Yoshitada Kakuta* and Nobutoshi Tanaka**

* Environmental Engineering Department-1, Engineering Division, TAKUMA Co., Ltd.
** Division of Environment and Resource Engineering, Graduate School of Engineering, Hokkaido University

+ Correspondence should be addressed to Yoshitada Kakuta:
(2-2-33 Kinrakuji-cho, Amagasaki 660-0806 Japan)

Abstract

The gas flow and mixing were experimentally studied by using the reaction between nitrogen monoxide (NO) gas and ozone (O3) gas in a cold combustion chamber model of a MSW incinerator. The flow rate distribution of the NO gas tracer was measured and mixing characteristics of flue gas in the chamber were discussed. In addition, reaction characteristics in the chamber were evaluated by measuring reaction rate which was obtained by actual reaction experiments with NO and O3. A strong correlation between reaction rate and overlap index, which is calculated from the NO tracer distribution measured and may indicate the degree of mixing, was found. Therefore, it is suggested that the mixing has a dominant role for reaction characteristics in the chamber. Experimental data of this study as well as the visualization data of previous papers make it possible to evaluate the effectiveness of computational fluid dynamics methods for the combustion chamber.

Key words: MSW incinerator, stoker type, cold model, reaction experiment, tracer distribution