基于预数值计算的锅炉飞灰可燃物含量建模

Modeling of the Unburned Carbon in Fly Ash Based on Numerical Simulation in the Utility Boiler

运用四角切圆燃烧煤粉锅炉专用数值模拟计算软件COALFIRE,对某电厂300MW四角切圆煤粉锅炉飞灰可燃物含量排放特性进行了数值模拟。以数值计算结果为样本,建立基于支持向量机的四角切圆燃烧锅炉飞灰可燃物含量预测模型,其预测输出与数值计算结果的最小相对误差为1.01%,说明基于预数值计算和支持向量机算法的四角切圆煤粉锅炉飞灰可燃物含量模型能够较好地对锅炉飞灰可燃物含量进行预测。为将计算结果精确但计算过程耗时较长的数值模拟用于锅炉燃烧工况在线监测,提供了新的思路。

Numerical simulation of the characters of unburned carbon in fly ash on the 300 MW tangentially pulverized coal fired boiler was performed by the numerical simulation software COALFIRE. Taking the result of calculation of number value as the sample, the support vector machine model of unburned carbon content on the 300 MW tangentially pulverized coal fired boiler was set up. Relative error between the predicted output and measured value is 1.01%, it proves the modeling is good for the unburned carbon in fly ash predict. It also provides the new method to use numerical simulation with the accurate result but computational process consuming time longer for combustion operating mode monitor online.