简介:摘要本文从CFB(循环流化床锅炉)锅炉的主要技术特点、结构和系统布置、在节能上等方面进行分析,致力于提高锅炉的可用率,降低锅炉飞灰含碳量,提高锅炉效率。
简介:摘要: 大型循环流化床机组越来越多的参与到电网调峰,对于锅炉的燃烧调整提出了更加严格和精细的要求,如何在锅炉连续大范围负荷波动的情况下保证锅炉的安全运行和较好的经济性是锅炉调整的主要目标,对于循环流化床锅炉的料层控制、风量配比等参数的调整尤其重要。
简介:摘要锅炉排烟温度高,影响锅炉带负荷的能力,同时增加了热量损失,大大降低了锅炉的效率,既不节能,又不环保。本文通过对某电厂排烟温度升高的原因进行分析,并提出排烟温度升高的应对措施,为火电机组降低排烟温度提供参考。
简介:Acombustionmodelofalarge-scalesupercriticalcirculatingfluidizedbed(CFB)boilerwasdevelopedforcomprehensivecomputational-fluid-dynamicsanalysis.Themodelincorporatesgas-solidhydrodynamics,coalcombustion,heattransferonheatexchangesurfacesinthefurnace,andheattransferbetweenfumaceandworkingmediumintheheattransfertubes.Insimulatingthedenseanddilutephasesinthefumace,thegas-solidhydrodynamicsisbasedontheEuler-Eulermodelandenergy-minimizationmultiscaledragmodel.Coalcombustionentailsevaporation,devolatilization,charcombustion,gashomogeneousreaction,andpollutantemission.Thecoefficientofheattransferbetweengas-solidandthewaterwallisestimatedusingtheclusterrenewalmodel,andforradiation,thediscreteordinatemodelisused.Moreover,thermohydraulicprocessesinthemembranewallarealsoineludedintheheattransferprocess.Themodelwassuccessfullyappliedinsimulationsofa350-MWsupercriticalCFBboiler.Detaileddistributionsofsolidsconcentration,oxygen,heatflux,andworkingmediumtemperatureintheboilerfurnacearepresented.