Secondary air control system of turbulent burner

Abstract

The secondary air control system comprises the turbulent burner and an air bellow, the turbulent burner is installed in the air bellow, guide rails are arranged on the two sides of the turbulent burner, an annular baffle is arranged at a secondary air opening of the turbulent burner in a sleeved mode, the annular baffle is installed between the guide rails in a sliding mode, and a rotating rod is installed on the front wall of the air bellow in a penetrating mode. Swing rods are arranged on the front sides of the two ends of the connecting rod, the ends, away from the connecting rod, of the swing rods are hinged to one end of a connecting rod, the other end of the connecting rod is connected with one end of a crank arm, and the other end of the crank arm is connected with a sliding rod; the sliding rod is connected with the annular baffle. Even if installation errors, thermal expansion dislocation and the like exist between devices, the problem of adjustment jamming cannot be generated, and it can be guaranteed that secondary air volumes of combustors on the same layer are balanced or the requirement for low-nitrogen combustion can be met.

Description

Technical Field

[0001] The utility model relates to a secondary air control system for a swirl burner, belonging to the technical field of burners. Background Art

[0002] Swirl burners are widely used in large-capacity power station boilers with front and rear wall counter-combustion. Currently, most low-nitrogen swirl burners use blades to adjust the rotation and annular baffles to adjust the air volume. The total secondary air volume is controlled by adjusting the damper opening on both sides of each layer of secondary air box.

[0003] In existing technology, the secondary air volume of a swirl burner is manually adjusted on-site. An annular baffle is connected to two or three tie rods, which are used to adjust the baffle's position from the outside of the secondary air box. Due to issues with tie rod installation quality, uneven expansion at high temperatures, and dust accumulation within the sealing sleeve, the tie rods can become stuck, making adjustment difficult.

[0004] When a boiler with front and rear wall counter-combustion operates under low nitrogen air supply or low load, the pressure in the secondary air box is relatively low, or even negative pressure. In this case, the air volume of each burner on the same layer will have a large deviation, and parameters such as furnace temperature, flue gas volume, NOx, and fly ash carbon content will also become uneven. Utility Model Content

[0005] The purpose of the utility model is to provide a secondary air control system for a swirl burner, which can effectively avoid the problem of pull rod sticking, and at the same time ensure that the secondary air volume of each burner on the same layer is balanced or meet the needs of low-nitrogen combustion.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: a swirl burner secondary air control system, comprising a swirl burner and a bellows, the swirl burner is installed in the bellows, guide rails are provided on both sides of the swirl burner, and the guide rails can also be installed on the side walls of the bellows, an annular baffle is sleeved at the secondary air port of the swirl burner, the annular baffle is slidably installed between the guide rails, the annular baffle can slide back and forth along the guide rails, thereby adjusting the secondary air volume, a rotating rod is installed through the front wall of the bellows, one end of the outer side of the rotating rod is connected to one end of a handle, and rotating the handle can drive the rotating rod to rotate, and the other end of the rotating rod passes through the bellows through a universal joint A connecting rod is connected to change the left and right rotation into up and down rotation. A universal joint is used, so even if there are installation errors, thermal expansion dislocations, etc. between the equipment, there will be no adjustment jamming problems. A rocker arm is provided on the front sides of both ends of the connecting rod, and the end of the rocker arm away from the connecting rod is hinged to one end of the connecting rod. The rotation of the connecting rod can drive the connecting rod to move up and down through the rocker arm, and the other end of the connecting rod is connected to one end of a crank arm, and the other end of the crank arm is connected to a sliding rod. The sliding rod is connected to the annular baffle, and the crank arm can be rotatably installed along the center part on the side of the swirl burner. The up and down movement of the connecting rod can rotate the crank arm, and the rotation of the crank arm can drive the annular baffle to move back and forth through the sliding rod, thereby adjusting the secondary air volume.

[0007] The aforementioned swirl burner secondary air control system has a V-shaped slideway in the middle of the guide rail, sliders are provided on both sides of the annular baffle, the ends of the slide rods are connected to the sliders, and the sides of the sliders are provided with V-shaped grooves. The sliders are slidably installed on the V-shaped slideway through the V-shaped grooves. The structure of the sliders and guide rails can ensure the smooth forward and backward movement of the annular baffle, the V-shaped slideway and the V-shaped groove prevent the baffle from being misplaced, and there will be no jamming between the slider and the V-shaped slideway due to dust accumulation.

[0008] The aforementioned secondary air control system of a swirl burner has a pneumatic actuator fixed on the outer side of the front wall of the wind box, and the output end of the pneumatic actuator is connected to the end of the vertically arranged handle away from the rotating rod. The output end of the pneumatic actuator can drive the handle to rotate, replacing manual operation.

[0009] In the aforementioned secondary air control system for a swirl burner, the pneumatic actuator is connected to an external control system, and the external control system can be adjusted and operated through intelligent automatic control.

[0010] In the aforementioned secondary air control system for a swirl burner, the rotating rod and the connecting rod are both suspended on the top of the wind box through the support rod, and the rotating rod and the connecting rod are both rotatably arranged at the bottom of the support rod in the horizontal direction.

[0011] In the aforementioned secondary air control system of a swirl burner, a sealing sleeve is provided on the outer side of the front wall of the wind box, and the sealing sleeve is sleeved on the rotating rod to prevent air leakage between the rotating rod and the outer wall of the wind box.

[0012] Compared with the prior art, the present invention adopts a rotary adjustment mechanism to replace the push-pull rod adjustment mechanism. Even if there are installation errors, thermal expansion dislocations, etc. between the equipment, there will be no adjustment jamming problem. It will also not be jammed due to dust accumulation, effectively avoiding the problem of pull rod jamming. The dampers on both sides of the secondary air box of the present invention only adjust the pressure of the air box. During operation, the secondary air box maintains an appropriate pressure, and a pneumatic actuator is used to adjust the secondary air volume of the swirl burner to ensure that the secondary air volume of each burner on the same layer is balanced or meets the needs of low-nitrogen combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 It is a schematic diagram of the guide rail and slider installation structure of the utility model.

[0015] Figure numerals: 1-swirl burner, 2-bellows, 3-guide rail, 4-annular baffle, 5-pneumatic actuator, 6-handle, 7-rotating rod, 8-connecting rod, 9-rocker arm, 10-connecting rod, 11-slide rod, 12-V-shaped slide, 13-universal joint, 14-support rod, 15-sealing sleeve, 16-slider, 17-crank arm.

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0017] Embodiment 1 of the present utility model: A secondary air control system for a swirl burner, comprising a swirl burner 1 and a wind box 2, wherein the swirl burner 1 is installed in the wind box 2, and guide rails 3 are provided on both sides of the swirl burner 1, and the guide rails 3 can also be installed on the side walls of the wind box 2 on both sides, and an annular baffle 4 is sleeved at the secondary air port of the swirl burner 1, and the annular baffle 4 is slidably installed between the guide rails 3, and the annular baffle 4 can slide back and forth along the guide rails 3 to adjust the secondary air volume, and a rotating rod 7 is installed through the front wall of the wind box 2, and one end of the outer side of the rotating rod 7 is connected to one end of a handle 6, and rotating the handle 6 can drive the rotating rod 7 to rotate, and the other end of the rotating rod 7 passes through the wind box 2 and is connected to a connecting rod 8 through a universal joint 13, so that the left and right rotation changes In order to rotate up and down, a universal joint 13 is used. Even if there are installation errors, thermal expansion dislocations, etc. between the equipment, there will be no adjustment jamming problems. A rocker arm 9 is provided on the front side of both ends of the connecting rod 8. The end of the rocker arm 9 away from the connecting rod 8 is hinged to one end of the connecting rod 10. The rotation of the connecting rod 8 can drive the connecting rod 10 to move up and down through the rocker arm 9. The other end of the connecting rod 10 is connected to one end of a crank arm 17, and the other end of the crank arm 17 is connected to a slide rod 11. The slide rod 11 is connected to the annular baffle 4, and the crank arm 17 can be rotatably installed along the center part on the side of the swirl burner 1. The up and down movement of the connecting rod 10 can rotate the crank arm 17. The rotation of the crank arm 17 can drive the annular baffle 4 to move back and forth through the slide rod 11, thereby adjusting the secondary air volume.

[0018] Embodiment 2 of the present utility model: A secondary air control system for a swirl burner, comprising a swirl burner 1 and a wind box 2, wherein the swirl burner 1 is installed in the wind box 2, and guide rails 3 are provided on both sides of the swirl burner 1, and the guide rails 3 can also be installed on the side walls of the wind box 2 on both sides, and an annular baffle 4 is sleeved at the secondary air port of the swirl burner 1, and the annular baffle 4 is slidably installed between the guide rails 3, and the annular baffle 4 can slide back and forth along the guide rails 3, thereby adjusting the secondary air volume, and a rotating rod 7 is installed through the front wall of the wind box 2, and one end of the outer side of the rotating rod 7 is connected to one end of a handle 6, and rotating the handle 6 can drive the rotating rod 7 to rotate, and the other end of the rotating rod 7 passes through the wind box 2 and is connected to a connecting rod 8 through a universal joint 13, so that the left and right rotation changes In order to rotate up and down, a universal joint 13 is used. Even if there are installation errors, thermal expansion dislocations, etc. between the equipment, there will be no adjustment jamming problems. A rocker arm 9 is provided on the front side of both ends of the connecting rod 8. The end of the rocker arm 9 away from the connecting rod 8 is hinged to one end of the connecting rod 10. The rotation of the connecting rod 8 can drive the connecting rod 10 to move up and down through the rocker arm 9. The other end of the connecting rod 10 is connected to one end of a crank arm 17, and the other end of the crank arm 17 is connected to a slide rod 11. The slide rod 11 is connected to the annular baffle 4, and the crank arm 17 can be rotatably installed along the center part on the side of the swirl burner 1. The up and down movement of the connecting rod 10 can rotate the crank arm 17. The rotation of the crank arm 17 can drive the annular baffle 4 to move back and forth through the slide rod 11, thereby adjusting the secondary air volume.

[0019] A V-shaped slide 12 is provided in the middle of the guide rail 3, and sliders 16 are provided on both sides of the annular baffle 4. The end of the slide rod 11 is connected to the slider 16, and a V-shaped groove is provided on the side of the slider 16. The slider 16 is slidably installed on the V-shaped slide 12 through the V-shaped groove. The structure of the slider 16 and the guide rail 3 can ensure that the annular baffle 4 can move back and forth smoothly. The V-shaped slide 12 and the V-shaped groove prevent the baffle 4 from being misplaced, and there will be no jamming between the slider 16 and the V-shaped slide 12 due to dust accumulation.

[0020] Embodiment 3 of the present utility model: A secondary air control system for a swirl burner, comprising a swirl burner 1 and a wind box 2, wherein the swirl burner 1 is installed in the wind box 2, and guide rails 3 are provided on both sides of the swirl burner 1, and the guide rails 3 can also be installed on the side walls of the wind box 2, and an annular baffle 4 is sleeved at the secondary air port of the swirl burner 1, and the annular baffle 4 is slidably installed between the guide rails 3, and the annular baffle 4 can slide back and forth along the guide rails 3, thereby adjusting the secondary air volume, and a rotating rod 7 is installed through the front wall of the wind box 2, and one end of the outer side of the rotating rod 7 is connected to one end of a handle 6, and rotating the handle 6 can drive the rotating rod 7 to rotate, and the other end of the rotating rod 7 passes through the wind box 2 and is connected to a connecting rod 8 through a universal joint 13, so that the left and right rotation changes In order to rotate up and down, a universal joint 13 is used. Even if there are installation errors, thermal expansion dislocations, etc. between the equipment, there will be no adjustment jamming problems. A rocker arm 9 is provided on the front side of both ends of the connecting rod 8. The end of the rocker arm 9 away from the connecting rod 8 is hinged to one end of the connecting rod 10. The rotation of the connecting rod 8 can drive the connecting rod 10 to move up and down through the rocker arm 9. The other end of the connecting rod 10 is connected to one end of a crank arm 17, and the other end of the crank arm 17 is connected to a slide rod 11. The slide rod 11 is connected to the annular baffle 4, and the crank arm 17 can be rotatably installed along the center part on the side of the swirl burner 1. The up and down movement of the connecting rod 10 can rotate the crank arm 17. The rotation of the crank arm 17 can drive the annular baffle 4 to move back and forth through the slide rod 11, thereby adjusting the secondary air volume. A pneumatic actuator 5 is fixed to the outside of the front wall of the bellows 2. The output end of the pneumatic actuator 5 is connected to the end of the vertically arranged handle 6 away from the rotating rod 7. The output end of the pneumatic actuator 5 can drive the handle 6 to rotate, replacing manual operation. The pneumatic actuator 5 is connected to an external control system, and the external control system can adjust the operation through intelligent automatic control.

[0021] Embodiment 4 of the present utility model: A secondary air control system for a swirl burner, comprising a swirl burner 1 and a wind box 2, wherein the swirl burner 1 is installed in the wind box 2, and guide rails 3 are provided on both sides of the swirl burner 1, and the guide rails 3 can also be installed on the side walls of the wind box 2, and an annular baffle 4 is sleeved at the secondary air inlet of the swirl burner 1, and the annular baffle 4 is slidably installed between the guide rails 3, and the annular baffle 4 can slide back and forth along the guide rails 3, thereby adjusting the secondary air volume, and a rotating rod 7 is installed through the front wall of the wind box 2, and one end of the outer side of the rotating rod 7 is connected to one end of a handle 6, and rotating the handle 6 can drive the rotating rod 7 to rotate, and the other end of the rotating rod 7 passes through the wind box 2 and is connected to a connecting rod 8 through a universal joint 13, so that the left and right rotation changes In order to rotate up and down, a universal joint 13 is used. Even if there are installation errors, thermal expansion dislocations, etc. between the equipment, there will be no adjustment jamming problems. A rocker arm 9 is provided on the front side of both ends of the connecting rod 8. The end of the rocker arm 9 away from the connecting rod 8 is hinged to one end of the connecting rod 10. The rotation of the connecting rod 8 can drive the connecting rod 10 to move up and down through the rocker arm 9. The other end of the connecting rod 10 is connected to one end of a crank arm 17, and the other end of the crank arm 17 is connected to a slide rod 11. The slide rod 11 is connected to the annular baffle 4, and the crank arm 17 can be rotatably installed along the center part on the side of the swirl burner 1. The up and down movement of the connecting rod 10 can rotate the crank arm 17. The rotation of the crank arm 17 can drive the annular baffle 4 to move back and forth through the slide rod 11, thereby adjusting the secondary air volume.

[0022] The rotating rod 7 and the connecting rod 8 are both suspended on the top of the bellows 2 by a support rod 14, and the rotating rod 7 and the connecting rod 8 are both rotatably arranged horizontally at the bottom of the support rod 14. A sealing sleeve 15 is provided on the outer side of the front wall of the bellows 2, and the sealing sleeve 15 is sleeved on the rotating rod 7 to prevent air leakage between the rotating rod 7 and the outer wall of the bellows 2.

[0023] The working principle of an embodiment of the utility model: When the utility model is in use, the external control system can adjust the operation of the pneumatic actuator 5 through intelligent automatic control. For example, if a DCS control system is used to achieve control, the output end of the pneumatic actuator 5 can drive the handle 6 to rotate, and rotating the handle 6 can drive the rotating rod 7 to rotate. The rotating rod 7 drives the connecting rod 8 to rotate through the universal joint 13, and changes from left and right rotation to up and down rotation. By using the universal joint 13, there will be no adjustment jamming problem even if there are installation errors, thermal expansion dislocations, etc. between the equipment. The connecting rod 8 can drive the connecting rod 10 to move up and down through the rocker arm 9, and the up and down movement of the connecting rod 10 can rotate the crank arm 17. The rotation of the crank arm 17 can drive the annular baffle 4 to move back and forth through the slide rod 11, thereby adjusting the secondary air volume.

Claims

1. A secondary air control system for a swirl burner, comprising a swirl burner (1) and a wind box (2), wherein the swirl burner (1) is installed in the wind box (2), and is characterized in that: Guide rails (3) are provided on both sides of the swirl burner (1). An annular baffle (4) is sleeved at the secondary air inlet of the swirl burner (1). The annular baffle (4) is slidably installed between the guide rails (3). A rotating rod (7) is installed through the front wall of the wind box (2). One end of the outer side of the rotating rod (7) is connected to one end of the handle (6). The other end of the rotating rod (7) passes through the wind box (2) and is connected to a connecting rod (8) through a universal joint (13). A swing rod (9) is provided on the front side of both ends of the connecting rod (8). The end of the swing rod (9) away from the connecting rod (8) is hinged to one end of a connecting rod (10). The other end of the connecting rod (10) is connected to one end of a crank arm (17). The other end of the crank arm (17) is connected to a sliding rod (11). The sliding rod (11) is connected to the annular baffle (4), and the crank arm (17) can be rotatably installed along the center portion on the side of the swirl burner (1).

2. A secondary air control system for a swirl burner according to claim 1, characterized in that: A V-shaped slideway (12) is provided in the middle of the guide rail (3), sliders (16) are provided on both sides of the annular baffle (4), the ends of the slide rod (11) are connected to the sliders (16), and a V-shaped groove is provided on the side of the slider (16), and the slider (16) is slidably installed on the V-shaped slideway (12) through the V-shaped groove.

3. The secondary air control system for a swirl burner according to claim 1, characterized in that: A pneumatic actuator (5) is fixed to the outside of the front wall of the bellows (2), and an output end of the pneumatic actuator (5) is connected to an end of a vertically arranged handle (6) away from the rotating rod (7).

4. A secondary air control system for a swirl burner according to claim 3, characterized in that: The pneumatic actuator (5) is connected to an external control system.

5. The secondary air control system for a swirl burner according to claim 1, characterized in that: The rotating rod (7) and the connecting rod (8) are both suspended on the top of the bellows (2) via a supporting rod (14), and the connecting rod (8) is rotatably arranged at the bottom of the supporting rod (14).

6. The secondary air control system for a swirl burner according to claim 1, characterized in that: A sealing sleeve (15) is provided on the outer side of the front wall of the bellows (2), and the sealing sleeve (15) is sleeved on the rotating rod (7).

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