Study on Resistance Characteristics of Embedded Counterflow Column Type Wind Caps in Suspension Roaster
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摘要:
采用床层压降—气量法，系统地开展了内嵌逆流柱型风帽在悬浮焙烧炉运行过程中的阻力特性研究。通过冷态实验探索了风帽数量以及风帽芯帽管小孔数量对内嵌逆流柱型风帽布风装置阻力特性的影响，并根据相似理论推导出不同温度条件下内嵌逆流柱型风帽的阻力特性。结果表明：内嵌逆流柱型风帽布风装置的阻力随着风帽数量和风帽芯管小孔数量的增多而减小，颗粒临界风量随着矿石颗粒粒度的增大而增大，而矿石床层高度对临界风量的影响较小，研究结果为悬浮焙烧炉工业化生产过程中操作参数的设计及优化提供了理论和数据支撑。
Abstract:The resistance characteristics of the inline counterflow column type wind caps during the operation of suspension roaster was systematically investigated based on the bed pressure drop-air flow method. The influences of air flow and numbers of small holes in the core cap tube on the resistance characteristics of the air distribution device with embedded counter-current column type wind caps were explored by cold tests, and the resistance characteristics of the embedded counter-current column type wind caps under different temperature conditions were deduced according to similar theory. The results showed that the resistance of the air distribution device with embedded counterflow column type wind caps decreased with the increase of the number of wind caps and the number of small holes of the wind cap core tube. The critical airflow increased with the increase of ore particle size while having a small influence on the ore bed height. The research results provide theoretical and data support for the design and optimization of operating parameters in the industrial production of suspension roasting.
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表 1 实验物料的物理性质
Table 1. Physical properties of the test materials
固体物料 粒度
/mm体积平均
粒径/mm真密度
/(kg·m−3)表观密度
/(kg·m−3)堆积密度
/(kg·m−3)A −0.074+0.053 0.061 3250 1530 1750 B −0.106+0.074 0.093 3310 1680 1360 C −0.15+0.106 0.141 3894 2560 1890 D −0.18+0.15 0.166 3562 1890 1627 
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表 2 不同温度下的雷诺数
Table 2. Reynolds number at different temperatures
温度/℃ 400 500 600 700 800 900 1000 雷诺数 2346.59 1867.75 1533.46 1284.79 1100.56 954.44 836.83
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