Coal falling opening of circulating fluidized bed boiler

Abstract

The utility model relates to the technical field of circulating fluidized bed boilers, and discloses a coal falling opening of a circulating fluidized bed boiler. The crushing box is connected with the output end of the coal feeder, a crushing device and an inclined screen are installed in the crushing box, the screen is located below the crushing device, the side wall of the crushing box is connected with a lifting pipe, a lifting device is arranged in the lifting pipe, and the lifting device is used for lifting coal briquettes screened out by the screen to the position above the crushing device; the lower end of the crushing box is connected with the middle part of the coal falling pipe; the feeding air pipe and the coal spreading air pipe are connected with the coal dropping pipe, and the feeding air pipe and the coal spreading air pipe are connected with the upper end and the lower end of the coal dropping pipe respectively. Crushed coal briquettes are screened through the screen, and coal briquettes which are not thoroughly crushed are subjected to secondary crushing, so that the phenomenon that large coal briquettes fall into the coal falling pipe, and consequently the coal falling pipe is blocked is reduced.

Description

Technical Field

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

[0002] The circulating fluidized bed boiler is a new type of industrial boiler with high efficiency and low pollution. It has the advantages of wide fuel adaptability, high combustion efficiency, efficient desulfurization and low nitrogen oxide emissions, high combustion intensity, good load regulation performance and easy comprehensive utilization of ash.

[0003] During the coal feeding process, when the moisture content of the coal is high (over 10%), the raw coal becomes stickier and less fluid. When feeding through the coal drop pipe, a large amount of coal is squeezed together, which can easily cause the coal to agglomerate in the coal drop pipe under the pressure, leading to blockage of the coal drop pipe.

[0004] Patent publication number CN219120552U discloses a coal outlet for a circulating fluidized bed boiler. This patent utilizes a crushing mechanism that, driven by a drive mechanism, drives the rotation of crushing blades on a crushing shaft. The crushing blades break up coal agglomerates, preventing blockage of the coal inlet pipe by coal lumps, ensuring sufficient fuel in the furnace, and improving furnace efficiency.

[0005] Typically, the coal drop pipe uses specifications such as DN250mm and DN300mm, which are usually small in diameter. In the above-mentioned patent, after the coal lumps are crushed by the crushing blades, they are not screened by the screen. If the crushing is not complete, the incompletely crushed coal lumps will still cause the coal drop pipe to clog. Utility Model Content

[0006] In order to overcome the above-mentioned shortcomings, the utility model aims to provide a coal drop port for a circulating fluidized bed boiler, which uses a screen to screen the crushed coal blocks and performs secondary crushing on the coal blocks that are not completely crushed, so as to reduce the risk of larger coal blocks falling into the coal drop pipe and causing blockage of the coal drop pipe.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is:

[0008] A circulating fluidized bed boiler coal outlet, comprising:

[0009] Coal feeder;

[0010] A crushing box connected to the output end of the coal feeder, wherein a crushing device and an inclined screen are installed in the crushing box, and the screen is located below the crushing device. A lifting pipe is connected to the side wall of the crushing box, and a lifting device is provided in the lifting pipe. The lifting device is used to lift the coal blocks screened by the screen to above the crushing device;

[0011] A coal drop pipe is arranged obliquely and connected to the lower end of the crushing box, and the lower end of the crushing box is connected to the middle of the coal drop pipe; and

[0012] A feeding air duct and a coal spreading air duct are connected to the coal dropping pipe, and the feeding air duct and the coal spreading air duct are respectively connected to the upper end and the lower end of the coal dropping pipe.

[0013] Furthermore, the crushing device includes:

[0014] two crushing wheels arranged side by side and rotatably connected to the interior of the crushing box; and

[0015] A first power member is used to drive the two crushing wheels to rotate.

[0016] Furthermore, the rotating shafts of the two crushing wheels pass through the side walls of the crushing box and are respectively keyed to a driving gear and a driven gear, the driving gear is meshed with the driven gear, and the rotating shaft keyed to the driving gear is coaxially fixedly connected to a first pulley;

[0017] The first power member includes a first motor fixedly connected to the outer side wall of the crushing box, the output shaft of the first motor is coaxially fixedly connected to a second pulley, and the second pulley is transmission-connected to the first pulley via a first belt.

[0018] Furthermore, the lower end of the screen is hinged to the inner side wall of the crushing box, and a stop block is fixedly connected to the inner side wall of the crushing box below the crushing wheel, and the stop block is provided with an arc surface, and the arc surface is slidably connected to the upper end of the screen;

[0019] The screen is connected to a vibration device, and the vibration device is used to drive the screen to vibrate.

[0020] Furthermore, the vibration device includes:

[0021] A shell fixedly connected to the inner wall of the crushing box, wherein the shell is located below the screen;

[0022] A support rod is vertically slidably connected to the upper surface of the housing, the upper end of the support rod is slidably connected to the middle portion of the lower surface of the screen, and the lower end of the support rod is rotatably connected to a roller;

[0023] a cam located below the roller and rotatably connected to the housing, the cam being slidably connected to the roller; and

[0024] A second power member is used to drive the cam to rotate.

[0025] Furthermore, the second power member includes:

[0026] The rotating shaft of the cam passes through the side wall of the crushing box and is spline-connected to the third pulley; and

[0027] A second belt is used, and one of the first pulley and the second pulley is connected to the third pulley through the second belt.

[0028] Furthermore, it also includes:

[0029] One end of a first connecting pipe and one end of a second connecting pipe are connected to the side wall of the crushing box, the connection between the first connecting pipe and the crushing box is located above the crushing wheel, the connection between the second connecting pipe and the crushing box is arranged opposite to the lower end of the screen, and the upper and lower side walls of the lifting pipe are respectively connected to the other ends of the first connecting pipe and the other ends of the second connecting pipe;

[0030] The lifting device comprises:

[0031] rotating an auger connected to the riser; and

[0032] A second motor is fixedly connected to the outer side wall of the lifting tube, and the output shaft of the second motor is transmission-connected to the auger rotating shaft through a coupling.

[0033] Furthermore, a first manual stop door is provided in the middle of the material feeding air duct, and a second manual stop door is provided in the middle of the coal spreading air duct.

[0034] Furthermore, it also includes:

[0035] A feeding air baffle is installed on the inner wall of the coal dropping pipe. The feeding air baffle faces the output end of the feeding air duct and is parallel to the axial direction of the coal dropping pipe.

[0036] Furthermore, the lower end of the crushing box is connected to the upper end of the connecting pipe through a reducing pipe, and the lower end of the connecting pipe is connected to the coal dropping pipe.

[0037] Compared with the prior art, the present invention has at least the following advantages:

[0038] This utility model utilizes a pulverizing device within a pulverizing box to pulverize large, agglomerated coal with high moisture content into small pieces. Large, incompletely pulverized pieces are removed through a screen and returned to the upper portion of the pulverizing device via a lifting pipe and lifting device for secondary pulverization, thereby ensuring that only small pieces of coal enter the coal drop pipe. Feeding air and coal spreading air are respectively delivered to the coal drop pipe through a feed air duct and a coal spreading air duct, thereby conveying the raw coal in the coal drop pipe to the furnace of a circulating fluidized bed boiler.

[0039] Through the above-mentioned method, the utility model can prevent large pieces of coal from falling into the coal drop pipe, effectively reducing the risk of blockage of the coal drop pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 This is a schematic diagram of the overall structure of the coal outlet of a circulating fluidized bed boiler of the present invention;

[0042] Figure 2 For this utility model Figure 1 A partial enlarged view of area A in the middle;

[0043] Figure 3 For this utility model Figure 1 A partial enlarged view of area B in the middle.

[0044] Figure numerals: 1. Coal feeder; 2. Crushing box; 3. Crushing wheel; 4. Driving gear; 5. Driven gear; 6. First pulley; 7. First motor; 8. Second pulley; 9. First belt; 10. Screen; 11. Stop block; 12. First connecting pipe; 13. Second connecting pipe; 14. Lifting pipe; 15. Auger; 16. Second motor; 17. Coal drop pipe; 18. Feed air duct; 19. Feed air baffle; 20. First manual shut-off door; 21. Coal spreading air duct; 22. Second manual shut-off door; 23. Shell; 24. Support rod; 25. Roller; 26. Cam; 27. Third pulley; 28. Second belt; 29. ​​Reducer; 30. Connecting pipe. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0047] Reference Figure 1-3 The utility model provides a coal drop port for a circulating fluidized bed boiler, comprising a coal feeder 1, a crushing box 2, a crushing device, a screen 10, a lifting pipe 14, a lifting device, a coal drop pipe 17, a feeding air duct 18 and a coal spreading air duct 21.

[0048] The input end of the coal feeder 1 is connected to the coal bunker, and the output end of the coal feeder 1 is connected to the crushing box 2. The coal feeder 1 can transport coal from the coal bunker into the crushing box 2. The crushing box 2 is equipped with a crushing device and an inclined screen 10, which is located below the crushing device. A lifting pipe 14 is connected to the side wall of the crushing box 2, and a lifting device is installed in the lifting pipe 14. The lifting device is used to lift the coal lumps screened by the screen 10 to the top of the crushing device. The crushing device is used to crush large lumps of coal that have agglomerated due to high moisture content into small lumps. The screen 10 is provided with mesh holes, allowing small lumps of coal to pass through the mesh holes. Large lumps of coal that are not completely crushed will remain on the screen 10 and be returned to the top of the crushing device through the lifting device in the lifting pipe 14 for secondary crushing. The coal drop pipe 17 is arranged at an angle, and the lower end of the crushing box 2 is connected to the middle of the coal drop pipe 17. The output end of the coal drop pipe 17 is connected to the furnace chamber. To prevent clogging in the coal drop pipe 17, a feed air duct 18 and a coal spreading air duct 21 are connected to the upper and lower ends of the coal drop pipe 17, respectively. The feed air is supplied by the feed air duct, and the coal spreading air is supplied by the coal spreading air duct 21, thereby transporting the raw coal from the coal drop pipe 17 to the furnace of the circulating fluidized bed boiler.

[0049] Preferably, the lower end of the crushing box 2 is connected to a connecting pipe 30 via a reducing pipe 29 , and the lower end of the connecting pipe 30 is connected to the coal dropping pipe 17 .

[0050] Preferably, the crushing device includes a crushing wheel 3 and a first power member. There are two crushing wheels 3, which are rotatably connected to the inside of the crushing box 2 and cooperate with each other to crush the coal blocks. Figure 2 The left crushing wheel 3 rotates clockwise, and the right crushing wheel 3 rotates counterclockwise, thereby crushing the coal blocks. The first power member is used to drive the two crushing wheels 3 to rotate.

[0051] Specifically, the rotating shafts of the two pulverizing wheels 3 pass through the side walls of the pulverizing box 2 and are respectively keyed to a driving gear 4 and a driven gear 5. The driving gear 4 meshes with the driven gear 5, and the rotating shaft keyed to the driving gear 4 is coaxially fixedly connected to a first pulley 6. The first power member is a first motor 7 fixedly connected to the outer wall of the pulverizing box 2. The output shaft of the first motor 7 is coaxially fixedly connected to a second pulley 8, which is in transmission connection with the first pulley 6 via a first belt 9.

[0052] Optionally, the lower end of the screen 10 is hinged to the inner wall of the crushing box 2. A stopper 11 is fixedly connected to the inner wall of the crushing box 2 below the crushing wheel 3. The side of the stopper 11 facing away from the inner wall of the crushing box 2 is provided with a curved surface that is slidably connected to the upper end of the screen 10. The screen 10 is connected to a vibration device that is used to vibrate the screen 10. The provision of this vibration device helps large lumps of coal screened by the screen 10 slide along the screen 10 and enter the riser 14.

[0053] The vibration device includes a housing 23, a support rod 24, a cam 26, and a second power member. The housing 23 is fixedly connected to the inner wall of the crushing chamber 2 and is positioned below the screen 10. The support rod 24 vertically slides through the upper end of the housing 23. The upper end of the support rod 24 is slidably connected to the middle portion of the lower surface of the screen 10. The lower end of the support rod 24 is fixedly connected to a mounting base, within which a roller 25 is rotatably connected. The cam 26 is positioned below the roller 25 and is rotationally connected within the housing 23. The cam 26 is slidably connected to the roller 25. The second power member is used to drive the cam 26 in rotation.

[0054] Preferably, the second power member includes a third pulley 27 and a second belt 28 , wherein the rotating shaft of the cam 26 passes through the side wall of the crushing box 2 and is coaxially fixedly connected to the third pulley 27 , and the first pulley 6 is connected to the third pulley 27 via the second belt 28 .

[0055] The first motor 7 is activated, driving the second pulley 8 to rotate. The second pulley 8 transmits power to the rotating shaft of the crushing wheel 3 via the first belt 9. The driving gear 4 meshes with the driven gear 5, driving the two crushing wheels 3 to operate and crush the coal. Simultaneously, the first pulley 6 drives the third pulley 27 via the second belt 28, which in turn rotates the cam 26, causing the support rod 24 to slide up and down, thereby causing the screen 10 to vibrate up and down, helping the coal on the upper surface of the screen 10 to slide along its tilt.

[0056] The present invention also includes a first connecting pipe 12 and a second connecting pipe 13. The first connecting pipe 12 is located above the second connecting pipe 13. Its ends are connected to the side walls of the crushing box 2 and the side walls of the riser 14, respectively. The second connecting pipe 13 is connected to the side walls of the crushing box 2 and the side walls of the riser 14, respectively. The connection between the first connecting pipe 12 and the crushing box 2 is located above the crushing device, while the connection between the second connecting pipe 13 and the crushing box 2 is located opposite the lower end of the screen 10.

[0057] The lifting device includes an auger 15 and a second motor 16. The auger 15 is rotatably connected to the lifting tube 14. The second motor 16 is fixedly connected to the outer wall of the lifting tube 14. The output shaft of the second motor 16 is connected to the rotating shaft of the auger 15 via a coupling (not shown). When the second motor 16 is activated, it can drive the auger 15 to rotate.

[0058] In a specific embodiment of the present invention, the first motor 7 and the second motor 16 are reduction motors, which have the characteristics of low speed and high torque.

[0059] In order to facilitate the control of the air delivery volume of the feeding air duct 18 and the coal spreading air duct 21 , a first manual stop door 20 is provided in the middle of the feeding air duct 18 , and a second manual stop door 22 is provided in the middle of the coal spreading air duct 21 .

[0060] The utility model also includes a feed air baffle 19. This baffle 19 is mounted on the inner wall of the coal drop pipe 17, facing the output end of the feed air duct 18 and parallel to the axis of the coal drop pipe 17. The installation of the baffle 19 redirects the feed air flow, directing it downward along the coal drop pipe 17. This ensures that the feed air is fully directed in the direction of the coal flow, thereby increasing the utilization rate of the feed air.

[0061] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0062] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements to the technical solutions of the present invention made by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A circulating fluidized bed boiler coal outlet, characterized in that: include: Coal feeder (1); A crushing box (2) connected to the output end of the coal feeder (1), wherein a crushing device and an inclined screen (10) are installed in the crushing box (2), wherein the screen (10) is located below the crushing device, and a lifting pipe (14) is connected to the side wall of the crushing box (2), wherein a lifting device is provided in the lifting pipe (14), and the lifting device is used to lift the coal blocks screened by the screen (10) to above the crushing device; A coal drop pipe (17) is arranged obliquely and connected to the lower end of the crushing box (2), and the lower end of the crushing box (2) is connected to the middle of the coal drop pipe (17); and A feeding air duct (18) and a coal spreading air duct (21) are connected to the coal dropping pipe (17); the feeding air duct (18) and the coal spreading air duct (21) are respectively connected to the upper end and the lower end of the coal dropping pipe (17).

2. The coal outlet of a circulating fluidized bed boiler according to claim 1, characterized in that: The pulverizing device comprises: Two crushing wheels (3) arranged side by side and rotatably connected to the inside of the crushing box (2); and A first power member is used for driving the two crushing wheels (3) to rotate.

3. The coal outlet of a circulating fluidized bed boiler according to claim 2, characterized in that: The rotating shafts of the two crushing wheels (3) pass through the side walls of the crushing box (2) and are respectively connected to a driving gear (4) and a driven gear (5) by a key. The driving gear (4) is meshed with the driven gear (5). The rotating shaft connected to the driving gear (4) by a key is coaxially fixedly connected to a first pulley (6). The first power member comprises a first motor (7) fixedly connected to the outer wall of the crushing box (2); the output shaft of the first motor (7) is coaxially fixedly connected to a second pulley (8); and the second pulley (8) is connected to the first pulley (6) through a first belt (9).

4. The coal drop port of a circulating fluidized bed boiler according to claim 3, characterized in that: The lower end of the screen (10) is hinged to the inner side wall of the crushing box (2), and a stop block (11) is fixedly connected to the inner side wall of the crushing box (2) below the crushing wheel (3), and the stop block (11) is provided with an arc surface, and the arc surface is slidably connected to the upper end of the screen (10); The screen (10) is connected to a vibration device, and the vibration device is used to drive the screen (10) to vibrate.

5. The coal drop port of a circulating fluidized bed boiler according to claim 4, characterized in that: The vibration device comprises: A shell (23) fixedly connected to the inner wall of the crushing box (2), wherein the shell (23) is located below the screen (10); A support rod (24) is slidably connected to the upper surface of the housing (23) in a vertical direction, wherein the upper end of the support rod (24) is slidably connected to the middle portion of the lower surface of the screen (10), and the lower end of the support rod (24) is rotatably connected to a roller (25); a cam (26) located below the roller (25) and rotatably connected to the housing (23), wherein the cam (26) is slidably connected to the roller (25); and A second power member is used for driving the cam (26) to rotate.

6. The coal drop port of a circulating fluidized bed boiler according to claim 5, characterized in that: The second power member includes: The rotating shaft of the cam (26) passes through the side wall of the crushing box (2) and is spline-connected to a third pulley (27); and A second belt (28), one of the first pulley (6) and the second pulley (8) is connected to the third pulley (27) through the second belt (28).

7. The coal drop port of a circulating fluidized bed boiler according to claim 6, characterized in that: Also includes: One end of a first connecting pipe (12) and one end of a second connecting pipe (13) connected to the side wall of the crushing box (2), the connection between the first connecting pipe (12) and the crushing box (2) is located above the crushing wheel (3), the connection between the second connecting pipe (13) and the crushing box (2) and the lower end of the screen (10) are arranged opposite each other, and the upper and lower side walls of the lifting pipe (14) are respectively connected to the other end of the first connecting pipe (12) and the other end of the second connecting pipe (13); The lifting device comprises: Rotating an auger (15) connected to the lifting pipe (14); as well as A second motor (16) is fixedly connected to the outer side wall of the lifting tube (14), and the output shaft of the second motor (16) is transmission-connected to the rotating shaft of the auger (15) through a coupling.

8. The coal drop port of a circulating fluidized bed boiler according to claim 1, characterized in that: A first manual stop door (20) is provided in the middle of the material feeding air duct (18), and a second manual stop door (22) is provided in the middle of the coal spreading air duct (21).

9. The coal drop port of a circulating fluidized bed boiler according to claim 1, characterized in that: Also includes: A feeding air baffle (19) is installed on the inner wall of the coal dropping pipe (17), the feeding air baffle (19) faces the output end of the feeding air pipe (18), and the feeding air baffle (19) is parallel to the axial direction of the coal dropping pipe (17).

10. The coal drop port of a circulating fluidized bed boiler according to claim 1, characterized in that: The lower end of the crushing box (2) is connected to the upper end of a connecting pipe (30) via a reducing pipe (29), and the lower end of the connecting pipe (30) is connected to the coal dropping pipe (17).

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