WO2020048279A1

WO2020048279A1 - Multi-rotor dynamic powder sorting machine, powder sorting method and roller press final powder grinding system

Info

Publication number: WO2020048279A1
Application number: PCT/CN2019/099331
Authority: WO
Inventors: 张爽; 许芬; 李洪; 王振生; 马秀宽; 王小峰; 姜志勇; 张黎; 候国锋; 褚旭; 于君
Original assignee: 天津水泥工业设计研究院有限公司; 中材装备集团有限公司
Priority date: 2018-09-07
Filing date: 2019-08-06
Publication date: 2020-03-12
Also published as: CN109332010A

Abstract

A multi-rotor dynamic powder sorting machine, a powder sorting method and a final powder grinding system of a roller press, the multi-rotor dynamic powder sorting machine comprising a powder sorting cylinder (1), wherein two or more driving devices (2) are evenly arranged on the top of the powder sorting cylinder (1) in the circumferential direction; a rotor (4) is arranged below each driving device (2); each driving device (2) is connected to the rotor (4) by means of a rotating device (3); all of the rotors (4) are distributed in the same horizontal plane; a powder sorting hopper (5) is provided below each rotor (4); a counter-attack cone (7) is provided below the powder sorting hoppers (5); an air inlet pipe (9) is provided below the counter-attack cone (7), a gap is formed between each air inlet pipe (9) and the powder sorting cylinder (1), and a lower end of the air inlet pipe (9) is an air inlet (10); medium and coarse powder outlets (11) are formed at positions close to the air inlet (10) of the lower end of the powder sorting cylinder (1); and an air outlet (14) is formed at the upper end of the powder sorting cylinder (1).

Description

Multi-rotor dynamic powder sorting machine, powder sorting method and final grinding system of roller press

This application claims the priority of the application number "201811045462.X" and the invention name "Multi-rotor Dynamic Powder Selector, Method and Application" filed in the Chinese Patent Office on September 7, 2018, and its entire contents Incorporated by reference in this application.

Technical field

The invention belongs to the technical field of inorganic non-metal material grinding, and particularly relates to a multi-rotor dynamic powder sorting machine, a powder sorting method, and a final grinding system of a roller press.

Background technique

In the power, iron and steel, cement, and energy industries, the powder separator is a commonly used powder grading device. It can sort the powder into qualified powder and unqualified powder. The currently used powder separators are single-rotor or double-rotor powder separators. Take the dual-rotor powder separator as an example. Generally, it uses dynamic rotary classification in the powder selection and classification process. The principle is that the motor set on the top of the powder separator drives the vertical shaft containing the upper and lower rotors and the spreading disc to rotate. The body falls from the feeding tube onto the withdrawal tray. The falling powder is scattered around by the inertia centrifugal force on the one hand, and at the same time it is lifted upward by the circulating air from the external fan through the air inlet. Sorting, the fine powder enters the fine powder collection device through the rotor, and the coarse powder falls along the inner wall of the powder selection chamber and enters the coarse powder collection device.

However, in the existing single-rotor or dual-rotor powder separator, fines are output by one rotor on the top, and the separation efficiency is limited. In addition, the existing dual-rotor powder separator is driven by a motor on the top of the equipment. The disc, upper and lower rotors rotate for powder selection, which not only consumes electricity, but also has large vibrations. In addition, the shape of the rotor is cylindrical, and the pitch of the sorting blades is consistent, which results in a narrow particle size distribution of the sorted materials and ultimately affects the performance of the materials; At the same time, due to the limitation of the number and distribution of rotors, the speed and shape of the rotor cannot be set differently.

In addition, for the classifier of the final grinding system of the cement roller press, the gradation of the particles of the finished cement product is unreasonable, and the roundness of the particle morphology is poor, resulting in large water requirements and short setting time, which affects the durability of the cement. Properties, and affect the use of cement. Therefore, the final grinding system of the cement roller press has not been widely popularized and widely used so far.

Therefore, there is an urgent need for a powder sorter that can adapt to the sorting of different materials, has high sorting efficiency, and can improve the performance of the finished product.

Summary of the Invention

In view of the problems existing in the prior art, the present invention provides a multi-rotor dynamic powder sorter with high powder sorting accuracy and improved performance of finished products.

The invention is a multi-rotor dynamic powder sorting machine implemented in this way, which includes a powder sorting barrel body; more than two driving devices are evenly distributed in the circumferential direction of the top of the powder sorting barrel body; a rotor is arranged below each of the driving devices; The driving device and the rotor are connected by a slewing device; all the rotors are distributed on the same horizontal plane, and the rotors are arranged in the powder selecting cylinder; a powder selecting funnel is arranged below each of the rotors; and a powder selecting funnel is arranged below the powder selecting funnel An impact cone; an air intake duct is arranged below the impact cone, the lower end of the air intake duct is an air inlet, an air outlet is set at the upper end of the powder selection cylinder, and a medium coarse powder outlet is arranged near the air inlet at the lower end; A gap is provided between the air inlet duct and the powder selecting cylinder, an upper end of the gap is in communication with a bottom end of the powder selecting funnel, and a bottom end is in communication with the medium coarse powder outlet.

Further, the shape of the rotor is conical, and the taper interval of the rotor is 0-20 °.

Further, the rotation speed range of the rotor is 15m / s to 45m / s.

Further, a uniformly distributed guide blade is provided around each of the rotors; a pitch of the guide blades is 10 mm to 100 mm and / or an angle of the guide blades is 40 to 80 °.

Further, a heavy hammer air lock valve is provided at the medium coarse powder outlet.

Further, the powder selection funnel is composed of a conical casing and a feeding tube, the upper end of the conical casing is large and the lower end is small, the upper end of the conical casing is disposed below the rotor, and the feeding tube is disposed at the lower end of the cone casing, The end of the feeding tube communicates with the upper end of the gap.

Further, it further comprises a powder storage casing, the inner cavity of the powder storage casing is directly opposite to the end of the feeding tube, and the bottom end is in communication with the upper end of the gap.

The powder selection method of the multi-rotor dynamic powder separator includes the following steps:

S1. The material after being dispersed and preliminary sorted is taken into the multi-rotor dynamic powder separator from the air inlet by wind, and the material enters the air inlet pipe along the air inlet;

S2. Some of the large particles in the material fall due to gravity, and another part of the larger particles are dropped by the impact cone during the ascent process. The dropped materials fall from the air inlet into the powder separator and are discharged, or fall. Into the gap and discharged from the coarse powder outlet;

S3. The remaining small particles of material follow the airflow and enter all the powder selection funnels through the feeding tube at the same time; then, they are sent to the powder selection area of the rotor through the powder selection funnel; It enters the dust collection device with the airflow through the air outlet, and is finally collected as a finished product; while the material larger than the classification particle size is thrown out of the rotor from the guide blade and falls into the material selection funnel, and then falls under the action of gravity to the air inlet pipe and Select the gap between the powder barrels, and finally return from the coarse powder outlet to the grinding equipment to continue grinding;

The above S3 may be replaced by the following: the remaining smaller particles follow the airflow and enter the powder selection area through the guide blades; the materials smaller than the classified particle size pass through the rotor blades during the rotation, continuously rise to the top of the rotor, and enter the airflow through the air outlet. The dust device is finally collected as a finished product. However, the material larger than the classified particle size that fails to enter the rotor through the rotor blades falls into the material selection funnel, and then falls between the air inlet pipe and the powder selection cylinder under the action of gravity. The gap is finally returned from the medium coarse powder outlet to the grinding equipment to continue grinding.

Further, in S3, before the material falls to the gap between the air inlet pipe and the powder selection cylinder, it is accumulated by sliding down to the storage shell through the feeding pipe, and when the material accumulates to a certain degree, it falls to the inlet. The gap between the air duct and the powder selection cylinder.

A final grinding system of a roller press includes the above-mentioned multi-rotor dynamic classifier, which is capable of classifying cement, raw meal, steel slag or slag.

In summary, the invention can minimize the interaction between the flow fields by optimizing and selecting the number of rotors of the powder separator, the structure of each rotor, the direction of rotation, and the speed of rotation, and can enable multiple rotors to output simultaneously. Powder, while improving the working efficiency while taking into account the advantages of adjusting the gradation and production capacity of the finished product, is a new efficient powder sorter suitable for the final grinding system of the roller press.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural diagram of a multi-rotor powder separator according to an embodiment of the present invention;

2 is a front view of a multi-rotor powder separator according to an embodiment of the present invention;

3 is a top view of a multi-rotor powder separator provided by an embodiment of the present invention (removing a driving device, a rotating device and a part of a powder selecting cylinder);

Figure 4 is a left side view of Figure 2;

5 is a partial structural diagram of a multi-rotor powder separator provided in an embodiment of the present invention;

6 is a perspective view of a conical rotor according to an embodiment of the present invention;

7 is a perspective view of a cylindrical rotor according to an embodiment of the present invention;

8 is a comparison diagram of the particle size distribution of cement produced by using the final grinding system of the cement roller press of the present invention and the existing combined grinding system;

In the figure, 1, the powder selecting cylinder, 2, the driving device, 3, the slewing device, 4, the rotor, 4-1, the rotating body, 4-2, the ribs, 4-3, the rotor blade, and 5, the powder selecting funnel ; 5-1, conical shell; 5-2, feeding tube; 6, powder storage shell; 7, counter-attack cone; 8, support structure; 9, air inlet pipe; 10, air inlet; 11, medium coarse powder outlet 12, heavy-duty air lock valve; 13, louver valve; 14, air outlet; 15, lubrication system, 16, guide vane.

detailed description

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following describes the present invention in further detail with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

Aiming at the problems of current single-rotor or double-rotor powder separators with low powder selection efficiency and narrow product sorting particle size distribution, as shown in Figures 1 to 5, the present invention provides a multi-rotor dynamic powder separator, including Powder cylinder 1; N driving devices 2 for driving the powder sorter are evenly distributed on the top of the powder selecting cylinder 1, and the number of the driving devices is N≥2; a vertical type is arranged below each of the driving devices 2. Rotor 4; N said rotors 4 are distributed on the same horizontal plane and are arranged in the powder selecting cylinder body 1; said driving device 2 and said rotor 4 are connected by a rotating device 3; said rotating device 3 is connected with the driving device 2 One end is disposed outside the powder selecting cylinder 1, and one end connected to the rotary device 3 and the rotor 4 is provided in the powder selecting cylinder 1;

A powder selection funnel 5 for blanking is provided below each of the rotors 4; the powder selection funnel 5 is composed of a conical casing 5-1 and a feeding tube 5-2, and the upper end of the conical casing 5-1 is large. The lower end is small, the upper end of the conical housing 5-1 is located below the rotor, and the feeding pipe 5-2 is provided at the lower end of the conical housing 5-1; the diameter of the upper end of the powder selection funnel 5 is slightly larger than the diameter of the lower end of the rotor 4 so that The material selected by the rotor 4 can fall into the powder selection funnel 5;

A counter cone 7 is provided below the powder selection funnel 5; the counter cone 7 is a cone with a large upper end and a small lower end; the bottom of the feeding tube 5-2 is located at the periphery of the counter cone 7; the counter cone 7 and the powder selection cylinder 1 is connected by several supporting structures 8;

An air inlet duct 9 is provided below the counter cone 7. The lower end of the air inlet duct 9 is an air inlet 10. A middle coarse powder outlet 11 is provided at the lower end of the powder selection cylinder 1 near the air inlet 10. A gap is provided between 9 and the powder selecting cylinder 1, the upper end of the gap is in communication with the end of the feeding tube 5-2, and the bottom end of the gap is in communication with the medium coarse powder outlet 11.

Preferably, a heavy-duty air lock valve 12 is provided at the medium coarse powder outlet 11; the heavy-duty air lock valve 12 has the functions of discharging and air-locking; the lower end of the powder selecting cylinder 1 is also close to the air inlet 10 A louver valve 13 for supplying air to the equipment is installed.

Preferably, a powder storage housing 6 is provided on the powder selection cylinder 1 at a position corresponding to the feeding tube 5-2, and the inner cavity of the powder storage housing 6 is directly opposite to the end of the feeding tube 5-2, and the bottom end is the same as the above The upper end of the gap communicates.

The rotor 4 includes a rotating body 4-1 and a reinforcing rib 4-2 provided along the radial direction of the rotating body 4-1. The reinforcing rib 4-2 is connected in a turbine shape to the inside of the rotating body 4-1. The reinforcing rib 4 The center of -2 is connected to the slewing device 3; evenly distributed guide vanes 16 are provided around each of the rotors 4; when the driving device 2 rotates the slewing device 3, the rotor 4 will be centered on the slewing device 3. Rotation, the powder selection area is formed inside the rotor 4 or between the rotor 4 and the guide vanes 16. A plurality of rotor blades 4-3 are provided in the vertical direction in the circumferential direction of the rotating body 4-1. The angle between the rotor blades 4-3 and the radial direction of the rotor 4 is fixed and cannot be adjusted. The angle is 18 °.

The powder outside the rotor 4 can enter the rotor 4 through the gap between the guide vanes 16. The smaller the distance between the guide vanes 16, the larger the angle between the guide vanes 16 and the rotor 4, and the finer the product. The finer the degree, the higher the ratio, but the corresponding resistance (air resistance, impact of particles and guide vanes, etc.) will also increase, so the pitch and angle of the guide vanes 16 need to be adjusted according to product requirements. Preferably, the pitch of the guide blades 16 is 10-100 mm, and / or the angle of the guide blades 16 is 40-80 °; more preferably, the pitch of the guide blades 16 is 20-80 mm, and / or, The angle of the guide vanes 16 is 50-75 °.

Preferably, as shown in FIGS. 6 and 7, the shape of the rotor 4 may be cylindrical or conical; the taper of the rotor 4 (the angle between the cone generatrix and the axis) is calculated from the particle size distribution requirements of the finished product, Theoretically, the larger the taper of the rotor 4, the larger the difference in the distance between the guide blades 4-3 from the bottom to the top, and the wider the particle size distribution of the materials sorted by the rotor 4, that is, the particle size of the cylindrical rotor 4 The distribution is the narrowest. In the present invention, N taps of the rotors 4 can be set with different tapers; preferably, the taper is 0 to 20 °; more preferably, the taper is 15 °.

In addition, in theory, for a single rotor 4, the higher the rotation speed, the finer the particles are selected. When multiple rotors 4 are present, the higher the rotation speed of the rotating body 4-1, the greater the air resistance, and the lower the rotation speed, the more air resistance. It is small, so that with different structural forms and rotation speeds of the rotor 4, the performance of the particle gradation, fineness, and ratio of the sorted materials can be adjusted. The rotation speed of the rotor 4 is selected according to the requirements of the finished particle gradation, fineness and ratio table; each rotor 4 is driven by the driving device 2 through the rotary device 3, the driving device 2 includes a motor, and the speed is adjusted by the frequency conversion of the motor According to the requirements of the speed, different speeds of the N rotors 4 can be set according to the requirements of the finished product and can be adjusted at any time. Preferably, the rotation speed is 15 to 45 m / s.

By setting different tapers, rotation directions, and rotational speeds of different rotors 4 and adjusting the pitch of the guide vanes 16, the particle size distribution of the materials can be widened, and the requirements for sorting different types of materials can be met.

Preferably, the number N of the rotors 4 is greater than or equal to 2, more preferably, N = 3. In this way, multiple rotors 4 output fine powder at the same time, which not only improves the working efficiency, but also the uniform distribution of the rotors 4 in the horizontal direction guarantees Stable, which helps reduce vibration.

An air outlet 14 is provided on the upper part of the powder selecting cylinder 1; the air outlet 14 is provided on the upper side of each rotor 4; and a lubrication system 15 is provided on the top of the powder selecting cylinder 1 to feed oil to the bearing of the powder selecting machine. .

The powder selection method and principle of the above powder separator are as follows:

S1. After being separated and preliminary sorted, the materials meeting the dynamic sorting are taken from the air inlet 10 into the multi-rotor dynamic powder separator, and the materials enter the air inlet pipe 9 along the air inlet 10;

S2. Some of the large particles in the material fall due to gravity, and another part of the larger particles are dropped by the impact cone 7 during the ascent process. These falling materials cannot be carried away by the airflow, and finally fall from the air inlet 10 to The powder separator is discharged below, or falls into the gap and is discharged from the coarse powder outlet;

S3. The remaining smaller particles enter the powder selecting area of the rotor 4 following the airflow; the powder selecting area of the rotor 4 forms a multi-level horizontal swirl from top to bottom when the rotor 4 rotates at a high speed. The swirl speed is balanced and stable. The centrifugal force and the centripetal force of the material in the medium are balanced, creating conditions for accurate sorting; layer-by-layer swirling surface continuously separates fine particles and coarse particles, and the materials smaller than the graded particle size continue to rise to the top of the rotor 4 during rotation. And enters the dust collector of the powder separator with the airflow through the air outlet 14 and is finally collected as a finished product; and the material larger than the classification particle size is thrown out of the rotor 4 through the guide blade 16 and falls into the material selection funnel 5, and then Under the action of gravity, it slides down to the storage case 6 through the feeding pipe 5-2. When the material of the storage case 6 accumulates to a certain degree, the material falls into the gap between the air inlet pipe 9 and the powder selection cylinder 1, and finally Enter the medium coarse powder outlet 11 and return from the hammer lock air valve 12 to the grinding equipment to continue grinding.

The above S3 or replaced by, the remaining smaller particles follow the airflow and enter the powder selection area through the guide vanes 16; the materials smaller than the classified particle size pass through the rotor blades 4-3 during the rotation, continuously rise to the top of the rotor 4, and follow the airflow It enters the dust collection device through the air outlet 14 and is finally collected as a finished product. However, the material larger than the classified particle size that fails to enter the rotor 4 through the rotor blades 4-3 falls into the selection funnel 5, and then passes through the feeding pipe under the action of gravity. 5-2 Slid down to the storage case 6, when the material of the storage case 6 accumulates to a certain degree, the material falls into the gap between the air inlet pipe 9 and the powder selection cylinder 1, and finally enters the medium coarse powder outlet 11 , And return to the grinding equipment from the hammer lock air valve 12 to continue grinding.

In the above S3, it should be noted that the particle diameter of the smaller particles is smaller than that of the larger particles in S2.

The invention can minimize and optimize the interaction between the flow fields by optimizing and selecting the number of rotors of the powder separator, the structural form of each rotor, the direction of rotation, and the speed of rotation, so that it can take into account the advantages of adjusting the gradation and capacity of the finished product. A new high-efficiency classifier suitable for the final grinding system of a roller press.

The present invention also provides a final grinding system of a roller press, which includes the multi-rotor powder separator of the present invention. The multi-rotor dynamic powder separator can perform a powder selection operation on cement, raw meal, steel slag or slag, and greatly improves the powder selection efficiency.

The granularity of the finished cement particles produced by the general grinding system of the general cement roller press is unreasonable, the circularity of the particle morphology is poor, resulting in large water requirements and short setting time, which affects both the durability of the cement and the use of the cement. . Therefore, the final grinding system of the cement roller press has not been widely popularized and widely used so far.

The performance comparison data of the cement samples measured by the final grinding system of the cement roller press using the multi-rotor dynamic classifier of the present invention and the cement samples measured by the existing roller press combined grinding system are shown in Table 1. For example, as shown in Figure 8:

Table 1

As can be seen from Table 1, the physical and chemical properties (such as water demand, fluidity, compressive strength, etc.) of the cement produced by the roller mill combined with the grinding system and the final grinding system of the roller under the condition of equivalent specific surface area quite;

It is obvious from FIG. 8 that the particle size distribution of the final grinding system of the roller press using the multi-rotor dynamic classifier of the present invention is wider than the cement produced by the existing combined grinding system, that is, a more reasonable particle size distribution can be obtained. The finished cement product guarantees the granularity and working performance of the finished cement product, which is conducive to the widespread promotion of the final grinding system of the roller press in the cement production industry.

The above description is only the preferred embodiments of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be included in the protection of the present invention. Within range.

Claims

A multi-rotor dynamic powder sorting machine includes a powder sorting cylinder; it is characterized in that: more than two driving devices are evenly distributed on the top of the powder sorting cylinder in the circumferential direction; a rotor is arranged below each of the driving devices; The device and the rotor are connected by a slewing device; all the rotors are distributed on the same horizontal plane, and the rotors are arranged in the powder selecting cylinder; a powder selecting funnel is arranged below each of the rotors; a counter cone is arranged below the powder selecting funnel; An air inlet duct is provided below the counter cone, the lower end of the air inlet duct is an air inlet, the upper end of the powder selection cylinder is provided with an air outlet, and the lower end is provided with a medium coarse powder outlet near the air inlet; A gap is provided between the air duct and the powder selection cylinder. The upper end of the gap is in communication with the bottom end of the powder selection funnel, and the bottom end is in communication with the medium coarse powder outlet.
The multi-rotor dynamic powder classifier according to claim 1, wherein the shape of the rotor is conical, and the taper interval of the rotor is 0-20 °.
The multi-rotor dynamic classifier according to claim 1, wherein the rotation speed range of the rotor is 15m / s to 45m / s.
The multi-rotor dynamic powder classifier according to claim 1, characterized in that: uniformly distributed guide vanes are provided around each of the rotors; a pitch of the guide vanes is 10 mm to 100 mm and / or The angle is 40 to 80 °.
The multi-rotor dynamic powder classifier according to claim 1, characterized in that: a heavy hammer air lock valve is provided at the medium coarse powder outlet.
The multi-rotor dynamic powder separator according to claim 1, characterized in that the powder selection funnel is composed of a conical shell and a feeding tube, the upper end of the conical shell is large and the lower end is small, and the upper end of the conical shell is provided on the rotor. Below, the feeding tube is disposed at the lower end of the conical shell, and the end of the feeding tube is in communication with the upper end of the gap.
The multi-rotor dynamic powder sorter according to claim 6, further comprising a powder storage casing, wherein an inner cavity of the powder storage casing is directly opposite to an end of the feeding tube, and a bottom end and the gap are The upper end is connected.
A powder selection method using a multi-rotor dynamic powder separator according to any one of claims 1-6, comprising the following steps:

S1. The material after being dispersed and preliminary sorted is taken into the multi-rotor dynamic powder separator from the air inlet by wind, and the material enters the air inlet pipe along the air inlet;

S2. Some of the large particles in the material fall due to gravity, and another part of the larger particles are dropped by the impact cone during the ascent process. The dropped materials fall from the air inlet into the powder separator and are discharged, or fall. Into the gap and discharged from the coarse powder outlet;

S3. The remaining small particles of material follow the airflow and enter all the powder selection funnels through the feeding tube at the same time; then, they are sent to the powder selection area of the rotor through the powder selection funnel; It enters the dust collection device with the airflow through the air outlet, and is finally collected as a finished product; while the material larger than the classification particle size is thrown out of the rotor from the guide blade and falls into the material selection funnel, and then falls under the action of gravity to the air inlet pipe and The gap between the powder selection cylinders is finally returned from the coarse powder outlet to the grinding equipment to continue grinding.
The powder selection method of a multi-rotor dynamic powder separator according to claim 8, characterized in that: said S3 is replaced by the remaining smaller particles of material following the airflow and entering the powder selection area through the guide vanes; During the rotation, the material passes through the rotor blades, continuously rises to the top of the rotor, and enters the dust collection device with the airflow through the air outlet, and is finally collected as a finished product. However, the material that fails to enter the rotor through the rotor blades and falls into the selection Inside the funnel, it then drops into the gap between the air inlet pipe and the powder selection cylinder under the action of gravity, and finally returns from the coarse powder outlet to the grinding equipment to continue grinding.
The powder selection method for a multi-rotor dynamic powder separator according to claim 8 or 9, characterized in that in the step S3, before the material falls to the gap between the air inlet duct and the powder selection cylinder, the material is fed through The tube slides down to the storage shell for accumulation. When the material accumulates to a certain extent, it falls to the gap between the air intake duct and the powder selection cylinder.
A final grinding system for a roller press, comprising: a multi-rotor dynamic classifier according to any one of claims 1 to 7, wherein the multi-rotor dynamic classifier is capable of treating cement, raw materials, steel slag or slag. Carry out powder selection.