Page 148 - Sustainable On-Site CHP Systems Design, Construction, and Operations

Natural gas
Primary injection Pilot diffusion flame
air inlet Premixing Diffusion
zone zone

Pilot fuel
Primary air Combustor
swirler primary zone Dilution
air injection
Recirculation zone ports
FIGURE 7-2 Example of a DLN combustor concept. (Courtesy of Solar Turbines Inc.)

High
Diffusion Premix
burning burning = NO x measurements
= CO measurements

CO emission
Pilot fuel
fraction/stage

Stage 7
NO x and CO (ppm) NO x emission Stage 6

Stage 5

Stage 4
Stage 3
Stage 2
Stage 1
Low
0 20 40 60 80 100 120
Generator output (%)

Dilution air
Range
Inlet guide venes
Max Min
Adjustment range
Min Max
FIGURE 7-3 Examples of emissions from a DLN combustor operating on natural gas. (Courtesy of
Siemens Power Corp.)