天然气再燃低NOx技术的冷模试验分析

在一个几何比例为1：12．5的220t／h切向燃烧深粉锅炉冷模试验台上,通过喷入不同温度的气流并测量炉内温度场,模拟了不同喷射方式和喷射流量时的再燃气体、燃烬气流与主气流之间的混合特性。试验结果表明,前后墙方向喷出的再燃气流与主气流之间形成了快速互均匀的混合,但主燃烧区空气动力场变化较大;切向喷出的再燃气流更适合于切圆燃烧深粉锅炉;四角切向喷入燃烬风对燃烬有利。本文还对再燃气流的喷射量、喷射位置对混合效果的影响,进行了讨论。

Cold Model Experimental Study Using Reburning Tecnology to Reduce the emissions of NOx

A cold model (its ratio is 1:12.5) of a 50 MW tangentially pulverized coal-fired boiler was built and the mixture characteristic between a simulating gas (hot air) and a main airflow (cold air) were gotten at different ejecting methods and quantities of the simulating gas through measuring the temperature pattern distributing in the furnace of the model. The simulating gas spouted from front and rear walls resulted a more even mixture characteristic, and the tangentially ejected simulating gas is more suitable for the tangentially pulverized coal-fired boiler, and the tangentially ejected OFA is also of advantage to it. The effect of quantities and locations of the simulating gas on the mixture characteristic was also discussed.