Industrial-scale investigations on effects of tertiary-air declination angle on combustion and steam temperature characteristics in a 350-MW supercritical down-fired boiler

作     者：Xiaoguang LI Lingyan ZENG Hongye LIU Yao LI Yifu LI Yunlong ZHAO Bo JIAO Minhang SONG Shaofeng ZHANG Zhichao CHEN Zhengqi LI Xiaoguang LI;Lingyan ZENG;Hongye LIU;Yao LI;Yifu LI;Yunlong ZHAO;Bo JIAO;Minhang SONG;Shaofeng ZHANG;Zhichao CHEN;Zhengqi LI

作者机构：School of Energy Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Guizhou Wanfeng Electric Power Co.Ltd.Xingyi 562400China Guizhou Xingyi Project DepartmentHuadian United(Beijing)Power Engineering Co.Ltd.Xingyi 562400China 

出 版 物：《Frontiers in Energy》 (能源前沿（英文版）)

年 卷 期：2021年第15卷第1期

页      面：132-142页

核心收录：

学科分类：080703[工学-动力机械及工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.51706054) the China Postdoctoral Science Foundation(Grant No.2019M660633) 

主　　题：supercritical down-fired boiler industrialscale experiment tertiary air declination angle coal combustion steamtemperature 

摘      要：Industrial-scale experiments were conducted to study the effects of tertiary air declination angle(TDA)on the coal combustion and steam temperature characteristics in the first 350-MW supercritical down-fired boiler in China with the multiple-injection and multiple-staging combustion(MIMSC)technology at medium and high *** experimental results indicated that as the TDA increased from 0°to 15°,the overall gas temperature in the lower furnace rose and the symmetry of temperature field was *** ignition distance of the fuel-rich coal/air flow *** near-burner region,the concentration of O2 decreased while the concentrations of CO and NO *** concentration of NO decreased in near-tertiary-air *** carbon in fly ash decreased significantly from 8.40%to 6.45%at a load of 260 *** a TDA of 15°,the ignition distances were the shortest(2.07 m and 1.73 m)at a load of 210 MW and 260 MW,*** main and reheat steam temperatures were the highest(557.2℃ and 559.4℃ at a load of 210 MW,558.4℃ and 560.3℃ at a load of 260 MW).The carbon in fly ash was the lowest(4.83%)at a load of 210 *** changing the TDA from 15°to 25°,the flame kernel was found to move downward and the main and reheat steam temperatures dropped *** change of TDA has little effect on NO_(x) emissions(660–681 mg/m^(3) at 6%O_(2)).In comprehensive consideration of the pulverized coal combustion characteristics and the unit economic performance,an optimal TDA of 15°is recommended.