Study on Particles Residence Time Distribution in Low-temperature Chlorinator
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摘要: 利用攀钢含钛高炉渣低温氯化炉冷态模型, 采用电导率法对脉冲示踪粒子进行试验研究, 分别考察了内部挡板、物料流量、表观气速等操作参数对低温氯化炉中颗粒停留时间分布 (RTD) 的影响。结果表明, 挡板纵向切割流化床相对空间, 消除短路, 有利于颗粒与流化气的充分混合, 双挡板条件下, 碳化渣颗粒在流化床内RTD更为集中 (方差σt2由0.67明显降低至0.5);加料速率由1.9 g/s减小至1.1 g/s, 物料平均停留时间延长一倍, 碳化渣反应时间增加。表观气速增大至0.15 m/s时, 虽然在一定程度上弱化了碳化渣停留时间分布的集中性, 但返混强化了颗粒与气体的接触和反应, 保证了流化状态, 有利于提高碳化渣氯化效率。Abstract: Based on the cold model of low-temperature chlorination furnace for Pangang titanium-bearing blast furnace slag,the conductivity method was employed to research the pulse tracer particles,and the effects of internal baffles,feed rate and apparent gas velocity on the particles Residence Time Distribution (RTD) in the low-temperature chlorination furnace were investigated. The results show that the baffles lengthwise separate the internal space of the furnace to eliminate short circuits,which is beneficial to efficiently mixing between the particles and fluidized gas. The RTD of carbonized slag in the furnace is more concentrated with double baffles (variance σt2 reduces to 0.50 from 0.67). When the feed rate decreases from 1.9 to 1.1 g/s the average residence time of the material doubles and the reaction time of carbonized slag increases. With the apparent gas velocity increased to 0.15 m/s,the concentricity of RTD for carbonized slag is weaken to some extent,but the contact and reaction between the particles and gas is enhanced by back-mixing which insures the fluidization conditions of the materials and is in favor of improving the chlorination efficiency of carbonized slag.
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Key words:
- titanium-bearing BF slag /
- carbonized slag /
- chlorination /
- fluidized bed /
- RTD /
- pulse method
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