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242 Gas Turbine Handbook: Principles and Practices
holes in the impingement sleeve providing cooling to the transition
piece while the remainder of the flow passes through holes in the
flow sleeve. The air then flows along the annulus formed by the case
and the liner. The combustor uses a conventional film cooling design
based on the experience gained from previous MS7001FA IGCC applications.
Fuel and diluents are introduced through nozzles in the
end cover. The combustor for the IGCC application is a diffusion type
and differs markedly from the standard Dry Low NO x
offering. This
application features a dual gas end cover with large syngas nozzles
and natural gas/doped propane nozzles for the alternate fuel. Steam
injection nozzles are used for power augmentation at high ambient
temperatures and NO x
control. The combustion cases, apart from the
usual provision for spark plugs, flame detectors and cross-fire tubes,
also have extraction ports to supply compressor discharge air to the
gasifier. (Figure 14-5, X-section of Combustor.)
Design verification testing is taking place at the General Electric
Development Laboratory in Schenectady, NY. Gas delivered by trailer
will be blended to simulate the syngas composition predicted for the
MWK gasifier. Test hardware will be fully instrumented to monitor
temperatures, flow fields and dynamic effects within the combustor.
Figure 14-5. X-section of Combustor.