WO2020048279A1 - 一种多转子动态选粉机、选粉方法及辊压机终粉磨*** - Google Patents

一种多转子动态选粉机、选粉方法及辊压机终粉磨*** Download PDF

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WO2020048279A1
WO2020048279A1 PCT/CN2019/099331 CN2019099331W WO2020048279A1 WO 2020048279 A1 WO2020048279 A1 WO 2020048279A1 CN 2019099331 W CN2019099331 W CN 2019099331W WO 2020048279 A1 WO2020048279 A1 WO 2020048279A1
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Prior art keywords
powder
rotor
air inlet
selection
gap
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PCT/CN2019/099331
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English (en)
French (fr)
Inventor
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
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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
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Publication of WO2020048279A1 publication Critical patent/WO2020048279A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B5/00—Other centrifuges
    • B04B5/12—Centrifuges in which rotors other than bowls generate centrifugal effects in stationary containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/02—Continuous feeding or discharging; Control arrangements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges

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  • 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.
  • 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.
  • 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.
  • the existing single-rotor or dual-rotor powder separator fines are output by one rotor on the top, and the separation efficiency is limited.
  • 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.
  • 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.
  • 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.
  • 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
  • the shape of the rotor is conical, and the taper interval of the rotor is 0-20 °.
  • the rotation speed range of the rotor is 15m / s to 45m / s.
  • 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 °.
  • a heavy hammer air lock valve is provided at the medium coarse powder outlet.
  • 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.
  • 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:
  • 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;
  • 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.
  • 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.
  • 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.
  • 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.
  • FIG. 1 is a structural diagram of a multi-rotor powder separator according to an embodiment of the present invention
  • FIG. 2 is a front view of a multi-rotor powder separator according to an embodiment of the present invention
  • FIG 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;
  • FIG. 5 is a partial structural diagram of a multi-rotor powder separator provided in an embodiment of the present invention.
  • FIG. 6 is a perspective view of a conical rotor according to an embodiment of the present invention.
  • FIG. 7 is a perspective view of a cylindrical rotor according to an embodiment of the present invention.
  • 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.
  • 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.
  • 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 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 °.
  • 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.
  • 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 °.
  • 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.
  • the rotation speed is 15 to 45 m / s.
  • the particle size distribution of the materials can be widened, and the requirements for sorting different types of materials can be met.
  • N 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 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;
  • 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.
  • 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.
  • 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 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.

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Abstract

一种多转子动态选粉机、选粉方法及辊压机终粉磨***，多转子动态选粉机包括选粉筒体（1）；选粉筒体（1）顶部周向均布有两个以上驱动装置（2）；每个驱动装置（2）的下方设有一个转子（4）；驱动装置（2）与转子（4）通过回转装置（3）连接；所有转子（4）分布在同一水平面；在每个转子（4）的下方设有选粉漏斗（5）；在选粉漏斗（5）下方设有反击锥（7）；在反击锥（7）的下方设有进风管道（9），进风管道（9）与选粉筒体（1）之间设有间隙，进风管道（9）的下端为进风口（10）；在选粉筒体（1）的下端接近进风口（10）处设有中粗粉出口（11）；选粉筒体（1）上端开有出风口（14）。

Description

一种多转子动态选粉机、选粉方法及辊压机终粉磨***
本申请要求于2018年09月07日在中国专利局提交的、申请号为“201811045462.X”、发明名称为“多转子动态选粉机、选粉方法及应用”的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明属于无机非金属材料粉磨技术领域，尤其涉及一种多转子动态选粉机、选粉方法及辊压机终粉磨***。
背景技术
在电力、钢铁、水泥及能源等行业，选粉机是常用的粉料分级设备，通过它可以将粉料分选成合格的粉料和不合格的粉料。目前常用的选粉机为单转子或双转子选粉机。以双转子选粉机为例，它一般在选粉分级过程中是采用动力旋转分级，其原理是，设置在选粉机顶部的电机带动含有上、下转子和撒料盘的立轴转动，粉体由进料管落入撤料盘上，落下的粉体一方面受到惯性离心力作用向四周散出，同时受到外接风机由进风口进入的循环风作用向上扬起，气粉混合物由双转子进行分选，细粉通过转子进入细粉收集装置，粗粉沿选粉室内壁落下，进入粗粉收集装置。
但是现有的单转子或双转子选粉机，最终是由顶部的一台转子进行细料输出，分选效率有限；另外现有双转子选粉机是利用设备顶部的一台电机带动撒料盘、上、下转子旋转进行选粉，不仅消耗电能、而且振动大；此外转子的形状为圆柱形，分选叶片的间距一致，导致分选物料的粒度分布窄，最终影响物料的工作性能；同时受转子数量和分布形式的限制，转子的转速、形状不能进行差异性设置。
再者，对于水泥辊压机终粉磨***的选粉机，生产的水泥成品颗粒级配不合理，颗粒形貌圆形度差，导致其需水量大、凝结时间短，既影响水泥的耐久性，又影响水泥的使用。因此，水泥辊压机终粉磨***提出至今，仍没有得到普遍推广和广泛应用。
因此目前亟需一种可以适应不同物料分选的、分选效率高、且能提高成品性能的选粉机。
发明内容
针对现有技术存在的问题，本发明提供了一种选粉精度高、且能提高成品性能的多 转子动态选粉机。
本发明是这样实现的一种多转子动态选粉机，包括选粉筒体；在选粉筒体顶部周向均布有两个以上驱动装置；每个所述驱动装置的下方设有一个转子；所述驱动装置与所述转子通过回转装置连接；所有转子分布在同一水平面，转子设于选粉筒体内；在每个所述转子的下方设有选粉漏斗；在所述选粉漏斗下方设有反击锥；所述反击锥的下方设有进风管道，所述进风管道的下端为进风口，所述选粉筒体的上端开设出风口，下端接近进风口处设有中粗粉出口；所述进风管道与选粉筒体之间设有间隙，所述间隙的上端与所述选粉漏斗的底端连通，底端与所述中粗粉出口连通。
进一步的，所述转子的形状为圆锥形，所述转子的锥度区间为0～20°。
进一步的，所述转子的转速区间为15m/s～45m/s。
进一步的，在每个所述转子的周围设有均匀分布的导向叶片；所述导向叶片的间距为10mm～100mm和/或导向叶片的角度为40～80°。
进一步的，所述中粗粉出口处设有重锤锁风阀。
进一步的，所述选粉漏斗由圆锥壳体和送料管组成，所述圆锥壳体上端大下端小，圆锥壳体的上端设于转子的下方，所述送料管设于圆锥壳体下端，，送料管的末端与所述间隙的上端连通。
进一步的，还包括储粉壳体，所述储粉壳体的内腔正对所述送料管的末端，底端与所述间隙的上端连通。
所述的多转子动态选粉机的选粉方法，包括如下步骤：
S1、经过打散和初步分选的物料从进风口被风带入所述多转子动态选粉机，物料沿进风口进入进风管道；
S2、物料中的部分大颗粒由于重力作用掉落，另一部分较大颗粒在上升过程中被反击锥撞击掉落，掉落的这些物料从进风口落入到选粉机下方被排出，或者落入到间隙从中粗粉出口排出；
S3、剩余的较小颗粒的物料跟随气流同时通过送料管进入所有选粉漏斗；然后通过选粉漏斗被集中送至转子的选粉区；小于分级粒度的物料在旋转中不断上升到转子顶部，并随气流通过出风口进入收尘装置，最终被收集为成品；而大于分级粒度的物料从导向叶片被甩出转子并落入选料漏斗内，然后在重力作用下掉落到进风管道与选粉筒体之间的间隙，最终从中粗粉出口返回到粉磨设备中继续粉磨；
上述S3或者替换为，剩余的较小颗粒的物料跟随气流,通过导向叶片进入选粉区域； 小于分级粒度的物料在旋转中通过转子叶片，不断上升到转子顶部，并随气流通过出风口进入收尘装置，最终被收集为成品；而未能通过转子叶片进入转子内的大于分级粒度的物料落入选料漏斗内，然后在重力作用下掉落到进风管道与选粉筒体之间的间隙，最终从中粗粉出口返回到粉磨设备中继续粉磨。
进一步的，所述S3中，在物料掉落到进风管道与选粉筒体之间的间隙之前，经由送料管滑落到储料壳体进行累计，当物料累积到一定程度，掉落到进风管道与选粉筒体之间的间隙。
一种辊压机终粉磨***，包括上述的多转子动态选粉机，所述多转子动态选粉机能够对水泥，生料，钢渣或矿渣进行选粉。
综上所述，该发明可通过优化和选择选粉机转子的个数、各转子的结构形式、旋转方向和转速，使流场间的相互影响减到最小，能够使多个转子同时输出细粉，在提高工作效率的同时兼顾调整成品级配和产能的优点，是适合辊压机终粉磨***的新型高效选粉机。
附图说明
图1是本发明实施例提供的多转子选粉机的结构图；
图2是本发明实施例提供的多转子选粉机的主视图；
图3是本发明实施例提供的多转子选粉机的俯视图(去掉驱动装置、回转装置和部分选粉筒体)；
图4是图2的左视图；
图5是本发明实施例提供的多转子选粉机内部的部分结构图；
图6是本发明实施例提供的圆锥形转子的立体图；
图7是本发明实施例提供的圆柱形转子的立体图；
图8是分别采用本发明的水泥辊压机终粉磨***以及现有联合粉磨***生产的水泥粒度分布对比图；
图中、1、选粉筒体；2、驱动装置；3、回转装置；4、转子；4-1、旋转体；4-2、加强筋；4-3、转子叶片；5、选粉漏斗；5-1、圆锥壳体；5-2、送料管；6、储粉壳体；7、反击锥；8、支撑结构；9、进风管道；10、进风口；11、中粗粉出口；12、重锤锁风阀；13、百叶阀；14、出风口；15、润滑***、16、导向叶片。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合实施例，对本发明 进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
针对目前的单转子或双转子选粉机选粉效率不高、产品分选粒度分布窄等问题，如图1至图5所示，本发明提供了一种多转子动态选粉机，包括选粉筒体1；在选粉筒体1顶部周向均布有N个驱动选粉机工作的驱动装置2，驱动装置的数量N≥2；每个所述驱动装置2的下方设有一个立式的转子4；N个所述转子4分布在同一水平面，并设于选粉筒体1内；所述驱动装置2与所述转子4通过回转装置3连接；所述回转装置3与驱动装置2连接的一端设在选粉筒体1外，回转装置3与转子4连接的一端设在选粉筒体1内；
在每个所述转子4的下方设有落料用的选粉漏斗5；所述选粉漏斗5由圆锥壳体5-1和送料管5-2组成，圆锥壳体5-1上端大，下端小，圆锥壳体5-1的上端设于转子下方，所述送料管5-2设于圆锥壳体5-1的下端；选粉漏斗5的上端直径稍大于转子4下端的直径，以便于被转子4分选出的物料能够落入选粉漏斗5内；
在所述选粉漏斗5下方设有反击锥7；所述反击锥7为上端大下端小的锥形体；送料管5-2的底部位于反击锥7的***；反击锥7与选粉筒体1之间通过若干支撑结构8进行连接；
在反击锥7的下方设有进风管道9，进风管道9的下端为进风口10，在选粉筒体1的下端接近进风口10处设有中粗粉出口11，所述进风管道9与选粉筒体1之间设有间隙，间隙的上端与所述送料管5-2的末端连通，间隙的底端与所述中粗粉出口11连通。
优选的，所述中粗粉出口11处设有重锤锁风阀12；所述重锤锁风阀12具有出料和锁风功能；在选粉筒体1的下端接近进风口10处还安装有为设备补风的百叶阀13。
优选的，在选粉筒体1上对应送料管5-2的位置设有储粉壳体6，所述储粉壳体6的内腔正对送料管5-2的末端，底端与上述间隙的上端连通。
所述转子4包括旋转体4-1和沿旋转体4-1径向设置的加强筋4-2；所述加强筋4-2呈涡轮状与旋转体4-1的内部连接；加强筋4-2的中心与回转装置3连接；在每个所述转子4的周围还设有均匀分布的导向叶片16；当驱动装置2使回转装置3自转时，转子4会产生以回转装置3为中心的旋转，转子4内部，或转子4与导向叶片16之间形成选粉区域。在旋转体4-1的周向沿竖直方向设有多个转子叶片4-3；所述转子叶片4-3与转子4的径向之间的角度固定不可调，所述转子叶片4-3的角度为18°。
转子4外的粉料可以通过导向叶片16之间的间隙进入转子4内，所述的导向叶片 16的间距越小、导向叶片16与转子4径向之间的角度越大，则产品的细度越细、比表越高，但相应的阻力(空气阻力、颗粒与导向叶片的撞击等)也会增高，因此需要根据产品需求对导向叶片16的间距和角度进行调整。优选的，所述导向叶片16的间距为10-100mm，和/或，导向叶片16的角度为40-80°；更优选的，所述导向叶片16的间距为20-80mm，和/或，导向叶片16的角度为50-75°。
优选的，如图6、7所示，所述转子4的形状可以是圆柱状、也可以为圆锥状；转子4的锥度(圆锥母线与轴线的夹角)通过成品粒度分布要求计算得出，理论上，转子4的锥度越大，导向叶片4-3从下至上的的间距差越大，通过转子4被分选的物料粒度分布越宽，也就是说圆柱形转子4分选的颗粒粒度分布最窄。本发明中N个所述转子4可以分别设定不同的锥度；优选的，所述锥度为0～20°；更优选的，所述锥度为15°。
此外，理论上，对于单个转子4来说，转速越高选出的颗粒越细，当多个转子4存在时，旋转体4-1的转速越高空气阻力越大，转速越低空气阻力越小，这样配合不同的转子4结构形式和转速，就可实现对被分选物料的颗粒级配、细度、比表等方面性能的调整。转子4的转速是根据成品颗粒级配、细度和比表的要求来选择的；每个转子4由驱动装置2通过回转装置3来驱动，驱动装置2包括电机，转速是通过电机的变频调速来实现的，N个所述转子4可以根据成品要求分别设定不同的转速并可以随时调整。优选的，所述转速为15～45m/s。
通过对不同转子4进行锥度、旋转方向、转速的差异性设置以及导向叶片16间距的调整，可以使物料粒度分布变宽，且满足不通种类物料的分选要求。
优选的，转子4的数量N≥2，更优选的，N＝3；这样多个转子4同时输出细粉，不仅提高了工作效率，而且转子4在水平方向的均匀分布保证了选粉机的稳固，有利于减少振动。
所述选粉筒体1的上部设有一个出风口14；所述出风口14设在各个转子4的上侧；选粉筒体1的顶部设有为选粉机轴承给油的润滑***15。
上述选粉机的选粉方法和原理如下：
S1、经过打散和初步分选、符合动选分选的物料从进风口10被气流带入多转子动态选粉机，物料沿进风口10的进入进风管道9；
S2、物料中的部分大颗粒由于重力作用掉落，另一部分较大颗粒在上升过程中被反击锥7撞击掉落，掉落的这些物料无法被气流带走，最后从进风口10落入到选粉机下方被排出，或者落入到间隙从中粗粉出口排出；
S3、剩余的较小颗粒的物料跟随气流进入转子4的选粉区；转子4在高速旋转时选粉区形成自上而下的多层水平旋流，该旋流速度均衡稳定，在旋流中物料受到的离心力与气流向心力平衡，为精确分选创造了条件；一层层平面旋流不断将细颗粒和粗颗粒分割开来，其中小于分级粒度的物料在旋转中不断上升到转子4顶部，并随气流通过出风口14进入选粉机后续的收尘装置，最终被收集为成品；而大于分级粒度的物料通过导向叶片16被甩出转子4并落入选料漏斗5内，然后在重力作用下经由送料管5-2滑落至储料壳体6，当储料壳体6的物料积累到一定程度，物料掉落到进风管道9与选粉筒体1之间的间隙，最终进入中粗粉出口11，并从重锤锁风阀12处返回到粉磨设备中继续粉磨。
上述S3或者替换为，剩余的较小颗粒的物料跟随气流,通过导向叶片16进入选粉区域；小于分级粒度的物料在旋转中通过转子叶片4-3，不断上升到转子4顶部，并随气流通过出风口14进入收尘装置，最终被收集为成品；而未能通过转子叶片4-3进入转子4内的大于分级粒度的物料落入选料漏斗5内，然后在重力作用下经由送料管5-2滑落至储料壳体6，当储料壳体6的物料积累到一定程度，物料掉落到进风管道9与选粉筒体1之间的间隙，最终进入中粗粉出口11，并从重锤锁风阀12处返回到粉磨设备中继续粉磨。
上述S3中，需要说明的是，较小颗粒的粒径小于S2中较大颗粒粒径。
该发明可通过优化和选择选粉机转子的个数、各转子的结构形式、旋转方向和转速，使流场间的相互影响减到最小，使其兼顾调整成品级配和产能的优点，是适合辊压机终粉磨***的新型高效选粉机。
本发明还提供辊压机终粉磨***，包括本发明的多转子选粉机，多转子动态选粉机能够对水泥，生料，钢渣或矿渣进行选粉操作，大大提高选粉效率。
一般的水泥辊压机终粉磨***生产的水泥成品颗粒级配不合理，颗粒形貌圆形度差，导致其需水量大、凝结时间短，既影响水泥的耐久性，又影响水泥的使用。因此，水泥辊压机终粉磨***提出至今，仍没有得到普遍推广和广泛应用。
采用了本发明多转子动态选粉机的水泥辊压机终粉磨***测得的水泥样品和现有辊压机联合粉磨***测得的水泥样品性能对比数据如表1，粒径分布对比如图8所示：
表1
Figure PCTCN2019099331-appb-000001
Figure PCTCN2019099331-appb-000002
从表1可以看出，在比表面积相当的情况下，辊压机联合粉磨***和辊压机终粉磨***所生产的水泥其物化性能(如需水量、流动度、抗压强度等)相当；
从图8明显可以看出，使用了本发明多转子动态选粉机的辊压机终粉磨***的粒度分布宽于现有联合粉磨***所生产的水泥，即可以得到粒度分布更加合理的水泥成品，保证水泥成品的粒度及工作性能，有利于辊压机终粉磨***在水泥生产行业中广泛推广。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (11)

  1. 一种多转子动态选粉机，包括选粉筒体；其特征在于：在选粉筒体顶部周向均布有两个以上驱动装置；每个所述驱动装置的下方设有一个转子；所述驱动装置与所述转子通过回转装置连接；所有转子分布在同一水平面，转子设于选粉筒体内；在每个所述转子的下方设有选粉漏斗；所述选粉漏斗下方设有反击锥；所述反击锥的下方设有进风管道，所述进风管道的下端为进风口，所述选粉筒体的上端开设出风口，下端接近进风口处设有中粗粉出口；所述进风管道与选粉筒体之间设有间隙，所述间隙的上端与所述选粉漏斗的底端连通，底端与所述中粗粉出口连通。
  2. 如权利要求1所述的多转子动态选粉机，其特征在于：所述转子的形状为圆锥形，所述转子的锥度区间为0～20°。
  3. 如权利要求1所述的多转子动态选粉机，其特征在于：所述转子的转速区间为15m/s～45m/s。
  4. 如权利要求1所述的多转子动态选粉机，其特征在于：在每个所述转子的周围设有均匀分布的导向叶片；所述导向叶片的间距为10mm～100mm和/或导向叶片的角度为40～80°。
  5. 如权利要求1所述的多转子动态选粉机，其特征在于：所述中粗粉出口处设有重锤锁风阀。
  6. 如权利要求1所述的多转子动态选粉机，其特征在于：所述选粉漏斗由圆锥壳体和送料管组成，所述圆锥壳体上端大下端小，圆锥壳体的上端设于转子的下方，所述送料管设于圆锥壳体下端，送料管的末端与所述间隙的上端连通。
  7. 如权利要求6所述的多转子动态选粉机，其特征在于：还包括储粉壳体，所述储粉壳体的内腔正对所述送料管的末端，底端与所述间隙的上端连通。
  8. 一种利用如权利要求1-6任一项所述的多转子动态选粉机的选粉方法，其特征在于：包括如下步骤：
    S1、经过打散和初步分选的物料从进风口被风带入所述多转子动态选粉机，物料沿进风口进入进风管道；
    S2、物料中的部分大颗粒由于重力作用掉落，另一部分较大颗粒在上升过程中被反击锥撞击掉落，掉落的这些物料从进风口落入到选粉机下方被排出，或者落入到间隙从中粗粉出口排出；
    S3、剩余的较小颗粒的物料跟随气流同时通过送料管进入所有选粉漏斗；然后通过选粉漏斗被集中送至转子的选粉区；小于分级粒度的物料在旋转中不断上升到转子顶 部，并随气流通过出风口进入收尘装置，最终被收集为成品；而大于分级粒度的物料从导向叶片被甩出转子并落入选料漏斗内，然后在重力作用下掉落到进风管道与选粉筒体之间的间隙，最终从中粗粉出口返回到粉磨设备中继续粉磨。
  9. 如权利要求8所述的多转子动态选粉机的选粉方法，其特征在于：所述S3替换为，剩余的较小颗粒的物料跟随气流,通过导向叶片进入选粉区域；小于分级粒度的物料在旋转中通过转子叶片，不断上升到转子顶部，并随气流通过出风口进入收尘装置，最终被收集为成品；而未能通过转子叶片进入转子内的大于分级粒度的物料落入选料漏斗内，然后在重力作用下掉落到进风管道与选粉筒体之间的间隙，最终从中粗粉出口返回到粉磨设备中继续粉磨。
  10. 如权利要求8或9所述的多转子动态选粉机的选粉方法，其特征在于：所述S3中，在物料掉落到进风管道与选粉筒体之间的间隙之前，经由送料管滑落到储料壳体进行累计，当物料累积到一定程度，掉落到进风管道与选粉筒体之间的间隙。
  11. 一种辊压机终粉磨***，其特征在于：包括如权利要求1至7任一项的多转子动态选粉机，所述多转子动态选粉机能够对水泥、生料、钢渣或矿渣进行选粉。
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CN109332010A (zh) * 2018-09-07 2019-02-15 天津水泥工业设计研究院有限公司 多转子动态选粉机、选粉方法及应用

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