2025/6/2114.3Pulverizationsystem
§4-3制粉系统Pulverizationsystemisimportantsystemforapowerplant.Thearrangementofcoal-firedsystemcomponentsmustdeterminedaccordingtoeconomicfactorsaswellastheattributesofthecoal.Theperformanceintermsofproductfineness,milloutlettemperature,andair-coalratiomustallbedeterminedaspartofoverallcombustionsystemdesign.
2025/6/2124.3Pulverizationsystem
§4-3制粉系统Pulverizationsystemsarepartoflargersubsystemofboiler,normallyclassifiedastwotypes:Direct-firedsystem(直吹式):coalleavingeachmillgoesdirectlytothecombustionprocess.Theair,evaporatedmoisture,andthermalenergywhichenteredthemill,alongwiththegroundcoal,allbecomepartofthecombustionprocess.Storagesystems(仓储式):separatethegroundcoalfromtheairorgas,evaporatedmoistureandthethermalenergypriortothecombustionprocess.Storedgroundcoalistheninjectedwithnewtransportairorgastocombustionprocess.
2025/6/2134.3Pulverizationsystem
§4-3制粉系统1.direct-firedsystem直吹式制粉系统Theessentialelementsofadirect-firedsystem:Arawcoalfeederthatregulatesthecoalflowfromthesiloorbunkertothepulverizer.AheatsourcethatpreheatstheprimaryairforcoaldryingApulverizer(primary)fanthatistypicallylocatedaheadofthemill(pressurizedmill)asablower,orafterthemill(suctionmill)asaexhauster.Apulverizer,configuredaseitherapressurizedorsuctionunitPipingthatdirectsthecoalandprimaryairfromthepulverizertotheburnersControlsandregulatingdevices.
2025/6/2144.3Pulverizationsystem
§4-3制粉系统
2025/6/2154.3Pulverizationsystem
§4-3制粉系统1.direct-firedsystem直吹式制粉系统(Fig13-9/10)Pressurizedsystem:Ablowerislocatedaheadofthemill(图4-11) 正压系统:排粉机布置在磨煤机后，磨煤机中的煤粉通过排粉机抽出Suctionsystem:exhausterislocatedafterthemill 分负压:一次风机布置在磨煤机前，煤粉通过一次风机吹出。
2025/6/2164.3Pulverizationsystem
§4-3制粉系统2.Storagesystems中间储仓式制粉系统1)Hotai