成庄矿3#煤矸石特征温度的热重实验研究

Thermogravimetric analysis on characteristic temperatures of No.3 coal gangue from Chengzhuang coal mine

采集成庄矿3#煤矸石样,通过对其进行不同粒度、不同氧气浓度和不同升温速率的热重实验,分析出煤矸石氧化燃烧过程中9个特征温度,即高位吸附温度T1、临界温度T2、干裂温度T3、活性温度T4、增速温度T5、着火温度T6、最大失重速率点温度T7、失重转折点温度T8和高温阶段最大失重速率点温度T9,并确定出了相应的温度范围。根据实验得到的48组不同的TG、DTG和DTA曲线分析得出:在升温速率和粒度不变的情况下,随着氧气浓度的升高,T1及在T1上的失重量基本不变,其余温度及其温度所对应的失重量降低,最终产物的质量比亦增大;在升温速率和氧气浓度一定的情况下,随着煤矸石粒度的增大,T1、T2、T3、T8和T9升高,但对于T4、T5、T6及T7影响很小。

The coal gangue samples from Chengzhuang coal mine were analyzed on a thermoanalyzer in terms of different particle sizes, different oxygen concentrations and different heating rates. Nine characteristic temperatures and their temperature ranges, namely physical adsorption temperature T1, critical temperature T2, dry temperature T3, activation temperature T4, speed-up temperature T5, ignition temperature T6, temperature T7 at maximum weight loss rate, temperature T8 at weight-loss turning point and temperature T9 at maximum weight-loss rate in the range of high temperatures, were obtained. From 48 sets of different TG, DTG and DTA data, it was concluded that the temperature T1 and the weight loss at T1 remained the same with the oxygen concentration increasing under the conditions of same heating rate and particle size, while the other temperatures and the corresponding weight losses decreased and the final mass ratio of products increased. T1, T2, T3, T8 and T9 increased with the increase of particle size at the same heating rate and in the same oxygen concentration, while T4, T5, T6 and T7 varied little.