烟气温度对反演的当量灰吸收系数影响的研究

Effect of Gas Temperature on Equivalent Gray Absorption Coefficient Obtained Using Inverse Analysis

当量灰吸收系数是考虑了许多影响因素的综合参数,其中,烟气温度对当量灰吸收系数的影响最大.以实验数据为基础,采用区域法与求目标函数最小值的共轭梯度法相结合的方法反演计算了不同烟气温度下的当量灰吸收系数.结果表明,总体上当量灰吸收系数随烟气温度的升高而减小,不同烟气温度范围内,变化趋势不同.温度较高时,变化较平缓,而温度较低时,变化趋势较大.

Equivalent gray absorption coefficient is effected by many factors, among which gas temperature distribution is the most important one. Based on experiment data, equivalent gray absorption coefficients at various gas temperature distributions are calculated using inverse analysis, which combines the zone method and the minimization of a performance function stylizing the conjugated gradient method. Results show that, generally speaking, equivalent gray ons decrease with the increase of gas temperatures, but the variance tendencies differ at different temperature ranges. Equivalent gray absorption coefficients vary more strongly in the ranges of high temperature, while more smoothly at lower temperature range. The method presented in this paper can be used to calculate equivalent gray absorption coefficient at various gas temperature, when there is a lake of experimental data.