FORFARANDE OCH ANORDNING FOR FORVERMNING AV FORBRENNINGSLUFT OCH FOR KATALYTISK REDUKTION AV SKADLIGA EMNEN I ROKGASER

摘要

An apparatus and a method of pre-heating combustion air and catalytically reducing noxious substances in flue gas employing a two-part heat-exchanger which is traversed from top to bottom by a plurality of catalytically active separately movable heat-storage elements are described. The combustion gas is heated in a first portion of the heat-exchanger by heat transferred from the heat-storage elements and the noxious gases are catalytically reduced in a second portion of the heat-exchanger downstream from the first portion in the path of the elements in the presence of ammonia and catalytically active heat-storage elements. The catalyst-coated heat-storage elements can be removed from circulation and replaced by unspent or regenerated elements when the residual content of noxious substances in the flue gas remains elevated.