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Figure 3: Waste Heat Recovery Oil Heater One additional measure to improve the operational flexibility of the plant was to install an independent purge system for the waste heat recovery oil heater. Before the gas turbine can be started, the National Fire Protection Association (NFPA) requires that the exhaust system downstream of the gas turbine be purged with at least five volume changes and for a minimum of 5 minutes. This ensures that any combustible gases that may be present in the exhaust ducting are evacuated before starting the gas turbine. For this project, a purge air fan was installed directly downstream of the waste heat recovery oil heater damper. This allows the gas turbine’s pre-existing purge system to purge the gas turbine through to the bypass stack, while the additional purge air fan purges the new exhaust system associated with the waste heat to power plant. This allows the compressor station plant operators to quickly startup the gas turbine without being delayed by the additional purge time required for the waste heat to power exhaust system. 2.2 Thermal Oil Circuit The thermal oil circuit transfers the heat recovered in the waste heat recovery oil heater to the ORC plant. Thermal oil is circulated in a closed loop through the oil heater and then through the ORC evaporator before returning to the oil heater. It is possible to eliminate the thermal oil circuit and directly evaporate the ORC working fluid in an evaporator that is heated directly by the exhaust gas. The thermal oil circuit increases the overall equipment complexity with the addition of pumps, piping, tanks, relief valves, instrumentation, etc; however, the thermal oil circuit does have the following key advantages: The thermal oil circuit operates at low pressures, which reduces the cost of the waste heat recovery oil heater. 5PDF Image | COMBINED CYCLE OPPORTUNITIES FOR SMALL
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