Q&A from Our Recent ‘Heat Rate Awareness’ Webinar

Magnetrol® recently sponsored an information-packed webinar, Heat Rate Awareness: Minimizing Controllable Losses Through Effective Feedwater Heater Level Control. During the webinar, we described how power generation plants can improve their feedwater heater process control – and reduce their heat rate.

Watch the Webinar Archive – and Share it with Your Team
If you are interested in learning how reducing your heat rate can help drive down your facility’s energy costs – we invite you to watch this webinar.

Heat Rate Awareness webinar: Watch it on demand

Answers to Webinar Attendees’ Questions
At the end of the webinar, our heat rate expert Donald Hite answered audience questions. We’re sharing some of these responses so that our readers can also benefit from this information.

  • Question: What instrumentation and control logic would be best for units that cycle weekly, on and off, and have daily deep load following?
  • Answer: On a base load, when one is running at a fixed level, some benefit may be gained in changing technologies if the original transmitters were not calibrated correctly. However, when you start cycling a plant, that’s where older technologies really have a problem. As the cycling process starts and they are coming up and down, the levels really seem to oscillate between different transmitters.

    With Guided Wave Radar (GWR) instrumentation, which is a more modern technology, you don’t see that level fluctuation. Therefore, it is better suited for instances when one needs to cycle the plant up and down.

    In addition, today many companies are using coal plants as “peaker plants” rather than base load plants. This means that you are cycling them more often than normal. Using GWR provides several benefits, including a defined control of level. You’re not guessing, so you are not going to see fluctuations when cycling the plant more often.

  • Question: What are the requirements under ASME for heaters, and which code is referred to?
  • Answer: The ASME 31.11 and the related TDT 1-2004 revision identify requirements for feedwater heaters. While the ASME 31.11 provides general information, you can review the TDT 1-2004 revision to see detailed requirements, which include the recommended number of transmitters and whether you need to have high and low level protection.

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