What is the maximum allowable figure of own use fuel and losses (OUL) in terms of percentage (vol%) of crude charge processed for a hydro skimming refinery?
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05/07/2010
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Ralph Ragsdale, Ragsdale Refining Courses, ralph.ragsdale@att.net
Also, in your analysis, consider all other units in the refinery. For example, the fuel and steam balance of a sulfur recovery unit varies significantly from crude to crude and will affect the overall fuel requirements of the refinery.
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05/07/2010
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keith bowers, B and B Consulting, kebowers47@gmail.com
100%.
The actual fuel consumption varies substantially and it a function of:
a) Crude oil(s) processed;
b) Diversity of products and their purity/quality
c) Degree of effluent treating--just minimum or complete 'California type better than natural.'
d) Power source for pumps and compressors--steam or electrical
e) Air or water cooling
f) climate
g) feedstock source for hydrogen manufacture
h) technology selected for each process employed.
A range of 3-7% by volume of total feed is appropriate with some outliers on higher end as Nelson Complexity increases. However the 'volume swell' processes of hydro-cracking and catalytic cracking can distort the calculations by making the 'apparent consumption' much lower that 'actual' consumption. The plant MASS balance should 'close' within +/- 1 % on a daily basis when all consumption is carefully counted.
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05/07/2010
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Ralph Ragsdale, Ragsdale Refining Courses, ralph.ragsdale@att.net
It would depend on the crude source. Simulate the crude distillation and the hydrotreater using computer models. Do it for several crudes. Observe the furnace duties. Set the atmospheric distillation overflash at 5% each time. Use a consistent cut point for the vacuum column. In that way, you will obtain a set of fuel and steam requirements for various crudes. Assume propane and butane are recovered and nothing is flared.
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05/07/2010
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Muhammad Muzaffar Malik Sarfaraz Ahmed Malik, BPPL, muzaffar_malik1@yahoo.com
2.5-3 v/v%
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