CN210207166U - Medium speed pulverizer buggy concentration and fineness adjusting device - Google Patents
Medium speed pulverizer buggy concentration and fineness adjusting device Download PDFInfo
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- CN210207166U CN210207166U CN201920730708.0U CN201920730708U CN210207166U CN 210207166 U CN210207166 U CN 210207166U CN 201920730708 U CN201920730708 U CN 201920730708U CN 210207166 U CN210207166 U CN 210207166U
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- 239000003245 coal Substances 0.000 claims abstract description 132
- 239000000843 powder Substances 0.000 claims abstract description 65
- 230000009467 reduction Effects 0.000 claims abstract description 26
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims description 73
- 230000005540 biological transmission Effects 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 17
- 238000003466 welding Methods 0.000 claims description 5
- 238000009423 ventilation Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 4
- 210000005239 tubule Anatomy 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model discloses a medium speed pulverizer buggy concentration and fineness adjusting device, including coal pulverizer body, coal breakage pipe, returning charge device, wind powder pipeline and arrange the rotatory separator at wind powder pipeline entrance, rotatory separator comprises rotational speed controller, driving motor, speed reduction drive part, sealed housing and rotor, and the power is through driving motor behind the rotational speed adjusting device, and the motor is rotatory through speed reduction drive part drive rotor. The pulverized coal milled by the coal mill is carried by primary air to enter the rotary separation devices distributed on the powder pipes respectively, and each rotary separation device adjusts the rotating speed through the rotating speed adjusting device so as to adjust the fineness of the pulverized coal, the amount of the pulverized coal in the powder pipes and the primary air volume. The utility model discloses can realize the independent control to different powder pipe buggy fineness, buggy volume and an amount of wind, the electric quantity of consumption turns into the mobile power of a wind powder, not only reduces the ventilation resistance, can also reduce the power consumption of a fan to a certain extent.
Description
Technical Field
The utility model belongs to the technical field of the coal pulverizer, concretely relates to medium speed pulverizer buggy concentration and fineness adjusting device.
Background
In the power generation process of a coal-fired boiler, coal is ground into coal powder by a common coal mill and the coal powder is fed into the boiler for combustion through a primary air-powder pipe. The more common coal mill is a medium speed coal mill. In actual operation, the existing coal powder fineness adjusting and coal powder distributing device has some defects: firstly, because the arrangement of the coal mill cannot ensure that the resistance of each primary air-powder pipe of the coal mill is the same, and the real-time performance and the adjusting effect of the traditional adjustable shrinkage cavity adjusting method are unsatisfactory, the coal powder concentration in each primary air-powder pipe in the operation of the coal mill and the boiler is uneven, and the combustion condition of the boiler is poor; the existing rotary separation device and the adjustable shrinkage cavity device are resistance components for the flow of air powder in the powder making system, so that the ventilation power consumption is increased.
Disclosure of Invention
The utility model aims at providing a medium speed pulverizer buggy concentration and fineness adjusting device to the not enough of existence among medium speed pulverizer buggy fineness adjusting device, buggy distributor and the primary wind levelling device, the reinforcing coal pulverizer is to the powder intertube buggy fineness and the adjustability of buggy concentration.
The utility model discloses a following technical scheme realizes:
a pulverized coal concentration and fineness adjusting device of a medium-speed coal mill comprises a coal mill body, a coal dropping pipe, a material returning device and a primary air-pulverized coal pipeline, wherein the primary air-pulverized coal pipeline is arranged on the upper end face of a top plate at the top of the coal mill body; the material returning device is arranged in the coal mill body, is fixedly arranged along the lower end face of the top plate at the top of the coal mill body and is communicated with the primary air powder pipeline; the coal dropping pipe is arranged at the center of a top plate of the coal mill body at the same side of the primary air-pulverized coal pipeline, the upper end face of the coal dropping pipe is arranged at the outer side of the coal mill body, the lower end face of the coal dropping pipe penetrates through the material returning device and extends into the coal mill body, the device also comprises a rotary separation device arranged at the inlet section of the primary air-pulverized coal pipeline, the rotary separation device consists of a rotating speed regulator, a driving motor, a speed reduction transmission part, a sealing housing and a rotor, and the driving motor is arranged on the top plate of the coal mill body, is controlled by the rotating speed regulator and is positioned at one side of the primary air-pulverized coal pipeline; the sealing housing is arranged in the material returning device, the upper part of the sealing housing is fixed on a top plate of the coal mill body through welding, and the lower part of the sealing housing is fixedly connected with the coal dropping pipe; a speed reduction transmission part is arranged in the sealed housing, one end of the speed reduction transmission part is connected with an output shaft of the driving motor, and the other end of the speed reduction transmission part is connected with a rotating shaft of the rotor; the rotor is arranged in the primary air powder pipeline and used for providing power for flowing of the primary air powder.
Preferably, the rotating separating device further comprises a bearing sealing housing, a sealing housing support and a sealing air duct; the bearing sealing housing is fixedly arranged at the upper part of the rotor; the sealing air pipeline is fixedly arranged on the upper end face of the top plate of the coal mill body, is positioned on one side of the primary air powder pipeline and is communicated with the sealing housing; the sealing housing supports two or more tubules, tubule one end welding is on bearing sealing housing and communicates with each other with it, and the tubule other end welding is on the pipe wall of wind powder pipeline, and at least one of them tubule passes the pipe wall and the sealed wind pipeline intercommunication of wind powder pipeline.
Preferably, a rotating shaft of the rotor is perpendicular to the plane of a pipe orifice of the primary air powder pipeline, the upper part of the rotating shaft is sealed in the bearing sealing housing and is in clearance fit with the bearing sealing housing, and a first clearance is formed at the position where the rotating shaft of the rotor penetrates out of the bearing sealing housing; the lower part of the rotating shaft is positioned in the material returning device and penetrates through the sealing housing, and a second gap is formed at the position where the rotating shaft of the rotor penetrates through the sealing housing.
Preferably, the width of the first gap and the second gap is 1-5 mm.
Preferably, the speed reduction transmission part comprises an input shaft, a transmission shaft, a bearing support and an output shaft; the input shaft is connected with the driving motor, the output shaft is connected with the rotor, two ends of the transmission shaft are respectively connected and matched with the input shaft and the output shaft, and the transmission shaft is supported and fixed by a bearing fixed on the sealing housing.
Preferably, the blades of the rotor are axial flow fan type blades, and the rotating speed of the rotor is 20-400 r/min.
Preferably, four groups of primary air powder pipelines are uniformly arranged along the circumferential direction of the upper surface of the top plate at the top of the coal mill body.
Compared with the prior art, the utility model, have following advantage:
the utility model discloses a medium speed coal pulverizer buggy concentration and fineness adjusting device, cancel original venturi tube of coal pulverizer, rotatory separator or can adjust parts such as folding baffle, adjustable shrinkage cavity, make the coal pulverizer each export the buggy fineness and the buggy concentration of the wind powder pipe can be adjusted independently, in real time to improve the boiler combustion situation; compared with the traditional primary air flow leveling device, such as an adjustable shrinkage hole and a pulverized coal fineness adjusting device, such as a single rotary separator or a static separator, the rotary separation device basically has no flow pressure loss, and the consumed electric quantity is converted into the flow power of primary air powder, so that the ventilation resistance is reduced, and the power consumption of a primary fan can be reduced to a certain degree.
Drawings
Fig. 1 is the overall layout of the utility model.
Fig. 2 is a schematic structural view of the rotary separating device of the present invention.
Fig. 3 is a schematic top view of the present invention.
Fig. 4 is a schematic view of the rotor structure of the present invention.
Fig. 5 is a schematic structural view of the speed reduction transmission component of the present invention.
In the figure, the number is 1-a coal mill body, 2-a coal dropping pipe, 3-a material returning device, 4-a rotary separating device, 5-a primary air powder pipeline, 41-a rotating speed regulator, 42-a driving motor, 43-a speed reduction transmission part, 44-a sealing housing, 45-a rotor, 46-a sealing housing support, 47-a bearing sealing housing, 48-a sealing air pipeline, 49-a second gap, 410-a first gap, 431-an input shaft, 432-a transmission shaft, 433-an output shaft and 434-a bearing support.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
Referring to fig. 1-2, the device for adjusting the concentration and fineness of pulverized coal of a medium-speed coal mill comprises a coal mill body 1, a coal dropping pipe 2, a material returning device 3 and a primary air powder pipeline 5, wherein the primary air powder pipeline 5 is arranged on the upper end face of a top plate at the top of the coal mill body 1; the material returning device 3 is arranged inside the coal mill body, is fixedly arranged along the lower end face of the top plate at the top of the coal mill body 1 and is communicated with the primary air powder pipeline 5; the coal dropping pipe 2 is arranged at the center of a top plate of the coal mill body 1 at the same side as the primary air powder pipeline 5, the upper end face of the coal dropping pipe 2 is arranged at the outer side of the coal mill body 1, and the lower end face of the coal dropping pipe passes through the material returning device 3 and extends into the coal mill body 1; the device also comprises a rotary separation device 4 arranged at the inlet section of the primary air powder pipeline 5, wherein the rotary separation device is composed of a rotating speed regulator 41, a driving motor 42, a speed reduction transmission part 43, a sealing cover shell 44 and a rotor 45, the driving motor 42 is arranged on the top plate of the coal mill body 1, is controlled by the rotating speed regulator 41 and is positioned at one side of the primary air powder pipeline 5; the sealing housing 44 is arranged inside the material returning device 3, the upper part of the sealing housing 44 is fixed on the top plate of the coal mill body 1 by welding, and the lower part of the sealing housing is fixedly connected with the coal dropping pipe 2; a speed reduction transmission part 43 is arranged in the sealed housing 44, one end of the speed reduction transmission part 43 is connected with an output shaft of the driving motor 42, the other end of the speed reduction transmission part 43 is connected with a rotating shaft of the rotor 45, and the speed reduction transmission part 43 performs speed reduction transmission between the shaft of the driving motor 42 and the shaft of the rotor 45, wherein the type of the speed reduction transmission part includes but is not limited to belt transmission and shaft transmission with conical gears; the rotor 45 is arranged in the primary air powder pipeline 5 and used for providing power for flowing of primary air powder; depending on the location of the arrangement of the device, the rotating separating device 4 further comprises a bearing seal housing 47, a seal housing support 46 and a seal air duct 48; the bearing sealing cover 47 is fixedly arranged at the upper part of the rotor 45, and preferably adopts a streamline design to reduce the resistance when primary air powder flows through the part; the sealing air pipeline 48 is fixedly arranged on the upper end face of the top plate of the coal mill body 1, is positioned on one side of the primary air powder pipeline 5 and is communicated with the sealing housing 44; the sealing housing support 46 is two or more thin tubes, one end of each thin tube is welded on the bearing sealing housing 47 and communicated with the bearing sealing housing, the other end of each thin tube is welded on the tube wall of the primary air powder pipeline 5, and at least one thin tube penetrates through the tube wall of the primary air powder pipeline 5 and is communicated with the sealing air pipeline 48; the seal housing support 46 serves both as a support for the bearing seal housing 47 and as a source of sealing wind thereto, providing sealing wind thereto.
In this embodiment, the rotating shaft of the rotor 45 is perpendicular to the plane of the nozzle of the primary air powder pipeline 5, the upper part of the rotating shaft is sealed in the bearing sealing housing 47 and is in clearance fit with the bearing sealing housing 47, and a first clearance 410 is arranged at the position 47 where the rotating shaft of the rotor 45 penetrates through the bearing sealing housing 47; the lower part of the rotating shaft is positioned in the material returning device 3 and penetrates through the sealing cover 44, and the rotating shaft of the rotor 45 penetrates through the sealing cover 44 to be provided with a second gap 49. The sealing air source is the same as the existing sealing air source of the coal mill and is provided by the sealing fan, when the sealing air is introduced into a thin tube of the sealing cover shell support 46 by the sealing fan, one part of the sealing air is directly introduced into the sealing air pipeline 48 and further introduced into the sealing cover shell 44 to seal the speed reduction transmission part 43 in the sealing air pipeline, the other part of the sealing air firstly leaks into the primary air powder pipeline 5 from the first gap 410 and then leaks into the coal mill from the second gap 49 to be mixed with the primary air powder, so that the speed reduction transmission part 43 is sealed, and the coal powder is prevented from entering the sealing cover shell 44 to pollute parts and cause abrasion of mechanical parts.
In this embodiment, the widths of the first gap 410 and the second gap 49 are 1-5 mm.
In this embodiment, the reduction transmission part 43 includes an input shaft 431, a transmission shaft 432, a bearing support 434, and an output shaft 433; the input shaft 431 is connected with the driving motor 42, the output shaft 433 is connected with the rotor 45, two ends of the transmission shaft 432 are provided with conical gears and are respectively matched and connected with the conical gears at one ends of the input shaft 431 and the output shaft 433, and the transmission shaft 432 is supported and fixed by a bearing support 434 welded and fixed on the sealing housing 44.
Referring to fig. 4, in the present embodiment, the blades of the rotor 45 are axial flow fan type blades, and the surfaces thereof are anti-wear treated, but in practical applications, the preferred blade and rotor forms can be selected according to the power consumption and separation effect of the rotating separation device, based on the principle that the rotation of the rotor can provide part of the power for the primary air powder to flow or at least not increase the flow resistance thereof. The speed of rotation of the rotor 45 can be adjusted within a range of 20-400 r/min.
Referring to fig. 3, in the present embodiment, four sets of the primary air powder pipelines 5 are uniformly arranged along the circumferential direction of the upper surface of the top plate of the coal mill body 1. For the arrangement situation of a part of powder making systems of the boiler, for example, the situation that some two of four pulverized coal pipes have similar flow resistance, the other two have similar flow resistance and are different from the former two, only two outlet primary air pulverized coal pipes 5 are arranged at the outlet of the coal mill, the rotary separation device 4 is respectively arranged in the two pipes, and the primary air pulverized coal pipes 5 are divided into four parts after the rotary separation device.
The utility model discloses a concrete working process does:
untreated mixed pulverized coal falls into a main working area of a coal mill main body 1 through a coal dropping pipe 2, the area comprises a coal mill base, a primary air inlet, an air ring, a motor, a reduction gearbox, a grinding bowl, a grinding roller and the like, and the area is of an existing traditional coal mill structure. The pulverized coal is carried to the upper space of the coal mill by primary air after being milled, and after passing through the disassembling direction baffle of the material returning device and the rotor 45 rotating by the rotating separation device 4, the coarse pulverized coal is separated by the rotating rotor and then falls back to the material returning device 3, and falls into the grinding bowl of the coal mill main body 1 to be ground again under the gravity, and the finer pulverized coal enters the primary air powder pipeline 5 through the rotor and is sent into a boiler for combustion. The rotor 45 is driven by the driving motor 42 via the speed reduction transmission part 43, and the power supply is adjusted by the motor speed regulator 41 to control the movement of the driving motor 42. In the operation process, the fineness of the pulverized coal can be synchronously adjusted by adjusting the rotating speed of each rotary separation device 4 in the same direction; the fineness and the concentration of the pulverized coal can be independently adjusted for each primary air-powder pipeline 5 by respectively adjusting the rotating speed of each rotary separation device 4.
The specific method for online adjusting the fineness of the pulverized coal, the primary air speed and the concentration of the pulverized coal in each pipe by combining the existing online primary air speed, online pulverized coal fineness and online pulverized coal concentration measuring device is as follows:
the method for regulating the fineness of the coal powder fed into the furnace comprises the following steps: and the rotating speed of the rotary separation devices on the pulverized coal pipes is synchronously adjusted in the same direction, if pulverized coal is thick, the rotating speed of each device is increased, primary air pressure at the inlet of the coal mill is synchronously and properly reduced to protect primary air quantity, otherwise, the rotating speed of each device is reduced, and the primary air pressure at the inlet of the coal mill is properly increased to realize the adjustment of fineness of the pulverized coal entering the furnace.
The primary wind speed and coal powder concentration online leveling method comprises the following steps: meanwhile, the rotary separation devices on the pulverized coal pipes are respectively adjusted in different directions and different amplitudes to realize primary air on-line leveling or pulverized coal concentration leveling of the pipes, the adjustment direction is that the rotating speed of the separation device is increased, the primary air speed of the pulverized coal pipe is high, and the pulverized coal concentration is high; otherwise, the primary wind speed is low, and the coal powder concentration is low. And adjusting and coupling the primary wind speed and the pulverized coal concentration.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and improvements can be made without departing from the inventive concept, and all of them belong to the protection scope of the present invention.
Claims (7)
1. A pulverized coal concentration and fineness adjusting device of a medium-speed coal mill comprises a coal mill body (1), a coal dropping pipe (2), a material returning device (3) and a primary air powder pipeline (5), wherein the primary air powder pipeline (5) is arranged on the upper end face of a top plate at the top of the coal mill body (1); the material returning device (3) is arranged in the coal mill body, is fixedly arranged along the lower end face of the top plate of the coal mill body (1) and is communicated with the primary air powder pipeline (5); coal breakage pipe (2) and primary air powder pipeline (5) homonymy locate the top roof center department of coal pulverizer body (1), and the outside of coal pulverizer body (1) is located to the up end of coal breakage pipe (2), and inside lower terminal surface passed feed back device (3) and stretched into coal pulverizer body (1), its characterized in that: the device also comprises a rotary separation device (4) arranged at the inlet section of the primary air powder pipeline (5), wherein the rotary separation device consists of a rotating speed regulator (41), a driving motor (42), a speed reduction transmission part (43), a sealing housing (44) and a rotor (45), the driving motor (42) is arranged on a top plate of the top of the coal mill body (1), is controlled by the rotating speed regulator (41) and is positioned on one side of the primary air powder pipeline (5); the sealing housing (44) is arranged in the material returning device (3), the upper part of the sealing housing (44) is fixed on a top plate of the top of the coal mill body (1) through welding, and the lower part of the sealing housing is fixedly connected with the coal dropping pipe (2); a speed reduction transmission part (43) is arranged in the sealed housing (44), one end of the speed reduction transmission part (43) is connected with an output shaft of the driving motor (42), and the other end of the speed reduction transmission part is connected with a rotating shaft of the rotor (45); the rotor (45) is arranged in the primary air powder pipeline (5) and used for providing power for flowing of the primary air powder.
2. The device for adjusting the concentration and the fineness of the pulverized coal of the medium-speed coal mill according to claim 1, is characterized in that: the rotating separating device (4) further comprises a bearing sealing housing (47), a sealing housing support (46) and a sealing air duct (48); the bearing sealing housing (47) is fixedly arranged at the upper part of the rotor (45); the sealing air pipeline (48) is fixedly arranged on the upper end face of a top plate at the top of the coal mill body (1), is positioned on one side of the primary air powder pipeline (5), and is communicated with the sealing housing (44); the sealing housing supports (46) are two or more thin tubes, one ends of the thin tubes are welded on the bearing sealing housing (47) and communicated with the bearing sealing housing, the other ends of the thin tubes are welded on the tube wall of the primary air powder pipeline (5), and at least one thin tube penetrates through the tube wall of the primary air powder pipeline (5) and is communicated with the sealing air pipeline (48).
3. The device for adjusting the concentration and the fineness of the pulverized coal of the medium-speed coal mill according to claim 2, is characterized in that: the rotating shaft of the rotor (45) is vertical to the plane of the pipe orifice of the primary air powder pipeline (5), the upper part of the rotating shaft is sealed in the bearing sealing housing (47) and is in clearance fit with the bearing sealing housing (47), and a first clearance (410) is arranged at the position (47) where the rotating shaft of the rotor (45) penetrates out of the bearing sealing housing; the lower part of the rotating shaft is positioned in the material returning device (3) and penetrates through the sealing housing (44), and a second gap (49) is formed at the position where the rotating shaft of the rotor (45) penetrates through the sealing housing (44).
4. The device for adjusting the concentration and the fineness of the pulverized coal of the medium-speed coal mill according to claim 3, is characterized in that: the width of the first gap (410) and the second gap (49) is 1-5 mm.
5. The device for adjusting the concentration and the fineness of the pulverized coal of the medium-speed coal mill according to claim 1, is characterized in that: the reduction transmission part (43) comprises an input shaft (431), a transmission shaft (432), a bearing support (434) and an output shaft (433); the input shaft (431) is connected with the driving motor (42), the output shaft (433) is connected with the rotor (45), two ends of the transmission shaft (432) are respectively connected and matched with the input shaft (431) and the output shaft (433), and the transmission shaft (432) is supported and fixed by a bearing support (434) fixed on the sealing housing (44).
6. The device for adjusting the concentration and the fineness of the pulverized coal of the medium-speed coal mill according to claim 1, is characterized in that: the blades of the rotor (45) are axial flow fan type blades, and the rotating speed of the rotor is 20-400 r/min.
7. The device for adjusting the concentration and the fineness of the pulverized coal of the medium-speed coal mill according to claim 1, is characterized in that: the four groups of primary air powder pipelines (5) are uniformly arranged along the circumferential direction of the upper surface of the top plate of the coal mill body (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920730708.0U CN210207166U (en) | 2019-05-21 | 2019-05-21 | Medium speed pulverizer buggy concentration and fineness adjusting device |
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| CN201920730708.0U CN210207166U (en) | 2019-05-21 | 2019-05-21 | Medium speed pulverizer buggy concentration and fineness adjusting device |
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| CN210207166U true CN210207166U (en) | 2020-03-31 |
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| CN201920730708.0U Active CN210207166U (en) | 2019-05-21 | 2019-05-21 | Medium speed pulverizer buggy concentration and fineness adjusting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110064491A (en) * | 2019-05-21 | 2019-07-30 | 江苏方天电力技术有限公司 | A kind of medium-speed pulverizer coal powder density and fineness regulation device and application method |
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2019
- 2019-05-21 CN CN201920730708.0U patent/CN210207166U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110064491A (en) * | 2019-05-21 | 2019-07-30 | 江苏方天电力技术有限公司 | A kind of medium-speed pulverizer coal powder density and fineness regulation device and application method |
| CN110064491B (en) * | 2019-05-21 | 2023-11-28 | 江苏方天电力技术有限公司 | Medium speed coal mill pulverized coal concentration and fineness adjusting device and application method |
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