燃煤锅炉炉膛灰污染监测的炉膛出口烟温增量方法

Increment of Furnance Exit Gas Temperature for Monitoring Ash Fouling in the Furnace of Coal-fired Boilers

应用非线性化的增量分析方法,将锅炉运行状态与设计状态下的炉膛出口烟温(furnance exit gas temperature,FEGT)增量作为表征炉膛灰污染程度的参数,建立了I-FEGT的计算模型;在经过仿真计算验证模型正确性的基础上,结合某台600MW机组燃煤锅炉实时采集的数据,利用所建模型对炉膛灰污染状况进行了实时监测,结果表明:I-FEGT能正确反映炉膛灰污染程度及其变化。可用于电站锅炉炉膛受热面灰污染实时监测、实时指导吹灰或检验吹灰效果。

By Applying nonlinear incremental analysis methods, the extent of ash fouling in furnace was represented by the increment of furnace exit gas temperature （I-FEGT） between two states： actual running state and designing state. And the mathematical model for I-FEGT was also established. For validating in respect of accuracy, some calculations were carried on in simulation mode. Using the real time data of a coal-fired utility boiler in 600 MW power plant, I-FEGT was calculated for on-line monitoring the varieties of ash fouling in furnace. The results indicate that, I-FEGT correctly reflects the extent and varieties of ash fouling in furnace, can be used for furnace ash fouling monitoring, real-time guidance or checking effect for soot-blowing.