族组分对原煤流动性的影响及其作用机制

Effect of coal group components on pyrolysis fluidity of raw coal and its mechanism

为了研究煤族组分含量及热解特性与原煤热解流动性的关系,将炼焦煤全组分分离后各族组分收率Y_(DMC)、Y_(LMC)、Y_(HC)、Y_(LC)和疏中质组奥阿膨胀度(a+b)_(LMC)对lg F_(wa)进行多元线性回归,采用逐步回归分析法解释变量的筛选,并从族组分组成结构角度解释了不同族组分对原煤流动性的作用机制。结果显示:重质组在原煤中起到"骨架"作用,是阻碍原煤流动性的主要组分,其含量是影响煤流动性的决定性因素;密中质组虽然是促进煤流动性的主要组分,但其含量对原煤流动性只起到辅助作用。对原煤流动性来说,只需要适当的密中质组产生胶质体液相起到"润滑"作用即可;密中质组与重质组间存在一定的协同作用共同决定了原煤流动性,而轻质组含量、疏中质组含量及其性质(膨胀性)对原煤流动性没有显著影响。

Y_（DMC）、Y_（LMC）、Y_（HC）、Y_（LC） and （a＋b）_（LMC） were related to lg F_（wa） by means of multiple linear regression in order to study the relationship between coal group components and their pyrolysis characteristics with pyrolysis fluidity of raw coal.Stepwise regression analysis was used to explain selection of variables and mechanism of different group components on the fluidity of raw coal was clarified from the component and structure of coal group components standpoint. Results show that heavy component plays a skeleton role in raw coal and it is the main component hindering the fluidity of raw coal.Content of heavy component is the decision factor affecting the fluidity of raw coal.Content of dense medium component only plays an auxiliary role in the fluidity of raw coal although the dense medium component is the main component to promote the fluidity of raw coal.Moderate dense medium component is necessary to produce moderate fluid phase to play a lubrication role.There is synergistic effect between dense medium component and heavy component,which determins the fluidity of raw coal,while light component and loose medium component have no significant influence on the fluidity of raw coal.