摘要
为了提高循环流化床锅炉变工况下传热计算的精度,克服现有的关于炉内平均传热系数模型的不确定性,针对75 t/h循环流化床锅炉,依据在大量变工况试验的基础上所获得的不同负荷下沿炉膛高度的固体物料浓度分布,建立了变工况下分三区计算的传热模型。该传热模型正确反映了炉膛上部过渡区和稀相区平均固体物料浓度随循环流化床锅炉运行主导因素的变化规律。计算结果表明:依据三区传热模型计算的各区温度与试验运行值在各个工况下都吻合较好,该结果为循环流化床锅炉的动态特性研究和仿真研究提供了技术支持。
A ＂three zones＂ heat transfer model was developed to calculate the heat transfer coefficient in a circulating fluidized bed （CFB） boiler. The method improves the heat transfer calculations for various operating modes of a CFB boiler and overcomes the uncertainties of current heat transfer models which focus on average heat transfer coefficients in the furnace. The model is based on solid suspension density profile measured along the furnace height in many hot test measurements in a 75t/h CFB boiler. The core of this model is the correlation between the average solid suspension density and the main operating condition in the transition zone and the dilute zone of the CFB boiler. Temperatures calculated in the three zones for various operating conditions fit well with the measured temperatures for each operating mode. This work provides a basis for analyses of the dynamic properties in CFB boiler simulations,
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第5期704-707,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(50323002)
关键词
循环床锅炉
变工况
传热系数
物料浓度
circulating fluidized bed boiler
operating modes
heat transfer coefficient
solid suspension density
