Patent ID: 6074619
Filing Date: 2000-06-13
Classification: B01D,F01N,Y02T

Abstract:
Process for selective catalytic reduction of NOx in exhaust gases at temperatures of 200-600.degree. C., the process comprising the steps of:a) injecting a spray of droplets containing a reductant into a duct through an atomizing nozzle and into an exhaust gas;b) passing the exhaust gas loaded with the spray droplets through spaces between plates of a series of stacks of parallel plates, the plates of each stack in the series being positioned at an angle relative to the walls of the gas duct and adjacent stacks, whereby the gas is forced to pass through the stacks in a zig-zag flow pattern and wherein substantially all the spray droplets impinge on the walls of the plates, the diameter of the droplets being larger than a critical diameter at which the droplets are caused to touch the walls when the direction of gas-flow is deflected upon passing through the stacks; andc) passing the exhaust gas, after the last stack, through a layer of monolithic catalyst for selective reduction of NOx by NH.sub.3 with channels parallel to the walls of the duct.