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Refinery Planning Presentation

Refinery Planning Presentation - Refinery Modeling Aaron...

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Refinery Modeling Aaron Smith, Michael Frow, Joe Quddus, Donovan Howell, Thomas Reed, Clark Landrum, Brian Clifton May 2, 2006
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The Big Black Box
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The Big Black Box Demand Crude B Crude C Crude A Costs Profit
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The Big Black Box Demand Crude B Crude C Crude A Costs Profit
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Hydrotreating INPUT: Temperature Pressure H 2 /HC Ratio Sulfur % Nitrogen % OUTPUT: Sulfur % Nitrogen % Aromatic % MODEL: PBR
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http://www.osha.gov/dts/osta/otm/otm_iv/otm_iv_2fig25.gif
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A future of energy production… Hydrotreating Removal of sulfur, nitrogen, and aromatics. Government regulations are leading to increased sulfur removal requirements.
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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
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Hydrotreating Cracking is assumed to be insignificant. – Therefore, properties such as density and molecular weight are assumed to be constant.
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Hydrotreating Cracking is assumed to be insignificant. – Therefore, properties such as density and molecular weight are assumed to be constant.
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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
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Delayed Coking INPUT: CCR Pressure OUTPUT: Gas Oil Coke Gas Naptha MODEL: Correlation
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Delayed Coking Used to process bottoms from the vacuum distillate. Breaks down this portion into usable napthas, gas, and gas oil.
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Delayed Coking Coke Products Shot Coke Sponge Coke Needle Coke
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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
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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%)
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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
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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%)
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