硅酸钠窑炉温度控制系统的设计

发布时间：2019-04-15 19:58

【摘要】：传统的硅酸钠窑炉的温度控制,大多采用的是手动控制,窑炉温度波动较大,控制效果不佳,严重影响了硅酸钠产品的质量。本文结合某企业的硅酸钠生产线的实际项目,从目前国内外对窑炉温度控制的研究现状出发,设计了一套可行的硅酸钠窑炉温度计算机控制系统,该系统以WinCC组态软件为上位机,以S7-200 PLC为下位机,实现了对硅酸钠窑炉温度的智能优化控制,旨在提高生产效率、控制精度和稳定性,实现生产的智能化以及节能环保。硅酸钠窑炉温度的测量方式,一般采用的都是利用辐射感温计,测量溶化室火焰的温度,存在着灵敏度不高,测量不够准确的缺陷。针对这一现象,本文提出了一种基于红外辐射的测温方式,用红外辐射高温计代替传统的辐射感温计,提高了测量的精度和灵敏度,从而,提高了产品的质量。硅酸钠窑炉温度控制系统一个大滞后,扰动因素多且强的复杂系统。常规的PID控制已经很难满足控制要求。本文深入地研究了预测控制算法,提出了DMC-PID串级调节控制方法,减小了扰动,提高了控制系统的跟踪性、鲁棒性和稳定性。并增加了含氧量控制系统,不仅实现了窑炉温度的智能调节,而且提高了煤气的利用率,达到了节能减排的目的。最后,完成现场安装调试并按期投入生产,在投产过程中,整个窑炉温度控制系统稳定高效、安全正常地运行,提高了生产率和产品质量,促进了企业的发展。
[Abstract]:The traditional temperature control of sodium silicate kiln mostly adopts manual control. The furnace temperature fluctuates greatly and the control effect is not good, which seriously affects the quality of sodium silicate products. Combined with the actual project of sodium silicate production line in a certain enterprise, this paper designs a feasible computer control system of sodium silicate furnace temperature from the present research situation of furnace temperature control both at home and abroad. The system uses WinCC configuration software as upper computer and S7 / 200 PLC as lower computer to realize intelligent optimization control of sodium silicate furnace temperature. The aim is to improve production efficiency, control precision and stability, realize intelligent production and energy saving and environmental protection. The method of measuring the temperature of sodium silicate kiln is usually using radiation thermoscope to measure the temperature of flame in dissolving chamber, which has some defects such as low sensitivity and inaccuracy. In view of this phenomenon, this paper presents a temperature measurement method based on infrared radiation. Using infrared radiation pyrometer instead of traditional radiation thermoscope improves the precision and sensitivity of the measurement, and thus improves the quality of the product. The temperature control system of sodium silicate kiln is a complex system with large lag and many disturbance factors. Conventional PID control has been difficult to meet the control requirements. In this paper, the predictive control algorithm is studied deeply, and the DMC-PID cascade control method is proposed, which reduces the disturbance and improves the tracking, robustness and stability of the control system. The oxygen content control system is added, which not only realizes the intelligent adjustment of kiln temperature, but also improves the utilization rate of gas, and achieves the purpose of saving energy and reducing emissions. Finally, the site installation and commissioning are completed and put into production according to schedule. In the process of commissioning, the whole furnace temperature control system runs stably, efficiently, safely and normally, which improves the productivity and product quality, and promotes the development of the enterprise.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ177.4;TP273

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