Operation status of the slurry system
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May I ask what density level everyone at Haiyou controls for the slurry? To what extent does the density of the slurry affect the long-term operation of the slurry system? What is the dosage of the slurry scale inhibitor?
In typical catalytic cracking units, the solid content of the slurry is controlled at 6 g/l. An excessive solid content can affect the flow rate of the slurry, and it tends to accumulate in areas with low flow rates ； It will also increase the wear and tear on the equipment, and it will have an impact on the distribution of the products. Therefore, it is necessary for us to identify the reasons for the high inherent content and adjust the operations in a timely manner to reduce it. The amount of scale inhibitor used generally depends on the solid content and other relevant conditions, but it is advisable to understand the principle by which the scale inhibitor reduces the solid content.
We keep the density of the slurry at or below 1080; if the density is too high, the viscosity of the slurry increases, which can affect the safe and stable operation of the facility. The amount of scale inhibitor we inject is 30 ppm
Density < 1150, antifouling agent amount around 30; pay attention to the requirements regarding the heat exchangers in the slurry system, as well as the viscosity of the slurry and the steam generation level
Has the dosage of the scale inhibitor ever exceeded 100 ppm? Is the dosage of the scale inhibitor adjusted frequently?
For long-term, continuous injection, this substance is relatively expensive, so adjustments are generally not made.
Is 30 ppm the dosage amount for the raw material?
We usually operate below 1070; the designed dosage of the scale inhibitor is 100 ppm, but we generally add it at around 70
Yes, the denominator is the processing volume of the feed oil for the unit
I was wondering, with such a high density control for rewards and such a low dosage of scale inhibitors, how is the long-term operation of the slurry system?