What is the pressure of the feed oil before it enters the catalytic cracking nozzle?
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The crude oil pump in our unit is a variable-frequency pump; currently it operates at a fixed frequency. Can the pressure of the crude oil still be maintained if the frequency is changed? Does it affect nozzle feed atomization? Does it affect the linear speed of the heat exchanger ahead?
We are using a variable-frequency pump at the moment, with an inlet pressure of just over 6 kilograms.
Does the line speed of the heat exchanger have an impact? Is the feed rate subject to large fluctuations?
Are there any flow deviations in the six nozzles?
Is the power frequency flow controlled by a control valve? Variable frequency is easy to operate; once the processing volume is set, and the amount of material entering the nozzle is determined, I don’t think there are many changes within the system
There is basically no impact; the nebulization effect and the amount of steam are influenced by many factors such as the temperature of the raw materials and pressure.
Personally, I think that with such a large diameter, that much feed material, and only a few nozzles, the linear velocity in the heat exchanger is necessarily high. Whether there will be flow fluctuations depends on the condition of the pump. The atomization effect is determined by factors such as the nozzle model, the amount of steam used to enhance atomization, and the catalyst circulation. If the deviation in flow is significant and no noticeable improvement is seen after adjustment, it may be caused by catalyst-induced wear on some nozzles in the heavy oil reprocessing section, or it could be due to uneven catalyst circulation resulting in flow deviations.
The operating condition curve of the nozzle should be referred to; a pressure gauge should be installed near the nozzle’s pipeline to measure the pressure. Observe the reaction fluidization phenomenon in the days following the modification, and measure the pressure drop between the upper and lower sections of the riser before use to note any changes