Combined Cycle Gas Turbine Startup Emissions -Quantification Methodology and Permitting Strategies

摘要

While startups have been defined in the past as 'Cold', 'Warm' and 'Hot', it has been determined that these definitions, based in part on ST rotor and/or HRSG drum temperature, have no bearing on actual SU emissions. Other than reduction of GT engine emissions and decreasing time spent at lower loads (where CO and VOC emission are highest), SCR and oxidation catalysts have the greatest impact on reducing SU/SD emissions. Optimal catalyst operation (defined as maximum emissions reduction) occurs only once the catalysts have heated up sufficiently (as defined by manufacturer's operating curves, but typically in the ～ 600-700℉ range). Once the catalysts have cooled down below ～ 300-400℉, their ability to remove emissions is essentially nonexistent.