Temperature of hot hydrogen with oil in reformation pre-hydrogenation zone
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When we go out for training*, the temperature of the hot hydrogen with oil in the pre-hydrogenation zone is set at 260 degrees. Right? I think it needs to be over 300 degrees. And what determines the temperature of hot hydrogen with oil?
On my end, I keep it around 275. Under certain pressure conditions, the impurity content in the refined oil serves as a basis for determining the pre-hydrogenation temperature; the impurities include olefins, halogens, and metals
Do you mean the temperature of hot hydrogen with oil, from the furnace outlet to the reactor?
260 degrees is sufficient; we use 250 degrees, as long as the oil can fully vaporize at that pressure
When the temperature is high and there is oil present, the catalyst in its sulfided state can be reduced over time; therefore, it is advisable to keep the temperature of hot hydrogen with oil at 200°C and not to allow more than 24 hours to pass. Catalysts from different manufacturers also have different requirements
A oil temperature of 260 degrees is sufficient
Is hot hydrogen used for oil removal, meaning that feeding is stopped during pre-hydrogenation and hydrogen is used to remove the oil?
In our plant, the temperature for pre-hydrogenation with hot hydrogen and oil present is 180 degrees, and the process takes 4 hours. Excessively high temperatures pose a risk of catalyst reduction.
In our plant’s reforming unit, the temperature of the hot hydrogen containing oil during pre-hydrogenation is generally controlled by setting the outlet temperature of the heater at 280°C. If this temperature is too high, it can have an adverse effect on the pre-hydrogenation catalyst. It is also necessary to pay attention to the amount of hydrogen supplied, as well as to control the pressure in the high-pressure tank – this helps to ensure an adequate amount of hydrogen circulating in the system and prevents coking of the catalyst. The oil-containing principle states that the liquid level in the high-pressure tank should no longer rise; generally, this is achieved after about 4 hours.