石炭の流動層燃焼に伴うNOx生成に関する研究
1977 年 56 巻 8 号 p. 657-665
詳細
1977 年 56 巻 8 号 p. 657-665
Relation between NO formation and the condition of combustion in the experimental small size fluidized-bed combustor was studied using sub-bituminous coal which contains relatively high volatile matter.
Greater part of NO in the flue gas is supposed to be converted from fuel nitrogen because the reaction temperature is relatively low, but the ratio of nitrogen that converted to NO and the total fuel nitrogen is 10-20% and this is in low level. This low level conversion ratio is supposed to be because of lack of uniformity in the combustion chamber.
Formation of NO has intimate relation with the O2 concentration in the flue gas. In the region that O2 concentration is 2-10%, NO formation (calculated NO at O2=0%) increases with increase of O2 concentration.
To supply the secondary air into the free board region is very effective to destroy CO and unburned HC in the flue gas, and this causes a little increase in NO formation.
