Experimental Study on Preheated Combustion of Pulverized Semi-coke  

作　　者：YAO Yao ZHU Jianguo LU Qinggang ZHOU Zuxu 

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

出　　处：《Journal of Thermal Science》2015年第4期370-377,共8页热科学学报（英文版）

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA07030100)

摘　　要：In a test rig,pulverized semi-coke was preheated to 850℃in a circulating fluidized bed(CFB)and then cornbusted at 1100℃in a down-fired combustor(DFC).Experiments were conducted to reveal the effects of three secondary air nozzle cases(co-axial jet,top circular jet and wall circular jet)on the NO emission.The results show that the optimized secondary air nozzle can reduce NO emission.O_2 concentration profile is the major factor affecting NO generation and emission,which is led by the secondary air nozzle.The lower O_2 concentration led to the generation of lower initial NO.The NO emission at the exit of the DFC was reduced from 189 to 92mg/m^3(@6%O_2)with the decrease of initial generation.The peak of NO at 100 mm below the nozzle should be attributed to the oxidization of NH_3 in the syngas,rather than the oxidization of fuel-N in the char.The low and well-distributed O_2 concentration contributes to the reduction of initial NO,which helps to reduce the NO emission.The combustion effieiencies of the eases of the co-axial jet,the top circular jet,and the wall circular jet are97.88%,98.94%and 98.74%,respectively.

关 键 词：Pulverized semi-coke Preheated combustion Secondary air nozzle NO emission. 

分 类 号：TQ534[化学工程—煤化学工程]