Refinery Planning Presentation

Refinery Planning Presentation - Refinery Modeling Aaron...

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Unformatted text preview: Refinery Modeling Aaron Smith, Michael Frow, Joe Quddus, Donovan Howell, Thomas Reed, Clark Landrum, Brian Clifton May 2, 2006 The Big Black Box The Big Black Box Demand Crude B Crude C Crude A Costs Profit The Big Black Box Demand Crude B Crude C Crude A Costs Profit Hydrotreating INPUT: Temperature Pressure H 2 /HC Ratio Sulfur % Nitrogen % OUTPUT: Sulfur % Nitrogen % Aromatic % MODEL: PBR http://www.osha.gov/dts/osta/otm/otm_iv/otm_iv_2fig25.gif A future of energy production Hydrotreating Removal of sulfur, nitrogen, and aromatics. Government regulations are leading to increased sulfur removal requirements. Typical Processing Conditions 355 800 2000 0.75-2.0 Heavy Gas Oil 425 700 1500 0.7-1.5 Light Gas Oil 330 400 800 1.0-4.0 Middle Distillate 290 200 300 1.0-5.0 Naptha Temperature ( o C) H 2 Pressure (psia) H 2 /HC Space velocity Hydrotreating Cracking is assumed to be insignificant. Therefore, properties such as density and molecular weight are assumed to be constant. Hydrotreating Cracking is assumed to be insignificant. Therefore, properties such as density and molecular weight are assumed to be constant. Hydrotreating Model For MoCo catalyst reaction rates are: Rate s = k s C s 2 C H2 .75 Rate n = k n C n 1.4 C H2 .6 Rate ar = k ar C ar C H2 http://www.chem.wwu.edu/dept/facstaff/bussell/research/images/thio-HDS.jpg Delayed Coking INPUT: CCR Pressure OUTPUT: Gas Oil Coke Gas Naptha MODEL: Correlation Delayed Coking Used to process bottoms from the vacuum distillate. Breaks down this portion into usable napthas, gas, and gas oil. Delayed Coking Coke Products Shot Coke Sponge Coke Needle Coke Delayed Coking Model Most important parameter is the Conradson Carbon Residue. Coke = 1.6 x CCR Gas = 7.8 + .144 x CCR Naptha = 11.29 + .343 x CCR Gas oil = 100 Coke Gas - Naptha This is an estimate from Gary and Handwerk Effect of Pressure on Product 44.9 51.2 43.1 Gas Oil Yield 15 12.5 17.5 Naptha Yield 9.9 9.1 10.4 Gas Yield 30.2 27.2 29 Coke 35 psig 15 psig Correlation 18.1 CCR (wt%) Delayed Coking Model Modified Equations Gas = (7.4 + (.1 x CCR)) + (.8 x (P-15)/20) Naptha = (10.29 + (.2 x CCR)) + (2.5 x (P-15)/20) Coke = (1.5 x CCR) + (3 x (P-15)/20) Gas oil = 100 Gas Naptha - Coke New Correlation 44.9 51.2 43.4 49.7 Gas Oil Yield 15 12.5 16.4 13.9 Naptha Yield 9.9 9.1 10.0 9.2 Gas Yield 30.2 27.2 30.2 27.2 Coke 35 psig 15 psig Correlation (35 psig) Correlation (15 psig) 18.1 CCR (wt%) Catalytic Reforming INPUT: Temperature Pressure % Napthenes % Aromatics % Paraffins OUTPUT: Hydrogen LPG Reformate MODEL: PBR Catalytic Reforming Catalytic Reforming Hydrogen Intensive Process Units Xylenes Isomerization Boilers Catalytic Reforming Simplified reactions and equations from Case Study 108 by Rase ( 29 ( 29 ( 29 ( 29 napthenes of ing Hydrocrack paraffins of ing Hydrocrack H napthenes Paraffins H aromatics Napthenes _ _ 4 _ _ 3 2 * 3 1 2 2 + + Catalytic Reforming...
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Refinery Planning Presentation - Refinery Modeling Aaron...

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