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RISS 인기검색어
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- 저자 : Zhijian Tian (검색결과 2 건)
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Hydrothermal Synthesis of La-Mn-hexaaluminates for the Catalytic Combustion of Methane
Xu, Jinguang,Zhijian Tian,Wang, Junwei,Yunpeng Xu,Zhusheng Xu,Lin, Liwn 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.2
Hydrothermal synthesis by using urea hydrolysis at 1.0~3.0MPa and 120~130℃ was employed to prepare Mn-substituted hexaaluminate catalysts for methane combustion. The results from DTA-MS demonstrated that CO^2-_3 and OH^- anions co-exist in the hydrothermal reaction. XRD reveals that the components of carbonates of carbonates and hydroxides in the hydrothermal reaction are more favorable than those in the(NH_4)_2CO_3 co-precipitation for the formation of the Mn-substituted hexaaluminate phase. After calcination at 1,200℃ for 2h, LaMnAl_11O_19 is the major phase of the catalyst prepared by the hydrothermal synthesis method while LaAlO_3 is the major one of the catalysts prepared by NH_4OH and (NH_4)_2CO_3 co-precipitation. The catalyst prepared by hydrothermal synthesis has higher activity than that prepared by NH_4OH and (NH_4)CO_3 co-precipitation. The major reason is that more Mn^2+ ions have incorporated into the hexaaluminate lattice. The effect of drying methods on the formation of hexaaluminate phase was also discussed.
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Design and analysis of RIF scheme to improve the CFD efficiency of rod-type PWR core
Chen, Guangliang,Qian, Hao,Li, Lei,Yu, Yang,Zhang, Zhijian,Tian, Zhaofei,Li, Xiaochang Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.10
This research serves to advance the development of engineering computational fluid dynamics (CFD) computing efficiency for the analysis of pressurized water reactor (PWR) core using rod-type fuel assemblies with mixing vanes (one kind of typical PWR core). In this research, a CFD scheme based on the reconstruction of the initial fine flow field (RIF CFD scheme) is proposed and analyzed. The RIF scheme is based on the quantitative regulation of flow velocities in the rod-type PWR core and the principle that the CFD computing efficiency can be improved greatly by a perfect initialization. In this paper, it is discovered that the RIF scheme can significantly improve the computing efficiency of the CFD computation for the rod-type PWR core. Furthermore, the RIF scheme also can reduce the computing resources needed for effective data storage of the large fluid domain in a rod-type PWR core. Moreover, a flow-ranking RIF CFD scheme is also designed based on the ranking of the flow rate, which enhances the utilization of the flow field with a closed flow rate to reconstruct the fine flow field. The flow-ranking RIF CFD scheme also proved to be very effective in improving the CFD efficiency for the rod-type PWR core.
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