CFD simulations of Industrial Steam Cracking Reactors: Turbulence–Chemistry Interaction and Dynamic Zoning

2017 ◽  
Vol 56 (51) ◽  
pp. 14959-14971 ◽  
Author(s):  
Pieter A. Reyniers ◽  
Carl M. Schietekat ◽  
Bo Kong ◽  
Alberto Passalacqua ◽  
Kevin M. Van Geem ◽  
...  
Keyword(s):  
Cfd Simulations ◽  
Steam Cracking ◽  
Dynamic Zoning

Impact of radiation models in CFD simulations of steam cracking furnaces

2007 ◽  
Vol 31 (11) ◽  
pp. 1389-1406 ◽  
Author(s):  
A. Habibi ◽  
B. Merci ◽  
G.J. Heynderickx
Keyword(s):  
Cfd Simulations ◽  
Steam Cracking

CFD simulations of steam cracking furnaces using detailed combustion mechanisms

2006 ◽  
Vol 30 (4) ◽  
pp. 635-649 ◽  
Author(s):  
G.D. Stefanidis ◽  
B. Merci ◽  
G.J. Heynderickx ◽  
G.B. Marin
Keyword(s):  
Cfd Simulations ◽  
Steam Cracking

Evaluation of retrofitting of an industrial steam cracking furnace by means of CFD simulations

2019 ◽  
Vol 162 ◽  
pp. 114206 ◽  
Author(s):  
Jesús González Rebordinos ◽  
Carlos Herce ◽  
Ana González-Espinosa ◽  
Miguel Gil ◽  
Cristóbal Cortés ◽  
...  
Keyword(s):  
Cfd Simulations ◽  
Steam Cracking

Regioselective Gas-Phase n-Butane Transfer Dehydrogenation via Silica-Supported Pincer-Iridium Complexes

2020 ◽  
Author(s):  
Boris Sheludko ◽  
Cristina Castro ◽  
Chaitanya Khalap ◽  
Thomas Emge ◽  
Alan Goldman ◽  
...  
Keyword(s):  
Gas Phase ◽  
Active Site ◽  
Lower Cost ◽  
Open Systems ◽  
Iridium Complexes ◽  
Terminal Olefin ◽  
Molecular Precursors ◽  
Sterically Demanding ◽  
Olefin Production ◽  
Steam Cracking

<b>Abstract:</b> The production of olefins via on-purpose dehydrogenation of alkanes allows for a more efficient, selective and lower cost alternative to processes such as steam cracking. Silica-supported pincer-iridium complexes of the form [(≡SiO-<sup>R4</sup>POCOP)Ir(CO)] (<sup>R4</sup>POCOP = κ<sup>3</sup>-C<sub>6</sub>H<sub>3</sub>-2,6-(OPR<sub>2</sub>)<sub>2</sub>) are effective for acceptorless alkane dehydrogenation, and have been shown stable up to 300 °C. However, while solution-phase analogues of such species have demonstrated high regioselectivity for terminal olefin production under transfer dehydrogenation conditions at or below 240 °C, in open systems at 300 °C, regioselectivity under acceptorless dehydrogenation conditions is consistently low. In this work, complexes <a>[(≡SiO-<i><sup>t</sup></i><sup>Bu4</sup>POCOP)Ir(CO)] </a>(<b>1</b>) and [(≡SiO-<i><sup>i</sup></i><sup>Pr4</sup>PCP)Ir(CO)] (<b>2</b>) were synthesized via immobilization of molecular precursors. These complexes were used for gas-phase butane transfer dehydrogenation using increasingly sterically demanding olefins, resulting in observed selectivities of up to 77%. The results indicate that the active site is conserved upon immobilization.

Comparison of DSMC and CFD Models of Heat Transfer in a Rarefied Two-Dimensional Geometry

2018 ◽  
Author(s):  
Dilesh Maharjan ◽  
Mustafa Hadj-Nacer ◽  
Miles Greiner ◽  
Stefan K. Stefanov
Keyword(s):  
Heat Transfer ◽  
Rarefied Gas ◽  
Complex Geometry ◽  
Direct Simulation Monte Carlo ◽  
Accurate Method ◽  
Vacuum Drying ◽  
Helium Pressure ◽  
Two Dimensional ◽  
Dsmc Method ◽  
Cfd Simulations

During vacuum drying of used nuclear fuel (UNF) canisters, helium pressure is reduced to as low as 67 Pa to promote evaporation and removal of remaining water after draining process. At such low pressure, and considering the dimensions of the system, helium is mildly rarefied, which induces a thermal-resistance temperature-jump at gas–solid interfaces that contributes to the increase of cladding temperature. It is important to maintain the temperature of the cladding below roughly 400 °C to avoid radial hydride formation, which may cause cladding embrittlement during transportation and long-term storage. Direct Simulation Monte Carlo (DSMC) method is an accurate method to predict heat transfer and temperature under rarefied condition. However, it is not convenient for complex geometry like a UNF canister. Computational Fluid Dynamics (CFD) simulations are more convenient to apply but their accuracy for rarefied condition are not well established. This work seeks to validate the use of CFD simulations to model heat transfer through rarefied gas in simple two-dimensional geometry by comparing the results to the more accurate DSMC method. The geometry consists of a circular fuel rod centered inside a square cross-section enclosure filled with rarefied helium. The validated CFD model will be used later to accurately estimate the temperature of an UNF canister subjected to vacuum drying condition.

Effect of ring baffle configuration in a self-priming venturi scrubber using CFD simulations

Particuology ◽  
2019 ◽  
Vol 47 ◽  
pp. 63-69
Author(s):  
Shuai Yang ◽  
Xiangdi Zhao ◽  
Wanfu Sun ◽  
Jiwu Yuan ◽  
Zheng Wang
Keyword(s):  
Cfd Simulations ◽  
Venturi Scrubber

Feasibility of full-core pin resolved CFD simulations of small modular reactor with momentum sources

2021 ◽  
Vol 378 ◽  
pp. 111143
Author(s):  
Jun Fang ◽  
Dillon R. Shaver ◽  
Ananias Tomboulides ◽  
Misun Min ◽  
Paul Fischer ◽  
...  
Keyword(s):  
Cfd Simulations ◽  
Small Modular Reactor ◽  
Full Core
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