CN100408190C - Bowl-type medium speed coal mill - Google Patents
Bowl-type medium speed coal mill Download PDFInfo
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- CN100408190C CN100408190C CNB2005101118374A CN200510111837A CN100408190C CN 100408190 C CN100408190 C CN 100408190C CN B2005101118374 A CNB2005101118374 A CN B2005101118374A CN 200510111837 A CN200510111837 A CN 200510111837A CN 100408190 C CN100408190 C CN 100408190C
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Abstract
The bowl-type medium speed coal mill includes a coal shoot, a separator cap, an inner cone, a separator, a vane wheel unit, a speed reducer, an exhaust valve unit, a door regulator, a Venturi, a side machine body, a milling roll unit, a milling bowl unit, a sealed air manifold and a coal gangue exhaust port. The variable loading spring unit for controlling the loading force is fixed on the separator and connected via pull rod screw to the milling roll unit. The bowl-type medium speed coal mill has high reliability.
Description
Technical field
The present invention relates to a kind of bowl pulverizer that is used for coal-fired station's boiler milling system.
Background technology
Existing bowl pulverizer structure as shown in Figure 1.Mainly by coal spout, separator top cover, inner cone, separation body, impeller unit, planetary reducer, discharging valve device, be folded to parts such as an adjusting device, venturi tube, side body set, mill cup apparatus, sealing air collector, stone coal outlet and form.
The grinding roller of this coal pulverizer adopts hydraulic pressure load-variable device 17.Though the loading force of grinding roller is changed automatically with the coal supply rate; Simultaneously, because the size of loading force is linear change with coal-supplying amount, so can also reduce power consumption; But in actual motion, because the coal pulverizer operating condition is more abominable, Hydraulic Elements such as the oil cylinder in the hydraulic pressure load-variable device, magnetic valve are along with increasing service time, and fault rate is on the increase.According to Shanghai Heavy Machines Plant Co., Ltd and American AB B-CE company to the data analysis of existing this coal pulverizer fault statistics, its fault rate 60% because grinding roller adopts hydraulic pressure to become and loads causes.
In addition, in dump valve valve 18 structures of this coal pulverizer, the cylinder that by-pass valve control opens and closes is vertically arranged, and a crank is housed on the cylinder piston rod head, and the other end of crank connects with valve.Rotation (the promptly opening and closing) motion that moves up and down and just changed into valve of cylinder has realized the action of opening and closing of valve like this.The shortcoming of this structure is:
A) during valve opening the rod end chamber of cylinder in work.Because the locations of structures restriction, cylinder dimensions can not select too greatly, and opening force is just little like this.
B) cylinder must remain pressure when valve remains on opening.If air pressure fluctuation takes place or dies, valve can be closed under the gravity effect automatically, thereby causes whole coal pulverizer to hinder shutdown for some reason.
C) complex structure, maintenance is inconvenient, and the appearance and size height, has influenced the coal pulverizer complete machine and has arranged.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of bowl pulverizer, and it can improve the coal pulverizer reliability of operation, reduces fault rate.
For solving the problems of the technologies described above, bowl pulverizer of the present invention, comprise the side body set, be arranged on the mill cup apparatus in the side body set, the reduction box that is connected with the mill cup apparatus, be installed in the impeller unit on the mill cup apparatus periphery, be supported on the separation body on the side body set, three independent Burnisher apparatus are suspended on to separate in the body and be positioned at and grind the cup apparatus top, be arranged on the sealing air collector and the stone coal outlet of side body set one side-lower, be arranged on the separator top cover that separates on the body, inner cone is positioned at the separator top cover and separates body, be provided with venturi tube and coal spout in the inner cone, the separator top cover is provided with and is folded to an adjusting device, and the sidewall that separates body is provided with the load-variable device of control grinding roller loading force, in the side body set liner plate is housed, and around the mill cup apparatus, forming air inlet, discharging valve device is installed in the top of the multiple exit device that is positioned on the separator top cover; Wherein, described load-variable device adopts the spring load-variable device, is connected with Burnisher apparatus by stay-bolt.
Because bowl pulverizer of the present invention adopts the spring load-variable device, its loading force also is to change automatically with the coal supply rate, and promptly coal-supplying amount increases, loading force is big, and coal-supplying amount is few, loading force is little.And spring become to load be to go up coal seam thickness (being coal supply rate size) by the mill bowl to react on spring, the decrement of spring is changed, thereby spring force is increased or reduces.Owing to become loading without hydraulic pressure, so there is not the pressure regulation reaction speed hysteresis that causes because of pressure oil viscosity.Particularly the use of spring change loading significantly reduces the fault rate of grinding roller charger, and the reliability of coal pulverizer improves, and maintenance, maintenance workload reduce.Performance parameters such as fineness of pulverized coal, coal-grinding power consumption are all constant simultaneously, also corresponding the reducing of coal pulverizer vibration.
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing and the specific embodiment:
Fig. 1 is existing bowl pulverizer structure chart;
Fig. 2 is a bowl pulverizer structure chart of the present invention;
Fig. 3 is the spring load-variable device structure chart that the present invention adopts;
Fig. 4 is the discharging valve device structure chart that the present invention adopts.
The specific embodiment
As shown in Figure 2, bowl pulverizer of the present invention mainly comprises: coal spout 1, separator top cover 3, inner cone 13, separate body 4, impeller unit 5, reduction box 6, discharging valve device 2, be folded to an adjusting device 15, venturi tube 14, spring load-variable device 12, side body set 10, Burnisher apparatus 11, mill cup apparatus 9, sealing air collector 8, stone coal outlet 7, multiple exit device 16 etc.
Side-lower at side body set 10 is provided with sealing air collector 8 and stone coal outlet 7, and stone coal outlet 7 is positioned at the below of sealing air collector 8.
Referring to Fig. 3, described spring load-variable device 12 mainly is made up of main parts size such as stay-bolt 19, adjusting nut 20, double-screw bolt 21, spring cylindrical shell 22, spring flap 23, loading bolt 24, spring 25, spring base 26, support ring combination 27, grinding roller port lids 28.Whole spring load-variable device 12 is fixed by bolts to and separates on the body 4, and is connected with Burnisher apparatus 11 by stay-bolt 19.Stay-bolt 19 is positioned at the upper end of spring cylindrical shell 22, and adjusting nut 20 is screwed on the stay-bolt 19 and is fixed in grinding roller port lid 28.
Loading bolt 24 is located in the spring cylindrical shell 22, and spring 25, spring base 26, spring flap 23, two groups of support ring combinations 27 are installed on the loading bolt 24.Spring 25 withstands between spring base 26 and the spring flap 23, and support ring combination 27 lays respectively at the outside of spring base 26 and spring flap 23.Be provided with seal in the support ring combination 27, prevent that coal dust from entering in the spring cylindrical shell 22.On spring cylindrical shell 22, have two holes, be used for logical sealing wind, protection spring 25.Four double-screw bolts 21 are fixed on spring cylindrical shell 22 on the grinding roller port lid 28.It is to go up coal seam thickness (being coal supply rate size) by the mill bowl to react on spring that spring becomes loading, the decrement of spring is changed, thereby spring force is increased or minimizing.When Coal Seam Thickness Change, the upper-lower position of grinding roller will change, and by the cushion block on the grinding roller, this variation is reflected on the loading bolt 24, and the spring 25 that is contained on the loading bolt 24 also changes thereupon, thus the regulating action of playing.
The discharging valve device that the present invention adopts is made up of four valves as shown in Figure 4, when depositing coal after coal pulverizer is stopped using coal pulverizer and operation boiler is kept apart, and also isolates coal pulverizer with it during maintenance.Discharging valve device adopts the slide valve structure, mainly is made up of slide valve 29, terminal box 30, magnetic valve 31 and some control elements, pipe joint.Discharging valve device 2 is installed in the top of multiple exit device 16, and is fixed on the separator cover device 3 with support.Slide valve is horizontally disposed with for 29 one-tenth, is connected with the outlet(discharge) flange of multiple exit device.The source of the gas mouth is connected by pipeline and four slide valves, and external source of the gas opens or closes by pipeline transmission, magnetic valve 31 control slide valves 29.
Because the present invention adopts the discharging valve device 2 of slide valve structure, slide valve 22 is that level is installed, so no matter air pressure fluctuation or die, valve remains at original state.Simultaneously, owing to be not subjected to spatial constraints, cylinder bore is optional must be bigger, and hoisting capacity is just big like this.In addition, the height of the aspect ratio existing structure of discharging valve device valve of the present invention reduces nearly 1 meter, is convenient to the coal pulverizer entire arrangement.
When bowl pulverizer of the present invention was worked, after raw coal fell on the mill cup apparatus 9, radial outward moved in the action of centrifugal force lower edge, formed one deck coal bed on mill cup apparatus 9, and coal bed passes through for 9 times at the mill cup apparatus that can rotate around the axis.The power of milling of spring load-variable device 12 generations at this moment is applied on the coal by the Burnisher apparatus 11 that rotates.Coal is milled into powder between mill cup apparatus 9 liner plates and Burnisher apparatus 11.Do radially and the coal that circumferentially moves is carrying the coal that is broken and crosses mill cup apparatus 9 edges and enter the pumped (conveying) medium hot-air channel.
In the mill processes of coal, less lighter coal particle is blown afloat from mill cup apparatus 9 continuously by gaseous conveying medium (hot-air).
Hot-air enters from side body set 10, and mill cup apparatus 9 external diameters along rotation rise then.The blade (also claiming impeller) that is contained on the mill cup apparatus 9 makes air-flow be tending towards vertical direction.Less lighter coal grain is thrown away band upwards by air-flow on mill cup apparatus 9 outer rims, and the heavy external foreign material that are difficult for grinding pass air-flow and fall into side body set 10 zones.
Above mill cup apparatus 9, the lighter coal grain that is carried by air has experienced the secondary separation process.
The first order is separated on the horizontal plane that just in time occurs in mill cup apparatus 9.The adjusting device 15 that is folded to that is installed on the separator top cover 3 is swerved the heaviest coal grain.Lose momentum and directly get back to mill and reface on the cup apparatus 9.
Lighter particle is carried into separator top cover 3 by air-flow and carries out second level separation, and Wan Qu adjustable vane makes wind powder mixture generation cyclonic motion cause heavy particle to lose momentum and falls from air-flow herein.
Turn back to the zone of milling of mill cup apparatus 9 along the inwall of inner cone 13 at the blade that is folded to an adjusting device 15 and 14 li heavier coal grains of separating of venturi tube.Inner cone 13 is separated heavy particulate coal from the coal pulverizer regions of turbulent flow.Heavy particulate coal outside regions of turbulent flow is returned mill cup apparatus 9 under the gravity effect.
Pass air-flow and fall into screeding device on the mill bowl hub skirt cover that external foreign material that are difficult for grinding in side body set 10 zone are installed in mill cup apparatus 9 and scrape in the hole on side body set 10 base plates, enter stone coal outlet then and discharge.
The present invention is simple in structure, and is reliable, easy to maintenance, unit power consumption is little, galling is few, long service life, be widely used, fineness of pulverized coal good uniformity and can make linear regulation.
Claims (5)
1. bowl pulverizer, comprise the side body set, be arranged on the mill cup apparatus in the side body set, the reduction box that is connected with the mill cup apparatus, be installed in the impeller unit on the mill cup apparatus periphery, be supported on the separation body on the side body set, three independent Burnisher apparatus are suspended on to separate in the body and be positioned at and grind the cup apparatus top, be arranged on the sealing air collector and the stone coal outlet of side body set one side-lower, be arranged on the separator top cover that separates on the body, inner cone is positioned at the separator top cover and separates body, be provided with venturi tube and coal spout in the inner cone, the separator top cover is provided with and is folded to an adjusting device, the sidewall that separates body is provided with the load-variable device of control grinding roller loading force, in the side body set liner plate is housed, and forms air inlet around the mill cup apparatus, discharging valve device is installed in the top of the multiple exit device that is positioned on the separator top cover; It is characterized in that described load-variable device adopts the spring load-variable device, is connected with Burnisher apparatus by stay-bolt.
2. bowl pulverizer according to claim 1, it is characterized in that, described spring load-variable device comprises a spring cylindrical shell, be located at the loading bolt in the spring cylindrical shell, spring, spring base, spring flap, two groups of support ring combinations (27) are installed on the loading bolt, spring withstands between spring base and the spring flap, and the support ring combination lays respectively at the outside of spring base and spring flap; Stay-bolt is positioned at the upper end of spring cylindrical shell, and adjusting nut is screwed on the stay-bolt and is fixed in and separates on the body.
3. bowl pulverizer according to claim 1 and 2 is characterized in that, described spring load-variable device adopts to be bolted to and separates on the body.
4. bowl pulverizer according to claim 2 is characterized in that, the sidewall of described spring cylindrical shell is provided with the hole of logical sealing wind.
5. bowl pulverizer according to claim 1 is characterized in that, described discharging valve device adopts the slide valve structure, is made up of four slide valves, and is fixed on the separator top cover with support; Slide valve becomes to be horizontally disposed with, and is connected with the outlet(discharge) flange of multiple exit device; The source of the gas mouth is connected by pipeline and four slide valves, and external source of the gas transmits by pipeline, the opening or closing by solenoid control of slide valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101118374A CN100408190C (en) | 2005-12-22 | 2005-12-22 | Bowl-type medium speed coal mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101118374A CN100408190C (en) | 2005-12-22 | 2005-12-22 | Bowl-type medium speed coal mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1986065A CN1986065A (en) | 2007-06-27 |
| CN100408190C true CN100408190C (en) | 2008-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005101118374A Active CN100408190C (en) | 2005-12-22 | 2005-12-22 | Bowl-type medium speed coal mill |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711997A (en) * | 2010-03-26 | 2012-10-03 | 勒舍有限公司 | Roller mill |
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| US7690590B2 (en) * | 2008-06-13 | 2010-04-06 | Alstom Technology Ltd | Electronically controlled journal loading system |
| US8132750B2 (en) * | 2009-06-24 | 2012-03-13 | Alstom Technology Ltd | Force monitor for pulverizer integral spring assembly |
| CN101947484B (en) * | 2010-09-10 | 2011-11-30 | 浙江省电力试验研究院 | Method for reducing discharge capacity of cobble coal of intermediate-speed coal mill |
| KR20140123066A (en) | 2012-01-18 | 2014-10-21 | 히타치 긴조쿠 가부시키가이샤 | Dust core, coil component, and method for producing dust core |
| CN102896023A (en) * | 2012-10-23 | 2013-01-30 | 中国神华能源股份有限公司 | Bowl type coal mill |
| CN103418483A (en) * | 2013-08-29 | 2013-12-04 | 济钢集团有限公司 | Abrasion-resistant impeller device of medium speed coal mill |
| CN104415825B (en) * | 2013-09-02 | 2017-07-25 | 上海意丰机电科技开发有限公司 | A kind of spring charging device |
| CN104549653A (en) * | 2013-10-23 | 2015-04-29 | 上海重型机器厂有限公司 | Coal mill |
| CN104073757B (en) * | 2014-07-16 | 2015-08-05 | 中国石油大学(华东) | Strengthen the method for ocean structure steel resistance to corrosion fatigue performance |
| EP2999542B1 (en) * | 2014-10-31 | 2017-08-09 | Loesche GmbH | Grinding roller |
| CN105642407B (en) * | 2016-03-02 | 2018-07-27 | 河南省少林重型机器有限公司 | Vertical pulverizer |
| CN105833946B (en) * | 2016-04-27 | 2017-12-22 | 江苏方天电力技术有限公司 | A kind of medium-speed pulverizer with new mill bowl structure |
| CN105964387A (en) * | 2016-06-30 | 2016-09-28 | 湖州丰盛新材料有限公司 | Reverse blow sealed hot wind circulating roller grinding device with adjustable pressure of grinding roller |
| CN105964343B (en) * | 2016-06-30 | 2018-11-09 | 湖州丰盛新材料有限公司 | A kind of hot air circulation powder selection device of the adjustable back-blowing sealing of wind speed |
| CN107570273A (en) * | 2017-08-29 | 2018-01-12 | 徐州汉唐瑞清科技有限公司 | A kind of abrasive disk type spring becomes loading middling speed pulverized coal preparation equipment |
| CN109174320B (en) * | 2018-09-10 | 2019-12-31 | 中国矿业大学 | Roller type medium-speed coal mill device |
| CN111437931A (en) * | 2019-01-16 | 2020-07-24 | 上海戎川机电工程设备有限公司 | Medium speed coal mill |
| CN112191331A (en) * | 2020-10-19 | 2021-01-08 | 上海谦淼工业科技有限公司 | Vertical mill with increase-volume and increase-efficiency structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711997A (en) * | 2010-03-26 | 2012-10-03 | 勒舍有限公司 | Roller mill |
| CN102711997B (en) * | 2010-03-26 | 2014-08-13 | 勒舍有限公司 | Roller mill |
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| Publication number | Publication date |
|---|---|
| CN1986065A (en) | 2007-06-27 |
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Owner name: SHANGHAI HEAVY MACHINES PLANT CO., LTD.; SHANGHAI Free format text: FORMER OWNER: SHANGHAI HEAVY MACHINES PLANT CO., LTD. Effective date: 20080919 |
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Effective date of registration: 20080919 Address after: No. 1800, Jiangchuan Road, Shanghai, Minhang District: 200245 Co-patentee after: Shanghai Heavy Machin Forging Factory Patentee after: Shanghai heavy-duty machine factory Co., Ltd. Co-patentee after: Shanghai Heavy-duty Machine Metallurgical Casting Factory Co-patentee after: Shanghai Heavy Machinery Engineering Co., Ltd. Address before: No. 1800, Jiangchuan Road, Shanghai, Minhang District: 200245 Patentee before: Shanghai Heavy Machines Plant Co., Ltd. |
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Effective date of registration: 20161205 Address after: 200245 Jiangchuan Road, Shanghai, No. 230, building 1800, No. Patentee after: Shanghai electric heavy milling special equipment Co. Ltd. Patentee after: Shanghai Heavy Machines Plant Co., Ltd. Address before: 200245 Jiangchuan Road, Shanghai, No. 1800, No. Patentee before: Shanghai Heavy Machines Plant Co., Ltd. Patentee before: Shanghai Heavy Machin Forging Factory Patentee before: Shanghai Heavy-duty Machine Metallurgical Casting Factory Patentee before: Shanghai Heavy Machinery Engineering Co., Ltd. Patentee before: Shanghai Shangzhong Environmental Protection Equipment Engineering Co., Ltd. |