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Experimental Investigation of Combustible Gases from Primary Combustion Chamber of a High Temperature Air Combustion Incinerator

Incineration is an alternative way to dispose of municipal solid waste. It has more advantages, e.g., reduction in volume and weight of waste, destruction the contamination in waste, recovery of energy, etc., but it’s drawback is the higher net treatment cost compared to disposed in landfill. The overall objective of the research is to overcome a higher operating cost of the incineration by applying High Temperature Air Combustion (HiTAC) technology, i.e., supplied of highly preheated combustion air above an auto-ignition temperature of combustible gas from primary combustion chamber (PCC) to completely burn these gases in secondary combustion chamber (SCC) without or minimizing an auxiliary fuel; the highest portion of all of the treatment cost. The specific objectives of this study are to investigate the concentraion, heating value and gas flow rate of combustible gas from PCC in difference of primary air flow rate and chamber’s temperature which are importance to design the SCC and determine secondary air flow. The experiment were conducted in a lab-scale 17.5-kW of capacity controlled-air incinerator with the range of primary air flow rate 0 - 20 percent of stoichiometric air and sawdust was used as a solid fuel. The sample gases were analyzed by two gas analyzers. One was an on-line gas analyzer which indicated directly and continuously the composition of the gas. Another one was Gas Chromatography that measured percent composition of CO2, CO, CH4, N2, H2 and O2. The major components of combustible gases are carbonmonoxide and hydrogen. The composition and heating value of combustible gases are highest at primary air flow rate of 10 percent of stoichiometric air and the chamber preheating temperature of 700 o C with 2.6664 MJ/Nm 3 of HHV, gas flow rate of 1.80 Nm 3 /h and gas yield of 0.51 Nm 3 /kg-sawdust.