煤及其低温灰的热重实验研究

对神府、小龙潭、阳宗海煤及其对应低温灰进行了热重实验。结果表明：低温灰热重曲线与煤的热重曲线有一定的共性，均表现出比较明显的4个DTG峰；通过分析2种不同气氛下煤及其低温灰的热失重过程，发现与O2/N2气氛燃烧情况相比，O2/CO2 气氛下煤的着火温度Ts、最大失重速率所对应的温度Tm、燃尽温度Th都有所降低，但降低的程度不大，均在10%以内，而不同气氛对低温灰失重过程的影响没有明显的规律性；升温速率对热重曲线有较大的影响，随着升温速率的提高，热重积分曲线向高温区移动，微分曲线最高峰的位置也向右偏移，峰值增加，最大失重速率相应提高；在高温区，煤中的固定碳对矿物质的蒸发过程的影响不大，O2/CO2气氛对矿物质的蒸发有一定的抑制作用。矿物质的蒸发量随升温速率的提高而增加。关键词：；；；；；；

Thermogravimetric Experiment Study on Pulverized Coal and Its Low Temperature Ash

Thermogravimetric experiments of the coal from Shenfu, Xiaolongtan and Yangzonghai and their low temperature ash were compared. It was shown that the thermogravimetric curves of coal and their low temperature ash are common in that both of them have four differential apices. The combustion characteristic of coal and its low temperature ash in two different atmosphere were analyzed. As to the coal, the kindling point, temperature of maximum weight loss, burnout temperature in condition of O2/CO2 are all lower when compared to the atmosphere of O2/N2. But the differences are all within 10%, which can be ignored. There is no obvious rule about the low temperature ash when the atmosphere is changed. The heating rate also has an important influence on the thermogravimetric curve. When the heating rate is promoted, thermogravimetric integral curve shifts to high temperature area, the location of differential curve peak shifts to the right, and the peak value of weight-loss also enhances accordingly. In high temperature, carbon in coal has little influence on the evaporation characteristics of mineral matter. O2/CO2 restrains the evaporation of mineral matter. The evaporated quantity of mineral matter increases with the velocity of heating rate increasing.