scholarly journals Mathematical Modeling of Wet Magnesia Flue Gas Desulphurization Process

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
M. K. Mondal
Keyword(s):  
Liquid Film ◽  
Sulphur Dioxide ◽  
Enhancement Factor ◽  
Rational Design ◽  
Process Analysis ◽  
Flue Gases ◽  
Gaseous Species ◽  
Chemical Absorption ◽  
Enhancement Factors ◽  
Wet Scrubbing

Desulphurization of flue gases from various chemical industries in a techno-econo-enviro manner is a demanding technology. The concentrations of sulphur dioxide in and around these plants overshoot the danger point. In recent years, the process analysis of chemical absorption in a slurry has become important in rational design and development of wet scrubbing processes for the removal ofSO2from flue gases. The elementary steps encountered in wet scrubbing by slurries are diffusion and reaction of gaseous species and solid dissolution in liquid film. In the present work, the process of the absorption of sulphur dioxide into wet magnesia slurry was theoretically analyzed according to the two-reaction plane model incorporating the solid dissolution promoted by the reactions with absorbed sulphur dioxide in the liquid film. A model based on Fick's second law has been developed to calculate enhancement factor for absorption of Sulphur dioxide intoMg(OH)2slurry. The concentration of accumulated species in the bulk of the liquid phase (sulphite ions for this case) which substantially control the absorption rates was included in the model for the prediction of theoretical enhancement factor. The values of theoretical enhancement factors obtained from model were compared with experimental enhancement factors available in literature. The model values of enhancement factors agreed well with the values of experimental enhancement factor available in literature.

scholarly journals Process analysis for the carbon dioxide chemical absorption–regeneration system

2018 ◽  
Vol 215 ◽  
pp. 532-542 ◽  
Author(s):  
Claudio Madeddu ◽  
Massimiliano Errico ◽  
Roberto Baratti
Keyword(s):  
Carbon Dioxide ◽  
Process Analysis ◽  
Regeneration System ◽  
Chemical Absorption

Application of the Active Soda Process for Removing Sulphur Dioxide from Flue Gases

JAPCA ◽  
1989 ◽  
Vol 39 (9) ◽  
pp. 1206-1209 ◽  
Author(s):  
Emerich Erdös ◽  
Karel Mocek ◽  
Erich Lippert ◽  
Vêra Uchytilová ◽  
Lubomír Neuẑil ◽  
...  
Keyword(s):  
Sulphur Dioxide ◽  
Flue Gases

Removal of Sulphur Dioxide from Flue Gases

1999 ◽  
Vol 21 (7) ◽  
pp. 611-619 ◽  
Author(s):  
Aysegul Ersoy-Mericboyu
Keyword(s):  
Sulphur Dioxide ◽  
Flue Gases

scholarly journals Gas–Liquid Slug Flow Studies in Microreactors: Effect of Nanoparticle Addition on Flow Pattern and Pressure Drop

2022 ◽  
Vol 3 ◽  
Author(s):  
Jie Zong ◽  
Jun Yue
Keyword(s):  
Pressure Drop ◽  
Liquid Film ◽  
Flow Pattern ◽  
Slug Flow ◽  
Base Fluid ◽  
Rational Design ◽  
Colloidal Suspensions ◽  
Reynolds Numbers ◽  
Working Fluid ◽  
Nanoparticle Suspension

Colloidal suspensions of nanoparticles (e.g., metals and oxides) have been considered as a promising working fluid in microreactors for achieving significant process intensification. Existing examples include their uses in microflow as catalysts for enhancing the reaction efficiency, or as additives to mix with the base fluid (i.e., to form the so-called nanofluids) for heat/mass transfer intensification. Thus, hydrodynamic characterization of such suspension flow in microreactors is of high importance for a rational design and operation of the system. In this work, experiments have been conducted to investigate the flow pattern and pressure drop characteristics under slug flow between N2 gas and colloidal suspensions in the presence of TiO2 or Al2O3 nanoparticles through polytetrafluoroethylene (PTFE) capillary microreactors. The base fluid consisted of water or its mixture with ethylene glycol. The slug flow pattern with nanoparticle addition was characterized by the presence of a lubricating liquid film around N2 bubbles, in contrast to the absence of liquid film in the case of N2-water slug flow. This shows that the addition of nanoparticles has changed the wall wetting property to be more hydrophilic. Furthermore, the measured pressure drop under N2-nanoparticle suspension slug flow is well described by the model of Kreutzer et al. (AIChE J 51(9):2428–2440, 2005) at the mixture Reynolds numbers ca. above 100 and is better predicted by the model of Warnier et al. (Microfluidics and Nanofluidics 8(1):33–45, 2010) at lower Reynolds numbers given a better consideration of the effect of film thickness and bubble velocity under such conditions in the latter model. Therefore, the employed nanoparticle suspension can be considered as a stable and pseudo single phase with proper fluid properties (e.g., viscosity and density) when it comes to the pressure drop estimation.

scholarly journals Experimental investigation of the effect of wave turbulators on heat transfer in pipes

2021 ◽  
pp. 183-183
Author(s):  
Sendogan Karagoz ◽  
Semih Erzincanli ◽  
Orhan Yildirim ◽  
Ilker Firat ◽  
Mehmet Kaya ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Friction Factor ◽  
Enhancement Factor ◽  
Single Phase ◽  
Reynolds Numbers ◽  
Nusselt Numbers ◽  
Thermal Enhancement ◽  
Enhancement Factors ◽  
Thermal Enhancement Factor

This experimental study deals with the heat transfer and friction effects of sinusoidal part turbulators for single-phase flows occurring in a circular shaped pipe. Turbulators with three different radius values are placed in the pipe to make the flow turbulent. In this way, changes in Nusselt number and friction coefficient are examined. As a result of the experiments made with Reynolds numbers in the range of 6614-20710, the increase rates of the Nusselt numbers of turbulators with 20 mm, 110 mm and 220 mm radius compared to the empty pipe were obtained as 153.49%, 85.36%, and 52.09%, respectively. As a result of the decrease in the radius, there was an increase in the Nusselt number and the friction factor. Parallel to the Nusselt number, the highest friction factor was obtained in the smallest radius turbulator. It was found that the thermal enhancement factors of 110 mm and 220 mm radius turbulators increased by 179.54% and 132.95%, respectively, compared to the 20 mm radius turbulator. Similarly, it was determined that the thermal enhancement factor of the 110 mm radius turbulator increased by 20% compared to the 220 mm radius turbulator.

Wet Scrubbing of Sulfur Oxides from Flue Gases

1974 ◽  
pp. 135-151
Author(s):  
M. R. GOGINENI ◽  
W. C. TAYLOR ◽  
A. L. PLUMLEY ◽  
JAMES JONAKIN
Keyword(s):  
Flue Gases ◽  
Sulfur Oxides ◽  
Wet Scrubbing

Field Emission Site Densities of Nanostructured Carbon

2001 ◽  
Vol 675 ◽  
Author(s):  
J B Cui ◽  
J Robertson ◽  
W I Milne
Keyword(s):  
Field Emission ◽  
Applied Field ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Carbon Films ◽  
Vacuum Arc ◽  
Nanostructured Carbon ◽  
Field Emission Properties ◽  
Site Density ◽  
Enhancement Factors

ABSTRACTThe field emission properties of nanostructured carbon films deposited by cathodic vacuum arc in a He atmosphere have been studied by measuring the emission currents and the emission site density. The films have an onset field of ∼3 V/μm. The emission site density is viewed on a phosphor anode and it increases rapidly with applied field. It is assumed that the emission occurs from surface regions with a range of field enhancement factors but with a constant work function. The field enhancement factor is found to have an exponential distribution.

Molecular Thermodynamics of Supercritical Fluid Mixtures

1983 ◽  
Vol 22 ◽  
Author(s):  
Charles A. Eckert
Keyword(s):  
Supercritical Fluid ◽  
Hard Sphere ◽  
Rational Design ◽  
Equations Of State ◽  
Selective Absorption ◽  
Fluid Mixtures ◽  
Partial Molal Volumes ◽  
Enhancement Factors ◽  
Solute Interactions ◽  
Molal Volumes

ABSTRACTSupercritical fluid extraction uses a dense gas as a solvent at a temperature only slightly above its critical temperature and a pressure of a few hundred bars. The process offers the advantages of both conventional distillation and solvent extraction, and permits the facile achievement of difficult separations by highly selective absorption and desorption of various solutes. A valid thermodynamic model is essential for the rational design of such processes. We have made extensive solubility measurements at pressures to about half a kilobar, and we interpret the results in terms of perturbed hard-sphere equations of state. In this, we characterize solution nonidealities in terms of enhancement factors, which are often in the range of 103−108. Even better information about the specific solvent-solute interactions are available from measurements of partial molal volumes in supercritical solutions. These are very difficult measurements, as the effects are most pronounced precisely where the solvent compressibility is greatest, and accurate data are possible only because of the advent of the high-pressure vibrating tube densitometer, which converts density determinations to highly accurate frequency measurements for determinations to a precision of ±0.0001 g/cc. The solute partial molal volumes are many liters negative in the critical region, and these data are interpreted in terms of various equations of state.

Sign in / Sign up

Export Citation Format

Share Document