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Ghauri M.,COMSATS Institute of Information Technology | Shahzad K.,University of Punjab | Inayat A.,University of Sharjah | Ali Z.,University of Engineering and Technology Lahore | And 3 more authors.
Energies | Year: 2016

The ambient temperature high pressure oxydesulphurisation technique was investigated to reduce the sulphur content. Prince of Wales coal was chosen for this study. The focus of the study was to investigate the reduction of both pyritic and organic sulphur while changing the KMnO4/Coal ratio, agitation speed, agitator configuration, and shear. The effect of different concentrations of acetone as a solvent and effect of particle size on the sulphur removal was also studied by a series of experimental runs at ambient temperature. Heating value recovery was found to be increased with the decreased KMnO4/Coal ratio and with decreased acetone concentration. It was found that sulphur removal was enhanced with the increase in shear using a turbine impeller. The effect of particle size was more significant on the pyritic sulphur removal as compared to the organic sulphur removal while heating value recovery was found to increase with decreased desulphurization tome for both, under atmospheric and high pressure. © 2016 by the authors; licensee MDPI. Source

Saleem M.,University of Punjab | Saleem M.,University of Graz | Tahir M.S.,NFC Institute of Engineering and Fertilizer Research | Krammer G.,Andritz AG
Chemical Engineering and Technology | Year: 2012

The axial velocity in two different tests with pulse-jet bag filters made of needle felts on a pilot-scale test facility separating limestone dust from air under ambient conditions is measured and simulated at different cake area loads. Results reveal that the axial velocity profiles are not truly linear along the whole length of the bag. A nonuniform gas flow prevails when the bags are differently dust-loaded. The same behaviors are observed even at the end of filtration cycles at different upper pressure drop limits. At the higher upper limit, the nonuniformity is stronger. Radial velocity profiles are nearly symmetric along the length of the bag. The axial and radial velocity profiles in a filter bag have been experimentally measured under different loading conditions to verify the hypothesis that the local velocity through the filter elements depends on dust loading. The axial velocity is also modeled using a simple approach and compared to the experimental results. The actual velocity profile depends on the cake area load on the object bag as well as on its neighbors. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Siebenhofer M.,Graz University of Technology | Tahir M.S.,Graz University of Technology | Tahir M.S.,NFC Institute of Engineering and Fertilizer Research | Letonja P.,Graz University of Technology | And 2 more authors.
AIChE Annual Meeting, Conference Proceedings | Year: 2010

Advanced wastewater treatment, overwhelmingly based on photochemical, photocatalytical, electrochemical processes and combinations of electrochemical and photochemical measures, is an expensive technique still. The main reason for the high cost of operation is caused by the low concentration of target constituents on the one hand and, on the other hand operation efficiency expressed in terms of specific overall energy demand is low due to low current efficiency as well as low radiation efficiency of photochemical processes. Fouling of electrodes and radiation sources is a significant obstacle preventing these processes from general application. With these disadvantages of state of the art treatment processes in mind wastewater treatment by corona discharge is a very promising technical measure because discharge area and target effluent are separated through a gaseous gap and fouling of the electron emission source is avoided. This project investigates the design parameters of corona discharge facilities with consideration of the effect of the design of discharge electrodes and the effect of flow conditions on the current/ voltage characteristics as well as pollutant degradation. Several discharge electrodes were investigated. The current/voltage characteristics derived from experiments have been modeled. Discharge electrodes of optimized shape generate significantly higher corona discharge currents compared with wire type electrodes with a positive effect on degradation of pollutants. Yield of ozone formation can easily be adjusted to individual needs according to a widely adjustable operation range between corona onset and corona break through voltage. Source

Zafar M.S.,University of Engineering and Technology Lahore | Zafar M.S.,The University of Faisalabad | Tausif M.,University of Engineering and Technology Lahore | Mohsin M.,University of Engineering and Technology Lahore | And 2 more authors.
Water, Air, and Soil Pollution | Year: 2015

Wastewater from textile industry contains a number of pollutants which are hazardous in nature. The direct discharge of the wastewater into the environment affects its ecological status by causing various undesirable changes. As environmental fortification becomes a global anxiety, industries are finding novel solutions for mounting low-cost and environmental-friendly technologies for the dye removal from the waste. The presence of the dyes hinders sunlight penetration and disturbs the ecosystem of water. However, the treatment of wastewater with biodegradable polymer attains a vital importance as they are environmental friendly. The main objective of the work was to make an effort to develop a feasible process for the removal of dyes/color from the textile wastewater by using potato starch, which is a plant-based bio-polymer. A three-level, full-factorial design was selected, and experiments were conducted using a jar test apparatus. The main effects and interactions of dosage, pH, and temperature on the percentage color removal were analyzed. Reduction in color was analyzed using UV-2800 spectrophotometer. A three-way significant interaction was observed. However, dosage is found to be the most important parameter for dye removal using potato starch. © 2015 Springer International Publishing Switzerland. Source

Suleman Tahir M.,University of Graz | Suleman Tahir M.,NFC Institute of Engineering and Fertilizer Research | Saleem M.,University of Punjab | Siebenhofer M.,University of Graz
Journal of Electrostatics | Year: 2012

This project presents the results of investigation of current/voltage characteristics of brush type discharge electrodes (BTDE) in tube type electrostatic precipitators and the effect on operation. Experimental investigations were conducted with discharge electrodes of different wire diameter and different brush diameter. The effect of electrode geometry on current/voltage behavior was recorded. Corona current with brush type discharge electrodes was modeled and compared with experimental data. Brush type discharge electrodes produce an enhanced corona current compared with wire type discharge electrodes. Limited enhanced corona has improving effect on collection efficiency. An adjusted correlation was therefore deduced from experimentally obtained current/voltage data with BTDE. © 2011 Elsevier B.V. Source

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