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烟气阻力计算书第1页,共3页序号名称符号单位计算公式2台1T蒸汽锅炉计算结果1(立管用DN350)2台1T蒸汽锅炉计算结果2(立管用DN400)2台2100Kw汽锅炉计算结果(立管用DN600)锅炉功率700Kw700Kw2100Kw燃气发热值Q气kJ/Nm3给定36533.0036533.0036533.00燃气耗量BjNm3/h根据锅炉燃烧计算80.0080.00225.50单台锅炉烟气总量Vy实m3/hVy实=Vy*(Bj)1150.001150.003115.00锅炉烟气总量Vy总m3/h2300.002300.006230.00烟囱垂直高度Hm给定90.0090.0090.00锅炉的排烟温度t1℃170.00170.00170.00室外温度t℃30.0030.0030.00锅炉台数n1台2.002.002.00锅炉总吨位Dt/h2.002.006.00锅炉总吨位求根√D√D1.411.412.45修正系数A钢板0.900.900.90主烟囱内烟气的平均温度t2℃t2=t1-H·A/2/√D141.36141.36153.47支烟囱直径d1m给定0.300.300.50总烟道直径d2m给定0.400.400.70烟囱直径(立管段)d3m给定0.350.400.60单台锅炉烟气量G1m3/s热力计算0.320.320.87总烟气量G总m3/s0.640.641.73系数a燃气(油)锅炉358.00358.00358.00烟囱截面及长度支烟囱截面积S1m2(d1/2)2×3.140.070.070.20烟道截面积(水平段)S2m2(d2/2)2×3.140.1260.1260.385烟囱截面积(垂直段)S3m2(d3/2)2×3.140.0960.1260.283支烟囱长度L1m2.002.002.00总烟道水平段长度L2m给定82.0082.0082.00锅炉烟囱通风阻力计算烟气阻力计算书第2页,共3页总烟道立管段长度L3m给定90.0090.0090.004.烟气流速支烟囱流速v1m/sG1/S14.524.524.41水平段烟囱流速v2m/sG总/S25.095.094.50立管段烟囱流速v2m/sG总/S36.645.096.12摩擦阻力系数λ1钢制烟风道为0.020.020.020.02排烟比重(水平段)γ1kg/m3液体燃料为a/(273+t1)0.810.810.81排烟比重(立管段)γ2kg/m3液体燃料为a/(273+t2)0.860.860.84重力加速度gm/s9.809.809.80支烟囱△P11mmH2Oλ1×(L1/d1)×(v12/2g)×γ10.110.110.06总烟道水平段△P12mmH2Oλ1×(L2/d2)×(v22/2g)×γ14.374.371.96总烟道立管段△P13mmH2Oλ1×(L3/d3)×(v32/2g)×γ210.015.134.82总摩擦力△P1mmH2O14.499.626.84局部阻力蝶阀阻力系数ζ11查系数表0.200.200.20烟道蝶阀阻力△P11mmH2Oζ11×(v12/2g)×γ10.170.170.1690º弯头阻力系数ζ31查系数表1.201.201.20支烟囱每个90º弯头阻力△P31mmH2Oζ31×(v12/2g)×γ11.011.010.96支烟囱90º弯头总数Nw1个1.001.001.00支烟囱90º弯头总阻力△P31总mmH2ONw1×△P311.011.010.96合流系数ζ41查系数表0.560.560.56每处合流阻力△P41mmH2Oζ34×(v22/2g)×γ11.020.600.87合流处数Nw2个1.001.001.00合流总阻力△P41总mmH2ONw2×△P411.020.600.8790º弯头阻力系数ζ32查系数表1.201.201.20总烟道每个90º弯头阻力△P32mmH2Oζ32×(v22/2g)×γ12.181.281.86总烟道90º弯头总数Nw2个8.008.008.00总烟道90º弯头总阻力△P32总mmH2ONw2×△P3217.4710.2414.84总局部阻力△P2mmH2O19.6712.0216.83节能器阻力△P3mmH2O5.005.005.00烟气阻力计算书第3页,共3页总阻力总阻力△PammH2O△P3+△P1+△P239.1626.6428.67通风力计算烟囱抽力(立管段)P01mmH2OH×[353/(273+t)-a/(273+t2)]27.0927.0929.30抽力与阻力比较P1mmH2OP01-△Pa-12.070.460.63化为Pa单位Pa-120.714.556.32说明:拔风力阻力拔风力阻力拔风力阻力1、2台1T蒸汽锅炉,如果垂直段用DN350的烟囱,总阻力大于烟囱拔风力,烟气无法顺利排放。如果垂直段用DN400,可以顺利排烟。建议用DN400。2、2台2100KW热水锅炉,如果垂直段用DN400的烟囱,总阻力小于烟囱拔风力,烟气可以顺利排放。3、本次计算选最远处的一台锅炉,该锅炉能顺利排烟,其他锅炉亦能顺利排烟;4、以上计算数据仅供参考,应以烟囱供应商计算的为准。
本文标题:锅炉烟囱阻力计算
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