This study investigated the segregation of organic (maceral) and inorganic (mineral matter or ash) contents of coal in an air stratifier after design modification in air distributor. The optimum angle of fluidization caused by air distributor was found using mathematical formulations of momentum balance on particles, and 30° of angle of fluidization was found to be the optimum angle of fluidization. Using coal feed with 32.64% ash content, the stratification time in the air stratifier with 30° angle of fluidization was estimated using phase distribution studies and the stratification time was found to be 12 min. The time at which concentrate has high organic phase as well as low inorganic phase and, simultaneously at that same time, the reject has high inorganic phase and low organic phase was fixed as the stratification time. Comparative studies with two different coal feeds were done for conventional fluidization and angular (30°) fluidization. The latter was obtained by design modification of air distributor and was found to enhance dry beneficiation of coal in air-pulsated stratifier.

本研究调查了在空气分配器中设计修改后的空气分层器中煤的有机（微分）和无机（矿物质或灰分）含量的分离。利用粒子动量平衡的数学公式找到了空气分布器引起的最佳流化角，发现30°的流化角是最佳流化角。使用灰分含量为 32.64% 的煤进料，使用相分布研究估算了流化角为 30° 的空气分层器中的分层时间，发现分层时间为 12 分钟。浓缩物具有高有机相和低无机相，同时筛渣具有高无机相和低有机相的时间固定为分层时间。对传统流化和角度（30°）流化两种不同的煤进料进行了比较研究。后者是通过空气分配器的设计修改获得的，并被发现可以增强空气脉冲分层器中煤炭的干选。