METHOD AND APPARATUS FOR WET TYPE FLUE-GAS DESULFURIZAION

摘要

A wet type flue-gas desulfurization apparatus which is equipped with a nozzle (11) attached to an absorbing tower (1) having a liquid holding tank (2) for an absorbing solution (b) (containing an absorbing agent (a)) to which a combustion exhaust gas (d) containing sulfur dioxide is introduced; and a wet type flue-gas desulfurization method using the apparatus. The nozzle (11) has a delivery port (12) opening in the absorbing solution (b), is connected to a pump (13) recycling the absorbing solution (b) with a pipe (15), and has a throttle (14) and a pipe (17) for absorbing air having an opening (18) which are disposed downstream from the pipe (15) in this order. The throttle (14) has an effective cross-sectional area being less than that of the nozzle (11) disposed downstream from the opening (18) so that a negative pressure region is generated downstream from the throttle, and as a result, a gas-liquid mixed phase stream of the absorbing solution (b) with fine air bubbles is formed in the negative pressure region and is jetted from the opening (18) of the nozzle, to thereby oxidize a sulfite in the liquid holding tank (2) into a sulfate.