When converting from light oil to processing Marri heavy crude oil in a atmospheric and vacuum distillation unit, what are the things to keep in mind? Give me a plan.
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Please develop a plan from an all-round perspective, in a comprehensive way. Thank you
Do you produce asphalt? It might have a relatively large impact on heat exchange
If the amount of slag removed increases, can the flow rates of the bottom pump and the slag-reduction pump keep up? The load on the vacuum furnace will increase, while the gas-phase load in the upper part of the tower decreases; the trays need to be modified, otherwise stages 1 and 2 are prone to becoming under vacuum.
Without seeing your crude oil evaluation data, it’s impossible to accurately determine the difficulties in operation; it would be best to send over an analysis of the crude oil evaluation
When producing marae, the heat exchangers used in atmospheric distillation are basically useless, and the side streams from the atmospheric column are also largely unnecessary. If the temperature of the feed entering the atmospheric column is very low, the load on the vacuum column becomes very high. Therefore, the heat exchange areas need to be reorganized in order to raise the temperature of the residue. However, this increases the load on the vacuum column and the bottom pump; thus, reducing the processing volume slightly can still allow production to continue! It’s best to modify the heat exchangers, pumps, and so on.
If you’re not afraid of extra costs, it’s okay to use a atmospheric pressure furnace as well, but the processing volume shouldn’t be too large, and the outlet temperature of the furnace shouldn’t be too high. We have managed to get the outlet temperature of the Ma Rui furnace at 370–375 degrees, with a soft switching point above 70
The heat exchange process needs to be modified; the opening ratio of the trays must be recalculated, and some pumps need to be replaced, otherwise the operation will not be optimal
If the equipment has high operational flexibility, there should be no problems with production; the main issue is corrosion protection for the equipment and pipelines. It is best to carry out material upgrades before starting production.
Have a design institute do the calculations to determine what the proportion of heavy components is. First, calculate the product yield and the operation conditions of the tower (especially the load on the atmospheric pressure tower top). Second, assess whether the heat exchange network meets the requirements. Third, conduct calculations for the heating furnace. Fourth, perform hydraulic calculations for the trays in the atmospheric pressure tower. Fifth, carry out hydraulic calculations for the packing in the vacuum tower, and so on. You definitely still need a design institute for these