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-25.17x10 6 Kcal/hr

Modeling an Atmospheric Crude Tower. -25.17x10 6 Kcal/hr. -27.80x10 6 Kcal/hr. OFF GAS. o. 161. C. 1.41K. 123 o C. 60 o C. 0.97K. LSR : 3,549 T/D (16.9wt%). 0.97K. 1. 132 o C. -13.94x10 6 Kcal/hr 376,130 Kg/hr. 10. o. 180. C. , 1.53K. 15. STM1 : 1313 Kg/hr. 192 o C.

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-25.17x10 6 Kcal/hr

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  1. Modeling an Atmospheric Crude Tower -25.17x106Kcal/hr -27.80x106Kcal/hr OFF GAS o 161 C 1.41K 123oC 60oC 0.97K LSR : 3,549 T/D (16.9wt%) 0.97K 1 132oC -13.94x106Kcal/hr 376,130 Kg/hr 10 o 180 C , 1.53K 15 STM1 : 1313 Kg/hr 192oC 168oC o HSR : 921 T/D (4.39 wt%) 169 C 28 -9.14x106Kcal/hr 234,857 Kg/hr 31 o 219 C , 1.68K 228oC STM2 : 1243 Kg/hr o 209 C KERO : 1,333 T/D (6.35 wt%) 221oC 38 -12.25x106Kcal/hr 298,087 Kg/hr 43 o 273 C , 1.76K 281oC STM3 : 3418 Kg/hr o 265 C LGO : 3,822 T/D (18.2 wt%) CRUDE : 21,000 T/D 15oC 268oC o 364 C 49 358 o C -16.50x106Kcal/hr 56 STM4 : 11603 Kg/hr o 349 C , 1.85K RESIDUE : 11,375 T/D (54.16 wt%)

  2. Problem Description: • A crude unit is designed to process 21,000 tons per day of 50% • Arabian heavy crude and 50% Arabian light crude. The desired • products are shown in the next slide, with specifications in Table 1. • 250oC steam (assumed to be saturated) is available for stripping. • The condenser is to operate at 123oC and 0.97 Kg/cm2G. • An initial simulation model was constructed as shown in the above • slide. ASTM D86 95% temperatures were used for HSR, Kerosene • and LGO. The overflash (0.03) was set as a specification. A partial • condenser was used to meet the desired temperature of 123oC.

  3. ASTM D86 Temperatures for Side Distillates Products GAP = 2 (-3) GAP = 11 (3) GAP = 12 (3)

  4. Feedstock Characterization for Crude Oils

  5. Feedstock Characterization for Crude Oils

  6. Lightend Analysis for Arabian Heavy Crude

  7. Feedstock Characterization for Crude Oils

  8. Feedstock Characterization for Crude Oils

  9. Lightend Analysis for Arabian Light Crude

  10. Crude Distillation Column: Tray Efficiencies Typical Tray Efficiencies for Each Section:

  11. RETURN DRAW SIDE DISTILLATE STEAM Crude Oil Distillation : SIMULATION BASICS SIDE STRIPPING OF PRODUCTS : • STEAM: • 4 – 6 TRAYS • REBOILED: • 6 – 10 TRAYS • IMPROVES D86 5% POINTS BY • STRIPPING TO REMOVE LIGHT • ENDS • TYPICAL STEAM: • 0.1 – 0.25 LBS/GALLON • [12 – 30 KG/M3] OF PRODUCT

  12. Crude Oil Distillation : CONTINUED BOTTOM STRIPPING STEAM : • STRIP GAS OIL FROM BOTTOMS • TO RAISE D86 5% OF BOTTOMS • LOWER HYDROCARBON PARTIAL • PRESSURE IN THE FLASH ZONE • USE 2 THEORETICAL TRAYS • EXCLUDING FLASH ZONE FLASH ZONE CRUDE OIL STEAM TOPPED CRUDE

  13. CDU: Simulation Flowsheet OFF GAS o 161 C 1.41K 0.04K LSR : 3,549 T/D 0.97K 2 9 10 1 STM1 2 o HSR : 921 T/D 169 C 16 17 1 STM2 2 o 209 C KERO : 1,333 T/D 21 22 1 STM3 2 o 265 C LGO : 3,822 T/D CRUDE : 21,000 T/D 15oC 268oC 26 28 STM4 RESIDUE : 11,375 T/D

  14. CDU: Problem Solution • LSR D86(95) controlled by Distillate (Residue) rate • HSR D86(95) controlled by HSR flowrate • Kerosene D86(95) controlled by Kerosene flowrate • LGO D86(95) controlled by LGO flowrate • Runback to Flash zone (overflash) controlled by furnace duty

  15. Modeling a U-type Tower: The Tower has: • A partial condenser • Three coupled side strippers • U-type tower has no pump around side coolers. File name : U-type.bkp

  16. Process Flowsheet for a U-type Crude Distillation Column

  17. Three side strippers

  18. Steam Conditions for side strippers & main fractionator

  19. Adding the CDU to the Flowsheet • In the Model Library, click the Column tab. • Select the unit operation model, PetroFrac, to place in your process • flowsheet. • In this case, you should select the PetroFrac icon CDU10F. • Place the CDU10F icon in the flowsheet. Name the block CRUDE. • Click the Material Stream icon on the left side of the Model Library. • Point a blank part of the process flowsheet window where you want the • feed to originates and click once. • For the CRUDE stream, first connect it to the bottom of feed port and then • Drag it to the desired location in front of the feed furnace.

  20. Streams and Corresponding Ports

  21. Specifying Properties

  22. Entering Stream Data for CRUDE

  23. Specifying STM1 to the Upper Side Stripper

  24. Specifying STM2 to the Middle Side Stripper

  25. Specifying STM3 to the Lower Side Stripper

  26. Specifying STM4 to the Main Column

  27. Specifying the Atmospheric Column • The bottoms (Atmospheric residue) flowrate is an estimate. • This value will be manipulated to achieve the desired ASTM 95% • temperature for LSR stream.

  28. Specifying the Atmospheric Column (2)

  29. Specifying Furnace Feed Convention

  30. Enter the following pressures using the Top/Bottom View: • Select the Single stage flash Furnace type in the Furnace sheet. • Specify a StdVol Fractionaloverflashof 0.03 and a Furnace • pressure of 2.9Kg/cm2.

  31. Specifying for Stripper S-1

  32. Specifying for Stripper S-2

  33. Specifying for Stripper S-3

  34. Specifying Mass Flowrate for Each Sidecuts

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