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鼓风炉熔炼富铅渣预控系统的开发
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摘要
本论文首先对云南冶金集团总公司引进的强化冶炼技术-Ausmelt法处理硫
    化铅精矿,产出粗铅、富铅渣和高浓度SO2进行了分析。用先进的Ausmelt技术对
    传统的烧结-鼓风炉进行改造,提出了用鼓风炉熔炼富铅渣的熔炼工艺。该工艺
    能很好地解决了传统炼铅工艺中低浓度SO2的问题,又结合了容易操作控制的鼓
    风炉熔炼技术,提高了SO2的浓度,避免了传统流程中大量返料周转,提高了资
    源利用率。因此该工艺具有很好的应用前景,但是该工艺的计算机模拟和控制研
    究,特别是针对FeO-CaO-SiO2-PbO-ZnO渣系的粘度、表面张力和作用浓度数学模
    型却很少。
    本论文重点是在大量工业实验数据和资料数据的基础上,运用物料平衡、热
    平衡的原理,建立了热力学参数控制模型;运用多元线性回归分析,建立了炉渣
    粘度和表面张力预测模型;并把熔渣结构共存理论应用于炉渣作用浓度预测模型
    的建模中,建立了作用浓度预测模型。在此基础上,运用预测控制理论,建立了
    预测控制系统,可以实现对整个熔炼过程的滚动优化和反馈校正。
    控制模型在给定富铅渣成分及相关参数后,可以预测出此条件下的产物物相
    组成和产出量、鼓风量、焦碳耗量,并能够根据输入的数据绘制空气湿度、CaO
    含量等影响因素的趋势图。根据机理模型预测的结果,可以进一步进行炉渣粘度、
    作用浓度和表面张力的预测,实现物相和炉况的双重控制,预测结果与事先输入
    的实际值进行比较,可以实现模拟的在线校正,使系统更趋完善。整个预控系统
    对一线生产过程起离线指导作用,与未使用此系统时相比,它能够直观的给予工
    人操作指导,简化其工作程序并提高工作效率。
Firstly, this paper had analyzed the intensified smelting technical process-Ausmelt's technology recommended by Yunnan metallurgy group that was used to deal with the upgraded vulcanized lead and produce wet lead, rich lead slag and high concentration sulfur dioxide. The traditional sintering - blast furnace was transformed with advanced Ausmelt's technology and put forward smelting technology to smelt the rich lead dregs with the blast furnace. This technology could solve the problem of low consistency SO2 in traditional lead smelting technology, and combined with the easily operating blast furnace smelt the technology, and avoided a large number of materials returning turn over in traditional flow, and raised the resources utilization ratio. Therefore this technology possesses have good application foreground. However the computer simulation and control of this technology was studied seldom, especially mathematics model of the viscosity of FeO-CaO-SiO2-PbO-ZnO slag systems, surface tension and the effect c
    onsistency.
    This thesis emphasis was on the foundation of a large number of industry experimental ata and material data, and built thermodynamic parameter control model with the principle "material balanced and thermal equilibrium. And also used multiple linear regression analysis to built slag viscosity and the surface tension forecasting model. Appling the coexisting theory of the melts slag structures in the slag acting consistency forecasting model and built the effect consistency forecasting model. Using the control theory of calculation, the forecasting control system was built on this foundation. This could realize the roll optimization and feedback proofreading with wholly smelting course.
    The controlled model could predict the constituency of the product, output capacity, blast capacity and burnt carbon capacity consuming after the composition of the rich lead slag and related parameter was determined. And the trend pictures of influence factor such as air humidity, and etc can be drawn according to the data of input. Further more, according to the result of mechanism model forecasting, the forecasting of slag viscosity, effect consistency and surface tension could be carried on. So it can realize the double control about the constituent phase and the furnace conditions. To compare the data be in advance imported with the fact data, it could realize the on-line proofreading and correct to make the system more perfect. The predictive controlled system would offer off-line guidance for the workers, and simplify the work
    
    
    procedure and raises work efficiency.
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