CN212481264U - Fluidized bed boiler with fuel screening device - Google Patents
Fluidized bed boiler with fuel screening device Download PDFInfo
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- CN212481264U CN212481264U CN201922099903.0U CN201922099903U CN212481264U CN 212481264 U CN212481264 U CN 212481264U CN 201922099903 U CN201922099903 U CN 201922099903U CN 212481264 U CN212481264 U CN 212481264U
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- combustion chamber
- fuel
- distribution plate
- air distribution
- fluidized bed
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Abstract
The utility model provides a fluidized bed boiler with fuel sieving mechanism, including dispenser, combustion chamber and sieving mechanism, dispenser one end is connected with the sieving mechanism, and the dispenser other end is connected with the combustion chamber, and the combustion chamber bottom is equipped with row's sediment device, and the combustion chamber passes through returning charge device and separator UNICOM. The utility model has the advantages that: install the sieving mechanism before the dispenser, the sieving mechanism passes through the effect of motor, eccentric transfer line and bearing, can make the machine shake, can fall great and less fuel screening, avoids the coal slime system to stop the fortune or cause the jam because of the trouble, has improved fluidized bed boiler's work efficiency, and sediment device and returning charge device can promote fuel manifold cycles and use, have improved combustion efficiency.
Description
Technical Field
The utility model belongs to the technical field of the boiler, especially, relate to a fluidized bed boiler with fuel sieving mechanism.
Background
Fluidized bed boiler technology is a high-efficiency low-pollution clean combustion technology which is rapidly developed in recent ten years, and the technology is widely applied to the fields of power station boilers, industrial boilers, waste treatment and utilization and the like.
The middle feeding is selected for blending and burning coal slime in a large fluidized bed boiler, the types of feeders are roughly divided into blowing type feeding, spiral type feeding and straight-through type feeding, the blocking phenomenon is easily caused, and the blocking treatment method is generally manual cleaning and is easily scalded by personnel. A large amount of high-temperature hot ash can be generated in the operation process of the fluidized bed boiler, if the high-temperature hot ash in the fluidized bed boiler is not taken out, the fluidized bed boiler can be cooled in a long time, the cooling time of the fluidized bed boiler is prolonged, and a large amount of heat energy is wasted. At present, most of fluidized bed boilers mainly discharge slag in a form of bottom slag, and the bottom slag enters a slag cooler for cooling. During slag discharge, along with the discharge of large slag at the bottom, a large amount of fine particles deposited at the bottom of the hearth are discharged along with the large slag, so that the loss of fine bed materials is large. Meanwhile, the bottom slag discharge mainly depends on gravity to fall, so that a dead zone for material flow is formed near a slag discharge port, the temperature field is uneven, the heat exchange efficiency of the buried pipe is influenced, and the heat efficiency is low.
Disclosure of Invention
The utility model aims to solve the problem of providing a fluidized bed boiler; is particularly suitable for a fluidized bed boiler with a fuel screening device, which is provided with the fuel screening device and can reduce the loss of fine bed materials during slag discharge.
In order to solve the technical problem, the utility model discloses a technical scheme is: a fluidized bed boiler with a fuel screening device comprises a feeder, a combustion chamber and the screening device, wherein one end of the feeder is connected with the screening device, the other end of the feeder is connected with the combustion chamber, a slag discharging device is arranged at the bottom of the combustion chamber, the screening device comprises a frame, a screen, a transmission mechanism and a motor, a fuel inlet and a fuel outlet are arranged on the frame, the fuel inlet is positioned at the upper part of the frame, the fuel outlet is parallelly arranged at the side surface of the frame, the screen is arranged inside the frame, the screen and the frame form a cavity, the cavity is communicated with the fuel outlet, the transmission mechanism is arranged at the bottom of the frame, the slag discharging device comprises an air distribution plate, a slag discharging bed and a slag discharging pipe, the slag discharging bed is arranged at the outer side of the lower part of the combustion chamber, and is communicated with the combustion chamber, the air distribution plate is arranged on the bottom surface of the combustion chamber, and the slag discharging pipe is arranged at the bottom of the slag discharging bed.
Further, the screen cloth includes first screen cloth and second screen cloth, the fuel outlet includes first export, second export and third export, frame upper portion space with first screen cloth upper surface forms first cavity, first screen cloth lower surface with second screen cloth upper surface forms the second cavity, second screen cloth lower surface with frame lower part space forms the third cavity, first cavity UNICOM the first export, the second cavity UNICOM the second export, the third cavity UNICOM the third export.
Further, drive mechanism includes axis of rotation, belt and eccentric dwang, the axis of rotation with the motor passes through the belt is connected, the axis of rotation with frame bottom fixedly connected with eccentric dwang.
Further, the first screen diameter is larger than the second screen diameter, and the second outlet is communicated with the feeder.
Furthermore, the slag discharging bed is arranged on two sides of the lower part of the combustion chamber, a baffle is arranged between the combustion chamber and the slag discharging bed, through holes are respectively arranged on the upper part of the baffle and the lower part of the baffle, and the slag discharging bed is communicated with the combustion chamber through the through holes.
Further, the air distribution plate comprises a first air distribution plate and a second air distribution plate, the diameter of the first air distribution plate is larger than that of the second air distribution plate, the first air distribution plate is arranged at the bottom of the combustion chamber, the second air distribution plate is arranged at the bottom of the deslagging bed, a heat exchange tube is arranged inside the deslagging bed, and the second air distribution plate is arranged above the deslagging tube and below the heat exchange tube.
The separator comprises an upper cylinder and a lower cylinder, the upper cylinder is a cylinder, the lower cylinder is a cone, the cylinder part of the lower cylinder is connected with the upper cylinder, the top of the upper cylinder is provided with an exhaust hole, the exhaust hole is connected with a flue gas pipeline, the side surface of the upper cylinder is provided with an air inlet hole, the air inlet hole is connected with the upper part of the combustion chamber, and the cone part of the lower cylinder is communicated with the lower part of the combustion chamber through a material returning device.
Furthermore, the material returning device comprises a material inlet and a material returning port, the material inlet is arranged below the separator, and the material returning port is communicated with the combustion chamber.
Furthermore, a third air distribution plate is arranged in the material returning device, and a plurality of air caps are arranged on the third air distribution plate.
Furthermore, the separator is internally provided with a plurality of partition plates extending in the vertical direction, and the partition plates are uniformly distributed on the inner wall of the upper cylinder of the separator.
The utility model has the advantages and positive effects that:
1. the utility model discloses install the sieving mechanism before the dispenser, the sieving mechanism passes through the effect of motor, eccentric transfer line and bearing, can make the machine vibrations, can fall great and less fuel screening, avoids the coal slime system to shut down or cause the jam because of the fault, has improved fluidized bed boiler's work efficiency.
2. The utility model discloses the sediment of lime-ash that produces after the combustion chamber is burnt just flows to the sediment bed of arranging in the combustion chamber bottom under the wind-force effect, and great lime-ash is discharged from row's sediment pipe, and less lime-ash flows to furnace inner loop once more and utilizes. Therefore, the circulating fluidized bed boiler can reduce the loss of fine bed materials during slag discharge, so that the fluidization of the circulating fluidized bed boiler is better, the combustion and desulfurization efficiency is improved, the material flowability near the slag discharge pipe is better, no flow dead zone exists, and the temperature field is more uniform.
3. The utility model discloses be equipped with the baffle in that the separator is inside, can further carry out the gas-solid separation to the flue gas when carrying the flue gas, make the partial granule in the flue gas separate out, improved the separation effect of separator.
4. The utility model discloses install the returning charge device, returning charge device connects separator and combustion chamber, through adjusting returning charge device bottom hood position and quantity, makes to form in the returning charge device sealed space and dredges two spaces in looks district and dense district, simple structure, flexible operation, low price.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the embodiment of the present invention
FIG. 2 is a schematic structural diagram of a separator according to an embodiment of the present invention
FIG. 3 is a schematic structural diagram of a material returning device of an embodiment of the present invention
FIG. 4 is a schematic structural diagram of a screening device according to an embodiment of the present invention
FIG. 5 is a schematic structural view of a slag discharge device according to an embodiment of the present invention
In the figure:
1. feeder 2, combustion chamber 3, separator
4. Screening device 5, slag discharging device 6 and material returning device
7. Flue gas pipeline 8, upper cylinder 9 and lower cylinder
10. Exhaust hole 11, intake hole 12 and clapboard
13. Feeding port 14, material returning port 15 and third air distribution plate
16. Hood 17, third chamber 18, second chamber
19. Frame 20, fuel inlet 21, first chamber
22. First screen 23, first outlet 24, second screen
25. Second outlet 26, third outlet 27, transmission mechanism
28. Eccentric rotating rod 29, rotating shaft 30 and belt
31. Motor 32, through hole 33 and slag discharging bed
34. The slag discharge pipe 35, the first air distribution plate 36 and the second air distribution plate
37. Heat exchange tube 38, baffle
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings:
as shown in fig. 1, a fluidized bed boiler with a fuel screening device comprises a feeder 1, a combustion chamber 2 and a screening device 4, wherein one end of the feeder 1 is connected with the screening device 4, the other end of the feeder 1 is connected with the combustion chamber 2, a slag discharging device 5 is arranged at the bottom of the combustion chamber 2, and the combustion chamber 2 is communicated with a separator 3 through a material returning device 6. As shown in fig. 2, the separator 3 includes an upper tube 8 and a lower tube 9, the upper tube 8 is a cylinder, the lower tube 9 is a cone, the cylinder portion of the lower tube 9 is connected with the upper tube 8, the top of the upper tube 8 is provided with an exhaust hole 10, the exhaust hole 10 is connected with the flue gas pipe 7, the side of the upper tube 8 is provided with an air inlet 11, the air inlet 11 is connected with the upper portion of the combustion chamber 2, and the cone portion of the lower tube 9 is communicated with the lower portion of the combustion chamber 2 through the material returning device 6. The separator 3 is internally provided with a plurality of partition plates 12, the partition plates 12 extend along the vertical direction, and the partition plates 12 are uniformly distributed on the inner wall of the upper barrel 8 of the separator 3.
As shown in fig. 3, the material returning device 6 includes a material inlet 13 and a material returning port 14, the material inlet 13 is disposed below the separator 3, and the material returning port 14 is communicated with the combustion chamber 2. A third air distribution plate 15 is arranged in the material returning device 6, and a plurality of ventilating air caps 16 are arranged on the third air distribution plate 15.
As shown in fig. 4, the screening apparatus 4 comprises a frame 19, a screen, a transmission 27 and a motor 31. The frame 19 is provided with a fuel inlet 20 and a fuel outlet, and the fuel inlet 20 is located at the upper part of the frame 19. The fuel outlets include a first outlet 23, a second outlet 25 and a third outlet 26, which are disposed parallel to the side of the frame 19. The screens include a first screen 22 and a second screen 24, the first screen 22 having a larger diameter than the second screen 24, the screens being disposed within the frame 19. The screen and the frame 19 form a chamber, the upper space of the frame 19 and the upper surface of the first screen 22 form a first chamber 21, the lower surface of the first screen 22 and the upper surface of the second screen 24 form a second chamber 18, the lower surface of the second screen 24 and the lower space of the frame 19 form a third chamber 17, the first chamber 21 is communicated with the first outlet 23, the second chamber 18 is communicated with the second outlet 25, and the third chamber 17 is communicated with the third outlet 26. The second outlet 25 communicates with the feeder 1. The transmission mechanism 27 is arranged at the bottom of the frame 19, the transmission mechanism 27 comprises a rotating shaft 29, a belt 30 and an eccentric rotating rod 28, the rotating shaft 29 is connected with the motor 31 through the belt 30, and the rotating shaft 29 is fixedly connected with the eccentric rotating rod 28 at the bottom of the frame 19.
As shown in fig. 5, the slag discharging device 5 comprises an air distribution plate, a slag discharging bed 33 and a slag discharging pipe 34, wherein the slag discharging bed 33 is arranged at two sides of the lower part of the combustion chamber 2, a baffle 38 is arranged between the combustion chamber 2 and the slag discharging bed 33, through holes 32 are respectively arranged at the upper part of the baffle 38 and the lower part of the baffle 38, and the slag discharging bed 33 is communicated with the combustion chamber 2 through the through holes 32. The air distribution plate is arranged on the bottom surface of the combustion chamber 2, and the slag discharge pipe 34 is arranged at the bottom of the slag discharge bed 33. The air distribution plate comprises a first air distribution plate 35 and a second air distribution plate 36, the diameter of the first air distribution plate 35 is larger than that of the second air distribution plate 36, the first air distribution plate 35 is arranged at the bottom of the combustion chamber 2, the second air distribution plate 36 is arranged at the bottom of the deslagging bed 33, a heat exchange tube 37 is arranged inside the deslagging bed 33, and the second air distribution plate 36 is arranged above the deslagging tube 34 and below the heat exchange tube 37.
The working process of the embodiment: before the fire coal enters the combustion chamber 2, the fire coal enters the feeder 1 through the screening device 4, the oversize and undersize fuel is screened, and the working principle of the screening device 4 is as follows: the frame 19 is placed in a horizontal position, the power supply is switched on, the working switch is started, and the motor is ensured to run clockwise, so that the machine is indicated to enter a correct working state. The screened fuel is then poured into the fuel inlet 20 and the material is made to enter the screen by adjusting the stopper plate at the bottom of the opening correctly according to the size of the fuel particles. The lower part of the screen is provided with bearings which are respectively fixed in channel steel on the frame 19 to do linear reciprocating motion; one side of the frame 19 is coordinated with a crankshaft or an eccentric wheel driven by the motor 31 through the eccentric rotating rod 28, so that the whole screening process is completed, the blockage caused by overlarge coal slime or the leakage of the undersize coal slime from a combustion chamber is avoided, and the working efficiency of the fluidized bed boiler is improved. The fire coal enters the combustion chamber 2, the first air distribution plate 35 blows air into the combustion chamber 2, so that the fuel is combusted in the combustion chamber 2, ash generated after combustion is deposited at the bottom of the combustion chamber 2, the ash flows into the slag discharging bed 33 through the through hole 32 and is sufficiently fluidized under the action of wind power through the second air distribution plate 36, smaller ash flows back into the combustion chamber 2 through the through hole 32 for fluidized combustion again, larger ash is deposited at the bottom of the slag discharging bed 33 and is discharged through the slag discharging pipe 34, and therefore recycling of the fuel is achieved inside the fluidized bed boiler. The solid material carried out of the combustion chamber 2 by the gas flow is collected in the separator 3 and returned to the combustion chamber 2 by means of the return device 6. After the fly ash separated by the separator 3 enters the material returning device 6, the fly ash falls downwards, and under the ventilation action of the blast cap 16, the fuel with small particles which are not fully combusted is supported and floated. The fly ash fuel in suspension state flows under the negative pressure of air, and then enters the material return opening 14 upwards under the pushing of the blast cap 16, and in the process of rising, because the fuel has certain gravity action and falls gradually, the fuel smoothly enters the combustion chamber 2 to form a circulation loop, and the fly ash which is not fully combusted returns to the combustion chamber 2 to be fully combusted continuously.
Utility model has the advantages and positive effect be:
1. the utility model discloses install the sieving mechanism before the dispenser, the sieving mechanism passes through the effect of motor, eccentric transfer line and bearing, can make the machine vibrations, can fall great and less fuel screening, avoids the coal slime system to shut down or cause the jam because of the fault, has improved fluidized bed boiler's work efficiency.
2. The utility model discloses the sediment of lime-ash that produces after the combustion chamber is burnt just flows to the sediment bed of arranging in the combustion chamber bottom under the wind-force effect, and great lime-ash is discharged from row's sediment pipe, and less lime-ash flows to furnace inner loop once more and utilizes. Therefore, the circulating fluidized bed boiler can reduce the loss of fine bed materials during slag discharge, so that the fluidization of the circulating fluidized bed boiler is better, the combustion and desulfurization efficiency is improved, the material flowability near the slag discharge pipe is better, no flow dead zone exists, and the temperature field is more uniform.
3. The utility model discloses be equipped with the baffle in that the separator is inside, can further carry out the gas-solid separation to the flue gas when carrying the flue gas, make the partial granule in the flue gas separate out, improved the separation effect of separator.
4. The utility model discloses install the returning charge device, returning charge device connects separator and combustion chamber, through adjusting returning charge device bottom hood position and quantity, makes to form in the returning charge device sealed space and dredges two spaces in looks district and dense district, simple structure, flexible operation, low price.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.
Claims (10)
1. The utility model provides a fluidized bed boiler with fuel sieving mechanism, includes feeder, combustion chamber and sieving mechanism, its characterized in that: one end of the feeder is connected with the screening device, the other end of the feeder is connected with the combustion chamber, the bottom of the combustion chamber is provided with a slag discharge device, the screening device comprises a frame, a screen, a transmission mechanism and a motor, the frame is provided with a fuel inlet and a fuel outlet, the fuel inlet is positioned at the upper part of the frame, the fuel outlet is arranged on the side surface of the frame in parallel, the screen is arranged in the frame, the screen and the frame form a chamber, the chamber is communicated with the fuel outlet, the transmission mechanism is arranged at the bottom of the frame, the slag discharging device comprises an air distribution plate, a slag discharging bed and a slag discharging pipe, the slag discharging bed is arranged at the outer side of the lower part of the combustion chamber and is communicated with the combustion chamber, the air distribution plate is arranged on the bottom surface of the combustion chamber, and the slag discharging pipe is arranged at the bottom of the slag discharging bed.
2. The fluidized bed boiler with a fuel screening apparatus according to claim 1, wherein: the screen cloth includes first screen cloth and second screen cloth, the fuel outlet includes first export, second export and third export, frame upper portion space with first screen cloth upper surface forms first cavity, first screen cloth lower surface with second screen cloth upper surface forms the second cavity, second screen cloth lower surface with frame lower part space forms the third cavity, first cavity UNICOM first export, second cavity UNICOM the second export, third cavity UNICOM the third export.
3. The fluidized bed boiler with a fuel screening apparatus according to claim 1 or 2, wherein: drive mechanism includes axis of rotation, belt and eccentric dwang, the axis of rotation with the motor passes through the belt is connected, the axis of rotation with frame bottom fixedly connected with eccentric dwang.
4. The fluidized bed boiler with a fuel screening apparatus according to claim 2, wherein: the first screen diameter is larger than the second screen diameter and the second outlet is in communication with the feeder.
5. The fluidized bed boiler with a fuel screening apparatus according to claim 1 or 2, wherein: the slag discharging bed is arranged on two sides of the lower portion of the combustion chamber, a baffle is arranged between the combustion chamber and the slag discharging bed, through holes are formed in the upper portion of the baffle and the lower portion of the baffle respectively, and the slag discharging bed is communicated with the combustion chamber through the through holes.
6. The fluidized bed boiler with a fuel screening apparatus according to claim 1 or 2, wherein: the air distribution plate comprises a first air distribution plate and a second air distribution plate, the diameter of the first air distribution plate is larger than that of the second air distribution plate, the first air distribution plate is arranged at the bottom of the combustion chamber, the second air distribution plate is arranged at the bottom of the deslagging bed, a heat exchange tube is arranged inside the deslagging bed, and the second air distribution plate is arranged above the deslagging tube and below the heat exchange tube.
7. The fluidized bed boiler with a fuel screening apparatus according to claim 1 or 2, wherein: the separator comprises an upper barrel and a lower barrel, the upper barrel is a cylinder, the lower barrel is a cone, the cylindrical part of the lower barrel is connected with the upper barrel, the top of the upper barrel is provided with an exhaust hole, the exhaust hole is connected with a flue gas pipeline, the side surface of the upper barrel is provided with an air inlet hole, the air inlet hole is connected with the upper part of the combustion chamber, and the lower barrel cone is communicated with the lower part of the combustion chamber through a material returning device.
8. The fluidized bed boiler with a fuel screening apparatus according to claim 7, wherein: the material returning device comprises a material inlet and a material returning opening, the material inlet is arranged below the separator, and the material returning opening is communicated with the combustion chamber.
9. The fluidized bed boiler with a fuel screening apparatus according to claim 8, wherein: and a third air distribution plate is arranged in the material returning device, and a plurality of air caps are arranged on the third air distribution plate.
10. The fluidized bed boiler with a fuel screening apparatus according to claim 7, wherein: the separator is internally provided with a plurality of partition plates which extend along the vertical direction, and the partition plates are uniformly distributed on the inner wall of the upper cylinder of the separator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922099903.0U CN212481264U (en) | 2019-11-29 | 2019-11-29 | Fluidized bed boiler with fuel screening device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922099903.0U CN212481264U (en) | 2019-11-29 | 2019-11-29 | Fluidized bed boiler with fuel screening device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212481264U true CN212481264U (en) | 2021-02-05 |
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ID=74415104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922099903.0U Active CN212481264U (en) | 2019-11-29 | 2019-11-29 | Fluidized bed boiler with fuel screening device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212481264U (en) |
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2019
- 2019-11-29 CN CN201922099903.0U patent/CN212481264U/en active Active
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