Abstract
We have developed a new exhaust-gas cleaning system using ceramic filters and a sodium reactant that removes particulates and acid gases in the temperature range of 300℃. This system has been applied to a kiln-type pyrolysis gas melting plant for MSW (70t/24h×2 units). As the heat source for the pyrolysis, the exhaust gas from burning the combustible gas generated by the pyrolysis process is used in this plant. This new filtration system has been applied to this exhaust gas in the temperature range of 300℃ for the removal of acid gases and the particulates. The filter element is made of ceramic (produced by Kyocera Co.) and is stronger than those made of fabrics. This plant put into operation with load in June of 2005. The dust-collection efficiency of the ceramic filter has been over 99.8% with the pressure loss of roughly 2.2kPa at a filtration speed of 1.5m/min. To prevent the corrosion of the heating pipes that carry the combustion exhaust, the HCl concentration after the exhaust-gas cleaning was set at 15ppm by controlling the reagent feed rate, enabling a stable operation within the corrosion-free state.
