不同煤种CO释放速率及吸放热特性实验研究

Experimental Study on Absorption and Exothermic Characteristics and CO Release Rate of Different Coals

该文对无烟煤、焦煤、气煤、长焰煤和褐煤这五种不同变质程度煤样的吸放热特性及CO释放速率进行实验研究,同时对五种煤样进行工业分析与元素分析。对不同煤种进行氧化升温实验,得出的实验数据反映了CO的产生与煤的变质程度密切相关;不同变质程度煤样的CO浓度和CO释放速率的增长趋势保持一致;煤的变质程度越低,越容易与O_(2)结合释放CO。对不同煤种进行DSC实验,实验结果表明随着温度持续上升,煤样的吸热速率逐渐升高达到最值后会逐渐下降,而煤样的放热速率前期增长缓慢、后期明显加快,CO浓度及其释放速率持续增长但后期增长缓慢。

In this paper,the absorption and exothermic characteristics and CO release rate of anthracite coal,coking coal,gas coal,long-flame coal and lignite with different metamorphism were studied experimentally.The above five types of coal were tested by industrial analysis,elemental analysis and porosity experiment respectively.On this basis,the metamorphism of coal was analyzed.The experimental data obtained well reflected that the generation of CO was closely related to the metamorphism of coal.The oxidation and heating experiments were carried out on different types of coal,and it was concluded that the growth trend of CO concentration and CO release rate of coal samples with different metamorphism degrees was consistent,and the lower the metamorphism degree of coal,the easier it was to combine with O_(2) to release CO.DSC experiments were carried out on different types of coal.The experimental results showed that with the continuous rise of temperature,the absorption rate of coal samples gradually increased to the maximum value and then gradually decreased,while the exothermic rate of coal samples increased slowly in the early stage and accelerated significantly in the later stage,and the CO concentration and release rate continued to increase but increased slowly in the later stage.