Issues regarding nitrogen oxides in heating furnaces
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Recently, an online flue gas monitoring system was installed on the equipment, and it was found that nitrogen oxide levels were consistently above the allowed limits. Through studies, it was found that the formation of nitrogen oxides is related to the flame combustion temperature and the oxygen content in the furnace. However, the monitoring point in my setup is located in the flue; if there is a leak in the air preheater, then the oxygen level measured there will not reflect the actual oxygen level in the furnace. So, if conversion is done using the oxygen content measured here, isn’t it no longer the true value?
It is possible to determine whether there is internal leakage by checking the flue gas temperature, the negative pressure in the furnace, as well as the frequency control of the exhaust fan and the opening degree of the outlet dampers, so that issues can be addressed promptly