Method and apparatus for reducing acid and air toxic emissions i

Details Method and apparatus for reducing acid and air toxic emissions i Method and apparatus for reducing acid and air toxic emissions i

1999-09-20

2000-10-24

Husar, John M.

Solid material comminution or disintegration

Processes

With application of fluid or lubricant material

241 19, 241 2431, 241 48, 241 52, 241 56, 241 791, 241162, B02C 1912, B02C 2324

Patent

active

06135371&

ABSTRACT:
A cylindrical chamber has a drive shaft rotatably mounted therein and extending along substantially the entire longitudinal extent thereof. This drive shaft is rotatably driven by a motor preferably at a speed of about 3600 rpm. Solid particles to be comminuted which may be of coal, limestone/dolomite, or hydrated lime are fed into the chamber. Pressurized air is fed into the bottom of the chamber. Uplifting pressure for driving the air and particles upwardly in the chamber may be provided by pressurized gas in conjunction with a stationary velocity head. The upwardly driven particles are first driven through a plurality of rotors which are driven by the shaft and provide a centrifugal force which comminutes the particles. The particles are then driven through a plurality of semi-permeable screens which are rotatably driven by the shaft and further comminute the particles to a micronized state. To lower NO.sub.x and SO.sub.2 emissions when the micronized particles are combusted, the surfaces of the particles are modified by spraying with an aqueous atomized spray of an agent such as ethylene glycol or magnesium acetate which is injected into the chamber. Second chamber similar to the first. The reduction of acid gases and air toxics in the flue gases emitted from coal fired boilers is completed through duct injections of selected reagents.

REFERENCES:
patent: 5174512 (1992-12-01), Orlandi
patent: 5695130 (1997-12-01), Csendes
patent: 5947599 (1999-09-01), Funk

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