Heat Recovery Steam Generator (HRSG) Solutions
Today’s operating profiles are taxing on these crucial combined-cycle assets.
Today’s operating profiles are taxing on these crucial combined-cycle assets.
With today’s more complex operating profiles. HRSGs need to be able to swing loads quickly while avoiding temperature excursions. Often, existing automation and controls were simply not designed to handle these operating profiles.
Working with Emerson, you can enhance HRSG operation – optimizing startups and improving steam temperature control.
Overcome Tube Leak Problems with Better Steam Temperature Control
Many plants use PID control which is not ideal for frequent cycling operations. Tube leaks and temperature excursions can be minimized with a better approach to controlling attemperation and steam temperature. Addressing this requires focus on three primary areas:
• Improving the accuracy of the actual temperature measurement
• Utilizing control schemes optimally designed for cycling
• Installing severe service spray valves and attemperators
Plant startups are more and more frequent, yet the responsibility rests on operators to manually start us the unit. Manual procedures and some current operating processes sub-optimize the startup sequence and burn unnecessary fuel. Automated plant starts reduce variability of the process and get the unit online as fast as possible while remaining within operating limits. This lowers both fuel consumption and emissions.
Moving a unit often reveals parts of a unit that are less of a concern during steady state operations. HP, IP, and LP drum level measurement is an example of this. The density changes that occur during plant cycling can cause erroneous readings using traditional measurements. Changing the level measurement technology can greatly reduce errors caused by density fluctuations.
Frequent changes to load demand can reveal automation deficiencies within a unit. A lack of optimization and coordination in a power plant can lead to an inability to execute quick, accurate load changes. In certain markets, this can lead to missed revenue opportunities and lost compensation.
