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 couldimprove 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 thatthe 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.