Thermodynamic Calculation and Research on 1000MW Supercritical CO2 Boiler Under Variable Conditions
Due to the superior capability of CO2 to achieve a supercritical state compared to water vapor,leading to improved boiler efficiency,research on supercritical CO2 boilers has garnered significant attention.This study firstly used a segmented one-dimensional model with high accuracy to perform thermal calculations for the supercritical CO2 boiler.Subsequently,thermal performance of heat transfer surfaces in the downstream flue was analyzed,evaluating the heat absorption characteristics under various operating loads,including full-load and half-load conditions.The results reveal that the impact of load variations differs across heat transfer surfaces.With decreasing load,the heat absorption of components such as the front screen superheater decreases significantly,with reductions exceeding 40%for both the front and rear screen superheaters.In contrast,the heat absorption of reheater components exhibits a relatively smaller decrease.The study further investigates the causes of heat absorption variations and identifies factors influencing the heat transfer performance of these surfaces.This work provides a foundation for future research into the load adjustment characteristics of supercritical CO2 boilers.
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