Research On Exhaust Gas Emissions Of Gas-phase Combustion And Transient Behavior Of Catalytic Combustion

The experimental studies and theoretical analysis about catalytic combustion wereresearched based honeycomb monoliths in burner by measured experimental data in thisarticle. It was divided mainly into four parts.First, exhaust gas emissions were compared between gas-phase combustion andcatalytic combustion in catalytic honeycomb monolith burner V. Exhaust gasconcentrations of hot-water burner and gas stove have been significantly diluted in largespace. The computing results show that the combustion efficiency of catalyticcombustion was close to100%, which was significantly higher than the same conditionsof gas phase combustion. The main reason of catalytic combustion was oxidized methanecompletely without the concurrent formation of pollutants such as NOX, CO, and UHC.Secondly, exhaust gas emissions were compared between conventional gas-phasecombustion in both forced exhaust gas concentration of hot-water burner&premixednatural gas/air burner with heater and the catalytic combustion in catalytic honeycombmonolith burner VI. Their composition and content were measured, respectively.Meanwhile their combustion efficiency were calculated. Test proved that theconcentration of pollutant emissions of gas-phase combustion are higher than that ofcatalytic combustion. It is shown that the conversion of conventional gas-phasecombustion is lower than that of catalytic combustion.Thirdly, this article discussed exhaust gas temperature and pollutant emissionscharacteristics of the combustion of rich natural gas-air mixtures in Pd metal basedhoneycomb monoliths in burner during the period of start-up process. The burner need tobe ignited by gas phase combustion with the excessive air coefficient (a) at1.3. It can beknown the CH4conversions inhibition of gas phase ignition phenomenon, as will be seenlater, and CO selectivities for the fuel-rich concentrations. The experimental results incatalytic monolith can be explained from SPFR. At the same time, exhaust gastemperature ascended gradually with the increasing of time firstly, then gas temperaturewas stable when the time reached13minutes. The highest temperature among all thetime was measured at14minutes which was1100℃. The finding would be applied forindustrial catalytic combustion process start-up.Finally, the application of catalytic combustion and some problems were analyzed.Exhaust gas emissions were compared between gas-phase combustion and catalyticcombustion. It indicated the advantages of energy-saving and environmental protectionfor the catalytic combustion. Catalytic combustion played an increasingly important rolefor lower carbon emissions in industrial applications.