增压富氧燃烧烟气物性及对流传热系数的研究  

Physical Properties and Convective Heat-transfer Coefficients of Flue Gas from Pressurized Oxy-fuel Combustion

作　　者：马凯[1] 阎维平[1] 高正阳[1] 

机构地区：[1]华北电力大学电站设备状态监测与控制重点实验室,保定071003

出　　处：《动力工程学报》2011年第11期861-868,共8页Journal of Chinese Society of Power Engineering

基　　金：国家高技术研究发展863计划专项经费资助项目(2009AA05Z310)

摘　　要：增压富氧燃烧产生的烟气不能作为理想气体处理,为了计算增压富氧燃烧产生烟气的物性和对流传热系数,采用基于实际气体的三参数维里方程计算了增压条件下烟气的密度,通过剩余热容求解烟气的定压热容,并采用Chung等的方法解得烟气的动力黏度和导热系数.结果表明:与常压条件下相比,增压(6.0 MPa)下的烟气密度增大了约60倍,定压热容、动力黏度、导热系数变化及普朗特数变化不大;在相同的烟气流速下,烟气侧的对流传热系数提高了十几倍.Flue gas from pressurized oxy-fuel combustion can not be treated as ideal gas.In order to calculate the physical properties and convective heat-transfer coefficients of the flue gas,the density of pressurized flue gas has been calculated with 3-parameter virial equation based on real gas case,while the specific heat at constant pressure solved with excess heat capacity,and the dynamic viscosity and conductivity obtained by the Chung method.Results show that the density of flue gas from pressurized（6.0MPa） combustion is 60 times more than that from atmospheric combustion,but the specific heat,the dynamic viscosity,the thermal conductivity and the Prandtl number are basically the same at above two combustion modes.At the same flow rate of flue gas,the gas-side heat-transfer coefficient can be raised by more than ten times.

关 键 词：增压富氧 烟气物性 实际气体 对流传热 维里方程 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]