烧结法氧化铝生料浆质量预测及应用研究

【作者】 孔玲爽；

【导师】 李劼；

【作者基本信息】 中南大学 ， 交通信息工程及控制， 2005， 硕士

【摘要】 配料作为氧化铝生产的第一道工序,配制的生料浆指标的好坏不仅直接关系到熟料质量的高低,而且对整个系统的碱平衡和水平衡具有极大的影响。然而,目前生料浆成分检测严重滞后且波动范围大,配比难于及时调整,从而导致整个生产流程的实时控制陷入被动。为此,研究如何建立生料浆质量预测模型从而实现配比的实时调整,对实现氧化铝生产过程的稳产高产、提高企业竞争力都具有重要意义。 本文以中铝集团中州分公司氧化铝生产过程为背景,着重研究了生料浆质量预测模型的建立和应用。首先,在分析氧化铝配料过程的基础上,确定了影响生料浆质量的主要因素,提出了先建立硅渣成分含量预测模型和碱液成分含量预估模型,然后再建立生料浆质量预测模型的分步建模法;紧接着采用BP神经网络模型对硅渣成分含量进行预测,同时根据碱液槽和碱液泵的工作情况,运用流体力学知识简化,建立了碱液预估模型,其中神经网络的输出为预估模型的输入;最后,在预估模型的基础上,建立基于物料平衡的机理模型,并采用GM(1,1)对机理模型的偏差进行补偿,从而实现了生料浆质量指标的实时预测。 在此研究基础上,开发了基于模型的生料浆配料优化专家系统,论文描述了系统的结构、功能和系统软件设计,着重介绍了数据通信、数据库和报表打印几个技术的软件实现。系统软件采用Visual C++6.0编制,实现了配比监控、配比优化、数据导入、数据管理和帮助等功能。现场运行结果表明模型满足配比优化计算的精度要求,整个系统实现了配比的实时控制,提高了生料浆质量,稳定了生产。更多还原

【Abstract】 The quality of raw slurry made up by blending, which is the first process of Alumina Production by Sintering Method, not only directly relates to the quality of the sintered grog, but also make great influence on the alkali and water balance in the whole system. However, at present it is difficult to timely measure and stabilize the quality of raw slurry, which complicates the adjustment of ratio and makes it is hard to achieve real-time control of the whole process of production. Therefore, how to implement real-time adjustment of the ratio by establishing the predictive model of quality for raw slurry, is significant for realizing steady and high production of alumina and enhancing the competitive power of enterprises.On the background of production process of alumina in Zhongzhou Brach China Aluminium, this paper mainly does research in the establishment and application of the predictive model of quality. Firstly, the key factors that influence the quality of raw slurry are acquired by analyzing the process of blending, then the multi-step modeling method is proposed. According to it, before the predictive model of quality for raw slurry is established, the predictive model of content for components of Ca-Al silicate slime and alkali liquor should be established. Secondly, the predictive model about Ca-Al silicate slime is established using BP neural networks(NN). Meanwhile according to the condition of alkali tanks and alkali pumps, the predictive model about alkali liquor, which is simplified by the principle of hydromechanics, is also established. One of its inputs is NN’s output and its outputs is the inputs of the mechanism model that is based on the material balance principle. Finally, in order to compensate errors of the mechanism model, GM(1,1) is put forward. The compensated model realizes the real-time prediction of raw slurry indices.On the research mentioned above, a blending expert system based on the predictive model of quality is developed in this paper. The structure and function of system are presented, in which the technologies such as data communication, database, reports print are introduced in detail. The system software, developed by VC++, realizes functions of ratiomonitoring, ratio optimization, data leading-in, data management and help. An application result in Zhongzhou Brach China Aluminium shows the predictive model is effective and that the system implements the computation of blending ratio fast and efficiently, improves the quality of result and stabilizes industrial production.更多还原