CN212663731U - Device for adjusting coal powder fineness of medium-speed roller coal mill - Google Patents
Device for adjusting coal powder fineness of medium-speed roller coal mill Download PDFInfo
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- CN212663731U CN212663731U CN202021129362.8U CN202021129362U CN212663731U CN 212663731 U CN212663731 U CN 212663731U CN 202021129362 U CN202021129362 U CN 202021129362U CN 212663731 U CN212663731 U CN 212663731U
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- buggy
- separator
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Abstract
The utility model provides a device for adjusting intermediate speed roller-type coal pulverizer buggy fineness, intermediate speed roller-type coal pulverizer includes coal breakage pipe, buggy distributor box and pulverized coal separator, and buggy distributor box, pulverized coal separator set up outside coal breakage pipe with the same axial lead with the coal breakage pipe respectively, wherein: the pulverized coal distribution box is arranged above the pulverized coal separator, the bottom inlet of the pulverized coal distribution box is connected with the top outlet of the coal dropping cone of the pulverized coal separator, a cylindrical channel extending towards the interior of the coal dropping cone is arranged at the connecting part, and a conical blocking net is arranged between the inner wall of the cylindrical channel and the outer wall of the coal dropping pipe. The utility model discloses an add the tube-shape passageway and set up and block the net to the bottom entrance of buggy distributor box, prolonged exit length, made the buggy carry out thickness separation in advance, the buggy screening is more thorough under the equal wind speed, and export buggy fineness reduces, can satisfy design coal kind buggy fineness requirement completely.
Description
Technical Field
The utility model relates to a coal pulverizer technical field, concretely relates to a device for adjusting medium speed roll-type coal pulverizer buggy fineness.
Background
At present, the coal powder fineness R90= 10-40% (static separator) of a medium-speed roller coal mill on the market is mainly characterized in that: the pulverized coal enters a grinding roller to grind and dry simultaneously, primary air uniformly enters the periphery of a grinding ring through a nozzle ring, a pulverized coal mixture which is milled and thrown off from the grinding ring is dried and conveyed to a separator at the upper part of a coal mill to be separated, coarse powder is separated out and returns to the grinding ring to be reground, and qualified fine powder is taken out of the separator by the primary air; the coal powder fineness adjustment is mainly adjusted by a deflecting baffle at the outlet of the separator, the air-coal ratio and the hydraulic loading force, and the coal powder fineness can basically reach the design guarantee value of R90= 17%.
The design can meet the pulverized coal fineness adjustment in a large range, but under the condition that the boiler room adopts the arrangement of the side coal bunker, the pulverized coal fineness requirement cannot be met by various means of adjustment, and further the thermal efficiency of the boiler is seriously influenced.
Disclosure of Invention
In order to solve the adjustment of the coal pulverizer coal dust fineness under the condition that the boiler room adopts the side bunker to arrange specifically, reach coal dust fineness technical requirement R90=17%, the utility model provides a device for adjusting medium speed roller-type coal pulverizer coal dust fineness.
Therefore, the technical scheme of the utility model is that: the utility model provides a device for adjusting medium speed roller-type coal pulverizer buggy fineness, medium speed roller-type coal pulverizer includes coal breakage pipe, buggy distributor box and pulverized coal separator, and buggy distributor box, pulverized coal separator set up outside coal breakage pipe with the same axial lead of coal breakage pipe respectively, wherein: the coal powder distribution box is arranged above the coal powder separator, and the bottom inlet of the coal powder distribution box is connected with the coal falling cone top outlet of the coal powder separator, and is characterized in that:
a cylindrical channel extending towards the inside of the coal dropping cone is arranged at the bottom inlet of the coal powder distribution box and the top outlet of the coal dropping cone of the coal powder separator, a conical blocking net is arranged between the inner wall of the cylindrical channel and the outer wall of the coal dropping pipe, and the mesh number of the blocking net is matched with the fineness of the coal powder.
Preferably, the cylindrical channel is made of a manganese steel plate material through rolling, and the barrier net is made of a stainless steel net material; the manganese steel plate is mainly used for preventing the pulverized coal from flowing in a small channel, and after the pulverized coal is turned, coarse particles scour a turning outer ring due to the action of centrifugal force to cause serious abrasion to the section; the blocking net is made of stainless steel net material, and has good performances of high temperature resistance, corrosion resistance, wear resistance, strong pressure resistance and the like.
Has the advantages that:
the utility model discloses an increase the tube-shape passageway to buggy awl exit, prolonged the length of buggy export, further carry out thickness separation to the buggy through blocking the net simultaneously: when the pulverized coal passes through the first folding door, coarse-particle pulverized coal is screened and removed, when the pulverized coal passes through the improved cylindrical channel, the stroke of the pulverized coal is increased, the pulverized coal cannot move along the whole path of the coarse particles under the condition of original kinetic energy, a blocking net is arranged in the cylindrical channel, the coarse particles are completely screened by the blocking net, and the requirement on the fineness of the pulverized coal of designed coal is met.
Compared with the prior art, the technical scheme has the advantages that:
1. after the cylindrical channel and the blocking net are added, the requirement on the fineness of the pulverized coal is met without increasing loading force, the power consumption of a motor of the coal mill is reduced, the loading force can be reduced by 1-2Mpa under the same output force, and the current is reduced by 2-3A;
2. the opening of the folding door is reduced, so that the abrasion of the folding door is reduced, and the service life of the folding door is prolonged;
3. the coal pulverizer has the advantages that the requirement on the fineness of the pulverized coal is met without excessive adjustment of the air-coal ratio, the thickness of a coal layer of the coal pulverizer is increased, the abrasion between a grinding roller and a grinding disc can be reduced during low-load operation, and the service lives of the grinding roller and the grinding disc are prolonged;
4. the technical scheme has the advantages of simple structure, strong practicability and low modification cost.
Drawings
Fig. 1 is a schematic view of the structure and the working principle of the present invention.
Fig. 2 is a schematic view of the installation position of the tubular passage of the present invention.
Fig. 3 is a plan view of the tubular passage of the present invention.
Shown in the figure: 1. a housing; 2. A milling device; 3. a ventilation system; 4. a coal dropping pipe; 5. a pulverized coal separator; 51. a housing; 52. a coal dropping cone; 53. a rising channel; 54. A pulverized coal separation chamber; 55. a folding door; 6. a pulverized coal distribution box; 61. a pulverized coal outlet; 7. a cylindrical passage; 8. a barrier net.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings, but the embodiment should not be construed as limiting the present invention.
The utility model discloses as shown in fig. 1 to 3:
the structure of the medium-speed roller type coal mill comprises a machine shell 1 fixed on a machine base, a milling device 2 is arranged in the machine shell, a ventilation system 3 for blowing milled coal powder upwards is arranged below the milling device, a coal dropping pipe 4 extending vertically upwards is fixed at the center of the top of the machine shell and positioned right above the milling device, a coal powder separator 5 and a coal powder distribution box 6 are respectively arranged outside the coal dropping pipe from bottom to top, the coal powder separator 5 comprises a shell 51 and a coal dropping cone 52 arranged inside the shell, the height of the coal dropping cone is lower than that of the shell, the shell is in butt joint with the machine shell, a cavity between the inner side of the shell 51 and the outer side of the coal dropping cone 52 forms a coal powder ascending channel 53 and is communicated with the ventilation system in the machine shell, a coal powder separation cavity 54 is formed by a cavity inside the coal dropping cone, the bottom of the coal powder separation cavity is communicated with the milling device in the inner cavity of, A folding door 55 with a folding baffle is arranged at the position far away from the center of the coal dropping pipe, the outlet of the folding door is communicated with the inlet at the top of the coal dropping cone 52, the position at the top of the coal dropping cone 52 close to the center of the coal dropping pipe 4 is provided with an outlet communicated with the bottom of the coal powder distribution box 6, the lower part of the coal powder distribution box 6 is embedded at the top of the shell of the coal powder separator 5, the inlet at the bottom of the coal powder distribution box 6 is connected with the outlet at the top of the coal dropping cone 52, and the top of the coal powder distribution box 6 is provided with a plurality of;
the device for adjusting the coal powder fineness of the medium-speed roller coal mill comprises: a cylindrical channel 7 extending towards the inside of the coal dropping cone is arranged at the bottom inlet of the coal powder distribution box 6 and the top outlet of the coal dropping cone 52 of the coal powder separator 5, a conical blocking net 8 is arranged between the inner wall of the cylindrical channel 7 and the outer wall of the coal dropping pipe 4, the mesh number of the blocking net 8 is matched with the fineness of the coal powder, the blocking net is set to be conical to play a role in guiding, meanwhile, the length of the coal powder passing through is increased, the coarse powder is separated as early as possible, and the blocking net can be arranged at the upper part of the cylindrical channel.
The cylindrical channel 7 is made of a manganese steel plate material through rolling, and the blocking net 8 is made of a stainless steel net material.
Aiming at a middle-speed roller coal mill with model ZGM95N produced by Beijing electrical equipment general factories, the outer diameter of an additionally arranged cylindrical passage is 1452 mm, the wall thickness is 16mm, the height is 200mm, and the taper of a blocking net is 30-60 degrees, the arrangement is proved by practice to completely ensure that the fineness R90 of the pulverized coal at the outlet of a pulverized coal distribution box is controlled within 17 percent.
Compared with a ZGM95N type medium speed roller coal mill which is not added, the technical scheme has the advantages that:
1. after the cylindrical channel and the blocking net are added, the requirement on the fineness of the pulverized coal is met without increasing loading force, the power consumption of a motor of the coal mill is reduced, the loading force can be reduced by 1-2Mpa under the same output force, and the current is reduced by 2-3A;
2. the opening of the folding door is reduced, so that the abrasion of the folding door is reduced, and the service life of the folding door is prolonged;
3. the coal pulverizer has the advantages that the requirement on the fineness of the pulverized coal is met without excessive adjustment of the air-coal ratio, the thickness of a coal layer of the coal pulverizer is increased, the abrasion between a grinding roller and a grinding disc can be reduced during low-load operation, and the service lives of the grinding roller and the grinding disc are prolonged;
4. the technical scheme has the advantages of simple structure, strong practicability and low modification cost.
Those skilled in the art will appreciate that the details of the present invention are not described in detail herein.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (2)
1. The utility model provides a device for adjusting medium speed roller-type coal pulverizer buggy fineness, medium speed roller-type coal pulverizer includes coal breakage pipe, buggy distributor box and pulverized coal separator, and buggy distributor box, pulverized coal separator set up outside coal breakage pipe with the same axial lead of coal breakage pipe respectively, wherein: the coal powder distribution box is arranged above the coal powder separator, and the bottom inlet of the coal powder distribution box is connected with the coal falling cone top outlet of the coal powder separator, and is characterized in that:
a cylindrical channel extending towards the inside of the coal dropping cone is arranged at the bottom inlet of the coal powder distribution box and the top outlet of the coal dropping cone of the coal powder separator, a conical blocking net is arranged between the inner wall of the cylindrical channel and the outer wall of the coal dropping pipe, and the mesh number of the blocking net is matched with the fineness of the coal powder.
2. The device for adjusting the fineness of pulverized coal of a medium-speed roller coal mill according to claim 1, wherein: the cylindrical channel is made of a manganese steel plate material through rolling, and the blocking net is made of a stainless steel net material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021129362.8U CN212663731U (en) | 2020-06-18 | 2020-06-18 | Device for adjusting coal powder fineness of medium-speed roller coal mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021129362.8U CN212663731U (en) | 2020-06-18 | 2020-06-18 | Device for adjusting coal powder fineness of medium-speed roller coal mill |
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| CN212663731U true CN212663731U (en) | 2021-03-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114029154A (en) * | 2021-11-29 | 2022-02-11 | 西安热工研究院有限公司 | Coal mill powder amount adjusting device and working method thereof |
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2020
- 2020-06-18 CN CN202021129362.8U patent/CN212663731U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114029154A (en) * | 2021-11-29 | 2022-02-11 | 西安热工研究院有限公司 | Coal mill powder amount adjusting device and working method thereof |
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