Fundamental Analysis of Chlorine Distributin Behaviors during Refused Derived Fuel (RDF) Combustion in Fluidized Bed

摘要

The present paper focused on the chlorine distribution during RDF combustion in fluidized beds. To discuss the captured mechanism of chlorine by bottom ash at relatively high temperature (above 1,000 K) and water vapor concentration (about 10%) in which this phenomenon theromodynamically did not occur, the structure and chemical composition distribution on the surface and cross section of bed materials and bottom ash after RDF combustion in fludiized bed at 1,073 K were observed by SEM and EPMA. The thin layer of several #mu#m thickness with Ca and Si were formed on the surface of bed materials and bottom ash, and chlorine was captured in this layer. Furthermore, by the fundamental gas/solid reaction test of the hydrogen chlroide inclusion gas (1,000 ppm) with the different water vapor concentration through CaO fixed bed and, it was confirmed that the amount of captured hydrogen chloride by CaO surpassed a thermodynamic equilbrium calculation result on condition of relatively high water vapor concentration up to 7.9%.