供气管计算

项目数量单位备注项目供气强度8L/(m2*s)池子数量2个弯头局部阻力系数池表面积5.82m2干管弯头数量所需空气量（计算值）5.59m3/min支管弯头数量所需空气量（选取）10.0m3/min干管弯头估算风机压力60.0kPa表压，见批注支管弯头干管数量1根大小头局部阻力系数干管管径100mm干管大小头数量干管空气流速13.27m/s支管大小头数量单根干管长度20m小支管大小头数量支管数量2根干管大小头支管管径80mm支管大小头单根支管长度8m若无管，此处填0小支管大小头支管空气流速10.37m/s三通局部阻力系数小支管数量40根干管三通数量小支管管径25mm支管三通数量单根小支管长度2m若无管，此处填0干管三通小支管气流速度5.31m/s支管三通曝气孔蝶阀局部阻力系数曝气孔直径6mm设定，一般4~6mm干管蝶阀数量每根支管孔量10个一般3~5个/m支管蝶阀数量总数量400个小支管蝶阀数量单个曝气孔流量0.0250m3/min干管蝶阀曝气孔流速9.22m/s支管蝶阀小支管蝶阀设计空气温度20℃总局部阻力设计空气压力160kPa表压设计条件下空气密度1.90kg/m3查表1，此值影响较大曝气管距池顶高度管内空气质量流量1140kg/h此值即为G值曝气孔（头）阻力损失阻力系数1.01查表2预留水头损失干管沿程阻力1694Pa风机压力支管沿程阻力1034Pa风机风量小支管沿程阻力4336Pa总沿程阻力7063Pa表1空气密度表风机选型风管搅拌计算局部阻力计算沿程阻力计算表2阻力系数表（根据计算得到的G值查取）数量单位备注圆形或矩形弯头ξ=0.5带导流叶片圆形或矩形弯头ξ=0.30.5T形合流三通ξ=0.34个T形分流三通ξ=0.356个Y形分流、合流三通ξ=0.22175.69Pa矩形渐扩管（对应小断面动压）ξ=0.281991.90Pa矩形渐缩管（对应小断面动压）ξ=0.110.4圆形渐扩管（对应小断面动压）ξ=0.41个圆形渐缩管（对应小断面动压）ξ=0.111个突然缩小（对应小断面动压）ξ=0.50个突然扩大（对应小断面动压）ξ=1.0435.14Pa多叶调节阀ξ=0.52265.59Pa蝶阀/闸阀ξ=0.50.00Pa截止阀ξ=1.60.35伞形罩ξ=0.41个风机出口ξ=0.72个侧面送风口ξ=2.04380.74Pa带过滤网直风管ξ=1.0464.78Pa丝网封堵进风口ξ=2.40.5丝网封堵排风口ξ=1.02个防雨百叶进风口ξ=0.51个防雨百叶排风口ξ=0.50个1087.84Pa331.98Pa0.00Pa7134Pa4m1m水柱=10kPa2000Pa1kPa=0.1m水柱2000Pa1个大气压=10米水柱58.20kPa表压10.0m3/min表1空气密度表风机选型风管水力计算局阻系数估算风管搅拌计算局部阻力计算表2阻力系数表（根据计算得到的G值查取）1015202530451.250.010.020.030.040.050.061.500.020.030.050.080.110.131.750.030.050.070.110.150.202.000.040.060.100.150.210.272.250.050.080.130.190.270.342.500.060.100.150.230.320.40A1/A00.00.10.20.30.40.50.60.70.80.91.0ξ0.500.470.420.380.340.300.250.200.150.090.00A0/A10.00.10.20.30.40.50.60.70.80.91.0ξ1.000.810.640.490.360.250.160.090.040.010.000.220.270.310.360.400.310.390.450.510.570.430.530.610.700.770.560.690.800.911.010.10.20.30.40.50.81.31.41.41.4-1.40.91.31.41.4-9.50.20.91.21.3-21.2-2.50.31.01.20.300.200.300.400.1-0.1-0.8-2.60.10.20.01-0.60.20.30.30.20.20.30.40.410203040901201500.140.070.040.050.110.200.300.250.130.100.120.190.270.370.250.400.500.500.500.50901201501800.756圆（方）弯管r/d\α30605伞形罩α圆形矩形L2/L0ξ10.10.20.40.64侧孔吸风A2/A1L2/L0ξ00.10.20.40.61.251.501.752.00A2/A1A1/A0\α10.0015.0020.0025.0030.002突然收缩与突然扩大3减缩管序号名称图形局部阻力系数ξ1圆形渐扩管A1/A0α0.130.200.250.290.330.350.100.160.200.230.260.280.080.130.170.200.230.250.080.110.150.170.190.210.050.090.120.150.150.170.030.060.070.090.100.110.250.500.801.001.251.501.752.002.503.003.501.801.501.171.000.800.700.570.480.400.370.331.502.002.503.003.504.000.080.090.100.100.110.110.100.110.120.130.110.150.120.140.150.160.170.180.150.180.210.230.250.260.180.250.300.330.350.350.210.310.380.410.430.44ξAξBξAξBξAξBξAξBξAξB0.800.350.750.300.650.300.600.350.550.400.550.250.450.200.400.180.400.250.400.300.350.200.300.160.220.150.220.220.250.300.300.150.200.150.200.130.200.200.250.300.150.120.130.080.130.120.150.150.200.250.100.100.100.050.100.100.130.100.150.250.600.801.001.201.401.600000001.000.400.200.100.050.000.600.801.001.201.401.600.400.350.200.100.000.00-1.80-0.700.000.100.250.350.200.400.600.801.001.201.401.601.802.000.200.402.103.705.206.607.809.0011.0011.0012.000.30-0.210.541.201.802.302.703.103.703.704.000.40-0.330.210.620.961.201.501.702.002.002.100.50-0.380.050.370.600.790.931.101.201.201.300.60-0.41-0.020.230.420.550.660.730.800.850.880.80-0.44-0.100.110.240.330.390.430.460.470.481.00-0.46-0.140.050.160.230.270.290.300.300.2912吸气三通干管ξ1A2/A3L2/L111吸入四通V2/V1干管ξ1支管ξ210压出四通V2/V1干管ξ1支管ξ24560901200.050.1035.009喇叭形吸气口Vd\ξ\α300.200.300.601.008通风机出口变径管α0A0/A110.0015.0020.0025.0030.006.007矩形弯管ξ=ξ'A(ξ'-圆、方弯管的ξ值，见上表）a/bA1.006圆（方）弯管1.251.502.003.000.40.60.81.020.040.060.090.0120.020.040.060.090.0120.018矩形断面直角弯头（一片大型叶片）0.5616矩形断面直角弯头（小型叶片）0.3517矩形断面直角弯头（小型机翼型叶片）0.1015风管入口（装设矩形排风罩）θ0.130.080.120.190.2714风管入口（装设圆形排风罩）θ0.020.030.050.110.2013风管入口（装设孔板）A1/A29.613.081.170.481水槽尺寸1水槽尺寸直径2.29m设定长L8m高H2.54m设定宽W2.3m高H3m2槽表面空气搅拌负荷1.13m3/m2·min此值应小于12槽表面空气搅拌负荷0.42m3/m2·min计算空气量4.65m3/min计算空气量7.73m3/min安全系数1.2一般1~1.5之间安全系数1.2所需供气量5.58m3/min所需供气量9.27m3/min3主管条件3主管条件管径选择介于111.11mm管径选择介于143.18mm管径选择介于140.54mm管径选择介于181.10mm内径100mm设定内径150mm内径0.1m内径0.15m数量1根设定数量1根长度20m深入水槽内长度长度20m4支管条件4支管条件管径选择介于86.07mm管径选择介于49.60mm管径选择介于108.87mm管径选择介于62.74mm内径80mm内径50mm内径0.08m内径0.05mm数量2根一般间隔1~2m数量10根长度1m设定长度2.5m总长度5m总长度25m5曝气孔5曝气孔曝气孔直径6mm设定曝气孔直径6mm曝气孔直径0.006m曝气孔直径0.006m每根枝管孔量4个一般3~4个/m每根枝管孔量12个总量8个总量120个圆形池搅拌方形池搅拌6主管流速9.61m/s宜大于10m/s6主管流速6.00m/s主管截面积0.00785m2主管截面积0.01767m27支管流速8.11m/s一般5~8m/s7支管流速5.50m/s支管截面积0.00503m2支管截面积0.00196m28压力损失8压力损失主管压力损失21.886mmAg主管压力损失4.969mmAg支管压力损失1.049mmAg支管压力损失2.258mmAg每个孔的流量9.6961L/s每个孔的流量1.0733L/s曝气孔压力损失2797.444mmAg曝气孔压力损失94.348mmAg9压降比122.0大于7为合适9压降比13.1设定设定设定此值应小于1一般1~1.5之间设定设定深入水槽内长度一般间隔1m~2m设定设定一般3~4个/m方形池搅拌宜大于10m/s一般5~8m/s大于7为合适