مدل سازي و شبيه سازي كوره 202 پالايشگاه تهران

چكيده انگليسي :

Modeling and Simulation of Furnace H 202 in Tehran Refinery Mohammad Ali Gholami Ghasri Mohammadali Gholamy @yahoo com April 17 2011 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Arjmand Mehrabani Zeinabad Arjomand@cc iut ac ir Mohsen Davazdahemami Mohsen@cc iut ac irAbstractModeling and simulation of furnace H 202 in Tehran oil Refinery Company was performed by Fluentsoftware to optimize consumed fuel and enhance environmental protection commitments The furnace isnatural draft and it has equipped with four burners at its bottom Simulation of furnace structure wasperformed by Solid Work software and meshed by Gambit software Due to symmetrical structure of thefurnace it was simulated in 3D mode All simulations were performed under steady state condition Pressuredrop in natural draft furnace is very important thus all the convection and radiation tubes are simulated in thissimulation The structure of the furnace is complicated in this regard to optimize the volume of thecalculations the optimum mesh size of 1700000 was used in this simulation Initially after validation of thedeveloped model the result of model was used for estimating the optimum condition for operation thefurnace In this work the effect of variation of excess air as important and effective parameters on efficiencyof the furnace was studied through simulation of the furnace temperature and regarding combustion state Theresult was used for evaluation of its optimum value Simulation results showed that natural draft was aneffective parameter on thermal efficiency of the furnace s convective section By reduction of the draft velocity of combustion gases was decreased and consequently convective heat transfer coefficient decreased the results of velocity calculation in this section shows that the velocity of 3 5 m s is the best velocity forreaching to the maximum efficiency in convection section The results shows that the furnace in 75 Pa draftpressure has optimum efficiency in both convection and radiation sections Equilibrium mechanism is anordinary mechanism for modeling of combustion although including equilibrium assumption the differencesbetween experimental data and simulation result was reasonable For further study on combustion modelinganother mechanism of GRI Mech 3 0 was also investigated for combustion modeling The differencesbetween the gained results and experimental ones are reasonable The error between the simulation andexperimental results for temperature at entrance of convection zoon is 7 1 percent for equilibriummechanism and is 11 1 percent for GRI Mech 3 0 mechanism The error between the simulation andexperimental results for CO2 concentration in entrance of convection zoon for equilibrium mechanism is 30percent and for GRI Mech 3 0 mechanism is 20 percent One of the reasons for these errors is leakage of airfrom the existing connections in convection parts Another reason is the modeling assumptions The GRI Mech 3 0 mechanism has the ability to predict the amount of NO which is very important in environmentalprotection Keywords Furnace natural draft excess air fluent CFD modeling simulation

غلامي قصري، محمد علي

مدل سازي و شبيه سازي كوره 202 پالايشگاه تهران

مكش طبيعي , هواي اضافه , ديناميك سيالات محاسباتي