Research and development of domestic catalytic combustor.

概要

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Recently, the concerns for improved indoor air quality have been increas-ing. For domestic combustors, the emissions of concern are CO, HC, and NOx .Reduction of these gaseous pollutants is feasible by replacing the conventional flame-type combustor with a new combustor design. The catalytic combustor is a particularly attractive technique for simultaneous reduction of CO, HC, and NOx, emissions.To develop a domestic catalytic combustor, platinum group metals supported on a ceramic honeycomb were prepared as a catalyst, and their performances for kerosine combustion were investigated. The main results obtained are as follows. 1) The carrier using 33μm diameter of fused silica has a higher thermal shock resistance than that of using 33μm diameter 2) The optimum amount of platinum group metals on the carrier was between 1-1.5kg/m3. 3) The optimum cell density of the carrier was between 300-400 (1/in2), and optimum depth of the carrier was between 10-20mm. 4) The preferable range of excess air ratio was between 1. 3-1.5. 5) Concentration of NOx in exhaust gas from the test catalytic combustor was about 0.2ppm when the temperature of the catalyst was 800-900°C.
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