During Load demand variations, if the airflow cannot be maintained as per
the fuel demand (refer lead-lag control), the fuel flow will be limited by
actual airflow--air limit fuel alarm. In such a case, the load demand (fuel
flow demand) has to be reduced OR additional air fans(FD) have to be started to
increase air flow. We should also check healthiness of Oxygen analyzer as the
error in its reading can give wrong airflow values for control.
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