%A Xiyan GUO, Yongping YANG %T Thermodynamic models and energy distribution of single-phase heated surface in a boiler under unsteady conditions %0 Journal Article %D 2011 %J Front. Energy %J Frontiers in Energy %@ 2095-1701 %R 10.1007/s11708-010-0117-7 %P 69-74 %V 5 %N 1 %U {https://journal.hep.com.cn/fie/EN/10.1007/s11708-010-0117-7 %8 2011-03-05 %X

A coal-fired power unit frequently operates under unsteady conditions; thus, in order to acquire scientific energy analysis of the unit, thermodynamic analysis of a single-phase heated surface in a boiler under such conditions requires investigation. Processes are analyzed, and distributions of energy and exergy are qualitatively revealed. Models for energy analysis, entropy analysis, and exergy analysis of control volumes and irreversible heat transfer processes are established. Taking the low-temperature superheater of a 610 t/h-boiler as an example, the distribution of energy, entropy production, and exergy is depicted quantitatively, and the results are analyzed.