再燃燃料中HCN对NO_x还原的影响

The Effect of HCN Components in Fuel Reburned on NO_x Reduction Rate

燃烧再燃是降低ＮＯｘ 排放的一项重要的炉内措施。通过对再燃区不同的空气过量系数和再燃温度条件下的数值计算，研究了用含有ＨＣＮ 的天然气（ＣＨ４） 作为再燃燃料的再燃过程。研究发现，再燃燃料中含氮组分的存在，以及再燃区的工况条件都对ＮＯｘ 的还原率有很大的影响。因此，在实施降低ＮＯｘ 排放的再燃技术过程中，应当根据实际情况对再燃区的燃烧工况进行优化，选择合适的再燃区温度和空气过量系数。

Fuel reburning is one of the major in furnace measures for reducing NOx emissions. Through a numerical evaluation of the reburning zone under different air excess coefficients and reburning temperatures a study is conducted of the reburning process with HCN containing natural gas (CH4) serving as the fuel being reburned. The results of the study show that the presence of nitrogen containing components and the operating conditions of the reburning zone have a considerable effect on the NOx reduction rate. In view of this, when the reburning technology is employed for reducing NOx emissions, one should strive to optimize the combustion conditions of the reburning zone, depending on existing specific circumstances. Moreover, a proper combustion temperature and excess air coefficient for the reburning zone should also be appropriately selected.