A cement kiln tail classification combustion device

Abstract

The application relates to the technical field of tail gas treatment, and discloses a cement kiln tail grading combustion device, which comprises a grading combustion furnace and a purification mechanism for treating tail gas pumped out of the grading combustion furnace, the purification mechanism comprises a tank body, one end of the tank body is provided with an air inlet pipe, a first baffle and a second baffle are fixed in the tank body along the axial direction, the first baffle and the second baffle divide the tank body into an intercepting chamber, a gas exchange chamber and a purification chamber in sequence along the air inlet direction; in the application, a commutation assembly continuously switches the flow paths of the tail gas in the rotating process, so that the tail gas can flow through the fillers in the bin from inside to outside through the outer cylinder and then be discharged, or flow through the fillers in the bin from outside to inside through the commutation disc and then be discharged through the exhaust pipe, and the design of the inside-outside flow alternation can improve the efficient utilization of the activated carbon adsorption material.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas treatment technology, specifically to a staged combustion device for the tail end of a cement kiln. Background Technology

[0002] The staged combustion process in cement kilns generates a large amount of harmful gases, which can easily pollute the living environment. Therefore, it is necessary to treat the exhaust gases produced during combustion. A search revealed that CN217031983U discloses a staged combustion device for cement kiln tail in cement production, comprising a filtration mechanism, a disassembly and assembly mechanism, an activated carbon adsorption plate, and a staged combustion furnace. The disassembly and assembly mechanism is mounted on the filtration mechanism, as are the staged combustion furnace and the activated carbon adsorption plate. The filtration mechanism includes a support plate, a fixed box fixedly connected to the top of the support plate, a suction pump fixedly connected to the left side of the fixed box, a suction pipe fixedly connected to the outlet of the suction pump, an exhaust hood fixedly connected to the bottom end of the suction pipe, a first intake pipe fixedly connected to the inlet of the suction pump, a second intake pipe fixedly connected to the outside of the first intake pipe, and a third intake pipe fixedly connected to the outside of the first intake pipe.

[0003] The above-mentioned graded combustion device at the kiln tail of the cement kiln still has the following problems: The above-mentioned graded combustion device at the kiln tail of the cement kiln filters the exhaust gas through a filter screen and then purifies it through an activated carbon adsorption plate. Since the exhaust gas intake direction and path are relatively fixed, the adsorption utilization rate of the activated carbon adsorption plate on the side closer to the intake direction is greater than that on the other side, which requires frequent maintenance and replacement, resulting in reduced utilization efficiency. Summary of the Invention

[0004] This invention proposes a staged combustion device for the tail of a cement kiln, which solves the problem that the direction and path of the exhaust gas in the prior art are relatively fixed.

[0005] The technical solution of the present invention is as follows: A graded combustion device for the tail of a cement kiln includes a graded combustion furnace and a purification mechanism for treating the exhaust gas pumped out of the graded combustion furnace. The purification mechanism includes a tank body, one end of which is provided with an air inlet pipe. A first partition and a second partition are fixed along the axial direction inside the tank body. The first partition and the second partition divide the tank body into an interception chamber, an air exchange chamber and a purification chamber in sequence along the air inlet direction. The purification chamber is equipped with a hopper filled with activated adsorption packing material. An outer cylinder runs through the hopper and extends into the ventilation chamber. A converter plate is provided on the outside of the outer cylinder. An elastic pressure member capable of flexibly sealing the air inlet pipe is provided in the interception chamber. A converter assembly is provided on the first partition plate that rotates under the air pressure at the air inlet pipe during operation. An exhaust pipe is provided inside the outer cylinder. During the rotation of the converter assembly, the flow path of the exhaust gas is continuously switched, so that the exhaust gas can flow from the inside to the outside through the outer cylinder, through the packing material in the hopper, and then be discharged, or flow from the outside to the inside through the converter plate, through the packing material in the hopper, and then be discharged through the exhaust pipe.

[0006] Preferably, the elastic pressure member includes a conical pressure cap, with a telescopic rod fixed along its axial direction on the inner side of the conical pressure cap, and a spring provided on the outer side of the telescopic rod to elastically connect the conical pressure cap to the converter assembly.

[0007] Preferably, the converter assembly includes a duct, which is rotatably connected to the first partition. The telescopic rod is slidably engaged with the duct. A rotating ring is coaxially fixed to the duct via a bracket. Several annular arrays of inclined blades are fixed to the outer surface of the rotating ring. Several equidistantly distributed fan-shaped blocks are fixed to the outer side of one end of the duct inside the converter plate. Air distribution holes are opened between adjacent fan-shaped blocks in the duct. A through groove is opened at the location of the duct outside the converter plate.

[0008] Preferably, the first partition is provided with an interception net that is distributed in a ring around the converter assembly, and a wind guide hood is fixed on one side of the first partition located in the air exchange chamber. The end of the wind guide hood away from the interception net gradually closes towards the converter disk.

[0009] Preferably, the surface of the silo is provided with a plurality of external guide holes, and a plurality of first vent pipes are provided outside the silo to connect the inner cavity of the silo with the outer body of the tank. The external guide holes and the first vent pipes are alternately arranged along the axial direction of the silo. A plurality of first grids and second grids are provided inside the silo, and the first grids and second grids are alternately arranged along the axial direction of the silo. The first grids are fixed to the inner wall of the silo and maintain a certain distance from the outer wall of the outer cylinder. The second grids are fixed to the outer wall of the outer cylinder and maintain a certain distance from the inner wall of the silo.

[0010] Preferably, the exhaust pipe includes an exhaust pipe, one end of which is closed inside the outer cylinder, and the other end of which extends to the outside of the tank. A second exhaust conduit communicating with the inner cavity of the silo is provided at the location of the exhaust pipe inside the outer cylinder.

[0011] Preferably, the second air outlet duct is arranged opposite to the outer guide hole.

[0012] Preferably, the outer cylinder has an inner guide hole that communicates with the inner cavity of the hopper, and the inner guide hole is positioned opposite to the first air outlet duct.

[0013] Preferably, the converter plate has an independent outer ring cavity and an inner ring cavity. The outer ring cavity is connected to the purification chamber outside the silo. The converter plate has an air inlet duct that penetrates the inner ring cavity and communicates with the outer ring cavity, as well as a through hole that communicates with the inner ring cavity. The through hole and the air inlet duct are alternately arranged along the axial vertical section of the converter plate.

[0014] The beneficial effects of this invention are as follows: In this invention, the converter component continuously switches the flow path of the exhaust gas during rotation, so that the exhaust gas can flow from the inside to the outside through the outer cylinder, pass through the packing in the hopper, and then be discharged, or flow from the outside to the inside through the converter plate, pass through the packing in the hopper, and then be discharged through the exhaust pipe. This alternating design of internal and external flow can improve the efficient utilization of activated carbon adsorption materials. The present invention provides an interception net that is arranged in a ring around the converter assembly on the first baffle. The airflow is dispersed to the location of the interception net by the guiding effect of the conical pressure cap, thereby improving the utilization rate of the interception net and thus achieving full interception of solid impurities in the airflow. This invention provides an elastic pressure component in the interception chamber that can flexibly seal the air intake pipe. Under wind pressure, the opening and closing state of the air intake pipe can be automatically adjusted to ensure stable airflow. At the same time, the air intake pipe is sealed when the machine is stopped to prevent flue gas backflow. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a half-section structural diagram of a graded combustion device at the tail of a cement kiln proposed in this invention. Figure 2 This is a schematic cross-sectional view of a graded combustion device at the tail of a cement kiln proposed in this invention. Figure 3 This is a schematic diagram of the elastic pressure member and converter assembly structure proposed in this invention; Figure 4 This is a schematic diagram of the elastic pressure member and converter assembly proposed in this invention from another perspective; Figure 5 This is a schematic diagram of a half-section of the elastic pressure member and converter assembly proposed in this invention; Figure 6 for Figure 2 Schematic diagram of the cross-sectional structure at point AA; In the diagram: 1. Tank body; 2. Inlet pipe; 3. First baffle; 31. Interception net; 4. Second baffle; 5. Air guide hood; 6. Elastic pressure component; 61. Conical pressure cap; 62. Telescopic rod; 63. Spring; 7. Converter assembly; 71. Air duct; 72. Support; 73. Rotating ring; 74. Blade; 75. Through slot; 76. Fan-shaped plug; 77. Air distribution hole; 8. Hopper; 81. Outer guide hole; 82. First outlet duct; 83. First grid; 84. Second grid; 9. Outer cylinder; 91. Inner guide hole; 10. Converter plate; 101. Outer annular cavity; 102. Inner annular cavity; 103. Inlet duct; 104. Through hole; 11. Exhaust pipe fitting; 111. Exhaust pipe; 112. Second outlet duct. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1 and Figure 2 The present invention provides a technical solution: a graded combustion device for the tail of a cement kiln, comprising a graded combustion furnace and a purification mechanism for treating the exhaust gas pumped out of the graded combustion furnace. The purification mechanism includes a tank 1, with an air inlet pipe 2 at one end of the tank 1. A first partition 3 and a second partition 4 are fixed inside the tank 1 along its axial direction. The first partition 3 and the second partition 4 divide the inside of the tank 1 to form an interception chamber, an air exchange chamber, and a purification chamber in sequence along the air inlet direction. The multi-chamber structure design helps to gradually treat the exhaust gas and improve the purification effect.

[0019] Furthermore, the purification chamber is equipped with a hopper 8 filled with activated adsorption packing material. An outer cylinder 9 runs through the hopper 8 and extends into the ventilation chamber. An exchange plate 10 is provided on the outside of the outer cylinder 9. An elastic pressure member 6 is provided in the interception chamber, which can flexibly seal the air inlet pipe 2. It can automatically adjust the opening and closing state of the air inlet pipe under the action of wind pressure to ensure stable airflow. At the same time, it closes the air inlet pipe 2 when the machine is stopped to prevent flue gas backflow. An exchange component 7 is provided on the first partition 3, which rotates under the action of wind pressure at the air inlet of the air inlet pipe 2 during operation. An exhaust pipe 11 is provided in the outer cylinder 9. During the rotation of the exchange component 7, the flow path of the exhaust gas is constantly switched, so that the exhaust gas can flow from the inside to the outside through the outer cylinder 9, pass through the packing material in the hopper 8 and be discharged, or flow from the outside to the inside through the exchange plate 10, pass through the packing material in the hopper 8 and be discharged through the exhaust pipe 11.

[0020] Please see Figure 3 , Figure 4 and Figure 5The elastic pressure member 6 includes a conical pressure cap 61, with a telescopic rod 62 fixed on the inner side of the conical pressure cap 61 along its axial direction, and a spring 63 provided on the outer side of the telescopic rod 62 to elastically connect the conical pressure cap 61 and the converter assembly 7.

[0021] Furthermore, the converter assembly 7 includes a duct 71, which is rotatably connected to the first partition 3. The telescopic rod 62 can slide with the duct 71. The duct 71 is coaxially fixed with a rotating ring 73 via a bracket 72. Several annular arrays of inclined blades 74 are fixed on the outer surface of the rotating ring 73. Several fan-shaped blocks 76 distributed at equal angles are fixed on the outer side of one end of the duct 71 inside the converter disk 10. Air distribution holes 77 are opened between adjacent fan-shaped blocks 76 in the duct 71. A through groove 75 is opened at the part of the duct 71 outside the converter disk 10.

[0022] Please see Figure 1 and Figure 2 The first partition 3 is provided with an interception net 31 that is distributed in a ring around the converter assembly 7 to intercept solid impurities in the airflow. The first partition 3 is fixed with a wind guide hood 5 on one side of the air exchange chamber. The end of the wind guide hood 5 away from the interception net 31 gradually closes towards the converter disk 10. The airflow that has been initially filtered is guided to the converter disk 10 through the through slot 75 by the wind guide hood 5.

[0023] Please see Figure 2 The surface of the hopper 8 has several external guide holes 81, and several first air outlet pipes 82 are provided outside the hopper 8 to connect the inner cavity of the hopper 8 to the outside of the tank body 1. The external guide holes 81 and the first air outlet pipes 82 are alternately arranged along the axial direction of the hopper 8. This design helps to achieve uniform airflow distribution and efficient purification. Several first grids 83 and second grids 84 are provided inside the hopper 8, and the first grids 83 and second grids 84 are alternately arranged along the axial direction of the hopper 8. The first grids 83 are fixed to the inner wall of the hopper 8 and maintain a certain distance from the outer wall of the outer cylinder 9. The second grids 84 are fixed to the outer wall of the outer cylinder 9 and maintain a certain distance from the inner wall of the hopper 8. The grid structure can play a blocking role, ensuring that the airflow path can pass through the activated carbon material layer, thereby increasing the contact area between the airflow and the adsorption material and improving the purification effect.

[0024] Furthermore, the exhaust pipe 11 includes an exhaust pipe 111. One end of the exhaust pipe 111 is closed inside the outer cylinder 9, and the other end of the exhaust pipe 111 extends to the outside of the tank body 1. The part of the exhaust pipe 111 inside the outer cylinder 9 is provided with a second exhaust conduit 112 that communicates with the inner cavity of the hopper 8. The second exhaust conduit 112 is arranged opposite to the outer guide hole 81. The outer cylinder 9 is provided with an inner guide hole 91 that communicates with the inner cavity of the hopper 8. The inner guide hole 91 is arranged opposite to the first exhaust conduit 82.

[0025] Please see Figure 6The converter plate 10 has an independent outer ring cavity 101 and an inner ring cavity 102. The outer ring cavity 101 is connected to the purification chamber outside the hopper 8, and the inner ring cavity 102 is connected to the inner cavity of the outer cylinder 9. The converter plate 10 has an air inlet duct 103 that passes through the inner ring cavity 102 and communicates with the outer ring cavity 101, and a through hole 104 that communicates with the inner ring cavity 102. The through hole 104 and the air inlet duct 103 are alternately arranged along the axial vertical section of the converter plate 10. The dual-cavity design of the outer ring cavity 101 and the inner ring cavity 102 can realize flexible airflow distribution and efficient purification.

[0026] The working principle and usage process of this invention are as follows: The exhaust gas generated by the combustion of the staged combustion furnace is pumped to the air inlet pipe 2. The conical pressure cap 61 is subjected to pressure and compresses the telescopic rod 62, thereby allowing air to enter the tank 1. The conical pressure cap 61 guides the airflow to the blade 74, and under the action of wind pressure, the rotating ring 73 drives the air pipe 71, and the air pipe 71 drives the fan-shaped plug 76 to rotate continuously in the converter plate 10. like Figure 6 As shown, when the sector-shaped plug 76 rotates to block the air inlet duct 103, the airflow can enter the converter plate 10 through the air distribution hole 77, and enter the inner ring cavity 102 through the through hole 104, and then enter the outer cylinder 9. The airflow is then passed into the hopper 8 from the inside to the outside through the inner guide hole 91 on the outer cylinder 9. Due to the obstruction of the first grid 83 and the second grid 84, most of the airflow can be purified by the active adsorption material from the inside to the outside and discharged from the tank 1 through the first air outlet duct 82. When the sector-shaped plug 76 rotates to block the through hole 104, the airflow can enter the converter plate 10 through the air distribution hole 77, and then enter the outer ring cavity 101 through the air inlet duct 103, and then enter the purification chamber outside the silo 8. It enters the silo 8 from the outside to the inside through the outer guide hole 81. Due to the obstruction of the first grid 83 and the second grid 84, most of the airflow can pass through the purification of the activated adsorption material from the outside to the inside and enter the drain pipe 111 through the second air outlet duct 112, and then be discharged from the tank 1 through the drain pipe 111. Through the above process, the exhaust gas generated by the staged combustion furnace can pass through the activated carbon adsorption material layer in the silo 8 alternately from the inside to the outside, thereby maintaining the efficient utilization of the activated carbon adsorption material.

[0027] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cement kiln tail end staged combustion device comprising a staged combustion furnace, and a purification mechanism for treating exhaust gas pumped out of the staged combustion furnace, characterized in that, The purification mechanism includes a tank (1), one end of which is provided with an air inlet pipe (2). A first partition (3) and a second partition (4) are fixed inside the tank (1) along its axial direction. The first partition (3) and the second partition (4) divide the inside of the tank (1) to form an interception chamber, an air exchange chamber and a purification chamber in sequence along the air inlet direction. The purification chamber is provided with a hopper (8) filled with active adsorption packing material. Several first air outlet pipes (82) are provided outside the hopper (8) to connect the inner cavity of the hopper (8) with the outside of the tank (1). An outer cylinder (9) runs through the hopper (8). The outer cylinder (9) extends to the air exchange chamber and is provided with a converter plate (10) on the outside. An elastic pressure member (6) capable of elastically sealing the air inlet pipe (2) is provided in the interception chamber. The elastic pressure member (6) includes a conical pressure cap (61). A telescopic rod (62) is fixed on the inner side of the conical pressure cap (61) along its axial direction. A spring (63) elastically connects the conical pressure cap (61) and the converter assembly (7) on the outer side of the telescopic rod (62). The first partition (3) is provided with a converter assembly (7) that rotates under the air pressure of the air inlet pipe (2) during operation. The converter assembly (7) includes a duct (71) which is rotatably connected to the first partition (3). The telescopic rod (62) can slide with the duct (71). The duct (71) is coaxially fixed with a rotating ring (73) through a bracket (72). The outer surface of the rotating ring (73) is fixed with several ring arrays of inclined blades (74). The outer side of the duct (71) located inside the converter plate (10) is fixed with several fan-shaped plugs (76) distributed at equal angles. The duct (71) is provided with air distribution holes (77) between adjacent fan-shaped plugs (76). The duct (71) is provided with a through groove (75) located outside the converter plate (10). The first partition (3) is provided with an interception net (31) arranged in a ring around the converter assembly (7). The first partition (3) is fixed with a wind guide hood (5) on one side of the air exchange chamber. The end of the wind guide hood (5) away from the interception net (31) gradually closes towards the converter disk (10). The outer cylinder (9) is provided with an inner guide hole (91) that communicates with the inner cavity of the hopper (8), and the surface of the hopper (8) is provided with a number of outer guide holes (81). An exhaust pipe (11) is provided inside the outer cylinder (9). The flow exchange assembly (7) continuously switches the flow path of the exhaust gas during rotation, so that the exhaust gas can flow from the inside to the outside of the outer cylinder (9) through the packing in the hopper (8) and then be discharged, or flow from the outside to the inside of the flow exchange plate (10) through the packing in the hopper (8) and then be discharged through the exhaust pipe (11). The exhaust pipe (11) includes a drain pipe (111). One end of the drain pipe (111) is closed inside the outer cylinder (9), and the other end of the drain pipe (111) extends to the outside of the tank body (1). The drain pipe (111) is located at the position inside the outer cylinder (9). There is a second air outlet duct (112) that communicates with the inner cavity of the silo (8); the converter plate (10) is provided with an independent outer ring cavity (101) and an inner ring cavity (102). The outer ring cavity (101) communicates with the purification chamber outside the silo (8), and the inner ring cavity (102) communicates with the inner cavity of the outer cylinder (9). The converter plate (10) is provided with an air inlet duct (103) that penetrates the inner ring cavity (102) and communicates with the outer ring cavity (101) and a through hole (104) that communicates with the inner ring cavity (102). The through hole (104) and the air inlet duct (103) are alternately arranged along the axial vertical section of the converter plate (10).

2. The graded combustion device at the tail of a cement kiln according to claim 1, characterized in that, The outer guide hole (81) and the first air outlet duct (82) are alternately arranged along the axial direction of the hopper (8). The hopper (8) is provided with a plurality of first grids (83) and second grids (84), and the first grids (83) and second grids (84) are alternately arranged along the axial direction of the hopper (8). The first grids (83) are fixed on the inner wall of the hopper (8) and maintain a certain distance from the outer wall of the outer cylinder (9). The second grids (84) are fixed on the outer wall of the outer cylinder (9) and maintain a certain distance from the inner wall of the hopper (8).

3. The graded combustion device at the tail of a cement kiln according to claim 1, characterized in that, The second air outlet duct (112) is positioned opposite to the outer guide hole (81).

4. The cement kiln tail staged combustion device according to claim 1, characterized in that, The inner guide hole (91) is positioned opposite to the first air outlet duct (82).

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