Method and apparatus for operation of CO/VOC oxidation catalyst to reduce NO₂formation for gas turbine

摘要

A power generating apparatus including a gas turbine engine combusting a fuel in air to produce shaft power and producing a flow of exhaust gases including oxides of nitrogen (NOx), carbon monoxide (CO) and hydrocarbons (HC). An emissions treatment apparatus includes in the exhaust gas flowpath a CO oxidation catalyst disposed at a location with an exhaust gas temperature for which the CO oxidation catalyst advantageously limits NO2 production. The emissions treatment apparatus further includes an ammonia injection apparatus, a mixing section, and a selective catalytic reduction element disposed downsteam of the ammonia injection apparatus and adapted for reduction of NOx.

主权项

1. A method for arranging catalytic elements for treating emissions in a flow of exhaust gases from a gas turbine, comprising:
disposing a carbon monoxide (CO) oxidation catalyst at a location downstream from an exhaust duct of the gas turbine between the exhaust duct and a high pressure heat exchanger in a flow of exhaust gases for limiting NO2 production from NO by the CO oxidation catalyst by placement of the CO oxidation catalyst directly at the exhaust outlet of the exhaust duct without at least one of an intervening heating element and an intervening cooling element; disposing an ammonia injection grid (AIG) downstream from the CO oxidation catalyst and the high pressure heat exchanger within the exhaust gas flow; disposing a mixing chamber downstream the from the AIG; and disposing a selective catalytic reduction (SCR) catalytic element downstream from the mixing chamber.