工业锅炉和采暖锅炉燃烧天然气时 ,在正常工作条件下 ,产生的唯一污染大气的有害气体是氮氧化物。在锅炉运行中 ,采用通常的气体分析仪器不难测定出烟气中氮氧化物的含量。然而当建造新的锅炉 ,扩大锅炉容量 ,或因某种原因不便进行实际测定时 ,便需要采用计算方法对新的锅炉环 Industrial boilers and heating boilers burning natural gas, under normal operating conditions, the only polluting the atmosphere of harmful gases are nitrogen oxides. In the boiler operation, it is not difficult to determine the content of nitrogen oxides in the flue gas with the usual gas analyzer. However, when constructing a new boiler, expanding the capacity of the boiler, or actually measuring it for some reason, it is necessary to calculate the new boiler ring