The absorber that consists of absorption zone and slurry zone is the key component in WFGD system. The chemical processes in the absorber include lots of heat and mass transfer phenomenon and chemical reactions. In order to describe the processes in full scale WFGD absorber better, absorber is separated to two zones: spray absorption zone and slurry oxidation zone. In spray zone, slurry drop contacts and reacts with the flue gas. The absorbent dissolution and oxidation and crystallization occur in the slurry zone. Size and its distribution of drops, velocity of drops, collisions and coalescence between drops, circulation inside drops, oscillation and distortion of drops and flow patterns in absorber are the complex factors in spray absorber [12]. It is difficult to
describe all the processes in absorber acutely in mathematical theory. Therefore, some assumptions were made as below
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