热风和微波干燥对煤泥品质的影响

Effect of hot air and microwave drying on the quality of coal slime

采用热风和微波两种方式对煤泥进行干燥处理,从主要组分、燃烧特性和水分复吸特性等方面对煤泥干燥产品进行了分析。通过工业分析对比了干燥前后煤泥主要组分的变化,发现两种煤泥干燥过程中煤泥的挥发分、灰分和固定碳含量没有明显变化。采用热重分析研究了原煤泥和两种煤泥干燥产品的燃烧特性,发现除了失水阶段,3种煤泥样品的热重曲线没有较大差异,3种样品的燃烧特性指数十分接近。最后探究了两种干燥方式下煤泥干燥产品的水分复吸特性,发现环境湿度和煤泥含水率对水分复吸特性有显著影响,而干燥方式对水分复吸特性影响并不明显。

The coal slime was dried by hot air and microwave,and the dried slime products were analyzed from the main component content,combustion characteristics and moisture resorption characteristics.The change of the main component content of the coal slime before and after drying was compared by industrial analysis.It was found that there was no significant change in the volatile matter,ash and fixed carbon content of the coal slime during the drying process.The combustion characteristics of the raw coal slime and the dried products of the two slime were studied by thermogravimetric analysis.It was found that the thermogravimetric curves of the three coal slime samples are not significantly different except for the dehydration stage,and the combustion characteristics of the three samples are very close.Finally,the water resorption characteristics of the two coal slime drying products were investigated.It was found that the environmental humidity and the moisture content of the slime have a significant effect on the water resorption characteristics,while the drying method has no obvious effect on the water resorption characteristics.