CAJ | 학술논문

制备了4种不同粒度的平三煤和大友煤煤粉,分别采用低温饱和氮气吸附的方法和热天平研究了煤粉的表面结构特性和煤粉的燃烧特性.实验结果表明:随着煤粉粒度的减小,煤粉的孔隙结构发生变化,比表面积和孔容积均增大,表面结构复杂,致使分形维数增大,有利于煤粉颗粒的燃烧,因此,平三煤的着火温度降低了14 ℃,表观活化能均降低了12.3 kJ/mol,燃尽率提高了9.81%,大友煤的燃烧特性变化规律相似.此外,煤粉颗粒的分形维数还能在一定程度上表述煤粉的燃烧特性,因此,分形维数可为煤粉燃烧特性的评价提供一种新的途径.
제비료4충불동립도적평삼매화대우매매분,분별채용저온포화담기흡부적방법화열천평연구료매분적표면결구특성화매분적연소특성.실험결과표명:수착매분립도적감소,매분적공극결구발생변화,비표면적화공용적균증대,표면결구복잡,치사분형유수증대,유리우매분과립적연소,인차,평삼매적착화온도강저료14 ℃,표관활화능균강저료12.3 kJ/mol,연진솔제고료9.81%,대우매적연소특성변화규률상사.차외,매분과립적분형유수환능재일정정도상표술매분적연소특성,인차,분형유수가위매분연소특성적평개제공일충신적도경.
Four particle sizes of Pingsan-originated and Dayou-originated coal were prepared. The surface structure and combustion characteristics of the pulverized coal in different particle sizes were investigated by using respectively the low-temperature saturated nitrogen adsorption method and a thermobalance. The test results indicate that with a decrease of the particle size of the pulverized coal, a change will occur to the pore structure of the pulverized coal. Both the specific surface area and pore volume will increase, and the surface structure, become complicated, thus leading to an increase of the fractal dimension and facilitating the combustion of pulverized coal particles. As a result, the ignition temperature of Pingsan-originated coal goes down by 14 ℃, the apparent activation energy decreases by 12.3 kJ/mol and the burnt-out rate rises by 9.81%. The variation law of the combustion characteristics of Dayou-originated coal is similar to that of Pingsan-originated coal. In addition, the fractal dimension of the pulverized coal particles may represent the combustion characteristics of the pulverized coal to a certain extent.Hence, the fractal dimension will provide a new approach for evaluating the combustion characteristics of the pulverized coal.