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catalyst-regeneration
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Naphtha Continuos Catalytic Reforming Optimization
, M.Sc. Thesis Sharif University of Technology ; Farhadi, Fathollah (Supervisor)
Abstract
Catalytic Reforming is a chemical process to convert naphtha feed stock into aromatic hydrocarbons and high-octane products. This process firstly was used in 1940s and since then has been considering as one the main units in oil refineries. It involves several complicated reactions which occur at high temperature and pressure in three or four series of reactors. There are various technologies for regeneration of the catalysts. The latest technology for this process is continuous catalytic regeneration.
The aim of this study was to optimize the catalytic reforming process by minimizing the deposited coke on catalyst surface and maximizing the octane number. To reach this aim, the...
The aim of this study was to optimize the catalytic reforming process by minimizing the deposited coke on catalyst surface and maximizing the octane number. To reach this aim, the...
Investigation of DPF-CRT Performance in Relation with Diesel Fuel Sulfur Content
, M.Sc. Thesis Sharif University of Technology ; Hosseini, Vahid (Supervisor)
Abstract
Iran’s big cities air pollution is one of the major challenges to authorities in view of public health. Tehran City has been facing more and more air quality problems over the last decade. The criteria pollutants in Tehran are PM2.5, PM10. Particulates and especially ultrafine particles have been identified as the most toxic component of the polluting mixture. Considering diesel engine operation concepts, these types of engines are one of the main source emission of ultrafine particles, with more than 58%, in Tehran. So controlling particulates emitted from these sources, is one of the first steps to improve air quality. Diesel Particulate Filters (DPFs) are well-known and effective way to...
Optimized midterm preventive maintenance outage scheduling of thermal generating units
, Article IEEE Transactions on Power Systems ; Vol. 27, issue. 3 , 2012 , p. 1354-1365 ; ISSN: 08858950 ; Fotuhi-Firuzabad, M ; Parvania, M ; Sharif University of Technology
Abstract
This paper addresses the midterm preventive maintenance outage scheduling problem of thermal generating units which is becoming increasingly important due to the aging of power generation fleet. In this context, a novel midterm preventive maintenance outage scheduler is proposed based on decision tree and mixed integer linear formation which explicitly considers the thermal units aging momentum in terms of failure rate. This allows the system operators to determine the thermal units' maintenance outage window based on the cost/benefit analysis of preventive maintenance tasks while optimizing the time interval between consecutive maintenance tasks. Additionally, the division of the year-long...
Optimized midterm preventive maintenance outage scheduling of thermal generating units
, Article IEEE Transactions on Power Systems ; Volume 27, Issue 3 , 2012 , Pages 1354-1365 ; 08858950 (ISSN) ; Fotuhi Firuzabad, M ; Parvania, M ; Sharif University of Technology
2012
Abstract
This paper addresses the midterm preventive maintenance outage scheduling problem of thermal generating units which is becoming increasingly important due to the aging of power generation fleet. In this context, a novel midterm preventive maintenance outage scheduler is proposed based on decision tree and mixed integer linear formation which explicitly considers the thermal units aging momentum in terms of failure rate. This allows the system operators to determine the thermal units' maintenance outage window based on the cost/benefit analysis of preventive maintenance tasks while optimizing the time interval between consecutive maintenance tasks. Additionally, the division of the year-long...
CFD simulation of gas–solid flow patterns in a downscaled combustor-style FCC regenerator
, Article Particuology ; Volume 39 , 2018 , Pages 96-108 ; 16742001 (ISSN) ; Behjat, Y ; Safekordi, A. A ; Sharif University of Technology
Elsevier B.V
2018
Abstract
To investigate the gas–solid flow pattern of a combustor-style fluid catalytic cracking regenerator, a laboratory-scale regenerator was designed. In scaling down from an actual regenerator, large-diameter hydrodynamic effects were taken into consideration. These considerations are the novelties of the present study. Applying the Eulerian–Eulerian approach, a three-dimensional computational fluid dynamics (CFD) model of the regenerator was developed. Using this model, various aspects of the hydrodynamic behavior that are potentially effective in catalyst regeneration were investigated. The CFD simulation results show that at various sections the gas–solid flow patterns exhibit different...
Long-term deactivation of a commercial CoMo-Al2O3 catalyst in hydrodesulfurization of a naphtha stream
, Article Industrial and Engineering Chemistry Research ; Volume 48, Issue 7 , 2009 , Pages 3331-3340 ; 08885885 (ISSN) ; Hoseini, M ; Sharif University of Technology
2009
Abstract
Long-term deactivation of a commercial CoMoγ-Al2O3 catalyst used in the hydrodesulfurization of a naphtha stream was studied using 35 months of operating data of an industrial HDS fixed bed reactor. The major sulfur-containing species of the naphtha feed was identified as 2-ethyl-4-methylthiophene (2E4MT) based on GC-MS analysis. The characterization of the industrial catalysts was performed by BET, XRD, XRF, and HCN Leco analyses. The reaction rate constant of the gas-phase hydrodesulfurization reaction was calculated by fitting the industrial reactor conversion data to the Hougen-Watson rate equation, assuming that the surface reaction between the sulfur-containing species and adsorbed...