Part d : Operating conditions

16/ At which temperature you start to coke (only one answer): q 360°C q380°C q400°C q420°C

17 / The operating temperature in the reactor (riser) of a FCC is close to:

q300°C q400°C q500°C q600°C q700°C

570°F 750°F 930°F 1110°F 1290°F

18/ Operating pressure in a VGO Hydrocracker is close to (in bar abs):

q0.2 q2 q12 q20 qmore than 100

19/ Circle the process units belonging to the family of Thermal Cracking:

qFCC qVisbreaker qHydrocracker

qDelayed Coker qFlexicoker qCat Reforming

20 / in FCC, what is a CARBON BUILD UP?

PART E: INTERPRETATIONS OF FIGURES (CALCULATED OR MEASURED)

21/ Calculate the viscosity of the following Heavy Fuel Oil blend:

60 % wt Vacuum Residue (viscosity: 1600 cSt @ 100 °C)

40 % wt Flux (viscosity: 1 cSt @ 100 °C)

Viscosity of the HFO Blend = ______________ cSt @ 100 °C Is this blend on-specs for HFO: yesq

(4 points) (with HFO visco specs= 40 cSt @100°C) no q

22 / Calculate the KUOP of the FCC feed with the following analysis:

Specific gravity @15 °C = 0.890

Viscosity @ 50°C = 22 cSt

KUOP= _______________________ Is this feed paraffinic-type q or aromatic-type q?

(4 points)

23 / Calculate weight conversion at 430°F of FCC:

yields

(wt%)

gas = 5

C3 = 5

C4 = 10

LCN = 20

HCN = 25 with a cut point HCN / LCO of 450°F (distillation curves give 1%wt for 10°F between 400 and 500 °F)

LCO = 20

HCO = 10

Coke = 5

Weight Conversion at 430 °F = ___________________________

(4 points)

24 / The analysis of FCC flue gases gives the following results expressed as O2 / CO in volume percent

Indicate if it is a normal operation and if not what can be the consequences.

(8 points)

O2 / CO vol % what if, if no?

1% / 10 ppm: normal? yes q no q

5% / 10%: normal? yes q no q

10 ppm / 10%: normal? yes q no q

5% / 2 ppm: normal? yes q no q

Дата добавления: 2015-11-16