Catalyst ceramic ball packing issue
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For reactors equipped with a catalyst, a certain amount of ceramic balls are generally placed on and below the catalyst, and the patent holder specifies the required filling height for these ceramic balls. What effects will occur if, in actual installation, the filling height of the ceramic balls is higher or lower than what specified by the patent holder? Generally, there are several layers of ceramic balls on the catalyst, such as 50/25/12/6. What impact would it have if, during actual installation, these ceramic balls were mixed together, that is, the 12mm and 25mm balls were placed together without being separated into distinct layers?
The larger ones are placed at the bottom, with the diameter gradually decreasing; this is done to prevent the smaller-diameter ones from escaping through the holes in the sieve plate. Mixing them together affects the surface area and the amount that can be packed. In industrial production, this has little impact, but it’s different in the laboratory
Magnetic balls are used for heat exchange; their different sizes are intended to adjust the pressure difference, and they also serve to prevent small particles from falling through
This post was last edited by ylb913 on 2016-4-14 07:24. Pay attention to the gaps between the grids: for example, the grid corresponding to a magnetic ball with a diameter of 25 at the bottom has a gap of 19 mm, while the grid corresponding to a magnetic ball with a diameter of 30 at the bottom has a gap of 24 mm. Since it’s difficult to make the grid too dense, large magnetic balls need to be placed at the bottom first. Then, for the catalyst layer in your bed, it consists of granular catalysts with a diameter of 4 mm; to prevent these catalysts from falling through, small magnetic balls with a diameter of 16 or 10 mm are also placed between them. Of course, there is a mesh between the magnetic balls and the grid, but this also depends on the density and strength of the mesh. In many cases, the strength of the mesh isn’t very high; when the small magnetic balls are placed at the bottom, they can push against the mesh, causing it to bulge and deform in the gaps between the grid bars. Therefore, large-diameter magnetic balls should be installed at the upper part of the mesh first. The particles of the catalyst are not uniform, and it’s inevitable that some of them are smaller than the openings in the mesh. The purpose of using magnetic balls is to prevent the catalyst from falling through, so magnetic balls with a smaller diameter should be used beneath the catalyst.
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