风机计算

烟道阻力及引风机选型改造前改造后当地大气压PkPa102.10102.10标准大气压P0kPa102.100102.100一锅炉本体阻力锅炉本体阻力（包括自生通风、空预器本体烟气阻力）△H1mmH2O锅炉厂提供325.00325.00二空预器出口至除尘脱硫岛进口空预器出口烟气量Vm3/s燃烧计算书得78.2878.28空预器出口烟气密度γkg/m3燃烧计算书得0.84960.8496除尘脱硫岛进口烟气量Vm3/s燃烧计算书得78.2878.28除尘脱硫岛进口烟气密度γkg/m3燃烧计算书得0.84960.84961a1m2.32.3b1m55a2m2.32.3b2m55Lm55θθ＝(artg((b1-b2)/2/L))×20.000.00ξ制粉计算规定(P137表)0.10.1wm/s流速计算书得6.816.81hdmmH2Ohd=w2×γ/(2×g)2.012.01△h1mmH2O△h1=ξ×hd0.200.202am55bm2.32.3Rm2.32.3R/b1.001.00K△ξ0制粉计算规定(P113图)0.280.28a/b2.1742.174Kc制粉计算规定(P111图2)0.880.88Kθ制粉计算规定(P111图1)11ξξ=K△ξ0×Kθ×Kc（P110）0.24640.2464wm/s流速计算书得6.816.81hdmmH2Ohd=w2×γ/(2×g)2.012.01△h2mmH2O△h2=ξ×hd0.490.493am55bm2.32.3Lm2020d0md0=2ab/(a+b)3.153.15λ燃烧及制粉系统计算手册之六0.020.02wm/s流速计算书得6.816.81hdmmH2Ohd=w2×γ/(2×g)2.012.01序号名称符号单位渐缩大小头90°弯头摩擦阻力公式或来源第1页共6页烟道阻力及引风机选型改造前改造后序号名称符号单位公式或来源△h3mmH2O△h3=λ×L×hd/d00.250.255am2.42.4bm33Rm33R/b1.001.00K△ξ0制粉计算规定(P113图)0.280.28a/b0.8000.800Kc制粉计算规定(P111图2)0.990.99Kθ制粉计算规定(P111图1)11ξξ=K△ξ0×Kθ×Kc（P110）0.27720.2772wm/s流速计算书得10.8710.87hdmmH2Ohd=w2×γ/(2×g)5.125.12△h5mmH2O△h5=ξ×hd1.421.426am2.42.4bm33Lm3030d0md0=2ab/(a+b)2.672.67λ0.020.02wm/s流速计算书得10.8710.87hdmmH2Ohd=w2×γ/(2×g)5.125.12△h6mmH2O△h6=λ×L×hd/d01.151.157ξ制粉计算规定(P143)1.11.1wm/s流速计算书得6.216.21hdmmH2Ohd=w2×γ/(2×g)1.671.67△h7mmH2O△h7=ξ×hd1.841.849脱硝△h8mmH2O0.0081.638总阻力△H2mmH2O△H2=△h1+△h2+……+△h76.3688.00三除尘本体阻力△H3mmH2O设备厂提供脱硫除尘数据122122四除尘出口烟气量Vm3/s燃烧计算书得84.9084.90除尘出口烟气密度γkg/m3燃烧计算书得0.51240.5124引风机进口烟气量Vm3/s燃烧计算书得84.9084.90引风机进口烟气密度γkg/m3燃烧计算书得0.51240.51241ξ制粉计算规定(P141表7.3.9)0.500.50wm/s流速计算书得11.7911.79hdmmH2Ohd=w2×γ/(2×g)3.633.6390°弯头摩擦阻力除尘进口除尘出口至引风机进口脱硫塔进口烟道第2页共6页烟道阻力及引风机选型改造前改造后序号名称符号单位公式或来源△h1mmH2O△h1=ξ×hd1.821.822am2.42.4bm33Lm2525d0md0=2ab/(a+b)2.672.67λ0.020.02wm/s流速计算书得11.7911.79hdmmH2Ohd=w2×γ/(2×g)3.633.63△h2mmH2O△h2=λ×L×hd/d00.680.683am2.32.3bm33rm33r/b1.001.00K△ξ0制粉计算规定(P113图)0.280.28a/b0.7670.767Kc制粉计算规定(P111图2)0.90.9Kθ制粉计算规定(P111图1)11ξξ=K△ξ0×Kθ×Kc（P110）0.25200.2520wm/s流速计算书得12.3012.30hdmmH2Ohd=w2×γ/(2×g)3.953.95△h3mmH2O△h3=ξ×hd1.001.008总阻力△H4mmH2O△H4=△h1+△h2+……+△h65.495.49五脱硫本体阻力△H3mmH2O设备厂提供脱硫除尘数据122122六湿电本体阻力△H3mmH2O设备厂提供脱硫除尘数据031七湿电出口至烟囱进口引风机出口烟气量Vm3/s燃烧计算书得74.9774.97引风机出口烟气密度γkg/m3燃烧计算书得0.59330.59331ξ制粉计算规定(P130)0.100.10wm/s流速计算书得10.4110.41hdmmH2Ohd=w2×γ/(2×g)3.283.28△h2mmH2O△h2=ξ×hd0.330.332am2.42.4bm33Rm33R/b11K△ξ0制粉计算规定(P113图)0.280.28a/b0.8000.80090°弯头摩擦阻力90°直角边缓转弯头风门第3页共6页烟道阻力及引风机选型改造前改造后序号名称符号单位公式或来源Kc制粉计算规定(P111图2)1.091.09Kθ制粉计算规定(P111图1)11ξξ=K△ξ0×Kθ×Kc（P110）0.30520.3052wm/s流速计算书得10.4110.41hdmmH2Ohd=w2×γ/(2×g)3.283.28△h3mmH2O△h3=ξ×hd1.001.003am2.32.3bm33Lm2020d0md0=2ab/(a+b)2.602.60λ燃烧及制粉系统计算手册之六0.020.02wm/s流速计算书得10.8710.87hdmmH2Ohd=w2×γ/(2×g)3.573.57△h4mmH2O△h4=λ×L×hd/d00.550.554am1.91.9bm4.34.3Lm77d0md0=2ab/(a+b)2.642.64λ燃烧及制粉系统计算手册之六0.020.02wm/s流速计算书得9.189.18hdmmH2Ohd=w2×γ/(2×g)2.552.55△h4mmH2O△h4=λ×L×hd/d0（P4）0.140.145总阻力△H5mmH2O△H5=△h1+△h2+……+△h54.014.01六烟囱阻力烟气量(两台炉)Vm3/s燃烧计算书得149.94149.94烟气密度γkg/m3燃烧计算书得0.59330.5933烟囱高度Hm120120烟囱出口直径Φm77烟囱出口流速(两台炉)wm/sw=V/(Φ2×π/4)3.903.901烟囱进口局部阻力ξ制粉计算规定(P147表)1.41.4wm/s流速计算书得3.143.14hdmmH2Ohd=w2×γ/(2×g)0.300.30△h1mmH2O△h1=ξ×hd0.420.422烟囱出口局部阻力ξ制粉计算规定(P147表)1.11.1wm/s3.903.90hdmmH2Ohd=w2×γ/(2×g)0.460.46△h2mmH2O△h2=ξ×hd0.510.513烟囱摩擦阻力摩擦阻力摩擦阻力第4页共6页烟道阻力及引风机选型改造前改造后序号名称符号单位公式或来源LmL=H-15105105λ燃烧及制粉系统计算手册之六0.020.02wm/s3.903.90hdmmH2Ohd=w2×γ/(2×g)0.460.46△h3mmH2O△h3=λ×L×hd/Φ0.140.144总阻力△H6mmH2O△H6=△h1+△h2+△h31.061.06七燃烧室出口负压△H7mmH2O22八烟道总阻力1烟道总阻力△HmmH2O△H=△H1+△H2+……+△H6586.65698.87△H300mmH2O,压力修正时考虑其影响2吸入侧烟道总阻力△H'mmH2O△H'=△H1+△H2+……+△H4459.21540.843当地大气压BkPa102.10102.104沿烟道的平均有效压力PmmH2OP=B×1000/9.81-△H'/210178.1410137.335压力修正后烟道总阻力△H修mmH2O△H修=△H×B/P599.88717.51九自生通风1燃烧器出口至空预器出口△h自1mmH2O已计入在锅炉本体阻力中002空预器出口至烟囱出口⑴空预器出口标高h1m12.912.9⑵烟囱出口标高h2m240240⑶空预器出口烟气密度γ1燃烧计算书得0.84960.8496⑷烟囱出口烟气密度γ2燃烧计算书得0.59330.5933⑸烟气平均密度γγ=(γ1+γ2)/20.72150.7215⑹冷风密度（20℃时）γlγl＝1.306×273/(273+20)×P/P01.21691.2169⑺自生通风△h自2mmH2O△h自=(h2-h1)×(γl-γ)112.51112.513合计△h自mmH2O△h自=△h自1+△h自2112.51112.51十系统计算阻力（气压修正后）1系统计算阻力（气压修正后）△H计mmH2O△H计=△H修-△h自+△H7489.37607.01十一引风机选型1引风机进口介质密度⑴风机进口负压P负mmH2OP负＝△H'+△H7461.21542.84PaP负×9.814524.55325.3⑵修正前引风机进口烟气密度γ'kg/m3燃烧计算书得0.51240.5124⑶考虑进口负压修正后引风机进口烟气密度γkg/m3γ=γ'×(B×1000-P负)/(B×1000)0.48970.48572引风机风量⑴修正前风机进口风量V'm3/s燃烧计算书得84.9084.90第5页共6页烟道阻力及引风机选型改造前改造后序号名称符号单位公式或来源⑵考虑进口负压修正后风机进口风量Vm3/sV=V'×γ'/γ88.8489.57⑶取20％裕量（规程规定裕度不小于10％）Vxjm3/sVxj=V×1.20106.61107.49⑷加12℃裕量t℃规程规定另加不低于10℃的温度裕量1212⑸风量Vxj'm3/sVxj'=Vxj×(273+txj+t)/(273+txj)109.74110.65m3/h3950663983353引风机压头⑴修正后的引风机压头PxjmmH2OPxj=△H计489.37607.01PaPxj×9.814800.85954.7⑵取30％裕量（规程规定裕度不小于20％）Pxj'PaPxj'=Pxj×1.306241.07741.2第6页共6页