段6摩擦阻力Pa=29.6Pa局部阻力除尘器出口变径管(渐缩管)除尘器进口尺寸,变径管长度,弯头()2个管内动压PaPa=100.4Pa管段6的阻力Pa=130Pa⑦管段7摩擦阻力Pa=59.2Pa局部阻力根据设计经验,初步选择4-68No.5A风机,风机的出口尺寸为扩散角度按设计定为带扩散管的伞形风帽()管内动压PaPa=117.1Pa管段7的阻力Pa=176.31Pa表一管道水力计算表管段编号流量(m3/h)(m3/s)长度l(m)管径D(mm)流速v(m/s)动压P(Pa)局部阻力系数Σξ局部阻力Z(Pa)单位长度摩擦阻力Rm(Pa/m)摩擦阻力Rml(Pa)摩擦阻力Rml+Z(Pa)1800(0.22)1112020.0240.01.13271.253.0583.0854.232300(0.64)521018.0194.40.5097.221.0105.0202.256300(1.75)436016.0153.60.046.16.827.233.368670(2.40)442016.7167.30.60100.47.429.6130.078670(2.40)842016.7167.30.70117.17.459.2176.321500(0.42)617018.8212.11.66352.027.0162.0514.044000(1.11)628018.0194.41.65320.813.078.0398.8(1)800(0.22)1113517.0173.41.13195.931.0341.0199.2(4)4000(1.11)632014.2130.01.45175.46.539.0214.4除尘器1200对各并联管路进行阻力平衡节点A为使管段1、2达到阻力平衡,要修改原设计管径,重新计算管段阻力,改变管段1的管径。根据公式(8-20),根据通风管道统一规格,取。
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