Novel Flame Stabilization Technique in Porous Inert Media (PIM) Combustion under High Pressure and Temperature

This work presents an experimental investigation to study the characteristics of almost adiabatic combustion using a premixed methane-air mixture within a nonhomogeneous porous inert medium (PIM) under elevated pressure and temperature. To obtain a stable flame under these operating conditions within PIM, a new flame stabilization technique has been developed. The proposed technique avoids the drawbacks of the previous techniques by properly matching flow and flame speeds for a wide range of operating pressures and temperatures. The validity of this new technique has been assessed experimentally in detail by analyzing combustion inside it prototype burner. The effects of various operating conditions, Such as initial preheating temperature and elevated pressure, have been examined for all Output power range between 5 and 40 kW. The experiments covered a broad spectrum of operating conditions ranging from all initial temperature of 20 degrees C and pressure ratio of 1 up to a temperature of 400 degrees C and a pressure ratio of 9. Evaluation of the results revealed very good flame stability with respect to both flashback and blow-out limits throughout all the operating conditions studied, including relative air ratios far beyond the normal lean limit. The Superiority of file new concept was confirmed by extremely low CO emissions, where it zero Value was recorded throughout the whole investigation. The NOx emissions revealed remarkable performance as compared with conventional PIM techniques at ambient conditions. A nontrivial dependence of NOx emissions oil pressure at low relative air ratios hits been observed. Application of this new PIM combustion technique, With its Outstanding low emissions performance, will assist in solving present and Future issues of environmental pollutant emission regulations.