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Numerical Simulation of Reacting Flow in Large Scale Heavy Fuel Oil Fired Furnaces to Control Temperature Field and NOx Emission
, M.Sc. Thesis Sharif University of Technology ; Darbandi, Masoud (Supervisor)
Abstract
Heavy fuel oil (HFO) is usually consumed in large scale furnaces, e.g., those of power plants. Experience shows that its combustion produces large amount of NOx emission. In present study, a large scale heavy fuel oil fired furnace is numerically simulated to investigate different possible solutions for NOx reduction. In this regard, a computational framework is firstly designed benefiting from the researches reported previously in literature. The results of this framework are then compared with available measurements to evaluate the accuracy of current designed computational framework. Second, the influences of a number of different controlling parameters are studied carefully to improve...
Modeling of Heavy Residual oil Conversion to Synthetic Gas
, M.Sc. Thesis Sharif University of Technology ; Badakhshan, Amir (Supervisor) ; khorashe, Farhad (Supervisor)
Abstract
According to global improving consumption of distillate products, like gasoline and diesel, reduction in light petroleum production and growth in exploring and extraction of heavy and sour petroleum, changing in refining structure of worldwide oil refineries is necessary and it is crucial to apply special processes for refining, conversion and cleaning of these heavy and extra-heavy petroleum. Gasification of these fuels, i.e. partial thermal oxidation of feed in the presence of gasifying agent (air, oxygen, steam or mixture of them) in the gasifier, is one of the new ways to convert heavy fuel oil to synthetic gas (syngas), that this gas can be used widely in downstream processes. Here,...
Laboratory Study on the Effect of Thermal Cracking of Heavy Oil
, M.Sc. Thesis Sharif University of Technology ; Bastani, Dariush (Supervisor) ; Seifkordi, Ali Akbar (Supervisor) ; Safavi, Mohammad Ali (Supervisor) ; Shafeghat, Amin (Co-Advisor)
Abstract
The Visbreaking process is one of the Residue upgrading method, which, in addition to the production of mid-distillate products, also reduces the viscosity of feed. By reducing the viscosity of the feed, the amount of cutter stock is reduced to produce fuel oil. Since the refiners want to achieve the maximum conversion in the visbreaker unit, it is necessary to estimate the proper operating conditions and distribution of the products. Increasing in conversion in a visbreaker unit will lead to a refinancing profit. In this work, four Vacuum Residual oil from Iranian Refineries were selected for studying on visbreaking process. Experiments were carried out at RIPI-Petroleum Refining Technology...
Oil Separation from Contaminated Condensates WithFuel in Power Plant by Flotation &Solvent Sublation
,
M.Sc. Thesis
Sharif University of Technology
;
shaygan, Jalaloddin
(Supervisor)
;
Jalali, Morteza
(Supervisor)
Abstract
Some of the thermal power plants use heavy fuel oil as an auxiliary fuel instead of the fuel gas, especially in the cold seasons. In these plants, in order to reduce fuel viscosity, heavy fuel oil is heated in several stages including fuel storage tank, connection lines and oil supply to burner by heat exchange with returned steam from the turbine, which can lead to fuel leakage into the condensates. This contamination is in addition to the contamination that has resulted from leaking seals on steam driven equipments, such as pumps and turbines. Reusing these contaminated condensates as boiler feed water can lead to coking of hydrocarbons and deposition of a hard scale on boiler tube walls....
Joint approximate diagonalization of eigenmatrices as a high-throughput approach for analysis of hyphenated and comprehensive two-dimensional gas chromatographic data
, Article Journal of Chromatography A ; Volume 1524 , 2017 , Pages 188-201 ; 00219673 (ISSN) ; Parastar, H ; Sharif University of Technology
Abstract
The objective of the present work is development of joint approximate diagonalization of eigenmatrices (JADE) as a member of independent component analysis (ICA) family, for the analysis of gas chromatography-mass spectrometry (GC–MS) and comprehensive two-dimensional gas chromatography-mass spectrometry (GC × GC–MS) data to address incomplete separation problem occurred during the analysis of complex sample matrices. In this regard, simulated GC–MS and GC × GC–MS data sets with different number of components, different degree of overlap and noise were evaluated. In the case of simultaneous analysis of multiple samples, column-wise augmentation for GC–MS and column-wise super-augmentation...
Novel type of four-impinging-jets reactor for Oxidative desulfurization of light fuel oils
, Article Industrial and Engineering Chemistry Research ; Volume 49, Issue 19 , 2010 , Pages 9339-9348 ; 08885885 (ISSN) ; Molaei Dehkordi, A ; Shahrokhi, M ; Ebrahimi, A. A ; Sharif University of Technology
Abstract
A novel type of four-impinging-jets reactor (FIJR) has been proposed and tested successfully for the oxidative desulfurization of kerosene as a typical light fuel oil. The FIJR is characterized by a high-intensity mixing chamber located at the bottom of the reactor and equipped with four impinging jets. The influences of various operating and design parameters such as feed flow rate, internozzle distance, jet diameter, and jet Reynolds number on the performance of the FIJR have been carefully investigated. As a result of both the impinging process and shear forces exerted on the phases, the rate of desulfurization in FIJR increased significantly compared to that obtained by a conventional...
Chemometrics-assisted effect-directed analysis of crude and refined oil using comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry
, Article Environmental Science and Technology ; Vol. 48, issue. 5 , 2014 , pp. 3074-3083 ; ISSN: 0013936X ; Thomas, K. V ; Parastar, H ; Diez, S ; Tauler, R ; Bayona, J. M ; Sharif University of Technology
Abstract
An effect-directed analysis (EDA) of fresh and artificially weathered (evaporated, photooxidized) samples of North Sea crude oil and residual heavy fuel oil is presented. Aliphatic, aromatic, and polar oil fractions were tested for the presence of aryl hydrocarbon receptor (AhR) agonist and androgen receptor (AR) antagonist, demonstrating for the first time the AR antagonist effects in the aromatic and, to a lesser extent, polar fractions. An extension of the typical EDA strategy to include an N-way partial least-squares (N-PLS) model capable of relating the comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry (GC × GC-TOFMS) data set to the bioassay data...
Resolution and quantification of complex mixtures of polycyclic aromatic hydrocarbons in heavy fuel oil sample by means of GC × GC-TOFMS combined to multivariate curve resolution
, Article Analytical Chemistry ; Volume 83, Issue 24 , 2011 , Pages 9289-9297 ; 00032700 (ISSN) ; Radović, J. R ; Jalali-Heravi, M ; Diez, S ; Bayona, J. M ; Tauler, R ; Sharif University of Technology
Abstract
Comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GC × GC-TOFMS) combined to multivariate curve resolution-alternating least-squares (MCR-ALS) is proposed for the resolution and quantification of very complex mixtures of compounds such as polycyclic aromatic hydrocarbons (PAHs) in heavy fuel oil (HFO). Different GC × GC-TOFMS data slices acquired during the analysis of HFO samples and PAH standards were simultaneously analyzed using the MCR-ALS method to resolve the pure component elution profiles in the two chromatographic dimensions as well as their pure mass spectra. Outstandingly, retention time shifts within and between GC × GC runs were not affecting...
Comparing different scenarios for thermal enhanced oil recovery in fractured reservoirs using hybrid solar-gas steam generators, a simulation study
, Article Society of Petroleum Engineers - SPE Europec Featured at 78th EAGE Conference and Exhibition, 30 May 2016 through 2 June 2016 ; 2016 ; 9781613994573 (ISBN) ; Bashtani, F ; Tahmasebi, A ; Ayatollahi, S ; Al Wahaibi, Y. M ; Sharif University of Technology
Society of Petroleum Engineers
2016
Abstract
The application of the renewable energy sources, especially solar energy, for thermal enhanced oil recovery methods as an economical and environmental valuable technique has received many attractions recently. Concentrated Solar Power systems are capable of producing substantial quantities of steam by means of focused sunlight as the heat source for steam generation. This paper aims to investigate viability of using this innovative technology in fractured reservoirs to generate steam instead of using conventional steam generators. A synthetic fractured reservoir with properties similar to those of giant carbonate oil reserves in the Middle East was designed by using commercial thermal...
An experimental study on kerosene spray combustion under conventional and hot-diluted conditions
, Article Combustion Science and Technology ; Volume 194, Issue 13 , 2022 , Pages 2712-2751 ; 00102202 (ISSN) ; Azimi, A ; Karimi Motaalegh Mahalegi, H ; Sharif University of Technology
Taylor and Francis Ltd
2022
Abstract
The combustion of kerosene spray under hot-diluted conditions and conventional conditions was experimentally investigated. By examining flame photographs, chemiluminescence images, and in-field temperature measurements, the separate effect of different variables including oxygen concentration, temperature and velocity of the co-flowing air, fuel flow rate and injection pressure, and eventually the type of spray nozzle on multiple parameters such as flame stability, structure, luminosity, temperature field, and qualitative CH radical distribution, as well as HCO and NO2 with lower precision, in the reaction region, have been studied. It was observed that an increment in injection pressure and...
Performance enhancement of dissolved air flotation column in removing low concentrations of heavy fuel oil by adding powdered activated carbon
, Article Desalination and Water Treatment ; Volume 51, Issue 16-18 , 2013 , Pages 3353-3360 ; 19443994 (ISSN) ; Shayegan, J ; Jalali, M ; Sharif University of Technology
Taylor and Francis Inc
2013
Abstract
In this study, the effect of adding walnut shell-based powdered activated carbon (WS) to a bench-scale dissolved air flotation (DAF) column on oil removal was investigated. All experiments were conducted using synthetically prepared wastewater containing low but stable concentrations of heavy fuel oil. After comparing the effect of different WS doses from 0 (blank) to 40 mg/L at the saturator pressure of 5 bar and 10 min flotation time, 20 mg/L WS was chosen as the optimal concentration. In order to find the best flotation time for efficient use of WS capacity, experiments were repeated with and without 20 mg/L WS at longer flotation times. According to the obtained results, by adding WS,...
Two-stage thermocatalytic upgrading of fuel oil to olefins and fuels over a nanoporous hierarchical acidic catalyst
, Article Petroleum Science and Technology ; Volume 37, Issue 16 , 2019 , Pages 1910-1916 ; 10916466 (ISSN) ; Shirvani, S ; Ghambarian, M ; Eidi, A ; Sharif University of Technology
Taylor and Francis Inc
2019
Abstract
A two-stage thermocatalytic upgrading process using a novel catalyst was investigated to produce light olefins and liquid fuels from fuel oil. The upgraded oil from the first thermal stage demonstrated lower viscosity and higher crackability compared to the virgin feedstock. In the next step, the vapor-phase catalytic cracking of the upgraded fraction was implemented over a novel nanoporous composite catalyst, characterized by the XRD, FTIR, NH3- TPD, and N2 physisorption techniques. In total, more than 55 wt% of light olefins, particularly propylene (25.5 wt%) together with 25.4 wt% and 32.5 wt% of gasoline and diesel fuel were obtained in this process. © 2019, © 2019 Taylor & Francis...
Oxidative desulfurization of simulated light fuel oil and untreated kerosene
, Article Fuel Processing Technology ; Volume 90, Issue 3 , 2009 , Pages 435-445 ; 03783820 (ISSN) ; Kiaei, Z ; Sobati, M.A ; Sharif University of Technology
2009
Abstract
An experimental investigation was conducted on the oxidative desulfurization of model sulfur compounds such as dibenzothiophene and benzothiophene in toluene as a simulated light fuel oil with a mixture of hydrogen peroxide as the oxidant and various acids as the catalyst. The influences of various parameters including reaction temperature (T), acid to sulfur molar ratio (Acid/S), oxidant to sulfur molar ratio (O/S), type of acid, and the presence of sodium tungstate and commercial activated carbon as a co-catalyst on the fractional conversion of the model sulfur compounds were investigated. The experimental data obtained were used to determine the reaction rate constant of the model sulfur...
Careful parameter study to enhance the effect of injecting heavy fuel oil into a crossflow using numerical approaches
, Article ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting, FEDSM 2018, 15 July 2018 through 20 July 2018 ; Volume 2 , July , 2018 ; 08888116 (ISSN) ; 9780791851562 (ISBN) ; Fatin, A ; Schneider, G.E ; Fluids Engineering Division ; Sharif University of Technology
American Society of Mechanical Engineers (ASME)
2018
Abstract
The flow and spray parameters can have noticeable roles in heavy fuel oil (HFO) spray finesse. As known, the interaction between droplets and cross flow should be considered carefully in many different industrial applications such as the process burners and gas turbine combustors. So, it would be so important to investigate the effect of injecting HFO into a crossflow more subtly. In this work, the effects of various flow and spray parameters on the droplet breakup and dispersion parameters are investigated numerically using the finite-volume-element method. The numerical method consists of a number of different models to predict the droplets breakup and their dispersion into a cross flow...
Numerical study on NOx reduction in a large-scale heavy fuel oil-fired boiler using suitable burner adjustments
, Article Energy ; Volume 199 , 2020 ; Fatin, A ; Bordbar, H ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
A numerical framework was carefully developed to simulate the combustion of heavy-fuel-oil (HFO) in a large-scale boiler. The present numerical solutions were compared with the measured data of a laboratory benchmark test and on-site operational data of the chosen HFO-fired boiler. Next, the developed framework was used to perform sensitivity analyses aiming to reduce the NO emission from the HFO-fired boiler without any adverse effect on its combustion performance. Practically, this study focused on re-adjustments of 24 working burners, which could control combustion in the HFO-fired boiler. The early outcome showed that the boiler NO emission and its combustion performance could be...