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制粒准颗粒的粒度组成是影响烧结生料层透气性的主要因素之一。通过配料操作、制粒工艺优化等措施能够在一定程度上调节制粒后准颗粒的粒度分布。为探讨准颗粒级配模式对烧结生料层床层结构的影响规律,对制粒准颗粒在烧结杯内的堆积行为进行了数值仿真。首先,在实验室条件下对1种烧结混合料进行了变含水量的常规制粒实验,实验结果表明:调节制粒含水量可以显著地改变准颗粒群的粒度组成,生料层透气性也随之得到调整。随后,基于刚性球体颗粒模型,运用离散单元法对准颗粒群的堆积行为进行了数值仿真。研究发现:准颗粒的级配模式对烧结杯堆积床层的模拟空隙率有显著的影响,在颗粒不发生显著塑性变形时,仿真所得的稳态空隙率与实验所得的生料层透气性指数有很好的线性正相关关系。
The particle size composition of the granulation quasi-particles is one of the main factors affecting the permeability of the sinter bed. Through the ingredients operation, granulation process optimization and other measures to a certain extent, regulate the particle size distribution of the quasi-particles after granulation. In order to investigate the effect of quasi-particle gradation on the bed structure of sinter bed, the numerical simulation of the sedimentation behavior of granulated quasi-particles in the sintering cup was carried out. First of all, a conventional granulation experiment of changing the water content of one kind of sinter mixture under laboratory conditions was carried out. The experimental results show that adjusting the granulation water content can significantly change the particle size composition of the quasi- Adjusted accordingly. Subsequently, based on the rigid spherical particle model, the discrete element method was used to simulate the stacking behavior of particle swarm. The results show that the quasi-particle grading mode has a significant effect on the simulated void fraction of the packed bed of sintering cups. When the particles do not show any significant plastic deformation, the steady-state void ratio obtained by simulation and the permeability index There is a good linear positive correlation.