Power Industry Webinar Production & Promotion

Minimizing HRSG Costs and Limitations for Small Scale Power Generation Using Vertical Once Through Boiler Technology

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During this informative webinar, Pascal Fontaine and Caleb Lawrence of John Cockerill, will discuss key features, applications, and benefits of the OTB design.  Specific topics to be addressed will include:

  • How OTB provides for flexible operations, fast steam cycle start-up and shutdown

  • How OTB provides stability of operation at low gas turbine load while maintaining steam temperature 

  • How OTB simplicity of design provides lowest life cycle cost

  • How OTB can control GT emissions in open cycle 

Below are some of the questions discussed during the webinar:

  • Is AVT to CWT required for Feedwater?

  • Can duct firing be used to increase steam flow even at part load on the CT?

  • Can you part load the OTB steam generation independent of the CTG load since you can operate dry?

  • Due to high expansion of the tubes considering all of them at gas temperature before startup, is there any limitation in tube length?

  • Has OTB come to replace the Drum Boiler?

  • How is temperature controlled for SCR? Are there situations where OTB can't run dry due to the max allowable SCR temperature?

  • How many Cockerill OTBs are in natural gas combined cycle service?

  • Is there any difference in GT backpressure for OTB vs. drum boiler?

  • Is there a meaningful difference in capital cost of the boiler feed water pumps in comparison to drum type?

  • What rate of load change of the GT can you cope with while keeping the steam temperature within a range of +-2°C?

  • Why do we need more water supply to HRSG if there is no blowdown?