A raw material dispersing device and raw material preheating process

Abstract

The present invention belongs to the technical field of cement production and processing, and specifically relates to a raw material dispersing device and a raw material preheating process, comprising: a first connecting pipe; a second connecting pipe, located below the first connecting pipe, the upper end of the second connecting pipe is provided with a funnel-shaped cavity, and the lower end of the first connecting pipe is inserted into the funnel-shaped cavity; an annular turntable, located in the funnel-shaped cavity and rotatably connected with the first connecting pipe; a driving mechanism, used to drive the annular turntable to rotate along a preset rotation direction; a feed pipe, arranged on the top wall of the funnel-shaped cavity; a baffle plate, installed on the top wall of the funnel-shaped cavity, and the lower end of the baffle plate has a bottom edge in contact with the top surface of the annular turntable. The present invention uses an annular turntable to first transport the raw material to the surroundings of the pipeline, and then uses the baffle plate to guide the material to fall synchronously in the circumferential direction of the pipeline, ensuring that the material can be fully dispersed, improving the uniformity of mixing the raw material with the hot air flow, thereby improving the preheating efficiency and energy utilization.

Description

Technical Field

[0001] The invention belongs to the technical field of cement production and processing, and particularly relates to a raw material dispersing device and a raw material preheating process. Background Art

[0002] Cement raw meal preheater is an important equipment in the cement production process, used to improve production efficiency and save energy; cement raw meal preheater mainly includes preheater tower, feeding system, combustion system, smoke exhaust system, etc.; preheater tower is the core part of the preheater, usually composed of multiple cascaded preheating chambers; feeding system is used to feed raw materials into the preheater tower, usually through a screw conveyor or air flow conveying system; combustion system is used to generate heat, usually a pulverized coal burner or a natural gas burner; smoke exhaust system discharges the preheated flue gas out of the tower, usually including a flue gas induced draft fan and a smoke exhaust duct. The ground raw meal (mainly a mixture of limestone, clay, etc.) enters the preheater tower through the feeding system, and the combustion system at the bottom of the tower burns to produce high-temperature gas. The hot air flow passes through multiple preheating sections from bottom to top and contacts with the raw meal flowing downward; in the preheating section, the hot air flow gradually heats the raw meal, and the temperature of the raw meal gradually rises in different sections; the waste gas in the preheater is led out through the smoke exhaust system and treated in subsequent processes. By preheating the raw meal, the amount of heat required to be heated in the rotary kiln can be significantly reduced, thereby reducing energy consumption.

[0003] The raw meal is generally fed into the preheater through a spreader. However, the spreader in the prior art can generally only feed from one side of the preheater pipe. After the raw meal enters the preheater pipe, it will agglomerate together and cannot fully exchange heat with the hot air flow, resulting in poor preheating uniformity, low preheating efficiency, and high energy loss. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a raw meal dispersing device and a raw meal preheating process which can improve the raw meal preheating efficiency and preheating uniformity.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a raw material dispersing device, comprising:

[0006] a first connecting pipe;

[0007] A second connecting pipe is located below the first connecting pipe, the upper end of the second connecting pipe is provided with a funnel-shaped cavity, and the lower end of the first connecting pipe is inserted into the funnel-shaped cavity;

[0008] An annular rotating disk is located in the funnel-shaped cavity and is rotatably connected to the first connecting pipe, and an annular material leakage port is provided between the outer edge of the annular rotating disk and the inner wall of the funnel-shaped cavity;

[0009] A driving mechanism, used for driving the annular turntable to rotate along a preset rotation direction;

[0010] A feed pipe is arranged on the top wall of the funnel-shaped cavity, and the lower end of the feed pipe is arranged opposite to the top surface of the annular turntable;

[0011] A baffle plate is installed on the top wall of the funnel-shaped cavity, and the lower end of the baffle plate has a bottom edge that contacts the top surface of the annular turntable; multiple baffle plates are arranged at intervals along the circumference of the annular turntable, and in the preset rotation direction, the baffle plate located downstream of the feed pipe and adjacent to the feed pipe is the first baffle plate, and the baffle plate located upstream of the feed pipe and adjacent to the feed pipe is the Kth baffle plate; the first end of the bottom edge of each baffle plate is flush with the outer edge of the annular turntable, and in the preset rotation direction, from the first baffle plate to the Kth baffle plate, the distance from the second end of the bottom edge of each baffle plate to the center of the annular turntable gradually decreases; the baffle plate is arranged to be inclined relative to the radial direction of the annular turntable in the horizontal direction, so that when the annular turntable rotates along the preset rotation direction, the baffle plate can push the material on the annular turntable to the outer edge side of the annular turntable.

[0012] In an optional embodiment of the present invention, a sleeve is provided on the inner edge of the annular turntable, and the sleeve is rotatably connected to the first connecting pipe via a bearing; sliding sealing rings are provided between the upper and lower ends of the inner wall of the sleeve and the first connecting pipe.

[0013] In an optional embodiment of the present invention, the driving mechanism includes a motor reducer assembly installed on the outer wall of the first connecting tube, a driving gear is provided at the power output end of the motor reducer assembly, and a driven gear is provided on the outer wall of the sleeve, and the driven gear is meshed with the driving gear.

[0014] In an optional embodiment of the present invention, a strip slot is provided on the top wall of the funnel-shaped cavity, the material baffle plate is inserted into the strip slot, an elastic clamping mechanism is provided on the side of the strip slot, and the elastic clamping mechanism is assembled to be able to apply an elastic clamping force to the upper end of the material baffle plate and to be able to be removed from the upper end of the material baffle plate.

[0015] In an optional embodiment of the present invention, the elastic clamping mechanism includes a guide column, a pressure block, an elastic element and a nut; the guide column is fixedly arranged on the top wall of the funnel-shaped cavity, the pressure block is slidably connected to the guide column and can rotate relative to the guide column, the upper end of the guide column is provided with an external thread, the nut is connected to the external thread, the elastic element is arranged between the nut and the pressure block, and the pressure block is provided with a cantilever, when the pressure block rotates relative to the guide column, the cantilever can be moved to above the material baffle plate, or removed from above the material baffle plate.

[0016] In an optional embodiment of the present invention, a groove matching the shape of the top surface of the material blocking plate is provided at the bottom of the cantilever.

[0017] In an optional embodiment of the present invention, in the preset rotation direction, from the first baffle plate to the Kth baffle plate, the difference in distance between the second end of the bottom edge of each adjacent baffle plate and the center of the annular turntable gradually increases.

[0018] In an optional embodiment of the present invention, the lower end opening of the feed pipe is fan-shaped.

[0019] In an optional embodiment of the present invention, a dividing plate is provided on the conical side wall of the funnel-shaped cavity, and the dividing plate has an inverted V-shaped side wall that is narrow at the top and wide at the bottom. A plurality of the dividing plates are arranged at intervals along the circumference of the funnel-shaped cavity, and the upper end of each of the dividing plates corresponds one-to-one to the first end of each of the baffle plates.

[0020] To achieve the above-mentioned object and other related objects, the present invention also provides a raw material preheating process, using the raw material dispersing device, comprising the following steps:

[0021] Connecting the raw material dispersing device in series to the preheater pipeline via the first connecting pipe and the second connecting pipe;

[0022] The raw meal is fed into the preheater pipeline through the raw meal dispersing device.

[0023] The technical effect of the present invention is that the present invention utilizes an annular turntable to first transport the raw material to the periphery of the pipeline, and then utilizes a baffle plate to guide the material to fall synchronously in the circumferential direction of the pipeline, thereby ensuring that the material can be fully dispersed, improving the uniformity of mixing the raw material and the hot air flow, and thus improving the preheating efficiency and energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional diagram of a raw material dispersing device provided by an embodiment of the present invention;

[0025] Figure 2 is a top view of a raw material dispersing device provided by an embodiment of the present invention;

[0026] Figure 3 yes Figure 2 AA section view;

[0027] Figure 4 yes Figure 3 BB cross-sectional view;

[0028] Figure 5 yes Figure 3 CC section view;

[0029] Figure 6It is a schematic diagram of the coordination structure between the annular turntable and the baffle plate provided in an embodiment of the present invention;

[0030] Figure 7 yes Figure 1 I partial enlarged view;

[0031] Explanation of the reference numerals in the accompanying drawings: 10, first connecting pipe; 20, second connecting pipe; 21, funnel-shaped cavity; 22, dividing plate; 30, annular turntable; 31, sleeve; 32, bearing; 33, sliding sealing ring; 34, driven gear; 40, driving mechanism; 41, driving gear; 50, feed pipe; 60, material baffle plate; 61, first material baffle plate; 62, Kth material baffle plate; 70, guide column; 71, pressure block; 72, elastic element; 73, nut. DETAILED DESCRIPTION

[0032] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0033] It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present invention in a schematic manner, and thus the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0034] See also Figures 1 to 7 As shown, the technical solution of the present invention is described in detail below in conjunction with specific embodiments:

[0035] See also Figures 1 to 4 As shown, the raw material dispersing device provided by the embodiment of the present invention includes a first connecting pipe 10 , a second connecting pipe 20 , an annular turntable 30 , a driving mechanism 40 , a feed pipe 50 and a baffle plate 60 .

[0036] See also Figure 3 As shown, the second connecting pipe 20 is located below the first connecting pipe 10, and the upper end of the second connecting pipe 20 is provided with a funnel-shaped cavity 21, and the lower end of the first connecting pipe 10 is inserted into the funnel-shaped cavity 21. It should be understood that the first connecting pipe 10 and the second connecting pipe 20 are respectively used to connect the pipeline of the preheater, so that the raw material dispersion device can be connected in series to the pipeline of the preheater.

[0037] See also Figure 3 , Figure 4 As shown, the annular turntable 30 is located in the funnel-shaped cavity 21 and is rotatably connected to the first connecting pipe 10. An annular material leakage port is provided between the outer edge of the annular turntable 30 and the inner wall of the funnel-shaped cavity 21. The driving mechanism 40 is used to drive the annular turntable 30 to rotate along a preset rotation direction. In a specific embodiment, the preset rotation direction is Figure 4 , Figure 6 The direction indicated by the arrow is the clockwise direction. It should be understood that the definition of the preset rotation direction is only for the convenience of describing the relationship between the shape of the baffle plate 60 and the movement mode of the annular turntable 30. There is no special limitation on its absolute direction. For example, in some other embodiments, the preset rotation direction may also be the counterclockwise direction. In this case, the shape of the baffle plate 60 should also be synchronously reversed. The feed pipe 50 is arranged on the top wall of the funnel-shaped cavity 21, and the lower end of the feed pipe 50 is arranged opposite to the top surface of the annular turntable 30.

[0038] See also Figure 2 , Figure 3 , Figure 4 , Figure 6 As shown, the baffle plate 60 is installed on the top wall of the funnel-shaped cavity 21, and the lower end of the baffle plate 60 has a bottom edge in contact with the top surface of the annular turntable 30; a plurality of the baffle plates 60 are arranged at intervals along the circumference of the annular turntable 30, and in the preset rotation direction, the baffle plate 60 located downstream of the feed pipe 50 and adjacent to the feed pipe 50 is the first baffle plate 61, and the baffle plate 60 located upstream of the feed pipe 50 and adjacent to the feed pipe 50 is the Kth baffle plate 62, where K is a positive integer; each of the baffle plates The first end of the bottom edge of 60 is flush with the outer edge of the annular turntable 30, and in the preset rotation direction, from the first baffle plate 61 to the Kth baffle plate 62, the distance from the second end of the bottom edge of each baffle plate 60 to the center of the annular turntable 30 gradually decreases; the baffle plate 60 is arranged to be inclined relative to the radial direction of the annular turntable 30 in the horizontal direction, so that when the annular turntable 30 rotates along the preset rotation direction, the baffle plate 60 can push the material on the annular turntable 30 to the outer edge side of the annular turntable 30.

[0039] The main working principle of the raw meal dispersion device is as follows:

[0040] See also Figure 3 As shown, the material first enters the funnel-shaped cavity 21 from the feed pipe 50 and falls on the annular turntable 30. The drive mechanism 40 drives the annular turntable 30 to rotate along a preset rotation direction, that is, Figure 4In the clockwise direction shown, the materials will be evenly distributed on the annular turntable 30. For the convenience of subsequent understanding, the annular turntable 30 can be divided into a plurality of concentric rings, and each baffle plate 60 is responsible for pushing the materials on one of the rings away to the edge of the annular turntable 30. For example, during the rotation of the annular turntable 30, the materials on the outermost ring are first pushed away to the edge of the annular turntable 30 by the first baffle plate 61, while the materials on the other rings continue to rotate with the annular turntable 30. Since the materials on the outermost ring have been cleared by the first baffle plate 61, the second baffle plate 60 will only push the materials on the second outer ring to the edge of the annular turntable 30. By analogy, the Kth baffle plate 62 will push the materials on the innermost ring to the edge of the annular turntable 30. The linear velocity of the ring channel is greater than the linear velocity of the inner ring channel. Therefore, as long as the width of each channel is gradually increased from the outside to the inside, it can be ensured that the speed of each baffle plate 60 to remove the material remains consistent, and the width of each channel can be achieved by adjusting the length of each baffle plate 60. For example, in the preset rotation direction, from the first baffle plate 61 to the Kth baffle plate 62, the difference in distance between the second end of the bottom edge of each adjacent baffle plate 60 and the center of the annular turntable 30 can be gradually increased, so that the width of each channel can be gradually increased from the outside to the inside; after the material falls from the edge of the annular turntable 30, it will slide down along the conical inner wall of the funnel-shaped cavity 21 until it falls into the preheater pipe. In summary, it is possible to achieve equal material discharge at multiple points on the circumference of the pipe, and improve the uniformity of mixing the material and the hot air flow.

[0041] See also Figure 3 As shown, in an optional embodiment of the present invention, a sleeve 31 is provided on the inner edge of the annular turntable 30, and the sleeve 31 is rotatably connected to the first connecting pipe 10 through a bearing 32; a sliding sealing ring 33 is provided between the upper and lower ends of the inner wall of the sleeve 31 and the first connecting pipe 10.

[0042] See also Figure 1 , Figure 3 As shown, in an optional embodiment of the present invention, the driving mechanism 40 includes a motor reducer assembly installed on the outer wall of the first connecting tube 10, a driving gear 41 is provided at the power output end of the motor reducer assembly, and a driven gear 34 is provided on the outer wall of the sleeve 31, and the driven gear 34 is meshed with the driving gear 41.

[0043] See also Figure 7As shown, in an optional embodiment of the present invention, a strip slot is provided on the top wall of the funnel-shaped cavity 21, and the material baffle plate 60 is inserted into the strip slot. An elastic clamping mechanism is provided on the side of the strip slot, and the elastic clamping mechanism is assembled to be able to apply an elastic clamping force to the upper end of the material baffle plate 60 and to be able to be removed from the upper end of the material baffle plate 60. Specifically, the elastic clamping mechanism includes a guide post 70, a pressure block 71, an elastic element 72 and a nut 73; the guide post 70 is fixedly arranged on the top wall of the funnel-shaped cavity 21, the pressure block 71 is slidably connected to the guide post 70 and can rotate relative to the guide post 70, the upper end of the guide post 70 is provided with an external thread, the nut 73 is connected to the external thread, the elastic element 72 is arranged between the nut 73 and the pressure block 71, and a cantilever is provided on the pressure block 71, when the pressure block 71 rotates relative to the guide post 70, the cantilever can be moved to the top of the baffle plate 60, or removed from the top of the baffle plate 60. The bottom of the cantilever is provided with a groove matching the shape of the top surface of the baffle plate 60.

[0044] It should be understood that the long-term sliding friction between the baffle plate 60 and the annular turntable 30 will cause the baffle plate 60 to wear out. The present invention sets an elastic clamping mechanism above the baffle plate 60 to ensure that the baffle plate 60 can always be in close contact with the annular turntable 30; in addition, the present invention rotates the pressing block 71 to facilitate the removal and replacement of the baffle plate 60. The specific process is: lift the pressing block 71 upward and rotate it to a certain angle to remove the cantilever from the baffle plate 60. At this time, the baffle plate 60 can be pulled out, and after replacing the new baffle plate 60, the cantilever is rotated to the top of the baffle plate 60, and the pressing block 71 is released. The cantilever can re-press the baffle plate 60 under the action of the elastic element 72, thereby improving the equipment maintenance efficiency. By rotating the nut 73, the force with which the baffle plate 60 is pressed can also be adjusted.

[0045] See also Figure 4 As shown, in an optional embodiment of the present invention, the lower end of the feed pipe 50 is fan-shaped, which can make the material more evenly distributed on the annular turntable 30.

[0046] See also Figure 3 , 5 As shown, in an optional embodiment of the present invention, a dividing plate 22 is provided on the conical side wall of the funnel-shaped cavity 21, and the dividing plate 22 has an inverted V-shaped side wall that is narrow at the top and wide at the bottom. A plurality of the dividing plates 22 are arranged at intervals along the circumference of the funnel-shaped cavity 21, and the upper end of each of the dividing plates 22 corresponds to the first end of each of the baffle plates 60. It should be understood that the dividing plate 22 can further disperse the material during the process of sliding down along the conical side wall.

[0047] The present invention also provides a raw material preheating process, which utilizes the raw material dispersing device and comprises the following steps:

[0048] Connecting the raw material dispersing device in series to the preheater pipeline via the first connecting pipe 10 and the second connecting pipe 20;

[0049] The raw meal is fed into the preheater pipeline through the raw meal dispersing device.

[0050] To sum up, the present invention utilizes an annular turntable to first transport the raw material to the periphery of the pipeline, and then utilizes a baffle plate to guide the material to fall synchronously in the circumferential direction of the pipeline, thereby ensuring that the material can be fully dispersed, thereby improving the uniformity of mixing the raw material and the hot air flow, thereby improving the preheating efficiency and energy utilization rate; the present invention arranges an elastic clamping mechanism above the baffle plate, which can ensure that the baffle plate can always be in close contact with the annular turntable; in addition, the present invention arranges the pressing block to rotate, which is convenient for disassembly and replacement of the baffle plate.

[0051] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

[0052] In the description herein, many specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of the specific details or with other devices, systems, components, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

Claims

1. A raw material dispersing device, characterized in that: include: A first connecting pipe (10); A second connecting tube (20) is located below the first connecting tube (10), the upper end of the second connecting tube (20) is provided with a funnel-shaped cavity (21), and the lower end of the first connecting tube (10) is inserted into the funnel-shaped cavity (21); an annular rotating disk (30) located in the funnel-shaped cavity (21) and rotatably connected to the first connecting pipe (10); an annular material leakage port is provided between the outer edge of the annular rotating disk (30) and the inner wall of the funnel-shaped cavity (21); A driving mechanism (40) for driving the annular turntable (30) to rotate along a preset rotation direction; A feed pipe (50) is arranged on the top wall of the funnel-shaped cavity (21), and the lower end of the feed pipe (50) is arranged opposite to the top surface of the annular turntable (30); A baffle plate (60) is mounted on the top wall of the funnel-shaped cavity (21), and the lower end of the baffle plate (60) has a bottom edge that contacts the top surface of the annular turntable (30); a plurality of the baffle plates (60) are arranged at intervals along the circumference of the annular turntable (30); in the preset rotation direction, the baffle plate (60) located downstream of the feed pipe (50) and adjacent to the feed pipe (50) is the first baffle plate (61), and the baffle plate (60) located upstream of the feed pipe (50) and adjacent to the feed pipe (50) is the Kth baffle plate (62); each of the baffle plates (60) ) is flush with the outer edge of the annular turntable (30); in the preset rotation direction, from the first baffle plate (61) to the Kth baffle plate (62), the distance from the second end of the bottom edge of each baffle plate (60) to the center of the annular turntable (30) gradually decreases; the baffle plates (60) are arranged to be inclined relative to the radial direction of the annular turntable (30) in the horizontal direction, so that when the annular turntable (30) rotates along the preset rotation direction, the baffle plates (60) can push the material on the annular turntable (30) toward the outer edge of the annular turntable (30).

2. The raw material dispersing device according to claim 1, characterized in that: A sleeve (31) is provided on the inner edge of the annular rotating disk (30), and the sleeve (31) is rotatably connected to the first connecting pipe (10) via a bearing (32); a sliding sealing ring (33) is provided between the upper and lower ends of the inner wall of the sleeve (31) and the first connecting pipe (10).

3. The raw material dispersing device according to claim 2, characterized in that: The driving mechanism (40) comprises a motor reducer assembly mounted on the outer wall of the first connecting tube (10), a driving gear (41) being provided at the power output end of the motor reducer assembly, and a driven gear (34) being provided on the outer wall of the sleeve (31), the driven gear (34) being meshed with the driving gear (41).

4. The raw material dispersing device according to claim 1, characterized in that: A strip-shaped slot is provided on the top wall of the funnel-shaped cavity (21), the baffle plate (60) is inserted into the strip-shaped slot, and an elastic clamping mechanism is provided on the side of the strip-shaped slot. The elastic clamping mechanism is configured to be able to apply an elastic clamping force to the upper end of the baffle plate (60) and to be able to be removed from the upper end of the baffle plate (60).

5. The raw material dispersing device according to claim 4, characterized in that: The elastic clamping mechanism comprises a guide column (70), a pressure block (71), an elastic element (72) and a nut (73); the guide column (70) is fixedly arranged on the top wall of the funnel-shaped cavity (21); the pressure block (71) is slidably connected to the guide column (70) and can rotate relative to the guide column (70); an external thread is provided at the upper end of the guide column (70); the nut (73) is connected to the external thread; the elastic element (72) is arranged between the nut (73) and the pressure block (71); a cantilever is provided on the pressure block (71); when the pressure block (71) rotates relative to the guide column (70), the cantilever can be moved to the top of the material baffle plate (60) or removed from the top of the material baffle plate (60).

6. The raw material dispersing device according to claim 5, characterized in that: The bottom of the cantilever is provided with a groove matching the shape of the top surface of the material blocking plate (60).

7. The raw material dispersing device according to claim 1, characterized in that: In the preset rotation direction, from the first baffle plate (61) to the Kth baffle plate (62), the difference in distance between the second end of the bottom edge of each adjacent baffle plate (60) and the center of the annular turntable (30) gradually increases.

8. The raw material dispersing device according to claim 1, characterized in that: The lower end opening of the feed pipe (50) is fan-shaped.

9. The raw material dispersing device according to claim 1, characterized in that: A material dividing plate (22) is provided on the conical side wall of the funnel-shaped cavity (21), and the material dividing plate (22) has an inverted V-shaped side wall that is narrow at the top and wide at the bottom. A plurality of the material dividing plates (22) are arranged at intervals along the circumference of the funnel-shaped cavity (21), and the upper end of each of the material dividing plates (22) corresponds one-to-one to the first end of each of the material blocking plates (60).

10. A raw meal preheating process, using the raw meal dispersing device according to any one of claims 1 to 9, characterized in that: The steps include: The raw material dispersing device is connected in series to the preheater pipeline via the first connecting pipe (10) and the second connecting pipe (20); The raw meal is fed into the preheater pipeline through the raw meal dispersing device.

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