Double-layer distribution box for suspension preheater

Abstract

The application discloses a double-layer material distribution box for a suspension preheater, which comprises a riser, a material distribution box fixedly arranged on the side wall of the riser and inclined downward, and a feeding port arranged on the top of the material distribution box, wherein the top of the material distribution box is in communication with the feeding port, the bottom of the material distribution box is in communication with the inside of the riser, a distribution plate is fixedly arranged on the left and right inner walls of the cavity between the upper and lower side walls of the cavity, the distribution plate divides the inside cavity of the material distribution box into a first material conveying channel and a second material conveying channel, a first material distribution plate is arranged in connection with the bottom end of the distribution plate between the left and right inner walls of the material distribution box, and the bottom end of the first material distribution plate extends into the inside of the riser and is arranged in an inclined manner downward. The application can improve the material dispersion effect, thereby improving the material heat exchange efficiency, and is convenient for adjusting the angle of the material distribution plate and replacing the parts, and can prolong the overall service life of the material distribution box.

Description

Technical Field

[0001] This invention relates to the field of suspension preheater technology, and in particular to a double-layer feeding box for suspension preheaters. Background Technology

[0002] In the new dry-process cement clinker production technology, the suspension preheater plays a crucial role in gas-solid heat exchange and separation. 80% of the gas-solid heat exchange is completed in the rising pipe, and the time required for heat exchange between the hot gas flow and the material is very short. Improving heat exchange efficiency plays a significant role in energy conservation and emission reduction in the calcination system. The suspension preheater uses a material distribution box to disperse clumps or strands of material from the previous stage cyclone separator, ensuring full contact with high-temperature flue gas in the rising pipe for efficient gas-solid heat exchange. The dispersion effect of the material in the rising pipe directly affects the heat exchange efficiency of the suspension preheater.

[0003] like Figure 1 As shown, in existing suspension preheaters, the primary feeding box 100 often uses a simple cylindrical channel, welded to the side wall of the primary riser pipe 101. The top of the primary riser pipe 101 is bent to a horizontal position, and its outlet is welded to the side wall of the primary cyclone separator 103. The bottom end of the primary cyclone separator 103 is connected to a primary discharge pipe 105 (on which an airlock valve 104 is installed), forming a primary preset unit. Figure 1Taking the two-stage preset structure shown as an example, the material's path is indicated by the solid arrow in the figure as "a1-b1-c1-d1-e1", and the high-temperature airflow's path is indicated by the hollow arrow in the figure as "a2-b2-c2-d2-e2". The material is fed in through the primary feeding box 100 and evenly dispersed in the primary riser pipe 101. The high-temperature airflow is fed in through the secondary riser pipe 108 at the bottom, rises through the secondary cyclone separator 107 located below the primary riser pipe 101, and enters the primary riser pipe 101. The material evenly dispersed in the primary riser pipe 101 is in a suspended state and exchanges heat with the rising high-temperature airflow, then rises with the airflow into the primary cyclone separator 103. The material rotates and slides down the inner wall of the primary cyclone separator 103. When most of the rotating airflow reaches the bottom cone position of the primary cyclone separator 103, the high-temperature airflow flows along the primary cyclone separator 103... The inner cylinder 102 in the central area rises and discharges, separating the material from the high-temperature airflow under the action of centrifugal force and gravity. The separated material then enters the secondary feeding box 106 through the primary discharge pipe 105, and is subsequently fed into the secondary riser pipe 108. Within the secondary riser pipe 108, the material is again in a dispersed, suspended state and undergoes secondary heat exchange with the high-temperature airflow. It then rises again into the secondary cyclone separator 107, where it is separated from the high-temperature airflow once more. The separated and fully preheated material is then discharged through the secondary discharge pipe at the bottom of the secondary cyclone separator 107. By connecting multiple preheating units in series, a multi-stage pre-heating system (currently up to 5 to 6 stages) can be constructed. This multi-stage preheating process enables rapid heat exchange and heating of the material, automatic gas-solid separation, and high utilization of the high-temperature airflow's thermal energy.

[0004] However, prolonged use of the feeding box can lead to wear and deformation of the feeding plates, causing the material to often form a jet and rush into the riser pipe, resulting in unsatisfactory feeding effect. The feeding box loses its intended feeding function, reducing the heat exchange efficiency of the material within the riser pipe. Furthermore, a worn and deformed feeding box can also cause problems with material falling smoothly, adversely affecting heat exchange within the riser pipe. In addition, a damaged feeding box can easily cause material collapse and short circuits in the preheater, or failure to repair or replace it in a timely manner can lead to high outlet temperature and large pressure loss in the preheater system. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a double-layer material spreading box for a suspension preheater to improve the material dispersion effect, thereby improving the material heat exchange efficiency, while facilitating the adjustment of the spreading plate angle and the replacement of components, so as to extend the overall service life of the spreading box.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A double-layer feeding box for a suspension preheater includes a riser pipe, a feeding box fixedly disposed on the side wall of the riser pipe and inclined downward, and a feed inlet disposed on the top of the feeding box. The top of the feeding box communicates with the feed inlet, and the bottom of the feeding box communicates with the interior of the riser pipe. Dividing plates are fixedly disposed on the left and right inner walls of the feeding box cavity, located between the upper and lower side walls of the cavity. The dividing plates divide the interior cavity of the feeding box into a first feeding channel and a second feeding channel. The bottom end of the dividing plates is connected to a first feeding plate located between the left and right inner walls of the feeding box. The bottom end of the first feeding plate extends into the interior of the riser pipe and is inclined downward.

[0008] Furthermore, the top of the first spreading plate is located below the bottom of the dividing plate and is rotatably connected to the inner walls of the left and right sides of the spreading box via a first shaft. A first connecting rod is hinged to the top surface of the first spreading plate, and a ball joint is hinged to the top of the first connecting rod. An adjusting screw threaded to the top of the ball joint is rotatably connected to the top of the spreading box.

[0009] Furthermore, a threaded connecting block is movably embedded in the top of the material dispensing box, and the threaded connecting block is threadedly sleeved on the outside of the adjusting screw.

[0010] Furthermore, a V-shaped cross-section first diverter plate is fixedly installed at the lower part of the first connecting rod. The two side walls of the first diverter plate are located on both sides of the outlet end of the first conveying channel, and the top side faces the inlet end of the first conveying channel.

[0011] Furthermore, a second material spreading plate is provided above the inner side of the bottom wall of the spreading box, located at the outlet end of the second material conveying channel. The top of the second material spreading plate is rotatably connected between the left and right inner walls of the spreading box via a second shaft. A second connecting rod is hinged to the top surface of the second material spreading plate, and the top of the second connecting rod is hinged to the bottom surface of the first material spreading plate.

[0012] Furthermore, a second diverter plate with a V-shaped cross-section is fixedly installed at the lower part of the second connecting rod. The two side walls of the second diverter plate are located on both sides of the outlet end of the second conveying channel, and the top side faces the inlet end of the second conveying channel.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. This invention divides the internal cavity of the material dispensing box into two independent conveying channels by setting a dividing plate in the dispensing box, so that the material can fall into the riser pipe in two streams. This can effectively reduce the wind speed in the riser pipe, reduce the system resistance, and reduce the amount of single impact wear on the dispensing plate, thereby improving the material dispersion effect and improving the material heat exchange efficiency.

[0015] 2. This invention, by setting an adjustable double-layer spreading plate, can effectively adjust the falling speed of materials to adapt to the preheating process requirements of materials with different particle sizes. It has good versatility, and the angle adjustment of the spreading plate is simple and convenient. Moreover, the spreading plate and other components are replaceable, thus improving the overall service life of the spreading box and reducing the cost of use and maintenance. Attached Figure Description

[0016] Figure 1 A simplified schematic diagram of the structure of a suspension preheater in the prior art;

[0017] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 4 This is one of the three-dimensional structural schematic diagrams of the present invention with the riser tube state omitted;

[0020] Figure 5 This is the second three-dimensional structural schematic diagram of the present invention, omitting the state of the rising pipe;

[0021] Figure 6 This is a cross-sectional structural diagram of the present invention with the riser tube omitted.

[0022] Figure 7 This is one of the three-dimensional structural schematic diagrams of the material spreading box;

[0023] Figure 8 This is the second three-dimensional structural schematic diagram of the material spreading box;

[0024] Figure 9 This is a schematic cross-sectional view of the material spreading box;

[0025] Figure 10 This is a three-dimensional structural diagram of the first connecting rod and the first diverter plate;

[0026] Figure 11 This is one of the three-dimensional structural schematic diagrams of the threaded connecting block;

[0027] Figure 12 This is the second three-dimensional structural schematic diagram of the threaded connection block.

[0028] In the diagram: 1. Divider plate, 2. First conveying channel, 3. Second conveying channel, 4. First spreading plate, 5. Inlet, 6. Spreading box, 601. Connecting flange, 602. Side plate mounting hole, 603. Insertion slot, 7. Ascending pipe, 8. First connecting rod, 801. First diverter plate, 9. Ball joint, 10. Adjusting screw, 11. Threaded connecting block, 111. Insertion block, 12. Second spreading plate, 13. Second connecting rod, 14. Side cover plate, 131. Second diverter plate, 100. Primary spreading box, 103. Primary cyclone, 104. Airlock valve, 105. Primary discharge pipe, 106. Secondary spreading box, 107. Secondary cyclone, 108. Secondary ascending pipe. Detailed Implementation

[0029] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0030] Please see Figures 2 to 12 A double-layer feeding box for a suspension preheater includes a riser pipe 7, a feeding box 6 fixedly disposed on the side wall of the riser pipe 7 and inclined downward, and a feed inlet 5 disposed on the top of the feeding box 6. The top of the feeding box 6 is connected to the feed inlet 5, and the bottom of the feeding box 6 is connected to the interior of the riser pipe 7. The feed inlet 5, the feeding box 6, and the riser pipe 7 constitute a material heating structure similar to that of existing suspension preheaters. That is, the material to be preheated is fed into the feeding box 6 through the feed inlet 5, and then slides down into the riser pipe 7 through the feeding box 6. The high-temperature flue gas (such as...) in the riser pipe 7... Figure 2 (As indicated by the middle arrow) It exchanges heat with the material to preheat the material.

[0031] like Figure 6 and Figure 7 As shown, the rear outer side of the material spreading box 6 is welded with an arc-shaped connecting flange 601 that matches the outer wall of the riser pipe 7. The connecting flange 601 is fixedly connected to the outer wall of the riser pipe 7 by multiple bolts. The bolt connection method facilitates the installation and removal of the material spreading box 6 on the riser pipe 7, so as to clean the inside of the material spreading box 6 or to inspect and replace the inner wall and internal structural components of the material spreading box 6.

[0032] like Figure 3 , Figure 5 , Figure 7 and Figure 9As shown, a dividing plate 1 is fixedly installed on the left and right inner walls of the material spreading box 6, located between the upper and lower side walls of the cavity. The dividing plate 1 divides the internal cavity of the material spreading box 6 into a first material conveying channel 2 and a second material conveying channel 3. A first material spreading plate 4 is connected to the bottom end of the dividing plate 1, located between the left and right inner walls of the material spreading box 6. The bottom end of the first material spreading plate 4 extends into the interior of the riser pipe 7 and is inclined downward. In this embodiment, the dividing plate 1 is welded and fixed to the left and right inner walls of the material spreading box 6 and is located in the middle of the cavity of the material spreading box 6, dividing the cavity of the material spreading box 6 into two independent channels with the same inlet cross-sectional area. When the material enters the feed end of the spreading box 6 through the feed inlet 5, it is divided into upper and lower layers by the action of the dividing plate 1 and enters the first conveying channel 2 and the second conveying channel 3 respectively. The material in the first conveying channel 2 continues to slide down along the first spreading plate 4 into the riser pipe 7, and the material in the second conveying channel 3 continues to fall down along the bottom side wall of the spreading box 6 into the riser pipe 7. Thus, a single material can be divided into upper and lower streams to enter the riser pipe 7, thereby increasing the contact area between the material and the high-temperature flue gas in the riser pipe 7, thereby improving the material dispersion effect and heat exchange efficiency, while reducing the impact and wear of a single material on the spreading plate.

[0033] To facilitate the replacement and tilt angle adjustment of the first spreading plate 4, in another embodiment, the first spreading plate 4 is detachably and rotatably installed within the spreading box 6. Specifically, as shown... Figure 5 and Figure 6 As shown, the top of the first spreading plate 4 is located below the bottom of the dividing plate 1, and is rotatably connected to the inner walls of the left and right sides of the spreading box 6 via a first shaft. A first connecting rod 8 is hinged to the top surface of the first spreading plate 4, and a ball joint 9 is hinged to the top of the first connecting rod 8. An adjusting screw 10, threadedly connected to the top of the ball joint 9, is rotatably connected to the top of the spreading box 6. Thus, by rotating the adjusting screw 10, its vertical positioning on the spreading box 6 can be adjusted, thereby changing the vertical height of the ball joint 9 at the bottom of the adjusting screw 10. This, in turn, causes the first spreading plate 4 to swing up and down around the first shaft via the first connecting rod 8, thereby adjusting the tilt angle and changing the falling speed of the material in the first conveying channel 2 to adapt to the preheating process requirements of materials with different particle sizes. The bottom of the adjusting screw 10 and the top of the ball joint 9 are connected by a ball joint, which can simultaneously satisfy the rotation of the adjusting screw 10 and the vertical lifting of the ball joint 9.

[0034] Preferably, in another embodiment, a threaded connecting block 11 is movably embedded in the top of the material dispensing box 6, and the threaded connecting block 11 is threadedly sleeved on the outside of the adjusting screw 10. Specifically, as shown... Figure 11 and Figure 12As shown, the threaded connecting block 11 has a cylindrical structure with an internally threaded through hole coaxially arranged inside. The external threaded section of the adjusting screw 10 is threadedly connected to the threaded connecting block 11, and the smooth part of the adjusting rod 10 is movably inserted into the top side wall of the spreading box 6. Multiple insertion blocks 111 are integrally provided on the bottom surface of the threaded connecting block 11, and insertion slots 603 that mate with the insertion blocks 111 are opened on the top surface of the spreading box 6. Through the insertion and engagement of the insertion blocks 111 and the insertion slots 603, the threaded connecting block 11 can be fixedly connected to the spreading box 6, thereby changing the tilt angle of the first spreading plate 4 by rotating the adjusting screw 10. When material falls poorly or adheres to the first spreading plate 4, the threaded connecting block 11 can be pulled out of the spreading box 6, and the adjusting screw 10 can be pulled up and down repeatedly at a high frequency and large amplitude. This can temporarily increase the swing amplitude and frequency of the first spreading plate 4, causing the material to detach from the first spreading plate 4. After the operation is completed, the threaded connecting block 11 can be reconnected to the spreading box 6 for fixation. Preferably, the top of the adjusting screw 10 is integrally provided with a pull ring, which facilitates the rotation and up and down pulling operation of the adjusting screw 10.

[0035] In another embodiment, a V-shaped cross-section first diverter plate 801 is fixedly disposed at the lower part of the first connecting rod 8 (e.g., Figure 10 As shown, the two side walls of the first diverting plate 801 are located on both sides of the outlet end of the first conveying channel 2, with the tip facing the inlet end of the first conveying channel 2. In this way, as the material in the first conveying channel 2 slides down, it is further divided into two horizontally parallel streams under the action of the first diverting plate 801, thereby further improving the dispersion effect of the material.

[0036] In another embodiment, to make the bottom material sliding surface of the second conveying channel 3 replaceable, a second spreading plate 12 is provided above the inner side of the bottom wall of the spreading box 6, located at the outlet end of the second conveying channel 3. Thus, when the surface of the second spreading plate 12 is worn due to long-term material impact, the second spreading plate 12 can be replaced in the same way as the first spreading plate 4, ensuring the normal operation of the spreading box as a whole. Preferably, to make the tilt angle of the second spreading plate 12 adjustable to change the material falling speed in the second conveying channel 3, in this embodiment, the top end of the second spreading plate 12 is rotatably connected between the left and right inner walls of the spreading box 6 via a second shaft, and a second connecting rod 13 is hinged to the top surface of the second spreading plate 12, the top end of the second connecting rod 13 being hinged to the bottom surface of the first spreading plate 4. Thus, when the adjusting screw 10 changes the tilt angle of the first spreading plate 4, the first spreading plate 4 pulls the second spreading plate 12 to swing synchronously in the same direction via the second connecting rod 13, thereby adjusting the tilt angle of the two spreading plates. Preferably, the first spreading plate 4 and the second spreading plate 12 are arranged parallel to each other, and the second connecting rod 13 is arranged parallel to the line connecting the rotation axes of the two spreading plates, so that the two spreading plates and the second connecting rod 13 form a parallelogram linkage mechanism, which can keep the tilt angle of the two spreading plates the same at all times.

[0037] Similarly, in another embodiment, a V-shaped cross-section second diverter plate 131 is fixedly disposed at the lower part of the second connecting rod 13. The two side walls of the second diverter plate 131 are located on both sides of the outlet end of the second conveying channel 3, with the tip facing the inlet end of the second conveying channel 3. The structure of the second connecting rod 13 and the second diverter plate 131 is similar to that of the first connecting rod 8 and the first diverter plate 801. Thus, as the material in the second conveying channel 3 slides downward, it is further divided into two horizontally parallel streams under the action of the second diverter plate 131, thereby further improving the dispersion effect of the material.

[0038] To facilitate cleaning or replacement of internal structural components of the material dispensing box 6 without disassembly, such as... Figure 7 and Figure 8 As shown, a side plate mounting hole 602 is provided on the side wall of the material spreading box 6. A side cover plate 14 is embedded in the side plate mounting hole 602. The inner surface of the side cover plate 14 is in the same plane as the inner wall of the material spreading box 6 to ensure the smooth flow of material. Figure 2 and Figure 4 As shown, the edge of the side cover plate 14 is fixed to the outer wall of the material distribution box 6 by bolts, so that the side wall of the material distribution box 6 remains continuous and closed. The side cover plate 14 can be temporarily removed to allow for internal inspection, cleaning and component replacement through the side plate mounting holes 602.

[0039] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A double-layer feeding box for a suspension preheater, comprising a riser pipe (7), a feeding box (6) fixedly disposed on the side wall of the riser pipe (7) and inclined downward, and a feed inlet (5) disposed on the top of the feeding box (6), wherein the top of the feeding box (6) is in communication with the feed inlet (5), and the bottom of the feeding box (6) is in communication with the interior of the riser pipe (7), characterized in that: The material dispensing box (6) has a dividing plate (1) fixedly installed on the inner walls of the left and right sides of the cavity, which is located between the upper and lower side walls of the cavity. The dividing plate (1) divides the internal cavity of the material dispensing box (6) into a first material conveying channel (2) and a second material conveying channel (3). The bottom end of the dividing plate (1) is connected to a first material dispensing plate (4) located between the inner walls of the left and right sides of the material dispensing box (6). The bottom end of the first material dispensing plate (4) extends into the interior of the riser pipe (7) and is inclined downward.

2. The double-layer feeding box for a suspension preheater according to claim 1, characterized in that: The top of the first spreading plate (4) is located below the bottom of the dividing plate (1) and is rotatably connected to the inner walls of the left and right sides of the spreading box (6) via the first shaft. The top surface of the first spreading plate (4) is hinged with a first connecting rod (8), and the top of the first connecting rod (8) is hinged with a ball joint (9). The top of the ball joint (9) is rotatably connected with an adjusting screw (10) threaded to the top of the spreading box (6).

3. A double-layer feeding box for a suspension preheater according to claim 2, characterized in that: The top of the material spreading box (6) is movably fitted with a threaded connecting block (11), which is threadedly sleeved on the outside of the adjusting screw (10).

4. A double-layer feeding box for a suspension preheater according to claim 2 or 3, characterized in that: The lower part of the first connecting rod (8) is fixedly provided with a first diverter plate (801) with a V-shaped cross section. The two side walls of the first diverter plate (801) are located on both sides of the outlet end of the first conveying channel (2) and the top side faces the inlet end of the first conveying channel (2).

5. A double-layer feeding box for a suspension preheater according to claim 2 or 3, characterized in that: The bottom wall of the material spreading box (6) is provided with a second material spreading plate (12) located at the outlet end of the second material conveying channel (3). The top of the second material spreading plate (12) is rotatably connected between the left and right inner walls of the material spreading box (6) through a second shaft. A second connecting rod (13) is hinged on the top surface of the second material spreading plate (12). The top of the second connecting rod (13) is hinged to the bottom surface of the first material spreading plate (4).

6. A double-layer feeding box for a suspension preheater according to claim 5, characterized in that: The lower part of the second connecting rod (13) is fixedly provided with a second diverter plate (131) with a V-shaped cross section. The two side walls of the second diverter plate (131) are located on both sides of the outlet end of the second conveying channel (3) and the top side faces the inlet end of the second conveying channel (3).

Images