超超临界锅炉水冷壁温度测试方法与应用研究

锅炉水冷壁管温度的测试与控制是火电厂运行过程中的一个难题。通过在某台超超临界参数锅炉水冷壁管特定位置处安装能够同时测试水冷壁管向火侧壁温、背火侧壁温及管内工质温度的测试装置,实时监测水冷壁各工况下的管壁及工质温度变化,分析日常运行中各相关因素对水冷壁温度的影响特性。研究表明,启炉升负荷、变负荷工况吹灰以及水煤比失调等因素易导致或加剧水冷壁管壁温大幅突升,停炉过程和磨煤机投运方式的改变对水冷壁管壁温的影响较小。该测温装置及所得结论对火电厂水冷壁安全运行具有一定的指导作用。

Study on Testing Method and Application of Water Wall Tube Temperature for Ultra-Supercritical Boiler

The measurement and control of water wall tube temperature has been a tough issue in thermal power plants. By virtue of some testing devices which are installed at special locations in the water wall tubes, the temperatures of fireside tube, backside tube and working medium inside the tube are measured and monitored on-line under various operating conditions for the analysis of the impacts of the relevant factors on the water wall temperature in daily operations. The study results show that the ramping up process after startup, the soot blowing during the load variation period and the water-coal ratio imbalance can cause or even aggravate the sharp rise of water wall tube temperature, while the ramping down process or the procedure change of coal mills do not affect much on the water wall tube temperature. The testing device and the study results can provide some guidance for the safe operation of the water wall in thermal power plants.