110T铜转炉生产过程余热锅炉水位控制系统

【作者】 陈琳；

【导师】 凌玉华； 廖力清；

【作者基本信息】 中南大学 ， 控制理论与控制工程， 2004， 硕士

【摘要】 余热锅炉是一个多输入、多输出且相互关联的复杂控制对象，汽包水位是锅炉运行的主要指标。由于普遍存在容量较小，热源不稳定的情况，导致锅筒水位波动剧烈，传统三冲量控制规律的控制效果不好。本论文通过对某110T转炉余热锅炉的工艺过程和动态特性进行分析，提出了小型余热锅炉的改进三冲量控制方案，并进行硬件结构设计，组成控制系统对改进三冲量控制规律予以实施。运行结果表明本系统能够基本消除热源波动对水位的影响，同时提高了蒸汽产量和质量，改变了余热锅炉手动运行的现状，对降低人员劳动强度、节约生产成本、提高经济效益都具有重要意义。 在系统设计时，利用PLC功能较强、运行稳定的特点，构成由上位工控机和下位PLC组成的控制系统，通过以太网交换过程变量和控制参数的硬件结构。下位机选用美国通用电气公司的GE Fanuc90—30系列PLC上位机应用程序采用CETECT 5.4组态软件设计。论文概述了转炉生产的工艺过程，分析了锅筒水位的动态特性；着重论述了改进三冲量控制规律的推导及应用过程中的性能分析；设计了适合余热锅炉的并联FUZZY／模糊自适应PID控制算法；编制了控制策略的相应软件。应用结果表明，本论文提出的设计方法能有效地对余热锅炉水位及其他过程参数进行控制，具有广泛的应用前景。更多还原

【Abstract】 Waste heat boiler is a multi-input and output system. The drum water level is the most important target in boiler’s running. Because of the vary of heat resource, the water level in drum could not be controlled hrough the traditional three variable controlled way. In this thesis, dynamic characteristic of drum water level in the copper converter smelting process of 110 ton was discussed. Relationship between different disturbances was studied also. After the shortage analysis of traditional control scheme, a improved three variables control scheme had been presented. Additional, in this thesis had designed the firmware system to apply the control scheme, the running has showed that the control system could decrease the water level’ flow, the steam’ quality and quantity has increased at the same time. The application of this system had changed the waste heat boiler’ running way, and increased the running efficient.The control system’ firmware is designed by using PLC and computer communicate through Ethernet to apply the improved three variables control. GE, FANUC 90-30 series programmer logic controller was chosen to realize control request, and CITECT software is used to supervise the procedure. To increase the robust ability, a Fuzzy/Self Adaptive Fuzzy PID controller is used. The running result proves that, the control system’ design in this thesis is efficient in the waste heat boiler’ control, and has a more optimistic foreground to use it extend.更多还原