Supercritical carbon dioxide(S-CO_2) Brayton cycle has been research hotspot at home and abroad. Compared with the wide application of conventional steam Rankine cycle

thermodynamic calculation of S-CO_2 boiler is still lack of study. In this paper

by taking the layout scheme of 5 MW S-CO_2 boiler as an example and combing the pipes

furnace and heating surface as a pipeline

numerical simulation model is established through coupling the unit thermal characteristics with tube wall temperature calculation. Both the work fluid temperature and tube wall temperature calculated by this model could satisfy the engineering demand

which has great significance for future work.