Online tower cleaning in catalytic fractionation towers
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Please discuss an old topic: how to perform tower washing in an online fractional distillation column
My unit has a fresh water line from the crude gasoline pump; the flow rate and temperature are carefully controlled, and the temperature at the top of the tower must not be too low during tower washing. Since the diameter of the fresh water pipeline in my setup was small during design, it was later changed to a softened water pipeline, which not only ensured an adequate flow rate but also increased the temperature, thereby reducing the time required for tower cleaning.
The top circulation pump is stopped; water is then pumped in from the cold return stream at the inlet of the top circulation pump. The presence of water at the inlet of the top circulation pump indicates that enough water has been pumped in; otherwise, cleaning cannot be achieved properly. Then analyze the CL-ion content; when it is close to normal, stop cooling and resume recirculation, and restart the top circulation pump.
Our company has a fresh water line connected to the crude gasoline pump; in order to facilitate tower cleaning, the pump outlet was connected to a cold reflux line during the renovation. The water flow rate is controlled using frequency conversion. After water injection, it is important to monitor the temperatures of various reflux streams. If the top circulation temperature falls below 110 degrees, water injection is stopped at the outlet of the top circulation pump, and the cutoff temperature is carefully controlled to prevent excessively low temperatures from affecting the stability of the system. When the diesel extraction temperature drops below 150 degrees, water injection is stopped at the diesel pump. (In all cases, the backup pumps are used for stopping water injection.) Water samples are analyzed every half hour to check for chloride levels
Deoxygenated water at 100 degrees is connected at the return point of the top circulation system; due to its high temperature, scaling does not occur, and there is no need to shut down the top circulation system
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We drain water at two locations: the top circulation pump and the diesel pump. The amount of water used should generally not be excessive, and it’s best to keep the duration under one hour. If there is no decrease in reaction efficiency, it takes about 4 hours to produce defective products, which makes it quite economical.