Lean Methane Catalytic Combustion Experimental Study

As a clean and highly efficient combustion technology, catalytic combustion has be attracted more and more attention and was thorough research in the world. In the paper catalytic combustion of the lean methane was researched.It was analyzed that catalytic combustion mechanism in porous media. Combustion reaction in porous media consists of catalytic surface reaction and homogeneous reaction. As a result of the participation of the catalyst, catalytic surface reaction rate is about 260,000 times homogeneous reaction rate. Catalytic reaction speeds up the reaction rate by changing the path of reaction and lowering reaction activation energy. Porous media which has a good thermal stability, relatively high mechanical strength and chemical stability,have the role of the catalyst carrier and the stability of combustion temperature.Device as the fundamental equipment together with the gas system, catalytic combustion burner device and test system was established. Rare Earth catalysts with Silicon carbide honeycomb support were prepared.The cold resistance test experiment was measured. In different conditions of wind speed and aperture size the resistance was carried out, the resistance loss of the porous media was calculated. The results show: flow resistance is linear increase when flow speed is low; flow resistance is rapid increase when flow speed is high in porous media.Methane Rare Earth catalyst combustion experiment was carried out. Catalyst combustion temperature and composition of fuel exhausts were measured and methane conversion was calculated. The results show that methane conversion was above 92% from 200℃to 400℃,methane conversion is above 99% from 500℃to 800℃.