Method of purifying the exhaust gases from plants for the production of cement clinker
AssigneeKrupp Polysius AG
InventorsDetlev Kupper, Ludger Brentrup, Wolfgang Rother
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Abstract
The invention relates to a method of purifying the exhaust gases from plants for the production of cement clinker, in which the filter zone through which the exhaust gases flow contains at least one adsorption stage in which an adsorbent is provided which is suitable for fixing NH.sub.x compounds, heavy metals and/or trace pollutants, at least a proportion of the adsorbent being removed from the adsorption stage at specific intervals of time and introduced into the final burning zone and/or preheating zone. By such a method the NO.sub.x content of the exhaust gases is significantly reduced, and at the same time heavy metals and trace pollutants are eliminated from the exhaust gases.
Claims20
A method of purifying exhaust gases from cement clinker production plants containing NH.sub.x and NO.sub.x compounds in which raw materials are first heated in a preheating zone with hot exhaust gases from a final burning zone and then burnt in the final burning zone to produce cement clinker, said method comprising:
- adsorbing NH.sub.x compounds by passing exhaust gases from the preheating zone through a filter having an adsorption stage containing an adsorbent capable of adsorbing NH.sub.x compounds;
- and
- periodically delivering at least a portion of used NH.sub.x -containing adsorbent from said adsorption stage into at least one of said zones thereby releasing the NH.sub.x compounds contained in the adsorbent for reaction with the exhaust gases and reducing a portion of the NO.sub.x compounds present in such exhaust gases prior to passing such gases to said adsorption stage.
Dependencies are inferred from the claim text.