CN202655077U - Returned powder milling dynamic efficient separation system of steel ball coal mill - Google Patents

Returned powder milling dynamic efficient separation system of steel ball coal mill Download PDF

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Publication number
CN202655077U
CN202655077U CN 201220005093 CN201220005093U CN202655077U CN 202655077 U CN202655077 U CN 202655077U CN 201220005093 CN201220005093 CN 201220005093 CN 201220005093 U CN201220005093 U CN 201220005093U CN 202655077 U CN202655077 U CN 202655077U
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powder
coal
milling
returned
dynamic
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李德忠
黄立新
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李德忠
黄立新
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Abstract

The utility model discloses a returned powder milling dynamic efficient separation system of a steel ball coal mill. A dynamic efficient separation device is added to a coarse powder separator of the steel ball coal mill; a returned powder milling device, a returned powder separation device and a qualified coal powder collection device are arranged on a returned powder pipeline; raw coal is milled by the coal mill, conveyed into the dynamic efficient separation device and then separated by the dynamic efficient separation device; qualified coal powder is conveyed to a fine powder collection device and collected, and then falls into a coal powder bin; unqualified coal powder flows into the returned powder milling device through the returned powder pipeline; and when the returned powder milling device processes milled returned powder, hot air and cold air enter the bottom of the returned powder milling device, the dynamic efficient separation device performed separation treatment, the qualified coal powder is conveyed to the qualified coal powder collection device and collected, and falls into the coal powder bin, and the unqualified coal powder enters the returned powder milling device again and is cyclically milled and processed. The returned powder milling dynamic efficient separation system of the steel ball coal mill has the advantages that the adaptability of a powder production system to coal quality change is greatly improved, and meanwhile, requirements of boiler coal consumption change on high output of the powder production system caused by the coal quality change and boiler load change are met.

Description

Low speed coal mill returns the powder dynamic high-efficiency separation system of milling
Technical field
The utility model relates to ball mill pulverizing system, a kind of brand-new powder dynamic high-efficiency separation system of milling that returns, can not only satisfy that boiler load changes and ature of coal changes pulverized coal preparation system is exerted oneself and the requirement of fineness of pulverized coal, and can increase substantially pulverized coal preparation system and exert oneself, reduce fineness of pulverized coal, improve the pulverized coal fineness index.
Background technology
At present, because the coal market price change, the coal-fired ature of coal of heat power plant boiler differs greatly than design coal, thereby causes same load, the boiler fired coal amount significantly increases (increasing more than 20% at least) than design coal, and then causes the pulverized coal preparation system wretched insufficiency of exerting oneself.In order to satisfy boiler load, pulverized coal preparation system has to exerting oneself greatly, moving under the Wind Volume operating mode, the series of problems such as fineness of pulverized coal chap, fly ash combustible material rising, boiler efficiency reduction, pulverized coal preparation system serious wear, the rising of nitrogen oxide discharge capacity like this, have just been caused.
Summary of the invention
In order to solve the contradiction that boiler efficiency reduces and the nitrogen oxide discharge capacity rises that causes because increasing substantially pulverizer capacity and fineness of pulverized coal chap, the utility model provides a kind of brand-new powder dynamic high-efficiency coal dust separation system of milling that returns, this system can not only be when increasing substantially pulverized coal preparation system and exerting oneself, reduce fineness of pulverized coal, and can in the decrease fineness of pulverized coal, suitably improve pulverized coal preparation system and exert oneself.
The technical scheme in the invention for solving the technical problem is: after the raw coal process coal pulverizer milling processing, be transported into the dynamic high-efficiency sorting unit, after the sorting of dynamic high-efficiency sorting unit, qualified coal dust is transported to fine powder and pounces on acquisition means (5), falls into Pulverized Coal Bin after pouncing on collection; Defective coal dust is through powder retrieving pipe, gravity flow enters back the powder milling device, when powder is milled back in time powder milling device processing, hot blast and cold wind enter from going back to powder milling device bottom, carry out sorting process through returning powder dynamic high-efficiency sorting unit again, qualified coal dust is admitted to qualified coal dust and pounces on and fall into Pulverized Coal Bin after acquisition means is pounced on collection, and defective coal dust enters back the powder milling device milling processing that circulates again.
Install the dynamic high-efficiency sorting unit additional at the low speed coal mill mill separator, arrange back the powder milling device in the powder retrieving pipe road, return powder dynamic high-efficiency sorting unit and qualified coal dust is pounced on acquisition means, and the coal dust Pneumatic conveyer.When the coal pulverizer high load capacity normally moves, pulverizer capacity is large, the system ventilation amount is also large, at this moment, the dynamic high-efficiency sorting unit can improve rotating speed according to the rising of coal pulverizer load, guarantees that fineness of pulverized coal is qualified, therefore, Hui Fenliang and sorting unit resistance will inevitably significantly increase, thus the further raising of restriction pulverizer capacity; Be arranged in returning the powder milling device and returning powder dynamic high-efficiency sorting unit on the powder retrieving pipe road, carry out mill in grades and sorting for the defective coal dust (wherein comprising the qualified coal dust about 30%) that the sorting of dynamic high-efficiency sorting unit is got off exactly, cause defective coal dust to be milled into qualified coal dust, simultaneously, return the qualified coal dust that powder dynamic high-efficiency sorting unit also can get off the sorting of dynamic high-efficiency sorting unit and carry out again sorting, to improve the efficiency of separation of dynamic sorting unit, be carried into qualified coal dust by the coal dust Pneumatic conveyer again and pounce on acquisition means, finally fall into Pulverized Coal Bin.Native system is by installing the dynamic high-efficiency sorting unit additional at mill separator, add in the powder retrieving pipe road and to reinstall the powder milling device and to return powder dynamic high-efficiency sorting unit, can regulate fineness of pulverized coal according to boiler load and ature of coal situation of change, guarantee that fineness of pulverized coal is qualified, be conducive to reduce formation of nitrogen oxides; In addition, arrange back on the powder retrieving pipe road that powder milling device, qualified coal dust pounce on acquisition means and coal dust Pneumatic conveyer, can carry out mill in grades, sorting and collection to returning powder, not only increased substantially milling of mill coal pulverizer system exert oneself (more than 30%), and improved the efficiency of separation of coal dust, greatly reduce the unit power consumption of coal pulverizing of ball mill pulverizing system, reach the purpose of energy-saving and emission-reduction.
When adopting the dynamic high-efficiency sorting unit that fineness of pulverized coal is carried out online in real time adjustment, design arrangement returning the powder milling device and returning the powder sorting unit on the powder retrieving pipe road, can carry out mill in grades to the defective coal dust that the high-efficiency dynamic meal divides outstanding device sorting to get off, simultaneously, utilize back the dynamic sorting unit of powder that the powder that returns after milling is carried out again sorting, qualified coal dust is pounced on acquisition means through fine powder and is fallen into Pulverized Coal Bin, and defective coal dust recycles mills, sorting finally reaches qualified coal dust.Therefore, this system can reduce coal dust sorting circulating ratio, improves the efficiency of separation and pulverized coal fineness, and then increases substantially pulverizer capacity, and reduce fineness of pulverized coal, reduces the nitrogen oxide discharge capacity, to reach the purpose of energy-saving and emission-reduction.
The low speed coal mill that adopts the static separation device is undergone technological transformation, be about to former static separation device, transform back the powder dynamic high-efficiency coal dust separation system of milling as.
Be directly used in new design low speed coal mill bin storage type pulverizing system.Being about to former low speed coal mill the ball type pulverizer system is designed to low speed coal mill and returns the powder dynamic high-efficiency coal dust separation system of milling.
Compare with traditional ball mill pulverizing system, main feature of the present utility model is:
1. adopt the dynamic high-efficiency sorting unit, traditional mill separator is transformed, but real-time online is regulated fineness of pulverized coal, and improve the efficiency of separation.
2. adopt back the powder milling device, will return powder and carry out mill in grades, reduce the sorting unit circulating ratio, improve the pulverized coal fineness index.
3. adopt back powder dynamic high-efficiency sorting unit, the powder that returns through mill in grades is carried out again sorting, improve pulverizer capacity.
4. adopt qualified coal dust to pounce on acquisition means, qualified coal dust is collected, be stored in Pulverized Coal Bin.
5. new pulverized coal preparation system of the common composition of native system and traditional pulverized coal preparation system can move simultaneously, the native system of also can stopping transport, but traditional pulverized coal preparation system isolated operation is independent of each other.
The invention has the beneficial effects as follows and significantly improved the adaptive capacity that pulverized coal preparation system changes ature of coal, simultaneously, satisfied the requirement of pulverized coal preparation system being exerted oneself and promoting because of the boiler fired coal quantitative change that ature of coal changes and the boiler load variation causes.The utility model also can be applicable to the material of the industries such as cement, metallurgy, petrochemical industry and mills and separation system.
The utility model also can be applicable to the material of the industries such as cement, metallurgy, petrochemical industry and mills and separation system.
Description of drawings
Accompanying drawing is that low speed coal mill returns the powder dynamic high-efficiency separation system figure that mills
0---raw coal; 1---feeder; 2---down drying pipe; 3---coal pulverizer; 4---the dynamic high-efficiency sorting unit;
5---fine powder is pounced on acquisition means; 6---powder retrieving pipe; 7---return the powder milling device; 8---return powder dynamic high-efficiency sorting unit;
9---qualified coal dust is pounced on acquisition means; 10---mill exhauster; 11---tertiary air; 12---Pulverized Coal Bin; 13---hot blast;
14---cold wind.
The specific embodiment
Raw coal 0 carries through feeder 1 and down drying pipe 2 is admitted to coal pulverizer 3, simultaneously, hot blast 13 and cold wind 14 enter coal pulverizer 3 through down drying pipe 2, after raw coal process coal pulverizer 3 milling processing, be transported into dynamic high-efficiency sorting unit 4, after 4 sortings of dynamic high-efficiency sorting unit, qualified coal dust is transported to fine powder and pounces on acquisition means 5, falls into Pulverized Coal Bin 12 after pouncing on collection; Defective coal dust is through powder retrieving pipe 6, gravity flow enters back powder milling device 7, when powder is milled back in 7 processing of time powder milling device, hot blast 13 and cold wind 14 enter from going back to powder milling device 7 bottoms, carry out sorting process through returning powder dynamic high-efficiency sorting unit 8 again, qualified coal dust is admitted to qualified coal dust and pounces on and fall into Pulverized Coal Bin 12 after acquisition means 9 is pounced on collection, and defective coal dust enters back powder milling device 7 milling processing that circulates again, until qualified.This system is the negative pressure operational system, and system's operation power provides by mill exhauster 10, and the weary gas that exports from mill exhauster is tertiary air 11, is admitted to burner hearth and participates in burning.
When adopting the dynamic high-efficiency sorting unit that fineness of pulverized coal is carried out online in real time adjustment, design arrangement returning the powder milling device and returning the powder sorting unit on the powder retrieving pipe road, can carry out mill in grades to the defective coal dust that the high-efficiency dynamic meal divides outstanding device sorting to get off, simultaneously, utilize back the dynamic sorting unit of powder that the powder that returns after milling is carried out again sorting, qualified coal dust is pounced on acquisition means through fine powder and is fallen into Pulverized Coal Bin, and defective coal dust recycles mills, sorting finally reaches qualified coal dust.Therefore, this system can reduce coal dust sorting circulating ratio, improves the efficiency of separation and pulverized coal fineness, and then increases substantially pulverizer capacity, and reduce fineness of pulverized coal, reduces the nitrogen oxide discharge capacity, to reach the purpose of energy-saving and emission-reduction.

Claims (1)

1. a low speed coal mill returns the powder dynamic high-efficiency separation system of milling, it is characterized in that: after raw coal process coal pulverizer (3) milling processing, be transported into dynamic high-efficiency sorting unit (4), after dynamic high-efficiency sorting unit (4) sorting, qualified coal dust is transported to fine powder and pounces on acquisition means (5), falls into Pulverized Coal Bin (12) after pouncing on collection; Defective coal dust is through powder retrieving pipe (6), gravity flow enters back powder milling device (7), when powder is milled back in time powder milling device (7) processing, hot blast (13) and cold wind (14) enter from going back to powder milling device (7) bottom, carry out sorting process through returning powder dynamic high-efficiency sorting unit (8) again, qualified coal dust is admitted to qualified coal dust and pounces on and fall into Pulverized Coal Bin (12) after acquisition means (9) is pounced on collection, and defective coal dust enters back powder milling device (7) milling processing that circulates again.
CN 201220005093 2012-01-09 2012-01-09 Returned powder milling dynamic efficient separation system of steel ball coal mill Active CN202655077U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103203272A (en) * 2013-04-15 2013-07-17 黄立新 Storage type superfine pulverized coal preparation system in steel ball coal mill
CN103216841A (en) * 2013-04-19 2013-07-24 国家电网公司 Size grading pulverized coal preparation system
CN103480479A (en) * 2013-09-29 2014-01-01 山东奥能电力科技有限公司 Control device of ball mill
CN103537355A (en) * 2013-10-11 2014-01-29 陕煤集团神木张家峁矿业有限公司 System and method for preparing ultrafine pulverized coal
CN106179629A (en) * 2016-07-09 2016-12-07 青岛大学 A kind of grinding chemical mechanical system of double-layered bucket wall
CN106179631A (en) * 2016-07-09 2016-12-07 青岛大学 A kind of grinding chemical mechanical system of Double-directional rotary

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103203272A (en) * 2013-04-15 2013-07-17 黄立新 Storage type superfine pulverized coal preparation system in steel ball coal mill
CN103203272B (en) * 2013-04-15 2014-10-15 黄立新 Storage type superfine pulverized coal preparation system in steel ball coal mill
CN103216841A (en) * 2013-04-19 2013-07-24 国家电网公司 Size grading pulverized coal preparation system
CN103216841B (en) * 2013-04-19 2016-03-09 国家电网公司 Grading coal dust preparation system
CN103480479A (en) * 2013-09-29 2014-01-01 山东奥能电力科技有限公司 Control device of ball mill
CN103480479B (en) * 2013-09-29 2016-02-24 山东奥能电力科技有限公司 A kind of control device of ball mill
CN103537355A (en) * 2013-10-11 2014-01-29 陕煤集团神木张家峁矿业有限公司 System and method for preparing ultrafine pulverized coal
CN103537355B (en) * 2013-10-11 2015-06-17 陕煤集团神木张家峁矿业有限公司 System and method for preparing ultrafine pulverized coal
CN106179629A (en) * 2016-07-09 2016-12-07 青岛大学 A kind of grinding chemical mechanical system of double-layered bucket wall
CN106179631A (en) * 2016-07-09 2016-12-07 青岛大学 A kind of grinding chemical mechanical system of Double-directional rotary
CN106179631B (en) * 2016-07-09 2018-05-11 青岛大学 A kind of grinding chemical mechanical system of Double-directional rotary
CN106179629B (en) * 2016-07-09 2018-05-11 青岛大学 A kind of grinding chemical mechanical system of double-layered bucket wall

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EE01 Entry into force of recordation of patent licensing contract

Assignee: Xi'an Forrest electric power technology limited liability company

Assignor: Li Dezhong|Huang Lixin

Contract record no.: 2014610000127

Denomination of utility model: Returned powder milling dynamic efficient separation system of steel ball coal mill

Granted publication date: 20130109

License type: Exclusive License

Record date: 20140902

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Inventor after: Li Zongxu

Inventor after: Li Dezhong

Inventor after: Huang Lixin

Inventor before: Li Dezhong

Inventor before: Huang Lixin

COR Change of bibliographic data
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Addressee: Huang Lixin

Document name: Notification of Passing Examination on Formalities