CN216308542U - Air swept type drying mill for coal powder preparation - Google Patents
Air swept type drying mill for coal powder preparation Download PDFInfo
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- CN216308542U CN216308542U CN202122402882.2U CN202122402882U CN216308542U CN 216308542 U CN216308542 U CN 216308542U CN 202122402882 U CN202122402882 U CN 202122402882U CN 216308542 U CN216308542 U CN 216308542U
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Abstract
The utility model discloses an air sweeping type drying mill for coal powder preparation, which comprises a feeding hollow shaft, a feeding end plate, a revolving body, a discharging end plate and a discharging hollow shaft which are sequentially connected, wherein a first spiral conveyor is arranged in the feeding hollow shaft, a jacket is arranged on the first spiral conveyor, an air inlet pipe is arranged at the bottom of the jacket, a baffle group is arranged in the dryer, a first circulating pipe is arranged on the side wall of the dryer, an exhaust fan and a first gas heater are arranged on the first circulating pipe, a screening device is arranged above the revolving body, a second spiral conveyor is arranged at the bottom of the screening device, the screening device is connected with a coal powder collector through a second communicating pipe, a gas outlet of the coal powder collector is communicated with the air inlet pipe through the second circulating pipe, and a second gas heater is arranged on the second communicating pipe. The utility model has high working efficiency, good drying effect, energy saving and consumption reduction, and has obvious economic value and social value.
Description
Technical Field
The utility model relates to the technical field of coal dust processing, in particular to an air swept type drying mill for coal dust preparation.
Background
Coal is an important raw material for large-scale coal-consuming enterprises such as cement plants, power plants, steel plants and the like, and needs to be ground into powder before use in order to improve the combustion efficiency, and an air swept type drying mill is one of main devices of the cement plants, has the function of finely grinding and drying coal, passes through a 200-mesh screen for more than 85% of the fineness of the ground coal powder, has the water content of less than 2%, is an ideal device for coal powder processing, and has the characteristics of high efficiency, energy conservation and environmental protection. When the air swept type drying mill is operated, raw coal and coal are loaded into the mill from a feeding device, hot air at the temperature of about 300 ℃ enters the mill from an air inlet pipe, the coal and the hot air exchange heat in the mill along with the rotation of a mill cylinder, the coal is crushed and ground by steel balls in the mill, and ground fine powder is taken out of the mill from a discharging device through the hot air in the mill.
In recent years, as the price of raw coal is greatly increased, on the premise of reducing the cost of clinker and keeping the calorific value basically unchanged, cheaper coal blending is used, in order to meet the environmental protection requirement in the processes of shoveling, loading and transporting, excessive water is sprayed into the raw coal entering grinding, so that the moisture of the raw coal entering grinding is higher and even reaches 10-12%, the drying capacity of the coal grinding in production is insufficient, the coal grinding partition plate is often blocked, the wet coal at the head of a drying bin is looped, the moisture of coal powder is out of control, the fineness of the coal powder is thicker and difficult to control, the quality and the yield of the coal powder are reduced, and other adverse effects are caused; secondly, during operation, a large amount of hot air is needed, which causes the problems of large operation energy consumption and large heat loss. Therefore, it is an objective need to develop an air swept drying mill for preparing pulverized coal, which has high working efficiency, good drying effect, energy saving and consumption reduction.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an air swept type drying mill for preparing pulverized coal, which has the advantages of high working efficiency, good drying effect, energy conservation and consumption reduction.
The utility model aims to realize the purpose, which comprises a feeding hollow shaft, a feeding end plate, a revolving body, a discharging end plate and a discharging hollow shaft which are connected in sequence, wherein a first screw conveyer is concentrically arranged in the feeding hollow shaft, the feeding end of the first screw conveyer is positioned at the outer side of the feeding hollow shaft, the discharging end of the first screw conveyer extends into the revolving body, a jacket is arranged on a shell of the first screw conveyer, one end of the jacket is of a blocking structure, the other end of the jacket is movably connected with the end part of the feeding hollow shaft in a sealing way, an air inlet pipe is arranged at the bottom of the jacket far away from one side of the feeding hollow shaft, a dryer is arranged above the jacket, a baffle group is arranged in the dryer, the baffle group comprises a plurality of baffle plates which are arranged at intervals up and down and obliquely, the higher end of each baffle plate is fixedly connected with the side wall of the dryer, the lower end of each baffle plate is arranged in a suspended way, and the feeding pipe is arranged at the top of the dryer above the higher end of the topmost baffle plate, the air inlet is formed in the side wall of the dryer below the baffle group, the air outlet is formed in the side wall of the dryer above the baffle group, a first circulating pipe is arranged between the air inlet and the air outlet, an air exhauster and a first gas heater are sequentially arranged on the first circulating pipe along the air flow direction, a screening device is arranged above the revolving body, a screen is arranged inside the screening device, an exhaust pipe is movably connected to the end portion of the hollow discharge shaft in a sealing mode, the end portion of the exhaust pipe is communicated with the side wall of the screening device below the screen through a first communicating pipe, a second spiral conveyor is arranged at the bottom of the screening device, a discharge pipe of the second spiral conveyor is communicated with the top of the dryer, a second communicating pipe is arranged on the screening device above the screen, a pulverized coal collector is arranged on the second communicating pipe, a gas outlet of the pulverized coal collector is communicated with the air inlet pipe through a second circulating pipe, and a second gas heater is arranged on the second communicating pipe.
Furthermore, a plurality of first air holes are formed in the shell of the first spiral conveyor.
Further, the bottom of the jacket is provided with a slag discharge door.
Furthermore, a plurality of second air holes are formed in the baffle plate.
Furthermore, a cyclone dust collector is arranged on a second communicating pipe between the sieving device and the coal dust collector.
When the utility model is in operation, raw coal enters the dryer from the feeding pipe, moves in an S-shaped curve among the baffle plates, simultaneously high-temperature hot gas is introduced from the gas inlet, the high-temperature hot gas flows upwards in the dryer, the high-temperature hot gas and the raw coal are in reverse contact in the dryer, moisture in the raw coal absorbs heat in the high-temperature hot gas and is evaporated, thereby achieving the purpose of drying moisture in the raw coal, when the hot gas reaches the upper part of the dryer, the hot gas is pumped into the first gas heater under the action of the exhaust fan to improve the temperature of the hot gas, thereby facilitating the recycling of the hot gas and reducing the loss of heat, most of moisture in the raw coal after passing through the dryer is evaporated and removed, and then the raw coal falls into the first spiral conveyor and is fed into the revolving body for grinding by the first spiral conveyor, at the moment, the high-temperature hot gas is introduced from the gas inlet pipe, the hot gas enters an annular space between the jacket and the first spiral conveyor, raw coal in the first screw conveyer is heated again, moisture in the raw coal can be thoroughly evaporated, the drying of the raw coal is guaranteed, then hot air enters the revolving body, on one hand, the raw coal which is being ground is dried, on the other hand, the revolving body for discharging pulverized coal which is ground into powder can be wrapped in, the pulverized coal is sent into the sieving device through the first communicating pipe, the pulverized coal is sieved in the sieving device, pulverized coal particles with larger particle sizes are sent into the drying device by the second screw conveyer to be dried and ground again, the pulverized coal particles with the particle sizes meeting the requirements enter the pulverized coal collector to be collected through the second communicating pipe, the residual hot air is sent into the second gas heater through the second circulating pipe, and the temperature is raised and then continuously used. According to the utility model, the raw coal is dried for multiple times, the drying effect is good, the grinding efficiency of the raw coal can be improved, hot gas is recycled, the heat loss is small, the energy-saving and consumption-reducing effects are achieved, the fineness of the pulverized coal can be effectively controlled, and the quality and the yield of the pulverized coal can be improved to a certain extent. The utility model has high working efficiency, good drying effect, energy saving and consumption reduction, and has obvious economic value and social value.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
in the figure: 1-feeding hollow shaft, 2-revolving body, 3-discharging hollow shaft, 4-first screw conveyor, 5-jacket, 6-air inlet pipe, 7-dryer, 8-baffle plate, 9-feeding pipe, 10-first circulating pipe, 11-exhaust fan, 12-first gas heater, 13-screening device, 14-screen, 15-exhaust pipe, 16-first communicating pipe, 17-second screw conveyor, 18-second communicating pipe, 19-pulverized coal collector, 20-second circulating pipe, 21-second gas heater, 22-first air vent, 23-deslagging door, 24-second air vent, 25-cyclone dust collector.
Detailed Description
The present invention is further described with reference to the drawings, but the present invention is not limited thereto in any way, and any modification or improvement based on the present invention is within the protection scope of the present invention.
As shown in figure 1, the coal pulverizer comprises a feeding hollow shaft 1, a feeding end plate, a revolving body 2, a discharging end plate and a discharging hollow shaft 3 which are connected in sequence, wherein the feeding hollow shaft 1, the feeding end plate, the revolving body 2, the discharging end plate and the discharging hollow shaft 3 are all of the existing coal pulverizer structure, when the coal pulverizer is used, large bearings are arranged on the feeding hollow shaft 1 and the discharging hollow shaft 3, large gears are arranged on the revolving body 2, then the large gears are driven to rotate, so that the revolving body 2 can be driven to rotate, a grinding body in the revolving body 2 can grind raw coal to obtain coal powder, a first spiral conveyor 4 is concentrically arranged in the feeding hollow shaft 1, the feeding end of the first spiral conveyor 4 is positioned at the outer side of the feeding hollow shaft 1, the discharging end extends into the revolving body 2, a jacket 5 is arranged on a shell of the first spiral conveyor 4, one end of the jacket 5 is of a plugging structure, the other end is movably connected with the end part of the feeding hollow shaft 1 in a sealing way, the bottom of a jacket 5 far away from one side of the feeding hollow shaft 1 is provided with an air inlet pipe 6, a dryer 7 is arranged above the jacket 5, a baffle group is arranged inside the dryer 7 and comprises a plurality of baffle plates 8 which are arranged at intervals up and down and are inclined, the higher end of each baffle plate 8 is fixedly connected with the side wall of the dryer 7, the lower end of each baffle plate is arranged in a suspension way, the top of the dryer 7 positioned above the higher end of the topmost baffle plate 8 is provided with an inlet pipe 9, the side wall of the dryer 7 below the baffle group is provided with an air inlet, the side wall of the dryer 7 above the baffle group is provided with an air outlet, a first circulating pipe 10 is arranged between the air inlet and the air outlet, an exhaust fan 11 and a first gas heater 12 are sequentially arranged on the first circulating pipe 10 along the air flow direction, and a screen 13 is arranged above the revolving body 2, the inside of the sieve 13 is provided with a screen 14, the end part of the hollow discharging shaft 3 is movably connected with an exhaust pipe 15 in a sealing way, the end part of the exhaust pipe 15 is communicated with the side wall of the sieve 13 below the screen 14 through a first communicating pipe 16, the bottom of the sieve 13 is provided with a second spiral conveyer 17, the discharging pipe of the second spiral conveyer 17 is communicated with the top part of the dryer 7, the sieve 13 above the screen 14 is provided with a second communicating pipe 18, the second communicating pipe 18 is provided with a pulverized coal collector 19, the gas outlet of the pulverized coal collector 19 is communicated with the gas inlet pipe 6 through a second circulating pipe 20, the second communicating pipe 18 is provided with a second gas heater 21, the first spiral conveyer 4, the second spiral conveyer 17, the first gas heater 12 and the second gas heater 21 are all of the existing structure, wherein the first spiral conveyer 4 and the second spiral conveyer 17 are used for conveying coal briquettes and pulverized coal, the first gas heater 12 and the second gas heater 21 are used for heating hot gas, and can be conveniently used by using structures such as electric heating or solar heating.
When the utility model is operated, raw coal enters the dryer 7 from the feeding pipe 9, moves in an S-shaped curve among the baffle plates 8, simultaneously high-temperature hot gas is introduced from the air inlet, the high-temperature hot gas flows upwards in the dryer 7, the high-temperature hot gas and the raw coal are in reverse contact in the dryer 7, moisture in the raw coal absorbs heat in the high-temperature hot gas and is evaporated, thereby achieving the purpose of drying moisture in the raw coal, when the hot gas reaches the upper part of the dryer 7, the hot gas is pumped into the first gas heater 12 under the action of the exhaust fan 11 to improve the temperature of the hot gas, thereby facilitating the cyclic utilization of the hot gas and reducing the loss of heat, most of moisture in the raw coal after passing through the dryer 7 is evaporated and removed, and then the raw coal falls into the first spiral conveyor 4 and is sent into the revolving body 2 for grinding by the first spiral conveyor 4, at this time, the high-temperature hot gas is introduced from the air inlet pipe 6, hot air enters an annular space between the jacket 5 and the first spiral conveyor 4 to heat raw coal in the first spiral conveyor 4 again, so that moisture in the raw coal can be evaporated thoroughly, the raw coal is dried, then the hot air enters the revolving body 2, on one hand, the raw coal which is being ground is dried, on the other hand, pulverized coal which is ground into powder can be wrapped in the revolving body 2, the pulverized coal is sent into the sieving device 13 through the first communicating pipe 10, the pulverized coal is sieved in the sieving device 13, pulverized coal particles with larger particle sizes are sent into the drying device 7 through the second spiral conveyor 17 to be dried and ground again, the pulverized coal particles with the particle sizes meeting the requirements enter the pulverized coal collector 19 through the second communicating pipe 18 to be collected, and the rest hot air is sent into the second air heater 21 through the second circulating pipe 20 to be used continuously after the temperature is raised. According to the utility model, the raw coal is dried for multiple times, the drying effect is good, the grinding efficiency of the raw coal can be improved, hot gas is recycled, the heat loss is small, the energy-saving and consumption-reducing effects are achieved, the fineness of the pulverized coal can be effectively controlled, and the quality and the yield of the pulverized coal can be improved to a certain extent.
Preferably, a plurality of first ventilation holes 22 are formed in the shell of the first spiral conveyor 4, a plurality of second ventilation holes 24 are formed in the baffle plate 8, and ventilation holes 22 are formed in the shell of the first spiral conveyor 4 and the baffle plate 8, so that hot air can pass through the ventilation holes 22, and raw coal at the bottom can also be in contact with the hot air, the contact area between the hot air and the raw coal is increased, the heat exchange area between the hot air and the raw coal is increased, and the evaporation efficiency of moisture in the raw coal is accelerated.
The bottom that presss from both sides the cover 5 is provided with the scum door 23, after processing first bleeder vent 22 on the casing of first screw conveyer 4, the less fine coal of particle diameter probably falls in the bottom that presss from both sides the cover 5 from first bleeder vent 22 in the raw coal, can be taken away by hot-blast entering solid of revolution 2 under the ordinary condition, but meet special circumstances or the operating time is longer after, still probably have partial buggy to form to pile up, thereby reduce hot-blast draught area, will reduce hot-blast amount of wind finally, influence the output of buggy, at this moment, scum door 23 can be opened, it can to discharge accumulational buggy.
The second communicating pipe 18 between the screen 13 and the coal dust collector 19 is provided with a cyclone dust collector 25, the cyclone dust collector 25 is an existing device, and when the cyclone dust collector operates, part of coal dust mixed in hot gas can be collected, so that the load of the coal dust collector 19 is reduced, and the coal dust collection efficiency is improved.
Claims (5)
1. An air sweeping type drying mill for coal dust preparation comprises a feeding hollow shaft (1), a feeding end plate, a revolving body (2), a discharging end plate and a discharging hollow shaft (3) which are sequentially connected, and is characterized in that a first spiral conveyor (4) is concentrically arranged in the feeding hollow shaft (1), the feeding end of the first spiral conveyor (4) is positioned on the outer side of the feeding hollow shaft (1), the discharging end of the first spiral conveyor (4) extends into the revolving body (2), a jacket (5) is arranged on a shell of the first spiral conveyor (4), one end of the jacket (5) is of a plugging structure, the other end of the jacket is movably connected with the end part of the feeding hollow shaft (1) in a sealing manner, an air inlet pipe (6) is arranged at the bottom of the jacket (5) on one side far away from the feeding hollow shaft (1), a dryer (7) is arranged above the jacket (5), and a baffle group is arranged inside the dryer (7), the baffle group comprises a plurality of baffle plates (8) which are arranged at intervals up and down and are obliquely arranged, the higher end of each baffle plate (8) is fixedly connected with the side wall of the dryer (7), the lower end of each baffle plate is arranged in a suspended mode, the top of the dryer (7) above the higher end of the baffle plate (8) at the top is provided with a feeding pipe (9), the side wall of the dryer (7) below the baffle group is provided with an air inlet, the side wall of the dryer (7) above the baffle group is provided with an air outlet, a first circulating pipe (10) is arranged between the air inlet and the air outlet, the first circulating pipe (10) is sequentially provided with an exhaust fan (11) and a first gas heater (12) along the air flow direction, the screening device (13) is arranged above the revolving body (2), the screen (14) is arranged inside the screening device (13), and the end part of the discharging hollow shaft (3) is movably connected with an exhaust pipe (15) in a sealing mode, the end of the exhaust pipe (15) is communicated with the side wall of the screening device (13) below the screen (14) through a first communicating pipe (16), the bottom of the screening device (13) is provided with a second spiral conveyor (17), a discharge pipe of the second spiral conveyor (17) is communicated with the top of the drying device (7), the screening device (13) above the screen (14) is provided with a second communicating pipe (18), the second communicating pipe (18) is provided with a coal dust collector (19), a gas outlet of the coal dust collector (19) is communicated with the air inlet pipe (6) through a second circulating pipe (20), and the second communicating pipe (18) is provided with a second gas heater (21).
2. The air swept drying mill for preparing the pulverized coal as claimed in claim 1, wherein a plurality of first air vents (22) are formed on the shell of the first screw conveyor (4).
3. The air swept drying mill for preparing pulverized coal as claimed in claim 2, wherein a slag discharge door (23) is provided at the bottom of the jacket (5).
4. The air swept drying mill for preparing pulverized coal as claimed in claim 1, wherein the baffle plate (8) is provided with a plurality of second air holes (24).
5. The air swept drying mill for preparing the pulverized coal as claimed in claim 1, wherein a cyclone dust collector (25) is arranged on a second communicating pipe (18) between the screen (13) and the pulverized coal collector (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122402882.2U CN216308542U (en) | 2021-10-08 | 2021-10-08 | Air swept type drying mill for coal powder preparation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122402882.2U CN216308542U (en) | 2021-10-08 | 2021-10-08 | Air swept type drying mill for coal powder preparation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216308542U true CN216308542U (en) | 2022-04-15 |
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ID=81115243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122402882.2U Active CN216308542U (en) | 2021-10-08 | 2021-10-08 | Air swept type drying mill for coal powder preparation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216308542U (en) |
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2021
- 2021-10-08 CN CN202122402882.2U patent/CN216308542U/en active Active
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