Emergency discharge mechanism for secondary combustion chamber of rotary kiln

Abstract

The utility model discloses an emergency discharge mechanism for a secondary combustion chamber of a rotary kiln, which is simple in structure and high in safety performance. Comprising a discharge cylinder installed at the top of an emergency discharge chimney of the secondary combustion chamber, the discharge cylinder comprises a connecting section, a diffusion section and an outlet section, the connecting section and the outlet section are both cylindrical, the diameter of the outlet section is larger than that of the connecting section, the diffusion section is fixedly connected between the connecting section and the outlet section, and the outlet section is fixedly connected between the connecting section and the outlet section. A discharge cylinder is arranged in the diffusion section, the diffusion section forms a trumpet-shaped structure with the thick upper portion and the thin lower portion, a discharge cover is arranged at the outlet section, the discharge cover can rotate around the axis of the discharge cylinder, the discharge cover can move up and down relative to the discharge cylinder, a pressure relief channel is formed in the discharge cover, and a pressure relief valve is arranged in the pressure relief channel. And a driving device for driving the discharge cover to act is fixedly mounted on the discharge cylinder.

Description

Technical Field

[0001] The utility model relates to the technical field of secondary combustion, in particular to an emergency discharge mechanism for a secondary combustion chamber of a rotary kiln. Background Art

[0002] Solid (hazardous) waste is fed into the rotary kiln body through the feeding mechanism for high-temperature incineration. After high-temperature incineration, the material is burned into high-temperature flue gas and ash. The high-temperature flue gas and ash enter the secondary combustion chamber from the kiln tail. After the flue gas enters the secondary combustion chamber, the combustible components in it are fully burned. Specifically, the flue gas temperature at the outlet of the secondary combustion chamber is greater than 1100°C, and the flue gas stays in the high-temperature zone for more than 2 seconds, ensuring that the harmful components in the flue gas, including dioxins, are completely decomposed and meet the requirements for the incineration of hazardous waste.

[0003] Under normal operating conditions, the flue gas generated by incineration generates negative pressure when the induced draft fan placed at the end of the incineration line is running, leading the flue gas from the kiln head of the rotary kiln, through the secondary combustion chamber, into the boiler-quenching tower-dry reactor-bag-wet scrubber-induced draft fan-chimney, and finally discharged into the atmosphere. However, sometimes under abnormal operating conditions, the flue gas generated by incineration cannot be discharged from the chimney through the normal incineration system, pipelines and equipment. The amount of flue gas will increase, which may increase the pressure in the system and cause an explosion. It must be discharged from the emergency discharge chimney of the secondary combustion chamber to avoid safety hazards.

[0004] For example, the Chinese patent with publication number CN213655838U discloses an emergency discharge mechanism for the secondary combustion chamber of a rotary kiln, including a valve body of a cylindrical structure for installation on the top of the emergency discharge chimney pipe of the secondary combustion chamber, a valve cover is provided on the top of the valve body, a connecting frame that can rotate around a horizontal axis is provided on the top of the valve body, the valve cover is installed on the connecting frame, and the emergency discharge device of the secondary combustion chamber of the rotary kiln also includes a drive cylinder for applying force to the connecting frame to control the opening / closing of the valve cover, the drive cylinder is connected to a control valve for controlling the action of the drive cylinder, and the control valve is connected to the gas pressure signal inside the valve body. Compared with the prior art, it can automatically open the discharge port and release the pressure when an abnormality occurs in the incineration system, ensure the normal operation of the rotary kiln and the secondary combustion chamber incineration system, shorten the equipment downtime and maintenance time caused by the pressure relief of the explosion relief plate, and reduce the economic expenditure of replacing the explosion relief plate.

[0005] However, when the flue gas cannot be discharged in time and too much flue gas accumulates, the pressure inside the second combustion chamber is relatively high. When the valve cover is opened, the kinetic energy of the flue gas at the discharge port is relatively high, resulting in a large impact force when the flue gas is discharged, which can easily cause damage to people and objects around it and has low safety performance. Utility Model Content

[0006] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide an emergency discharge mechanism for the secondary combustion chamber of a rotary kiln, which has a simple structure and high safety performance.

[0007] In order to solve the above technical problems, the technical solution of the utility model is: an emergency discharge mechanism for a secondary combustion chamber of a rotary kiln, comprising a discharge tube installed on the top of the emergency discharge chimney of the secondary combustion chamber, the discharge tube comprising a connecting section, a diffusion section and an outlet section, the connecting section and the outlet section are both cylindrical, and the diameter of the outlet section is larger than the diameter of the connecting section, the diffusion section is fixedly connected between the connecting section and the outlet section, so that the diffusion section forms a trumpet-shaped structure with a thick upper part and a thin lower part, a discharge cover is provided at the outlet section, the discharge cover can rotate around the axis of the discharge tube, and the discharge cover can move up and down relative to the discharge tube, a pressure relief channel is provided on the discharge cover, and a driving device for driving the discharge cover to move is fixedly installed on the discharge tube.

[0008] Furthermore, a connecting ring plate is fixedly provided at the upper end of the outlet section, and two opposite notches are formed on the connecting ring plate.

[0009] Furthermore, the edge of the discharge cover extends downward to form an annular flange, and two clamping blocks are fixedly provided on the annular flange. The width of the clamping blocks is slightly smaller than the width of the notch, so that the clamping blocks can pass through the notch on the connecting ring plate.

[0010] Furthermore, a sealing baffle ring is fixedly provided on the discharge cover, and the sealing baffle ring is located on the inner side of the annular flange.

[0011] Furthermore, a sealing gasket is fixedly provided between the sealing retaining ring and the annular flange, and the sealing gasket is made of high temperature resistant rubber.

[0012] Furthermore, a pressure relief valve is provided at the pressure relief channel.

[0013] Furthermore, the driving device includes a mounting plate, a lifting plate, a driving cylinder and a mounting frame. The mounting plate is fixedly mounted on the outer wall of the diffusion section of the discharge cylinder, the cylinder body of the driving cylinder is fixedly mounted on the mounting plate, the gas rod of the driving cylinder is fixedly connected to the lifting plate, and the mounting frame is fixedly mounted below the lifting plate.

[0014] Furthermore, the driving device also includes a driving motor, which is fixedly mounted on a mounting frame, and an output shaft of the driving motor passes through the mounting frame and is fixedly connected to the discharge cover, and the output shaft of the driving motor is rotatable relative to the mounting frame.

[0015] By adopting the above technical solution, the utility model has the following beneficial effects:

[0016] 1. The smoke from the emergency exhaust chimney of the secondary combustion chamber enters the connecting section and reaches the diffusion section. As the diameter of the diffusion section increases, the flow rate of the smoke gradually decreases, so that the kinetic energy of the smoke at the outlet section is reduced, the impact force of the smoke when the cover is opened is weakened, and the safety performance is improved;

[0017] 2. The connecting ring plate limits the discharge cover through the block. Even if the pressure inside the secondary combustion chamber is too high, the airflow will not easily lift the discharge cover, thus improving safety performance;

[0018] 3. Improve sealing performance by setting sealing rings and sealing gaskets;

[0019] 4. Release part of the pressure through the pressure relief channel, and then open the discharge cover for emergency discharge to improve safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The structure diagram of the emergency discharge mechanism for the secondary combustion chamber of the rotary kiln of the utility model is shown in FIG. Figure 1 ;

[0021] Figure 2 The structure diagram of the emergency discharge mechanism for the secondary combustion chamber of the rotary kiln of the utility model is shown in FIG. Figure 2 ;

[0022] Figure 3 for Figure 1 A top view of

[0023] Figure 4 for Figure 3 The cross-sectional view along the AA direction;

[0024] Figure 5 for Figure 3 The cross-sectional view along the BB direction;

[0025] Figure 6 for Figure 4 The enlarged view of the C part in FIG.

[0026] Figure 7 for Figure 5 The enlarged view of the D part in FIG.

[0027] Figure 8 This is a schematic diagram of the discharge tube structure of the utility model.

[0028] Reference numerals: 1. discharge cylinder; 2. discharge cover; 3. driving device; 4. connecting section; 5. diffusion section;

[0029] 6. outlet section; 7. connecting ring plate; 8. pressure relief channel; 21. annular flange; 22. clamping block;

[0030] 23. Sealing retaining ring; 24. Sealing gasket; 31. Mounting plate; 32. Lifting plate; 33. Driving cylinder;

[0031] 34. Mounting frame; 35. Driving motor; 71. Notch; 81. Pressure relief valve; 100. Exhaust chimney. DETAILED DESCRIPTION

[0032] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0033] like Figure 1-8 As shown, in the present embodiment, an emergency discharge mechanism for a secondary combustion chamber of a rotary kiln is provided, comprising a discharge tube 1 installed on the top of an emergency discharge chimney 100 of the secondary combustion chamber, a discharge cover 2 is provided at the upper end of the discharge tube 1, the discharge cover 2 can rotate around the axis of the discharge tube 1, and the discharge cover 2 can move up and down relative to the discharge tube 1, and a driving device 3 for driving the discharge cover 2 to move is fixedly installed on the discharge tube 1.

[0034] like Figure 1-8 As shown, in the present embodiment, the discharge tube 1 comprises a connecting section 4, a diffusion section 5 and an outlet section 6, which are connected in sequence, and the other end of the connecting section 4 is fixedly connected to the secondary combustion chamber emergency discharge chimney 100, and the connecting section 4 and the outlet section 6 are both cylindrical, and the diameter of the outlet section 6 is larger than the diameter of the connecting section 4, and the diffusion section 5 is fixedly connected between the connecting section 4 and the outlet section 6, so that the diffusion section 5 forms a trumpet shape which is thick at the top and thin at the bottom, and the smoke flowing out of the secondary combustion chamber emergency discharge chimney 100 enters the connecting section 4 and then reaches the diffusion section 5, and as the diameter of the diffusion section 5 continues to increase, the flow rate of the smoke gradually decreases, so that the kinetic energy of the smoke at the outlet section 6 is reduced, the impact force of the smoke when the cover is opened is weakened, and the safety performance is improved.

[0035] like Figure 1-8As shown, in this embodiment, a connecting ring plate 7 is fixedly provided at the upper end of the outlet section 6, and two opposite notches 71 are provided on the connecting ring plate 7. The discharge cover 2 is arranged at the outlet section 6, and the edge of the discharge cover 2 extends downward to form an annular flange 21, so that the annular flange 21 of the discharge cover 2 can surround the connecting ring plate 7 at the upper end of the discharge cylinder 1, and two clamping blocks 22 are fixedly provided on the annular flange 21 of the discharge cover 2, and the width of the clamping blocks 22 is slightly smaller than the width of the notch 71, so that the clamping blocks 22 can pass through the notch 71 on the connecting ring plate 7 to cover the discharge cover 2. Cover the upper end of the discharge cylinder 1, and make the block 22 pass through the notch 71 on the connecting ring plate 7 until the bottom of the discharge cover 2 abuts against the upper end surface of the connecting ring plate 7, rotate the discharge cover 2, and the block 22 on the discharge cover 2 rotates relative to the notch 71, so that the block 22 abuts against the lower end surface of the connecting ring plate 7, so that the discharge cover 2 is fixedly connected to the discharge cylinder 1, and the connecting ring plate 7 limits the discharge cover 2 by the block 22. Even if the pressure inside the secondary combustion chamber is too large, the airflow will not easily lift up the discharge cover 2, thereby improving the safety performance.

[0036] like Figure 4-7 As shown, in the present embodiment, a sealing baffle ring 23 is fixedly provided on the discharge cover 2, and the sealing baffle ring 23 is located on the inner side of the annular flange 21. The sealing baffle ring 23 is formed by solidifying fine sand. The fine sand has good sealing effect, high temperature resistance, anti-aging, low cost, and is easy to replace. A sealing gasket 24 is fixedly provided between the sealing baffle ring 23 and the annular flange 21. The material of the sealing gasket 24 is high temperature resistant rubber. When the discharge cover 2 is fixedly connected to the discharge cylinder 1, the sealing baffle ring 23 abuts against the inner wall of the outlet section 6 of the discharge cylinder 1, and the sealing gasket 24 undergoes elastic deformation. The upper and lower end faces of the sealing gasket 24 abut between the discharge cover 2 and the connecting ring plate 7, and the inner and outer side walls of the sealing gasket 24 abut between the annular flange 21 and the sealing baffle ring 23, thereby further improving the sealing performance.

[0037] like Figure 1 , 4 As shown in Figures 6, in the present embodiment, a pressure relief channel 8 is provided on the discharge cover 2, and a pressure relief valve 81 is provided at the pressure relief channel 8. When the air pressure in the secondary combustion chamber is too high, when the discharge cover 2 is directly opened, the internal pressure is too large, and the airflow can easily lift up the discharge cover 2 and cause damage. At the same time, if the discharge cover 2 is damaged, it can easily cause harm to people and objects around it. Part of the pressure can be released through the pressure relief channel 8, and then the discharge cover 2 can be opened for emergency discharge to improve safety performance.

[0038] like Figure 1-5As shown, in this embodiment, the driving device 3 includes a mounting plate 31, a lifting plate 32, a driving cylinder 33, a mounting frame 34 and a driving motor 35. The mounting plate 31 is fixedly mounted on the outer wall of the diffusion section 5 of the discharge cylinder 1, the cylinder body of the driving cylinder 33 is fixedly mounted on the mounting plate 31, the gas rod of the driving cylinder 33 is fixedly connected to the lifting plate 32, the mounting frame 34 is fixedly mounted below the lifting plate 32, the driving motor 35 is fixedly arranged on the mounting frame 34, the output shaft of the driving motor 35 passes through the mounting frame 34 and is fixedly connected to the discharge cover 2, and the output shaft of the driving motor 35 is rotatable relative to the mounting frame 34.

[0039] When the driving cylinder 33 is working, it drives the lifting plate 32 to move up and down. The discharge cover 2 is connected to the lifting plate 32 through the mounting frame 34, so that the lifting plate 32 can synchronously drive the discharge cover 2 to move up and down when moving. At the same time, the driving motor 35 can drive the discharge cover 2 to rotate to adjust the position of the block 22 relative to the notch 71 on the connecting ring plate 7 to control the connection relationship between the discharge cover 2 and the discharge cylinder 1.

[0040] The working principle of the utility model is as follows: the driving cylinder 33 works to drive the lifting plate 32 to move downward, so that the discharge cover 2 moves downward synchronously. At the same time, the driving motor 35 works to drive the discharge cover 2 to rotate, so that the block 22 on the discharge cover 2 corresponds to the position of the notch 71 on the connecting ring plate 7. When the bottom of the discharge cover 2 abuts against the upper end surface of the connecting ring plate 7, the sealing retaining ring 23 abuts against the inner wall of the discharge tube 1, and the sealing gasket 24 elastically deforms. The sealing gasket 24 abuts between the discharge cover 2 and the connecting ring plate 7. At this time, the driving motor 35 drives the discharge cover 2 to rotate, so that the block 22 on the discharge cover 2 rotates relative to the notch 71, so that the block 22 abuts against the lower end surface of the connecting ring plate 7, thereby fixing the discharge cover 2 with the discharge tube 1, and the discharge cover 2 seals the discharge outlet of the discharge tube 1; the smoke flowing out of the secondary combustion chamber emergency discharge chimney 100 After entering the connecting section 4, it reaches the diffusion section 5. As the diameter of the diffusion section 5 continues to increase, the flow rate of the flue gas gradually decreases, so that the kinetic energy of the flue gas at the outlet section 6 is reduced, and the impact force of the flue gas when the cover is opened is weakened, thereby improving the safety performance; when the air pressure in the secondary combustion chamber is too high, the pressure relief valve 81 is opened, and part of the pressure is released through the pressure relief channel 8, so as to further reduce the impact force of the airflow when the cover is opened; when the pressure reaches a certain value, the driving motor 35 drives the discharge cover 2 to rotate, so that the block 22 on the discharge cover 2 reaches the position of the notch 71 on the connecting ring plate 7, and the driving cylinder 33 works, driving the lifting plate 32 to move upward, so that the discharge cover 2 moves upward synchronously, and the discharge cover 2 is separated from the discharge tube 1, and the discharge cover 2 opens the discharge outlet of the discharge tube 1 for emergency discharge; when the air pressure in the secondary combustion chamber is at a normal working value, the discharge cover 2 is closed and the pressure relief valve 81 is closed, and the secondary combustion chamber continues to work.

[0041] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific 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 in the protection scope of the present invention.

Claims

1. An emergency discharge mechanism for a secondary combustion chamber of a rotary kiln, comprising a discharge tube (1) mounted on the top of an emergency discharge chimney (100) of the secondary combustion chamber, characterized in that: The discharge cylinder (1) comprises a connecting section (4), a diffusion section (5) and an outlet section (6); the connecting section (4) and the outlet section (6) are both cylindrical, and the diameter of the outlet section (6) is larger than the diameter of the connecting section (4); the diffusion section (5) is fixedly connected between the connecting section (4) and the outlet section (6), so that the diffusion section (5) forms a trumpet-shaped structure with a thick top and a thin bottom; a discharge cover (2) is provided at the outlet section (6); the discharge cover (2) can rotate around the axis of the discharge cylinder (1), and the discharge cover (2) can move up and down relative to the discharge cylinder (1); a pressure relief channel (8) is provided on the discharge cover (2); and a driving device (3) for driving the discharge cover (2) to move is fixedly installed on the discharge cylinder (1).

2. The emergency discharge mechanism for the secondary combustion chamber of a rotary kiln according to claim 1, characterized in that: A connecting ring plate (7) is fixedly provided at the upper end of the outlet section (6), and two opposite notches (71) are formed on the connecting ring plate (7).

3. The emergency discharge mechanism for the secondary combustion chamber of a rotary kiln according to claim 2, characterized in that: The edge of the discharge cover (2) extends downward to form an annular flange (21), and two clamping blocks (22) are fixedly provided on the annular flange (21). The width of the clamping blocks (22) is slightly smaller than the width of the notch (71), so that the clamping blocks (22) can pass through the notch (71) on the connecting ring plate (7).

4. The emergency discharge mechanism for the secondary combustion chamber of a rotary kiln according to claim 3, characterized in that: A sealing baffle ring (23) is fixedly provided on the discharge cover (2), and the sealing baffle ring (23) is located on the inner side of the annular flange (21).

5. The emergency discharge mechanism for the secondary combustion chamber of a rotary kiln according to claim 4, characterized in that: A sealing gasket (24) is fixedly provided between the sealing retaining ring (23) and the annular flange (21), and the sealing gasket (24) is made of high temperature resistant rubber.

6. The emergency discharge mechanism for the secondary combustion chamber of a rotary kiln according to claim 1, characterized in that: The pressure relief passage (8) is provided with a pressure relief valve (81).

7. The emergency discharge mechanism for the secondary combustion chamber of a rotary kiln according to claim 1, characterized in that: The driving device (3) comprises a mounting plate (31), a lifting plate (32), a driving cylinder (33) and a mounting frame (34); the mounting plate (31) is fixedly mounted on the outer wall of the diffusion section (5) of the discharge cylinder (1); the cylinder body of the driving cylinder (33) is fixedly mounted on the mounting plate (31); the gas rod of the driving cylinder (33) is fixedly connected to the lifting plate (32); and the mounting frame (34) is fixedly mounted below the lifting plate (32).

8. The emergency discharge mechanism for the secondary combustion chamber of a rotary kiln according to claim 7, characterized in that: The driving device (3) further comprises a driving motor (35), wherein the driving motor (35) is fixedly mounted on a mounting frame (34), an output shaft of the driving motor (35) passes through the mounting frame (34) and is fixedly connected to the discharge cover (2), and the output shaft of the driving motor (35) is rotatable relative to the mounting frame (34).

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