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The guiding principle for the design of the gas turbine exhaust system was to ensure that the operation of the gas turbine gas compressor unit would not be disturbed by the operation of the waste heat power plant. Compressor station operators are chiefly concerned with achieving high plant availability, avoiding unplanned shutdowns, minimizing back pressure on the gas turbine, and maintaining operational flexibility. The primary means of avoiding a plant shutdown is the bypass stack. During a trip or an unplanned shutdown of the waste heat to power plant, the bypass stack damper opens and the waste heat recovery oil heater damper closes. Figure 2 shows a photograph of the bypass stack and the waste heat recovery oil heater. Figure 2: Waste Heat Recovery Oil Heater and Bypass Stack at the TransGas Rosetown Compressor Station The waste heat recovery oil heater was designed and manufactured by Innovative Steam Technologies (IST) of Cambridge Ontario. Found Energy drew heavily on IST’s expertise in waste heat recovery. IST has been recovering heat from exhaust gas for over 20 years and has over 140 units sold to date in 16 countries around the world. In addition to maximizing the performance of the waste heat recovery, the IST waste heat recovery oil heater was designed to minimize the backpressure on the gas turbine and to maximize the life of the thermal oil, which both reduce the maintenance requirements of the system and ensure the compressor station maintains its performance. Figure 3 is a drawing of the IST oil heater. The oil heater is based on IST’s Once Through Steam Generator (OTSG) design, which was adapted for heat recovery with thermal oil as the working fluid. Cold thermal oil enters the heater and passes through piping that is finned on the exhaust gas side to enhance heat transfer. The internal geometry of the heater has been designed to minimize the oil pressure drop while maintaining a sufficient flow velocity to reduce the oil film temperature. The unit is shipped in three stackable sections: an inlet plenum, the heat recovery module and an outlet plenum. The modular design allows for easy field erection. 4PDF Image | COMBINED CYCLE OPPORTUNITIES FOR SMALL
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