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Insights into carbon formation over molten salt-promoted NiO/Al2O3 during methane pyrolysis
He Yangdong,Jing Xingsheng,Qin Li,Wang Dan,Wu Chen,Liu Mengying,Yang Mingkai,Huang Zeai 한국탄소학회 2024 Carbon Letters Vol.34 No.5
Pyrolysis of methane is a carbon-economic method to obtain valuable carbon materials and COx-free H2, under the carbon peaking and carbon neutrality goals. In this work, we propose a methane pyrolysis process to produce graphite and H2 using bubble column reactor containing NiO/Al2O3 and NaCl–KCl (molten salt). The process was optimized by the different amounts of NaCl–KCl, the CH4/Ar ratio and temperature, indicating that the CH4 conversation rate could reach 92% at 900 °C. Meanwhile, we found that the addition of molten salt could obtain pure carbon materials, even if the conversation rate of CH4 decreases. The analysis of the carbon products revealed that graphite could be obtained.
A Study on Adaptive Direction Teaching-Learning-Based Optimization Algorithm
Xu Sun,Mengying He,Leilei Kong,Haoliang Qi 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.4
In the real life learning process, the teacher communicates with the students for a better learning outcome. The teaching-learning-based optimization (TLBO) algorithm simulates this procedure and shows its great performance in solving the constrained and unconstrained nonlinear optimization problem. This paper presents an adaptive direction strategy(ADS )t o improve the searching ability for the TLBO algorithm. The improved algorithm is tested through searching the optimal points for a few typical testing functions. The testing result shows that the improved TLBO algorithm could obtain better optimal solutions in shorter time. Compared to the normal TLBO algorithm, the stability and effectiveness of the improved algorithm are increased greatly.
Wei Guo,Bo He,Huajie Mao,Mengying Zhang,Lin Hua,Zhenghua Meng 한국섬유공학회 2019 Fibers and polymers Vol.20 No.7
A combined in-mold decoration and microcellular foaming injection molding process (IMD/Mucell) is proposedto improve the surface quality of foamed parts. Through theoretical inference, the mathematical models of temperature field,velocity profile and forces on bubble were established with combining traditional mathematical models and the different heattransfer coefficient of the mold inner surface. The effects of the non-isothermal mold on the bubble structure and formingprocess of inter bubble were investigated with experiments and numerical simulation. Results showed that the criticalpressure of the cavity existed in the melt filling and bubble expanding stage, and it affected the cells structure obviously at thefilling stage. The lift force took the bubbles to the film side based on the velocity profile of viscous fluid, and maximal bubblewas closer to the transition layer with film due to higher temperature. In the combined process, the evolution rule ofsuperficial bubbles was analyzed, and results showed that the surface quality was improved in the film side.