增压富氧燃烧烟气辐射特性宽带关联k模型  

A Wide Band Correlated-k Distribution Model for the Gas Radiative Property Under Pressurized Oxygen-enriched Combustion

作　　者：米翠丽[1] 阎维平[1] 

机构地区：[1]教育部电站设备状态监测与控制重点实验室(华北电力大学),河北省保定市071003

出　　处：《中国电机工程学报》2010年第29期62-68,共7页Proceedings of the CSEE

基　　金：国家863高技术基金项目(2009AA05Z310)~~

摘　　要：针对增压富氧燃烧方式下烟气中高浓度H2O和CO2混合气体的辐射换热问题,以改进的宽带关联k分布模型为基础,建立了CO2气体4.3μm多谱带合并带的分段处理模型,并与逐线计算和简化模型的计算结果进行对比,结果表明,随着压力的增大,该分段模型与逐线计算结果吻合较好,与简化模型相比,计算精度大大提高。针对电站燃煤锅炉采用富氧燃烧方式炉内H2O和CO2的生成状况,基于以上模型计算得出不同压力下H2O和CO2各谱带的吸收系数,并计算了不同温度和压力下混合气体的辐射强度和发射率,结果显示:在相同的压力下,混合气体的辐射强度和发射率随着温度的升高而升高;当压力由0.1MPa逐渐升至1.5MPa时,辐射强度和发射率逐渐增大,但二者的相对变化却逐渐减小。Based on the improved wide-band correlated-k distribution model,a sectional treatment model of CO2 4.3 μm multiple band was developed to calculate the radiative properties of water vapor and carbon dioxide gas mixtures under pressurized oxygen-enriched combustion mode.The calculation result was compared with line-by-line calculation and simplified model.It is shown that the results obtained by the sectional treatment model are in agreement with those obtained by using line-by-line calculation method with the increasing of pressure.And the comparison with simplified model indicates that the sectional treatment model is more accurate.According to the water vapor and carbon dioxide gas mixtures in the furnace of the coal-fired boiler under pressurized oxygen-enriched combustion mode,the absorption coefficients of each bands under different pressures were calculated.The predicted radiation intensity and emissivity of the gas mixtures under different temperature and pressure were obtained.The results show that the radiation intensity and emissivity of the gas mixtures increase with the rising of temperature at the same pressure.When the pressure is raised to 1.5 MPa from 0.1 MPa gradually,the radiation intensity and emissivity of the gas mixtures increase correspondingly.However,the relative change of the radiation intensity and emissivity decreases with the rising of pressure.

关 键 词：增压富氧燃烧 气体辐射 宽带关联k分布模型 累积分布函数 多谱带 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]