论文部分内容阅读
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 power plant using multi-air staged combustion technology for 1025 t / h tangentially fired pulverized coal fired boilers combustion system anti-coking combustion low NOx. The temperature distribution, component distribution, NOx concentration distribution, wall heat load distribution and particle trajectory were calculated and analyzed with the help of FLUENT software before and after retrofitting, and compared with the experiment under the corresponding working conditions The results are compared, the calculated value is in good agreement with the experimental value, which verifies the accuracy of the numerical calculation. The calculation and test results show that the multi-atmosphere staged combustion technology can effectively control the problems of coking and high temperature corrosion in the furnace, and the NOx emission concentration is reduced by about 40% compared with that before the reform.