hydrocracking
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Reasons for the large radial temperature difference in the reactor
A large radial temperature difference generally indicates flow deviation, which may be caused by uneven packing density of the catalyst initially, or it could be a problem with the inlet distributor. Flow deviation leads to the formation of hot spots; the high pressure difference results in an excessive residence time for the material, preventing the reaction heat from being removed, and this can easily cause excessive temperatures. It is recommended to monitor this closely.
1. Differences in height among the thermometers, or inaccuracies in measurements. 2. Uneven catalyst loading, which leads to uneven flow of the material. 3. Low processing volume, or uneven distribution by the distributor
1. Collapse of the catalyst bed 2. Formation of a layer on top of the catalyst bed 3. Severe scaling on the upper distribution plate 4. Serious damage to the bed support structure 5. Significant changes in process parameters such as feed rate and recycled hydrogen volume
First is the issue of feed rate and recycle hydrogen volume, followed by uneven catalyst distribution and bed damage
1. Differences in height among the thermometers, or inaccuracies in their readings. 2. Uneven catalyst loading, which leads to uneven flow of the material. 3. Low processing volume, or uneven distribution by the distributor. 4
1. Differences in height among the thermometers or inaccuracies in measurements lead to errors. 2. Uneven catalyst loading results in uneven flow of the material. 3. It is caused by a low processing volume or uneven distribution by the distributor. 4. The catalyst has localized coking
The catalyst bed collapses, a layer forms on the top of the catalyst bed; the distribution tray at the top becomes severely fouled, the support structure of the bed is heavily damaged, and process parameters such as the feed rate and the amount of recycle hydrogen experience significant changes