Issues with the addition of scale inhibitors to catalytic slurry
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I would like to ask everyone: are there any specifications or guidelines regarding the use of slurry scale inhibitors? For example, what conditions such as slurry density and the temperature at the bottom of the distillation tower must be met before it is unnecessary to use such inhibitors?
The amount of fluid to be added is determined by the solid content in the slurry. As for the temperature, it depends on the instructions for your product. Generally speaking, as long as you keep the temperature at the bottom of the tower within the specified range, there should be no problem!
Adding slurry scale inhibitors to the slurry system is a lengthy process, and there are no reference values available; only the China Institute of Petroleum Science has experimental data on this. Just add it as required by the additive manufacturer.
As the name implies, the main function of slurry scale inhibitors is to prevent scaling; the product must meet the temperature requirements of the slurry system in catalytic cracking units, and the dosage should be determined according to the guidelines provided by the manufacturer or research institutions. The most direct way to assess the effect is by observing the changes in temperature after the replacement; another method is to check for scaling on the heat exchanger after it stops operating. In any case, using scale inhibitors only provides a vague idea of the situation – you’ll have to judge for yourself.
As you said, the effectiveness of this slurry scale inhibitor can only be determined by checking the degree of scaling inside the equipment after it is opened during maintenance periods. We generally do not adjust the dosage used on a regular basis. The practice of adjusting the injection amount based on bottom temperature and slurry density, as suggested by the original poster, has never been implemented