Power Industry Webinar Production & Promotion

Once-Through Boilers Behind H-Class Gas Turbines: Enhanced Efficiency at Lower Cost

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As gas turbines power continues to increase with H/HL/J class, the HP pressure of downstream steam cycles increase as well for better efficiency, up to reach the limit of HP drum technology. Hence, CCPP market is now considering seriously to shift to Once Through HP circuit behind such advanced gas turbines. Besides, the growth of AI, hyperscale data centers, electrification, and renewable integration is accelerating demand for new, high-efficiency power generation. As large combined cycle plants return to the center of power planning, HRSG design is becoming an important lever for improving plant efficiency, flexibility, constructability, and lifecycle cost.

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Key Insights You’ll Gain:

  • Why HP drum limitations of approximately 175–180 bar constrain efficiency and how OTB removes this barrier

  • How eliminating the HP drum approach temperature improves heat recovery and plant efficiency

  • The real-world impact of weight reduction of approximately 5–6% and simplified piping architecture on EPC and lifecycle cost

  • Why OTB enables supercritical operation above 223 bar and further efficiency gains

  • How OTB improves part-load efficiency and helps reduce desuperheating losses

  • Comparison between Horizontal Benson versus Vertical Once Through Boiler technologies