Erosion protection at the top of the riser
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This post was last edited by beyondbeiyang on 2017-1-22 at 10:46. Special elbows are installed at the top of both cracking lift pipes. This “elbow” is designed to rapidly change the direction of the feed vapor and catalyst mixture by 90°. At the same time, this elbow is designed so that the catalyst/oil-gas mixture remains above the catalyst buffer layer without affecting the riser. This design feature minimizes the likelihood of erosion in the riser, a critical area.
In conventional coaxial catalytic cracking, there is a wear-resistant elbow at the top of the riser.
In the vertical split catalytic cracking process, there isn’t such an elbow as described by the original poster; the top of the riser is simply a cover.