某炉子的烟道系统如图133所示并已知:烟气温度t819...

某炉子的烟道系统如图133所示并已知:烟气温度t819... *习 1—5 1、某炉子的烟道系统如图1—33所示。并已知：烟气温度t=819?，烟气密度 33ρ=1.3kg/m，烟气的流量V=7200m/h，分烟道断面尺寸为0.6×0.6m，总烟道断O0 面尺寸为0.72×1.0m。试求烟气由I面流经砖砌烟道至?面时的总压头损失为多 少？设周围空气为30?，烟气在垂直支分烟道中每米之温降为4.6?/m，烟气在水平总烟道中每米之温降为4?/m。 7200 V203600,,,,,2.78m/s ,F0.72，1.00.72 2ω2.78，2.780,,，1.3,5.02 022 F0.6，0.61,,0.5 F0.72，12 4，0.6，0.6D,,0.6 12，(0.6，0.6) 4，0.72，1.0D,,0.84 22，(0.72，1.0) 13h 1 819，805.22,L302,,, h,(1，t),0.05，，5.02，(1，)10D20.6273 ,0.05*5*5.05*3.97,5.01Pa 22h 2 805.2，797.22,L202 ,,,h,(1，t),0.05，，5.02，(1，)20D20.6273 ,0.05*3.33*5.02*3.93,3.286Pa 0390h 3 2ω0h,K,(1，,t) 3102 F? 2,1 ?K=1.2 1F1 2ω805.20h,K,(1,，t),1.2*5.02*(1，),23.97Pa 31022734h 5 ,h,Hg(,,,) 4 H=3m ,,1.20, ,,,1.08,301，t,1，273 ,1.30,,,,0.33 819，805.21，t, 21， 273 ,h,Hg,(,,),3，9.8，(1.08,0.33),22.05Pa 4 5h: 5 2ω797.20h,K(1，t),3*5.02*(1，),,530 2273 ,3*5.02*3.92,59.04Pa 6h 6 797.2，677.22,L3002,,,h,(1，t),0.05，，5.02，(1，)60 D20.84273 ,0.05*35.71*5.05*3.7,33.16Pa +h+h+h+h+h =5.01+3.30+23.97+22.05+59.04+33.16=146.35Pa 123456 7 h=h