二次风偏转对减轻超超临界墙式锅炉高温腐蚀数值模拟

针对某超超临界锅炉日常运行中出现的大范围水冷壁高温腐蚀现象，借助计算流体力学软件Fluent对此锅炉进行相关数值模拟。模拟结果表明：一次风有刷壁的现象，水冷壁壁面区域CO浓度很高，容易导致高温腐蚀的发生。模拟计算结果与现场试验结果相符，证明了模拟的可靠性。在此基础上，对采用二次风偏转来减轻高温腐蚀的方法进行了模拟预测，结果表明此方法可有效地防止水冷壁高温腐蚀发生，为下一步相关改造工作提供了参考依据。

Numerical Simulation of High Temperature Corrosion Reduction by Deflected Secondary Air in a Tangentially Fired Ultra Supercritical Boiler

Aiming at the phenomenon of high temperature corrosion in a large area of the water wall in the routine operation of an ultra supercritical boiler, the numerical simulation using the Fluent software for computational fluid dynamics is conducted. The simulation results indicate that there exists the phenomenon of primary air sweeping the water wall and the concentration of CO in the water wall surface area is high, which is apt to cause high temperature corrosion. The numerical simulation results are proved to be reliable as they are consistent with the test results. Therefore, the simulation on the deflected secondary air alleviating the high temperature corrosion is carried out, which indicates that this method can effectively prevent the high temperature corrosion and it can provide a reference for future’s modification.