CN111495560A - Static double-grading powder concentrator and semi-final pre-grinding system - Google Patents
Static double-grading powder concentrator and semi-final pre-grinding system Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 237
- 238000000227 grinding Methods 0.000 title claims abstract description 48
- 230000003068 static effect Effects 0.000 title claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 120
- 238000012216 screening Methods 0.000 claims abstract description 34
- 210000001503 joint Anatomy 0.000 claims description 21
- 239000004568 cement Substances 0.000 claims description 19
- 238000005303 weighing Methods 0.000 claims description 10
- 239000011362 coarse particle Substances 0.000 abstract description 10
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/20—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating
- B02C23/22—Adding fluid, other than for crushing or disintegrating by fluid energy after crushing or disintegrating with recirculation of material to crushing or disintegrating zone
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Abstract
The invention discloses a static double-grading powder concentrator and a semi-final pre-grinding system. The powder concentrator is characterized in that an air inlet is formed in the side surface of a shell of the powder concentrator and close to the top of the shell, the interior of the shell is divided into a coarse material screening cavity, a semi-coarse material screening cavity and a fine powder screening cavity by a coarse material flow guide baffle group and a fine powder flow guide baffle group, a material sliding plate group with the top inclined towards the direction of the air inlet is arranged in the coarse material screening cavity, a feeding hole is formed in the shell at the top of the material sliding plate group, and a coarse powder outlet is; a first air outlet is arranged on the shell above the semi-coarse material screening cavity, and a semi-coarse material outlet is arranged on the shell below the bottom of the semi-coarse material screening cavity; a second air outlet is arranged on the shell above the fine powder screening cavity, and a fine powder outlet is arranged on the shell below the bottom of the fine powder screening cavity; the first air outlet and the second air outlet are respectively controlled by valves. The powder selecting machine can be applied to various pre-grinding systems. The powder concentrator provided by the invention is easy to directly transform the existing v-shaped powder concentrator, and can efficiently separate coarse particles, semi-coarse particles and fine powder finished products from materials.
Description
Technical Field
The invention belongs to the cement semi-final pre-grinding process technology, and particularly relates to a static double-grading powder concentrator, a cement roller press semi-final pre-grinding system and a cement vertical mill external circulation semi-final pre-grinding system.
Background
At present, a combined grinding system consisting of roll squeezer pre-grinding and a ball mill is widely adopted in the cement industry for grinding materials such as cement clinker, the materials to be ground are extruded by the roll squeezer and then fed into a V-shaped powder concentrator by a lifting conveyor mechanism for scattering and sorting, coarse materials fall into a loading bin above the roll squeezer and then fed into the roll squeezer for extrusion, fine materials are taken into a cyclone dust collector and collected as semi-finished products to be fed into the ball mill for grinding; the material discharged from the ball mill is sorted by a high-efficiency dynamic powder concentrator, qualified products are collected by a bag dust collector, and coarse powder is returned to the ball mill for grinding. The materials are scattered and sorted by a roller press and a ball mill which are respectively provided with a fan to provide an air source. However, the system has the disadvantages of high power consumption, low yield and the like.
In order to further reduce the power consumption and improve the yield, a part of the materials are extruded by a roller press and then fed into a V-shaped powder concentrator by a lifting conveyor mechanism to be scattered and sorted, coarse materials fall into a load bin above the roller press and then are fed into the roller press to be extruded, the coarse powders and the fine powders are discharged out of the V-shaped powder concentrator together and are carried into another high-efficiency rotor powder concentrator by a cyclone cylinder, the coarse powders after the high-efficiency rotor powder concentrator is winnowed into a ball mill as a semi-finished product to be ground, and the fine powders are collected by the cyclone cylinder and qualified products ground by the ball mill are taken as finished products; the materials discharged from the ball mill are sorted by a high-efficiency dynamic powder concentrator, qualified products are collected by a bag dust collector, coarse powder is returned to the ball mill for grinding, and the materials are scattered and sorted by means of fans respectively arranged on a roller press and the ball mill to provide air sources. As no equipment capable of efficiently separating coarse particles, semi-coarse particles and fine powder finished products in materials simultaneously exists, and the powder selecting process of the system needs to use two series-connected V-shaped powder selecting machines and high-efficiency rotor powder selecting machines, the process flow is complex, the number of equipment is large, the investment is high, and the power consumption is high.
Adopting a vertical mill external circulation semi-final pre-grinding ball mill system, extruding materials by a vertical mill (without a built-in powder concentrator), discharging the materials from the bottom, feeding the materials into a V-shaped powder concentrator by a feeding elevator, scattering and sorting the materials, falling coarse materials into the vertical mill, taking semi-coarse powder and fine powder out of the V-shaped powder concentrator together, taking the semi-coarse powder and the fine powder into another high-efficiency rotor powder concentrator by a cyclone cylinder, feeding the semi-coarse powder which is winnowed by the high-efficiency rotor powder concentrator as a semi-finished product into a ball mill for re-grinding, and taking the fine powder which is collected by the cyclone cylinder and a qualified product which; the material discharged from the ball mill is sorted by a high-efficiency dynamic powder concentrator, qualified products are collected by a bag dust collector, and coarse powder is returned to the ball mill for grinding. The materials are scattered and sorted by a vertical mill and a ball mill which are respectively provided with a fan to provide an air source. As no equipment capable of efficiently separating coarse particles, semi-coarse particles and fine powder finished products in materials simultaneously exists, the powder selecting process of the system also needs to use two V-shaped powder selecting machines and a high-efficiency rotor powder selecting machine which are connected in series, and the defects of complex process flow, more equipment, high investment and high power consumption are inevitably caused.
And a semi-final pre-grinding system is also provided, wherein the application numbers CN201910596233.5 and CN110180664A are that materials discharged from a roller press are screened by a screen, coarse powder returns to the roller press to be continuously ground, semi-coarse powder enters a ball mill to be ground, and fine powder is used as a finished product. The system has simple flow, but has the following defects because the air flow winnowing is not adopted: the production requirement can be met only by adopting an ultra-large sieve, and the powder selection efficiency is low; meanwhile, because the sieve pores are fixed, the particle size of the selected powder particles cannot be adjusted in the production process; in addition, the sieve pores are easy to block; the screen is easy to wear; the production stability control is directly influenced by the aperture change after the screen is worn.
Disclosure of Invention
The invention aims to provide a static double-grading powder concentrator, a cement roller press semi-final pre-grinding system and a cement vertical mill external circulation semi-final pre-grinding system, and aims to overcome the defects of the prior art described in the background technology.
The invention is realized in this way, a kind of static double-classification powder concentrator, this powder concentrator includes the body, this body side and position near the top have air intakes, this body is divided into coarse material screening chamber, half coarse material screening chamber and fine powder screening chamber by coarse material deflector group, fine powder deflector group inside, there are material slide plate groups that the top inclines towards the direction of air intake in the said coarse material screening chamber, there are feed inlets on the body directly over the top of this material slide plate group, there are coarse powder exports on the body directly under the bottom; a first air outlet is formed in the shell above the semi-coarse material screening cavity, and a semi-coarse material outlet is formed in the shell below the bottom of the semi-coarse material screening cavity; a second air outlet is formed in the shell above the fine powder screening cavity, and a fine powder outlet is formed in the shell below the bottom of the fine powder screening cavity;
the top of the shell, which is far away from the air inlet, is provided with an air gathering sleeve, the air gathering sleeve is provided with a main air outlet, the first air outlet and the second air outlet are positioned in the air gathering sleeve, and valves (such as louver valves) used for controlling the sizes of the air outlets of the first air outlet and the second air outlet respectively are arranged in the air gathering sleeve; horizontal airflow of the air inlet is uniformly dispersed and passes through the material sliding plate group and the coarse material flow guide baffle plate group, wherein a part of airflow is discharged from the first air outlet, and the other part of airflow is uniformly dispersed and passes through the fine powder flow guide baffle plate group and then is discharged from the second air outlet.
Preferably, the louver valves are respectively installed on the shells of the first air outlet and the second air outlet, and the louver valves respectively rotate to control the air volume conduction ratio of the first air outlet and the second air outlet.
Preferably, the inclined included angle between the material sliding plate group and the horizontal plane is 50-80 degrees, and the inclined included angle between the coarse material flow guide baffle group and the horizontal plane is 50-90 degrees.
Preferably, the fine powder flow guide baffle group has an included angle of 60-90 degrees with the horizontal inclination.
Preferably, the material sliding plate group, the coarse material flow guide baffle group and the fine powder flow guide baffle group are all linearly stacked by a plurality of rectangular wear-resistant flat plates which are parallel to each other and are equidistantly spaced; wherein the included angle between a flat plate in the material sliding plate group and the horizontal plane is 25-55 degrees; the included angles between the flat plates in the coarse material flow guide baffle group and the fine powder flow guide baffle group and the horizontal plane are 60-90 degrees.
Preferably, the section wind speed of the horizontal airflow of the air inlet passing through the material sliding plate group and the coarse material flow guide baffle group is 4-10 m/s, and the section wind speed of the horizontal airflow passing through the fine powder flow guide baffle group is 2-6 m/s.
The invention further discloses a cement roller press semi-final pre-grinding system, which comprises a feeding hoister, a weighing bin, a roller press, a cyclone, a circulating fan, a finished product conveyor and the powder concentrator; the feeding hoister is in butt joint with a feeding hole of the powder concentrator, a coarse powder outlet of the powder concentrator is connected with an inlet of the weighing bin, an outlet of the weighing bin is in butt joint with an inlet of the roller press, and an outlet of the roller press is in butt joint with an inlet of the hoister; the semi-coarse powder outlet of the powder concentrator is butted with the inlet of the ball mill through a chute; the fine powder outlet of the powder concentrator is butted with a finished product conveyor; the main air outlet of the air collecting sleeve is in butt joint with the air inlet of the cyclone cylinder, the circulating fan and the air inlet of the powder concentrator are in butt joint sequentially through air pipes, and the discharge port of the cyclone cylinder is in butt joint with the finished product conveyor through the chute.
The invention further discloses an external circulation semi-final pre-grinding system of the cement vertical mill, which comprises a feeding hoister, the vertical mill, a rubber belt conveyor, a cyclone, a circulating fan and a finished product conveyor, and is characterized by also comprising the powder concentrator; the feeding elevator is in butt joint with a feeding hole of the powder concentrator, a coarse powder outlet of the powder concentrator is in butt joint with an inlet of the vertical mill, and a material outlet of the vertical mill is in butt joint with a material inlet of the feeding elevator through the rubber belt conveyor; the semi-coarse powder outlet of the powder concentrator is butted with the inlet of the ball mill through a chute; a fine powder outlet of the powder concentrator is butted with a finished product conveyor; the main air outlet of the air collecting sleeve is in butt joint with the air inlet of the cyclone cylinder, the circulating fan and the air inlet of the powder concentrator are in butt joint sequentially through air pipes, and the discharge port of the cyclone cylinder is in butt joint with the finished product conveyor through the chute.
Compared with the defects and shortcomings of the prior art, the invention has the following beneficial effects:
(1) the powder selecting machine can simultaneously and efficiently separate coarse particles, semi-coarse particles and fine powder finished products in materials, greatly simplifies the process flow of cement combined grinding, simplifies the operation control of the device, and also reduces the construction investment and the production operation cost;
(2) the coarse powder outlet, the semi-coarse powder outlet and the fine powder outlet of the powder concentrator are all discharged in a gravity settling mode, and the existing v-shaped powder concentrator adopts airflow carrying-out type discharging, so that the air quantity required by the powder concentrator is reduced by about half under the condition of the same output, the power consumption of a circulating fan can be saved by 40-60%, and the power consumption of a series-connected efficient powder concentrator can be saved, so that the output of a mill is improved, and the power consumption of a grinding process is reduced;
(3) the powder selecting machine technology of the invention is also easy to directly transform the grinding system of the existing v-shaped powder selecting machine, and the pre-grinding system is transformed into a semi-final pre-grinding system, thus improving the output of the grinding system by 20-40%, reducing the power consumption of grinding and generating huge economic benefit;
(4) the powder concentrator has the advantages of simple structure, convenient manufacture, simple production control and easy popularization.
Drawings
FIG. 1 is a schematic diagram of the internal structure of an embodiment of the static double classification powder concentrator of the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of the semi-finished pre-grinding system of the cement roller press of the present invention;
fig. 3 is a schematic structural diagram of an embodiment of the external circulation semi-final pre-grinding system of the cement vertical mill of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 to 3, fig. 1 is a schematic diagram of an internal structure of an embodiment of a static double-classification powder concentrator of the present invention; FIG. 2 is a schematic structural diagram of an embodiment of the semi-finished pre-grinding system of the cement roller press of the present invention; fig. 3 is a schematic structural diagram of an embodiment of the external circulation semi-final pre-grinding system of the cement vertical mill of the invention.
The invention discloses a static double-grading powder concentrator 1, as shown in figure 1, the powder concentrator 1 comprises a shell 1-1, an air inlet 1-2 is arranged on the side surface of the shell 1-1 and close to the top of the shell, the interior of the shell 1-1 is divided into a coarse material screening cavity, a semi-coarse material screening cavity and a fine powder screening cavity by a coarse material flow guide baffle group 1-3 and a fine powder flow guide baffle group 1-4, a material sliding plate group 1-5 with the top inclined towards the direction of the air inlet 1-2 is arranged in the coarse material screening cavity, a feeding port 1-6 is arranged on the shell 1-1 right above the top of the material sliding plate group 1-5, and a coarse powder outlet 1-7 is arranged on the shell 1-1 right below the bottom of the material sliding; a first air outlet 1-8 is arranged on the shell 1-1 above the semi-coarse material screening cavity, and a semi-coarse powder outlet 1-9 is arranged on the shell 1-1 below the bottom; a second air outlet 1-10 is arranged on the shell 1-1 above the fine powder screening cavity, and a fine powder outlet 1-11 is arranged on the shell 1-1 below the bottom;
the top of the shell 1-1 in the direction away from the air inlet 1-2 is provided with an air gathering sleeve 1-12, the air gathering sleeve 1-12 is provided with a total air outlet 1-13, the first air outlet 1-8 and the second air outlet 1-10 are positioned in the air gathering sleeve 1-12, and the air gathering sleeve 1-12 is internally provided with valves (such as a louver valve) 1-14 for controlling the sizes of the air outlets of the first air outlet 1-8 and the second air outlet 1-10 respectively; horizontal airflow from the air inlet 1-2 is uniformly dispersed and passes through the material sliding plate group 1-5 and the coarse material flow guide baffle plate group 1-3, a part of airflow is discharged from the first air outlet 1-8, and the other part of airflow is uniformly dispersed and passes through the fine powder flow guide baffle plate group 1-4 and then is discharged from the second air outlet 1-10.
In the embodiment of the invention, a material sliding plate group 1-5, a coarse material flow guide baffle group 1-3 and a fine powder flow guide baffle group 1-4 are all linearly stacked by a plurality of rectangular wear-resistant flat plates which are parallel to each other and are equidistantly spaced; airflow passing gaps are formed among the rectangular wear-resistant flat plates to guide the trend of the airflow; in addition, the top end of the material sliding plate group 1-5 is positioned under the feeding port 1-6, the bottom end of the material sliding plate group 1-5 is positioned above the coarse powder outlet 1-7, and the top of the material sliding plate group 1-5 inclines towards the air inlet 1-2 according to the trend of air flow and the trend of the combined materials along the material sliding plate group 1-5 under the guidance of gravity.
In the embodiment of the invention, the valves (such as the louver valves) 1 to 14 can respectively control the sizes and the opening and closing conditions of the first air outlets 1 to 8 and the second air outlets 1 to 10 in a mode of rotating the valve plate, so that the air flow velocities and the sizes of the semi-coarse powder screening cavity and the fine powder screening cavity are changed, and finally the particle sizes of the material particles collected by the semi-coarse powder outlet 1 to 9 and the fine powder outlet 1 to 11 are regulated and controlled in real time.
In the practical application process of the invention, materials enter from the feed inlet 1-6, and are impacted and dispersed by each slide carriage of the material slide carriage group 1-5 to slide downwards, the airflow from the air inlet 1-2 is dispersed and passes through the gap between each rectangular wear-resistant flat plate of the material slide carriage group 1-5, then the coarse material screening cavity between the material slide carriage group 1-5 and the coarse material guide baffle plate group 1-3 is used for blowing, dispersing and winnowing the materials, the coarse powder particles have large mass under the action of gravity, and the airflow cannot be blown away, so the coarse powder slides downwards and is discharged from the coarse powder outlet 1-7; the semi-coarse powder and the finished fine powder are carried by the moving airflow to pass through the coarse material flow guide baffle group 1-3 to enter a semi-coarse material screening cavity between the coarse powder flow guide baffle group and the fine powder flow guide baffle group 1-4, and the semi-coarse powder overcomes the influence of the airflow to settle under the action of gravity and is discharged from a semi-coarse powder outlet 1-9; a small part of fine finished product powder is carried by the airflow under the action of the moving airflow, goes out from the first air outlet 1-8 along with the airflow and is collected from the cyclone cylinder through the total air outlet 1-13; most of finished fine powder passes through the fine powder flow guide baffle group 1-4 under the carrying of air flow to reach a fine powder screening cavity between the fine powder flow guide baffle group 1-4 and an end plate of the shell 1-1, and most of fine powder is discharged from a fine powder outlet 1-11 after being settled; a part of the fine powder which is thinner is carried by the airflow and goes out to the cyclone cylinder from the second air outlet 1-10 through the total air outlet 1-13 along with the airflow.
The section wind speed passing through the material chute groups 1-5 and the coarse material flow guide baffle groups 1-3 is improved, and the static double-classification powder concentrator 1 has the following changes: the discharge amount of coarse powder is reduced, and the coarse powder becomes coarse; the total amount of the semi-coarse powder and the finished fine powder is increased, and the whole of the semi-coarse powder and the finished fine powder becomes coarse. And vice versa.
In a further implementation, the valves (e.g., louver valves) 1 to 14 are respectively installed on the housings 1 to 1 of the first outlet 1 to 8 and the second outlet 1 to 10, and the valves (e.g., louver valves) 1 to 14 respectively rotate to control the conduction of the first outlet 1 to 8 and the second outlet 1 to 10 to form an inverse proportion adjustment, for example, the smaller the conduction proportion of the first outlet 1 to 8 is, the larger the conduction proportion of the second outlet 1 to 10 is. This proportional variation facilitates control of the half-meal size and the fine powder size. Increasing the air volume of the first outlet 1-8 by rotating the first outlet and the second outlet valves (for example, louver valves) 1-14 respectively, and decreasing the air volume of the second outlet proportionally will increase the amount of semi-coarse powder, decrease the amount of fine powder, and simultaneously thin the fine powder, or vice versa.
In a further implementation, as a preferred mode according to practical practice, in the embodiment of the present invention, the inclined angle of the material chute groups 1-5 to the horizontal plane is preferably 50 ° to 80 °. The inclined included angle between the coarse material flow guide baffle group 1-3 and the horizontal plane is preferably 50-90 degrees. The included angle between the material sliding plate group 1-5 and the coarse material flow guide baffle group 1-3 and the horizontal plane is set, so that the stability of the air flow direction between the material sliding plate group 1-5 and the coarse material flow guide baffle group 1-3 is facilitated; the included angle of inclination is preferably from 50 to 80 deg., and is preferably arranged in view of a practical balance between the velocity of the gas flow and the size of the material or the rate of descent by gravity. Similarly, in the embodiment of the invention, the included angle between the fine powder flow guide baffle groups 1-4 and the horizontal inclination is 60-90 degrees; the included angle between the flat plate in the material chute groups 1-5 and the horizontal plane is 25-55 degrees; the included angles between the flat plates in the coarse material flow guide baffle group 1-3 and the fine powder flow guide baffle group 1-4 and the horizontal plane are 60-90 degrees; and the section wind speed of the horizontal airflow of the air inlet 1-2 passing through the material sliding plate group 1-5 and the coarse material flow guide baffle plate group 1-3 is 4 m/s-10 m/s, and the section wind speed of the horizontal airflow passing through the fine powder flow guide baffle plate group 1-4 is 2 m/s-6 m/s.
The static double-grading powder concentrator 1 can simultaneously and efficiently separate coarse particles, semi-coarse particles and fine powder finished products in materials, greatly simplifies the technological process of cement combined grinding, simplifies the operation control of devices, and also reduces the construction investment and the production operation cost; in addition, the coarse powder outlet 1-7, the semi-coarse powder outlet 1-9 and the fine powder outlet 1-11 of the static double-grading powder concentrator 1 are all discharged in a gravity settling mode, so that the air volume can be reduced by half under the condition of the same yield, the power consumption of a circulating fan can be saved by 40% -60%, and the power consumption of the high-efficiency powder concentrator 1 connected in series can be saved, so that the yield of a grinding machine is improved, and the power consumption of a grinding process is reduced; in addition, the same key point is that the technology disclosed by the static double-grading powder concentrator 1 is easy to directly transform the grinding system of the existing v-shaped powder concentrator, and the pre-grinding system is transformed into a semi-finished pre-grinding system, so that the yield of the grinding system can be improved by 20-40%, the power consumption of grinding is reduced, and great economic benefit is generated; finally, the powder concentrator 1 has the advantages of simple structure, convenient manufacture, simple production control and easy popularization.
The invention further discloses a cement roller press semi-final pre-grinding system, as shown in fig. 2, the system comprises a feeding elevator 2, a weighing bin 3, a roller press 4, a cyclone 5, a circulating fan 6 and a finished product conveyor 7, and the system also comprises the powder concentrator 1 recorded in the embodiment; wherein, the feeding elevator 2 is butted with a feeding hole 1-6 of the powder concentrator 1, a coarse powder outlet 1-7 of the powder concentrator 1 is connected with an inlet of the weighing bin 3, an outlet of the weighing bin 3 is butted with an inlet of the roller press 4, and an outlet of the roller press 4 is butted with an inlet of the elevator; a semi-coarse powder outlet 1-9 of the powder concentrator 1 is butted with an inlet of a ball mill through a chute; a fine powder outlet 1-11 of the powder concentrator 1 is butted with a finished product conveyor; the total air outlet 1-13 of the air collecting sleeve 1-12 is butted with the air inlet of the cyclone cylinder 5, the circulating fan 6 and the air inlet 1-2 of the powder concentrator 1 are butted through air pipes in sequence, and the discharge port of the cyclone cylinder 5 is butted with a finished product conveyor through a chute.
In the practical application process of the invention, materials to be ground and materials from a roller press 4 are conveyed by a feeding elevator 2 to enter from a feeding port of a static double-classification powder concentrator 1, airflow from a circulating fan 6 enters from an air inlet 1-2 of the static double-classification powder concentrator 1, the airflow is scattered and air-separated by the static double-classification powder concentrator 1, coarse powder enters a weighing bin 3 from a coarse powder outlet 1-7 of the static double-classification powder concentrator 1, and then enters the feeding elevator 2 through the roller press 4; the material from the semi-coarse powder outlet 1-9 of the static double-grading powder separator 1 directly enters a ball mill for grinding through an air locking device; materials from finished product fine powder outlets 1-11 of the static double-grading powder separator 1 are conveyed to a high-efficiency dynamic powder separator or a finished product conveying system of a ball mill system by a finished product conveyor 7 together with finished product fine powder from the cyclone cylinder 5 through an air locking device; the dust-containing gas from the total air outlet 1-13 of the static double-classification powder separator 1 enters a cyclone cylinder 5, the gas in the cyclone cylinder 5 enters the air inlet 1-2 of the static double-classification powder separator 1 again through a circulating fan 6 after gas-solid separation, each point dust-collecting air pipe of the pre-grinding system enters a circulating fan air path system, and a circulating air path negative pressure pipe is connected with a ball mill powder-selecting and dust-collecting system.
In addition, the invention further discloses an external circulation semi-final pre-grinding system of a cement vertical mill, as shown in fig. 3, the system comprises a feeding elevator 2, a vertical mill 8, a cyclone cylinder 5, a belt conveyor 9, a circulating fan 6, a finished product conveyor 7, and the system also comprises the static double-classification powder concentrator 1 described in the above embodiment; wherein, the feeding elevator 2 is butted with a feeding hole 1-6 of the static double-grading powder concentrator 1, a coarse powder outlet 1-7 of the static double-grading powder concentrator 1 is butted with an inlet of the vertical mill, and a material outlet of the vertical mill is butted with a material inlet of the feeding elevator 2; semi-coarse powder outlets 1-9 of the static double-grading powder concentrator 1 are butted with an inlet of a ball mill through a chute; a fine powder outlet 1-11 of the static double-grading powder concentrator 1 is butted with a finished product conveyor; the total air outlet 1-13 of the air collecting sleeve 1-12 is butted with an air inlet of a cyclone cylinder 5, the cyclone cylinder 5, a circulating fan 6 and an air inlet 1-2 of the static double-grading powder concentrator 1 are butted through air pipes in sequence, and a discharge port of the cyclone cylinder 5 is butted with a finished product conveyor through a chute.
In the practical application process of the embodiment of the invention, materials to be ground and materials from a rubber belt conveyor 9 are conveyed by a feeding elevator 2 to enter a feeding hole 1-6 of a static double-classification powder separator 1, airflow from a circulating fan 6 enters from an air inlet 1-2 of the static double-classification powder separator 1, the static double-classification powder separator 1 is used for scattering and winnowing, coarse powder enters a vertical mill from a coarse powder outlet 1-7 of the static double-classification powder separator 1, and the materials from the vertical mill are conveyed to the feeding elevator 2 by the rubber belt conveyor 9; the material from the semi-coarse powder outlet 1-9 of the static double-grading powder separator 1 is directly fed into a ball mill for grinding through an air locking device; materials from finished product fine powder outlets 1-11 of the static double-grading powder separator 1 are conveyed to a high-efficiency dynamic powder separator or a finished product conveying system of a ball mill system by a finished product conveyor 7 together with finished product fine powder from the cyclone cylinder 5 through an air locking device; the dust-containing gas from the total air outlet 1-13 of the static double-grading powder concentrator 1 enters a cyclone 5 for gas-solid separation and then enters a circulating fan 6, dust collecting air pipes at various points of the pre-grinding system are connected to an air path system of the circulating fan, and a negative pressure pipe of the circulating air path is connected to a powder selecting and dust collecting system of the ball mill.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A static double-grading powder concentrator comprises a shell, wherein an air inlet is formed in the side surface of the shell and close to the top of the shell, and the static double-grading powder concentrator is characterized in that the interior of the shell is divided into a coarse material screening cavity, a semi-coarse material screening cavity and a fine powder screening cavity by a coarse material flow guide baffle group and a fine powder flow guide baffle group; a first air outlet is formed in the shell above the semi-coarse material screening cavity, and a semi-coarse material outlet is formed in the shell below the bottom of the semi-coarse material screening cavity; a second air outlet is formed in the shell above the fine powder screening cavity, and a fine powder outlet is formed in the shell below the bottom of the fine powder screening cavity;
the top of the shell, which is far away from the air inlet direction, is provided with an air gathering sleeve, the air gathering sleeve is provided with a main air outlet, the first air outlet and the second air outlet are positioned in the air gathering sleeve, and valves used for controlling the sizes of the air outlets of the first air outlet and the second air outlet are arranged in the air gathering sleeve.
2. The static double-stage powder concentrator as claimed in claim 1, wherein the valves are mounted on the housing of the first outlet and the second outlet, and the rotation of the valves controls the ratio of the first outlet to the second outlet.
3. The static double-classification powder concentrator as claimed in claim 1, wherein the inclined angle between the material chute groups and the horizontal plane is 50-80 °, and the inclined angle between the coarse material guide baffle groups and the horizontal plane is 50-90 °.
4. The static double-classification powder concentrator as claimed in claim 1, wherein the fine powder guide baffle group has an included angle of 60 ° to 90 ° with the horizontal inclination.
5. The static double-classification powder concentrator as claimed in claim 1, wherein the material chute group, the coarse material flow guide baffle group and the fine powder flow guide baffle group are all linearly stacked by a plurality of rectangular wear-resistant flat plates which are parallel to each other and are equidistantly spaced; wherein the included angle between a flat plate in the material sliding plate group and the horizontal plane is 25-55 degrees; the included angles between the flat plates in the coarse material flow guide baffle group and the fine powder flow guide baffle group and the horizontal plane are 60-90 degrees.
6. The static double-classification powder concentrator as claimed in claim 1, wherein the cross-sectional wind speed of the horizontal airflow passing through the material chute group and the coarse material flow guide baffle group at the air inlet is 4m/s to 10m/s, and the cross-sectional wind speed passing through the fine powder flow guide baffle group is 2m/s to 6 m/s.
7. A cement roller press semi-finished pre-grinding system comprises a feeding hoister, a weighing bin, a roller press, a cyclone cylinder, a circulating fan and a finished product conveyor, and is characterized by further comprising a powder concentrator of any one of claims 1 to 6; wherein,
the feeding hoister is in butt joint with a feeding hole of the powder concentrator, a coarse powder outlet of the powder concentrator is connected with an inlet of the weighing bin, an outlet of the weighing bin is in butt joint with an inlet of the roller press, and an outlet of the roller press is in butt joint with an inlet of the hoister; the semi-coarse powder outlet of the powder concentrator is butted with the inlet of the ball mill through a chute; the fine powder outlet of the powder concentrator is butted with a finished product conveyor; the main air outlet of the air collecting sleeve is in butt joint with the air inlet of the cyclone cylinder, the circulating fan and the air inlet of the powder concentrator are in butt joint sequentially through air pipes, and the discharge port of the cyclone cylinder is in butt joint with the finished product conveyor through the chute.
8. An external circulation semi-final pre-grinding system of a cement vertical mill, which comprises a feeding hoister, a vertical mill, a belt conveyor, a cyclone, a circulating fan and a finished product conveyor, and is characterized by further comprising the powder concentrator of any one of claims 1 to 6; wherein,
the feeding elevator is butted with a feeding hole of the powder concentrator, a coarse powder outlet of the powder concentrator is butted with an inlet of the vertical mill, and a material outlet of the vertical mill is butted with a material inlet of the feeding elevator through a rubber belt conveyor; the semi-coarse powder outlet of the powder concentrator is butted with the inlet of the ball mill through a chute; a fine powder outlet of the powder concentrator is butted with a finished product conveyor; the main air outlet of the air collecting sleeve is in butt joint with the air inlet of the cyclone cylinder, the circulating fan and the air inlet of the powder concentrator are in butt joint sequentially through air pipes, and the discharge port of the cyclone cylinder is in butt joint with the finished product conveyor through the chute.
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| CN202010492320.9A CN111495560A (en) | 2020-06-03 | 2020-06-03 | Static double-grading powder concentrator and semi-final pre-grinding system |
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