The U.S. Environmental Protection Agency’s Region 6 office will take public comment until Sept. 11 on a draft air permit that would allow Victoria WLE LP to undertake a major expansion of its existing Victoria Power Station (VPS) in Victoria County, Texas.
This is a prevention of significant deterioration air permit under the greenhouse gas permitting program.
The existing VPS is a natural gas-fired combined cycle baseload station that currently operates in a 1 by 1 by 1 (1x1x1) configuration (one combustion turbine, one heat recovery steam generator (HRSG) and one steam turbine).
The project would add a new gas turbine (General Electric 7FA.04 or equivalent) and HRSG equipped with duct burners. After these additions, the facility will be able to operate in a 2 by 2 by 1 (2×2 x1) configuration (two combustion turbines, two HRSG and one steam turbine) that utilizes the existing non-modified M501F combustion turbine and HRSG and the existing non-modified steam turbine.
VPS operations covered by the permit will consist of the following sources of GHG emissions:
- Natural Gas-Fired Combined Cycle Combustion Turbine (GE.7FA.04 or equivalent). The combustion turbine is equipped with a heat recovery steam generator (HRSG) and duct burners, dry low NOx (DLN) combustion system, and selective catalytic reduction (SCR), and oxidation catalyst;
- Process Fugitives; and
- Electrical equipment insulated with sulfur hexafluoride (SF6).
Plant will, after this addition, have a 545 MW (gross) capacity
The GE.7FA.04 or equivalent combustion turbine will have a maximum heat consumption of about 1,816 MMBtu/hr (HHV) and a nominal capacity of up to 177.3 MW. The proposed CTG will be equipped with lube oil vents, an inlet chiller, rotor air cooling fans, and totally enclosed water to air cooled (TEWAC) generators.
Heat recovered in the HRSG will be utilized to produce steam, which will drive the existing steam turbine and associated electrical generator. The new HRSG will be equipped with natural gas-fired duct burners to provide additional steam to the existing steam turbine. The new HRSG will be a natural circulation-type unit similar to the existing HRSG.
The duct burners will be capable of a maximum natural-gas firing rate of up to 483 MMBtu/hr (HHV). The duct burners’ total annual firing will not exceed the equivalent of 4,375 hours at maximum capacity per duct burner. The combined exhaust stream from the new combustion turbine and duct burners will be emitted to the atmosphere through one common dedicated stack.
Depending on the operational configuration, steam produced by the new and/or existing HRSGs will be routed to the existing steam turbine. The new and existing CTGs and one existing steam turbine will be coupled to electric generators to produce electricity for sale to the Electric Reliability Council of Texas (ERCOT) grid.
With this proposed project, the baseload gross power output will be increased from 290 MW to 545 MW. The maximum design gross power output of the new CTG is about 177.3 MW and the maximum output from the existing steam turbine is anticipated to increase by around 60 MW. The new facility may operate at reduced load to respond to changes in system power requirements and/or stability.
A project contact is: Gary Clark, Asset Manager, Victoria WLE LP, (713) 358-9768.