[Tampa Electric Company IGCC project]. Quarterly report, October 1--December 31, 1996 Page: 4 of 16
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Fourth Quarter, 1996: Initial Commercial Operation:
Ten gasifier runs totaling 701 hours were made in October and November, 1996, prior to a
planned outage which began December 5 for routine maintenance, inspections, and some minor
improvements. In the 30 days preceding the outage, the gasifier was on-line 67% of the time and
the gas turbine was on 100% syngas fuel 59% of the time. This was a major accomplishment
which exceeded our target expectations for this period. The longest continuous gasifier run was
7.5 days, and the combustion turbine was on syngas fuel continuously for 7.3 days during this run.
The last four gasifier runs were shut down by transmission system voltage swings external to the
plant. The protections systems have been reconfigured so even minor external disturbances such
as these will no longer trip the unit. These runs are summarized in Table 1.
Gasifier Runs, Shutdown Causes
Early Commercial Operation (October, November and December, 1996)
Run Duration Turbine Shutdown Cause
Number (Hours) On Syngas
11 31.2 2.8 Convective SGC Plugging
12 101.6 16.8 Combustion Turbine Vibration-Rotor Bolt
13 81.9 51.4 Steam Turbine Trip (Excitation) Caused BFW Loss
14 4.5 0.0 Lockhopper Problems
15 54.2 40.4 Steam Turbine Trip (Excitation) Caused SGC Drum Upset
16 17.9 0.0 Main Air Compressor Trip - Execution of DCS Change
17 153.8 149.0 Oxygen Compressor Trip - Transmission System Voltage Swing
18 4.5 0.0 Slurry Feed Pump Trip - Transmission System Voltage Swing
19 71.0 64.6 Main Air Compressor Trip - Transmission System Voltage Swing
20 180.1 174.7 Slurry Feed Pump Trip - Transmission System Voltage Swing
21 33.3 5.9 Gasifier trip on low differential pressure between IP steam'and
22 186.5 157.5 Run 22 continued into January of 1997. Hours shown are for
Total 920.5 663.1
Specific operational experiences and challenges during the commissioning and initial commercial
operational phases are detailed below.
The oxygen plant has operated essentially trouble free through both the commissioning and initial
commercial operational phases. Early high vibration of the main air compressor motor has been
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[Tampa Electric Company IGCC project]. Quarterly report, October 1--December 31, 1996, report, December 31, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc696219/m1/4/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.