Operation at normal pressure and high temperature
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Is it harmful to the equipment to operate it at low pressure and high temperatures of 420-430 degrees? What is the difference between the regular slag produced at 420-430 degrees and the asphalt obtained under reduced pressure? How to modify the equipment? I hope experts can give some guidance!
Normal depressurization doesn’t reach such high temperatures; this is already coking
According to \"Crude Oil Distillation Processes and Engineering,\" crude oil is heated to 350–370°C in a atmospheric heating furnace before being fed into an atmospheric distillation column for atmospheric distillation. The heavy oil obtained at the bottom of the atmospheric column is then heated to 390–420°C in a vacuum heating furnace and fed into a vacuum distillation column for vacuum distillation.
Can such a temperature be achieved without applying reduced pressure?
Are there any other methods without decompression?
At normal pressure and operating at high temperatures of 420–430 degrees, it is likely to have some impact on the normal-pressure distillates as well, due to thermal cracking. I have never worked in a vacuum distillation unit, so I don’t know what method can be used as a substitute for vacuum.
Basically, it’s impossible, because your atmospheric pressure boiler has already been designed in such a way that it’s impossible to reach 420 degrees. If it were possible to reach 420 degrees, then the boiler tubes would still need to be filled with boiler water or steam in order to prevent coking of those tubes; use a solvent for asphalt removal instead
The planned processes for reducing pressure and viscosity are too cumbersome; the procedures are overly complex. As a result, solid asphalt is produced, many people are required to work on it, and the expected profits are not satisfactory. Therefore, we are looking for alternative solutions
Prevent hot cracking, coking, and blockage of furnace tubes as well as other subsequent units and components
It seems to be intended to remove impurities more thoroughly. However, I’m not sure what impact operating at normal pressure and high temperatures of 420–430 degrees will have on the yield; in my opinion, this approach is not recommended
With such modifications, isn’t the thermal efficiency of the furnace too low? Also, is the heat recovery rate at various temperature levels reasonable? The main concerns are safety and energy consumption; if crude oil has a high sulfur and acid value, and corrosion protection is inadequate, any leakage of such oil with a viscosity over 400 can lead to fires. The safety costs are too high; it’s better to build a pressure relief system instead