How to improve the quality of oil washing
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Process parameters: oil-poor temperature 27–29, gas temperature 21–23, oil-rich temperature 180–185, superheated steam temperature 400–450, top temperature of the debenzing tower 90–91, bottom pressure of the debenzing tower 31–32. These parameters remain stable, but the quality of the washed oil is getting worse and worse. The distillate yield at 270 degrees is around 30, while it is 85–88 at 300 degrees. How can the quality of the wash oil be improved as quickly as possible?
Enhance the operation of the regenerator, using parameters such as steam volume, liquid level, temperature, and pressure. Through measures, the distillate yield of recycled washing oil at 270 degrees is increased to over 70%.
Multiple batches of residues are present; the washing oil from the analysis cycle is used to ensure that all parameters remain within the specified range. If you carry out tar processing, the washing oil is not lost in this process
Could you explain in detail how process parameters enable control?
Without tar processing, how can the oil washing parameters be kept within controlled limits? Which metrics should I change?
Reduce the pressure in the benzene removal tower and increase the slag discharge volume. You get it:lol
The distillate volume of the washing oil at 270°C is already very low; there might be a problem with the regenerator. Check the slag discharge system (the amount and frequency of discharge should be defined). For now, the only option is to increase slag discharge (it’s possible to discharge slag along with oil) and use more fresh washing oil to ensure the quality of the circulating oil; otherwise, more problems will arise later on.
How can we actually improve the operation of the regenerator? Let’s discuss this in detail
Due to environmental concerns, large-scale slag discharge is not feasible
In my opinion, it is first necessary to test the quality of the newly processed oil; there isn’t much room for improvement in terms of the control parameters. The number of times slag is removed from the regenerator should be increased, and some newly processed oil should also be added. The main goal is to improve the quality of the circulating oil first, with frequent slag removal being necessary in subsequent operations
Based solely on the analysis of eluted benzene, it is because the gas temperature is too low; in other words, the oil-poor gas temperature is too low. The gas temperature should be raised to 27 degrees. If analyzed from the entire gas system, it is likely that the control of parameters such as the pre-cooler, electrostatic precipitator, and final cooler at the beginning is not adequate.