Abstract
In this paper, NOx emission from the 5-26t/h boilers which are used for the air conditioning or steam source in factory and influence of burning condition on NOx formation are researched. The main results are summarized as follows.
1) NOx emission from such boilers is 1-5kg/107kcal.
2) Boiler capacity doecs not influenced on NOx emission.
3) NOx emission highly depends on flame temperature. As temperature in higher, NOx emission more increases.
4) Heat release rate in combustion chamber has same relation.
5) NOx-Excess air factor relation is divided into three patterns. The pattern that the tested boiler indicated, is determined by the range of excess air factor and fuel-air mixing in combustion chamber.
6) The type of fuel has an effect on NOx emission. NOx emission increases in the order of town gas, kerosene and heary fuel oil. On the boilers firing high N content fuel oil, NOx emission increases. Fraction of N content converted to NOx is 39%.
