CFB锅炉煤成灰特性的6参数模型研究

应用静态燃烧冷态振筛实验方法研究了几种国内煤种的成灰特性并给出了相应煤种的成灰数据库。通过对不同煤种成灰数据库的分析发现，对于任意窄筛分煤，其成灰分布具有双峰分布，即由较细较软的灰成分和较粗较硬的灰成分构成，两种灰成分同时满足Rosin-Rammler分布。提出了6参数模型，该模型可以描述每种灰成分质量份额和相应的粒径分布。通过加权可以得到宽筛分煤的成灰分布。

Six-parameter Model Study of Ash Formation Characteristics of Coals in a Circulating Fluidized Bed Boiler

An experimental method involving static combustion and cold state vibration screening is employed to study the ash formation characteristics of several Chinese coal ranks with the ash formation data-base being given for these coals. Through an analysis of the ash formation data-base of different coals it is found that the distribution of ash formation of an arbitrary narrow sieve fraction assumes a bimodal nature, i.e. being composed of relatively fine and soft ash components and relatively coarse and hard ash ones. These two kinds of ash components can simultaneously satisfy a Rosin-Rommler distribution. A six-parameter model has been set up, which can predict the ash mass portion and relevant particle size distribution of each kind of ash components. By the use of a weighting method the ash formation distribution of coal with a wide sieve fraction can be obtained.