Decarbonisation of fossil energy via methane pyrolysis using two reactor concepts: Fluid wall flow reactor and molten metal capillary reactor
Decarbonisation of fossil energy via methane pyrolysis using two reactor concepts: Fluid wall flow reactor and molten metal capillary reactor
复制标题
使用两种反应器概念通过甲烷热解实现化石能源脱碳：流体壁流反应器和熔融金属毛细管反应器
DOI：
10.1016/j.ijhydene.2015.03.126
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发表时间：
2015
影响因子：
7.2
通讯作者：
D. Agar
中科院分区：
文献类型：
--
作者：
I. Schultz;D. Agar
化石能源的储量可以满足全球未来几年的能源需求，但其利用受到环境因素的限制。氢气可以通过在 600 °C 以上的温度下热解，从甲烷等化石燃料中产生，不会排放二氧化碳。在流体壁流反应器概念中，加热气体通过多孔反应器壁引入。事实证明，使用孔径为 3 μm 的陶瓷膜和氦气作为加热气体是长期实验的最佳选择。研究了甲烷扩散到外部加热室的影响，并解释了 7 小时内转化率从 53% 下降到 7%，此后转化率保持较低但恒定。毛细管中甲烷和熔融金属的段塞流使人们能够延长热解停留时间，如果熔融金属在毛细管壁上形成连续的薄液膜，则可以避免碳沉积和逆反应问题。研究表明，使用内径为 2 mm 的石英玻璃毛细管，其中含有熔融锡和氮气，表观速度为 0.092 m s−1，表明在毛细管反应器中使用熔融金属是可控且可行的。在 1100 °C 和 0.122 m s−1 的表观速度下对甲烷进行的初步实验表明，甲烷可以分解，平均转化率为 32%，并且没有碳沉积。
The reserves of fossil energy sources can meet the global energy demands for years to come, but their utilisation is constrained by environmental considerations. Hydrogen can be generated from fossil fuels like methane without CO2emissions by pyrolysis at temperatures above 600 °C.In the fluid wall flow reactor concept, the heating gas is introduced through a porous reactor wall. Using a ceramic membrane with 3 μm pore diameter and helium as heating gas proved the best choice for long-term experimentation. The influence of methane diffusion into the outer heating chamber was studied and explains the decrease in conversion from 53% to 7% over 7 h, after which the conversion remains low but constant.The slug flow of methane and molten metal in a capillary enables one to extend the pyrolysis residence time and, if the molten metal forms a contiguous thin liquid film on the capillary wall, to avoid problems with carbon deposition and reverse reaction. The studies presented, using a 2 mm ID quartz glass capillary with molten tin and nitrogen and a superficial velocity of 0.092 m s−1, demonstrate that the use of molten metal in the capillary reactor is both controllable and feasible. Initial experiments with methane at 1100 °C and a superficial velocity of 0.122 m s−1show that methane can be decomposed with an average conversion of 32% and without carbon depositions.