Based on the specifications of ASTM D571095 and BSI BS-3690 for Trinidad Lake Asphalt(TLA) modified asphalt,two residues(CLA1 and CLA2)from direct coal liquefaction(DCL) were evaluated for using as high grade paving a...Based on the specifications of ASTM D571095 and BSI BS-3690 for Trinidad Lake Asphalt(TLA) modified asphalt,two residues(CLA1 and CLA2)from direct coal liquefaction(DCL) were evaluated for using as high grade paving asphalt modifier.TLA was used as comparison.The results show that CLA1-and CLA2-modified asphalt with 7% of CLA1 or CLA2 addition has similar modification ability as 20% TLA-modified asphalt.The modified asphalts meet the specifications for 40～55 or 50 penetration grade.The penetration ratio of CLA2-modified asphalt after TFOT is significantly higher,which indicates its supreme ability to against the temperature aging.Preliminary study implies that DCL residues may be a suitable alternative additive for producing TLA-type modified asphalt.Furthermore it was also found that with increasing amount of CLA1 or CLA2 addition the softening point of the modified asphalts increase and the penetration value and the ductility decrease.展开更多
为了解决煤炭液化残渣在热解过程中软化熔融并剧烈膨胀导致难以利用的问题,在温度范围为30~900℃,升温速率分别为10、20、30、40℃/min的情况下,借助热重分析仪对煤直接液化残渣与褐煤进行程序升温共热解试验,采用Doyle法分析共热解动力...为了解决煤炭液化残渣在热解过程中软化熔融并剧烈膨胀导致难以利用的问题,在温度范围为30~900℃,升温速率分别为10、20、30、40℃/min的情况下,借助热重分析仪对煤直接液化残渣与褐煤进行程序升温共热解试验,采用Doyle法分析共热解动力学,将动力学结果与共热解协同作用进行关联。结果表明:共热解过程可用3个串联的一级反应描述,温度区间分别为200~310、310~470、470~900℃,其中310~470℃对应共热解反应的活泼分解阶段,反应活化能(40~50 k J/mol)远大于低、高温反应活化能(10~20 k J/mol)。液化残渣与褐煤共热解降低了活泼分解阶段的反应活化能,加快了反应速率,增大了热解失重率,使共热解反应在300~550℃表现出正协同作用。展开更多
为研究神华煤和神华煤直接液化残渣的热解过程,对神华煤和神华煤直接液化残渣在不同的升温速率下进行了热重分析。根据不同升温速率的热解试验结果,采用分布活化能模型（Dis-tributed Activation Energy Model,DAEM）对神华煤和残渣的...为研究神华煤和神华煤直接液化残渣的热解过程,对神华煤和神华煤直接液化残渣在不同的升温速率下进行了热重分析。根据不同升温速率的热解试验结果,采用分布活化能模型（Dis-tributed Activation Energy Model,DAEM）对神华煤和残渣的热解动力学进行了分析,得到了热解动力学参数活化能和反应速率常数。研究表明：神华煤热解的活化能为53.98-279.38 kJ/mol;神华煤直接液化残渣热解活化能约为170 kJ/mol。对神华煤和残渣热解失重率随温度变化的试验曲线和模拟计算所得曲线进行比较,发现神华煤和神华煤直接液化残渣的试验曲线和模拟曲线重合较好,说明DAEM模型能够较准确地描述神华煤和神华煤直接液化残渣的热解过程。展开更多
文摘Based on the specifications of ASTM D571095 and BSI BS-3690 for Trinidad Lake Asphalt(TLA) modified asphalt,two residues(CLA1 and CLA2)from direct coal liquefaction(DCL) were evaluated for using as high grade paving asphalt modifier.TLA was used as comparison.The results show that CLA1-and CLA2-modified asphalt with 7% of CLA1 or CLA2 addition has similar modification ability as 20% TLA-modified asphalt.The modified asphalts meet the specifications for 40～55 or 50 penetration grade.The penetration ratio of CLA2-modified asphalt after TFOT is significantly higher,which indicates its supreme ability to against the temperature aging.Preliminary study implies that DCL residues may be a suitable alternative additive for producing TLA-type modified asphalt.Furthermore it was also found that with increasing amount of CLA1 or CLA2 addition the softening point of the modified asphalts increase and the penetration value and the ductility decrease.
文摘为了解决煤炭液化残渣在热解过程中软化熔融并剧烈膨胀导致难以利用的问题,在温度范围为30~900℃,升温速率分别为10、20、30、40℃/min的情况下,借助热重分析仪对煤直接液化残渣与褐煤进行程序升温共热解试验,采用Doyle法分析共热解动力学,将动力学结果与共热解协同作用进行关联。结果表明:共热解过程可用3个串联的一级反应描述,温度区间分别为200~310、310~470、470~900℃,其中310~470℃对应共热解反应的活泼分解阶段,反应活化能(40~50 k J/mol)远大于低、高温反应活化能(10~20 k J/mol)。液化残渣与褐煤共热解降低了活泼分解阶段的反应活化能,加快了反应速率,增大了热解失重率,使共热解反应在300~550℃表现出正协同作用。
