The aim of present work is to expand and enhance the performance of the new plate design
that previously introduced by the author. The main notice for the first plate design introduced
in the first part of this study is the lake of swirling closed to the walls. Increasing the number
of ejectors from 5 to 14 ejectors by adding a new circumferential row with 9 new ejectors
could improve the rate of swirling process near the wall. Accordingly the diameter of the bed
has increased from 46.9 mm to 150 mm. A cold run study was conducted to test the new
distribution plate. The bed was tested on cold conditions with two sizes of sand grains, 300
m and 600 m at different flow rates of a mixture of gas and air.
The results showed that the new modification for the distribution plate that introduced
previously resulted in the same advantages of good mixing and swirl flow, fast ignition
response and no region for de-fluidization in the center of the plate beside avoiding the little
settling on the bed bottom previously obtained due to the lack of the number of ejectors close
to the walls.