Filter
Top Products
EPRI Proprietary Licensed Material
Rolls-Royce Aero-Derivative Combustion Turbine Background
2-8
controls water usage to meet emission levels for changes in power demand and ambient
conditions.
The 8-stage intermediate pressure compressor (IPC) and the 6-stage high-pressure compressor
(HPC) are identical to the Aero Trent 800. The HPT and IPT are also single stages and identical
to the Aero 800 Trent. The low-pressure turbine LPT incorporates five stages, of which the first
three stages are identical to the Aero 800 Trent. The last two stages have longer blades because
the low-pressure shaft system is a direct drive system rotating at lower speed than the aero and
the expansion ratio is higher. This increase in expansion ratio is due to the need to extract all the
available energy for power production in the industrial turbine while the aero version retains
some of this kinetic energy to provide thrust.
Like GE’s LM6000, the low-pressure spool rotates at 3600/3000 rpm and is directly coupled to
the generator. No reduction gearbox is required. For 50-Hertz operation, the stagger angle on
the low-pressure compressor blades are changed slightly and the LPC rotates at 3000 rpm. The
industrial Trent is unique in that it is the largest aero-derivative combustion turbine in the world
at 51.2 MW and incorporates the three-shaft arrangement in both the compressor and turbine
sections. The industrial Trent is a hot end drive.
The three-shaft arrangement provides for better stage matching and performance since each
spool is optimized and allows for more efficient operation than an equivalent 2-spool turbine.
This design results in fewer stages, fewer airflow regulating provisions such as variable stators
and bleeds, a shorter turbine, and a high degree of modularity with its attendant benefits during
maintenance.
Figure 2-2
Industrial Trent