CAT Titan 250 - Manual (Page 22)

Turbomachinery Package Specification Titan 250 Generator Set
7 Fuel System
7.1 General Description
The fuel system (Figure 10), in conjunction with the control system, includes all
necessary components to control ignition and fuel flow during all modes of operation.
MAIN
FUEL
CONTROL
VALVE #2
TP RT
PRIMARY
SHUT OFF
VALVE
TORCH
REGULATOR
TORCH SHUT
OFF VALVE
VENT
VALVE
V
S
VS VS
TP
TP
MAIN FUEL
MANIFOLD
#2
TO FUEL
INJECTORS
TO TORCH
V
S TORCH
REGULATOR
SECONDARY
SHUT OFF
VALVE
PILOT
FUEL
CONTROL
VALVE
PILOT FUEL
MANIFOLD
GAS VENT
AIR
FUEL
LEGEND
TP = PRESSURE TRANSMITTER
RT = RTD (TEMPERATURE)
VS = VALVE SOLENOID
MAIN
FUEL
CONTROL
VALVE #1
MAIN FUEL
MANIFOLD
#1
TO FUEL
INJECTORS
TO FUEL
INJECTORS
TP
TP
TP
TP
TP
TP TP
Figure 10. Typical Fuel System Schematic
7.1.1 SoLoNOx Combustion System
The SoLoNOx combustion system uses special fuel injectors with main and pilot fuel
ports. The fuel injected through these ports is controlled during starting and steady-state
operation to maintain stable combustion and minimize the formation of nitrous oxides
(NOx), carbon monoxide (CO), and unburned hydrocarbon (UHC) emissions. To further
regulate emission levels, combustion airflow is regulated using a bleed valve mounted on
the combustor case. The SoLoNOx combustion system also includes an additional inlet
gas filter/coalescer for mounting offskid.
7.1.2 Fuel System
The SoLoNOx fuel system includes:
• Supply pressure transmitter
• Pilot air operated primary gas fuel shutoff valve
• Pilot air operated secondary gas fuel shutoff valve
• Pilot air operated gas vent valve
• Electrically operated fuel control valves (2)
• Torch with shutoff valve and pressure regulators
• Main fuel manifold
• Fuel injectors
© 2008 Solar Turbines Incorporated. All rights reserved. TPS250GS/908 - Preliminary
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