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Weiqiang Kong,Qiuwan Shen,Jiadong Liao,Ziheng Jiang,Naibao Huang,Guogang Yang,Shian Li 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.2
A three-dimensional numerical model of a methanol steam reforming micro-channel reactor for hydrogen production based onCu/ZnO/Al2O3 catalyst was established. The effects of different inlet mass flow rate, reaction temperature and steam to carbonratio (S/C) on the mass change of each component, chemical reaction rate and hydrogen production performance of microchannelreformer were studied. The results show that with the increase of inlet mass flow rate, the mass fraction of CH3OH atthe outlet of reforming channel increases gradually, and the methanol conversion rate decreases gradually. The mass fractionof CO at the outlet of reforming channel decreases gradually, and the CO selectivity decreases gradually. With the increase ofreaction temperature, the mass fraction of CH3OH at the outlet of reforming channel decreases gradually, and the methanolconversion rate increases. The mass fraction of CO at the outlet of reforming channel increases rapidly, and the CO selectivityincreases rapidly. With the increase of S/C, the methanol conversion rate increased and the CO selectivity decreased. In thisstudy, the influence of reaction conditions on methanol reformer was obtained, and the reasons behind it were clarified, whichprovided more valuable insights for the operating conditions of hydrogen production from MSR.
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Yang Guogang,Liao Jiadong,Shen Qiuwan,Li Shian,Jiang Ziheng,Wang Hao,Li Zheng,Zhang Guoling,Huang Naibao 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.7
Droplet purging in the gas diffusion layer (GDL) is the key to improving the performance of proton exchange membrane fuel cells (PEMFCs). Lattice Boltzmann method (LBM) is used to study the dynamic behavior of multiple droplets randomly distributed in the GDL under air purging. The GDL is randomly reconstructed. The effects of rib width, initial water content, contact angle and air velocity are studied. By analyzing the dynamic distribution of droplets in the GDL and the change of the remaining water content with time, it is found that the droplets are only a small amount under the rib and accumulated mostly on both sides of the GDL at stabilization, which is caused by the large velocity under the rib. The residual water content in the GDL increases with the increase of the initial water content, and decreases with the increase of the rib width, contact angle and air velocity. However, when the rib to channel width ratio exceeds 1, the improvement of purging effect is not obvious, the purging time increases significantly, and the increase of air velocity does not help much to remove the droplets accumulated on both sides of the GDL.
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Yang Guogang,Wang Hao,Su Fengmin,Li Shian,Zhang Guoling,Sun Juncai,Shen Qiuwan,Jiang Ziheng,Liao Jiadong,Chen Pengyu 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.7
Proton exchange nembrane fuel cells (PEMFCs) are highly promising energy devices for future transportation and distributed power stations. The electrochemical performance of PEMFCs assembled with gas diffusion layer (GDL) of different porosity gradient distributions has been analyzed using the lattice Boltzmann method. A single-phase multi-component lattice Boltzmann model employing the active approach was developed to investigate the reactive gas flow within the GDL. Two types of GDLs with the same porosity, namely multilayer porosity gradient GDLs and linear porosity gradient GDLs, were generated to investigate the effect of the porosity gradient of the GDL on the electrochemical performance of PEMFC. The results show that the two types of porosity gradient GDL improve oxygen starvation problems and enhance water management, and that the GDLs with smaller porosity gradients can increase the mean current density. This paper develops the study of pore-scale analysis of PEMFC performance and can provide guidance for the design of GDL structures.
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