Rising to the challenge of DLN tuning.
Burning a lean premixed flame keeps NOx emissions low but results in acoustic instability in the gas turbine. In time, this instability (combustor dynamics) will damage components in the combustion chamber (nozzles, liners, transition pieces) or even downstream components (nozzles, blades), causing unnecessary downtime, increased equipment repair costs, and loss of generating revenue.
Ambient temperature changes can strongly affect combustor stability. Historically, this problem was addressed via seasonal tuning. Tuning is necessary to achieve the best balance between NOx, CO, combustor stability, and dynamics.
However, a better solution is available, whereby the user could monitor the performance of a gas turbine combustor without bringing a tuner to the site. A necessary tool is a Combustion Dynamics Monitoring system (CDMS) that allows the acoustic behavior of each combustor to be continuously observed and documented.