Experimental Study of the Influence of Process Conditions on Tubular Reactor Performance

2016 ◽  
pp. 17-25
Author(s):  
M.K. Mesfer ◽  
M. Danish
Keyword(s):  
Experimental Study ◽  
Tubular Reactor ◽  
Process Conditions ◽  
Reactor Performance

Heat Transfer Modeling in a Counter-Current Moving-Bed Tubular Reactor for High-Temperature Thermochemical Energy Storage

2021 ◽  
Author(s):  
Wei Huang ◽  
Eric Million ◽  
Kelvin Randhir ◽  
Joerg Petrasch ◽  
James Klausner ◽  
...  
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Tubular Reactor ◽  
Operating Conditions ◽  
Transfer Model ◽  
Reactor Performance ◽  
Low Oxygen ◽  
Moving Bed ◽  
Oxidation Reactor ◽  
Counter Current

Abstract An axisymmetric model coupling counter-current gas-solid flow, heat transfer, and thermochemical redox reactions in a moving-bed tubular reactor was developed. The counter-current flow enhances convective heat transfer and a low oxygen partial pressure environment is maintained for thermal reduction within the reaction zone by using oxygen depleted inlet gas. A similar concept can be used for the oxidation reactor which releases high-temperature heat that can be used for power generation or as process heat. The heat transfer model was validated with published results for packed bed reactors. After validation, the model was applied to simulate the moving-bed reactor performance, through which the effects of the main geometric parameters and operating conditions were studied to provide guidance for lab-scale reactor fabrication and testing.

scholarly journals 3-D Multi-Tubular Reactor Model Development for the Oxidative Dehydrogenation of Butene to 1,3-Butadiene

2020 ◽  
Vol 4 (3) ◽  
pp. 46 ◽  
Author(s):  
Jiyoung Moon ◽  
Dela Quarme Gbadago ◽  
Sungwon Hwang
Keyword(s):  
Oxidative Dehydrogenation ◽  
Model Development ◽  
Tubular Reactor ◽  
Maximum Error ◽  
Coolant Fluid ◽  
Reactor Performance ◽  
Reactor Model ◽  
Catalytic Reactors ◽  
Thermodynamic Conditions ◽  
Scale Design

The oxidative dehydrogenation (ODH) of butene has been recently developed as a viable alternative for the synthesis of 1,3-butadiene due to its advantages over other conventional methods. Various catalytic reactors for this process have been previously studied, albeit with a focus on lab-scale design. In this study, a multi-tubular reactor model for the butadiene synthesis via ODH of butene was developed using computational fluid dynamics (CFD). For this, the 3D multi-tubular model, which combines complex reaction kinetics with a shell-side coolant fluid over a series of individual reactor tubes, was generated using OpenFOAM®. Then, the developed model was validated and analyzed with the experimental results, which gave a maximum error of 7.5%. Finally, parametric studies were conducted to evaluate the effect of thermodynamic conditions (isothermal, non-isothermal and adiabatic), feed temperature, and gas velocity on reactor performance. The results showed the formation of a hotspot at the reactor exit, which necessitates an efficient temperature control at that section of the reactor. It was also found that as the temperature increased, the conversion and yield increased whilst the selectivity decreased. The converse was found for increasing velocities.

Experimental study of bump void formation according to process conditions

2013 ◽  
Vol 53 (4) ◽  
pp. 638-644 ◽  
Author(s):  
Seong-Hun Na ◽  
Seung-Kyu Lim ◽  
Jin-Soo Kim ◽  
Hwa-Sun Park ◽  
Heung-Jae Oh ◽  
...  
Keyword(s):  
Experimental Study ◽  
Void Formation ◽  
Process Conditions

Theoretical and experimental study of the photocatalytic activity of ZnO coated tubular reactor

2014 ◽  
Vol 179 ◽  
pp. 41-47 ◽  
Author(s):  
E. Ríos-Valdovinos ◽  
P. Amézaga-Madrid ◽  
W. Antúnez-Flores ◽  
F. Pola-Albores ◽  
P. Pizá-Ruiz ◽  
...  
Keyword(s):  
Experimental Study ◽  
Photocatalytic Activity ◽  
Tubular Reactor

An Experimental Study on Diamond Cutting of Optical Glass

2008 ◽  
Vol 375-376 ◽  
pp. 211-215 ◽  
Author(s):  
Hang Zhao ◽  
Ming Zhou
Keyword(s):  
Experimental Study ◽  
Tool Wear ◽  
Ultrasonic Vibration ◽  
Optical Glass ◽  
High Hardness ◽  
Optical Quality ◽  
Process Conditions ◽  
Machined Surface ◽  
Ductile Mode ◽  
Indentation Analysis

Optical glass is one of the most difficult-to-cut brittle materials due to its high brittleness and high hardness. In this work, an experimental study was conducted to diamond-cut glass SF6 in ductile mode. Nano-indentation analysis was performed for understanding the material deformation behavior in practical cutting process. The effect of process conditions, i.e. conventional turning and ultrasonic vibration assisted cutting, on the tool wear and surface quality was discussed based on the observations of the tool wear zone microstructure and the machined surface topography. The investigation presents the feasibility of achieving optical quality surfaces on glass with the application of ultrasonic vibration cutting technology. The tool life and surface finish were improved significantly by applying ultrasonic vibration to the cutting tool.

scholarly journals Experimental Study of Heavy Oil Recovery Mechanisms during Cyclic Solvent Injection Processes

SPE Journal ◽  
2020 ◽  
pp. 1-16
Author(s):  
Maria Plata ◽  
Jonathan Bryan ◽  
Apostolos Kantzas
Keyword(s):  
Experimental Study ◽  
Primary Production ◽  
Oil Recovery ◽  
Heavy Oil ◽  
Process Conditions ◽  
Heavy Oil Recovery ◽  
Oil Saturation ◽  
Solvent Injection ◽  
Pressure Depletion ◽  
Multiple Cycles

Summary The cyclic solvent injection (CSI) process has recently shown to be a promising method for enhanced heavy oil recovery in Canada. Laboratory testing is often run before development of field pilots to assess the effect of parameters, such as solvent choice and process conditions, on the CSI response. However, differences between laboratory results vs. field applications have been observed. CSI laboratory studies work for only two to three cycles due to low incremental oil in subsequent cycles, whereas field pilots continue for years over multiple cycles. This experimental study is intended to capture the production mechanisms responsible for heavy oil production in CSI. Primary production and CSI tests were conducted using sandpack models saturated with live heavy oil of 9530 mPa·s viscosity. The experiments were conducted in horizontal and vertical mode injection at high- and low-pressure depletion rates using two solvent mixtures of CH4 and C3H8. The sandpacks were scanned after every cycle to analyze the evolution of gas and oil saturations using computed tomography (CT). Three cores were used to study the effect of several parameters: gravity forces, pressure depletion rate, solvent composition, and initial oil saturation on the performance of CSI processes. CSI cycles run after primary production in horizontal systems produced negligible incremental oil for both slow and fast drawdown rates due to the large void space and high free gas saturation inhibiting the pressure buildup to push the solvent-diluted oil. These CSI experiments were only initially successful in dead oil systems, in which the initial oil saturation was higher and appropriate pressure gradient was generated through fast depletion rates. During the vertical alignment, CSI cycles exhibited higher incremental oil recovery per cycle. Slow depletion cycles were more efficient in terms of pressure and incremental recovery per cycle; however, faster depletion cycles performed better as a function of time. These results are more in line with the repeated recoveries measured over multiple cycles in field CSI pilot studies. More volume of diluted oil was drained out of the core when the solvent mixture with higher propane (C3H8) content was injected. These results demonstrate the importance of gravity drainage in the CSI process and its significance on successful oil recovery rates. This study illustrates the limitations of previous horizontal laboratory tests and shows an improved test configuration for modeling and prediction of the improved response observed in CSI pilots.

scholarly journals Effect of compaction roller on layup quality and defects formation in automated fiber placement

2019 ◽  
Vol 39 (1-2) ◽  
pp. 3-20 ◽  
Author(s):  
Nima Bakhshi ◽  
Mehdi Hojjati
Keyword(s):  
Experimental Study ◽  
Finite Element ◽  
Pressure Distribution ◽  
Finite Element Simulations ◽  
Process Conditions ◽  
Fiber Placement ◽  
Static Testing ◽  
Contact Width ◽  
Automated Fiber Placement

Application of automated fiber placement is limited by defects formed in the prepreg tows during the layup process. An extensive experimental study is performed to investigate the effect of compaction roller on the quality of the layup. Five different compaction rollers with different stiffness and architectures were manufactured and employed to dispense prepreg tows at various process conditions. Layup quality was examined and different defects including tow buckling and blister were identified. In addition to automated fiber placement trials, static testing and finite element simulations were performed to probe the pressure distribution and contact width of each roller. This data was used to support and understand the results of the automated fiber placement trials. Results indicate the solid elastomer rollers that are compliant enough to produce the same level of contact width under similar levels of compaction forces are superior to the perforated rollers in terms of achievable layup quality.

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