利用固定床反应器研究了改性城市污泥灰对榆林煤热解挥发物的氧化催化裂解作用,考察了NiO负载量对产物分布的影响,并通过TG、XRD、NH₃-TPD、N₂吸附/脱附等表征分析了改性催化剂在煤热解挥发物催化裂解过程中的作用机理。结果表明,与未使用催化剂相比,当使用污泥灰负载20%的NiO为催化剂时,焦油产率从15.58%降到9.96%,但轻质焦油质量分数从58.0%增加到87.5%,气体体积产率增加了2.73倍。催化剂的催化效果随着使用次数增加逐渐降低,表面积碳的累积导致催化剂活性降低。

The oxidative catalytic cracking effect of modified urban sludge ash on Yulin coal is studied by using a fixed bed reactor,and the influence of NiO loading amount on product distribution is investigated.Desorption and other characterizations are conducted to analyze the mechanism of the modified catalyst in the catalytic cracking of coal pyrolysis volatiles.The results show that compared with catalyst-free,the yield of tar by using sludge ash loaded with 20% NiO as catalyst decreases from 15.58% to 9.96%,but the mass fraction of light tar increases from 58.0% to 87.5%.The volume yield of gas increases by 2.73 times.The catalytic effect of the catalyst gradually decreases with the increase of times of uses,which is caused by the accumulation of carbon on the surface area.

郭双淇(1997-),男,硕士研究生,研究方向为煤化工和市政污泥,guoshuangqi1997@126.com