The New York State Department of Environmental Conservation is taking comment until May 27 on a draft Title V air permit that covers several operational changes requested by Indeck-Oswego LP for its Indeck-Oswego Energy Center in Oswego, N.Y.
Indeck-Oswego operates a General Electric Frame 6 gas turbine-generator (of about 44 MW capacity). Duct burners add supplemental heat to a heat recovery steam generator, which supplies steam to a condensing steam turbine (about 17 MW). NOx emissions are controlled with steam injection. NOx and CO emissions are measured using continuous emission monitors.
Indeck is proposing the following operational changes under this revised permit:
- The permit restricts operation of the GT to 80% load or higher. Indeck wants to be able to go down to 50% load.
- The duct burner can only operate when the GT fires natural gas. Indeck wants to use the DB when firing oil in the GT. (The DB only fires gas.)
- Indeck wants to be able to co-fire oil and gas in the GT, at the same time. During periods of co-firing, the stack limit would be a pro-rated limit based on relative heat inputs. That is, the co-firing limit would be a mix of the current limits for gas and oil.
Projected emissions from these changes would be less than the significance level for all pollutants (e.g, less than 40 TPY NOx). The project does not re-trigger PSD.