is conducted, and the drying efficiency is improved. The heat transfer area is increased, and the drying efficiency of the rotary drying kiln is improved.

Description

Technical Field

[0001] This invention relates to the field of anti-clogging technology for drying kilns, and more particularly to an anti-clogging structure for a rotary drying kiln for water-washed fly ash. Background Technology

[0002] The common method for treating municipal solid waste is incineration. Incineration produces a large amount of fly ash, which contains heavy metals and soluble salts. Directly burying or releasing fly ash into the air will cause damage to the environment. Therefore, a series of treatments are needed to remove the heavy metals and soluble salts from the fly ash. This involves first washing the fly ash with water, and then drying the washed fly ash in a drying kiln.

[0003] Currently, the fly ash from municipal solid waste incineration, after being washed, is prone to scaling during the drying process due to residual calcium sulfate and calcium carbonate. When heated, the calcium carbonate crystals form calcium sulfate dihydrate, which agglomerates with the wet ash. Some of this scale adheres to the inner wall of the drying kiln, forming a "hard shell" that can be 5-15 mm thick. This not only reduces heat transfer efficiency but also requires frequent shutdowns for cleaning, severely impacting continuous operation. Some of this scale agglomerates into large lumps, resulting in uneven drying and affecting the subsequent treatment of the fly ash. To address this issue, we provide an anti-clogging structure for a rotary kiln for washed fly ash to solve this problem. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects in the prior art and provide an anti-clogging structure for a rotary drying kiln for water-washed fly ash.

[0005] To achieve the above objectives, the technical solution of the present invention is to design an anti-clogging structure for a rotary drying kiln for water-washed fly ash, comprising a rotary kiln body, with a front annular cover and a rear annular cover respectively fitted at both ends of the rotary kiln body, and two sets of annular plates movably fitted on the outer side of the rotary kiln body, the two sets of annular plates being connected to the front annular cover and the rear annular cover respectively, and an anti-clogging mechanism being provided in the inner cavity of the rotary kiln body, one end of the anti-clogging mechanism being connected to a feeding assembly; The feeding assembly includes a feeding pipe, a toothed ring is mounted on the outside of the feeding pipe, and a drive assembly is engaged on the outside of the toothed ring. The blocking mechanism includes a fixed plate, the middle of which is fixedly inserted into the feed pipe. Hollow rods are equidistantly connected to one side of the fixed plate. Scraper rods are integrally connected to the outer sides of each hollow rod. The right ends of multiple hollow rods are connected to a base. L-shaped channels corresponding to the positions of the hollow rods are equidistantly arranged inside the base. A circular hole communicating with the L-shaped channels is provided at the right end of the base.

[0006] In a further preferred embodiment, the outer end of the fixed disk is provided with through holes at equal intervals corresponding to the position of the hollow rod, and the left end of the fixed disk is connected with a second drain pipe at equal intervals corresponding to the position of the through holes. The second drain pipe is located in the inner cavity of the front annular cover, and the lower outer part of the front annular cover is connected with a first drain pipe.

[0007] In a further preferred embodiment, a steam pipe is installed in the inner cavity of the circular hole, the base is located in the inner cavity of the rear annular cover, the right end of the steam pipe passes through the rear annular cover and extends to its outer side where a solenoid valve is installed, and a discharge pipe is connected to the lower outer side of the rear annular cover.

[0008] In a further preferred embodiment, multiple sets of scraper strips are equidistantly connected to both sides of the scraper rod, and three sets of arc-shaped support plates are equidistantly connected between each adjacent hollow rod, with dispersion rods equidistantly connected to the inner side of the arc-shaped support plates.

[0009] In a further preferred embodiment, the inner wall of the rear annular cover is provided with an annular groove, and the right end of the base is integrally connected with a limiting ring that slides with it.

[0010] In a further preferred embodiment, multiple sets of reinforcing plates are welded together between the feed pipe and the fixed plate, and a bearing seat is installed in the middle of the front annular cover, with the feed pipe rotatably connected to the bearing seat.

[0011] In a further preferred embodiment, the drive assembly includes a drive motor, the output end of which is connected to a rotating shaft, and a gear that meshes with a gear ring is mounted on the outer side of the rotating shaft.

[0012] In a further preferred embodiment, the feeding assembly further includes a feeding shell, with a sleeve integrally connected to the right side of the feeding shell. The inside of the sleeve is rotatably connected to the left end of the feeding pipe via a bearing. A feeding hopper is connected to the upper end of the feeding shell. A discharge hole communicating with the feeding pipe is provided on the right side of the feeding shell. A feeding motor is installed on the left side of the feeding shell, and an auger is connected to the output end of the feeding motor. The auger is located inside the feeding shell and the feeding pipe.

[0013] In a further preferred embodiment, a drive gear ring is installed on the middle of the outer side of the rotary kiln body, and slip rings are symmetrically installed on the outer side of the rotary kiln body.

[0014] In a further preferred embodiment, the rotation direction of the blocking mechanism is the same as the rotation direction of the rotary kiln body, and the rotation speed of the blocking mechanism is 1.1-1.5 times the rotation speed of the rotary kiln body.

[0015] The advantages and beneficial effects of this invention are as follows: 1. After the drive assembly drives the toothed ring and the feed pipe of its inner cavity to rotate, the feed pipe drives the entire blocking mechanism to rotate. The scraper of the blocking mechanism scrapes off the scale on the inner wall of the rotary kiln. When the scraper rotates, it breaks down the scale into large lumps, effectively improving the scraping effect of calcium salt scale on the rotary kiln wall. When the dispersion rod on the arc support plate rotates synchronously with it, it rotates and collides the lumps to break them up, preventing the interior from not being dried quickly, thus indirectly improving the drying effect of the drying kiln. 2. Hot steam is introduced through the steam pipe of the blocking mechanism. After passing through the steam pipe and the round hole, the hot steam enters multiple L-shaped channels and then is discharged into multiple hollow rods to facilitate heating of the hollow rods and scrapers. This allows the hollow rods and scrapers to indirectly exchange heat with the wet ash to be dried during the rotation process, effectively heating the material while descaling, increasing the heat transfer area, and increasing the drying efficiency of the rotary drying kiln. 3. By designing the blocking mechanism to rotate in the same direction as the rotary kiln body, and with the blocking mechanism rotating at a higher speed than the rotary kiln body, the differential rotation principle allows for more effective and proactive scraping of calcium salt scale on the rotary kiln wall. This significantly improves the scraping efficiency of calcium salt scale and eliminates the need for frequent shutdowns for cleaning. The speed difference between the blocking mechanism and the rotary kiln body can be adjusted according to the calcium salt content of the fly ash to ensure effective scale removal under different operating conditions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall three-dimensional structure proposed in this invention; Figure 2 This is a partial cross-sectional three-dimensional structural schematic diagram of the invention. Figure 3 This is a cross-sectional perspective view of the feed assembly proposed in this invention. Figure 4 This is a three-dimensional structural diagram of the anti-clogging mechanism proposed in this invention; Figure 5 This is a cross-sectional three-dimensional structural diagram of part of the anti-clogging mechanism proposed in this invention.

[0017] In the diagram: 1. Rotary kiln body; 2. Front annular hood; 3. Rear annular hood; 4. Ring plate; 5. Feeding assembly; 51. Feed shell; 52. Feed hopper; 53. Feeding motor; 54. Screw conveyor; 55. Sleeve; 56. Bearing; 57. Feed pipe; 58. Gear ring; 6. Drive assembly; 61. Drive motor; 62. Rotating shaft; 63. Gear; 7. Anti-clogging mechanism; 71. Fixed plate; 72. Through hole; 73. Base; 74. Hollow rod; 75. Scraper; 76. Arc-shaped support plate; 77. Dispersing rod; 78. Scraper bar; 79. L-shaped channel; 710, round hole; 711, steam pipe; 712, solenoid valve; 713, limit ring; 8, first drain pipe; 9, discharge pipe; 10, drive gear ring; 11, slip ring; 12, bearing seat; 13, second drain pipe; 14, reinforcing plate; 15, annular groove. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0019] Reference Figure 1-5 An anti-clogging structure for a rotary kiln for washing fly ash includes a rotary kiln body 1. A front annular cover 2 and a rear annular cover 3 are respectively sleeved at both ends of the rotary kiln body 1. Two sets of annular plates 4 are movably sleeved on the outer side of the rotary kiln body 1. The two sets of annular plates 4 are respectively connected to the front annular cover 2 and the rear annular cover 3. An anti-clogging mechanism 7 is provided in the inner cavity of the rotary kiln body 1. One end of the anti-clogging mechanism 7 is connected to a feeding assembly 5. The feeding assembly 5 includes a feeding pipe 57. A gear ring 58 is installed on the outer side of the feeding pipe 57. A drive assembly 6 meshes with the outer side of the gear ring 58. The drive assembly 6 includes a drive motor 61. The output end of the drive motor 61 is connected to a rotating shaft 62. A gear 63 that meshes with the gear ring 58 is installed on the outer side of the rotating shaft 62.

[0020] The output of the drive motor 61 drives the rotating shaft 62 to rotate, which in turn drives the gear 63 to rotate. The gear ring 58, which meshes with the gear 63, rotates synchronously with the gear 63 and simultaneously drives the feed pipe 57 to rotate. The feed pipe 57 then drives the anti-clogging mechanism 7 to rotate, which facilitates the anti-clogging mechanism 7 to scrape off the scale buildup on the inner wall of the rotary kiln 1 in real time. This avoids a decrease in the heat transfer efficiency of the rotary kiln 1 and effectively avoids the need for frequent shutdowns for cleaning, thus indirectly improving the drying efficiency of the rotary kiln 1.

[0021] The blocking mechanism 7 includes a fixed plate 71, the middle of which is fixedly inserted into the feed pipe 57. Hollow rods 74 are equidistantly connected to one side of the fixed plate 71. Scraper rods 75 are integrally connected to the outer sides of each hollow rod 74. The right ends of multiple hollow rods 74 are connected to a base 73. L-shaped channels 79 corresponding to the positions of the hollow rods 74 are equidistantly arranged inside the base 73. A circular hole 710 communicating with the L-shaped channel 79 is provided at the right end of the base 73. The outer end of the fixed plate 71 is equidistantly arranged with holes corresponding to the hollow rods. The left end of the fixed plate 71 is equidistantly connected to the through hole 72 corresponding to the position of the through hole 72. The second drain pipe 13 is located in the inner cavity of the front annular cover 2. The lower outer part of the front annular cover 2 is connected to the first drain pipe 8. The inner cavity of the round hole 710 is equipped with a steam pipe 711. The base 73 is located in the inner cavity of the rear annular cover 3. The right end of the steam pipe 711 passes through the rear annular cover 3 and extends to its outer side, where a solenoid valve 712 is installed. The lower outer part of the rear annular cover 3 is connected to the discharge pipe 9.

[0022] The feed pipe 57 drives the anti-clogging mechanism 7 to rotate, causing the fixed plate 71, hollow rods 74, scraper rods 75, base 73, steam pipe 711, and first drain pipe 8 to rotate synchronously with the feed pipe 57. The scraper rods 75 on the outer sides of the multiple hollow rods 74 scrape away the scale buildup on the inner wall of the rotary kiln 1. Simultaneously, an external hot steam delivery device connects the steam pipe 711 via a rotating pipe. Then, the solenoid valve 712 is opened, delivering hot steam to the inner cavity of the steam pipe 711. The hot steam passes through the steam pipe 711 and the round hole 710, then enters multiple L-shaped channels 79, and finally drains into the multiple hollow rods 74, facilitating the heating of the hollow rods 74 and scraper rods 75. The hollow rod 74 and scraper 75 indirectly exchange heat with the wet ash to be dried during rotation, effectively heating the material while descaling, increasing the heat transfer area, and improving the drying efficiency of the rotary kiln. The hot steam inside the hollow rod 74 cools into condensate after heat exchange, then enters the through hole 72 through the hollow rod 74, and is finally discharged into the inner cavity of the front annular cover 2 through the second drain pipe 13, and then discharged through the first drain pipe 8. The condensate is collected and treated by an external condensate collection device. The dried fly ash enters the inner cavity of the rear annular cover 3, and is then discharged and collected through the discharge pipe 9. The drying and discharge of fly ash by the rotary kiln body 1 is an existing technology and will not be described in detail here.

[0023] The blocking mechanism 7 rotates in the same direction as the rotary kiln body 1, and the rotation speed of the blocking mechanism 7 is 1.1-1.5 times that of the rotary kiln body 1.

[0024] After the drive assembly 6 drives the gear ring 58 and the feed pipe 57 inside the cavity to rotate, the feed pipe 57 drives the entire blocking mechanism 7 to rotate. The blocking mechanism 7 is designed to rotate in the same direction as the rotary kiln body 1, and the rotation speed of the blocking mechanism 7 is higher than that of the rotary kiln body 1. Through the principle of differential rotation between them, the blocking mechanism 7 can more effectively and actively scrape off the calcium salt scale on the rotary kiln wall, effectively improving the scraping efficiency of calcium salt scale, and eliminating the need for frequent shutdowns for cleaning. This effectively improves the performance of this anti-clogging structure. The rotation speed of the blocking mechanism 7 is controlled by adjusting the rotation speed of the drive motor 61. The specific speed adjustment can be adjusted according to the calcium salt content of the fly ash to adjust the differential speed ratio between the rotation speed of the blocking mechanism 7 and the rotation speed of the rotary kiln body 1, so as to effectively ensure the scale removal effect under different working conditions.

[0025] Multiple scraper strips 78 are equidistantly connected to both sides of the scraper rod 75. Three sets of arc-shaped support plates 76 are equidistantly connected between each adjacent hollow rod 74. Dispersing rods 77 are equidistantly connected to the inner side of the arc-shaped support plate 76.

[0026] The scraper bars 78 designed on both sides of the scraper 75 facilitate the removal of calcium salt scale by preventing it from agglomerating into large lumps. The rotating scraper bars 78 break up these large lumps, preventing direct contact between the scraper 75 and the scale, which could cause excessive pressure and damage to the equipment and structure. This effectively improves the efficiency of the clogging mechanism 7 in removing calcium salt scale from the rotary kiln wall. Furthermore, the arc-shaped support plates 76 installed between the hollow rods 74 enhance the connection strength between them, increasing the stability and firmness of the scraper 75 as it rotates. The dispersing rods 77 on the arc-shaped support plates 76, rotating synchronously with the scale, further break up the agglomerated material through rotational collision, preventing it from failing to dry quickly and indirectly improving the drying effect of the kiln.

[0027] The inner wall of the rear annular cover 3 is provided with an annular groove 15. The right end of the base 73 is integrally connected with a limiting ring 713 that slides with it. When the base 73 rotates, the limiting ring 713 on the outside of the base 73 limits the rotation within the cavity of the annular groove 15, which effectively improves the rotational stability of the base 73 and the entire blocking mechanism 7.

[0028] Multiple sets of reinforcing plates 14 are welded together between the feed pipe 57 and the fixed plate 71. A bearing seat 12 is installed in the middle of the front annular cover 2. The feed pipe 57 is rotatably connected to the bearing seat 12. The rotatable connection between the feed pipe 57 and the bearing seat 12 in the middle of the front annular cover 2 effectively improves the rotational stability of the blocking mechanism 7 driven by the feed pipe 57. In addition, the reinforcing plate 14 designed between the feed pipe 57 and the fixed plate 71 effectively increases the connection strength between the feed pipe 57 and the fixed plate 71, thereby increasing the stability of the blocking mechanism 7 in rotating and scraping scale.

[0029] The feeding assembly 5 also includes a feeding shell 51. A sleeve 55 is integrally connected to the right side of the feeding shell 51. The inside of the sleeve 55 is rotatably connected to the left end of the feeding pipe 57 through a bearing 56. A feeding hopper 52 is connected to the upper end of the feeding shell 51. A discharge hole communicating with the feeding pipe 57 is provided on the right side of the feeding shell 51. A feeding motor 53 is installed on the left side of the feeding shell 51. An auger 54 is connected to the output end of the feeding motor 53. The auger 54 is located in the inner cavity of the feeding shell 51 and the feeding pipe 57.

[0030] By pouring wet ash into the feed hopper 52, it enters the inner cavity of the feed shell 51. The output end of the feed motor 53 drives the auger 54 to rotate, and the auger 54 drives the wet ash to be transported until the wet ash is discharged from the feed pipe 57 into the inner cavity of the rotary kiln body 1, which facilitates automated feeding.

[0031] A drive gear ring 10 is installed on the middle of the outer side of the rotary kiln body 1, and slip rings 11 are symmetrically installed on the outer side of the rotary kiln body 1.

[0032] The drive gear ring 10 on the outside of the rotary kiln body 1 meshes with the external drive device, while the slip ring 11 works in conjunction with the external support roller device. This is an existing technology. In this embodiment, the feeding assembly 5 and the drive assembly 6 are both mounted and supported by an external mounting bracket. The feeding motor 53, the drive motor 61, and the solenoid valve 712 are all programmed and controlled by an external controller. This is an existing PLC control programming technology, which will not be elaborated on here.

[0033] Working principle: In use, wet ash is poured into the feed hopper 52, thus entering the inner cavity of the feed shell 51. The output of the feed motor 53 drives the auger 54 to rotate, which in turn drives the wet ash to be conveyed until it is discharged from the feed pipe 57 into the inner cavity of the rotary kiln 1. The output of the drive motor 61 drives the rotating shaft 62 to rotate, and the gear 63 on its outer side to rotate. The gear 63 drives the gear ring 58 and the feed pipe 57 in its inner cavity to rotate. The feed pipe 57 drives the anti-blocking mechanism 7 to rotate. The fixed plate 71 and the empty... The core rod 74, scraper 75, base 73, steam pipe 711, and first drain pipe 8 all rotate synchronously with the feed pipe 57. The scraper 75 on the outer side of the multiple hollow rods 74 scrapes away the scale buildup on the inner wall of the rotary kiln 1. At the same time, through an external hot steam conveying device, a connecting pipe is rotatably connected to the steam pipe 711. Then, the solenoid valve 712 is opened to deliver hot steam to the inner cavity of the steam pipe 711. The hot steam passes through the steam pipe 711 and the round hole 710 and enters multiple L-shaped channels 79, and then discharges into the multiple hollow rods 74. This design facilitates heating of the hollow rod 74 and scraper 75, allowing indirect heat exchange between them and the wet ash to be dried during rotation. This effectively heats the material while descaling, increasing the heat transfer area and improving the drying efficiency of the rotary kiln. The hot steam inside the hollow rod 74 cools into condensate after heat exchange, then enters the through hole 72 through the hollow rod 74, and is finally discharged into the inner cavity of the front annular cover 2 through the second drain pipe 13, and then discharged through the first drain pipe 8. The condensate is collected and treated by an external condensate collection device. The scraper 74... 5. When rotating, the scraper 78 is driven to break down the scale agglomerates into large lumps, avoiding direct contact between the scraper 75 and the large lumps during rotation, which would cause excessive direct collision and extrusion pressure and easily damage the equipment and structure. This effectively improves the scraping effect of the clogging mechanism 7 on removing calcium salt scale from the rotary kiln wall. Furthermore, the dispersing rod 77 on the arc-shaped support plate 76 rotates synchronously with it, causing the agglomerated material to be broken up by rotation and collision, preventing the internal drying process from being hindered. This effectively and indirectly improves the drying effect of the drying kiln.

[0034] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A clog-resistant structure for a rotary kiln for washing fly ash, comprising a rotary kiln body, characterized in that, The rotary kiln body is fitted with a front annular cover and a rear annular cover at both ends, and two sets of ring plates are movably fitted on the outer side of the rotary kiln body. The two sets of ring plates are connected to the front annular cover and the rear annular cover, respectively. The inner cavity of the rotary kiln body is provided with an anti-blocking mechanism, and one end of the anti-blocking mechanism is connected to a feeding assembly. The feeding assembly includes a feeding pipe, a toothed ring is mounted on the outside of the feeding pipe, and a drive assembly is engaged on the outside of the toothed ring. The blocking mechanism includes a fixed plate, the middle of which is fixedly inserted into the feed pipe. Hollow rods are equidistantly connected to one side of the fixed plate. Scraper rods are integrally connected to the outer sides of each hollow rod. The right ends of multiple hollow rods are connected to a base. L-shaped channels corresponding to the positions of the hollow rods are equidistantly arranged inside the base. A circular hole communicating with the L-shaped channels is provided at the right end of the base.

2. The anti-clogging structure of a rotary dryer for water-washed fly ash according to claim 1, characterized in that, The outer end of the fixed plate is provided with through holes at equal intervals corresponding to the position of the hollow rod. The left end of the fixed plate is connected with a second drain pipe at equal intervals corresponding to the position of the through holes. The second drain pipe is located in the inner cavity of the front annular cover. The lower outer part of the front annular cover is connected with a first drain pipe.

3. The anti-clogging structure of a rotary drying kiln for water-washed fly ash according to claim 1, characterized in that, A steam pipe is installed in the inner cavity of the circular hole. The base is located in the inner cavity of the rear annular cover. The right end of the steam pipe passes through the rear annular cover and extends to its outer side where a solenoid valve is installed. A discharge pipe is connected to the lower outer side of the rear annular cover.

4. The anti-clogging structure of a rotary dryer for water-washed fly ash according to claim 1, characterized in that, Multiple scraper strips are equidistantly connected to both sides of the scraper rod, and three sets of arc-shaped support plates are equidistantly connected between each adjacent hollow rod. Dispersing rods are equidistantly connected to the inner side of the arc-shaped support plates.

5. The anti-clogging structure of a rotary drying kiln for water-washed fly ash according to claim 3, characterized in that, The inner wall of the rear annular cover is provided with an annular groove, and the right end of the base is integrally connected with a limiting ring that slides with it.

6. The anti-clogging structure of a rotary dryer for water-washed fly ash according to claim 1, characterized in that, Multiple sets of reinforcing plates are welded together between the feed pipe and the fixed plate. A bearing seat is installed in the middle of the front annular cover, and the feed pipe is rotatably connected to the bearing seat.

7. The anti-clogging structure of a rotary drying kiln for water-washed fly ash according to claim 1, characterized in that, The drive assembly includes a drive motor, the output end of which is connected to a rotating shaft, and a gear that meshes with a gear ring is mounted on the outer side of the rotating shaft.

8. The anti-clogging structure of a rotary drying kiln for water-washed fly ash according to claim 1, characterized in that, The feeding assembly also includes a feeding shell, with a sleeve integrally connected to the right side of the feeding shell. The inside of the sleeve is rotatably connected to the left end of the feeding pipe via a bearing. A feeding hopper is connected to the upper end of the feeding shell. A discharge hole communicating with the feeding pipe is provided on the right side of the feeding shell. A feeding motor is installed on the left side of the feeding shell, and an auger is connected to the output end of the feeding motor. The auger is located in the inner cavity of the feeding shell and the feeding pipe.

9. The anti-clogging structure of a rotary drying kiln for water-washed fly ash according to claim 1, characterized in that, A drive gear ring is installed on the middle of the outer side of the rotary kiln body, and slip rings are symmetrically installed on the outer side of the rotary kiln body.

10. The anti-clogging structure of a rotary dryer for water-washed fly ash according to claim 1, characterized in that, The blocking mechanism rotates in the same direction as the rotary kiln body, and the rotation speed of the blocking mechanism is 1.1-1.5 times that of the rotary kiln body.

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