烟气酸露点的测量和预测模型分析  

Measurement and prediction model for the acid dew point in flue gases

作　　者：向柏祥[1] 赵从振 丁艳军[1] 马润田[1] 吕俊复[1] 

机构地区：[1]清华大学热能工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2015年第10期1117-1124,共8页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九七三"重点基础研究项目(2012CB214900)

摘　　要：防止电站锅炉尾部金属对流受热面的腐蚀粘污和进一步提高锅炉热效率都对锅炉尾部烟气酸露点预测的准确性提出了更高要求。大量电站锅炉机组长期运行经验表明,目前常用的酸露点模型的预测值普遍偏高。该文在前期酸露点测量方法筛选工作的基础上,设计搭建了两种不同的烟气酸露点测量装置,并分别对不同烟气条件下的酸露点进行测量;结合烟气酸露点与其影响因素之间的热力学理论关联式进一步推导出酸露点的预测模型。不同酸露点预测模型的计算结果与相同烟气条件下的实验测量结果的比较表明:相比于抽气式测量的实验结果,插入式测量装置的测量结果对烟气中水蒸气分压的变化更为敏感。The acid dew point in flue gases must be accurately predicted to avoid fouling and corrosion of the heating surfaces and improve the boiler thermal efficiency. Operating experience in many power plants has shown that current models over-predict the acid dew point. Two devices are built to measure the acid dew points for different conditions. Two models are then developed to predict the acid dew point based on thermodynamic correlations between the acid dew point and key factors in the system. Then, the flue gas acid dew points predicted by the models and from previous studies are compared to the experimental data. The results show that the plug-measuring device measurements are more sensitive to variations of the water vapor in the flue gas than the extraction-measuring device measurements.

关 键 词：锅炉 酸露点 效率 腐蚀 

分 类 号：TK229[动力工程及工程热物理—动力机械及工程]