Mild Combustion: Process Features and Technological Constrains

The Mild Combustion is a relatively novel combustion technique characterized by both an elevated temperature of reactants and an adiabatic flame temperature not higher than l600K, These features arc the results of several technological demands coming form different application fields. The main advantages derived by Mild Combustion concern both the combustion process itself and its applications. In the former case the pollution reduction. the increase of efficiency process and fuel flexibility has to be considered whereas the latter one is principally related to heat treatment process and wall confinement. In this paper, characteristics of Mild Combustion arc discussed with particular regards towards the aspects of plant design. A general classification of the processes, where initial and adiabatic tempera- turc values are different from characteristic ones of classical combustion system, is given. This clas- sification leads to a definition of Mild Combustion process as a direct consequence of technological evolution and practical constrains. especially related ro environmental problems. In this sense. the high temperature of reactants and the 10\\' adiabatic temperature, principally obtained using exhausts for both heal recovery and dilution. can not be considered independently. Application of Mild Com- bustion in practical systems infers the use of particular solutions because of high temperature of rcac- tarns involved. In the final part of the paper. specific solutions utilized in a laboratory mild combustor are presented.