基于PLC的制浆造纸质量最优控制方法研究

Research on Optimal Control Method of Pulp and Paper Quality Based on PLC

材料成分以及制造工艺,都会影响制浆造纸质量,因此需要研究能够控制制浆造纸质量最优的方法。传统方法采用的控制技术为单项控制,导致纸张中出现过量杂质、缺损等质量问题,因此研究基于PLC的制浆造纸质量最优控制方法。根据近红外光谱原理,建立制浆造纸质量红外模型,实时监控造纸材料成分;基于PLC技术与设备,重新设置速度链控制策略和负荷分配方式,实现对制浆造纸工艺的双向控制;通过控制打浆过程中的比能量和打浆度,实现制浆造纸质量的最优控制。实验结果:与传统方法相比,所研究控制方法应用下,纸张杂质过量、偏薄、破损以及污损的情况较少,且PLC控制下,制浆造纸设备的运行功率,被控制在标准范围内。可见基于PLC的控制方法性能更佳。

Material composition and manufacturing process will affect the quality of pulp and paper. Therefore, it is necessary to study the optimal method to control the quality of pulp and paper. The traditional control technology is single control, which leads to excessive impurities, defects and other quality problems in paper. Therefore, the optimal control method of pulp and paper quality based on PLC was studied. According to the principle of near-infrared spectroscopy, the infrared model of pulp and paper quality was established to monitor the composition of paper-making materials in real-time. Based on PLC technology and equipment, the speed chain control strategy and load distribution mode were reset to realize the bidirectional control of pulp and paper making process. The optimal control of pulp and paper quality was achieved by controlling the specific energy and beating degree in the beating process. Experimental results showed that compared with the traditional method, the problems of excessive impurities, thinness, damage and defect were less. Moreover, with PLC control, the operation power of pulp and paper equipment was controlled within the standard range. It can be seen that the control method based on PLC has better performance.