Factors affecting catalytic yield
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This post was last edited by Final Fantasy on 2010-8-23 at 20:10. One month after the unit started operating, the yield suddenly decreased, the amount of slurry increased significantly, and the volume of dry gas also rose. Upon analysis, the factors affecting yield include: 1. Catalyst poisoning, or a significant decrease in catalyst activity ； 2. Changes in the properties of crude oil ； 3. Lift tube coking ； 4. Leakage in the crude oil-slurry heat exchanger, causing crude oil to enter the slurry ； It's just my personal opinion; please feel free to add yours.
Decreased catalyst activity, heavy metal contamination
I believe it is mainly caused by changes in the properties of the raw materials, which lead to variations in the yield of the product as well as a decrease in catalyst activity; and this reduced catalyst activity in turn causes further changes in the product yield.
What’s said on the 2nd floor makes sense – a large amount of slurry indicates a low conversion rate, but at the same time, a large amount of dry gas presents a contradiction. If the hydrogen content in the dry gas increases significantly, it’s likely that the catalyst is poisoned. Additionally, all of the above 4 points mentioned by the owner can be checked through testing to determine whether they can be ruled out.
To improve the yield in catalysis, I think several points need attention: 1. Increase the conversion rate, as it is influenced by factors such as activity, raw materials, reaction temperature, and the ratio of catalyst to feedstock. 2. Control the degree of thermal cracking in order to reduce secondary thermal cracking reactions. 3. Minimize losses in the separation system； Most enterprises lack the necessary distillation precision; the oil slurry contains diesel, and the dry gas contains liquefied gas ； 4. Reduce processing losses. 5. Reduce dry gas yield and reduce coke yield.