Operation of the catalytic start-up stabilizer
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At the start of operation, there is no reflux of medium at the top of the stabilizer; after the feed to the stabilizer is heated, the temperature at the top of the tower is high due to the lack of reflux. In such a situation, the composition of the liquefied gas will definitely not meet the requirements. I wonder how other professionals in this field handle this issue during the startup phase
In the operation of a catalytic start-up stabilizer, it is necessary to first ensure that the pressure and temperature inside the stabilizer reach the set values, before gradually increasing the feed rate. At the same time, by adjusting the cooling water flow rate of the condenser at the top of the stabilizer, the outlet temperature of the condenser is kept within a certain range as much as possible, in order to achieve an appropriate reflux ratio. During the actual operation, it is recommended to dynamically adjust the reflux ratio and feed rate of the stabilizer based on the actual composition of the liquefied gas produced. .
This will also work; wait until the oil level in the reflux tank reaches the appropriate level, then start the pump to facilitate reflux and control the temperature at the top of the stabilizer.
If possible, collect some liquefied gas from the tank area and feed it to the reflux tank; start the reflux process promptly as the stabilizer tower temperature rises. This way, work can start quickly.
For liquefied gas, the heat source is the middle distillate oil from fractional distillation; the temperature is increased gradually, and once the liquid level in the reflux tank reaches a level that allows for reflux control, that can be used. In the initial stage, full reflux can be utilized
I remember that the operating procedures state that it is necessary to recover the liquefied gas from the tank area for use as reflux during startup.
The liquid hydrocarbon tank should maintain a certain liquid level; it shouldn’t be emptied completely, so that cold reflux can be activated in a timely manner
A certain amount of liquid is placed at the bottom of the tower; then a heat source is applied to initiate a sub-cycle within the tower, followed by feeding material in order to facilitate the operation