CN201026458Y - New Limestone Powder Preparation System - Google Patents

Abstract

A new limestone powder preparation system, in which a pre-grinder is added before the high-fine mill. The limestone raw material output from the collecting hopper enters the pre-grinder through the vibrating feeder and the belt conveyor, and the powder at the outlet of the pre-mill enters the high-fine mill through the bucket elevator, transfer warehouse, electronic measuring belt scale, and belt conveyor , The fine powder discharged from the high-fine mill enters the powder classifier through the air chute and bucket elevator, and the qualified fine powder after sorting enters the finished product warehouse, and the unqualified coarse powder is fed back to the high-fine mill for regrinding. The utility model has the advantages of simple system, small occupied area, low failure rate, easy operation and maintenance, low production cost, high fine powder content and good desulfurization effect.

Description

New Limestone Powder Preparation System

Technical field:

The utility model relates to a material preparation system, in particular to a limestone powder preparation system for a power plant desulfurizer.

Background technique:

In the "boiler flue gas desulfurization" environmental protection project of thermal power plants, the material used as desulfurizer is mainly limestone powder, and the preparation of limestone powder refers to the crushed stone in the quarry, which is grinded by professional machines to make it into Reach a certain fineness of powder. The traditional limestone powder preparation system is divided into "wet method" and "dry method". Whether the equipment is domestic or imported, the traditional wet system has the disadvantages of low output per unit, high equipment cost, and high unit product cost; although the traditional dry system has greatly reduced the cost compared with the wet system, but There is still the risk of low output and unstable quality per unit hour.

Invention content:

The technical problem to be solved by the utility model is: to solve the problems existing in the above-mentioned prior art, and to provide a simple system, stable production, low cost, greatly reduced total energy consumption, small system footprint, low failure rate, easy Operation and maintenance, a new limestone powder preparation system that greatly increases the fine powder content of the high-fine grinding powder and enhances the desulfurization effect.

The technical solution adopted by the utility model is: this new limestone powder preparation system has a high-fine mill, a powder separator, and the output of the high-fine mill is connected to the powder separator. The utility model is characterized in that: The input end is also equipped with a pre-grinder.

In the above technical scheme, the output of the limestone raw material from the hopper is conveyed by the vibrating feeder and the belt conveyor and then enters the feed inlet of the pre-mill, and the powder output from the outlet of the pre-mill passes through the bucket elevator, transfer The warehouse, electronic metering belt scale, and belt conveyor enter the feed port of the high-fine mill, and the fine powder output from the discharge port of the high-fine mill enters the feed port of the powder separator through the air chute and bucket elevator. The fine powder outlet of the powder separator outputs qualified fine powder into the finished product warehouse, and the coarse powder outlet of the powder classifier outputs unqualified coarse powder, which is fed back to the feed port of the high-fine mill through the chute.

In the above technical solution, the feeding box of the vibrating feeder is installed obliquely, and the material is fed from above. The end of the feeding box is rigidly equipped with a vibration motor, and the vibration motor drives the eccentric wheel to rotate to generate vibration. The support is connected to the frame, and the materials in the feeding box fall evenly from the outlet.

In the above technical solution, the pre-grinder is a vertical mill with a drive motor, transmission and deceleration system installed on the upper part. The motor drives the main shaft of the reducer pre-grinder to rotate through the pulley and the transmission belt, and three frustum-shaped cones are connected and fixed on the main shaft. The inner wall of the pre-mill casing is fixed with a liner, and a certain gap is maintained between the frustum-shaped roller and the liner. There is a mounting bracket on the pre-mill casing, the upper part of the casing has a feed port, and the bottom of the casing has Outlet. When the main shaft rotates, the frustum-shaped roller not only revolves around the center of the main shaft, but also rotates due to the friction between the material and the lining plate. The liner is crushed by continuous rolling, and the pre-crushed coarse stone powder is discharged from the outlet at the lower part of the pre-mill.

In the above technical solution, the bucket elevator is installed with a vertical ring belt in the vertical outer cover, and the ring belt is set on the pulley, and is connected and driven by the drive motor through the belt. There are multiple hoppers installed at equal distances on the endless belt. When the motor drives the endless belt to run, the granular material is fed from the inlet and scraped into the hopper. The hopper is lifted to the top by the belt, and the hopper is at the top. When turning over, the granular material is poured out and discharged from the discharge port.

In the above technical solution, the high-fine mill is composed of a feeding device, a rotary cylinder, a discharge device, a main bearing, a transmission part and a lubrication system, and the drive motor is connected to drive the rotary cylinder through a reduction box, a small gear, and a large gear in the cylinder. , the rotary cylinder is composed of two chambers, separated by a circle of partition boards with holes in the middle, both chambers are equipped with lining boards, the first chamber is equipped with stepped lining boards, and the second chamber is equipped with stepped lining boards. The warehouse is equipped with a tile-shaped liner, and the material is directly fed into the first warehouse in the barrel of the mill through the feed cone. The grinding bodies installed are mainly large and medium-sized grinding bodies, and their functions are mainly impact and grinding. As a supplementary, when the cylinder rotates, the material is crushed under the impact of the grinding body with a large average diameter, such as a steel ball, and the steel ball impacts, collides and grinds with the material during the falling process and the rotation of the cylinder; it is crushed into The material with a certain particle size enters the second warehouse through the slit of the partition plate, where the material is further pulverized and ground by the grinding body with a smaller average diameter, such as steel balls, and passes through the discharge grating plate after reaching a certain fineness. , and finally discharged from the mill through the discharge device. The end of the high-fine mill is connected to a dust collector with a large air volume. The suction airflow of the dust collector provides power for the flow of materials.

In the above technical solution, the air chute is composed of an upper chute and a lower chute. A filter layer is installed between the upper chute and the lower chute. The filter layer only passes through air and does not filter material powder. The air chute is installed obliquely, and the material passes through the air chute. The high-end feed inlet feeds into the upper groove of the air chute, the external compressed air is connected to the compressed air inlet of the air chute, and enters the lower groove, and the compressed air penetrates the filter layer and enters the upper groove of the air chute, entraining the upper groove The powdery material flows in the downstream direction, that is, the direction of the low end.

In the above technical solution, the powder separator is a high-efficiency rotor type powder separator. The rotor and the drip plate are installed in the casing. The rotor is connected and driven by a variable speed motor through large and small gears. The upper end of the casing has a feeding port, and the rotor has a fine powder The collecting hopper is connected to the fine powder outlet at the bottom of the casing, the coarse powder outlet is provided on the lower side of the casing, and a circulating fan is installed beside the casing, and the circulating air enters the powder classifier from a tangential direction. The adjustable variable speed motor drives the rotor of the powder separator to rotate at high speed. When the powdery material is fed into the powder separator from the upper part, the larger particles in the material are thrown far away by the rotor and collected together along the drip plate. The powder is discharged from the mouth. Smaller particles in the material are thrown closer by the rotor, collected together by the collecting hopper, and discharged from the fine powder outlet. The circulating air provided by the fan system enters the powder selection machine from the tangential direction, and together with the wind field stirred by the rotor, it forms a classification circle. Since the rotor speed is adjustable, the fineness of the classification is adjustable.

The originality of the utility model introduces the pre-grinding machine to pre-grind the limestone raw material (particle size ≤ 40mm), and then feed the crushed limestone (average particle size ≤ 2mm) into the high-fine mill for grinding , the output of the high-fine mill is sent to the high-efficiency powder separator for sorting, the selected qualified micro-powder (≤45μm) is sent to the finished product warehouse, and the unqualified powder is taken out by the chute and sent back to the high-fine mill for regrinding, so , this system is also referred to as the "pre-grinding + high-fine grinding + powder selection" system. The pre-grinding machine of the utility model grinds the particle size of the input material ≤ 40mm into an average particle size of ≤ 2mm, and its function is to transfer the coarse grinding task of the traditional high-fine mill 1 chamber to the column mill outside the mill. , so that the stand-alone production capacity of the high-fine mill is increased by 20%, the system production is more stable, and the total energy consumption of the system is reduced (more than 20%), which effectively overcomes the current domestic limestone pulverization system. The disadvantages of low and unstable quality. The high-fine mill grinding system adopting the pre-grinding of the utility model is not only simple and smooth, and occupies a small area, but also has a low failure rate of the system, is easy to operate and maintain, and reduces production costs. The fine powder content of the ground powder is beneficial to the enhancement of the desulfurization effect.

Description of drawings:

Fig. 1 is the structural representation of the utility model

Figure 2 is a schematic diagram of the structure of the vibrating feeder

Figure 3 is a schematic diagram of the structure of the pre-mill

Figure 4 is a schematic diagram of the structure of the bucket elevator

Figure 5 is a schematic diagram of the structure of the high-fine mill

Figure 6 is a schematic diagram of the structure of the air chute

Figure 7 is a schematic diagram of the structure of a high-efficiency powder separator

Detailed ways:

Referring to Fig. 1, this limestone powder prepares new system, has high-fine mill 9, powder classifier 13, and high-fine mill 9 output connects powder selector 13, and the feature of the present utility model is: in the high-fine mill 9 The input end is also equipped with a pre-grinder 4 . Limestone raw material is fed into the feed port of the pre-mill 4 after being transported by the vibrating feeder 2 and the belt conveyor 3, and the powder output from the discharge port of the pre-mill 4 passes through the bucket elevator 5, The transfer warehouse 6, the electronic metering belt scale 7, and the belt conveyor 8 enter the feed port of the high-fine mill 9, and the fine powder output from the discharge port of the high-fine mill 9 passes through the air chute 10, the dust collector 11, and the bucket elevator The machine 12 enters the feed port of the powder separator 13, the fine powder outlet of the powder separator 13 outputs qualified fine powder and enters the finished product warehouse 14, and the coarse powder outlet of the powder separator 13 outputs unqualified coarse powder, which is fed back to the high-fine mill through the chute 15 Machine 9 feeding ports.

Referring to Figure 2, the feeding box 16 of the vibrating feeder 2 is installed obliquely, and the material is fed from above. The end of the feeding box 16 is rigidly equipped with a vibration motor 17, and the vibration motor 17 drives the eccentric wheel to rotate to generate vibration. The feeding box 16 is connected Spring 18, and is connected on the frame by spring 18 supports, and the material in the feeding box 16 falls evenly from discharge opening 19.

Referring to Fig. 3, pre-grinder 4 is a kind of vertical mill, drive motor 20, transmission and deceleration system are installed on the top, motor drives the main shaft of pre-grinder to rotate through reducer, belt pulley, transmission belt 21, connects and fixes three on the main shaft A frustum-shaped roller 22, a lining plate is fixed on the inner wall of the pre-mill casing 23, a certain gap is maintained between the frustum-shaped roller and the lining plate, the pre-mill casing 23 has a mounting bracket 24, and the upper part of the casing has an advanced The feed port 25 has a discharge port 26 at the bottom. When the main shaft rotates, the frustum-shaped roller 22 not only revolves around the axis of the main shaft, but also forms a self-rotation due to the friction between the material and the lining plate. It is crushed by continuous rolling with the liner, and the pre-crushed coarse stone powder is discharged from the discharge port at the lower part of the pre-mill.

Referring to Fig. 4 , the bucket elevator 5 is installed with an upright endless belt 28 inside the upright outer cover 27, the endless belt 28 is set on the pulley 29, the driving motor 30 is connected to drive the endless belt 28 through the belt, and there is a discharge port 31 on the upper side of the upright outer cover. There is a feeding port 32 on one side of the lower end of the upright outer cover, and a plurality of hoppers 33 are equidistantly arranged on the endless belt 28. When the motor drives the endless belt to run, after the granular material is fed from the feeding port, it is scraped into the hopper. As the hopper is lifted to the top by the belt, when the hopper turns over at the top, the granular material is poured out and discharged from the discharge port.

Referring to Fig. 5, the high-fine mill 9 is composed of a feeding device 34, a rotating cylinder 35, a discharging device 36, a main bearing 37, a transmission part and a lubrication system, and a driving motor 38 passes through a reduction box 39, a pinion 40, and The large gear 41 is connected to the transmission rotary cylinder 35, and the rotary cylinder 35 is composed of two compartments, separated by a circle of perforated compartment plates in the middle, liners are installed in the two compartments, and the first compartment Ladder-shaped liners are installed in the second chamber, and tile-shaped liners are installed in the second chamber. The materials are directly fed into the first chamber in the barrel of the mill through the feed cone. The grinding bodies 42 installed are large and medium-sized grinding bodies. Mainly, its function is mainly impact and supplemented by grinding. When the cylinder rotates, the material is crushed under the impact of the grinding body 42 with a large average diameter, such as a steel ball. The steel ball is in the process of falling and the cylinder rotates. Impact, collide and grind with the material; the material that is crushed into a certain size passes through the gap of the compartment plate and enters the second warehouse, where the material is further pulverized and ground by the grinding body with a smaller average diameter, such as steel balls After reaching a certain fineness, it passes through the discharge grating plate, and finally is discharged from the mill through the discharge device. The tail end of the high-fine mill is connected with a dust collector with a large air volume. The suction airflow of the dust collector provides a good guarantee for the flow of materials power.

Referring to Fig. 6, the air chute 10 is composed of an upper trough 43 and a lower trough 44. A filter layer 45 is installed between the upper trough 43 and the lower trough 44. The filter layer 45 only passes through air and does not filter material powder. The air chute 10 is inclined Installation, the material is fed into the upper trough 43 of the air chute from the high-end feed port 46 of the air chute, the external compressed air is connected to the compressed air inlet 47 of the air chute, and enters the lower trough 44, and the compressed air enters through the filter layer The upper chute of the air chute entrains the powdery material in the upper chute to flow in the downstream direction, that is, the lower end direction.

Referring to Fig. 7, the powder separator 13 is a high-efficiency rotor-type powder separator. A rotor 49 and a drip plate 50 are installed in the casing 48. The rotor 49 is connected and driven by a variable speed motor 51 through a large gear 52 and a small gear 53. The casing 48 There is a feed inlet 54 at the upper end, a fine powder collecting bucket 55 is provided under the rotor, and it is connected with a fine powder outlet 56 at the bottom of the casing, a coarse powder outlet 57 is provided on the lower side of the casing, and a circulating fan 58 is installed beside the casing. The circulating air enters the powder classifier from the tangential direction. The adjustable variable speed motor 51 drives the rotor 49 of the powder separator to rotate at a high speed. When the powdery material is fed into the powder separator from the upper part, the larger particles in the material are thrown far away by the rotor and collected together along the drip plate 50. , discharged from the coarse powder outlet. Smaller particles in the material are thrown closer by the rotor, collected together by the collecting hopper, and discharged from the fine powder outlet. The circulating air provided by the fan system enters the powder selection machine from the tangential direction, and together with the wind field stirred by the rotor, it forms a classification circle. Since the rotor speed is adjustable, the fineness of the classification is adjustable.

Claims (6)

1. A new system for preparing limestone powder has a high-fine mill, a powder classifier, and the output of the high-fine mill is connected to the powder selector, and is characterized in that a pre-grinder is also installed at the input end of the high-fine mill. 2. The new system for preparing limestone powder according to claim 1 is characterized in that the output of the collection hopper of the limestone raw material enters the feed inlet of the pre-mill through a vibrating feeder and a belt conveyor, and the discharge of the pre-mill The powder output from the outlet enters the inlet of the high-fine mill through the air chute, bucket elevator, transfer warehouse, electronic metering belt scale, and belt conveyor, and the fine powder output from the outlet of the high-fine mill passes through the air chute , The bucket elevator enters the feed port of the powder classifier, the fine powder outlet of the powder classifier outputs qualified fine powder and enters the finished product warehouse, the coarse powder outlet of the powder classifier outputs unqualified coarse powder, which is fed back to the high-fine mill through the chute. feed port. 3. The new limestone powder preparation system according to claim 2, characterized in that the feeding box of the vibrating feeder is installed obliquely, and the material is fed from above. The end of the feeding box is rigidly equipped with a vibration motor, and the vibration motor drives the eccentric wheel The rotation generates vibration, and the feeding box is connected with a spring, and is connected to the frame by a spring support. 4. The new system for preparing limestone powder according to claim 2 is characterized in that the pre-grinding machine is a vertical mill, and a drive motor, transmission and deceleration system are installed on the top, and the motor is driven by a reducer pulley and a transmission belt so that The main shaft of the pre-mill rotates, and three frustum-shaped rollers are connected and fixed on the main shaft. A liner is fixed on the inner wall of the pre-mill casing, and a certain gap is maintained between the frustum-shaped rollers and the liner. The bracket is installed, the upper part of the casing has a material inlet, and the bottom of the casing has a material outlet. 5. The new limestone powder preparation system according to claim 2, characterized in that the bucket elevator is installed with an upright endless belt in the upright outer cover, and the endless belt is sleeved on the pulley, connected and driven by the drive motor through the belt, and the upper end of the upright outer cover is one There is a discharge port on one side, and a feed port on the lower end side of the vertical outer cover, and multiple hoppers are installed equidistantly on the endless belt. 6. The new limestone powder preparation system according to claim 2, characterized in that the air chute is composed of an upper trough and a lower trough, and a filter layer is installed between the upper trough and the lower trough, and the filter layer only passes through the air and does not penetrate the filtered material For powder, the air chute is installed obliquely. The material is fed from the high-end feed port of the air chute to the upper chute of the air chute, and the external compressed air is connected to the compressed air inlet of the air chute and enters the lower chute.

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