Circulating fluidized bed boiler stable in operation

Abstract

The utility model discloses a circulating fluidized bed boiler stable in operation, which relates to the technical field of fluidized bed boilers and comprises a boiler body and a return pipe communicated with the outer side of the boiler body, an air distribution plate is arranged at the lower end in the boiler body, a spring is fixedly arranged between the air distribution plate and the bottom of the inner wall of the boiler body, and a cross rod is rotatably arranged at the lower end of the side part of the boiler body in a penetrating manner. A push block is fixedly arranged at the end, close to the air distribution plate, of the transverse rod and matched with the bottom of the air distribution plate, the upper end of the pipe wall of the material returning pipe communicates with a guide cover, and a discharging driving mechanism used for driving is arranged in the guide cover. According to the furnace body, the air distribution plate, the spring, the sliding rod, the sliding groove, the transverse rod, the push block and the material returning pipe, when materials in the material returning pipe enter the furnace body and make contact with the air distribution plate, the air distribution plate can be pushed, the air distribution plate vibrates under continuous springback of the spring, the position of the materials on the surface of the air distribution plate cannot be fixed continuously, and the material returning effect is improved. Therefore, the surface of the air distribution plate is prevented from being blocked as much as possible, and the boiler can continuously and stably operate.

Description

Technical Field

[0001] The utility model relates to the technical field of fluidized bed boilers, in particular to a circulating fluidized bed boiler with stable operation. Background Art

[0002] A circulating fluidized bed boiler is a boiler that uses fluidized combustion. It is mainly composed of a combustion chamber and a circulating furnace. It is one of the important means of clean coal combustion technology.

[0003] After searching, the patent number CN214406031U discloses a circulating fluidized bed boiler. When the material of the boiler passes through the arc structure, it is restricted by the surface of the arc structure and flows out along the tangent direction of the arc structure at the return port. As a result, the material flows in an upward oblique direction when entering the furnace, that is, the material maintains a certain elevation angle when entering the furnace. Then, the material enters the furnace and the fluidized material is thrown up at a certain flow rate and inertia, so that the material does not directly impact the air distribution plate, thereby avoiding the problem of material accumulation on the air distribution plate and causing blockage of the air distribution plate.

[0004] However, the scattering flow of materials requires a large flow rate and impact force when the materials pass through the return pipe, which requires the return pipe to be of sufficient length and contain more materials. When there is less material in the return pipe and the pipe is insufficiently long, the materials will still directly contact the air distribution plate and cause the air distribution plate to be blocked. Utility Model Content

[0005] In view of the above problems existing in the existing circulating fluidized bed boiler with stable operation, the present utility model is proposed.

[0006] Therefore, the purpose of the utility model is to provide a circulating fluidized bed boiler with stable operation, which solves the problem that when there is less material in the return pipe and the pipe length is insufficient, the material flow rate is slow and cannot fall in a throwing state, so that the material still directly contacts the air distribution plate and causes the air distribution plate to be blocked.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A circulating fluidized bed boiler with stable operation, comprising a furnace body and a return pipe connected to the outside of the furnace body, an air distribution plate is arranged at the lower end of the furnace body, a spring is fixed between the air distribution plate and the bottom of the inner wall of the furnace body, a cross bar is rotatably passed through the lower end of the side of the furnace body, a push block is fixed at one end of the cross bar close to the air distribution plate, and the push block is arranged in cooperation with the bottom of the air distribution plate;

[0009] The upper end of the pipe wall of the return pipe is connected to a guide cover, and a material feeding driving mechanism is provided inside the guide cover;

[0010] An intermittent driving mechanism for driving the push block to rotate is arranged at one end of the cross bar away from the air distribution plate.

[0011] Preferably, the unloading drive mechanism includes a rotating rod, which is rotatably arranged in the guide cover, and the rear end passes through the guide cover and extends to the outside. The rod wall fixing sleeve of the rotating rod is provided with a guide impeller, and the wheel blade of the guide impeller passes into the return pipe.

[0012] Preferably, the intermittent drive mechanism includes a vertical rod, a fixed plate is fixedly provided on the upper end of the back side of the return tube, the vertical rod is rotatably arranged in the fixed plate, a first bevel gear is fixedly provided on the top of the vertical rod, a fan-shaped bevel gear is meshed with the first bevel gear, the fan-shaped bevel gear is fixedly connected to the rotating rod, and a second bevel gear is fixedly provided at one end of the vertical rod and the cross rod, and the two second bevel gears are meshed.

[0013] Preferably, the push block is arranged in a cam shape.

[0014] Furthermore, two symmetrically arranged slide grooves are provided at the lower ends of both sides of the inner wall of the furnace body, and slide rods are fixedly penetrated at both ends of the inner part of the air distribution plate, and the ends of the slide rods are slidably arranged in the slide grooves.

[0015] Preferably, the cross bar and the furnace body are rotatably connected by a sealed bearing.

[0016] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0017] 1. The utility model, through the furnace body, air distribution plate, spring, slide bar, slide groove, cross bar, push block and return pipe, can push the air distribution plate when the material in the return pipe enters the furnace body and contacts the air distribution plate, so that the air distribution plate vibrates under the continuous rebound of the spring, making it impossible to continuously fix the position of the material on the surface of the air distribution plate, thereby avoiding blockage of the surface of the air distribution plate as much as possible, so that the boiler can operate continuously and stably.

[0018] 2. The utility model, through the provided return pipe, cross bar, push block, guide cover, unloading drive mechanism and intermittent drive mechanism, can make the air distribution plate be intermittently pushed to produce continuous vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] Figure 2 It is a rear view of the utility model;

[0022] Figure 3 It is a three-dimensional structural schematic diagram of the push block of the utility model.

[0023] Description of reference numerals:

[0024] 1. Furnace body; 2. Return pipe; 3. Air distribution plate; 4. Spring; 5. Cross bar; 6. Push block; 7. Guide cover; 8. Rotating rod; 9. Guide impeller; 10. Vertical rod; 11. Fixed plate; 12. First bevel gear; 13. Fan-shaped bevel gear; 14. Second bevel gear; 15. Slide groove; 16. Slide rod. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] The utility model embodiment discloses a circulating fluidized bed boiler with stable operation.

[0027] The utility model provides Figure 1-3 A circulating fluidized bed boiler with stable operation shown in the figure includes a furnace body 1 and a return pipe 2 connected to the outside of the furnace body 1, and is characterized in that an air distribution plate 3 is provided at the lower end of the interior of the furnace body 1, a spring 4 is fixedly provided between the air distribution plate 3 and the bottom of the inner wall of the furnace body 1, two symmetrically arranged slide grooves 15 are provided at the lower ends of both sides of the inner wall of the furnace body 1, and sliding rods 16 are fixedly penetrated at both ends of the interior of the air distribution plate 3, and the ends of the sliding rods 16 are slidably arranged in the slide grooves 15, a cross bar 5 is rotatably penetrated at the lower end of the side of the furnace body 1, and the cross bar 5 and the furnace body 1 are rotatably connected by sealed bearings, and a push block 6 is fixedly provided at one end of the cross bar 5 close to the air distribution plate 3, and the push block 6 is matched with the bottom of the air distribution plate 3, and the push block 6 is arranged in a cam shape.

[0028] During the use of the boiler, the material enters the furnace body 1 through the return pipe 2 and cooperates with the air distribution plate 3 to be effectively fluidized. When the material enters the furnace body 1 and falls onto the air distribution plate 3, the push block 6 rotates under the intermittent drive of the cross bar 5. When the push block 6 contacts and pushes the air distribution plate 3, the air distribution plate 3 stretches the spring 4 through the sliding cooperation of the slide bar 16 and the slide groove 15. When the push block 6 is separated from the air distribution plate 3, the air distribution plate 3 rebounds under the elastic force recovery of the spring 4. At the same time, the air distribution plate 3 may vibrate due to the continuous rebound vibration of the spring 4, so that the material on the surface of the air distribution plate 3 continues to vibrate and cannot be fixed in position, so that the surface of the air distribution plate 3 cannot be blocked due to the fixed accumulation of materials, so that the material can be continuously and stably fluidized inside the furnace body 1.

[0029] In order to enable the push block 6 to be stably driven, Figure 1-2 As shown, the upper end of the tube wall of the return tube 2 is connected with a guide cover 7, and a material discharge driving mechanism for driving is arranged in the guide cover 7. The material discharge driving mechanism includes a rotating rod 8, which is rotatably arranged in the guide cover 7, and the rear end passes through the guide cover 7 and extends to the outside. A guide impeller 9 is fixedly sleeved on the rod wall of the rotating rod 8, and the wheel blade of the guide impeller 9 passes into the return tube 2;

[0030] An intermittent driving mechanism for driving the push block 6 to rotate is provided at the end of the cross bar 5 away from the air distribution plate 3, and the intermittent driving mechanism includes a vertical rod 10. A fixed plate 11 is fixedly provided at the upper end of the back side of the return pipe 2. The vertical rod 10 is rotatably arranged in the fixed plate 11. A first bevel gear 12 is fixedly provided at the top of the vertical rod 10. A fan-shaped bevel gear 13 is meshed with the first bevel gear 12. The fan-shaped bevel gear 13 is fixedly connected to the rotating rod 8. A second bevel gear 14 is fixedly provided at one end of the vertical rod 10 and the cross bar 5, and the two second bevel gears 14 are meshed.

[0031] Before the material enters the furnace body 1 through the return pipe 2, the material flows inside the return pipe 2. When the material contacts the conductor impeller 9, the conductor impeller 9 is pushed to drive the rotating rod 8 to rotate. At this time, under the meshing of the fan-shaped bevel gear 13 and the first bevel gear 12, the vertical rod 10 can be subjected to intermittent rotation. While the vertical rod 10 rotates, under the meshing of the two second bevel gears 14, the vertical rod 10 can drive the cross rod 5 to rotate synchronously. Since the fan-shaped bevel gear 13 is intermittently meshed with the first bevel gear 12, the vertical rod 10 and the cross rod 5 also rotate intermittently, so that the push block 6 can intermittently push the air distribution plate 3 to ensure that the air distribution plate 3 can prevent the fixed position of the material on its surface from causing blockage while performing stable fluidization work.

[0032] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A circulating fluidized bed boiler with stable operation, comprising a furnace body (1) and a return pipe (2) connected to the outside of the furnace body (1), characterized in that: An air distribution plate (3) is provided at the lower end of the interior of the furnace body (1), a spring (4) is fixedly provided between the air distribution plate (3) and the bottom of the inner wall of the furnace body (1), a cross bar (5) is rotatably passed through the lower end of the side of the furnace body (1), a push block (6) is fixedly provided at one end of the cross bar (5) close to the air distribution plate (3), and the push block (6) is arranged in cooperation with the bottom of the air distribution plate (3); The upper end of the tube wall of the return tube (2) is connected to a guide cover (7), and a material discharge driving mechanism for driving is arranged inside the guide cover (7); An intermittent driving mechanism for driving the push block (6) to rotate is provided at one end of the cross bar (5) away from the air distribution plate (3).

2. The circulating fluidized bed boiler with stable operation according to claim 1, characterized in that: The material unloading driving mechanism comprises a rotating rod (8), the rotating rod (8) is rotatably arranged in the guide cover (7), and the rear end thereof passes through the guide cover (7) and extends to the outside, and a guide impeller (9) is provided on the rod wall fixing sleeve of the rotating rod (8), and the wheel blade of the guide impeller (9) passes into the return pipe (2).

3. The circulating fluidized bed boiler with stable operation according to claim 1, characterized in that: The intermittent drive mechanism comprises a vertical rod (10), a fixed plate (11) is fixedly provided at the upper end of the back side of the return pipe (2), the vertical rod (10) is rotatably arranged in the fixed plate (11), a first bevel gear (12) is fixedly provided at the top of the vertical rod (10), a fan-shaped bevel gear (13) is meshed with the first bevel gear (12), the fan-shaped bevel gear (13) is fixedly sleeved with the rotating rod (8), and a second bevel gear (14) is fixedly provided at one end of the vertical rod (10) and the cross rod (5), and two second bevel gears (14) are meshed.

4. The circulating fluidized bed boiler with stable operation according to claim 1, characterized in that: The push block (6) is arranged in a cam shape.

5. The circulating fluidized bed boiler with stable operation according to claim 1, characterized in that: Two symmetrically arranged slide grooves (15) are provided at the lower ends of both sides of the inner wall of the furnace body (1), and slide rods (16) are fixedly penetrated at both ends of the interior of the air distribution plate (3), and the ends of the slide rods (16) are slidably arranged in the slide grooves (15).

6. The circulating fluidized bed boiler with stable operation according to claim 1, characterized in that: The crossbar (5) and the furnace body (1) are rotatably connected by means of a sealed bearing.

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