Spray nozzles, with either a single fluid or dual fluid design, may be added to the ESP to allow for the introduction of a substantially clear liquor (a solution contaming very little undissolved solids, rather than the slurries used in conventional lime mestone scrubbers) into the volume surrounding the wet collector plates. The clear liquor may comprise a neutralizing solution of a sodium reagent. In another mbodiment, the clear liquor is a sodium sulfite scrubbing solution. In another embodiment, the clear liquor may be alkaline. As the flue gas passes through the spraysofclear liquorscrubbingsolution,theSOxis absorbed by the alkali water droplets. Further, with a sufficient volume of liquor directed toward the collection plates, a moving liquid film is created on the wet collector plates that continuously sweeps away the particulate matter deposited on the plates by the electrostatic forces in the ESP. The nozzles and plates may be arranged so that the quantity of liquid drops that exit from the last set of collection plates is minimized. Therefore, the solid particulate matter from the exhaust gas is electrostatically attracted to the collection plates, while the SOx gas is neutralized by the clear liquor scrubbing solution.
|
