CN101947484B - Method for reducing discharge capacity of cobble coal of intermediate-speed coal mill - Google Patents

Method for reducing discharge capacity of cobble coal of intermediate-speed coal mill Download PDF

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Publication number
CN101947484B
CN101947484B CN2010102777952A CN201010277795A CN101947484B CN 101947484 B CN101947484 B CN 101947484B CN 2010102777952 A CN2010102777952 A CN 2010102777952A CN 201010277795 A CN201010277795 A CN 201010277795A CN 101947484 B CN101947484 B CN 101947484B
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China
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coal
ring
vane
speed
discharge capacity
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CN2010102777952A
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Chinese (zh)
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CN101947484A (en
Inventor
裘立春
吴常苗
洪道文
常毅君
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浙江省电力试验研究院
华能国际电力股份有限公司玉环电厂
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Priority to CN2010102777952A priority Critical patent/CN101947484B/en
Publication of CN101947484A publication Critical patent/CN101947484A/en
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Abstract

The invention relates to a method for reducing the discharge capacity of cobble coal of an intermediate-speed coal mill. Due to the trend of diversification and poor quality of coal, the coal for practical combustion in an electric power plant is poor, and the discharge capacity of the cobble coal of the coal mill is increased obviously and the normal coal is carried over. In the method, the conventional intermediate-speed coal mill is improved. The method is characterized in that a vertically-arranged diversion ring is arranged at a vane in the intermediate-speed coal mill; a separator is arranged above the vane; the bottom of the diversion ring is connected to the end face on the upper part of the vane; the top surface of the diversion ring is higher than the bottom surface of a separator area; and high-speed rotating airflow at the vane are not influenced by horizontal high-speed airflow from a gap of dynamic and static rings through the diversion ring, so the discharge capacity of the cobble coal is reduced obviously.

Description

A kind of method that reduces medium-speed pulverizer stone coal discharge capacity
Technical field
The present invention relates to a kind of method that is used to reduce the stone coal discharge capacity of medium-speed pulverizer.
Background technology
Because socioeconomic continuous development, society increases fast to resource requirement, and electric coal supply also becomes
In anxiety, the continuous rise of coal price has directly caused the increase of cost of electricity-generating, and the electricity price joint-action mechanism is subjected to the influence of national macroeconomic environment and lag behind.Everything has all caused huge operated pressure to electricity power enterprise, and enterprise profit declines to a great extent even loss occurs.The work that electricity power enterprise can carry out is exactly to reduce specific energy consumption, reduce cost of electricity-generating as far as possible.Therefore, the energy saving in running of fired power generating unit consumption reduction has become the desirability of Business survival.
Because both at home and abroad the coal market has greatly changed in recent years, the rising steadily of coal price, the categories of coal diversification, Coal Quality has greatly changed, and has increased the fuel cost of power plant's generating greatly.
Medium-speed pulverizer is the coal pulverizer that a kind of roller-plate loads, and mainly is made up of reductor and basis, casing, support labyrinth seal, nozzle ring device, mill, grinding roller, mill inner spring charger or hydraulic loading device, separator and sealing wind system.Raw coal falls into the mill center of rotation from coal spout, the track of milling that enters grinding roller and mill under action of centrifugal force is milled into coal dust by roll extrusion, heated-air drying that coal dust is sprayed into from nozzle ring and clockwise spiral rise and send into separator, coal dust qualified after separating is sent into burner hearth, the stone coal is fallen into a hot blast chamber and is scraped into dreg discharging box through the nozzle ring aditus laryngis, after ash gate discharge.
Coal pulverizer is used for grinding raw coal, and it is reached can be at the fineness of pulverized coal of stove internal combustion requirement.On the mill bowl of raw coal (diameter is equal to or less than 38 millimeters) via the center coal-feeding tube feeding rotation that is connected in feeder.Coal-supplying amount is according to the generated energy of generating set, and ature of coal and the coal pulverizer platform number that puts into operation is determined automatically.After raw coal fell into the mill bowl, radial outward moved to grinding ring in the action of centrifugal force lower edge.Because radially with circumferential moving, coal can pass through under the Burnisher apparatus of the passive rotation of axle, thus, the power of milling that charger produces is applied on the coal by the grinding roller that rotates.Burnisher apparatus makes coal form coal bed under grinding roller, and pulverizes between mill bowl liner plate and grinding roller.In the process of lapping of coal, less lighter particle is blown afloat from the mill bowl by the pumped (conveying) medium of gaseous state (hot-air or flue gas) continuously.Air has three effects: at first, heated air carries out drying to coal in the stone roller system process of coal dust makes it be easy to grind; The second, it provides necessary power to make coal dust separate (control outlet fineness of pulverized coal) in coal pulverizer; The 3rd, air is transported to burner hearth to coal dust from grinding machine.
Carry air to be supplied with by the primary air fan that is positioned at the coal pulverizer upstream, primary air fan provides malleation.Hot-air enters under grinding bowl, and air is flowed through by the annular space around the mill bowl and rotated the outer radius of mill bowl.The blade that is contained on the mill bowl makes air-flow be tending towards direction vertically upward.Less lighter coal grain at mill bowl external diameter is carried upwards by air-flow, and the heavy external foreign material that are difficult for grinding pass air-flow and fall into the side body area.At this, external foreign material are reverse to scan out coal pulverizer by the side organism soleplate by the screeding device on the mill bowl hub that is contained in rotation, enters the stone coal then and discharges system.External foreign material are made up of the metal parts of ragstone in the coal seam and mining machines usually.Therefore these foreign material that enter coal pulverizer are reduced to minimum being good.What rotation was risen on the mill bowl experiences a two-stage separation process than the light coal grain.Be installed in the fixing air jet deflector that separates on the body owing to used, first order separation just in time takes place on mill bowl horizontal plane.At this, the heaviest coal grain directly returns the mill bowl and further is milled into littler particle.And lighter particle is carried into separator by air-flow and carries out the second level and separate, and Xuan Zhuan blade makes larger particles landing from coal stream herein, and the qualified coal dust of fineness enters coal pipe by blade, and coal pipe burns wind powder mixture introducing burner hearth.
Because the trend of coal diversification and poor qualityization causes the actual coal variation that uses of power plant, further cause the stone coal of pulverized coal preparation system significantly to become many, and take normal coal out of.The content of coal is too much in the stone coal, and this is a kind of situation of danger.Because coal can stop up the stone coal and discharge, in the side body, pile up the very big hidden danger of getting up to cause mill fire.Coal pulverizer stone coal spill-out too much can make the wearing and tearing of air inlet blade tip, need change or repair during serious wear.
Summary of the invention
Technical problem to be solved by this invention is to overcome the defective that above-mentioned prior art exists; a kind of method that reduces medium-speed pulverizer stone coal discharge capacity is provided,, optimizes coal-fired structure to reduce the discharge capacity of stone coal; prolong the service life of coal pulverizer, guarantee unit safety stable operation.
For this reason, the technical solution used in the present invention is: a kind of method that reduces medium-speed pulverizer stone coal discharge capacity, it is characterized in that: the one vertical guide ring that is provided with is installed at the inner vane of coal pulverizer place, the top of coal pulverizer vane is provided with separator, the bottom of described guide ring is connected on the end face on vane top, the end face of guide ring is higher than the bottom surface of separator region, guarantee that by guide ring the high speed swirling eddy at vane place is not subjected to the influence of horizontal high velocity air from the dynamic and static ring gap, thereby significantly reduce the discharge capacity of stone coal, can reduce about 40-50%.
As the further of technique scheme improved and replenish, the present invention takes following technical measures:
Above-mentioned method, the madial wall of vane is provided with a restrictor ring, it is integral structure or continuous multi-segment structure, the cross section of restrictor ring is triangular in shape, leg-of-mutton one side is connected on the madial wall of vane, the effect of restrictor ring is the air velocity that improves the vane place, thereby further reduces stone coal discharge capacity; Described vane is formed by inner ring body, outer ring body and with the polylith blade that inside and outside ring body is connected as a single entity, the height of restrictor ring and blades height coupling, the width of restrictor ring is the 10-30% of inside and outside ring body spacing, make the air velocity at vane place maintain 45-70m/s, speed promotes about 20-45%.
After the present invention increases restrictor ring, the about 300~500pa of coal pulverizer pressure reduction will be improved, and negative effect can be do not constituted for operation.
The present invention is applicable to and grinds all kinds of coals, as anthracite, bituminous coal and meager coal and ub-bituminous coal, brown coal, comprises import coal and state's producing coal, and described various coals do not limit for ash, moisture content, fugitive constituent and the Ha Shi grindability coefficient etc. of coal; Be suitable for dissimilar medium-speed pulverizers, as HP, RP, MBF, E and MPS type mill etc.; For the nominal output magnitude range of coal pulverizer, can be from 20t/h~150t/h, and the more large-scale coal pulverizer of development in the future, and comprise the coal pulverizer of industries such as thermal power plant and other iron and steel, cement, chemical industry; Be suitable for the coal pulverizer that contains or do not contain dynamic separator, the coal pulverizer of methods such as hydraulic loaded or mechanical load.
Beneficial effect of the present invention: guide ring effectively reduces the stone coal discharge capacity of medium-speed pulverizer, prolongs the service life of coal pulverizer, has guaranteed unit safety stable operation; Substantially do not increasing under the prerequisite of coal pulverizer resistance, reducing the draught area at vane place, promoting the air velocity at vane place, thereby further reduced stone coal discharge capacity by restrictor ring.
The invention will be further described below in conjunction with specification drawings and specific embodiments.
Description of drawings
Fig. 1 is the partial structurtes schematic diagram of medium-speed pulverizer of the present invention.
Fig. 2 is the partial structurtes schematic diagram of existing medium-speed pulverizer.
Fig. 3 is the structural representation at medium-speed pulverizer vane of the present invention place.
Fig. 4 is the structural representation at existing medium-speed pulverizer vane place.
Among the figure, 1-guide ring, 2-separator, 3-restrictor ring, 4-inner ring body, 5-outer ring body, 6-blade.
The specific embodiment
Medium-speed pulverizer shown in Fig. 1,3, the coal dust that the high speed swirling eddy carries through milling blows to separator through vane, the coal dust that reaches granularity requirements is admitted to boiler through behind the separator by tube cell, and the coal dust that does not reach granularity requirements will fall back to and continue in the coal pulverizer to mill.The vertical guide ring 1 that is provided with is installed at the place at the inner vane of coal pulverizer, guide ring is the non-individual body of an atresia, the top of coal pulverizer vane is provided with separator 2, the bottom of described guide ring is connected on the end face on vane top, the end face of guide ring is higher than the bottom surface of separator 2, and the high speed swirling eddy direction of guaranteeing the vane place by guide ring is for vertically upward, is not subjected to the influence of horizontal high velocity air from the dynamic and static ring gap, thereby significantly reduce the discharge capacity of stone coal, can reduce about 40-50%; Simultaneously, the resistance of a wind will be descended greatly, thereby the power consumption of primary air fan is descended.The blast at vane place and the distribution of wind speed fall may descending greatly of being repeated to mill also with relative more even after rise thereby make the coal dust that reaches granularity requirements through milling effectively not separate by separator.
The madial wall of described vane is provided with a restrictor ring 3, and it is an integral structure, and the cross section of restrictor ring is triangular in shape, one side on the leg-of-mutton madial wall that is connected vane.Described vane is formed by inner ring body 4, outer ring body 5 and with the polylith blade 6 that inside and outside ring body is connected as a single entity, the height of restrictor ring and blades height coupling, the width of restrictor ring 3 is the 10-30% of inside and outside ring body spacing, makes the air velocity at vane place approximately maintain 55-60m/s.

Claims (2)

1. method that reduces medium-speed pulverizer stone coal discharge capacity, it is characterized in that: the one vertical guide ring that is provided with is installed at the inner vane of coal pulverizer place, this guide ring is the non-individual body of an atresia, the top of coal pulverizer vane is provided with separator, the bottom of described guide ring is connected on the end face on vane top, the end face of guide ring is higher than the bottom surface of separator region, guarantees that by guide ring the high speed swirling eddy at vane place is not subjected to the influence of horizontal high velocity air from the dynamic and static ring gap.
2. method according to claim 1 is characterized in that the madial wall of described vane is provided with a restrictor ring, and it is integral structure or continuous multi-segment structure, and the cross section of restrictor ring is triangular in shape, one side on the leg-of-mutton madial wall that is connected vane; Described vane is formed by inner ring body, outer ring body and with the polylith blade that inside and outside ring body is connected as a single entity, the height of restrictor ring and blades height coupling, the width of restrictor ring is the 10-30% of inside and outside ring body spacing, makes the air velocity at vane place maintain 45-70m/s.
CN2010102777952A 2010-09-10 2010-09-10 Method for reducing discharge capacity of cobble coal of intermediate-speed coal mill CN101947484B (en)

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CN102764687B (en) * 2011-05-03 2015-01-28 华东电力试验研究院有限公司 Medium speed mill primary separation dynamic regulating system and its regulating method
CN102896023A (en) * 2012-10-23 2013-01-30 中国神华能源股份有限公司 Bowl type coal mill
CN104096630B (en) * 2013-04-08 2016-08-24 国家电网公司 A kind of bottom of medium-speed mill structure
CN103406191A (en) * 2013-07-19 2013-11-27 国家电网公司 HP type medium-speed coal mill, and method for reducing pebble coal discharge amount of HP type medium-speed coal mill
CN103567018A (en) * 2013-11-12 2014-02-12 北京新源宝通电力设备有限公司 Rotating nozzle structure of RP coal mill
CN106423415B (en) * 2016-07-22 2018-06-26 天津水泥工业设计研究院有限公司 A kind of vane structure of vertical roll grinder

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JP2751980B2 (en) * 1992-05-22 1998-05-18 宇部興産株式会社 Vertical crusher
CN100408190C (en) * 2005-12-22 2008-08-06 上海重型机器厂有限公司 Bowl-type medium speed coal mill
CN201534101U (en) * 2009-10-28 2010-07-28 石福军 Bowel-type medium speed coal mill

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Owner name: YUHUAN ELECTRIC POWER PLANT,HUANENG POWER INTERNAT

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Address after: The eight district of Hangzhou city in Zhejiang province 310014 Huadian Zhaohui under No. 1 Lane

Patentee after: Electric Power Science Research Institute of Zhejiang Electric Power Company

Patentee after: Yuhuan Electric Power Plant,Huaneng Power International, Inc.

Address before: The eight district of Hangzhou city in Zhejiang province 310014 Huadian Zhaohui under No. 1 Lane

Patentee before: Zhejiang Electric Power Test And Research Insititute

Patentee before: Yuhuan Electric Power Plant,Huaneng Power International, Inc.

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Address after: The eight district of Hangzhou city in Zhejiang province 310014 Huadian Zhaohui under No. 1 Lane

Patentee after: Electric Power Science Research Institute of Zhejiang Electric Power Company

Patentee after: Yuhuan Electric Power Plant,Huaneng Power International, Inc.

Patentee after: State Grid Corporation of China

Address before: The eight district of Hangzhou city in Zhejiang province 310014 Huadian Zhaohui under No. 1 Lane

Patentee before: Electric Power Science Research Institute of Zhejiang Electric Power Company

Patentee before: Yuhuan Electric Power Plant,Huaneng Power International, Inc.

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