2025/6/211PulverizerdesignrequirementsManydifferentpulverizerdesignshavebeenappliedtocoalfiring.Successfuldesignshavemetcertainfundamentalgoalsandrequirements:optimumfinenessfordesigncoalsovertheentirepulverizeroperatingrange,rapidresponsetoloadchanges,stableandsafeoperationovertheentireloadrange,continuousserviceoverlongoperatingperiods,acceptablemaintenancerequirements,particularlygrindingelements,overthepulverizerlife,abilitytohandlevariationsincoalproperties,easeofmaintenance(minimumnumberofmovingpartsandadequateaccess),andminimumbuildingvolume.4.2Pulverizeranditsproperties
§4-2磨煤设备及其特性
2025/6/2124.2Pulverizeranditsproperties
§4-2磨煤设备及其特性1.MechanismandclassificationofPulverizer磨煤机的作用机理和分类Pulverizeristhemainequipmentofpulverizationsystem,whoseworkingcharacteristicsisveryimportanttocoalfineness,capacity,electricityconsumption,metalconsumption,etc. 磨煤机是煤粉制备系统中主要设备，其工作性能对煤粉细度、煤粉出力、磨煤电耗、磨煤机金属耗量和干燥煤粉的能力等都有很大的影响。
2025/6/213Grindingmechanism破碎机理：压碎crush击碎impact,hit,punch研碎attrition,trituration,whichisdominantsizereductionmechanism4.2Pulverizeranditsproperties
§4-2磨煤设备及其特性
2025/6/2144.2Pulverizeranditsproperties
§4-2磨煤设备及其特性Basedonrotatevelocity根据转速分为：LowspeedPulverizer:n=16~20r/minball-and-tubemill球磨机ModeratespeedPulverizer:n=50~300r/min平盘式磨煤机、环球式、碗式、MPS磨煤机等HighspeedPulverizer:n=500~1500r/min风扇式、锤击式
2025/6/2154.2Pulverizeranditsproperties
§4-2磨煤设备及其特性2.Ball-and-tubemill球磨机(pp.48)1)Workingfundamental工作原理(图4-2)Thecylinderislinedwithwearresistant material(衬板)contouredtoenhancethe actionoftumblingballs.Theballsfill25to30%ofthecylindervolume.Therotationalspeedis80%ofthatatwhichcentrifugalforce(离心力)wouldovercomegravityandcausetheballstoclingtotheshellwall.Grindingiscausedbythetumblingactionwhichtrapscoalparticlesbetweenballsasthey