燃煤电站锅炉运行过程中NO_x排放的预测方法

Prediction Model for NO_x Emissions During the Operation of Pulverized-coal Fired Utility Boiler

燃煤电站锅炉实际运行过程中,在煤质等变化时需对燃烧进行必要的调整以保持锅炉的运行性能和低的NOx排放浓度。运行人员可以根据机组的性能和运行经验对各因素变化及相应调整的影响进行评估,以确定较佳的调整方式和幅度。电厂运行过程中对锅炉NOx排放的预测控制的常用方法,主要包括基于燃烧调整试验的经验方法、基于优化控制的数学模型方法和CFD性能模拟和分析方法。在对锅炉NOx排放的预测和控制的常用方法的国内外研究和应用现状评述的基础上,采用CFD技术对先进燃烧系统锅炉的运行进行模拟研究和性能分析,以实现锅炉安全稳定、高效和低NOx排放运行的目标。

During the operation of pulverized-coal fired boiler,essential combustion adjustments are required for the boiler to maintain good operation performance and low concentration of NOx emission when coal quality and other factors change.Operation personnel can evaluate the impacts of the variations of the factors and the corresponding adjustment measures based on the unit performance and their operational experience so as to determine the better mode and extent of the adjustment needed.The commonly used methods for the prediction and control of boiler NOx emissions during power plant operation mainly include the empirical method based on combustion tuning tests,the mathematical model method based on optimization control and the method based on CFD simulation and performance analysis.Based on the review on the current status of the investigation and application of boiler NOx emission prediction and control,CFD technology was applied for the numerical investigation and performance analysis of the boiler with advanced combustion system to realize the goal of safe,stable,highly efficient and low-NOx operation of the boiler.