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Optimal design and thermodynamic evaluation of supercritical CO2 oxy-coal circulating fluidized bed power generation systems by Zhaozhi Li; Yingjuan Shao; Wenqi Zhong; Hao Liu is a Engineering article available to read on EtoBox.

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Replacing the steam Rankine cycle with the supercritical CO2 Brayton cycle (sCO2 cycle) has been demonstrated to be an effective way to improve the efficiency of oxy-coal power plants. The present work focuses on the optimal design of the sCO2 oxy-coal circulating fluidized bed (CFB) power generation systems which so far has not received much attention in the research field. A novel triple recompression sCO2 cycle and a new sCO2 oxy-coal CFB boiler configuration with medium-temperature and high-temperature flue gas recirculation have been proposed and evaluated. With the novel boiler configuration and triple recompression cycle, the system efficiency can be increased by about 1.4% points in comparison to the basic system using the basic recompression cycle and the basic boiler configuration. The influences of the cycle minimum temperature, recuperator pinch temperature difference, furnace inlet oxygen concentration, flue gas recirculation flow distribution and coal itself on the sCO2 oxy-coal CFB power generation system performances were thoroughly investigated. The results show that increasing the minimum cycle temperature and the recuperator pinch temperature difference reduces t

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Author

Zhaozhi Li; Yingjuan Shao; Wenqi Zhong; Hao Liu

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)