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    Radiative models for the furnace side of a bottom-fired reformer

    , Article Applied Thermal Engineering ; Volume 25, Issue 14-15 , 2005 , Pages 2398-2411 ; 13594311 (ISSN) Farhadi, F ; Bahrami Babaheidari, M ; Motamed Hashemi, M. M. Y ; Sharif University of Technology
    Two different groups of radiative models are used to simulate a Midrex reformer. The modeling includes the furnace-side as well as the reactor-side equations. The simultaneous solution of governing equations provides the flue gas and tube wall temperature profiles. These are compared with literature and plant data. It was observed that the Flux model, applied in this work on the furnace of a bottom-fired reformer, shows a good agreement with observed plant data. The well-stirred model is still satisfactory but the long-furnace model is far away to merit an attention. © 2005 Elsevier Ltd. All rights reserved  

    Optimization of ferrous biooxidation rate in a packed bed bioreactor using Taguchi approach

    , Article Chemical Engineering and Processing: Process Intensification ; Volume 46, Issue 10 , 2007 , Pages 935-940 ; 02552701 (ISSN) Mousavi, S. M ; Yaghmaei, S ; Jafari, A ; Vossoughi, M ; Ghobadi, Z ; Sharif University of Technology
    The biological oxidation of ferrous ion by iron-oxidizing bacteria is potentially a useful industrial process for removal of H2S from industrial gases, desulphurization of coal, removal of sulfur dioxide from flue gas, treatment of acid mine drainage and regeneration of an oxidant agent in hydrometallurgical leaching operations. The main purpose of this study was to find optimum values of the process parameters on the ferrous biooxidation rate by immobilization of a native Sulfobacillus species on the surface of low density polyethylene (LDPE) particles in a packed-bed bioreactor using Taguchi method. Five control factors, including temperature, initial pH of feed solution, dilution rate,... 

    Methane conversion to hydrogen and higher hydrocarbons by double pulsed glow discharge

    , Article Plasma Chemistry and Plasma Processing ; Volume 25, Issue 1 , 2005 , Pages 19-29 ; 02724324 (ISSN) Ghorbanzadeh, A. M ; Matin, N. S ; Sharif University of Technology
    Pulsed atmospheric glow plasma, sustained by corona discharge, was utilized to convert methane. Analysis by gas chromatography showed that hydrogen and C2-products are the main constituents of outlet mixture while C 2+-products with small concentrations were also detected. The chemical energy efficiency turned out to be about 9% for the best result obtained by this type of reactor. It has been shown that more improvement of energy efficiency is possible by increasing ' the pulse repetition rate  

    An optimization-oriented green design for methanol plants

    , Article Journal of Chemical Technology and Biotechnology ; Volume 87, Issue 8 , 2012 , Pages 1111-1120 ; 02682575 (ISSN) Taghdisian, H ; Farhadi, F ; Pishvaie, M. R ; Sharif University of Technology
    Wiley  2012
    Background: A new design for a methanol plant is proposed in which CO 2 addition, as one of the important parameters, is used to optimize the synthesis gas composition. An attempt has been made to assess the environmental features as well as the process operability of the proposed plant, in which the required CO 2 is provided from reformer flue gas. As a starting point, simulation of a conventional reference methanol case (RMC) and also the proposed green integrated methanol case (GIMC) are performed to obtain operational and kinetic parameters. In order to compare properly GIMC and RMC, the objective function is defined so that SynGas production, and thereby methanol production, in the GIMC... 

    Retrofitting a steam power cycle by using water from the interstage feed water pump as reheat spray

    , Article ASME Power Conference 2008, Lake Buena Vista, FL, 22 July 2008 through 24 July 2008 ; July , 2008 , Pages 23-30 ; 9780791848326 (ISBN) Saeedi, M. H ; Irani Rahaghi, A ; Mousavi, M. S ; Power Division, ASME ; Sharif University of Technology
    Various methods are used in thermal power plants to adjust the superheated or reheated steam temperature to a pre-determined set point, including flue gas recirculation, using tilting burners and spray of water from discharge of feed water pump, etc. In this paper, an innovative method is presented to control the reheater temperature by tapping water from an interstage of the feed water pump to control reheater temperature at the Bisotoun Power Plant (a steam cycle based power plant in the western Iran). The spray water for the superheaters is secured from the discharge of feed water pump, but interstage water, instead of gas recirculation or using tilting burner, is used to control the... 

    Economic feasibility of CO2 capture from oxy-fuel power plants considering enhanced oil recovery revenues

    , Article Energy Procedia, 19 September 2010 through 23 September 2010 ; Volume 4 , September , 2011 , Pages 1886-1892 ; 18766102 (ISSN) Khorshidi, Z ; Soltanieh, M ; Saboohia, Y ; Arab, M ; Sharif University of Technology
    Considering the dramatic increase of greenhouse gases concentration in the atmosphere, especially carbon dioxide, reduction of these gases seems necessary to combat global warming. Fossil fuel power plants are one of the main sources of CO2 emission and several methods are under development to capture CO2 from power plants. In this paper, CO2 capture from a natural gas fired steam cycle power plant using oxyfuel combustion technology is studied. Oxy-fuel combustion is an interesting option since CO2 concentration in the flue gas is highly increased. The Integrated Environmental Control Model (IECM) developed by Carnegie Mellon University (USA) is used to evaluate the effect of this capture...