Bio & Biblio This     website    is    moderated    by    Ali    P.    Laleh,    PhD,    P.Eng.    He    is    an    aspiring chemical   engineer   with   more   than   15   years   of   experience   as   a   Process   Research Engineer,    involved    in    rectifying    industrial    scale    process    inefficiencies    and optimizing   chemical   plants.   His   background   in   chemical   engineering   has   been formed    with    a    strong    orientation    toward    oil    production    and    petrochemical processes.    His    earned    academic    degrees    include    a    BSc    (2000)    from    Sahand University   of   Technology,   a   MSc   (2003)   from   Sharif   University   of   Technology,   and   a   PhD   (2010) from   the   University   of   Calgary,   all   in   the   field   of   Chemical   Engineering.   In   the   MSc   program,   he proposed   a   novel   approach   for   automatic   design   of   the   optimum   distillation   column   sequence using   a   global   evolutionary   optimization   method,   i.e.   Genetic   Algorithms.   In   the   PhD   career,   he developed   an   efficient   strategy   for   realistic   simulation   of   oilfield   separators.   Explained   in   his thesis,   the   simulation   was   based   on   Computational   Fluid   Dynamics   (CFD)   and   led   to   rectifying the   design   issues   with   these   multiphase   separators. After   graduation,   he   worked   as   a   Simulation Engineer   in   the   Reservoir   Simulation   Group   at   the   University   of   Calgary.   The   simulation   case   of interest   was   in-situ   upgrading   process   by   hot   fluid   injection   for   Athabasca   oilfield.   The   work scope    included    feasibility    and    sensitivity    analyses    of    the    process    and    finding    its    optimum operational   parameters.   He’s   been   involved   with   industrial   process   engineering   projects   since 2012   (with   Jacobs   Canada   Inc.)   and   is   currently   developing   mobile   apps   in   the   field   of   Chemical Process   Design.   The   developed   apps   for   sizing   multiphase   separators   are   based   on   his   PhD research   findings   and   result   in   the   realistic   optimum   (the   most   economical)   design   for   oilfield separators. Here you find the relevant literature associated with the CFD-based realistic approach developed for optimum design of the oilfield separators: Book Pourahmadi Laleh, A., Svrcek, W.Y., Monnery, W.D., “CFD Simulation of Oilfield Separators: A Realistic Approach”, LAMBERT Academic Publishing, 2011. Overview:    In   this   book,   a   realistic   simulation   approach   based   on   Computational   Fluid   Dynamics (CFD)   is   developed   to   provide   high-quality   visualization   of   the   multiphase   separation   process. Furthermore,   classic   separator   design   methodologies   are   evaluated   and   improved   design   criteria are   proposed.   A   useful   method   is   presented   for   estimation   of   the   droplet   sizes   used   to   calculate realistic   separation   velocities   for   various   oilfield   conditions.   The   velocity   constraints   associated with   re-entrainment   phenomenon   are   also   discussed   and   novel   correlations   are   provided.   This book,   also   demonstrates   the   benefits   that   CFD   analyses   provide   in   optimizing   the   design   of   new separators and solving problems with existing designs. Papers 1. Svrcek, W.Y., Monnery, W.D., “Design Two-Phase Separators within the Right Limits”, Chem. Eng. Progress, 89(10), 1993, 53-60. Overview:   This   internationally-acclaimed   paper   presents   an   algorithmic   method   for   sizing   the most    economical    two-phase    separator.    Different    approaches,    i.e.    GPSA,    York    Demister,    and Theoretical,   to   estimating   phase   separation   velocities   are   included.   The   design   procedure   is explained by worked examples. 2. Monnery, W.D., Svrcek, W.Y., “Successfully Specify Three-Phase Separators”, Chem. Eng. Progress, 90(9), 1994, 29-40. Overview:   This   internationally-acclaimed   paper   presents   an   algorithmic   method   for   sizing   the most   economical   three-phase   separator.   Different   approaches,   i.e.   GPSA,   York   Demister,   and Theoretical,   to   estimating   phase   separation   velocities   are   included.   The   design   procedure   is explained by worked examples. 3. Pourahmadi Laleh, A., Svrcek, W.Y., Monnery, W.D., “Computational Fluid Dynamics Simulation of Pilot-Plant-Scale Two-Phase Separators”, Chemical Engineering and Technology, 34(2), 2011, 296-306. Overview:    Two   computational   fluid   dynamics   (CFD)   modeling   approaches,   the   discrete   phase model    (DPM)    and    the    combination    of    volume    of    fluid    (VOF)    and    DPM,    are    developed    to simulate   the   phase   separation   phenomenon   in   four   pilot-plant   scale   separators.   The   incipient vapor   phase   velocity,   at   which   liquid   droplet   carryover   occurs,   and   separation   efficiency   plots are   used   as   criteria   for   evaluating   the   developed   CFD   models.   The   simulation   results   indicate that   the   VOF-DPM   approach   is   a   substantial   modification   to   the   DPM   approach   in   terms   of   the predicted   separation   efficiency   data   and   diagrams.   CFD   simulation   profiles   demonstrate   that   all the   separators   are   essentially   operating   at   a   constant   pressure.   The   CFD   results   also   show   that mist    eliminators    may    operate    more    efficiently    in    horizontal    separators    than    in    vertical separators. 4. Pourahmadi Laleh, A., Svrcek, W.Y., Monnery, W.D., “Design and CFD Studies of Multiphase Separators-A Review", The Canadian Journal of Chemical Engineering, 90(6), 2012, 1547-1560. Overview:    The   literature   on   the   multiphase   separators   abounds   with   macro   studies   and   design methodologies   for   two-   and   three-phase   vertical   and   horizontal   separators.   There   are   very   few studies   that   provide   the   micro   details   of   the   actual   separation   process.   This   paper   reviews   the important   relevant   literature   for   multiphase   separators   and   does   include   the   few   CFD-based studies    of    multiphase    separators.    However,    classic    guidelines    for    design    of    multiphase separators   and   two   academic   experimental   research   projects   have   also   been   reviewed.   In   the classic   methods,   vapour–liquid   and   liquid–liquid   separation   compartments   are   designed   based on   droplet   settling   theory.   Moreover,   the   retention   time   of   liquid   phase   is   selected   based   on empirical   data   or   heuristics   for   establishing   a   safe   and   smooth   operation   of   the   separator   and downstream   equipment.   In   fact,   the   popular   classic   methods   for   separator   design,   mostly   due   to a   lack   of   a   usable   mathematical   model   for   estimation   of   phase   separation   velocities,   do   result   in a   conservative   design   and   would   specify   extremely   oversized   separators.   In   order   to   reflect   the current   situation   and   address   recent   findings,   this   study   reviews   the   important   literature   on design   and   CFD   simulation   of   multiphase   separators.   This   review   shows   the   benefits   that   CFD analyses   can   provide   in   optimising   the   design   of   new   separators   and   solving   problems   with existing designs. 5. Pourahmadi Laleh, A., Svrcek, W.Y., Monnery, W.D., “Design Criteria for Oilfield Separators Improved by Computational Fluid Dynamics”, Chemical Engineering and Technology, 35(2), 2012, 323-333. Overview:    Oilfield   separator   data   ranging   from   light-oil   conditions   to   heavy-oil   conditions   were incorporated    into    suitable    two-phase    and    three-phase    computational    fluid    dynamics    (CFD) models   to   provide   improved   design   criteria   for   separator   design   methods.   The   CFD   simulation results   revealed   that   the   most   important   affecting   parameters   are   vapor   density   and   oil   viscosity. In   contrast   with   the   classic   design   methods,   noticeable   residence   times   were   required   for   liquid droplets   to   penetrate   through   the   fluid   interfaces.   Moreover,   it   was   indicated   that   the   Abraham equation   should   be   used   instead   of   the   Stokes’   law   in   the   liquid-liquid   separation   calculations. The   velocity   constraints   caused   by   re-entrainment   in   horizontal   separators   were   also   studied   and led to novel correlations. 6. Pourahmadi Laleh, A., Svrcek, W.Y., Monnery, W.D., “Computational Fluid Dynamics-Based Study of an Oilfield Separator-Part I: A Realistic Simulation", SPE-Oil and Gas Facilities, 1(6), 2012, 57-68. Overview:    A   realistic   CFD   simulation   of   a   field   three-phase   separator   has   been   developed.   This realistic   simulation   provides   an   understanding   of   both   microscopic   and   macroscopic   features   of the   three-phase   separation   phenomenon.   For   simulation   purposes,   an   efficient   combination   of two   multiphase   models   of   the   commercial   CFD   software,   ANSYS   Fluent,   was   implemented.   The flow-distributing   baffles   and   wire   mesh   demister   were   also   modeled   using   the   porous   media model.   Furthermore,   a   useful   approach   to   estimating   the   particle   size   distribution   in   oilfield separators    was    developed.    The    simulated    fluid-flow    profiles    are    realistic    and    the    predicted separation efficiencies are consistent with oilfield experience. 7. Pourahmadi Laleh, A., Svrcek, W.Y., Monnery, W.D., “Computational Fluid Dynamics-Based Study of an Oilfield Separator-Part II: An Optimum Design", SPE-Oil and Gas Facilities, 2(1), 2013, 52-59. Overview:     This    paper    provides    details    of    comprehensive    CFD-based    studies    performed    to overcome   the   separation   inefficiencies   experienced   in   a   large-scale   three-phase   separator.   It   is shown    that    the    classic    design    methods    are    too    conservative    and    would    result    in    oversized separators.   In   this   study,   effective   CFD   models   were   developed   to   estimate   the   phase-separation parameters    that    were    integrated    into    an    algorithmic    design    method    to    specify    a    realistic optimum   separator.   The   CFD   simulations   indicated   that   noticeable   residence   times   are   required for   liquid   droplets   to   penetrate   through   the   interfaces,   and   liquid   droplets   would   be   re-entrained from the liquid-liquid interface vicinity by the continuous liquid phase.
salvasolution.com  2017 by Ali P. Laleh                                    All rights reserved. Bio & Biblio
Bio & Biblio This    website   is   moderated   by   Ali   P.   Laleh, PhD,    P.Eng.    He    is    an    aspiring    chemical engineer     with     more     than     15     years     of experience   as   a   Process   Research   Engineer, involved      in      rectifying      industrial      scale process       inefficiencies       and       optimizing chemical   plants.   His   background   in   chemical   engineering has    been    formed    with    a    strong    orientation    toward    oil production      and      petrochemical      processes.      His      earned academic     degrees     include     a     BSc     (2000)     from     Sahand University     of     Technology,     a     MSc     (2003)     from     Sharif University    of    Technology,    and    a    PhD    (2010)    from    the University     of     Calgary,     all     in     the     field     of     Chemical Engineering.    In    the    MSc    program,    he    proposed    a    novel approach   for   automatic   design   of   the   optimum   distillation column   sequence   using   a   global   evolutionary   optimization method,    i.e.    Genetic    Algorithms.    In    the    PhD    career,    he developed   an   efficient   strategy   for   realistic   simulation   of oilfield   separators.   Explained   in   his   thesis,   the   simulation was   based   on   Computational   Fluid   Dynamics   (CFD)   and   led to     rectifying     the     design     issues     with     these     multiphase separators.    After    graduation,    he    worked    as    a    Simulation Engineer     in     the     Reservoir     Simulation     Group     at     the University   of   Calgary.   The   simulation   case   of   interest   was in-situ     upgrading     process     by     hot     fluid     injection     for Athabasca   oilfield.   The   work   scope   included   feasibility   and sensitivity   analyses   of   the   process   and   finding   its   optimum operational   parameters.   He’s   been   involved   with   industrial process   engineering   projects   since   2012   (with   Jacobs   Canada Inc.)   and   is   currently   developing   mobile   apps      in   the   field   of Chemical    Process    Design.    The    developed    apps    for    sizing multiphase     separators     are     based     on     his     PhD     research findings    and    result    in    the    realistic    optimum    (the    most economical) design for oilfield separators. Here you find the relevant literature associated with the CFD-based realistic approach developed for optimum design of the oilfield separators: Book Pourahmadi Laleh, A., Svrcek, W.Y., Monnery, W.D., “CFD Simulation of Oilfield Separators: A Realistic Approach”, LAMBERT Academic Publishing, 2011. Overview:     In    this    book,    a    realistic    simulation    approach based      on      Computational      Fluid      Dynamics      (CFD)      is developed    to    provide    high-quality    visualization    of    the multiphase       separation       process.       Furthermore,       classic separator   design   methodologies   are   evaluated   and   improved design   criteria   are   proposed.   A   useful   method   is   presented for   estimation   of   the   droplet   sizes   used   to   calculate   realistic separation    velocities    for    various    oilfield    conditions.    The velocity       constraints       associated       with       re-entrainment phenomenon   are   also   discussed   and   novel   correlations   are provided.    This    book,    also    demonstrates    the    benefits    that CFD    analyses    provide    in    optimizing    the    design    of    new separators and solving problems with existing designs. Papers 1. Svrcek, W.Y., Monnery, W.D., “Design Two-Phase Separators within the Right Limits”, Chem. Eng. Progress, 89(10), 1993, 53-60. Overview:   This   internationally-acclaimed   paper   presents   an algorithmic    method    for    sizing    the    most    economical    two- phase    separator.    Different    approaches,    i.e.    GPSA,    York Demister,   and   Theoretical,   to   estimating   phase   separation velocities   are   included.   The   design   procedure   is   explained by worked examples. 2. Monnery, W.D., Svrcek, W.Y., “Successfully Specify Three-Phase Separators”, Chem. Eng. Progress, 90(9), 1994, 29-40. Overview:   This   internationally-acclaimed   paper   presents   an algorithmic   method   for   sizing   the   most   economical   three- phase    separator.    Different    approaches,    i.e.    GPSA,    York Demister,   and   Theoretical,   to   estimating   phase   separation velocities   are   included.   The   design   procedure   is   explained by worked examples. 3. Pourahmadi Laleh, A., Svrcek, W.Y., Monnery, W.D., “Computational Fluid Dynamics Simulation of Pilot-Plant- Scale Two-Phase Separators”, Chemical Engineering and Technology, 34(2), 2011, 296-306. Overview:      Two     computational     fluid     dynamics     (CFD) modeling   approaches,   the   discrete   phase   model   (DPM)   and the   combination   of   volume   of   fluid   (VOF)   and   DPM,   are developed   to   simulate   the   phase   separation   phenomenon   in four   pilot-plant   scale   separators.   The   incipient   vapor   phase velocity,    at    which    liquid    droplet    carryover    occurs,    and separation   efficiency   plots   are   used   as   criteria   for   evaluating the   developed   CFD   models.   The   simulation   results   indicate that   the   VOF-DPM   approach   is   a   substantial   modification   to the    DPM    approach    in    terms    of    the    predicted    separation efficiency    data    and    diagrams.    CFD    simulation    profiles demonstrate   that   all   the   separators   are   essentially   operating at   a   constant   pressure.   The   CFD   results   also   show   that   mist eliminators    may    operate    more    efficiently    in    horizontal separators than in vertical separators. 4. Pourahmadi Laleh, A., Svrcek, W.Y., Monnery, W.D., “Design and CFD Studies of Multiphase Separators-A Review", The Canadian Journal of Chemical Engineering, 90(6), 2012, 1547-1560. Overview:     The    literature    on    the    multiphase    separators abounds   with   macro   studies   and   design   methodologies   for two-    and    three-phase    vertical    and    horizontal    separators. There   are   very   few   studies   that   provide   the   micro   details   of the     actual     separation     process.     This     paper     reviews     the important   relevant   literature   for   multiphase   separators   and does    include    the    few    CFD-based    studies    of    multiphase separators.     However,     classic     guidelines     for     design     of multiphase     separators     and     two     academic     experimental research    projects    have    also    been    reviewed.    In    the    classic methods,      vapour–liquid      and      liquid–liquid      separation compartments     are     designed     based     on     droplet     settling theory.    Moreover,    the    retention    time    of    liquid    phase    is selected      based      on      empirical      data      or      heuristics      for establishing   a   safe   and   smooth   operation   of   the   separator and    downstream    equipment.    In    fact,    the    popular    classic methods    for    separator    design,    mostly    due    to    a    lack    of    a usable     mathematical     model     for     estimation     of     phase separation   velocities,   do   result   in   a   conservative   design   and would   specify   extremely   oversized   separators.   In   order   to reflect   the   current   situation   and   address   recent   findings,   this study   reviews   the   important   literature   on   design   and   CFD simulation   of   multiphase   separators.   This   review   shows   the benefits   that   CFD   analyses   can   provide   in   optimising   the design     of     new     separators     and     solving     problems     with existing designs. 5. Pourahmadi Laleh, A., Svrcek, W.Y., Monnery, W.D., “Design Criteria for Oilfield Separators Improved by Computational Fluid Dynamics”, Chemical Engineering and Technology, 35(2), 2012, 323-333. Overview:     Oilfield    separator    data    ranging    from    light-oil conditions   to   heavy-oil   conditions   were   incorporated   into suitable    two-phase    and    three-phase    computational    fluid dynamics   (CFD)   models   to   provide   improved   design   criteria for   separator   design   methods.   The   CFD   simulation   results revealed   that   the   most   important   affecting   parameters   are vapor   density   and   oil   viscosity.   In   contrast   with   the   classic design   methods,   noticeable   residence   times   were   required for   liquid   droplets   to   penetrate   through   the   fluid   interfaces. Moreover,    it    was    indicated    that    the    Abraham    equation should   be   used   instead   of   the   Stokes’   law   in   the   liquid- liquid     separation     calculations.     The     velocity     constraints caused   by   re-entrainment   in   horizontal   separators   were   also studied and led to novel correlations. 6. Pourahmadi Laleh, A., Svrcek, W.Y., Monnery, W.D., “Computational Fluid Dynamics-Based Study of an Oilfield Separator-Part I: A Realistic Simulation", SPE-Oil and Gas Facilities, 1(6), 2012, 57-68. Overview:    A   realistic   CFD   simulation   of   a   field   three-phase separator    has    been    developed.    This    realistic    simulation provides     an     understanding     of     both     microscopic     and macroscopic      features      of      the      three-phase      separation phenomenon.      For      simulation      purposes,      an      efficient combination   of   two   multiphase   models   of   the   commercial CFD   software,   ANSYS   Fluent,   was   implemented.   The   flow- distributing    baffles    and    wire    mesh    demister    were    also modeled    using    the    porous    media    model.    Furthermore,    a useful   approach   to   estimating   the   particle   size   distribution in   oilfield   separators   was   developed.   The   simulated   fluid- flow    profiles    are    realistic    and    the    predicted    separation efficiencies are consistent with oilfield experience. 7. Pourahmadi Laleh, A., Svrcek, W.Y., Monnery, W.D., “Computational Fluid Dynamics-Based Study of an Oilfield Separator-Part II: An Optimum Design", SPE-Oil and Gas Facilities, 2(1), 2013, 52-59. Overview:     This    paper    provides    details    of    comprehensive CFD-based   studies   performed   to   overcome   the   separation inefficiencies     experienced     in     a     large-scale     three-phase separator.   It   is   shown   that   the   classic   design   methods   are   too conservative   and   would   result   in   oversized   separators.   In this     study,     effective     CFD     models     were     developed     to estimate      the      phase-separation      parameters      that      were integrated   into   an   algorithmic   design   method   to   specify   a realistic   optimum   separator.   The   CFD   simulations   indicated that    noticeable    residence    times    are    required    for    liquid droplets    to    penetrate    through    the    interfaces,    and    liquid droplets    would    be    re-entrained    from    the    liquid-liquid interface vicinity by the continuous liquid phase.
salvasolution.com  2017 by Ali P. Laleh            All rights reserved.