风冷干排渣系统对锅炉效率影响分析计算(1)

第31卷第1期2010年3月电站辅机PowerStationAuxiliaryEquipmentVol.31No.1Mar.2010:16720210(2010)01003404范仁东(江苏省电力设计院,江苏南京211102):结合国内干式排渣系统的实际运行情况,从热平衡计算的角度着手,定量分析了运行干式排渣系统对锅炉效率的影响事实上,对于排渣量较小的锅炉,干式排渣机运行时本体的漏风现象非常严重,以简化后的热平衡模型对效率进行估算,可知运行现有的干式排渣系统,会使锅炉效率降低0.34个百分点,或更多目前,对部分电厂的实测数据也证明了这一点:风冷;干式;排渣系统;锅炉;效率;热平衡;分析;计算:TK227.3:AAnalysis&CalculationofBoilerEfficiencyinfluencedbyAircooledSlagFlowSystemFANRendong(JiangsuProvincialElectricPowerDesignInstitute,Nanjing,Jiangsu,211102,China)Abstract:Combinedwiththeactualoperationofthedomesticaircooledslagflowsystem,aquantitativeanalysisontheaircooledslagflowsystemhasbeenmadewiththeinfluenceontheboilerstartingincalculationofheatbalance.Actually,airleakageisalwaysseriouslywiththeaircooledslagdeviceagainsttheboilerwithsmallslagflow.Theevaluationoftheefficiencyismadewithasimpleheatbalancemodel,whichshowsthattheexistingaircooledslagflowsystemwouldreducetheboilerefficiencyatleast0.34%ormorewhichhasbeenverifiedwithactualdatafrompartofpowerplants.Keywords:aircooled;dry;slagflowsystem;boiler;efficiency;heatbalance;analysis;calculation:20091119:20100209:(1962),,,12080,2350MW,199912,,,,2007,50,100,50GW20017,(),,1000GW,30,50,10GW,1%,,,,,?34风冷干排渣系统对锅炉效率影响分析计算电站辅机总第112期(2010No.1)?,,2,,,,:+=2.1,,1,t11F1,t22F21Qr[1]:Qr=F1C0s273+t11004-273+t21004(W)(1):s=111+F1F212-1F2F1,(1):Qr=F1C01273+t11004-273+t21004(W)(2):C0,C0=5.67W/(m2k4)F1(m2)t1,,,750~800,1,,:(),,,1=1.0t2,,2.2QbQb=GzCz(tz-t0)(W)(3)Gz,(kg/s)Cz,J/(kg)11J/(kg)1002003004005006007008009001000795.5837.4866.7891.8921.1924950.4963979.71004.8,:Cz=749.4+0.5041t-3.984510-4t2+1.339310-7t3Qb=Qztzt0(749.4+0.5041t-3.984510-4t2+1.339310-7t3)dtQb=Gz[749.4(tz-t0)+0.252(t2z-t20)-1.32810-4(t3z-t0)+0.33510-7(t42z-t40)](W)(4)tz,,815t0,2.3Qa:Qa=GaCa(t2-ta)(W)(5):Ga(kg/s)Ca,Ca=995.6+9.310-2t(J/(kg)Qa=Gat2ta(995.6+9.310-2t)dtQa=Ga[995.6(t2-ta)+4.6510-2(t22-t2a)](W)(6)t2,ta,:Qa=Qb+Qr(7)35电站辅机总第112期(2010No.1)(7),Gat233.1(),,,:,250%t0150,,,(340~360)Gz=MCR2.5t0=150t2=340~360,(2)(4)(7),Ga03.2,,,330d,MCR5000h,:Gz=MCR0.63,,;,,,,,,;,,,Ga0,,t050,(2)(4)(7),t20,3.3(),,,340~360,,,,,340~360,t20,,t20QS:QS=Ga0[995.6(t22-t20)+4.6510-2(t222-t220)](W)(8):Ga0,(kg/s)t22,t22=340~360t20,,,1600MW11000MW,22600MW1000MWMW160011000MJ/kg21.321.5MCRt/h254408MCRt/h7.312.0mm22.21.43341.29ta16.016.0Ga0kg/s14.5422.46t20213.5204QSkW20303350%-0.338-0.335t43006830t312050104(1),,,36风冷干排渣系统对锅炉效率影响分析计算电站辅机总第112期(2010No.1)0.34,,,,,,,,,,,,0.34,(2)2080,,,,,,,,,,(3),,,,2080:,,,,,2:Q=AE/1000(m3/h)(9):A(m2)E,E=73.238kg/(m3h)1600MW,Q=2.3t/h;11000MW,Q=3.2t/h,,,,5,,:[1].[M].,1992.[2]A-S-H[S].1987.(上接第29页),,;,,,,,,:[1]IgorJ.Karassik.[M].:,2003.268-358.[2],.[M].:,2003.80-81.[3],.[M].:,2005.151-152.欢迎投稿欢迎订阅37