Regenerator dendritic main air distributor

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With some distributors, severe wear on the branch pipes and nozzles occurs after less than one cycle, while others show no problems even after one cycle. Why is this? I want to do some research on this aspect. The dendritic main air distribution pipe consists of a main pipe and branch pipes; on both sides of each branch pipe there are sub-branch pipes perpendicular to it, and nozzles are welded onto these branch pipes. The design principle is to arrange the nozzles in a reasonable and uniform manner to prevent the airflow from directly eroding internal components such as the main pipe ； Wear-resistant linings are applied to the main pipes, branch pipes, sub-branch pipes, and nozzles to enhance wear resistance ； The actual main airflow velocity in the main ducts, branch ducts, and sub-branch ducts should be controlled at 20 m/s, while the pressure drop across the nozzles should be kept between 5 and 14 kPa. The outlet velocity of the nozzles should not exceed 30 m/s (is this figure correct?). The insertion depth of the branch ducts and nozzles should be increased, with a typical depth of 15–20 mm. The above is quoted from the literature — Zhang Xinguo. Design of Regenerators for Heavy Oil Catalytic Cracking. Petrochemical Equipment Technology. 2011. What is the situation in actual production? What are the design process and process parameters for distributors? I know too little about this area; there is a lack of information, and I hope to obtain more details through this forum.