How is the density of the fresh catalyst tank in a catalytic unit determined?
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Dear sea friends, when measuring the volume of the fresh catalyst in the catalyst tank of your catalytic units and calculating the amount of catalyst contained therein, which density is used for the catalyst (expanded, settled, or compressed)? Why?
It must be the sedimentation density. The inflation density is inaccurate, making it impossible to achieve a compacted density.
Why can’t a high density achieve that? The majority are in a compacted state.
That’s just a rough simulation! It can be imagined that when a fresh catalyst is first added to the catalyst tank, its density may be close to the bulk density; over time, its density may approach the settled density. And will it come close to the compacted density after being pressurized? It is generally calculated based on the settlement density. It’s not easy to study this issue carefully either; the catalyst tank is too large, and it can’t be designed as a weighing type like an alumina tank. The ordinary methods of measuring volume and height are also imprecise; even if each bag of catalyst is weighed, it’s still not possible to know exactly how much is in the catalyst tank How much got away through the centrifuge? In short, it’s a rather imprecise figure, used merely as a rough method for management purposes.
What was said on the 5th floor makes sense. The so-called catalyst density is a value determined in the laboratory using various measurement methods; its primary purpose is for research, while less strict requirements apply in industrial applications. For example, the definition of compaction density is: the density calculated from the measured volume, after placing the catalyst in a measuring cylinder and vibrating it on a table several times until its volume remains constant. Inside the catalyst tank of the catalytic device, industrial air intended for loosening is introduced at the bottom of the tank; thus, even when pressure is present inside the tank, this loosening air continues to flow in continuously. As a result, the catalyst tank is not in a truly compacted state after being pressurized. Therefore, the compaction density cannot be achieved.
It relates to the bulk density; the main purpose of measuring the catalyst level in the tank is to keep track of the amount of catalyst that has been used, by comparing it with the amount present before it was loaded, so as to determine an accurate formula.
In industrial applications, bulk density is generally used. Compaction density is commonly used in laboratory studies but cannot be achieved in practical applications.