基于逆向蒙特卡罗法的煤粉炉内辐射能传递计算

The Calculation of Radiative Transfer Inside Pulverized Coal Boiler Based on Backward Monte Carlo Method

针对求解煤粉炉内辐射能传递方程时遇到的大辐射源小接收体现象所带来的时间复杂度问题,提出使用三维逆向蒙特卡罗法来提高求解精度和收敛速度。通过从炉内混合介质到辐射能传感器的辐射投影强度的逆向模拟计算,求解了炉内介质的辐射特性参数,并分析了炉内介质辐射特性的变化与辐射能之间的对应关系,计算结果表明该方法能够节省计算时间并提高计算精度。辐射能传递计算的结果给出了300MW煤粉炉内辐射能信号光谱分布曲线,并显示了炉内辐射能随介质物理特性的变化关系曲线,为基于辐射能信号的锅炉燃烧诊断研究提供了理论依据。

An improved three-dimensional backward Monte Carlo（MC） method was introduced to reduce the time consumption when treating large emitter and small receiver radiative transfer problems inside pulverized coal boiler. The radiative intensity received by small detectors which located in the wall of a 300MW pulverized coal boiler was simulated, and the spectrum character of the participating medium as well as the relationship between the radiation properties of the participating medium with the radiative intensity inside the boiler was discussed by computing the equation of radiative transfer. Comparing to forward Monte Carlo method, the proposed method reduced the time consumption and improved the precision by tracking the energy beam in a reverse mind. The results show that the backward scheme take great advantages in dealing with such problem which provides a useful method for inner boiler combustion diagnostic.