A dust-collecting device for dehydrogenation of paraffin hydrocarbons with a fluidized catalyst bed

The paper considers the problem of collecting solid particles in the production line with dehydrogenation of С4–С5 isoparaffins to isoolefins in a fluidized catalyst bed. The collecting of finely dispersed catalyst particles for dehydrogenation of paraffin hydrocarbons using a standard CN-15 cyclone and a new dust-collecting device (NDD) with arched elements was studied. The results of numerical simulation of CN-15 and NDD are reported. A comparative study revealed that NDD is more efficient than CN-15 in collecting the finely dispersed solid particles with the size below 20 μm. For NDD, determinate variations in the pressure and rate profiles, without any critical deviations, were observed. The gas flow rate through the arched elements of NDD was found to be stable, in distinction to CN-15, where high rates appear at the cyclone edges, thus raising the probability of dust breakthrough into the flow to be purified.