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1、锅炉与锅炉房设备习题答案第 3 章1、解:由过热蒸汽 P=1.37Mpa,t=350,查附表 4-3 得 iq=3151.3kJ/kg由给水温度 t=50,查附表 4-4 得 igs=209.4kJ/kg假设加装省煤器前后锅炉均为额定出力,且 q3、q4、q5和 q6不变,则:gl+q2=gl+q2gl=gl+q2q2(1)假设ir、Qzq、Qwl均为零,且不考虑排污,则:Qgl/BD(iqigs)103/BQ1gl=q1=100%=QrQrQr=4(3151.3209.4)10/950=65.74%(2)188413由(1)、(2)及q2=15%,q2=8.5%可得:gl=gl+q2q2=6
2、5.74%+15%8.5%=72.24%(3)由(2)和(3)可得:B=D(iqigs)103glQr4(3151.3209.4)103=86572.24%18841节煤量B=950-865=85(kg)2、解:由饱和蒸汽绝对压力P=0.93MPa,查附表4-2得iq=2773.3kJ/kg由给水温度t=45,查附表4-4得igs=188.4kJ/kggl=D(iqigs)103/BQr7.533(2773.3188.4)10/(1325/3.5)=3.5=68.13%21562=Dzy(iqigs)103+29300NzybBQnet,ar100%0.2235(2773.3188.4)103
3、+293080.1973.5=3.5=2.70%1325215623.5j=gl=68.13%2.7%=65.43%第 1 页 共 4 页锅炉与锅炉房设备习题答案3、解:假设 ir、Qzq、Qwl均为零,则 Qr=Qnet,arhz-lm=Ghz-lm100Chzlm10017.6=64.08%=213BAar154417.74fh=1hz-lm=35.92%q4=fhCfhC32866AarhzChz(+lmlm+)100%100Qr100Chz100-Chz100-Chz3286617.740.640817.60.359250.2(+)=11.39%1002553910017.610050
4、.24、解:=2.35Har0.126Oar3.720.12610.38=2.35=0.1015Car+0.375Sar55.5+0.3750.99RO2RO2CO=q3=(21-)(+O20.605+)=(210.101511.4)(11.4+8.3)=0.200.605+0.1015235.9 Car+0.375Sar(1q4)CO100%QrRO2+CO235.955.5+0.3750.99(10.0978)0.20=0.96%2135311.4+0.205、解:(1)理论空气量0Vk=0.0889(Car+0.375Sar)+0.265Har0.0333Oar3=0.0889(59.6
5、+0.3750.5)+0.26520.03330.8=5.82m/kg(2)理论烟气量00Vy0=VRO2+VN+VH2O2=0.01866(Car+0.375Sar)+0.79Vk0+0.008Nar+0.111Har+0.0124Mar+0.0161Vk0+1.24Gwh=0.01866(59.6+0.3750.5)+(0.795.82+0.0080.8)+(0.1112+0.012410+0.01615.82)3=1.116+4.604+0.4406.16m/kg(3)160排烟的焓0000Iy=I0+(1)I=V(c)+V(c)+V(c)+(1)VyRO2k(c)kRO2N2H2OKN
6、2H2O=1.116282.2+4.604208.0+0.440242.8+(1.651)5.82212.4=2183()()q2I=pypyVk0(c)lk(1-q4)Qr100%=(21831.655.8224.3)(10.07)=8.17%22190第 2 页 共 4 页锅炉与锅炉房设备习题答案6、解:7、解:第 3 页 共 4 页锅炉与锅炉房设备习题答案8、解:2.91033600pj=81.29%1791BQr2151239、解:锅炉蒸发量为 20t/h由附表 4-2 可得:iq=iqQgl1970.74.5rw=2785.4=2697100100由给水温度 t=55,查附表 4-4 得 igs=231kJ/kg查附表 4-2 可得排污水焓 ips=814.7kJ/kggl=QglBQnet,arB=QglglQnet,ar3=D(iqigs)103+Dps(iqigs)103glQnet,ar320(2697231)10+200.06(814.7231)101284.890.9341860B=1284.893=3854.67,B”=3854.6724365=33766.91第 4 页 共 4 页