余热锅炉热力计算

26燃气计算书热力计算书一、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℃查表158.94给水温度tgs℃设计205冷空气温度tlk℃设计30二、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C2H6%2.43氢气H2%1.04一氧化碳CO%0.15二氧化碳CO2%0.56氮气N2%1.07燃料低发热值QkJ/Nm335588三、燃烧产物计算（1）理论空气量及α=1时的燃烧产物计算1理论空气量VONm3/Nm3（0.5H2+0.5CO+2CH4+3.5C2H6）/219.4742氮气理论容积VN20Nm3/Nm30.79V0+0.01N27.4943三原子气体容积VR02Nm3/Nm30.01（CO2+CO+2C2H6+CH4）1.0044水蒸气理论容积VH2O0Nm3/Nm30.01（H2+3C2H6+2CH4）+0.0161V02.135（2）燃烧产物的容积和特性1过剩空气系数α选取1.22实际水蒸气容积VH2ONm3/Nm3VH2O0+0.0161(α-1)V02.1653实际氮气容积VN2Nm3/Nm30.79αV0+0.01N28.994过量氧气容积VO2Nm3/Nm30.21（α-1）V00.405烟气容积VyNm3/Nm3VR02+VN2+VH2O+VO212.566RO2容积份额γRO2VR02/Vy0.0807H2O容积份额γH2OVH2O/Vy0.1728三原子气体总容积份额γγRO2+γH2O0.25226燃气计算书附1Nm3气体的焓(KJ/Nm3)锅炉计算手册表2-21θ(℃)（Cθ）CO2（Cθ）N2（Cθ）H2O（Cθ）K100170130151132200357260304266300559392463403400772527626542500994664795684600122580496983070014629481149978800170510941334112990019521242152612821000220413921723143711002458154419251595120027171697213217531300297718532344191414003239200925592076150035032166277922391600376923253002240317004036248432292567180043052644345827311900457428043690289920004844296539263066210051153127416332342200538732894402340223005659345246443571240059303615488737402500620337795132391026燃气计算书四、温焓表Iyθ(℃)IRO2IN20IH2O0IK01.2100170.68974.26322.311250.541717.36200358.431948.52648.902520.033459.85300561.242937.77988.293817.955250.88400775.093949.501336.215134.807087.76500997.984976.221696.956480.098967.166001229.906025.422068.367863.2610896.347001467.857104.612452.579265.3912878.108001711.828198.772847.4610695.9314897.249001959.819307.933257.2912145.4216954.1210002212.8210432.083677.7913613.8619045.4611002467.8311571.214108.9715110.7321170.1612002727.8712717.844550.8116607.5923318.0413002988.9113886.965003.3318132.8725505.7714003251.9615056.075462.2619667.6327703.8115003517.0116232.675931.8521211.8629923.9116003784.0817424.276407.8522765.5632169.3117004052.1418615.866892.3924319.2734424.2518004322.2219814.957381.2025872.9736692.9719004592.3021014.047876.4127464.5738975.6620004863.3822220.638380.1629046.7041273.5021005135.4623434.718886.0430638.3043583.8722005408.5524648.789396.1932229.9045899.5123005681.6425870.369912.7533830.9748230.9424005953.7227091.9310431.435432.0550563.5025006227.8128321.0010954.437042.6052911.7326燃气计算书五、余热锅炉热平衡计算1锅炉额定蒸发量DKg/S0.0922给水焓igsKJ/Kg84.003饱和蒸汽焓I“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η%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DnmmDw-2S264烟管长度Lmm设计20005烟管数量n根设计1456对流受热面积Hdlm2nπDnL23.6887烟气流通截面积Fym2nπDn2/40.0778螺纹节距Pmm设计369螺纹深度εmm设计2.526燃气计算书七烟管热力计算1排烟量VpyNm3/h16002进口烟气温度θ’℃炉胆出口烟温600.03进口烟焓I‘KJ/Nm3查温焓表10896.344出口烟气温度θ“℃取排烟温度1905出口烟焓I”KJ/Nm3查温焓表3285.606烟气热平衡放热量QrpKJ/SVpy/Vy*（I‘-I）/3600269.357烟气平均温度θpj℃(θ’+θ)/2395.008大温压Δtd℃θ’-tbh441.19小温压Δtx℃θ“-tbh31.1410传热平均温压Δt℃(Δtd-Δtx)/ln(Δtd/Δtx)154.6711烟气流速Wym/sVy(θpj+273)/(273Fy)/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λrKJ/(ms℃)《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)0.64126燃气计算书15系数Mν--《锅炉原理》图11-51.00516系数Mλ--《锅炉原理》图11-51.00517系数MPr--《锅炉原理》图11-51.0118烟气动粘性系数νm2/sMvVr59.9E-619烟气导热系数λKJ/(ms℃)Mλλr65.9E-620烟气Pr值Pr--MprPrr0.6521雷诺数Re--WyDn/ν6126.5022对流放热系数αdKW/(m2℃)0.0144λ/dRe0.9206（P/d）-0.08（ε/d）0.1120.083923灰壁温度Thb℃ts+Δt+273取Δt=60491.8624有效辐射层厚度Sm0.9Dn0.023425三原子气体辐射减弱系数Kq1/(m.MPa)102.6926烟气黑度ay--1-e-Kq.rq.P.S0.05927辐射放热系数αfKW/(m2℃)0.002528烟气侧放热系数α1KW/(m2℃)αd+αf0.086429热有效系数ψ--《锅炉计算手册》表10-680.8530传热系数KKW/(m2℃)ψ.α10.073431传热量QcrKJ/SKHdlΔt268.9932相对误差ΔQ%100(Qrp-Qcr)/Qrp0.1333允许相对误差[ΔQ]%±2八汽水边与烟气边热平衡计算1热平衡放热量Qrp烟管热力计算269.353锅炉效吸热量QyxKJ/S245.004相对误差ΔQ[ηQrp-Qyx]/Qrp0.065允许误差[ΔQ]±0.526燃气计算书阻力计算书一烟管进口阻力1管子内径dnmm26.002烟气流通截面积Fm2热力计算0.0773进口烟温θ℃热力计算600.004标准状况下烟气密度ρ0kg/m3（1+1.306αV0）/Vy1.2625烟气实际密度ρkg/m3273ρ0/(273+θ)0.3956烟气流速Wm/sVpy(273+θ)/(273F)/360018.467局部阻力系数ξ查表0.858进口阻力△h2PaξρW2/257.16二烟管出口阻力1出口烟温θ℃热力计算190.002烟气实际密度ρkg/m3273ρ0/(273+θ)0.7443烟气流速Wm/sVpy(273+θ)/(273F)/36009.794局部阻力系数ξ查表1.105出口阻力△h3PaξρW2/239.23三烟管沿程阻力1平均烟温θ℃热力计算395.002烟气实际密度ρkg/m3273ρ0/(273+θ)0.5163烟气流速Wm/s热力计算14.134管束长度lmm设计2000.05雷诺数Re——热力计算6126.506阻力系数λ——式3-230.0957沿程阻力△h4Paλ（l/dn）ρW2/2376.5726燃气计算书四烟囱出口阻力1烟囱直径dmm设计350.002烟气流通截面积Fm2πd2/40.0963烟气温度θ℃取排烟温度190.004烟气实际密度ρkg/m3273ρ0/(273+θ)0.7445烟气流速Wm/sVpy(273+θ)/(273F)/36007.836局部阻力系数ξ查表1.107烟囱出口阻力△h8PaξρW2/225.128烟囱出口烟气动压头△h9PaρW2/222.84五鼓风机风压1烟气行程总阻力△h’Pa∑△hi520.922流量备用系数β1.103鼓风机风压△hPaβ△h’573.01