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过程工程学报 ›› 2020, Vol. 20 ›› Issue (2): 158-166.DOI: 10.12034/j.issn.1009-606X.219203

• 流动与传递 • 上一篇    下一篇

竖冷设备结构的离散元法模拟优化

张雪宽1,2, 徐 骥2*, 孙俊杰3*, 张永杰4, 张正好3   

  1. 1. 中国石油大学(北京)化工学院,北京 102249 2. 中国科学院过程工程研究所多相复杂系统国家重点实验室,北京 100190 3. 上海梅山钢铁股份有限公司,江苏 南京 210039 4. 宝钢股份有限公司中央研究院,上海 201900
  • 收稿日期:2019-05-16 修回日期:2019-06-24 出版日期:2020-02-22 发布日期:2020-02-19
  • 通讯作者: 徐骥
  • 基金资助:
    国家自然科学基金委重大计划集成项目;中国科学院信息化专项课题;宝山钢铁股份有限公司项目;国家重点研发计划项目;前沿科学重点研究项目;挑战计划–国防基础科研科学挑战专题

Structure optimization of the vertically arranged cooler based on the simulation with discrete element method

Xuekuan ZHANG1,2, Ji XU2*, Junjie SUN3*, Yongjie ZHANG4, Zhenghao ZHANG3   

  1. 1. College of Chemical Engineering, China University of Petroleum, Beijing 102249, China 2. State Key Laboratory of Multi-phase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 3. Shanghai Meishan Iron and Steel Limited by Share Ltd., Nanjing, Jiangsu 210039, China 4. Baosteel Central Research Institute, Shanghai 201900, China
  • Received:2019-05-16 Revised:2019-06-24 Online:2020-02-22 Published:2020-02-19
  • Supported by:
    ;National Key R&D Program of China

摘要: 针对国内某钢厂竖冷设备,建立了基于离散元方法的模型,研究了竖冷设备中烧结矿石的装料过程。结果表明,由于原装料结构烧结矿石下落高度大,不同粒径烧结矿石下落速度相差明显,因此,在载料车倾料过程中出现小颗粒在下、大颗粒在上的偏析形态,同时缓冲仓内缺少限制颗粒运动的结构,导致排料过程中烧结矿石的偏析不断加剧。针对原设备的问题,首先将单一缓冲仓改为上下两层缓冲仓,上层缓冲仓用于降低颗粒下落高度,减小不同粒径颗粒的速度差;其次在缓冲仓底部引入斜栅栏结构,从而阻碍大颗粒运动,减小其运动距离,且限制了角落处的大颗粒再次进入缓冲仓出料口,避免加剧缓冲仓内的颗粒偏析。模拟结果表明新结构能有效改善竖冷设备内颗粒偏析。

关键词: 竖冷设备, 颗粒偏析, 离散元模拟, 结构优化

Abstract: The particle diameter distribution of sinters ore in vertically arranged cooler leads to serious segregation, which will greatly reduce the heat recovery efficiency of vertically arranged cooler. In order to solve the segregation problem of sinters ore, the simulation of the original vertically arranged cooler form domestic steel plant was conducted, which was based on discrete element method with graphics processing unit parallel computing. In the feeding process, the behaviors of sinter ore and their distribution of diameters were studied. The simulation results showed that the difference of movements of particles, which was caused by diameters of different sinters ore, increased with the height of sinters ore dropping from the bunker. Furthermore, larger sinters ore would aggregate in the corners and small sinters ore would aggregate around the point of falling sinters ore, which was due to the lack of internal structures restricting their movements, leading to more serious of segregation happen. Thus, a hopper and the inclined fences were introduced in the top and around the bottom of the storage bin, respectively. The hopper, which turned original design to two-layer storage bin, aimed to reduce the height and tailor the direction of the sinter ore dropping from the bunker, and thus the difference of the velocities and moving behaviors for the sinters ore of different diameters would be reduced greatly. The inclined fence aimed to restrict the movements of the largest sinters ore, so that their aggregation would be reduced. The simulation results of the new structure, including the distribution of the average diameter, the evolution of the segregation and the standard deviation of the average diameter of sinters ore, indicated that the new structure was advantageous in solving the segregation problem of sinters ore in the vertically arranged cooler.

Key words: vertically arranged cooler, particle segregation, discrete element method, structural optimization