MILD Combustion: Toward Highly Fuel Flexible Solutions
10:45 - 11:15
Level 0 lecture hall between Al-Jazri and Al-Kindi (buildings 4 and 5)
New paradigms of combustion processes based on advanced fuel conversion concept, such as MILD combustion, give the opportunity to explore the use of a wider energy carriers/fuels palette in a wider power intensity range. Recently, high flexibility of combustion based energy production system became very important, especially in small scale systems which are of primary relevance in the framework of distributed energy production concept.
Generally, combustion systems are optimized to work within a well identified range of operational parameters and with a limited possibility for fuel choice. This is because they mostly rely on flame stabilization mechanisms that are fuel and fluid-dynamical configuration dependent, aiming to minimize pollutant emission while maximizing the efficiency. MILD combustion processes rely on fuel/oxidant local autoignition mechanism onset due to the formation of a mixture of hot exhaust gases and fresh reactants in such a proportion that the local temperature reaches the mixture autoignition temperature. On the other hand, the dilution prevents the stabilization of deflagrative/diffusive structures as a consequence of the local ignition. In fact, the dilution level reached within the mixture causes temperature increases below the threshold needed for the stabilization of a traditional combustion process.
Beside an overview of the evident and elusive features of MILD Combustion, the fuel and power flexibility of these processes will be analyzed in relation to a small scale confined highly recirculated flow field, representing a scale bridging configuration between model reactors and real systems.