一种灰污热流探针的研制及应用

热流是表征热系统换热效率的一个重要参数，是灰污在线监测中的一个重要物理量。为此，该文基于傅立叶导热定律，设计了一种既能在灰污状态下动态监测热流变化，又能获得不同燃料初始沉积物沉积特性、沉积机理及相对沾污结渣趋势的探针，该探针能准确模拟水冷壁、过热器等受热面的灰沉积过程。通过对新汶两种煤浆的对比燃烧试验，证明了其可行性，从而为研究灰沉积行为、沉积物特性及沾污结渣机理提供一种新的、有效的手段。完全可用于工程实际、中试及实验室研究。

THE DEVELOPING AND APPLICATION OF A HEAT FLUX PROBE WHEN ASH DEPOSITING

Heat flux is an important parameter indicating heat transfer efficiency of thermal systems, and an essential physical parameter for the on-line diagnostic of ash deposition on the heat transfer surface. For this purpose, a probe based on the law Fourier is designed in this paper to investigate the dynamic changes of resultant heat flux when ash deposits on the heat transfer surface, to acquire the depositing characteristics, mechanism of initial deposition process and relative intendency of slagging and fouling for different fuels. Using this probe, the ash deposition process can be simulated on the heat transfer surface, such as water-cooling wall, superheater pipes, et al. Field combustion tests for various fuels including Xinwen coal water slurry and black liquor coal slurry in a 0.25MW furnace showed it is a novel and effective tool for studying ash deposition behavior, deposits properties and mechanism of slagging and fouling. This probe can be applied to the study of ash deposition behavior in large-scale, pilot-scale and laboratory tests.