余热锅炉热力计算.doc

热力计算书、余热锅炉设计参数1锅炉蒸发量DKg/h给定330.02额定工作压力PMpa给定0.503饱和温度tbh°C查表158.94给水温度tgs°C设计205冷空气温度tlkC设计30、设计用代表性天然气成分分析《锅炉计算手册》表5-111甲烷CH4%95.02乙烷CH26%2.43氢气H2%1.04一氧化碳CO%0.15-氧化碳CO2%0.56氮气N2%1.07燃料低发热值QkJ/Nm335588^三、燃烧产物计算(1)理论1理论空气量VoNm3/Nm3(0.5H^.5CO+2CH+3.5CH)/2124269.4742氮气理论容积V0N2Nm3/Nm30・79V0+0・01N27.4943三原子气体容积VR02Nm3/Nm30.01(CO+CO+2CH+CH)22641.0044水蒸气理论容积V0H2ONm3/Nm30・01(H,+3C,H6+2CH4)+0-0161V02.135(2)燃烧1过剩空气系数a选取1.22实际水蒸气容积VH2ONm3/Nm3V°+0・0161(a-1)V02.1653实际氮气容积VN2Nm3/Nm30.79aV°+0・01N28.994过量氧气容积VO2Nm3/Nm30.21(a-1)V00.405烟气容积VyNm3/Nm3V+V+V+VR02N2H2OO212.566RO2容积份额Y"RO2V/VR02y0.0807H2O容积份额YH2OV/VH2Oy0.1728三原子气体总容积份额Y丫+YRO2H2O0.252附AINm3气体的焓(KJ/Nm3)vv锅炉计算手册〉〉表2-21(°C)(C9)CO2(C9)(C9)(C9)K\7100170130H5O1322003572603042663005593924634034007725276265425009946647956846001225804969830700146294811499788001705109413341129900195212421526128210002204139217231437110024581544192515951200271716972132175313002977185323441914140032392009255920761500350321662779223916003769232530022403170040362484322925671800430526443458273119004574280436902899200048442965392630662100511531274163323422005387328944023402230056593452464435712400593036154887374025006203377951323910四、A温焓表iy(°C)IR02I0N2I0H2O10K1.2\7100170.68974.26322.311250.541717.36200358.431948.52648.902520.033459.85300561.242937.77988.293817.955250.88400775.093949.501336.215134.807087.76500997.984976.221696.956480.098967.166001229.906025.422068.367863.2610896.347001467.857104.612452.579265.3912878.108001711.828198.772847.4610695.9314897.249001959.819307.933257.2912145.4216954.1210002212.8210432.083677.7913613.8619045.4611002467.8311571.214108.9715110.7321170.1612002727.8712717.844550.8116607.5923318.0413002988.9113886.965003.3318132.8725505.7714003251.9615056.075462.2619667.6327703.8115003517.0116232.675931.8521211.8629923.9116003784.0817424.276407.8522765.5632169.3117004052.1418615.866892.3924319.2734424.2518004322.2219814.957381.2025872.9736692.9719004592.3021014.047876.4127464.5738975.6620004863.3822220.638380.1629046.7041273.5021005135.4623434.718886.0430638.3043583.8722005408.5524648.789396.1932229.9045899.5123005681.6425870.369912.7533830.9748230.9424005953.7227091.9310431.435432.0550563.5025006227.8128321.0010954.437042.6052911.73五、余热锅炉热平衡计算1锅炉额定烝发量DKg/S0.0922给水焓igsKJ/Kg84.003饱和蒸汽焓1“KJ/Kg2756.724锅炉有效吸热量QyxKJ/S245.005散热损失q%《锅炉计算手册》表7-43.006锅炉热效率n%100-q97.00六、锅炉结构特性计算（一烟管的计算1烟管外径Dwmm设计322烟管壁厚Smm设计33烟管内径DnmmD-2Sw264烟管长度Lmm设计20005烟管数量n根设计1456对流受热面积Hdlm2nnDnL23.6887烟气流通截面积Fym2nnDn2/40.0778螺纹节距Pmm设计369螺纹深度emm设计2.5七烟管热力计算1排烟量VpyNm3/h16002进口烟气温度9'°C炉胆出口烟温600.03进口烟焓1‘KJ/Nm3查温焓表10896.344出口烟气温度9“C取排烟温度1905出口烟焓1”KJ/Nm3查温焓表3285.606烟气热平衡放热量QrpKJ/SVpy/Vy*(1‘)/3600269.357烟气平均温度9pjC(9'+9")/2395.008大温压AtdC9'-tbh441.19小温压AtxC9“-tbh31.1410传热平均温压AtC(At-At)/ln(Atd/Atx)dx154.6711烟气流速Wym/sVy(9+273)/(273F)/360014.1312平均成分烟气动粘性系数Vrm2/s《锅炉计算手册》表2-46(300~400)59.7E-613平均成分烟气导热系数入rKJ/(msC)《锅炉计算手册》表2-46(300~400)65.6E-614平均成分烟气Pr值Prr--《锅炉计算手册》表2-46(300~400)0.64115系数MV《锅炉原理》图1151.00516系数M入《锅炉原理》图1151.00517系数mdPr《锅炉原理》图1151.0118烟气动粘性系数Vm2/sMVvr59.9E-619烟气导热系数入KJ/(ms°C)M入入r65.9E-620烟气Pr值PrMPprrr0.6521雷诺数ReWD/vyn6126.5022对流放热系数adKW/(m2°C)0.0144入/dReo.9206(p/d)0.08(£/d)0.1120.083923灰壁温度ThbCt+At+273取At=60s491.8624有效辐射层厚度———>Z_-/r上一-石»、」、.—r—iSm0.9Dn0.023425二原子气体辐射减弱系数Kq1/(m.MPa)102.6926烟气黑度ay1eKq.rq.P.s0.059。