David Orus Fitts

Dry, Low Emissions for the H’ Heavy-Duty Industrial Gas Turbines: Full-Scale Combustion System Rig Test Results

The lean, premixed DLN2.5H combustion system was designed to deliver low NOx emissions from 50% to 100% load in both the Frame 7H (60 Hz) and Frame 9H (50 Hz) heavy-duty industrial gas turbines. The H machines employ steam cooling in the gas turbine, a 23:1 pressure ratio, and are fired at 1440 C (2600 F) to deliver over-all thermal efficiency for the combined-cycle system near 60%. The DLN2.5H combustor is a modular can-type design, with 14 identical chambers used on the 9H machine, and 12 used on the smaller 7H. On a 9H combined-cycle power plant, both the gas turbine and steam turbine are fired using the 14-chamber DLN2.5H combustion system. An extensive full-scale, full-pressure rig test program developed the fuel-staged dry, low emissions combustion system over a period of more than five years. Rig testing required test stand inlet conditions of over 50 kg/s at 500 C and 28 bar, while firing at up to 1440 C, to simulate combustor operation at base load. The combustion test rig simulated gas path geometry from the discharge of the annular tri-passage diffuser through the can-type combustion liner and transition piece, to the inlet of the first stage turbine nozzle. The present paper describes the combustion system, and reports emissions performance and operability results over the gas turbine load and ambient temperature operating range, as measured during the rig test program.Copyright

Combustion System Performance of a Water Injected MS7001E Gas Turbine Operating at a NOx Emission Level of 25 PPMVD

This paper presents the results of emissions testing and combustion system dynamics testing of a “Quiet Combustor” equipped MS7001E gas turbine at the Midway Sunset Cogeneration Company in Fellows, California. Water injection is used to control NOx emissions to 25 ppmvd without selective catalytic reduction. Test results include NOx, CO, unburned hydrocarbons, VOC, and formaldehyde emissions levels, and combustor dynamic pressure levels. Combustion system hardware mechanical performance is described following the initial combustion system inspection.© 1990 ASME