POWER October 2014 - 55

COMBUSTION TURBINES
2. Demonstration plant. Two TurboPHASE modules (TPMs) were installed at Atlantic
Power Corp.'s Morris Cogeneration Plant (lower left of photo) and were recently performance
tested. The TPMs each added over 3 MW of quick response capacity to a Frame 6B combustion
turbine and steam turbine system. Courtesy: PowerPhase LLC
sending compressed air to the CT compressor
discharge. The air injection quickly produced
an incremental power increase of about 1.5
MW, ramping up to ~2 MW when the vent
valve was fully closed and injection valve
was fully open. Next, TPM2 was ramped to
full power, and the CT responded by producing
an increase of ~2.74 MW, with the
steam plant power increase following. The
test ended with the load on TPM2 reduced to
75%, followed by opening the vent valve and
closing the air inject valve to the CT. Figure
3 shows the results of the response testing
completed on day one. The TPM was able to
add much, although not all, of the incremental
power from the CT within the 60-second
goal set by the company.
Day Two Tests. The response tests were
repeated on the second day of testing using
TPM1. Figure 4 illustrates the data collected
during these tests, which were very consistent
with the previous day's tests.
The second test of the day was to run both
when using a single TPM. The second test
measured the response or ramping speed of
the plant with one or two TPMs injecting air
into the plant's CT1. Each of the TPMs used
at Morris is powered by MTU 20V4000L32
gas-fired engines, each rated at 2 MW.
Morris is also equipped with inlet chilling
and HRSG duct-firing capability, and both
were in operation during the demonstration
tests. The tests were conducted with the CT at
full power at an ambient temperature that averaged
~85F. At no time during the tests were
the operating limits of the CT exceeded.
Day One Tests. On the first day of testing,
compressed air from TPM2 was injected into
CT1 as the system cycled off and on three
times. Data was collected at one-second intervals
and then averaged. CT fuel flow measurements
were taken from plant instruments,
and TPM fuel flow was measured (at the inlet
to the engine) at 16.3 MMBtu/hr as expected.
TPM air injection flow rate was measured by
an annubar-type flow meter on the main air
header prior to entering the CT. The airflow
from each TPM was measured as 11.5 lb/sec
at ~156 psi.
The measured test results at Morris showed
that the average CT power boost was 2.74
MW and that the steam turbine produced
an additional 0.32 MW, for a total power increase
of 3.06 MW per TPM, very close to
the prediction. As an additional benefit, the
TPM compressor intercoolers produced an
average of 1.2 gallons per minute of clean
water during the tests.
The second test of the day was measurement
of the plant response to a demand signal.
The test procedure was to first ramp up
TPM2 to full speed, no load. No compressed
air was produced by TPM2 while the system
October 2014 | POWER
was idling. When warmed up, TPM2 was
ramped up to 75% load while venting the
compressed air produced to the atmosphere
through a vent valve, bypassing the CT.
Simulating receipt of a demand signal with
TPM2 at 75% load, the vent valve was closed
and the injection valve was opened, thereby
TPMs in parallel and inject the produced
compressed air into CT1. The final test simulated
an unexpected trip of a TPM. When
the air supply from TPM2 ceased, a check
valve in the TPM prevented reverse flow, and
TPM1 continued supplying compressed air
to the CT as expected.
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POWER October 2014

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