The control of the combustion process is rather simple compared to for exam- ple the Sysav power plant control discussed in Section 4.1. The controlling parameter is the exhaust temperature from the turbine, with a set-point in the interval of 630-650 ◦C. The controller then regulates the gas flow rate with a valve accordingly, while the air flow rate is simply choked using dampers. From the temperature of the exhaust, the controller can calculate other parameters such as pressure. Various components are measured in the flue gases, such as O2, CO, NOx and CO2, but those are only used to ensure that the emission regulations are fulfilled. The turbine operates at a rela- tively high amount of excess air, with an average of 11-12 % concentration of O2 (M. Blåfält, personal communication, October 21, 2010).
The control of the combustion process is rather simple compared to for exam- ple the Sysav power plant control discussed in Section 4.1. The controlling parameter is the exhaust temperature from the turbine, with a set-point in the interval of 630-650 ◦C. The controller then regulates the gas flow rate with a valve accordingly, while the air flow rate is simply choked using dampers. From the temperature of the exhaust, the controller can calculate other parameters such as pressure. Various components are measured in the flue gases, such as O2, CO, NOx and CO2, but those are only used to ensure that the emission regulations are fulfilled. The turbine operates at a rela- tively high amount of excess air, with an average of 11-12 % concentration of O2 (M. Blåfält, personal communication, October 21, 2010).
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