Reasons for catalyst fragmentation in the catalytic regenerator
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What causes catalyst fragmentation in the catalytic regenerator? Can changes in the number and orientation of the openings on the main air distribution plate, without any change in the diameter of those openings, lead to catalyst fragmentation?
1. The catalyst is crushed due to temperature, moisture, and mechanical impacts during the fluidization process. 2. The main air distribution plate changes the number of openings, resulting in variations in flow velocity within a certain range at the nozzle outlets; these micro-level disturbances to the catalyst inevitably lead to changes. If the catalyst is very fragile, its tendency to be crushed will also change； When the direction of the nozzle changes and the new jet direction approaches an obstacle, the main airflow carrying the catalyst hits the obstacle, and the tendency for fragmentation also changes. 3. However, to determine the extent of these changes, data for comparison is needed; it is therefore not possible to quantify the degree of fragmentation here.
Changes in orientation and irregularities can cause the catalyst to collide and break apart.
Have you encountered this situation? All the openings that were originally facing the wall of the container were blocked, but this time some of them remained unblocked
1. The exit flow velocity at the nozzles of the distribution tube can reach several dozen meters per second; the gas ejected from nozzles that are close to or positioned against the vessel walls or internal components carries catalyst with it, which causes erosion and wear on these walls and components. 2. Erosion and wear are also related to time – as the operating cycle of catalytic processes becomes longer, the probability of wear-related failures increases. Therefore, sealing off the nozzles that are close to the vessel walls contributes to improved safety. 3. A set of distribution tubes contains hundreds of nozzles, and only 1–2% of them need to be sealed off; this does not have a significant impact on the flow velocity of the remaining nozzles nor on the pressure drop across the distribution tube