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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.
In order to calculate the physical property and convection heat transfer coefficient of flue gas generated by pressurized oxy-fuel combustion, the three-parameter Villi equation based on real gas was used to calculate the flue gas generated by pressurized oxygen combustion Gas, the heat capacity of the flue gas is obtained by the residual heat capacity, and the kinetic viscosity and thermal conductivity of the flue gas are solved by the method of Chung et al. The results show that under supercritical pressure (6.0 MPa ) Flue gas density increased about 60 times, constant pressure heat capacity, dynamic viscosity, thermal conductivity changes and Prandtl little change; the same flue gas flow rate, the flue gas convection heat transfer coefficient increased More than ten times.