Abstract
ABSTRACT
The effect of operating conditions on hydrogen chloride emissions were determined for municipal solid waste combustion in a laboratory-scale fluidized bed incinerator. Experiments were performed according to a statistical experimental design, to examine the effect of bed temperature, limestone feeding rate, excess air, and fuel moisture. The amount of HCl emitted was found to be significantly decreased by limestone addition and slightly increased by bed temperature and waste moisture growth. Capture efficiencies as high as 55–70% without limestone, and 95% with a calcium to chlorine and sulphur ratio of 5.0 was obtained, despite the fact that CaCl2 is not thermochemically stable in the fluidized bed. A comparison with results from a corresponding chemical equilibrium analysis suggested that the high capture efficiency could be either (1) reactions with calcium containing aerosols and particles downstream of the hot reactor; or (2) high-temperature reactions involving complex liquid (or solid) solutions of more stable products.
Key words:
HCl emissions; municipal solid waste; incineration; fluidized bed; statistical design
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