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- 저자 : Gangling Chen (검색결과 3 건)
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He Min,Chen Yueyao,Wu Zhen,Hou Gangling,Wang Jialong,Li Zhuangfei,Wang Yuzhu,Li Hanze 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.8
Steel containment vessels for nuclear power plants can experience gas leakage due to minute defects such as cracks, corrosion, and aging, leading to gas leakage. A gas leakage model for microchannels is established to elucidate the mechanism underlying gas leakage within microchannels caused by these defects, specifically addressing the issue of unidirectional gas flow. Computational Fluid Dynamics (CFD) and the UK R6 method are employed to calculate the gas leakage rate within microchannels. Furthermore, the characteristics of gas flow within microchannels are explored, including the factors affecting the gas leakage rate. Validation of the calculation results is verified experimentally. The results indicate that the gas mass flow rate exhibits a linear decrease with decreasing internal pressure and a non-linear decline as temperature increases. Additionally, the gas mass flow rate demonstrates a negative correlation with the microchannel length but a positive association to its hydraulic diameter. The primary influencing factors on gas leakage rates are hierarchically ranked as follows: pressure difference, microchannel cross-sectional area, temperature, microchannel length, and microchannel hydraulic diameter.
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Gas-phase dehydration of glycerol to acrolein over different metal phosphate catalysts
Tianlin Ma,Jianfei Ding,Xueli Liu,Gangling Chen,Jiandong Zheng 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.6
We conducted a comparative study of gas phase dehydration of glycerol to acrolein over aluminium phosphate, iron phosphate and nickel phosphate catalysts prepared by a simple replacement reaction method (AlP, FeP and NiP). The textural properties, acid amounts, acid types, and coke contents of the samples were studied. The results showed that all metal phosphate catalysts remained in an amorphous state. The glycerol conversion was proportional to the acid amount of metal phosphate catalyst in the glycerol dehydration reaction. Higher value of B/L was more likely to produce acrolein. Among the metal phosphate catalysts, FeP showed superior performance due to its suitable textural and acid properties. After 2 h on stream, high glycerol conversion (96%), acrolein selectivity (82%) and acrolein yield (79%) were achieved on the FeP catalyst at 280 oC. The catalyst deactivation was ascribed to carbon deposition on the catalyst surface blocking the active sites during the glycerol dehydration reaction.
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Tianlin Ma,Manyun Yin,Chunyang Su,Ningfei Guo,Xiangxiang Huang,Zhen Han,Yujie Wang,Gangling Chen,Zhi Yun 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
The surplus production of glycerol as a byproduct of biodiesel has become an urgent problem for the sustainabilityof the biodiesel industry. The catalytic transformation of glycerol to value-added chemicalshas attracted the attention of researchers worldwide over the last decade. Among them, selective dehydrationof glycerol to acrolein has gained interest from both academic researchers and industrial applications. Molecular sieves have been considered as the most promising catalysts for industrialapplications of glycerol dehydration. However, there is no systematic summary for the research carriedout for this reaction over molecular sieve catalysts. This work provides a comprehensive and criticalreview of glycerol dehydration to acrolein over molecular sieve catalysts, including ZSM-5, ZSM-11,MCM-22, MCM-41, SBA-15, SAPO-34, HY and Hb. The key technical problems that restrict its industrialapplication are the easy coking and poor stability of the molecular sieves. In particular, the pore size, porestructure, acid amount, acid strength, acid type and reaction conditions that influence the dehydrationperformance are discussed in detail. Furthermore, the reaction mechanism, reaction kinetics, reactionthermodynamics and future research directions for catalyst design and engineering are also presented. This review will deepen our understanding of the catalytic dehydration of glycerol to acrolein and provideguidance for researchers on the rational design of molecular sieve catalysts.
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