A LOW-TEMPERATURE, MOVING BED CATALYTIC REACTOR FOR CONTROL OF NOX EMISSIONS FROM COAL COMBUSTION.

摘要

An apparatus for low-temperature N Osubx/sub-reduction is disclosed, which is useful in boiler installations used at electric-generating plants. The apparatus employs one or a plurality of moving-bed reactors wherein a moving bed of common base-metal catalyst is used for selective catalytic reduction of NOsubx/sub present in flue gas. The moving bed permits continuous introduction of fresh or regenerated catalyst, thus obviating the conventional problems of sulfur-poisoning and consequent reduction in catalytic activity with such catalysts. Due to the lower activation energies of such catalysts, an SCR utilizing the moving-bed reactors disclosed herein can be located downstream of the air heater, further improving electric-generating efficiency. Methods for low-temperature NOsubx/sub reduction are also disclosed.