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Novel partial-subsidence tower-type boiler design in an ultra-supercritical power plant

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  • Xu, Gang
  • Xu, Cheng
  • Yang, Yongping
  • Fang, Yaxiong
  • Zhou, Luyao
  • Zhang, Kai

Abstract

An increasing number of tower-type boilers have been applied to ultra-supercritical power plants because of the simple design of the membrane walls and the smooth increase in temperature of such boilers. Nevertheless, the significant height and long steam pipelines of this boiler type will expand the power plant investment cost and increase steam-side pressure losses, especially for higher parameters units requiring high costs of nickel-based alloy materials. Thus, a novel partial-subsidence tower-type boiler design was proposed. In this boiler type, nearly 1/2–2/3 of the boiler height was embedded underground to reduce the height of the boiler and the length of the steam pipelines significantly. Thermodynamic and economic analyses were conducted on a state-of-the-art 1000MW ultra-supercritical power plant and a prospective 700°C-stage double reheat power plant. Results showed that the proposed tower-type boiler design could result in a 0.1% point increase in net efficiency and a $0.56/MWh reduction in the cost of electricity in a 1000MW power plant. This economic benefit was enhanced for power plants with higher steam parameters and larger capacity. The concept of the proposed boiler design may provide a promising method for tower-type boiler applications, especially in new-generation double reheat plants with higher parameters.

Suggested Citation

  • Xu, Gang & Xu, Cheng & Yang, Yongping & Fang, Yaxiong & Zhou, Luyao & Zhang, Kai, 2014. "Novel partial-subsidence tower-type boiler design in an ultra-supercritical power plant," Applied Energy, Elsevier, vol. 134(C), pages 363-373.
    • Handle: RePEc:eee:appene:v:134:y:2014:i:c:p:363-373
    DOI: 10.1016/j.apenergy.2014.08.043
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