1025t/h煤粉锅炉多空气分级燃烧技术应用数值模拟  

Numerical Simulation on 1025t/h Pulverized Coal-fired Boiler Appling Multi Staged-air Combustion Technology

作　　者：吕太[1] 路昆 闫晨帅[1] 

机构地区：[1]东北电力大学能源与动力工程学院 [2]华电电力科学研究院

出　　处：《电站系统工程》2014年第3期15-18,共4页Power System Engineering

摘　　要：某电厂采用多空气分级燃烧技术对1025 t/h四角切圆燃烧煤粉锅炉燃烧系统进行了防结焦低NOx燃烧改造。运用计算流体力学FLUENT软件,对改造前后额定工况下炉内的温度分布、组分分布、NOx浓度分布、壁面热负荷分布以及颗粒轨迹进行了数值计算与分析,并与对应工况下的试验结果进行对比,计算值与试验值吻合较好,验证了数值计算的准确性。计算及试验结果表明:采用多空气分级燃烧技术有效控制了炉内结焦和高温腐蚀等问题,NOx排放浓度相对于改造前降低40%左右。A 1025t/h tangentially pulverized coal-fired boiler in a power plant was modified by adopting multi staged-air combustion technique for preventing from slagging and reducing NOx levels. Using FLUENT software, a numerical simulation was carried out for simulating temperature distribution, component distribution, NOx levels distribution, wall flux distribution and particle trajectories under rated condition of before and after modification. The calculated values were compared with the experimental values of the corresponding conditions, and they agreed well with each other, which verified the accuracy of numerical calculation. The results from calculation and experiment showed that slag and high-temperature corrosion in furnace could be effectively controlled by adopting multi staged-air combustion technique, and NOx emission levels reduced about 40%, distribution non-uniformity of velocity and temperature at furnace outlet also was lower, relative to that of the former modification.

关 键 词：四角切圆 多空气分级燃烧 结焦 NOx 数值模拟 

分 类 号：TK224.11[动力工程及工程热物理—动力机械及工程]