CN111185293B

CN111185293B - High-efficient coal grinding system

Info

Publication number: CN111185293B
Application number: CN202010065059.4A
Authority: CN
Inventors: 符群安; 赵红俊; 宋海炤; 刘广涛
Original assignee: JIAXIAN ZHONGLIAN TIANGUANG CEMENT CO Ltd
Current assignee: JIAXIAN ZHONGLIAN TIANGUANG CEMENT CO Ltd
Priority date: 2020-01-20
Filing date: 2020-01-20
Publication date: 2021-07-30
Anticipated expiration: 2040-01-20
Also published as: CN111185293A

Abstract

The invention relates to a high-efficiency coal grinding system which comprises a ball mill, wherein the ball mill comprises a roller and a driving device for driving the roller to rotate, the feeding end of the roller is connected with a feeding pipe, the feeding pipe is rotatably connected with the roller, one end of the feeding pipe, which is far away from the roller, is provided with a related air blower, a hot air pipe is inserted into the roller, the hot air pipe extends out of the side wall of the feeding pipe, the hot air pipe is connected with an air outlet pipe, the air outlet pipe is arranged in parallel with the axis of the roller and is positioned at the upper part of the roller, the air outlet pipe is connected with a plurality of branch pipes which upwards face the inner wall of the roller, the branch pipes are provided with. The invention has the effect of blowing the coal adhered inside the ball mill by hot air and improving the milling efficiency.

Description

High-efficient coal grinding system

Technical Field

The invention relates to the technical field of cement production equipment, in particular to a high-efficiency coal grinding system.

Background

In the cement production process, mining, crushing, pre-homogenizing, batching, raw material grinding, raw material homogenizing, suspension preheating, pre-decomposing, rotary kiln calcining, batching, cement grinding and cement homogenizing are required, wherein in the raw material homogenizing process, raw materials are metered, lifted and fed quantitatively, then are sent to a kiln tail suspension preheater and a decomposing furnace, and the preheated and decomposed materials enter the rotary kiln to calcine clinker. The fuels used in the rotary kiln and the pre-decomposition are coal. Coal is required to be prepared into coal powder by drying and grinding raw coal and stored in a coal powder bin for supply.

The patent document with the publication number of CN204074213U discloses a heating device of fly ash ball mill, including transmission, ball mill, heating furnace, draught fan and air exhauster, the ball mill comprises barrel, feed arrangement and discharge gate, feed arrangement is connected with the feed inlet, the heating furnace lower part be equipped with the air-supply line, the air-supply line is connected with the draught fan, heating furnace upper portion is equipped with the hot-blast main, the hot-blast main be connected with the feed arrangement of ball mill, the discharge gate of air exhauster and ball mill be linked together. Because be equipped with behind the heating furnace, make the cold wind that gets into the ball mill become hot-blast, hot-blast not only plays the temperature that improves the feed cylinder, can make the material be heated moreover, makes the moisture that the material of grinding contained become vapor, then is taken away by the air exhauster, finally reduces the moisture of grinding the material, guarantees the fineness that the material ground, can improve production efficiency moreover.

However, in the above configuration, since it takes time to heat the coal by hot air, the coal is not dried and adhered to the inside of the ball mill, and the milling efficiency is low.

Disclosure of Invention

The invention aims to provide an efficient coal grinding system which has the effect of improving the grinding efficiency by blowing down coal bonded in a ball mill through hot air.

The above object of the present invention is achieved by the following technical solutions:

the utility model provides a high-efficient coal grinding system, includes the ball mill, the ball mill includes cylinder and driving roll pivoted drive arrangement, the feed end of cylinder is connected with the inlet pipe, and the inlet pipe rotates with the cylinder to be connected, the one end that the cylinder was kept away from to the inlet pipe sets up relevant wind ware, the hot-blast main has been inserted in the cylinder, and the hot-blast main stretches out from the lateral wall of inlet pipe, and the hot-blast main is connected with the outlet duct, and the outlet duct is on a parallel with the axis setting of cylinder, the outlet duct is located the upper portion of cylinder, be connected with the branch pipe of upwards towards the cylinder inner wall on the outlet duct, the branch pipe have a plurality ofly and.

Through adopting above-mentioned technical scheme, when the air seal machinery is connected on the inlet pipe, the hot-blast air of sending into in the cylinder through the hot-blast main can only keep away from the feed end to the cylinder and flow, thereby can carry hot-blast area buggy, make buggy outflow cylinder, at the in-process that gets into the crocus, hot-blast air flows in the outlet duct through the hot-blast main, the branch pipe outflow on the rethread outlet duct, because the tip of branch pipe is towards the inner wall of cylinder, thereby hot-blast inner wall to the cylinder blows, the outlet duct sets up along the length direction of cylinder, bond on the cylinder inner wall and have behind the wet raw coal, hot-blast can be to the pertinence heating of wet raw coal, make the raw coal dry and from the cylinder inner wall drop down, and then improve the crocus efficiency of raw coal.

The invention is further configured to: the included angle between the radial line of the connecting point of the branch pipe and the hot air pipe, which is crossed in the center of the roller, and the length direction of the branch pipe is an acute angle, and the inclination direction of the branch pipe is opposite to the rotation direction of the roller.

Through adopting above-mentioned technical scheme, the branch pipe slope sets up to the incline direction that makes the branch pipe is opposite with the direction of rotation of cylinder, thereby when rotating opposite with the air current that the branch pipe blew off and the cylinder, can increase hot-blast power of blowing, further improves the blow off to the raw coal on the cylinder inner wall.

The invention is further configured to: the side wall of the branch pipe is provided with two rows of branch holes, each row of branch holes are uniformly distributed along the length direction of the branch pipe, the two rows of branch holes are arranged in an upward V shape, and the axes of the two rows of branch holes are positioned on the plane where the branch pipes are positioned.

Through adopting above-mentioned technical scheme, set up two rows of branch holes on the branch pipe lateral wall, branch hole is along the length direction evenly distributed of branch pipe, makes the gas distribution that the branch pipe flows between two adjacent branch pipes to the air current that makes the branch hole outflow can be weathered the raw coal on the cylinder inner wall of position between two branch pipes.

The invention is further configured to: the position that the hot-blast main is located the feeding tube outside is connected with the air hose, and the hot waste gas of cement production is intraductal in the hot-blast, be compressed air in the air hose, all be provided with the valve of adjustable aperture on hot-blast main and the air hose.

By adopting the technical scheme, the air pipe is connected to the hot air pipe, hot waste gas generated in cement production flows through the hot air pipe, the air pipe flows through compressed air, and the valve opening degree on the hot air pipe and the air pipe is adjusted, so that the temperature of hot air entering the roller is controlled.

The invention is further configured to: the roller type roller is characterized in that the number of the air outlet pipes is at least two, a U-shaped pipe is arranged between the two air outlet pipes, two ends of the U-shaped pipe are respectively communicated with the two adjacent air outlet pipes, the central line of the middle part of the U-shaped pipe is overlapped with the central line of the roller, a support is arranged in the middle part of the U-shaped pipe and fixed on the inner wall of the roller, and the support is rotatably connected with the middle part of the U-shaped pipe.

Through adopting above-mentioned technical scheme, the outlet duct sets up two at least to through the U-shaped pipe intercommunication, be provided with the support at the middle part of U-shaped pipe, the support is fixed on the inner wall of cylinder, and the middle part and the support of U-shaped pipe rotate to be connected, thereby can support the outlet duct through the support.

The invention is further configured to: the middle part of U-shaped pipe is provided with the bearing, and the bearing includes inner circle, outer lane and roller, the outer lane is fixed with the support, the inner circle is fixed with the U-shaped pipe, all set up three mutually corresponding annular on the outer wall of inner circle and on the inner wall of outer lane, two annuluses that are located the inner circle both ends are along with being provided with the round respectively the roller, the intercommunicating pore has been seted up on the lateral wall of U-shaped pipe, the intercommunicating pore with be located the annular intercommunication in the middle of the inner circle.

By adopting the technical scheme, when hot air flows out from the position of the communicating hole, the hot air enters the annular groove at the middle position, and the rollers are arranged between the inner ring and the outer ring, so that the hot air flows out from the gap between the inner ring and the outer ring, the hot air flow is used for cleaning the inside of the bearing, and the service life of the bearing is prolonged.

The invention is further configured to: the driving device comprises a driving motor, a speed reducer, a driving gear and a driven gear, the driving gear is coaxially fixed at the output end of the speed reducer, the driven gear is installed on the outer wall of the roller, and the output end of the driving motor is coaxially fixed at the input end of the speed reducer.

Through adopting above-mentioned technical scheme, driving motor drives the reduction gear, and the reduction gear passes through the driving gear and drives driven gear to make driven gear drive cylinder rotate.

The invention is further configured to: a plurality of material shifting plates are uniformly distributed on the inner wall of the roller along the circumferential direction of the roller, the material shifting plates all point to the central line of the roller, and a filter screen is arranged at the discharge end of the roller.

Through adopting above-mentioned technical scheme, be provided with a plurality of switch-plates on the inner wall of cylinder, the switch-plate can be stirred the raw coal in the cylinder, makes the crocus efficiency of raw coal higher, sets up the filter screen at the discharge end of cylinder, and the filter screen can once filter the buggy after the crocus.

The invention is further configured to: the discharge end of the roller is connected with a powder concentrator, the powder concentrator is connected with a dust filter, a slag outlet of the powder concentrator is connected with a conveying belt, and the tail end of the conveying belt is communicated to an inlet of an air seal device.

Through adopting above-mentioned technical scheme, the selection powder machine is connected to the discharge end of cylinder, and the selection powder machine passes through the conveyer belt to the buggy of great granule and carries the cylinder again in to further carry out the crocus with the buggy of great granule, make the buggy reach qualified particle diameter.

In summary, the invention includes at least one of the following beneficial technical effects:

1. when the air seal machine is connected to a feeding pipe, hot air fed into the roller through the hot air pipe can only flow to the position, far away from the feeding end, of the roller, so that the hot air can carry pulverized coal to be conveyed, the pulverized coal flows out of the roller, in the process of entering pulverized coal, the hot air flows into the air outlet pipe through the hot air pipe and flows out through the branch pipe on the air outlet pipe, the end part of the branch pipe faces towards the inner wall of the roller, so that the hot air blows towards the inner wall of the roller, the air outlet pipe is arranged along the length direction of the roller, after wet raw coal is bonded on the inner wall of the roller, the hot air can heat the wet raw coal in a targeted manner, the raw coal is dried and falls off from the inner wall of the roller, and the pulverized coal efficiency is improved;

2. the branch pipe is obliquely arranged, and the oblique direction of the branch pipe is opposite to the rotating direction of the roller, so that when the airflow blown out from the branch pipe is opposite to the rotation of the roller, the blowing force of hot air can be increased, and the blowing-off of raw coal on the inner wall of the roller is further improved;

3. the hot air pipe is connected with an air pipe, hot waste gas generated in cement production flows through the hot air pipe, the air pipe flows through compressed air, and the valve opening degree on the hot air pipe and the air pipe is adjusted, so that the temperature of hot air entering the roller is controlled.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the overall structure of the ball mill;

FIG. 3 is a schematic view of the inner structure of the drum;

FIG. 4 is a schematic view of a full-section structure of a branch pipe;

fig. 5 is a schematic view of a connection structure of a bearing and a U-shaped pipe.

In the figure, 1, a ball mill; 11. a drum; 12. a drive device; 121. a drive motor; 122. a speed reducer; 123. a driving gear; 124. a driven gear; 13. a frame; 14. a kick-out plate; 15. a filter screen; 2. a feed pipe; 21. a wind seal machine; 22. feeding into a hopper; 23. a raw coal bunker; 24. a conveying device; 3. selecting a powder machine; 31. a conveyor belt; 32. a dust filter; 4. a hot air pipe; 41. an air tube; 42. a butterfly valve; 5. an air outlet pipe; 6. a U-shaped tube; 7. a branch pipe; 71. a branch hole; 8. a support; 9. a bearing; 91. an inner ring; 92. an outer ring; 93. a roller; 94. a ring groove; 95. and a communicating hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the high-efficiency coal grinding system disclosed by the invention comprises a ball mill 1, wherein the ball mill 1 comprises a roller 11, the two ends of the roller 11 are respectively a feeding end and a discharging end, the feeding end of the roller 11 is connected with a feeding pipe 2, the feeding pipe 2 is in an L shape, one end of the feeding pipe 2 is rotatably connected with the roller 11, the other end of the feeding pipe 2 is vertically arranged and connected with an air-seal device 21, an inlet of the air-seal device 21 is provided with a feeding hopper 22, the feeding hopper 22 is vertically arranged, a conveying device 24 is arranged above the feeding hopper 22, the tail end of the conveying device 24 is connected with the feeding hopper 22, the initial end of the conveying device 24 is connected with a raw coal bin 23, the raw coal in the raw coal bin 23 is conveyed into the feeding hopper 22 through the conveying device 24, the raw coal enters the roller 11 through the air-seal device 21 and the feeding pipe 2, a plurality of grinding balls are arranged in the roller 11, the raw coal entering into the roller 11 is ground through the grinding balls, the discharge end of the roller 11 is connected with a powder concentrator 3, the coal powder flowing out of the outlet of the powder concentrator 3 is qualified coal powder filtered out, the coal powder with larger particles flowing out of the slag hole of the powder concentrator 3 is provided with a conveyer belt 31 at the slag hole of the powder concentrator 3, the tail end of the conveyer belt 31 is communicated with the inlet of the feeding hopper 22, the conveyer belt 31 conveys the coal powder with larger particles into the feeding hopper 22, so that the coal powder with larger particles is recycled, the outlet of the powder concentrator 3 is connected with a dust filter 32, and the qualified coal powder is collected by the dust filter 32.

Referring to fig. 2, a driving device 12 is disposed at one end of a drum 11, the driving device 12 includes a driving motor 121, a speed reducer 122, a driving gear 123 and a driven gear 124, the driving motor 121 is connected to a frame 13 at two ends of the drum 11, the drum 11 is rotatably connected to the frame 13, the speed reducer 122 is fixed to the frame 13, the driving motor 121 is fixed to the speed reducer 122, an output end of the driving motor 121 is coaxially fixed to an input end of the speed reducer 122, an output end of the speed reducer 122 is coaxially fixed to the driving gear 123, the driven gear 124 is fixed to an outer wall of the drum 11, an axis of the driven gear 124 coincides with an axis of the drum 11, the drum 11 is horizontally disposed, the driven gear 124 is engaged with the driving gear 123, the driving gear 123 is driven by the driving motor 121 through the speed reducer 122, and the driving gear 123 drives the driven gear 124 to rotate, so that the drum 11 rotates on the frame 13. Be provided with a plurality of switch-plates 14 in the inside of cylinder 11, a plurality of switch-plates 14 are along the circumference evenly distributed of cylinder 11, switch-plates 14 are fixed on the inner wall of cylinder 11, and switch-plates 14 keep away from the directional central line of cylinder 11 of one side of cylinder 11 inner wall, make switch-plates 14 set up along the radial line of cylinder 11, at cylinder 11 pivoted in-process, the ball moves in cylinder 11, and can be higher with the height that the ball promoted through switch-plates 14, improve the crocus efficiency to the raw coal.

Referring to fig. 2, a hot air pipe 4 is disposed in the drum 11, a center line of the hot air pipe 4 coincides with a center line of the drum 11, the hot air pipe 4 is inserted into the drum 11 from a feeding end of the drum 11, one end of the hot air pipe 4 located outside the drum 11 extends out from an outer sidewall of the feeding pipe 2, one end of the hot air pipe 4 located outside the drum 11 is connected with an air pipe 41, the air pipe 41 is communicated with the hot air pipe 4, the hot air pipe 4 is connected with a butterfly valve 42 with an adjustable opening degree, and the air pipe 41 is also connected with the butterfly valve 42 with an adjustable opening degree. The butterfly valves 42 on the hot blast pipe 4 and the air pipe 41 can be replaced with ball valves. The hot air flowing into the hot air pipe 4 is waste hot air in the cement production process, and the air pipe 41 is compressed air. The temperature of the hot air blown into the drum 11 is adjusted by controlling the flow rate of the air in the hot air duct 4 and the air duct 41.

Referring to fig. 2 and 3, one end of the hot air duct 4 located in the drum 11 is connected with at least two air outlet pipes 5, the two air outlet pipes 5 are distributed in the length direction of the drum 11, the two air outlet pipes 5 are located on the same straight line, a U-shaped pipe 6 is arranged between the two air outlet pipes 5, two ends of the U-shaped pipe 6 are respectively communicated with the two air outlet pipes 5, and the two air outlet pipes 5 can be communicated through the U-shaped pipe 6. The air outlet pipe 5 is positioned above the central line of the roller 11. Be connected with a plurality of branch pipes 7 on the outlet duct 5, a plurality of branch pipes 7 are along the length direction evenly distributed of outlet duct 5, and a plurality of branch pipes 7 all communicate with outlet duct 5, and branch pipe 7 perpendicular to outlet duct 5 sets up to a plurality of branch pipes 7's orientation is the same. The length direction of the branch pipe 7 is arranged at an acute angle with the radial line from the center of the roller 11 to the intersection point of the branch pipe 7 and the air outlet pipe 5, and the inclination direction of the branch pipe 7 is opposite to the rotation direction of the roller 11. Since the hot wind flows out from the branch pipes 7, the end portions of the branch pipes 7 face upward toward the inner wall of the drum 11, so that the hot wind blows off the raw coal adhered to the inner wall of the drum 11, and since the rotation direction of the drum 11 is opposite to the inclination direction of the branch pipes 7, the blowing force of the hot wind to the inner wall of the drum 11 can be further increased.

Referring to fig. 3 and 4, in order to subject the inner wall of the drum 11 between two adjacent branch pipes 7 to the blowing force of hot air, two rows of branch holes 71 are formed in the side wall of the branch pipe 7, each row of branch holes 71 is uniformly distributed along the length direction of the branch pipe 7, the two rows of branch holes 71 are arranged in an upward V shape, the axes of the two rows of branch holes 71 are all located on a plane where the center lines of the plurality of branch pipes 7 are located, and the hot air in the branch holes 71 blows against the inner wall of the drum 11 between the two branch pipes 7, so that the whole inner wall of the drum 11 can be cleaned by the hot air.

Referring to fig. 2 and 3, in order to stabilize the connection of the air outlet pipe 5 in the drum 11, a bracket 8 is provided at the middle of the drum 11, the bracket 8 is located at the middle position of the U-shaped pipe 6, and the bracket 8 is fixed on the inner wall of the drum 11. Be provided with filter screen 15 at the discharge end of cylinder 11, filter screen 15 is fixed on the inner wall of cylinder 11, all is provided with bearing 9 in the middle part of U-shaped pipe 6 and the middle part of filter screen 15, is connected with U-shaped pipe 6 through bearing 9, makes the both ends of outlet duct 5 support, reduces the deformation of outlet duct 5. Combine fig. 5, the central line at the middle part of the U-shaped pipe 6 coincides with the central line of the drum 11, the bearing 9 includes an inner ring 91, an outer ring 92 and a roller 93, the outer ring 92 is fixed with the support 8, the inner ring 91 is fixed with the U-shaped pipe 6, three mutually corresponding ring grooves 94 are provided on the outer wall of the inner ring 91 and on the inner wall of the outer ring 92, two ring grooves 94 at both ends of the inner ring 91 are provided with a circle along with the roller 93, a communication hole 95 is provided on the side wall of the U-shaped pipe 6, and the communication hole 95 is communicated with the ring groove 94 in the middle of the inner ring 91. Hot air enters the middle ring groove 94 from the communicating hole 95 and then flows out through the gap between the inner ring 91 and the outer ring 92, so that the coal dust can be reduced from entering the gap between the inner ring 91 and the outer ring 92, and the abrasion of the bearing 9 is reduced.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. A high-efficiency coal grinding system comprises a ball mill (1), wherein the ball mill (1) comprises a roller (11) and a driving device (12) for driving the roller (11) to rotate, and is characterized in that: the feeding end of the roller (11) is connected with a feeding pipe (2), the feeding pipe (2) is rotatably connected with the roller (11), one end, far away from the roller (11), of the feeding pipe (2) is provided with a related air blower (21), a hot air pipe (4) is inserted into the roller (11), the hot air pipe (4) extends out of the side wall of the feeding pipe (2), the hot air pipe (4) is connected with an air outlet pipe (5), the air outlet pipe (5) is arranged in parallel to the axis of the roller (11), the air outlet pipe (5) is positioned at the upper part of the roller (11), the air outlet pipe (5) is connected with a plurality of branch pipes (7) which upwards face the inner wall of the roller (11), the branch pipes (7) are communicated with the air outlet pipe (5), and the branch pipes (7) are uniformly distributed along the length direction of the air outlet pipe (5);

the side wall of the branch pipe (7) is provided with two rows of branch holes (71), each row of branch holes (71) are uniformly distributed along the length direction of the branch pipe (7), the two rows of branch holes (71) are arranged in an upward V shape, and the axes of the two rows of branch holes (71) are positioned on the plane where the branch pipes (7) are positioned.

2. The high efficiency coal grinding system of claim 1, wherein: the included angle between the radial line of the connecting point of the branch pipe (7) and the hot air pipe (4) passing through the center of the roller (11) and the length direction of the branch pipe (7) is an acute angle, and the inclination direction of the branch pipe (7) is opposite to the rotation direction of the roller (11).

3. The high efficiency coal grinding system of claim 1, wherein: the position that hot-blast main (4) are located outside inlet pipe (2) is connected with air hose (41), is the hot waste gas of cement manufacture in hot-blast main (4), be compressed air in air hose (41), all be provided with the valve of adjustable aperture on hot-blast main (4) and air hose (41).

4. The high efficiency coal grinding system of claim 1, wherein: the roller type air conditioner is characterized in that the number of the air outlet pipes (5) is at least two, a U-shaped pipe (6) is arranged between the two air outlet pipes (5), two ends of the U-shaped pipe (6) are respectively communicated with the two adjacent air outlet pipes (5), the central line of the middle of the U-shaped pipe (6) is overlapped with the central line of the roller (11), a support (8) is arranged in the middle of the U-shaped pipe (6), the support (8) is fixed on the inner wall of the roller (11), and the support (8) is rotatably connected with the middle of the U-shaped pipe (6).

5. The high-efficiency coal grinding system according to claim 4, wherein: the middle part of U-shaped pipe (6) is provided with bearing (9), and bearing (9) are including inner circle (91), outer lane (92) and roller (93), outer lane (92) are fixed with support (8), inner circle (91) are fixed with U-shaped pipe (6), all seted up three annular (94) that correspond each other on the outer wall of inner circle (91) and on the inner wall of outer lane (92), be located two annular (94) at inner circle (91) both ends along being provided with the round respectively with roller (93), intercommunicating pore (95) have been seted up on the lateral wall of U-shaped pipe (6), intercommunicating pore (95) with be located annular (94) in the middle of inner circle (91) intercommunication.

6. The high efficiency coal grinding system of claim 1, wherein: the driving device (12) comprises a driving motor (121), a speed reducer (122), a driving gear (123) and a driven gear (124), the driving gear (123) is coaxially fixed at the output end of the speed reducer (122), the driven gear (124) is installed on the outer wall of the roller (11), and the output end of the driving motor (121) is coaxially fixed at the input end of the speed reducer (122).

7. The high efficiency coal grinding system of claim 6, wherein: a plurality of material shifting plates (14) are uniformly distributed on the inner wall of the roller (11) along the circumferential direction of the roller (11), the material shifting plates (14) all point to the central line of the roller (11), and a filter screen (15) is arranged at the discharge end of the roller (11).

8. The high efficiency coal grinding system of claim 1, wherein: the discharge end of the roller (11) is connected with a powder concentrator (3), the powder concentrator (3) is connected with a dust filter (32), a slag outlet of the powder concentrator (3) is connected with a conveying belt (31), and the tail end of the conveying belt (31) is communicated to an inlet of the air seal machine (21).