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RISS 인기검색어
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- 저자 : Ali Reza Miroliaei (검색결과 2 건)
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Comparison of CFD results and experimental data in a fixed bed Fischer–Tropsch synthesis reactor
Ali Reza Miroliaei,Hossein Atashi,Ramin Karimzadeh,Farhad Shahraki 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.6
Hydrogenation of carbon monoxide in a fixed bed Fischer–Tropsch reactor has been simulated using computational fluid dynamics. The geometry of fixed bed reactor was modeled using the discrete packing method. The effects of reaction temperature, feed flow rate and H2/CO ratio on CO conversion and product selectivity were investigated. The mass fraction of products was also predicted by using the CFD model at different H2/CO ratios. It was observed that the CO conversion increased with increasing temperature,while decreased with increasing mass flow rate. The selectivity and mass fraction of products also increased with increasing temperature and H2/CO ratio.
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Ali Reza Miroliaei,Farhad Shahraki,Hossein Atashi 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.6
Fixed bed reactors are among the most important equipment in chemical industries as these are used in chemical processes. An accurate insight into the fluid flow in these reactors is necessary for their modeling. The pressure drop and heat transfer coefficient have been studied for the fixed bed reactor with tube to particle diameter ratio (N) of 4.6 and comprising 130 spherical particles using computational fluid dynamics (CFD). The simulations were carried out in a wide range of Reynolds number: 3.85≤Re≤611.79. The RNG k-ε turbulence model was used in the turbulent regime. The CFD results were compared with empirical correlations in the literature. The predicted pressure drop values in laminar flow were overestimated compared with the Ergun’s [27] correlation and underestimated in the turbulent regime due to the wall friction and the flow channeling in the bed, respectively. It was observed that the CFD results of the pressure drop are in good agreement with the correlations of Zhavoronkov et al. [28] and Reichelt [29]because the wall effects have been taken into account in these correlations. Values of the predicted dimensionless heat transfer coefficient showed better agreement with the Dixon and Labua’s [32] correlation. This is explained by the fact that this correlation is a function of the particle size and shape in the bed.
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