6-4(除尘风管的最小风速)A输送含有轻矿物粉尘的空气时,风管内最小风速为:垂直风管12m/s,水平风管14m/sB输送含有钢铁物粉尘的空气时,风管内最小风速为:垂直风管13m/s,水平风管15m/sC输送含有重矿物粉尘的空气时,风管内最小风速为:垂直风管14m/s,水平风管16m/s考虑到除尘器及风管漏风,管段6及7计算风量为2.2724×1.05=2.3863m3/s管段1根据(0.5408)m/s由附录9可查出管径和单位长度摩擦阻力。所选管径应尽量符合附录11的通风管道统一规格。D1=220mmRm1=11.13Pa/m管段3根据s/8264.05408.02856.033mL???(2975.04m3/h)143?vm/s由附录6可查出mmD2803?Rm3=7.35Pa/m管段5根据L5=2.2727m3/s(8181.72m3/h)145?v由附录9可查出mmD4505?Rm5=4.61Pa/m管段6根据L6=2.3863m3/s(8590.68m3/h)?6v14m/s由附录9可查出D6=450mmRm6=5.07Pa/m管段710/20根据L7=2.3863m3/s(8590.68m3/h)v7=14m/s由附录9可查出D7=450mmRm7=5.07Pa/m确定管段2、4的管径及单位长度摩擦阻力管段2根据s/2856.032mL?(1028.16m3/h)v2=13m/s由附录9可查出D2=160mmRm2=16.60Pa/m管段4根据s/482.134mL?(5335.2m3/h)v4=14m/s由附录9可查出mmD3604?Rm2=6.3Pa/m3.4确定局部阻力系数查附录7,确定各管段的局部阻力系数。①管段1设备外部吸气罩弯头()一个直流三通(1—3)见直流三通图1根据直流三通示意图1查得②管段2设备接受罩直流三通(2—3)见直流三通图1查得③管段3