Automatic adjusting device for coal injection duct of decomposing furnace

Abstract

The utility model relates to the technical field of decomposing furnaces in cement plants, and discloses an automatic adjusting device for a coal injection duct of a decomposing furnace, which comprises the decomposing furnace, and four automatic adjusting devices are uniformly distributed in the circumferential direction of the decomposing furnace. The automatic adjusting device is characterized by comprising a shell, a sealing flexible connector, a coal injection pipe, an angle sensor, a rotating shaft, a driving device, a suspension, a driving wheel, a driven wheel and an electric control device. According to the utility model, the coal injection direction or the length of the coal injection pipe extending into the hearth is adjusted in real time on line: on the premise of not reducing the total amount of coal powder entering the furnace, when the local temperature is too high, the coal injection direction of the coal injection pipe is adjusted to prevent the coal powder from being continuously injected into a high-temperature area, and the coal powder can be continuously injected into the high-temperature area by adjusting the length of the coal injection pipe extending into the hearth. The effect of local temperature control in the furnace can be achieved by adjusting the distance of jet flames, and a plurality of automatic coal injection duct adjusting devices are evenly distributed on the circumference of the furnace wall of the decomposing furnace, so that the coal injection direction in the decomposing furnace is automatically adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of decomposition furnaces in cement plants, and more particularly to an automatic regulating device for a coal injection pipe of a decomposition furnace. Background Art

[0002] The cement plant's precalciner requires the injection of pulverized coal into the furnace through a coal injection pipe. When the high-temperature air flow field in the furnace changes, pulverized coal accumulates in a certain area or the oxygen content increases, the combustion tends to generate more heat, causing localized overheating and leading to crusting and blockage in the furnace. In addition, improper adjustment of the raw meal feed rate can also cause localized overheating in the precalciner cone (the coal injection point), leading to crusting and blockage. Once this occurs, manual cleaning is required, which is time-consuming and labor-intensive. In severe cases, it can even cause the kiln to shut down.

[0003] At present, most cement plants do not have the means to deal with the local high temperature in the decomposition furnace. Most of them are installed with fixed coal injection pipes, which cannot adjust the direction of coal injection. When local high temperature occurs, it is impossible to achieve the goal of controlling and lowering the temperature of the high temperature area. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the utility model provides an automatic adjustment device for a coal injection pipe of a decomposition furnace to solve the problems existing in the above-mentioned background technology.

[0005] The utility model provides the following technical solution: an automatic adjustment device for a coal injection pipe of a decomposition furnace, comprising a decomposition furnace, and four automatic adjustment devices evenly distributed in the circumferential direction of the decomposition furnace, characterized in that the automatic adjustment device comprises a housing, a sealing flexible connection, a coal injection pipe, an angle sensor, a rotating shaft, a driving device, a suspension, a driving wheel, a driven wheel and an electronic control device;

[0006] The shell of the regulating device is welded to the opening in the wall of the decomposition furnace, and one end extends into the decomposition furnace for a distance; the coal injection pipe is arranged inside the shell, and two upper and lower rotating shafts are provided to connect the coal injection pipe and the shell, the upper and lower outer walls of the coal injection pipe are provided with slide grooves, and the connection with the rotating shaft adopts a square tenon-slide groove structure, and the shell and the rotating shaft are connected by a rotating connection; the upper part of the rotating shaft is stuck in the boss ring on the top of the shell, and the part of the rotating shaft passing through the bottom of the shell adopts a stepped shaft form; a driven wheel is fixed to the lower part of the rotating shaft, and the driven wheel can rotate synchronously with the rotating shaft; an angle sensor is provided on the top of the rotating shaft to monitor the angle of rotation of the rotating shaft; the suspension is fixed to the lower part of the shell, the driving device is fixed on the suspension, and the driving wheel is fixed on the output shaft of the driving device and can rotate synchronously with the output shaft.

[0007] The outer surface of the coal injection pipe is equipped with a chute on each of the upper and lower cylindrical surfaces. A square tenon is provided at one end of each of the upper and lower rotating shafts, which inserts into the corresponding chute. This allows the coal injection pipe to move as a whole, following the guidance of the square tenon and the chute. To adjust the length of the coal injection pipe entering the furnace, the pipe can be pushed or pulled along the guide of the square tenon and the chute.

[0008] When the coal injection pipe is adjusted, the driving device drives the driving wheel to rotate to a certain angle, drives the driven wheel to rotate, and then drives the rotating shaft to rotate. The rotation of the rotating shaft can drive the coal injection pipe to rotate to a certain angle.

[0009] The electronic control device can be installed on the ground near the adjustment device. A given value for the angle between the centerline of the coal injection pipe and the centerline of the housing (i.e., the angle between the coal injection direction and the circumferential normal) can be set on the electronic control device. The electronic control device can collect the angle value of the centerline of the coal injection pipe and the centerline of the housing from the angle sensor according to the communication protocol. Based on the collected angle value, the electronic control device implements PID control of the drive device to rotate the coal injection pipe to the set angle position.

[0010] The number of electronic control devices is preferably one to adjust and feedback all the adjustment devices evenly distributed along the circumference. The electronic control device is preferably integrated with a liquid crystal control panel. The user can set the angle α between the coal injection direction and the circumferential normal on the control panel and observe the actual angle value fed back by the angle sensor.

[0011] The angle sensor and the electronic control device are connected using a wired RS485 protocol. The servo motor driver is connected to the electronic control device using the RS485 protocol. The servo motor driver has a torque mode to monitor the output torque to prevent motor overload.

[0012] The electronic control device can switch between local and remote control. When switched to remote control, the electronic control device and the cement plant's central control room use DCS communication. The collected angle value of the electronic control device is fed back to the computer screen in the central control room. The central control personnel can remotely set the coal injection angle value on the computer, and the DCS communicates with the PLC of the electronic control device to control the operation of the servo motor and implement remote adjustment of the coal injection angle.

[0013] The driving wheel and the driven wheel of the present invention are open gears, and the gear meshing surfaces need to be regularly smeared with grease, preferably molybdenum disulfide solid lubricant, to ensure better meshing of the gears.

[0014] The clearance between the rotating shaft and the housing in the diameter direction shall not be greater than 0.005 times the diameter of the rotating shaft to ensure smooth rotation.

[0015] Preferably, swirl blades are provided in the coal injection pipe to extend the coal injection distance.

[0016] Preferably, reinforcing ribs are provided on the outside of the suspension to prevent the suspension from being deformed due to excessive disturbance.

[0017] Preferably, the material of the sealing flexible connection is high-temperature resistant ceramic fiber cloth, and its performance meets the use requirement of temperature resistance of 1000°C.

[0018] Preferably, the servo motor is a permanent magnet AC servo motor with a rated speed of 1500 to 2000 rpm; its matching reducer is preferably a planetary reducer with a speed ratio of not less than 50.

[0019] Preferably, the driving wheel and the driven wheel are driven by gear meshing, the gear modules of the driving wheel and the driven wheel are equal, and the preferred gear ratio between the two is 1:2.

[0020] Preferably, the shell, the rotating shaft and the coal injection pipe are made of heat-resistant steel 310S, the driving wheel and the driven wheel are made of 40Cr quenched and tempered steel, and the gear tooth surfaces are subjected to high-frequency quenching heat treatment.

[0021] The technical effects and advantages of this utility model are:

[0022] 1. The utility model solves the problem by adjusting the coal injection direction or the length of the coal injection pipe extending into the furnace in real time online: without reducing the total amount of coal powder entering the furnace, when it is found that the local temperature is too high, the coal injection direction of the coal injection pipe is adjusted to prevent coal powder from continuing to be sprayed into the high-temperature area.

[0023] 2. The utility model can achieve the effect of local temperature control in the furnace by adjusting the length of the coal injection pipe extending into the furnace and adjusting the distance of the injection flame.

[0024] 3. The utility model achieves automatic adjustment of the coal injection direction into the decomposition furnace by evenly distributing a number of coal injection pipe automatic adjustment devices on the circumference of the decomposition furnace wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a cross-sectional schematic diagram of the installation position of the coal injection pipe automatic adjustment device of the utility model in the decomposition furnace.

[0026] Figure 2 For the utility model Figure 1 I-section view.

[0027] Figure 3 For the utility model Figure 2 AA cross-sectional view.

[0028] Figure 4 For the utility model Figure 2 BB cross-sectional view.

[0029] Figure 5 For the utility model Figure 3 CC cross-sectional view.

[0030] Figure 6For the utility model Figure 4 DD cross-sectional view.

[0031] The accompanying drawings are marked as follows: 1. automatic adjustment device; 2. decomposition furnace; 10. electronic control device; 11. housing; 12. sealing flexible connection; 13. coal injection pipe; 131. slide; 14. angle sensor; 15. rotating shaft; 151. square tenon; 16. driving device; 17. suspension; 18. driving wheel; 19. driven wheel. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely examples. The present invention is not limited to the various structures recorded in the following embodiments. All other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] Reference Figures 1-6The utility model provides an automatic adjustment device for a coal injection pipe of a decomposition furnace, comprising a decomposition furnace 2, four automatic adjustment devices 1 evenly distributed in the circumferential direction of the decomposition furnace 2, the automatic adjustment device 1 comprising a shell 11, a sealing flexible connection 12, a coal injection pipe 13, an angle sensor 14, a rotating shaft 15, a driving device 16, a suspension 17, a driving wheel 18, a driven wheel 19 and an electronic control device 10; the shell 11 is welded to a hole pre-opened on the wall of the decomposition furnace 2, and the end thereof extends into the decomposition furnace 2 for a distance, the distance extended into the furnace is greater than the thickness of the lining layer inside the decomposition furnace 2, the coal injection pipe 13 is arranged inside the shell 11, the end thereof extends into the furnace and is flush with the end of the shell 11, the other end of the coal injection pipe 13 is connected to the shell 11 by high-temperature resistant ceramic fiber cloth for sealing, so that the cavity formed between the coal injection pipe 13 and the shell 11 is isolated from the outside air, thereby preventing the negative pressure in the decomposition furnace 2 from sucking cold air into the furnace and affecting the combustion state of the coal powder in the furnace; two upper and lower rotating shafts 15 are provided to connect the coal injection pipe 1 3. Slots 131 are formed on the upper and lower outer walls of the housing 11 and the coal injection pipe 13, and are fixedly connected to the rotating shaft 15 by a square tenon 151. There is a slight gap between the housing 11 and the rotating shaft 15. The upper part of the rotating shaft 15 is stuck in the boss ring at the top of the housing 11. The part of the rotating shaft 15 that passes through the bottom of the housing 11 is in the form of a stepped shaft. A driven wheel 19 is fixed to the lower part of the rotating shaft 15 and can rotate synchronously with the rotating shaft 15. The top of the rotating shaft 15 is provided with an angle sensor 14 for monitoring the rotation angle of the rotating shaft 15. The suspension 17 is fixed to the lower part of the housing 11 and welded to the housing 11. The drive device 16 is fixed to the suspension 17. The driving wheel 18 is fixed to the output shaft of the drive device 16 and can rotate synchronously with the output shaft of the drive device 16. The electronic control device 10 is located on the ground near the drive device 16 to control the drive devices 16 of all four adjustment devices. The given value of the angle between the center line of the coal injection pipe 13 and the center line of the housing 11 can be set on the electronic control device 10.

[0034] In the present invention, the material of the sealing flexible connection 12 is high temperature resistant ceramic fiber cloth, which meets the use requirement of temperature resistance of 1000℃. The driving device 16 is composed of a servo motor integrated with a reducer. The preferred type of servo motor is a permanent magnet AC servo motor, and the preferred type of matching reducer is a planetary reducer. The driving wheel 18 and the driven wheel 19 are driven by gear meshing. The gear modules of the driving wheel 18 and the driven wheel 19 are equal, and the preferred gear ratio of the two is 1:2. The preferred material of the housing 11, the rotating shaft 15 and the coal injection pipe 13 is 310S heat-resistant steel. The driving wheel 18 and The driven wheel 19 is preferably made of 40Cr quenched and tempered steel, and the tooth surface is subjected to high-frequency quenching heat treatment. The electronic control device 10 can set a given value of the angle between the center line of the coal injection pipe 13 and the center line of the housing 11. The electronic control device 10 can collect the angle value of the angle between the center line of the coal injection pipe 13 and the center line of the housing 11 fed back by the angle sensor 14. The electronic control device 10 implements PID regulation of the drive device 16 based on the collected angle value, so that the coal injection pipe 13 rotates to the set angle position. The preferred speed of the servo motor is 1500-2000 rpm, and the preferred speed ratio of the planetary reducer is not less than 50.

[0035] The drive device 16 is installed on the suspension 17 by means of an AC servo motor integrated with a planetary reducer. The servo motor model is a 220V130 motor with a rated power of 1.5kW, a rated speed of 1500rpm, and a rated torque of 10N·m. The motor driver has an RS485 communication port. The servo motor's matching reducer is a three-stage planetary reducer with a speed ratio of 64. The designed speed of the driving wheel is 23.4rpm, and the speed of the driven wheel is 11.7rpm. That is, the designed rotation speed of the coal injection pipe angle adjustment is 1.26rad / s. At the same time, the rated torque obtained by the coal injection pipe steering is 1280N·m, ensuring smooth rotation.

[0036] like Figure 2 As shown in FIG, angle sensor 14 utilizes a single-turn absolute encoder. The coal injection pipe rotates to two extreme positions, left and right. During rotation, the encoder measures the angle α of the coal injection pipe's axial centerline, which deviates from one of these extreme positions. The encoder program calculates the value of angle α using the conversion relationship: angle α = encoder value * 360 / resolution. This value is then communicated to the electronic control device 10 via the RS485 protocol. A PLC is internally installed in the electronic control device 10, which implements PID control of the drive device 16 based on the acquired angle value, rotating the coal injection pipe 13 to the set angle position. This angle value can be manually set on the electronic control device 10's LCD panel or within the control screen of the central control room computer. The central control room and the PLC of the electronic control device 10 utilize a DCS communication protocol.

[0037] Finally, a few points should be noted: In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense, and may refer to mechanical or electrical connections, internal communication between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0038] In the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

Claims

1. An automatic regulating device for a coal injection pipe of a decomposition furnace, comprising a decomposition furnace (2), four automatic regulating devices (1) being evenly distributed in the circumferential direction of the decomposition furnace (2), characterized in that: The automatic adjustment device (1) comprises a housing (11), a sealing flexible connection (12), a coal injection pipe (13), an angle sensor (14), a rotating shaft (15), a driving device (16), a suspension (17), a driving wheel (18), a driven wheel (19) and an electronic control device (10); The shell (11) is welded to a hole pre-opened on the wall of the decomposition furnace (2), and the end thereof is extended into the decomposition furnace (2) for a distance, the distance extended into the furnace being greater than the thickness of the lining layer inside the decomposition furnace (2). The coal injection pipe (13) is arranged inside the shell (11), and the end thereof is extended into the furnace and is flush with the end of the shell (11). The other end of the coal injection pipe (13) is connected to the shell (11) with a high-temperature resistant ceramic fiber cloth for sealing, so that the cavity formed between the coal injection pipe (13) and the shell (11) is isolated from the outside air, thereby preventing the negative pressure in the decomposition furnace (2) from sucking cold air into the furnace and affecting the combustion state of the coal powder in the furnace; Two upper and lower rotating shafts (15) are provided to connect the coal injection pipe (13) and the shell (11). The upper and lower outer walls of the coal injection pipe (13) are both provided with sliding grooves (131) and are fixedly connected with the rotating shaft (15) by using square tenons (151). There is a small gap between the shell (11) and the rotating shaft (15). The upper part of the rotating shaft (15) is stuck in the boss ring at the top of the shell (11). The part of the rotating shaft (15) passing through the bottom of the shell (11) adopts a stepped shaft form. The lower part of the rotating shaft (15) is fixed with a A driven wheel (19) is configured to rotate synchronously with the rotating shaft (15). An angle sensor (14) is provided on the top of the rotating shaft (15) to monitor the angle of rotation of the rotating shaft (15). A suspension (17) is fixed to the lower portion of the housing (11) and welded to the housing (11). A driving device (16) is fixed to the suspension (17). A driving wheel (18) is fixed to the output shaft of the driving device (16) and can rotate synchronously with the output shaft of the driving device (16). The electric control device (10) is arranged on the ground near the driving device (16) to control the driving devices (16) of all four adjustment devices. A given value of the angle between the center line of the coal injection pipe (13) and the center line of the shell (11) can be set on the electric control device (10).

2. The automatic adjustment device for a coal injection pipe of a calciner according to claim 1, characterized in that: The material of the sealing flexible connection (12) is high-temperature resistant ceramic fiber cloth, which meets the use requirement of temperature resistance of 1000°C.

3. The automatic adjustment device for a coal injection pipe of a calciner according to claim 1, characterized in that: The driving device (16) is composed of a servo motor integrated with a speed reducer. The preferred type of the servo motor is a permanent magnet AC servo motor, and the preferred type of the matching speed reducer is a planetary speed reducer.

4. The automatic adjustment device for a coal injection pipe of a calciner according to claim 1, characterized in that: The driving wheel (18) and the driven wheel (19) are driven by gear meshing. The gear modules of the driving wheel (18) and the driven wheel (19) are equal, and the preferred gear ratio between the two is 1:

2.

5. The automatic adjustment device for coal injection pipe of a calciner according to claim 1, characterized in that: The preferred material of the housing (11), the rotating shaft (15) and the coal injection pipe (13) is 310S heat-resistant steel, and the preferred material of the driving wheel (18) and the driven wheel (19) is 40Cr quenched and tempered steel, and the tooth surface is subjected to high-frequency quenching heat treatment.

6. The automatic adjustment device for coal injection pipe of a calciner according to claim 1, characterized in that: The electric control device (10) can be set to a given value of the angle between the center line of the coal injection pipe (13) and the center line of the shell (11). The electric control device (10) can collect the angle value of the angle between the center line of the coal injection pipe (13) and the center line of the shell (11) fed back by the angle sensor (14). The electric control device (10) implements a PID adjustment drive device (16) according to the collected angle value, so that the coal injection pipe (13) rotates to the set angle position.

7. The automatic adjustment device for a coal injection pipe of a calciner according to claim 3, characterized in that: The preferred rotation speed of the servo motor is 1500-2000 rpm, and the preferred speed ratio of the planetary reducer is not less than 50.

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