“…The main focus of those systems were to optimize the combustion process, classify flame images, monitor furnace flame, 23 find the temperature of natural gas and combustion flame, detect the unburnt carbons, predict the performance of refuse plastic fuel-fired boilers 19 and Proton Exchange Membrane fuel cells, 20 determine flame status in the burner, 4 combustion diagnosis and control system for burners and control the emission of N 2 O, NH 3 , SO 2, 24 CO, CO 2 , 25,26 NO X , 27 SO X , NO 2, CH 4 , HC, OH, C 2 , N 2, O 2, gases, ash and other pollutants, improve the boiler combustion quality, efficiency, [28][29][30][31] furnace, and boiler cost-effectiveness, 14,32 increase energy conservation, 23 and enhance the performance 33 and burner management. 34 Among those emissions, as mentioned before, some of the products are found as combustible.…”