5MW超临界二氧化碳实验锅炉热力特性与壁温耦合计算模型

Coupled calculation model of thermal characteristics and metal temperature of a 5 MW supercritical carbon dioxide boiler

超临界二氧化碳(S-CO2)布雷顿循环逐渐成为国内外研究的热点。相对于传统蒸汽朗肯循环的广泛应用,S-CO2锅炉的热力计算还缺乏相关研究。本文以某5 MW S-CO2实验锅炉布置方案为例,将锅炉管道、炉膛、高温受热面作为串联管路,将热力特性与壁温进行耦合计算建立数值分析模型。该计算模型气温、壁温计算结果能够同时满足工程计算要求,对S-CO2锅炉研究具有重要意义。

Supercritical carbon dioxide(S-CO2)Brayton cycle has been research hotspot at home and abroad.Compared with the wide application of conventional steam Rankine cycle,thermodynamic calculation of S-CO2 boiler is still lack of study.In this paper,by taking the layout scheme of 5 MW S-CO2 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.