不同载气供料对煤粉料仓下料的影响

煤粉料仓下料是气流床粉煤气化工艺中粉体供料单元的重要组成部分，其安全稳定运行具有重大的经济意义。在煤粉循环供料系统上，研究了以空气和CO₂为载气的气力输送供料对料仓内煤粉重力下料和通气下料的影响。研究表明，料仓内粉体的堆积或流化状态对后续粉体的流动行为影响明显。对于重力下料，CO₂供料后的重力下料过程中煤粉床层空隙率较高，下料流率较大；对于通气下料，空气供料后煤粉难以被CO₂气体流化，从而对应较低的下料流率。

Effect of feeding gas on hopper discharge of pulverized coal

Hopper discharge is one of the most important components in the entrained-flow gasification technology of pulverized coal. Safe and stabilized hopper discharge is of great economic significance. The effect of feeding gas, including air and CO₂ on hopper discharge was studied in the loop feeding system of pulverized coal. Both gravity discharge and aerated discharge were examined and analyzed. The behavior and flowability of powders would be influenced by their previous bulk or fluidized state. For gravity discharge, the pulverized coal fed by CO₂ showed a higher void and thus corresponded to higher discharge rate. For aerated discharge, the pulverized coal fed by air was hard to be fluidized by CO₂, resulting in lower discharge rate.