Gwyn-type attrition apparatus

It should be noted here that the quantitative results obtained in a Gwyn-type attrition apparatus will in general depend not only on the cut size of the gravity separator but also on the entrainment and elutriation conditions in the main column. Werther and Xi (1993) compared, for example, attrition test results of the same catalyst obtained from three differently sized Gwyn-type units, one with column A having 50 mm ID and 500 mm height, one with column B having... 

Figure 14 Gwyn-type test apparatus suggested by Werther and Xi (1993) to investigate the jet-induced attrition separately from the bubble-induced attrition.

Figure 23 shows a comparison of the experimental data depicted in Fig. 22 with the calculation from the model equation (27). The required attrition rate constants Cj, K, and Q that describe the materials susceptibility to attrit in the respective regions have been determined by the corresponding attrition tests as described in Sec. 4.3. Cj has been determined from exactly that Gwyn-type test facility that is shown in Fig. 14 and was set to zero in the case of the porous plate distributor has been measured in a 200 mm ID Gwyn-type test apparatus, and Q has been determined from exactly that cyclone attrition-test procedure that is described in Sec. 4.3.4 using the equipment sketched in Fig. 11. The parameters me,in and dpc were measured in the apparatus sketehed in Fig. 21 under the assumption that mc n may be...

The resistance to attrition is an important characteristic of catalysts used in fluid beds (5). This mechanical property is evaluated with an air jet Gwyn-type-apparatus (17). 

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