Numerical study on the effects of flue-gas inlet type for the flue-gas-desulfurization wet scrubber

Wet scrubber is the most common reactor of limestone/lime wet flue-gas-desulfurization (WFGD) system. For investigating the effects of its inlet format and inlet obliquity on heat and fluid flow, the commercial software Fluent 6.3 is used to simulate 12 cases which are the combination of the three inlet formats and four inlet obliquity. The demister and spray system are simplified as a layer of porous jump and face injection source respectively. A parameter called velocity non-uniformity of scrubber velocity is introduced to estimate the velocity uniformity in the scrubber. By comparing the slurry evaporation, velocity non-uniformity and pressure drop, it is proposed that, for single inlet, the 15° and 20° obliquity are recommended in priority while for double inlet, 120° double inlets with 15° inlet obliquity is the best choice.