Combustion system of an external furnace of a cement kiln

Abstract

This invention discloses a combustion system for an external furnace in a cement kiln, relating to the field of co-incineration technology for cement kilns. It has the advantage of changing the position of solid materials within the external furnace. The key technical points are: a furnace body and steps within the furnace body; the bottom and sides of the steps are equipped with injection mechanisms; a tertiary air duct is located above the furnace body; a solid material feed pipe is located on one side of the tertiary air duct above the furnace body; a first feed inlet communicating with the solid material feed pipe is opened on the side wall of the furnace body; a pusher is located on the side wall of the furnace body with the first feed inlet, below the first feed inlet; a movable pusher plate is slidably connected within a mounting box; when solid material enters the furnace body from the solid material feed pipe through the first feed inlet, the solid material falling towards the pusher plate is pushed by the reciprocating pusher plate, thereby changing the position of the solid material within the furnace body.

Description

Technical Field

[0001] This invention relates to the field of co-incineration technology of cement kilns, specifically a combustion system for an external furnace in a cement kiln. Background Technology

[0002] An external furnace is a device that is independent of, but closely connected to, the main system of a cement kiln. It is specifically designed for the efficient and clean disposal of various solid wastes (such as domestic waste, industrial waste, biomass, etc.) and converts them into combustible gases and ash, which are then completely utilized and disposed of within the cement kiln.

[0003] Currently, there is a stepped external furnace where materials enter the furnace from the external furnace through a spiral, chute, and two valve plates; tertiary air enters the furnace from directly above the pre-combustion furnace, and the hot air rotates and moves forward, preheating and drying the materials during contact; the tail outlet of the external furnace is connected to the cement kiln decomposition furnace, through which tertiary air and materials enter the decomposition furnace.

[0004] An air-jetting mechanism is installed on the bottom of the steps inside the external furnace. The air-jetting mechanism, powered by compressed air, sequentially jets the material according to the programmed settings, disturbing the material in the combustion zone, increasing the contact area between the material and oxygen, improving combustion conditions, and simultaneously creating a material tumbling effect, which gradually tumbles the material downwards and feeds it into the cement kiln decomposition furnace.

[0005] Chinese Patent Application No. 202410206522.0 discloses an oxygen-assisted combustion system and method for a stepped external furnace in a cement kiln, including a blowing mechanism installed on both the bottom and side surfaces of the stepped furnace steps. The blowing mechanism on the bottom surface can blow gas into the furnace from the bottom to disturb the material and allow it to be fully preheated and dried by tertiary air, and then gradually tumble down the steps. The blowing mechanism on the side surface can blow gas into the furnace from the side to adjust the combustion atmosphere inside the furnace, promote complete combustion of materials, and reduce losses from incomplete chemical combustion. The gas source connected to the blowing mechanism is an oxygen-enriched source, which can blow oxygen or oxygen-enriched air into the furnace to improve the combustion-assisted capacity of the blown gas.

[0006] However, the feeding mechanism of the above-mentioned prior art is set on the side of the external furnace away from the decomposition kiln, and the solid waste inlet is set on the side of the feeding mechanism away from the external furnace. The solid material enters the feeding mechanism through the solid waste inlet and is then transported to the uppermost step surface of the external furnace. At this time, the solid material will be fixed at the spill position of the external furnace, resulting in poor dispersion of the solid material and affecting subsequent combustion. Summary of the Invention

[0007] To address the aforementioned technical shortcomings, the purpose of this invention is to provide a combustion system for an external furnace in a cement kiln, which has the advantage of changing the position of solid materials spilling inside the external furnace.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] This invention provides a combustion system for an external furnace in a cement kiln, including a furnace body and a staircase installed inside the furnace body. The bottom and sides of the steps of the staircase are equipped with a jetting mechanism. The system also includes a tertiary air duct installed above the furnace body. A solid material feed pipe is installed on one side of the tertiary air duct above the furnace body. The solid material feed pipe communicates with the furnace body at a location on the side wall of the furnace body. A first feed inlet communicating with the solid material feed pipe is opened on the side wall of the furnace body. The first feed inlet is located at the top of the staircase.

[0010] The lower end of the furnace body is connected to the decomposition furnace. The furnace body has a pusher on the side wall with a first feed inlet. The pusher is located below the first feed inlet and includes an installation box installed on the outer wall of the furnace body. A movable pusher plate is slidably connected inside the installation box. When solid material enters the furnace body through the first feed inlet from the solid material feed pipe, the solid material falling towards the pusher plate is pushed by the reciprocating pusher plate, thereby changing the position of the solid material in the furnace body.

[0011] By adopting the above technical solution, the pusher is located below the first feed inlet, which facilitates the receipt of solid materials flowing out of the first feed inlet. The solid materials are pushed and dispersed by the reciprocating pusher plate, thereby changing the initial drop position of the solid materials at the top of the steps and keeping the material flow unobstructed, which is conducive to subsequent combustion and improves the dispersion of the solid materials. As the length and speed of the pusher plate change as it moves into the furnace body, the drop position of the solid materials pushed by the pusher plate can be further changed.

[0012] Preferably, when the push plate needs maintenance after a period of use, the mounting box is provided with a replacement plate to replace the push plate, and the mounting box is provided with an adjusting component to allow the replacement plate to be replaced with the push plate.

[0013] Preferably, the mounting box is a circular box with the opening facing upwards. The circular box has a notch on the side near the furnace body that fits against the outer wall of the furnace body. The mounting box is fixedly installed on the furnace body. The upper end of the mounting box is provided with a sealing plate to close the opening of the mounting box.

[0014] The adjusting component includes a turntable rotatably connected to the bottom of the mounting box, the turntable covering the bottom of the mounting box, a sliding groove on the upper surface of the turntable, the sliding groove being distributed along the diameter of the rotating shaft and extending through the outer wall of the turntable, the push plate and the replacement plate being slidably connected in the sliding groove, and a drive plate located between the push plate and the replacement plate being slidably connected in the sliding groove, the end of the drive plate that contacts the push plate and the replacement plate respectively being detachably connected by a connector;

[0015] An entry groove is provided on the side wall of the furnace body for the turntable to enter the furnace body. After the push plate, drive plate and replacement plate are connected as a whole, the opposite sides of the push plate and replacement plate extend to a position flush with the side wall of the turntable, and the opposite sides of the push plate and replacement plate are set as arc-shaped surfaces that cooperate with the outer wall of the turntable.

[0016] The mounting box is equipped with a driving component that drives the drive plate to move in the groove towards the groove. The lower outer wall of the mounting box is equipped with a power source that drives the turntable to rotate.

[0017] The adjusting component is also equipped with a pressure boosting component. When the adjusting component is working, the pressure boosting component increases the pressure on the side of the mounting box near the inlet groove.

[0018] Preferably, the outer wall of the furnace body is provided with an extension plate extending to the upper opening wall of the mounting box. The side of the extension plate away from the furnace body is provided with a partition extending into the mounting box and extending to the upper surface of the turntable. The turntable rotates below the partition. The extension plate is fixed to the upper opening of the mounting box. A pressurization space is formed between the extension plate, the partition, the inner wall of the mounting box and the outer wall of the furnace body. The pressurization component includes an air inlet pipe disposed on the extension plate.

[0019] Preferably, the driving component includes an electric cylinder disposed on the inner wall of the mounting box and located above the turntable, and the upper end face of the driving plate is rotatably provided with an upwardly extending connecting column, and the piston rod of the electric cylinder drives the connecting column to move;

[0020] The mounting box has extraction holes on its wall that are opposite to the entry slot and allow the push plate or replacement plate to pull out the mounting box. The outer wall of the mounting box is detachably equipped with a closure to seal the extraction holes.

[0021] Preferably, the inlet groove includes a first elongated groove for one end of the push plate or replacement plate to enter the furnace body and a second elongated groove for one end of the turntable at the lower end of the slide groove to enter the furnace body. The first elongated groove and the second elongated groove are connected and the length of the second elongated groove is less than the length of the first elongated groove. An arc surface is provided on the outer wall of the furnace body to cooperate with the first elongated groove and the second elongated groove. The arc surface allows the turntable and the push plate or replacement plate to slide into the second elongated groove or the first elongated groove, respectively.

[0022] Preferably, the connector includes two mounting slots on the drive plate, each facing the push plate and the replacement plate respectively. The vertical center line of the connecting column passes through the center line of the turntable. The push plate and the replacement plate are provided with mounting blocks extending into the two mounting slots respectively. The upper end face of the drive plate is threaded with a fastening screw that enters the mounting block. The sealing plate is provided with a disassembly hole corresponding to one of the fastening screws. The fastening screw fixes the push plate or replacement plate that is distributed towards the extraction hole. The sealing plate is threaded with a sealing block that closes the disassembly hole in the disassembly hole. The upper end face of the sealing block is provided with a cross-shaped drive groove.

[0023] Preferably, one end of the sealing plate extends to the side wall of the extension plate away from the furnace body and abuts against one side of the partition plate. The sealing plate is fixedly connected to the mounting box by a number of locking screws.

[0024] Preferably, the upper end wall of the extraction hole is located above the upper end face of the turntable, and the width of the extraction hole extends to both sides of the width of the slide groove.

[0025] Preferably, the closure includes an arc-shaped plate that enters the extraction hole and a mounting plate disposed on the outer wall of the arc-shaped plate. The mounting plate is distributed along the outer wall of the mounting box and is mounted on the outer wall of the mounting box by a plurality of connecting screws. The side of the arc-shaped plate opposite to the mounting plate is flush with the inner wall of the mounting box.

[0026] The beneficial effects of the present invention are as follows: the pusher is located below the first feed inlet, which facilitates the reception of solid materials flowing out of the first feed inlet. The solid materials are pushed and dispersed by the reciprocating pusher plate, thereby changing the initial drop position of the solid materials at the top of the steps and keeping the material flow unobstructed, which facilitates subsequent combustion and improves the dispersion of the solid materials. As the length and speed of the pusher plate change as it moves into the furnace body, the drop position of the solid materials pushed by the pusher plate can be further changed. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of this embodiment;

[0029] Figure 2 This is a structural schematic diagram illustrating one side wall of the furnace body in this embodiment;

[0030] Figure 3 This is a schematic diagram illustrating the structure of the mounting box in this embodiment;

[0031] Figure 4 This is a schematic diagram illustrating the structure of the power source in this embodiment;

[0032] Figure 5 This is a schematic diagram illustrating the structure of the enclosed plate in this embodiment;

[0033] Figure 6 This is a schematic diagram illustrating the structure of the electric cylinder in this embodiment;

[0034] Figure 7 This is a schematic diagram illustrating the structure of the curved surface in this embodiment;

[0035] Figure 8 This is a schematic diagram illustrating the structure of the mounting slot in this embodiment.

[0036] Explanation of reference numerals in the attached figures:

[0037] In the diagram: 1. Furnace body; 11. Steps; 12. Pulse jetting mechanism; 13. Tertiary air duct; 14. Solid material feed pipe; 15. First feed inlet; 16. Mounting box; 161. Push plate; 162. Replacement plate; 163. Sealing plate; 164. Turntable; 165. Slide groove; 166. Drive plate; 167. Power source; 168. Extension plate; 1681. Partition plate; 1682. Air inlet pipe; 1683. Electric cylinder; 1684. Connecting column; 17. First long strip groove; 171. Second long strip groove; 172. Arc surface; 18. Mounting groove; 181. Mounting block; 182. Fastening screw; 183. Sealing block; 184. Arc plate; 2. Decomposition furnace. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] A combustion system for an external furnace in a cement kiln, such as Figure 1-6 It includes a furnace body 1 and a staircase 11 installed inside the furnace body 1. The bottom and sides of the steps of the staircase 11 are equipped with a jetting mechanism 12. It also includes a tertiary air duct 13 installed above the furnace body 1, which is existing technology and will not be described in detail here.

[0040] like Figure 1-6A solid material feed pipe 14 is provided on one side of the tertiary air duct 13 above the furnace body 1. The solid material feed pipe 14 is connected to the side wall of the furnace body 1. A first feed port 15 is provided on the side wall of the furnace body 1, which is connected to the solid material feed pipe 14. The first feed port 15 is located at the top of the step 11. The solid material feed pipe 14 extends upward and is provided with two gate valves at intervals. A screw conveyor is connected to the upper end of the solid material feed pipe 14. The feed port of the screw conveyor is provided with a feed hopper. The screw conveyor is used to transport the solid material in the feed hopper to the solid material feed pipe 14. The two gate valves on the solid material feed pipe 14 are used to control the amount of solid material entering the first feed port 15.

[0041] like Figure 1-6 The lower end of the furnace body 1 is connected to the decomposition furnace 2. The furnace body 1 has a pusher on the side wall with the first feed inlet 15. The pusher is located below the first feed inlet 15. The pusher includes a mounting box 16 installed on the outer wall of the furnace body 1. A horizontally movable push plate 161 is slidably connected in the mounting box 16. The width of the inner wall of the furnace body 1 is slightly larger than the width of the push plate 161. When solid material enters the furnace body 1 from the solid material feed pipe 14 through the first feed inlet 15, the solid material falling towards the push plate 161 is pushed by the reciprocating push plate 161, thereby changing the position of the solid material in the furnace body 1.

[0042] like Figure 1-6 The pusher is located below the first feed inlet 15 to facilitate the collection of solid material flowing out of the first feed inlet 15. The solid material is pushed and dispersed by the reciprocating pusher plate 161, thereby changing the initial drop position of the solid material at the top of the steps 11 and keeping the material flow unobstructed, which facilitates subsequent combustion and improves the dispersion of the solid material. As the length and speed of the pusher plate 161 change as it moves into the furnace body 1, the drop position of the solid material pushed by the pusher plate 161 can be further changed.

[0043] like Figure 1-6 When the push plate 161 needs to be repaired after a period of use, the mounting box 16 is equipped with a replacement plate 162 to replace the push plate 161, so that the external boiler can replace the push plate 161 without stopping the machine. The mounting box 16 is equipped with an adjustment component that allows the replacement plate 162 to replace the push plate 161.

[0044] The difficulty in designing the adjustment component lies in the fact that when changing the pusher plate 161, it is also necessary to close the first feed port 15, and in addition, the air pressure inside the furnace body 1 must be considered.

[0045] like Figure 1-6The mounting box 16 is a circular box with the opening facing upward. The circular box has a notch on the side near the furnace body 1 that fits against the outer wall of the furnace body 1. The mounting box 16 is fixedly installed on the furnace body 1. Several support rods for fixing the bottom of the mounting box 16 are provided on the outer wall of the furnace body 1. The upper end of the mounting box 16 is provided with a sealing plate 163 to close the opening of the mounting box 16.

[0046] like Figure 1-6 The adjusting component includes a turntable 164 rotatably connected to the bottom of the mounting box 16. The turntable 164 covers the bottom of the mounting box 16, meaning that the outer wall of the turntable 164 is in contact with the inner wall of the mounting box 16. A groove 165 is provided on the upper surface of the turntable 164. The groove 165 is distributed along the diameter of the rotating shaft and extends through the outer wall of the turntable 164. The push plate 161 and the replacement plate 162 are slidably connected in the groove 165. A drive plate 166 located between the push plate 161 and the replacement plate 162 is slidably connected in the groove 165. The end of the drive plate 166 that contacts the push plate 161 and the replacement plate 162 is detachably connected by a connector. The connector facilitates the rotation of the push plate 161 and the replacement plate 162 with the rotation of the turntable 164, and facilitates disassembly when it is necessary to disassemble the push plate 161 or the replacement plate 162.

[0047] like Figure 1-6 An entry groove is provided on the side wall of the furnace body 1 for the turntable 164 to enter the furnace body 1. After the push plate 161, drive plate 166 and replacement plate 162 are connected as a whole, the opposite sides of the push plate 161 and replacement plate 162 extend to a position flush with the side wall of the turntable 164, and the opposite sides of the push plate 161 and replacement plate 162 are both set as arc-shaped surfaces that cooperate with the outer wall of the turntable 164. The mounting box 16 is provided with a drive component that drives the drive plate 166 to move in the slide groove 165 towards the entry groove. The driving component is used to drive the push plate 161 or the replacement plate 162 located in the furnace body 1 to reciprocate, thereby facilitating the material pushing. During the movement, the maximum length of the push plate 161 or the replacement plate 162 moving into the furnace body 1 changes with the driving component. The shortest length moving into the furnace body 1 is when one side of the push plate 161 or the replacement plate 162 is flush with the side wall of the turntable 164. The lower outer wall of the mounting box 16 is provided with a power source 167 for driving the turntable 164 to rotate. The power source 167 can be a servo motor.

[0048] like Figure 1-6 The regulating component is also equipped with a pressurizing component. When the regulating component is working, the pressurizing component increases the pressure on the side of the mounting box 16 near the inlet slot. The design of the pressurizing component creates a continuous airflow near the inlet slot, thereby forming an air curtain that can effectively prevent the leakage of dust and harmful gases inside the furnace body 1, especially when the regulating component replaces the push plate 161 or the replacement plate 162; the pressurizing component can introduce gas into the pressurized space to form an air curtain near the inlet slot.

[0049] like Figure 1-6 The outer wall of the furnace body 1 is provided with an extension plate 168 extending to the upper end of the mounting box 16. On the side of the extension plate 168 away from the furnace body 1, there is a partition plate 1681 extending into the mounting box 16 and extending to the upper end of the turntable 164. The turntable 164 rotates below the partition plate 1681, that is, the upper end of the turntable 164 contacts the lower end of the partition plate 1681. The extension plate 168 is fixed to the upper end of the mounting box 16. A pressurization space is formed between the extension plate 168, the partition plate 1681, the inner wall of the mounting box 16 and the outer wall of the furnace body 1. The pressurization component includes an air inlet pipe 1682 provided on the extension plate 168. The air inlet pipe 1682 is connected to an air source. When the adjustment component replaces the push plate 161, the air inlet pipe 1682 pressurizes the pressurization space below the extension plate 168 through the air source, and then the adjustment component starts working again.

[0050] like Figure 1-6 One end of the sealing plate 163 extends to the side wall of the extension plate 168 away from the furnace body 1 and abuts against one side of the partition plate 1681. The sealing plate 163 is fixedly connected to the mounting box 16 by several locking screws (not shown in the figure). When it is necessary to open the sealing plate 163, the sealing plate 163 can be opened by locking screws.

[0051] like Figure 1-6 The driving component includes an electric cylinder 1683 disposed on the inner wall of the mounting box 16 and located above the turntable 164. The upper end face of the drive plate 166 is rotatably provided with an upwardly extending connecting column 1684. The piston rod of the electric cylinder 1683 drives the connecting column 1684 to move. When the piston rod of the electric cylinder 1683 pushes the connecting column 1684 to move, the length direction of the piston rod of the electric cylinder 1683 is distributed along the length direction of the slide groove 165.

[0052] like Figure 2 and Figure 7The entry groove includes a first elongated groove 17 for one end of the push plate 161 or the replacement plate 162 to enter the furnace body 1, and a second elongated groove 171 for one end of the turntable 164 at the lower end of the sliding groove 165 to enter the furnace body 1. The first elongated groove 17 and the second elongated groove 171 are connected, and the length of the second elongated groove 171 is less than the length of the first elongated groove 17. An arc surface 172 is provided on the outer wall of the furnace body 1 to cooperate with the first elongated groove 17 and the second elongated groove 171. The arc surface 172 allows the turntable 164 and the push plate 161 or the replacement plate 162 to slide into the second elongated groove 171 or the first elongated groove 17, respectively. The purpose of this design is to facilitate the alternating entry of the push plate 161 or the replacement plate 162 into the first elongated groove 17 as the turntable 164 rotates. When the push plate 161 or the replacement plate 162 has not rotated into the first elongated groove 17, the outer wall of the turntable 164 closes the first elongated groove 17, and one end is located inside the furnace body 1, until the push plate 161 or the replacement plate 162 rotates into the first elongated groove 17 to complete the replacement work. Then, it can be driven by the electric cylinder 1683 to move back and forth inside the furnace body 1.

[0053] like Figure 1-6 The mounting box 16 has an extraction hole on its wall that is opposite to the entry groove and allows the push plate 161 or the replacement plate 162 to be pulled out of the mounting box 16. The outer wall of the mounting box 16 is detachably provided with a sealing member to close the extraction hole. The upper end of the extraction hole is located above the upper end face of the turntable 164, and the two sides of the width of the extraction hole extend to the two sides of the width of the slide groove 165, which facilitates the extraction of the push plate 161 or the replacement plate 162 that is removed from the furnace body 1.

[0054] like Figure 1-6 The closure includes an arc-shaped plate 184 that enters the extraction hole and a mounting plate disposed on the outer wall of the arc-shaped plate 184. The mounting plate is distributed along the outer wall of the mounting box 16 and is mounted on the outer wall of the mounting box 16 by several connecting screws (not shown in the figure). The side of the arc-shaped plate 184 facing away from the mounting plate is flush with the inner wall of the mounting box 16 (not shown in the figure). When disassembling the closure, simply unscrew the connecting screws to remove the arc-shaped plate 184 and the mounting plate from the outer wall of the mounting box 16, open the extraction hole, and then pull out the push plate 161 or the replacement plate 162.

[0055] like Figure 6 and Figure 8The connecting component includes mounting slots 18 on the drive plate 166, which face the push plate 161 and the replacement plate 162 respectively. At this time, there are two mounting slots 18 on the drive plate 166, which are located on both sides of the connecting post 1684. The vertical center line of the connecting post 1684 passes through the center line of the turntable 164. The push plate 161 and the replacement plate 162 are provided with mounting blocks 181 extending into the two mounting slots 18 respectively. The upper end face of the drive plate 166 is threaded with a fastening screw 182 that enters the mounting block 181. The sealing plate 163 is provided with a disassembly hole corresponding to one of the fastening screws 182. The fastening screw 182 fixes the push plate 161 or the replacement plate 162 that is distributed towards the extraction hole. The sealing plate 163 is threaded with a sealing block 183 that closes the disassembly hole. The upper end face of the sealing block is provided with a cross-shaped drive groove (not shown in the figure).

[0056] like Figure 6 and Figure 8 The purpose of this design is that after the push plate 161 is replaced by the replacement plate 162, the push plate 161 faces the extraction hole, and the fastening screw 182 of the mounting block 181 on the push plate 161 is directly opposite the disassembly hole. The operator can open the disassembly hole by turning the sealing block 183 with a screwdriver, and then turn the fastening screw 182 with a screwdriver to separate the fastening screw 182 from the mounting block 181. At this time, one end of the fastening screw 182 is still screwed on the drive plate 166. Then the push plate 161 is pulled out and a new push plate 161 is replaced until the mounting block 181 on the new push plate 161 re-enters the mounting groove 18. Then the fastening screw 182 is turned to fix the new push plate 161 on the drive plate 166, and finally the extraction hole is closed. After the replacement plate 162 has been working for a period of time, the servo motor drives the turntable 164 to rotate 180°, and then the new push plate 161 enters the furnace body 1, and the replacement plate 162 is pulled out. At this time, the fastening screws 182 on the replacement plate 162 are aligned with the disassembly holes. The replacement plate 162 can be removed and replaced according to the above steps, or if it is found that the replacement plate 162 can still be used, the replacement plate 162 can be reinstalled on the drive plate 166. In the above process, it is not necessary to disassemble the sealing plate 163, and the pressure booster needs to work.

[0057] In addition, a mud feed pipe can be provided on the side wall of the furnace body 1 where the first feed inlet 15 is located. At this time, the mud feed pipe is located on the horizontal side of the first feed inlet 15, which makes it convenient for the pusher plate 161 to push the material together.

[0058] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A combustion system for an external furnace in a cement kiln, comprising a furnace body (1) and a staircase (11) disposed within the furnace body (1), wherein the bottom and sides of the steps of the staircase (11) are provided with injection mechanisms (12), and further comprising a tertiary air duct (13) disposed above the furnace body (1), characterized in that, A solid material feed pipe (14) is provided on one side of the tertiary air duct (13) above the furnace body (1). The solid material feed pipe (14) is connected to the furnace body (1) at the side wall of the furnace body (1). A first feed port (15) connected to the solid material feed pipe (14) is provided on the side wall of the furnace body (1). The first feed port (15) is located at the top of the step (11). The lower end of the furnace body (1) is connected to the decomposition furnace (2). The furnace body (1) has a pusher on the side wall with a first feed inlet (15). The pusher is located below the first feed inlet (15). The pusher includes an installation box (16) installed on the outer wall of the furnace body (1). A movable push plate (161) is slidably connected inside the installation box (16). When solid material enters the furnace body (1) from the solid material feed pipe (14) through the first feed inlet (15), the solid material falling towards the push plate (161) is pushed by the reciprocating push plate (161), thereby changing the position of the solid material in the furnace body (1). When the push plate (161) needs to be repaired after a period of use, the mounting box (16) is provided with a replacement plate (162) to replace the push plate (161), and the mounting box (16) is provided with an adjustment component to replace the push plate (161) with the replacement plate (162); The adjusting component includes a turntable (164) rotatably connected to the bottom of the mounting box (16). The turntable (164) covers the bottom of the mounting box (16). A groove (165) is provided on the upper surface of the turntable (164). The groove (165) is distributed along the diameter of the rotating shaft and extends through the outer wall of the turntable (164). The push plate (161) and the replacement plate (162) are slidably connected in the groove (165). A drive plate (166) located between the push plate (161) and the replacement plate (162) is slidably connected in the groove (165). An entry groove is provided on the side wall of the furnace body (1) for the turntable (164) to enter the furnace body (1). After the push plate (161), drive plate (166) and replacement plate (162) are connected as a whole, the opposite sides of the push plate (161) and replacement plate (162) extend to a position flush with the side wall of the turntable (164). The mounting box (16) is provided with a driving component that drives the drive plate (166) to move in the groove (165) towards the groove. The lower outer wall of the mounting box (16) is provided with a power source (167) that drives the turntable (164) to rotate. The adjusting component is also equipped with a pressure boosting component. When the adjusting component is working, the pressure boosting component increases the pressure on the side of the mounting box (16) near the inlet groove.

2. A combustion system for an external burner of a cement kiln as defined in claim 1, characterized in that The mounting box (16) is a circular box with the opening facing upward. The circular box has a notch on the side near the furnace body (1) that fits against the outer wall of the furnace body (1). The mounting box (16) is fixedly installed on the furnace body (1). The upper end of the mounting box (16) is provided with a sealing plate (163) to close the opening of the mounting box (16). The drive plate (166) is detachably connected to the push plate (161) and the replacement plate (162) respectively by a connector; the opposite sides of the push plate (161) and the replacement plate (162) are both set as arc-shaped surfaces that cooperate with the outer wall of the turntable (164).

3. A combustion system for an external burner of a cement kiln as defined in claim 2, characterized in that The outer wall of the furnace body (1) is provided with an extension plate (168) extending to the upper end of the mounting box (16). The side of the extension plate (168) away from the furnace body (1) is provided with a partition plate (1681) extending into the mounting box (16) and extending to the upper end of the turntable (164). The turntable (164) rotates below the partition plate (1681). The extension plate (168) is fixed to the upper end of the mounting box (16). A pressurization space is formed between the extension plate (168), the partition plate (1681), the inner wall of the mounting box (16), and the outer wall of the furnace body (1). The pressurization component includes an air inlet pipe (1682) provided on the extension plate (168).

4. A combustion system for an external burner of a cement kiln as defined in claim 2, wherein The driving component includes an electric cylinder (1683) disposed on the inner wall of the mounting box (16) and located above the turntable (164). The upper end face of the driving plate (166) is rotatably provided with an upwardly extending connecting column (1684). The piston rod of the electric cylinder (1683) drives the connecting column (1684) to move. The mounting box (16) has an extraction hole on its wall that is opposite to the entry slot and is used for the push plate (161) or the replacement plate (162) to pull out the mounting box (16). The outer wall of the mounting box (16) is detachably provided with a sealing member to close the extraction hole.

5. A combustion system for an external burner of a cement kiln as defined by Claim 2, wherein The entry slot includes a first elongated slot (17) for one end of the push plate (161) or the replacement plate (162) to enter the furnace body (1) and a second elongated slot (171) for one end of the turntable (164) at the lower end of the slide groove (165) to enter the furnace body (1). The first elongated slot (17) and the second elongated slot (171) are connected and the length of the second elongated slot (171) is less than the length of the first elongated slot (17). An arc surface (172) is provided on the outer wall of the furnace body (1) to cooperate with the first elongated slot (17) and the second elongated slot (171). The arc surface (172) allows the turntable (164) and the push plate (161) or the replacement plate (162) to slide into the second elongated slot (171) or the first elongated slot (17) respectively.

6. The combustion system of an external furnace in a cement kiln as described in claim 4, characterized in that, The connector includes mounting slots (18) formed on the drive plate (166) and facing the push plate (161) and the replacement plate (162) respectively. There are two mounting slots (18) located on both sides of the connecting post (1684). The vertical center line of the connecting post (1684) passes through the center line of the turntable (164). The push plate (161) and the replacement plate (162) are provided with mounting blocks (181) extending into the two mounting slots (18) respectively. (166) The upper end face is threaded with a fastening screw (182) that enters the mounting block (181). The sealing plate (163) has a disassembly hole corresponding to one of the fastening screws (182). The fastening screw (182) fixes a push plate (161) or a replacement plate (162) that is distributed towards the extraction hole. The sealing plate (163) has a sealing block (183) that closes the disassembly hole threaded in the disassembly hole. The upper end face of the sealing block has a cross-shaped drive groove.

7. The combustion system of an external furnace in a cement kiln as described in claim 6, characterized in that, One end of the sealing plate (163) extends to the side wall of the extension plate (168) away from the furnace body (1) and abuts against one side of the partition plate (1681). The sealing plate (163) is fixedly connected to the mounting box (16) by several locking screws.

8. A combustion system for an external burner of a cement kiln as defined in claim 4, wherein The upper end wall of the extraction hole is located above the upper end face of the turntable (164), and the two sides of the width of the extraction hole extend out to the two sides of the width of the groove (165).

9. The combustion system of an external furnace in a cement kiln as described in claim 8, characterized in that, The closure includes an arc-shaped plate (184) that enters the extraction hole and an mounting plate disposed on the outer wall of the arc-shaped plate (184). The mounting plate is distributed along the outer wall of the mounting box (16) and is mounted on the outer wall of the mounting box (16) by a number of connecting screws. The side of the arc-shaped plate (184) facing away from the mounting plate is flush with the inner wall of the mounting box (16).

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