超临界H2O/CO2混合工质汽轮机初凝区中碳酸腐蚀过程的数值模拟  

Corrosion Simulation of Carbonic Acid Corrosion Process in the Initial Condensation Zone of Supercritical H2O/CO2 Mixture Turbine

作　　者：姜涛[1] 王晓放[1] 王巍[1] 马子越 JIANG Tao;WANG Xiao-fang;WANG Wei;MA Zi-yue(Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学,大连116024

出　　处：《汽轮机技术》2020年第6期406-410,446,共6页Turbine Technology

基　　金：国家重点研发计划项目资助(批准号:2016YFB0600104)。

摘　　要：超临界H2O/CO2混合工质汽轮机初凝区中,碳酸腐蚀问题对于汽轮机的安全稳定运行具有很大的影响,因此对于初凝区碳酸腐蚀过程的模拟分析至关重要。首先对初凝区中碳酸腐蚀的腐蚀机理进行了分析,对碳酸的直接还原以及缓冲效应两类机理进行了基本概述。接着对De Waard模型、BP(Cassandra)模型等经典腐蚀模型进行了整理并绘图分析,给出腐蚀速率与其影响因素之间的关系。不同的腐蚀模型,腐蚀速率随影响因素的变化情况有一定差异,但是总的趋势和规律相同。选择一维模型在微观尺度下进行碳酸腐蚀的仿真模拟,并将腐蚀模拟结果与经典腐蚀模型进行了对比分析,二者之间在腐蚀速率计算方法以及影响因素规律方面相互印证。为工程中碳酸腐蚀速率的预测以及超临界H2O/CO2混合工质汽轮机安全防护方面提供一定的参考依据。In the initial condensing zone of the supercritical H2O/CO2 mixture turbine,the carbonation corrosion problem has a great influence on the safe and stable operation of the steam turbine,so it is very important for the simulation analysis of the carbonation corrosion process in the initial condensing zone.In this paper,the corrosion mechanism of carbonation corrosion in the initial condensing zone is analyzed firstly,and the two mechanisms of direct reduction and buffering effect of carbonic acid are summarized.Then the classical corrosion models such as De Waard model and BP(Cassandra)model are collated and plotted to give the relationship between corrosion rate and its influencing factors.For different corrosion models,the corrosion rate varies with the influencing factors,but the overall trend and law are the same.In this paper,the 1D model is selected to simulate the carbonation corrosion at the microscopic scale.The corrosion simulation results are compared with the classical corrosion model,and the corrosion rate calculation method and the influencing factors are mutually confirmed.It provides a reference for the prediction of carbonation rate in engineering and the safety protection of supercritical H2O/CO2 mixture turbine.

关 键 词：H2O/CO2 汽轮机 初凝区 碳酸腐蚀 数值模拟 

分 类 号：TK261[动力工程及工程热物理—动力机械及工程]