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Coker Gas Oil and Petroleum Coke: Vacuum Residue Delayed-Coked at about 920 °F (Gulf, US 3,071,535)
The black residue from the bottom of the vacuum tower still holds gas oil. Heated to about 920 °F and held in a coking drum, it cracks into lighter oils and coke; the coke stays on the drum walls and the oils go to a fractionator.
Result (Gulf's example, per day): from 17,000 barrels of vacuum bottoms, 7,890 barrels of coker gas oil boiling above 400 °F, 4,354 of coker naphtha, light gases and 925 tons of petroleum coke.
Source: Condrasky & Glazier, US 3,071,535 (Gulf, filed 1959), Table I. Not given: drum size, pressure, cycle time. Hot oil: fire risk. Picture drawn by Youblob.
Impuguke
1 day
Amabwiriza
1
1
Heat the vacuum residue to about 920 °F
Heat the vacuum residue to about 920 °F
Heat the vacuum reduced crude to a high temperature, about 920 °F in Gulf's example. Gulf charged 17,000 barrels per day.
Ibikoresho by'iyi ntambwe:
Ibisigazwa bya vacuum17000 parts by volumeIbikoresho bikenewe:
Ikigega cyo kubika peteroli
Pompe yo kwimura
Igikoresho cyo gukora amakara ya peteroli gitinza
Pirometero2
2
Hold it in a coking drum until it cracks
Hold it in a coking drum until it cracks
Pass it into a coking drum and keep it hot long enough to crack it into lighter hydrocarbons and coke. The coke forms on the walls of the drum.
Ibikoresho bikenewe:
Igikoresho cyo gukora amakara ya peteroli gitinzaPirometero3
3
Switch drums and cut out the coke
Switch drums and cut out the coke
When one drum is full of coke, switch to another and remove the coke from the first, mechanically or hydraulically. Gulf made 925 tons of coke a day.
Ibikoresho bikenewe:
Igikoresho cyo gukora amakara ya peteroli gitinza4
4
Fractionate the cracked vapours
Fractionate the cracked vapours
Fractionate the hydrocarbons from the drum: fuel gas, a propylene-rich C3 fraction (621), a C4 fraction (488), a C5 fraction (177), coker naphtha to about 400 °F (4,354) and coker gas oil above 400 °F (7,890). Gulf does not describe the fractionator. Ours: a fractionating still.
Ibikoresho bikenewe:
Ikinyuza umwuka gitandukanya5
5
Send the coker gas oil to the catalytic cracker
Send the coker gas oil to the catalytic cracker
The coker gas oil, all the liquid boiling above about 400 °F, is the charge Gulf sends to the fluid catalytic cracker.
Ibikoresho bikenewe:
Ikigega cyo kubika peteroliIbikoresho
1- 17000 parts by volumeUmwanya
Ibikoresho bikenewe
5- Umwanya
- Umwanya
- Umwanya
- Umwanya
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