CN103406191A - HP type medium-speed coal mill, and method for reducing pebble coal discharge amount of HP type medium-speed coal mill - Google Patents
HP type medium-speed coal mill, and method for reducing pebble coal discharge amount of HP type medium-speed coal mill Download PDFInfo
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- CN103406191A CN103406191A CN2013103037183A CN201310303718A CN103406191A CN 103406191 A CN103406191 A CN 103406191A CN 2013103037183 A CN2013103037183 A CN 2013103037183A CN 201310303718 A CN201310303718 A CN 201310303718A CN 103406191 A CN103406191 A CN 103406191A
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Abstract
The invention discloses an HP type medium-speed coal mill, and a method for reducing the pebble coal discharge amount of the HP type medium-speed coal mill. A fixing device is arranged on the upper surface of a vane to fix the vane on a mill bowl extending ring. The fixation of the vane on the mill bowl extending ring by the fixing device arranged on the upper surface of the vane puts an end to the vane shedding caused by the wear of the fixing device, so the bypass air quantity greatening is avoided, the vane outlet air speed is guaranteed, the pebble coal discharge amount of the coal mill is greatly reduced, the boiler running economy is improved, the environmental pollution is avoided, and the labor intensity of a worker is reduced.
Description
Technical field
The present invention relates to a kind of HP type medium-speed pulverizer and reduce the method for its stone coal discharge amount.
Background technology
Medium-speed pulverizer is as the Important Auxiliary equipment in power station, because it has small investment, floor space is little, the operation power consumption is low, easy to operate, noise is little, system simply is easy to safeguard, adapt to the advantages such as unit load variations ability is strong, be widely applied in coal-fired power station boiler.HP type medium-speed pulverizer is as wherein having much representational a kind of coal pulverizer, in newly constructed boiler in recent years, is equipped with more.
HP type medium-speed pulverizer operation principle is as follows: on the mill bowl of the center coal-feeding tube feeding rotation of raw coal (diameter is equal to or less than 38 millimeters) through being connected in feeder; Raw coal radially moves to grinding ring outwardly after falling into the mill bowl under the effect of centrifugal force.Due to radially with circumferential movement, raw coal under the Burnisher apparatus can rotate around the axis by the time, the power of milling that spring charging device produces is applied on raw coal by the grinding roller rotated.Burnisher apparatus makes raw coal form coal bed under grinding roller, and pulverizes between bull ring and grinding roller.In the process of lapping of raw coal, less lighter former coal particle is next from the mill bowl, blowing afloat continuously by the pumped (conveying) medium of gaseous state (as hot-air or flue gas).Hot-air enters under mill bowl, hot-air is by the flow through external diameter of rotating grinding bowl of the annular space around the mill bowl, is contained in the air-flow that the blade (being called impeller) on the mill bowl forms hot-air and is tending towards vertical direction.Be in air-flow that the less lighter coal grain on mill bowl external diameter formed by hot-air and carry and move upward, the external foreign material that are difficult for grinding that quality is heavier pass the air-flow that hot-air forms and fall into the side body area.These external foreign material scan out coal pulverizer by the side organism soleplate by being contained in the screeding device rotated on the skirt closure assembly, finally enter pebble coal and discharge system.
As can be known from the operation principle of above-mentioned HP type medium-speed pulverizer, the discharge of pebble coal is relevant with the air velocity at coal pulverizer vane place, and air velocity is large, all corresponding minimizings of the discharge capacity of pebble coal and caloric value.Therefore, the pebble coal discharge capacity of the HP type medium-speed pulverizer of normal operation is less, and the caloric value of pebble coal is lower.Yet due to coal-fired market shortages in recent years, ature of coal is variation gradually, ash content rises, and polishing machine strengthens.As shown in Figure 1, the vane 1 of existing coal pulverizer adopts the side fixed form, and the bolt that vane 1 arranges by side is separately fixed at mill bowl extended loop 2 and impeller is regulated on cover 3.And along with the enhancing of ature of coal polishing machine, the fixture of vane 1 very easily is subject to washing away for a long time of breeze airflow and causes serious wear even to come off, and causes the bypass gas flow amount to increase, and reduces by the air quantity of vane aditus laryngis, vane 1 exit wind speed reduces, and finally causes coal pulverizer pebble coal amount to increase.
Long-term site inspection discovery, along with the ature of coal variation, the pebble coal amount that coal pulverizer is discharged significantly increases, and in pebble coal, contains a large amount of uts, causes the caloric value of pebble coal to raise, and badly influences the economy of boiler operatiopn; A large amount of discharges of pebble coal simultaneously also pollute site environment, and have greatly increased field personnel's labour intensity.
Summary of the invention
The purpose of this invention is to provide a kind of HP type medium-speed pulverizer and reduce the method for its stone coal discharge amount, can significantly reduce the stone coal discharge amount of coal pulverizer, promote Boiler Economical Operation, avoid simultaneously environmental pollution, alleviate staff's labour intensity.
The present invention adopts following technical proposals:
A kind of HP type medium-speed pulverizer, comprise vane, and described vane upper surface is provided with fixture vane is fixed on mill bowl extended loop.
Described fixture adopts bolt.
The top and the bottom of described vane add deflector in the face of the position of breeze airflow.
Fixture by the setting of vane upper surface is fixed on vane on mill bowl extended loop.
Reduce the method for HP type discharge capacity of cobble coal of intermediate-speed coal mill, the position of facing breeze airflow in the top and the bottom of described vane installs deflector additional.
Described fixture adopts bolt.
The present invention is fixed on vane on mill bowl extended loop by the fixture of vane upper surface setting, can stop to cause vane to come off because of the fixture wearing and tearing, thereby avoid the bypass air quantity to become large, guarantee vane outlet wind speed, significantly reduce the stone coal discharge amount of coal pulverizer, promote Boiler Economical Operation, avoid simultaneously environmental pollution, alleviate staff's labour intensity; Further; the position that the present invention faces breeze airflow in the top and the bottom of vane installs deflector additional; it is not frayed that protection vane and impeller are regulated the fixture of covering; can further stop to cause vane to come off because of fixture wearing and tearing, eliminate the hood-shaped seal clearance become of base liner plate, middle liner plate lower surface and impeller adjusting.
The accompanying drawing explanation
Fig. 1 is the fixed form of existing coal pulverizer vane;
Fig. 2 is the fixed form schematic diagram of coal pulverizer vane of the present invention.
The specific embodiment
As shown in Figure 2, HP type medium-speed pulverizer of the present invention comprises vane 1, and vane 1 upper surface is provided with fixture 5 vane 1 is fixed on mill bowl extended loop 2.In the present embodiment, fixture 5 can adopt bolt.Simultaneously, the position in the face of breeze airflow adds deflector 6 in the top and the bottom of described vane 1 in the present invention.Because the present invention is changed to vane 1 upper surface by fixture 5 from vane 1 side that very easily is subject to the breeze airflow erosive wear, can stop because fixture 5 wearing and tearing cause vane 1 to come off, thereby avoid the bypass air quantity to become large, vane 1 outlet wind speed reduces.Simultaneously, the position that the present invention faces breeze airflow in the top and the bottom of vane 1 adds deflector 6, protected vane 1 not frayed with the fixture of impeller adjusting cover 3, can further stop to cause vane 1 to come off because of vane 1 and the fixture wearing and tearing of impeller adjusting cover 3, eliminate base liner plate 4, middle liner plate lower surface and impeller are regulated the seal clearance that cover 3 forms, thereby improve HP type medium-speed pulverizer vane 1 place's outlet wind speed, significantly reduce the stone coal discharge amount of coal pulverizer, promote Boiler Economical Operation, avoid simultaneously environmental pollution, alleviate staff's labour intensity.
The method of reduction HP type discharge capacity of cobble coal of intermediate-speed coal mill of the present invention, comprise that the fixture 5 by vane 1 upper surface setting is fixed on vane 1 on mill bowl extended loop 2; And the position of facing breeze airflow in the top and the bottom of described vane 1 installs deflector 6 additional.
Claims (6)
1. a HP type medium-speed pulverizer, comprise vane, it is characterized in that: described vane upper surface is provided with fixture vane is fixed on mill bowl extended loop.
2. HP type medium-speed pulverizer according to claim 1, is characterized in that: described fixture employing bolt.
3. HP type medium-speed pulverizer according to claim 1 and 2 is characterized in that: the top and the bottom of described vane add deflector in the face of the position of breeze airflow.
4. method that reduces HP type discharge capacity of cobble coal of intermediate-speed coal mill is characterized in that: the fixture by the setting of vane upper surface is fixed on vane on mill bowl extended loop.
5. the method for reduction according to claim 4 HP type discharge capacity of cobble coal of intermediate-speed coal mill is characterized in that: the position in the top and the bottom of described vane in the face of breeze airflow installs deflector additional.
6. according to the method for the described reduction of claim 4 or 5 HP type discharge capacity of cobble coal of intermediate-speed coal mill, it is characterized in that: described fixture adopts bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103037183A CN103406191A (en) | 2013-07-19 | 2013-07-19 | HP type medium-speed coal mill, and method for reducing pebble coal discharge amount of HP type medium-speed coal mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103037183A CN103406191A (en) | 2013-07-19 | 2013-07-19 | HP type medium-speed coal mill, and method for reducing pebble coal discharge amount of HP type medium-speed coal mill |
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| CN103406191A true CN103406191A (en) | 2013-11-27 |
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| CN2013103037183A Pending CN103406191A (en) | 2013-07-19 | 2013-07-19 | HP type medium-speed coal mill, and method for reducing pebble coal discharge amount of HP type medium-speed coal mill |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772207A (en) * | 2015-01-30 | 2015-07-15 | 浙江大学 | Guide apparatus of medium speed coal mill vane throat ring |
| CN110404660A (en) * | 2019-07-10 | 2019-11-05 | 大唐东北电力试验研究院有限公司 | A kind of medium-speed pulverizer vane current equalizing structure |
| CN113877715A (en) * | 2021-11-08 | 2022-01-04 | 浙江浙能技术研究院有限公司 | MSET-based method for monitoring abrasion state of easily-abraded part of coal mill of intelligent power plant |
| CN115463736A (en) * | 2022-06-01 | 2022-12-13 | 浙江浙能兰溪发电有限责任公司 | Wing-shaped air ring of coal mill |
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| EP0264103A2 (en) * | 1986-10-15 | 1988-04-20 | STEIN INDUSTRIE Société Anonyme dite: | Guiding device for the vertical air flow at the circumference of a rotating bowl of a vertical roller mill |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772207A (en) * | 2015-01-30 | 2015-07-15 | 浙江大学 | Guide apparatus of medium speed coal mill vane throat ring |
| CN110404660A (en) * | 2019-07-10 | 2019-11-05 | 大唐东北电力试验研究院有限公司 | A kind of medium-speed pulverizer vane current equalizing structure |
| CN113877715A (en) * | 2021-11-08 | 2022-01-04 | 浙江浙能技术研究院有限公司 | MSET-based method for monitoring abrasion state of easily-abraded part of coal mill of intelligent power plant |
| CN113877715B (en) * | 2021-11-08 | 2022-10-14 | 浙江浙能技术研究院有限公司 | MSET-based method for monitoring abrasion state of easily-abraded part of coal mill of intelligent power plant |
| CN115463736A (en) * | 2022-06-01 | 2022-12-13 | 浙江浙能兰溪发电有限责任公司 | Wing-shaped air ring of coal mill |
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Application publication date: 20131127 |