Apparatus for controlling pollution from a cement plant

Details Apparatus for controlling pollution from a cement plant Apparatus for controlling pollution from a cement plant

2011-01-04

2011-01-04

Wilson, Gregory A (Department: 3749)

Heating

Processes of heating or heater operation

Including passing, treating or conveying gas into or through...

C432S058000

Reexamination Certificate

active

07862332

ABSTRACT:
A method and apparatus for reducing air pollutants associated with dry process, precalciner cement manufacturing is shown. Raw feed meal used in cement production is heated in a special heating chamber to drive off volatile compounds, such as organic materials and salts of ammonia. Preferably, the feed meal is heated to a temperature of at least 350° F. The gases that are driven off flow to the precalciner where they are combusted and rendered harmless. Heat is provided by diverting at least a portion of the exhaust gases from the cement pyroprocessing kiln to the special heater. The raw feed meal is indirectly heated using a heat exchange wall between the feed meal and the kiln exhaust gas flow. In addition, a base-containing material such as lime or precalcined feed meal, may be added to the raw feed before treatment meal to promote the breakdown of inorganic ammonium compounds, thereby releasing gaseous ammonia which is also destroyed upon subsequent combustion. Hot precalcined meal may also be used to provide some of the heat required to heat the raw feed meal in the special heating chamber.

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