GAS TURBINES IN SIMPLE CYCLE COMBINED CYCLE APPLICATIONS

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GAS TURBINES IN SIMPLE CYCLE COMBINED CYCLE APPLICATIONS ( gas-turbines-in-simple-cycle-combined-cycle-applications )

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Closed loop reliability Steam flow is monitored continuously. Three main monitored parameters are linked to the control system via a redundant interlock. See Figure 51. Fig. 51. Steam cooling continuous monitoring and interlock 5 The interlock allows for both alarm and shut down functions depending on the parameter readings. The three main parameters are (with reference to Figure 51): 1. Cooling steam temperature at the combustion liner outlet, which gives an indication of steam overheating (interlock: alarm and runback). 2. The control system keeps the steam cooling pressure at higher than the combustor shell pressure, so low differential between these two parameters indicates steam leaks (interlock: alarm and trip). 3. Differential pressure across the liner can indicate inadequate steam flow (interlock: alarm and trip). Blade path temperature (BPT) spread monitoring provides a back-up indicator to this system and helps pinpoint where a combustion liner, for instance, may have an integrity problem, such as a crack. There are redundant steam supply strainers with continuous monitoring of the differential pressure across them, to check of obstruction of the steam cooling passages with solid carry over from the heat recovery steam generator (HRSG) or auxiliary boiler. On shutdown, an air purge sequence eliminates the potential for condensate accumulation in the steam cooling circuit. Combustion liner design To allow for steam passage and for better heat transfer properties, the combustion liner design is a double walled structure. Flame temperatures for the F, G and H turbines is the same, however with the G and H designs, the combustor exit temperature is higher. See Figure 52. There is no cooling air mixing with the cooling steam design. 43

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