I.Problem definition

فهرست عناوین اصلی در این پاورپوینت

فهرست عناوین اصلی در این پاورپوینت

● Introduction
● Classification of the models
● Elements of the model
● Structure of the simulation model
● Structure of the model
● Process simulation
● Process simulation (steady state)
● Flowsheeting problem
● Specyfication problem
● Process optimisation
● Process synthesis/design problem
● Process simulation – why?
● Modelling objects in chemical and process engineering
● Software for process simulation
● Software process simulators (flawsheeting programs)
● Chemical plant system
● Apparatus-streams separation
● Streams parameters
● Streams degrees of freedom
● Apparatus parameters & DF
● Types of flowsheeting calculation
● Calculation subject
● Types of balance calculation
● Overall balance
● Overall balance – Example
● Apparatus model involved
● Loops and cut streams
● Simulation of system with heat exchanger using MathCAD
● I.Problem definition
● II. Flawsheet
● Numerical data:
● Equipment parameters:
● III. Stream summary table
● Equations from equipment information
● Heat balance equations
● Heat exchange equations
● Pressure drop
● Agents parameters
● Approximation
● Polynomial approximation
● The end as of yet.

نوع زبان: انگلیسی حجم: 0.74 مگا بایت
نوع فایل: اسلاید پاورپوینت تعداد اسلایدها: 72 صفحه
سطح مطلب: نامشخص پسوند فایل: ppt
گروه موضوعی: زمان استخراج مطلب: 2019/06/07 11:43:17

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عبارات مهم استفاده شده در این مطلب

عبارات مهم استفاده شده در این مطلب

–, ., process, apparatus, parameter, problem, stream, model, composition, output, balance, input,

توجه: این مطلب در تاریخ 2019/06/07 11:43:17 به صورت خودکار از فضای وب آشکار توسط موتور جستجوی پاورپوینت جمع آوری شده است و در صورت اعلام عدم رضایت تهیه کننده ی آن، طبق قوانین سایت از روی وب گاه حذف خواهد شد. این مطلب از وب سایت زیر استخراج شده است و مسئولیت انتشار آن با منبع اصلی است.

http://www.chemia.polsl.pl/~jkocurek/pliki/Lecture5.ppt

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عبارات پرتکرار و مهم در این اسلاید عبارتند از: –, ., process, apparatus, parameter, problem, stream, model, composition, output, balance, input,

مشاهده محتوای متنیِ این اسلاید ppt

مشاهده محتوای متنیِ این اسلاید ppt

introduction process simulation classification of the models black box – white box black box – know nothing about process in apparatus only dependences between inputs and outputs are established. practical realisation of black box is the neural network white box – process mechanism is well known and described by system of equations classification of the models deterministic – stochastic deterministic – for one given set of inputs only one set of outputs is calculated with probability equal ۱. stochastic – random phenomenon affects on process course e.g. weather output set is given as distribution of random variables classification of the models microscopic macroscopic microscopic – includes part of process or apparatus macroscopic – includes whole process or apparatus elements of the model balance dependences based upon basic nature laws of conservation of mass of conservation of energy of conservation of atoms number of conservation of electric charge etc. balance equation for mass overall and for specific component without reaction input – output accumulation or for specific component if chemical reactions presents input – output source accumulation elements of the model constitutive equations newton eq. – for viscous friction fourier eq. – for heat conduction fick eq. – for mass diffusion elements of the model phase equilibrium equations – important for mass transfer physical properties equations – for calculation parameters as functions of temperature pressure and concentrations. geometrical dependences – involve influence of apparatus geometry on transfer coefficients – convectional streams. structure of the simulation model structure corresponds to type of model equations structure depends on type of object work continuous steady running periodic unsteady running distribution of parameters in space equal in every point of apparatus – aggregated parameters butch reactor with ideal mixing parameters are space dependent– displaced parameters structure of the model steady state unsteady state aggregated parameters algebraic eq. ordinary differential eq. displaced parameters differential eq. ordinary for ۱ dimensional case partial for ۲ ۳ dimensional case without time derivative usually elliptic partial differential eq. with time derivative usually parabolic process simulation the act of representing some aspects of the industry process in the real world by numbers or symbols in the virtual world which may be manipulated to facilitate their study. facilitate ułatwiać process simulation steady state flowsheeting problem specification design problem optimization problem synthesis problem by rafiqul gani flowsheeting problem given all of the input information all of the operating condition all of the equipment parameters to calculate all of the outputs r.gani specyfication problem given some input some output information some operating condition some equipment parameters to calculate undefined inputs outputs undefined operating condition undefined equipment parameters specyfication problem note degree of freedom is the same as in flowsheeting problem. assume value to be guessed d qr solve the flowsheeting problem stop is target product composition satisfied adjust d qr given feed composition and flowrates target product composition find product flowrates heating duties process optimisation the act of finding the best solution minimize capital costs energy … maximize yield to manage the process by changing some parameters not apparatus solve the flowsheeting problem stop is target product composition satisfied and  min. adjust d qr given feed composition and flowrates target product composition find product flowrate heating duty assume value to be guessed d qr process synthesis design problem the act of creation of a new process. given inputs some feeding streams can be added changed latter outputs some byproducts may be unknown to find flowsheet topology equipment parameters operations conditions process synthesis design problem flowsheet undefined input output solve the flowsheeting problem stop is target product composition satisfied and  min. adjust d qr as well as n nf r d etc. given feed composition and flowrates target product composition find product flowrate heating duty column param. etc. assume value to be guessed d qr n nf r d etc. process simulation why costs material – easy to measure time – could be estimated risc – hard to measure and estimate modelling objects in chemical and process engineering unit operation process build up on a few unit operations software for process simulation universal software worksheets – excel calc open office mathematical software – mathcad matlab specialized software – process simulators. equipped with data base of apparatus models data base of components and mixtures properties solver engine user friendly interface software process simulators flawsheeting programs started in early ۷ ’ at the beginning dedicated to special processes progress toward universality some actual process simulators aspen tech hysys chemcad pro ii prosim design ii for windows chemical plant system the apparatus set connected with material and energy streams. most contemporary systems are complex i.e. consists of many apparatus and streams. simulations can be use during investigation works – new technology project step – new plants technology exists runtime problem identification solving – existing systems technology and plant exists test chemical plant system characteristic parameters can be specified for every system separately according to material streams apparatus apparatus streams separation assumption all processes chemical reaction heat exchange etc. taking places in the apparatus and streams are in the chemical and thermodynamical equilibrium state. why separate it’s make calculations easier streams parameters flow rate mass volume mol per time unit composition mass volume molar fraction temperature pressure vapor fraction enthalpy streams degrees of freedom dfs nc ۲ e.g. nc ۲ dfs ۴ assumed f۱ f۲ t p calculated enthalpy vapor fraction apparatus parameters df characteristics for each apparatus type. e.g. heat exchanger heat exchange area a m۲ overall heat transfer coefficient u k wm ۲k ۱ log mean temperature difference lmtd k degrees of freedom are unique to equipment type types of flowsheeting calculation steady state calculation dynamic calculation calculation subject number of equations of mass and energy balance for entire system can be solved in two ways types of balance calculation overall balance without use of apparatus mathematical model detailed balance on the base of apparatus model overall balance apparatus is considered as a black box needs more stream data user could not be informed about if the process is physically possible to realize. overall balance – example countercurrent tube shell heat exchanger given three streams data ۱ ۲ ۳ hence parameters of stream ۴ can be easily calculated from the balance equation. there is possibility that calculated temp. of stream ۴ can be higher then inlet temp. of heating medium stream ۱ . df ۵ overall balance – example given ma ۱ kg s mb ۲ kg s t۱ ۷ °c t۲ ۴ °c t۳ ۲ °c cpa cpb idem at first sight – na pierwszy rzut oka apparatus model involved process is being described with use of modeling equations differential dimensionless etc. only …

کلمات کلیدی پرکاربرد در این اسلاید پاورپوینت: –, ., process, apparatus, parameter, problem, stream, model, composition, output, balance, input,

این فایل پاورپوینت شامل 72 اسلاید و به زبان انگلیسی و حجم آن 0.74 مگا بایت است. نوع قالب فایل ppt بوده که با این لینک قابل دانلود است. این مطلب برگرفته از سایت زیر است و مسئولیت انتشار آن با منبع اصلی می باشد که در تاریخ 2019/06/07 11:43:17 استخراج شده است.

http://www.chemia.polsl.pl/~jkocurek/pliki/Lecture5.ppt

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