水泥联合粉磨生产过程控制系统研发

发布时间：2018-12-10 14:58

【摘要】：水泥联合粉磨是新型干法水泥生产的关键环节,不但关系到水泥生产的电耗,而且决定了水泥成品质量;联合粉磨系统具有强耦合、大时滞、时变等特性,使其生产控制具有一定难度;单纯依靠相关工艺参数及比表面积化验结果进行生产过程控制,难以保证水泥成品产量与质量。本文借助Malvern粒度分析仪,以粒度分布与磨机负荷为出发点,研发了水泥联合粉磨生产过程控制系统。在智能化工厂关键技术研究与应用示范项目(山东省科技重大专项:2015ZDXX0101F01)资助下,本文开展工作如下:(1)为建立合理的控制方案,在深入分析联合粉磨工艺的基础上,确定了磨机负荷、水泥粒度分布两个控制要点;确定了影响磨机负荷、粒度分布的关键工艺参数,提出了相应的控制思路及策略;(2)为克服粉磨系统时变、耦合、时滞等特点,针对磨机负荷的不同工况,采用Bang-Bang控制对冷风阀开度进行调节;针对粒度分布的不同工况,采用Bang-Bang和动态矩阵控制相结合的控制方法对选粉机等设备进行调节;将现场数据滤波后,利用最小二乘法建立了小于3μm粒度含量、3~32μm粒度含量两个模型;在此基础上设计了水泥联合粉磨系统粒度控制器,经过预测模型、滚动优化、反馈校正,确定了控制器参数,进行了仿真验证,并将其封装成动态链接库文件以进行混合编程;(3)为实现水泥联合粉磨生产的过程控制,配置了生产线DCS和水泥粒度分析仪的OPC Server,并开发了基于C#的OPC客户端,实现了不同平台的数据交互;在(1)和(2)的基础上,研发了水泥联合粉磨生产过程控制系统;结合工程应用效果,从磨机负荷、粒度分布和28天抗压强度三个角度分析了该水泥联合粉磨生产过程控制系统的有效性。
[Abstract]:Cement grinding is a key link in the production of new dry cement, which not only relates to the power consumption of cement production, but also determines the quality of cement finished products. The combined grinding system has the characteristics of strong coupling, large time-delay and time-varying, which makes it difficult to control the production process, and it is difficult to guarantee the output and quality of cement products by relying solely on the related process parameters and the test results of specific surface area. With the aid of Malvern particle size analyzer, a cement combined grinding process control system is developed based on particle size distribution and mill load. Supported by the key technology research and application demonstration project of intelligent factory (2015ZDXX0101F01), the work of this paper is as follows: (1) in order to establish a reasonable control scheme, on the basis of in-depth analysis of the combined grinding process, The control points of mill load and cement particle size distribution are determined. The key technological parameters affecting the load and particle size distribution of the mill are determined, and the corresponding control ideas and strategies are put forward. (2) in order to overcome the characteristics of time-varying, coupling and time-delay of grinding system, Bang-Bang control is used to adjust the opening of cold air valve according to different working conditions of mill load; According to the different working conditions of particle size distribution, the control method of combining Bang-Bang and dynamic matrix control is used to adjust the separator and other equipment. After filtering the field data, two models of particle size content less than 3 渭 m and 32 渭 m grain size content were established by least square method. On this basis, the particle size controller of cement combined grinding system is designed. After prediction model, rolling optimization, feedback correction, the controller parameters are determined and verified by simulation. The controller is encapsulated into a dynamic link library file for mixed programming. (3) in order to realize the process control of cement combined grinding production, the production line DCS and the OPC Server, of cement granularity analyzer are configured, and the OPC client based on C # is developed, which realizes the data exchange between different platforms. On the basis of (1) and (2), the production process control system of cement combined grinding is developed. The effectiveness of the control system for cement combined grinding process was analyzed from three aspects of mill load, particle size distribution and 28 days compressive strength combined with engineering application.
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ172.632;TP273

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