Glenarm Power Campus Replace GT 3 & 4 CO and SCR Catalyst, Pasadena, CA

The City of Pasadena also known as Pasadena Water & Power (PWP) Units 3 and 4 consist of two independent GE LM 6000PC Gas Turbine Generators (GTG) in simple cycle mode and additional support equipment for the power plant. The units were constructed in 2003. The units are located at the Glenarm power campus bounded by Glenarm Street on the north, the Arroyo Seco (110) Parkway on the east, State Street on the south and Fair Oaks Avenue on the west in Pasadena, California. The purpose of the two horizontal flow Emissions Reduction Units (ERU) is to reduce the CO and NOx emissions from each of the GTG exhaust streams. The existing equipment houses both the CO reduction catalyst and the NOx reduction catalyst in the Selective Catalytic Reduction unit (SCR). The CO catalyst does not require any additional support equipment to maintain the CO emissions level within the specified requirements. The SCR unit, however, requires vaporized ammonia to complete the chemical reduction of the NOx. For this purpose, an ammonia vaporization skid is provided that takes 19% aqueous ammonia, vaporizes it, and mixes it with heated air. The ammonia vapor is piped to the ERU where it is distributed to the SCR unit. The existing SCR catalyst requires that the temperature range of the inlet exhaust gas to the reduction process be controlled. At lower temperatures, NOx reduction will not occur so ammonia is not injected into the catalyst, and at high temperatures the catalyst will ultimately fail and be unusable. Additional equipment is provided to limit the maximum temperature that the catalyst will be exposed to during the operation of the gas turbine. A tempering air system utilizing redundant 100% capacity air fans, ducting, dampers, and instrumentation is provided for this purpose. Ambient tempering air is mixed with the GTG exhaust, resulting in a lower temperature exhaust flowing through the catalyst. Along with additional supporting instrumentation, a control system utilizing a Programmable Logic Controller (PLC) is used to perform the logic necessary to control the unit. The control panels, one per ERU, are located local to the equipment and have all the necessary operator interface to control the ERU. In addition to this, the controls are equipped with an ethernet data highway communication link to the PWP control system in the control room. Operator monitoring and commands to the local control panels take place over this data highway, giving the operator control of the system from the control room. Bonds required. Prevailing wages apply.