非常规服役超临界锅炉的微纳尺度腐蚀动力学模型建立及应用  

Corrosion micro-nano scale kinetics model development and application in non-conventional supercritical boilers

作　　者：李艳辉[1,2] 丁邵明 白周央 张一楠 于智红 邢利梅 高鹏飞 王永贞[2] LI Yanhui;DING Shaoming;BAI Zhouyang;ZHANG Yinan;YU Zhihong;XING Limei;GAO Pengfei;WANG Yongzhen(Key Laboratory of Thermo-Fluid Science and Engineering,Ministry of Education,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China;School of Civil Engineering and Architecture,Linyi University,Linyi 276000,Shandong,China)

机构地区：[1]西安交通大学热流工程与科学教育部重点实验室,陕西西安710049 [2]临沂大学土木工程与建筑学院,山东临沂276000

出　　处：《化工学报》2023年第6期2436-2446,共11页CIESC Journal

基　　金：国家自然科学基金项目(22008190);中国博士后科学基金项目(2022M722526)。

摘　　要：深度频繁调峰超(超)临界火电机组燃煤锅炉将服役于温度频繁、大幅度多变的非常规条件,然而,依赖于某一恒定温度下连续暴露时间的传统腐蚀动力学模型无法适用于非常规服役锅炉的腐蚀预测及安全评估。从锅炉高温受热面管内(处于超临界水环境)腐蚀的原子/分子尺度过程出发,提出了适用于超(超)临界锅炉非常服役条件的低密度超临界水环境合金腐蚀微纳尺度动力学模型构建方法,以及该模型在宏观腐蚀数据拟合及微尺度腐蚀过程解析方面的多尺度应用途径;获得了典型材料T92钢的微纳尺度腐蚀动力学模型,建立了以温度和膜厚为自变量的微纳尺度氧化膜生长速率模型,并开展超期服役(已知腐蚀程度)、频繁变负荷(非恒定温度)等非常规服役条件下锅炉的腐蚀预测,可为灵活调峰火电机组安全保障技术的开发奠定基础。Deep and frequent peak shaving supercritical/ultra-supercritical coal-fired boilers of thermal power units will serve in non-conventional conditions with frequent temperature changes and large changes.However,the traditional corrosion kinetic model relies on continuous exposure time at a constant temperature,which is challenging to meet the corrosion prediction and safety assessment of boilers in non-conventional service.According to the fundamental atomic/molecular scale process of corrosion of boiler high-temperature heating tube(in supercritical water environments),this paper proposes a new micro-nano scale kinetic model construction method for the prediction of corrosion in non-conventional conditions and the multi-scale application of the model in macro-corrosion data fitting and micro-scale corrosion process analysis.On this basis,a mechanistic corrosion kinetic model with clear microscopic processes and physical meaning for T92 steel was obtained.And a micro-nano scale oxide film growth rate model with temperature and film thickness as independent variables was developed.Finally,these micro-nano scale kinetic models were employed for the corrosion prediction of boiler tubes with known corrosion levels or/and at frequent variable load(non-constant temperature).It is of tremendous importance for evaluating the safety of large coal-fired boilers in non-conventional service.

关 键 词：超临界水 非常规锅炉腐蚀 动力学模型 多尺度 腐蚀预测 生长速率模型 

分 类 号：TK224.9[动力工程及工程热物理—动力机械及工程]