粉煤灰干燥特性的试验研究

对所用的粉煤灰进行了粒度分析并测得其物理性质;在不同的干燥工况下对粉煤灰做了大量试验,对实验数据进行了拟合,建立干燥特性方程,针对影响干燥速率的主要因素及热质传递规律进行了分析。结果表明,粉煤灰所含水分大部分为非结合水,温度、风速对粉煤灰的干燥速率影响明显;堆积的粉煤灰穿流干燥时不具有典型的3个干燥阶段。试验结果可为粉煤灰干燥器的设计提供依据。

Experimental study on drying characteristics of wet fly ash

Granularity analysis of fly ash was done and its physical properties were measured. Many experiments were conducted in different drying conditions, the data were regressed, and the equations of drying characteristic of fly ash were established. The main factors that influenced drying rate and the heat and mass transfer were analyzed. The experimental results show that the water contained in fly ash is unbound water, and the influence of temperature and air speed on drying rate is obvious; the accumulational fly ash has not three classical drying stages when it is dried by through drying. The experimental results can also offer some basis for the design of coal fly-ash dryer.