School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai Coal Gasification Engineering Technology Research Center
School of Chemical Engineering, Xinjiang University
Hydrogen Energy Manufacturing Department of Sinopec Zhenhai Refining and Chemical Company

应用气化技术将脱油沥青(DOA)转化为合成气是一种环保、高效提升脱油沥青附加值的方法。但脱油沥青气化反应活性较低且气化炭黑生成量大,而生物质中的碱金属元素可以有效催化化石燃料的气化反应,故选用稻草秸秆(RS)与脱油沥青共气化以提升脱油沥青的气化反应速率。采用常压热重分析仪(TGA)考察了DOA和RS在不同掺混比(mDOA∶mRS分别为9∶1,8∶2,7∶3,1∶1,3∶7)下共气化的反应特性,并与DOA单独气化的反应特性进行了对比。采用SEM-EDS对共气化产物进行微观形貌和元素分布表征,选择Coats-Redfern法配合Malek最概然机理函数计算共气化动力学相关参数及动力学方程。结果表明:RS主要通过灰分中含有的钾元素催化气化反应,共气化过程中钾由RS转移到DOA表面,在DOA表面通过扩张孔隙形成了新的孔隙,增加了气化反应活性位点;当DOA与RS的掺混比为3∶7时,共气化的协同作用最明显,与DOA单独气化相比,活化能降低约94.7kJ/mol。

Using gasification technology to convert the deoiled asphalt into synthesis gas is an environmentally friendly and efficient method to enhance its added value. However, the gas- ification reaction activity of deoiled asphalt is low, and the amount of carbon black generated dur- ing gasification is large. The alkali metal elements in biomass can effectively catalyze the gasifica- tion reaction of fossil fuels. Therefore, co-gasification of straw (RS) and deoiled asphalt was se- lected to improve its gasification reaction rate. An atmospheric thermogravimetric analyzer (TGA) was employed to investigate the co-gasification reaction characteristics of DOA and RS at different mixing ratios (mDOA∶mRS is 9∶1, 8∶2, 7∶3, 1∶1, 3∶7 respectively). The results were then compared with those obtained when only DOA was used. Scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS) was used to characterize the microstruc- ture and elemental distribution of co-gasification products, and the Coats-Redfern method was se- lected in conjunction with Malek’s most probable mechanism function to calculate the co-gasifica- tion kinetic parameters and kinetic equations. The results show that RS mainly catalyzes gasifica- tion reactions through potassium elements in the ash. During co-gasification, potassium is trans- ferred from RS to the surface of DOA, and the gasification reaction active sites are increased on the surface of DOA by expanding pores and forming new pores; The synergistic effect of co-gasi- fication is most significant when the mixing ratio of DOA and RS is 3∶7, and the activation ener- gy is reduced by approximately 94.7 kJ/mol compared to DOA gasification alone.

国家重点研发计划项目(2022YFB4101504)、新疆维吾尔自治区自然科学基金重点项目(2023D01D02)和上海市2021年科技创新行动计划项目(21DZ1209003).

田 朕,韩 洋,代正华,等.生物质添加对脱油沥青气化的影响及动力学研究[J].煤炭转化,2024,47(3):103-112

TIAN Zhen,HAN Yang,DAI Zhenghua,et al.Effect of biomass addition on gasification of deoiled asphalt and kinetics study[J].Coal Conversion,2024,47(3):103-112