东北大学学报(自然科学版) ›› 2024, Vol. 45 ›› Issue (4): 523-529.DOI: 10.12068/j.issn.1005-3026.2024.04.009
• 材料与冶金 • 上一篇
傅大学1,2,3, 狄跃忠1,2, 王耀武1,2
收稿日期:
2022-11-08
出版日期:
2024-04-15
发布日期:
2024-06-26
作者简介:
傅大学(1986-),男,辽宁沈阳人,东北大学副教授.
基金资助:
Da-xue FU1,2,3, Yue-zhong DI1,2, Yao-wu WANG1,2
Received:
2022-11-08
Online:
2024-04-15
Published:
2024-06-26
摘要:
球团在还原罐内传热导致的温度梯度是限制皮江法还原反应的关键因素.本文采用数值方法研究了球团尺寸、装料方式、还原罐外壁温度等因素对床层温度分布、还原率分布的影响.结果表明:在球团直径为22.3 mm、还原时间相同时能够获得最大的还原率;生产过程中应尽量提高还原罐外壁温度;床层中心区域温度低,还原反应速率慢,反应滞后;通过中心留空的方法能够有效缩短还原周期,提高原料利用率;以单位体积、单位时间镁的产量为依据,对于内径为270 mm的还原罐,当中心留空区域的直径小于27 mm时,可获得最大生产效率.
中图分类号:
傅大学, 狄跃忠, 王耀武. 基于床层传热的皮江法炼镁过程优化[J]. 东北大学学报(自然科学版), 2024, 45(4): 523-529.
Da-xue FU, Yue-zhong DI, Yao-wu WANG. Optimization of Mg Production by Pidgeon Process Based on Heat Transfer in the Bed[J]. Journal of Northeastern University(Natural Science), 2024, 45(4): 523-529.
相关参数 | 数值 |
---|---|
球团密度ρ/(kg·m-3) | 2 100-420α |
球团比定压热容cp /(J·kg-1·K-1) | 955.02+0.1T |
球团导热系数λs/(W·m-1·K-1) | 0.14+0.000 288T |
反应(1)焓变ΔH/(J·mol-1) | 249 023.4-21.2T |
球团中镁的初始浓度c/(mol·m-3) | 17 500 |
表1 物理性质参数
Table 1 Physical parameters
相关参数 | 数值 |
---|---|
球团密度ρ/(kg·m-3) | 2 100-420α |
球团比定压热容cp /(J·kg-1·K-1) | 955.02+0.1T |
球团导热系数λs/(W·m-1·K-1) | 0.14+0.000 288T |
反应(1)焓变ΔH/(J·mol-1) | 249 023.4-21.2T |
球团中镁的初始浓度c/(mol·m-3) | 17 500 |
参数 | 时间/min | |||||||
---|---|---|---|---|---|---|---|---|
≤15 | ≤12 | ≤10 | ≤8 | >15 | >12 | >10 | >8 | |
温度/℃ | 1 050 | 1 100 | 1 150 | 1 200 | 1 050 | 1 100 | 1 150 | 1 200 |
动力学常数k/min-1 | 0.025 13 | 0.051 74 | 0.079 42 | 0.110 55 | 9.98×10-4 | 3.03×10-3 | 5.32×10-3 | 9.65×10-3 |
还原反应速率/min-1 |
表2 反应速率方程及相关动力学参数[19]
Table 2 Reaction rate equations and related kinetic parameters
参数 | 时间/min | |||||||
---|---|---|---|---|---|---|---|---|
≤15 | ≤12 | ≤10 | ≤8 | >15 | >12 | >10 | >8 | |
温度/℃ | 1 050 | 1 100 | 1 150 | 1 200 | 1 050 | 1 100 | 1 150 | 1 200 |
动力学常数k/min-1 | 0.025 13 | 0.051 74 | 0.079 42 | 0.110 55 | 9.98×10-4 | 3.03×10-3 | 5.32×10-3 | 9.65×10-3 |
还原反应速率/min-1 |
图6 还原罐在不同加热温度下内半径中点和还原罐中心点的温度与加热时间的关系(a)—内半径中点; (b)—还原罐中心点.
Fig.6 Relationship between temperature and heating time at inner radius midpoint and center point of the retort at different heating temperatures
图7 球团床层的温度分布(球团直径22.3 mm,还原罐加热温度T=1 473 K)
Fig.7 Temperature distribution in the pellets bed (pellet diameter 22.3 mm,heating temperature of retort T=1 473 K)
图8 球团床层的还原率分布(球团直径22.3 mm,还原罐加热温度T=1 473 K)
Fig.8 Reduction ratio distribution in the pellets bed (pellet diameter 22.3 mm,heating temperature of retort T=1 473 K)
体积 | 还原时间/h | 还原率/% | 最大生产效率 | ||
---|---|---|---|---|---|
kg·m-3·h-1 | |||||
V10+ | 2 | 73.53 | 5.42 | ||
V9+ | 2.69 | 71.88 | 16.47 | ||
V8+ | 2.94 | 66.29 | 23.72 | ||
V7+ | 3.32 | 65.23 | 28.39 | ||
V6+ | 3.74 | 65.00 | 31.91 | ||
V5+ | 4.09 | 64.74 | 34.23 | ||
V4+ | 4.36 | 64.61 | 35.73 | ||
V3+ | 4.55 | 64.59 | 36.51 | ||
V2+ | 4.68 | 64.45 | 37.15 | ||
V1+ | 4.72 | 64.45 | 37.14 |
表3 不同床层体积的最大生产效率
Table 3 Maximum production efficiency of different bed volumes
体积 | 还原时间/h | 还原率/% | 最大生产效率 | ||
---|---|---|---|---|---|
kg·m-3·h-1 | |||||
V10+ | 2 | 73.53 | 5.42 | ||
V9+ | 2.69 | 71.88 | 16.47 | ||
V8+ | 2.94 | 66.29 | 23.72 | ||
V7+ | 3.32 | 65.23 | 28.39 | ||
V6+ | 3.74 | 65.00 | 31.91 | ||
V5+ | 4.09 | 64.74 | 34.23 | ||
V4+ | 4.36 | 64.61 | 35.73 | ||
V3+ | 4.55 | 64.59 | 36.51 | ||
V2+ | 4.68 | 64.45 | 37.15 | ||
V1+ | 4.72 | 64.45 | 37.14 |
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