Method for removing contaminants from exhaust gases

摘要

In a method for removing a portion of contaminants, such as nitrogen oxides, from an exhaust gas stream of a combustion process, the exhaust gas stream is conveyed through a gas distributor at an inlet of a wet horizontal spray scrubber. A distributor separates the gas stream into a plurality of spaced apart partitioned gas streams. The gas stream is partitioned in the chamber of the scrubber without the need for any physical partitions or obstructions positioned in the chamber. A preselected number of the partitioned gas streams are mixed with ozone to oxidize the contaminants in the gas streams. The oxidized gas streams are then sprayed with an aqueous medium to capture the oxidized contaminants and remove them from the treated gas streams. The treated gas streams are then recombined with the untreated gas streams. Excess ozone present in the treated gas streams is consumed by oxidation of contaminants in the untreated gas streams before the combined gas stream is released to the atmosphere. The partitioned gas streams selected for mixing with ozone directly correlates to the amount of nitrogen oxides that are desired to be removed from the exhaust gas stream.

主权项

1. A method for the partial removal of contaminants from process gas stream comprising the steps of:
conveying a process gas stream to an inlet of a scrubber, distributing the process gas stream evenly across the scrubber inlet, forming at the scrubber inlet a flow pattern of a plurality of process gas streams partitioned from one another, feeding ozone into contact with selected ones of the partitioned gas streams in the scrubber to oxidize contaminants in the partitioned gas streams, removing the oxidized contaminants from the selected partitioned gas stream, and recombining the selected partitioned gas streams substantially free of contaminants with the remaining partitioned gas streams containing contaminants.