Effect of H_(2)O on Preheating Combustion Characteristics in O_(2)/CO_(2)and O_(2)/N_(2)Atmospheres  

作　　者：PAN Fei ZHU Jianguo LIU Jingzhang LIU Yuhua 

机构地区：[1]Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing,100190,China [2]University of Chinese Academy of Sciences,Beijing,100049,China

出　　处：《Journal of Thermal Science》2023年第6期2235-2242,共8页热科学学报（英文版）

基　　金：This study is supported by the National Natural Science Foundation of China(No.51676187).

摘　　要：This study explores the effect of H_(2)O on the characteristics of the oxy-fuel combustion process preheated by a circulating fluidized bed.The preheating and combustion characteristics have been studied in O_(2)/CO_(2)/H_(2)O and O_(2)/N_(2)/H_(2)O atmospheres.It was observed that the preheating temperature decreased with adding steam.Meanwhile,the addition of steam enhanced the C-H_(2)O gasification reaction,while weakened the C-CO_(2)gasification reaction.As a result,the H2 concentration was increased,while the CO concentration was reduced.H_(2)O was conducive towards increasing the surface area and pore formation of the preheated char,though it had an insignificant effect on the particle size.Moreover,H_(2)O enhanced the preheated char activity,which was helpful for ignition and stable combustion.The NO_(x)emission was observed to increase from 68 to 79 mg/MJ and 62 to 81 mg/MJ in O_(2)/CO_(2)and O_(2)/N_(2)atmospheres,respectively,after adding steam.

关 键 词：circulating fluidized bed OXY-FUEL H_(2)O structure characteristics NO_(x)emission 

分 类 号：TK16[动力工程及工程热物理—热能工程]