Systems for reducing startup emissions in power plant including gas turbine

An emission reduction system for a power plant including a gas turbine, the system comprising:

• a carbon monoxide (CO) catalyst filter through which an exhaust of the gas turbine passes to remove carbon monoxide from the exhaust, the CO catalyst filter positioned upstream of a heat recovery steam generator (HRSG) operably coupled to an exhaust passage of the gas turbine for generating steam for a steam turbine;
• and
• a retraction system operably coupled to the exhaust passage of the gas turbine, the exhaust passage defining an exhaust path of the exhaust from the gas turbine, the retraction system selectively moving the CO catalyst filter between a first location within the exhaust path within the exhaust passage and a second location outside of the exhaust path,
• wherein the CO catalyst filter extends across only a portion of the exhaust path in the first location, and further includes:
• a damper selectively movable between an operative location in which the damper extends across a remaining portion of the exhaust path not covered by the CO catalyst filter and a retracted position outside of the exhaust path.

An emission reduction system for a power plant including a gas turbine, the system comprising:

• a carbon monoxide (CO) catalyst filter through which an exhaust of the gas turbine passes to remove carbon monoxide from the exhaust, the CO catalyst filter positioned upstream of a heat recovery steam generator (HRSG) operably coupled to an exhaust passage of the gas turbine for generating steam for a steam turbine;
• a retraction system operably coupled to the exhaust passage of the gas turbine, the exhaust passage defining an exhaust path of the exhaust from the gas turbine, the retraction system selectively moving the CO catalyst filter between a first location within the exhaust path within the exhaust passage and a second location outside of the exhaust path;
• and
• a controller operably coupled to the retraction system configured to instruct the retraction system to move the CO catalyst filter between the first location and the second location in response to an emission condition of the exhaust from the gas turbine,
• wherein the emission condition includes a carbon monoxide (CO) level of the exhaust, and
• wherein the controller instructs the retraction system to move the CO catalyst filter to the first location in response to the CO level exceeding a carbon monoxide (CO) limit, and instructs the retraction system to move the CO catalyst filter to the second location in response to the CO level not exceeding the CO limit.