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Technical Paper


www.ireng.org


WEAR & TEAR IN (L/R)-FCCU PART 1


by Ing. W.A.J. Kastelic W/mKastelic Refractories Services


Preface


Damages to erosion-resistant refractory linings in FCCU Regenerator & Reactor sections are a well-known and recurring phenomenon, especially in the reactor/stripper and cat. piping, i.e. in the ‘black’ section, due to spalling and to a lesser extent, erosion. Although refractory failure is in most of the cases not the prime reason for an intermediate shutdown, there is generally a considerable amount of damage observed when the equipment is opened for inspection.


In the first part of this article an introduction is given about the principles and types of wear as they appear regularly in these types of units with fluidised bed circulation of an abrasive medium, like sand or catalyst.


In the second part the effect of erosion on refractory linings is given followed by an overview of erosion-resistant refractory linings particularly for (L/R)-FCCU’s.


Figures, photographs and tables are shown for explanatory purpose and illustration only and shall not be used for (re)production or presentation outside the content of this article.


16


1 Introduction


Damages to erosion-resistant refractory linings in FCCU Regenerator & Reactor sections are a well-known and recurring phenomenon, especially in the reactor/stripper and cat. piping, i.e. in the ‘black’ section, due to spalling and to a lesser extent, erosion. Although refractory failure is in most of the cases not the prime reason for an intermediate shutdown, there is generally a considerable amount of damage observed when the equipment is opened for inspection.


In the Regenerator section generally little repair is required on the vessel’s insulating refractory lining, but frequently on the air-grid which besides frequent erosion of the air-nozzles, often suffers from cracking of main headers and arms. Erosion-resistant refractory linings are increasingly applied to combat this cracking due to thermal cycling.


A large part of the observed damages are related to the regenerator and reactor cyclones, in particular in the gas-outlets by erosion of the non-lined outlets, the cross-overs and the connection to the plenums by cracking mainly due to thermal cycling.


ENGINEER THE REFRACTORIES March 2019 Issue


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