Depth assessment of energy storage and load response characteristics in supercritical circulating fluidized bed cogeneration units

Jiongnan Guo, Mingming Gao, Jizhen Liu and Guangxi Yue

Energy, 2025, vol. 333, issue C

Abstract: Circulating fluidized bed (CFB) cogeneration units, as flexible energy sources, face complex interactions of combustion, fluidization, and heat transfer, which limit the full utilization of their energy storage capacity. To enable the integration of renewable generation, it is essential to quantify the energy storage characteristics across a range of operating conditions. In this work, an evaluation method was developed for boiler-side, steam-water, condensate throttling, and heating network energy storage in CFB units. Radiative energy storage coefficients of burning carbon in the lower furnace and of fine circulating bed materials (FCBMs) in the upper furnace were derived from combustion and heat-transfer analyses. The energy storage coefficients of the working fluid and metal surfaces for different steam–water sections were determined based on thermodynamic properties, operational states, and component structures. In addition, a quantitative model for condensate throttling and heating network energy storage was established, and the influence of thermal efficiency variations on the load response rate and available storage time was identified. Through application to a 350 MW supercritical CFB unit, the distribution and dynamics of energy storage across its components were characterized, providing a theoretical foundation for energy storage utilization and rapid load-change control.

Keywords: Circulating fluidized bed; Energy storage; Wide load; Cogeneration; Condensate (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:333:y:2025:i:c:s0360544225030762

DOI: 10.1016/j.energy.2025.137434

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