铁矿石烧结终点的优化控制

Optimal control of sintering burn through point

根据铁矿石烧结过程的特点，提出了烧结终点的长期和短期控制策略．长期控制根据原始料层透气性以及垂直烧结速度的状态，通过调整料高或机速实现；短期控制通过调整机速，稳定废气温度上升点实现．采用自定中心、非线性量化、控制规则自调整等方法实现了模糊控制算法的自适应．提出了用垂直烧结速度描述烧结过程透气性的观点，采用系统辨识的方法建立了垂直烧结速度的预报模型．应用结果表明：所建预报模型的准确率较高，达95％以上；系统的使用可使烧结过程主要状态参数（烧结终点位置、温度、大烟道温度等）的波动降低18％～29％．

According to characters of iron ore sintering process, long and short-term control strategy of sintering burn-through point is put forward. The long-term control was realized by adjusting bed high according to status of pre-ignition permeability and vertical sintering speed. The rising position of gas temperature was stabled by adjusting pallet speed, and the short-term control was carried out. The self-adaptive fuzzy control algorithm was achieved by using auto-center, non-linear quantification, and self-adjust rules and so on. The viewpoint of using vertical sintering speed represent bed permea- bility is put forward. The prediction model for vertical sintering speed was established through system identification. The industrial application of the system shows that the accuracy of model is over 95 %, and the fluctuation of main state parameters of sintering process, such as burn through point, burn through temperature and temperature of main duct, can be reduced by 18-29 %.