Radiation model of a TiO2-coated, quartz wool, packed-bed photocatalytic reactor

AIChE Journal ◽  
2009 ◽  
pp. n/a-n/a ◽  
Author(s):  
G. E. Imoberdorf ◽  
G. Vella ◽  
A. Sclafani ◽  
L. Rizzuti ◽  
O. M. Alfano ◽  
...  
Keyword(s):  
Packed Bed ◽  
Radiation Model ◽  
Photocatalytic Reactor ◽  
Quartz Wool

Modeling of a TiO2-coated quartz wool packed bed photocatalytic reactor

2010 ◽  
Vol 96 (3-4) ◽  
pp. 399-407 ◽  
Author(s):  
G. Vella ◽  
G.E. Imoberdorf ◽  
A. Sclafani ◽  
A.E. Cassano ◽  
O.M. Alfano ◽  
...  
Keyword(s):  
Packed Bed ◽  
Photocatalytic Reactor ◽  
Quartz Wool

Preliminary analysis of a tellerette packed-bed photocatalytic reactor

2002 ◽  
Vol 6 (4) ◽  
pp. 411-418 ◽  
Author(s):  
Mehrab Mehrvar ◽  
William A. Anderson ◽  
Murray Moo-Young
Keyword(s):  
Preliminary Analysis ◽  
Packed Bed ◽  
Photocatalytic Reactor

Performance of a Bench-Scale Annular-Type Packed-Bed Photocatalytic Reactor for Decomposition of Indigo Carmine Dissolved in Water

2009 ◽  
Vol 42 (7) ◽  
pp. 502-507 ◽  
Author(s):  
Yoshinori Hama ◽  
Masakazu Itamochi ◽  
Toshihide Horikawa ◽  
Masahiro Katoh ◽  
Tahei Tomida
Keyword(s):  
Indigo Carmine ◽  
Packed Bed ◽  
Photocatalytic Reactor ◽  
Bench Scale

scholarly journals A continuous flow packed bed photocatalytic reactor for the destruction of 2-methylisoborneol and geosmin utilising pelletised TiO2

2014 ◽  
Vol 235 ◽  
pp. 293-298 ◽  
Author(s):  
Carlos J. Pestana ◽  
Peter K.J. Robertson ◽  
Christine Edwards ◽  
Willem Wilhelm ◽  
Craig McKenzie ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Packed Bed ◽  
Photocatalytic Reactor

Analysis of Clumped-Pebble Shape on Thermal Radiation and Conduction in Nuclear Beds by Subcell Radiation Model

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Hao Wu ◽  
Nan Gui ◽  
Xingtuan Yang ◽  
Jiyuan Tu ◽  
Shengyao Jiang
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Thermal Radiation ◽  
Packed Bed ◽  
Radiation Model ◽  
The Core ◽  
Model Combining ◽  
Temperature Ranges ◽  
Pebble Flow ◽  
Good Agreement

Abstract The core of high-temperature gas-cooled reactor is a dense pebble bed of random packing filled with monosized fuel spheres. Subcell radiation model (SCM) is a generic analytical approach to calculate effective thermal conductivity (ETC) of thermal radiation. For the packed bed of monosized spheres operated in various conditions, it is proven that the SCM is still applicable in the particle size ranges of 1.2–60 mm and temperature ranges of 0–1200 °C. Based on the SCM, radiation-to-conduction ratio ξ is presented and radiation becomes an essential part at ξ>0.1 for the accurate evaluation. For the beds of nonoverlapping clumped-sphere particles, the model combining with discrete element method (DEM) and SCM is presented to study the heat transfer behaviors, including effects of particle shape, emissivity distribution and pebble flow with transient heat transfer. For the experimental nuclear pebble beds, the results of SCM are in good agreement with the empirical correlation and accord well with the experimental data under high temperature range.

Characterisation of multilayer materials using a position-sensitive atom probe

1990 ◽  
Vol 48 (4) ◽  
pp. 624-625
Author(s):  
RAD Mackenzie ◽  
G D W Smith ◽  
A. Cerezo ◽  
J A Liddle ◽  
CRM Grovenor ◽  
...  
Keyword(s):  
Quantum Well ◽  
Quantum Wells ◽  
Spatial Information ◽  
Chemical Vapour ◽  
Atom Probe ◽  
Organic Chemical ◽  
Growth Stages ◽  
Multiple Quantum ◽  
Quartz Wool ◽  
Position Sensitive

The position sensitive atom probe (POSAP), described briefly elsewhere in these proceedings, permits both chemical and spatial information in three dimensions to be recorded from a small volume of material. This technique is particularly applicable to situations where there are fine scale variations in composition present in the material under investigation. We report the application of the POSAP to the characterisation of semiconductor multiple quantum wells and metallic multilayers.The application of devices prepared from quantum well materials depends on the ability to accurately control both the quantum well composition and the quality of the interfaces between the well and barrier layers. A series of metal organic chemical vapour deposition (MOCVD) grown GaInAs-InP quantum wells were examined after being prepared under three different growth conditions. These samples were observed using the POSAP in order to study both the composition of the wells and the interface morphology. The first set of wells examined were prepared in a conventional reactor to which a quartz wool baffle had been added to promote gas intermixing. The effect of this was to hold a volume of gas within the chamber between growth stages, leading to a structure where the wells had a composition of GalnAsP lattice matched to the InP barriers, and where the interfaces were very indistinct. A POSAP image showing a well in this sample is shown in figure 1. The second set of wells were grown in the same reactor but with the quartz wool baffle removed. This set of wells were much better defined, as can be seen in figure 2, and the wells were much closer to the intended composition, but still with measurable levels of phosphorus. The final set of wells examined were prepared in a reactor where the design had the effect of minimizing the recirculating volume of gas. In this case there was again further improvement in the well quality. It also appears that the left hand side of the well in figure 2 is more abrupt than the right hand side, indicating that the switchover at this interface from barrier to well growth is more abrupt than the switchover at the other interface.

Managing total reduced sulfur emissions at a Canadian kraft pulp mill

TAPPI Journal ◽  
2016 ◽  
Vol 15 (4) ◽  
pp. 265-272 ◽  
Author(s):  
ROHAN BANDEKAR ◽  
JIM FREDERICK ◽  
JAROSLAV STAVIK
Keyword(s):  
Direct Contact ◽  
Black Liquor ◽  
Pulp Mill ◽  
Packed Bed ◽  
Average Value ◽  
Emission Limit ◽  
Total Reduced Sulfur ◽  
Reduced Sulfur ◽  
Air Ingress ◽  
Solids Content

This study addresses the challenges a dissolving-grade pulp mill in Canada faced in 2014 in meeting its total reduced sulfur (TRS) gas emission limit. These emissions from the recovery boiler exit are controlled by passing the boiler exit gas through a TRS scrubber system. The mill employs a cyclonic direct contact evaporator to concentrate black liquor to firing solids content. The off-gases from the direct contact evaporator flow to the effluent gas control system that consists of a venturi scrubber, a packed bed scrubber, and a heat recovery unit. Emissions of TRS greater than the regulated limit of 15 ppm were observed for a 4-month period in 2014. The level of emissions measured during this period was significantly higher than about 12 ppm, the expected average value based on historic experience. The problem persisted from mid-June 2014 until the annual mill shutdown in October 2014. The main TRS components detected and the performance of the Teller scrubber in capturing them are examined. Other potential causes for these emissions are identified, including mechanical problems such as broken packing in the TRS packed bed scrubber, broken baffle plates in the scrubber, and cyclone evaporator leaks causing air ingress. Repairs were carried out during the mill shutdown, which eliminated the TRS emissions problem.

Modified Effectiveness Model for Crossflow Packed-Bed Humidifiers

2019 ◽  
Vol 5 (1) ◽  
pp. 27-33
Author(s):  
Mostafa Sharqawy ◽  
◽  
Robert Zinni
Keyword(s):  
Packed Bed ◽  
Effectiveness Model
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