Boiler Audit and Testing
The Fingerprint uses a bottom-up approach to performance improvement. Data collected verifies that basic instrumentation is working as needed, for good operation and control. Configured signal conditioning options are also examined and verified.
Closed-loop control of fuel and air flow, draft, steam temperature, and drum level are examined under steady load conditions, and during load ramps. Disturbance rejection, setpoint tracking, actuator mechanical issues and loop interaction are evaluated.
Where maximizing steam generation capability is desirable, the constraining condition is identified. Examination of process control system logic ensures that the improvement capacity is not artificially constrained by the process control system.
Combustion control logic is evaluated and existing process control system controls are compared to ABB standards.
Cross limiting is examined for effect on load rate of change. Proper use of scaling in the cross limits is verified. The integration of O2 trim with cross-limiting system is checked. Efficiency is accurately evaluated using the losses method.