CAJ | 학술논문

在水平管式炉上制得徐州烟煤在Ar, N_2和CO_2气氛下热解的煤焦,比较了其在元素组成、挥发分收率、化学组分、微观结构特性和孔分布特性方面的差异,并在热重分析仪上进行了燃烧试验,确定3种煤焦在O_2+Ar, O_2+N2和O_2+CO_2气氛下的燃烧动力学特性.结果表明:由于CO_2对煤焦的气化作用,CO_2气氛下煤热解较Ar或N_2气氛下具有更高的挥发分收率;CO_2气氛热解焦芳香族和烷基官能团含量均高于其他气氛热解焦,但羟基官能团含量比它们低;CO_2气氛热解焦具有更丰富的2～4 nm的小孔结构,比表面积是其他气氛热解焦的100倍左右,比孔容积约为其他气氛焦的1.5倍.燃烧的化学反应动力学分析表明,不同气氛下煤焦燃烧均为一级反应,CO_2气氛热解焦具有最小的活化能和指前因子.
재수평관식로상제득서주연매재Ar, N_2화CO_2기분하열해적매초,비교료기재원소조성、휘발분수솔、화학조분、미관결구특성화공분포특성방면적차이,병재열중분석의상진행료연소시험,학정3충매초재O_2+Ar, O_2+N2화O_2+CO_2기분하적연소동역학특성.결과표명:유우CO_2대매초적기화작용,CO_2기분하매열해교Ar혹N_2기분하구유경고적휘발분수솔;CO_2기분열해초방향족화완기관능단함량균고우기타기분열해초,단간기관능단함량비타문저;CO_2기분열해초구유경봉부적2～4 nm적소공결구,비표면적시기타기분열해초적100배좌우,비공용적약위기타기분초적1.5배.연소적화학반응동역학분석표명,불동기분하매초연소균위일급반응,CO_2기분열해초구유최소적활화능화지전인자.
The coal chars were made from Xuzhou bituminous coal pyrolyzd in Ar, N_2 and CO_2 atmospheres in a horizontal tube furnace. The elemental compositions, volatile yields, the chemical compositions, the morphologic features and pore distributions of the three kinds of char were measured and compared. The combustion experiments under O_2 + Ar, O_2 + N_2 and O_2 + CO_2 atmospheres were carried out with a thermogravimetry analyzer and their combustion kinetic parameters were determined. Results show that the volatile yield under CO_2 atmosphere is greater than those under other atmospheres due to the gasification effect of CO_2. Coal char under CO_2 atmosphere contains more aromatic group and aliphatic group but less hydroxyl group than those under other atmospheres. The coal char under CO_2 atmosphere has more small pores at around 2 to 4 nm. Its specific pore area is a-bout 100 times and the specific pore volume is about 1. 5 times of those in other atmospheres. The combustion kinetic parameters indicate that all the combustion reactions of coal chars under different atmospheres belong to the first order reactions, while coal char under CO_2 atmosphere has the smallest activation energy and pre-exponential factor.