回转窑过程控制和监测系统的设计与实现

针对回转窑—链篦机生产永磁铁氧体预烧料的工艺过程 ,设计了重油温度控制系统、窑温度控制系统和智能仪表监测系统 ,以保证工艺参数和产品质量的稳定。根据重油的品质变化 ,重油温度控制系统选用数字控制器使控制精度达到± 1℃。由于回转窑系统的容量大、滞后长及物料滑动的固有特性 ,采用红外炉窑温度—重油压力串级双回路控制系统 ,提高了系统的可靠性和稳定性 ,使炉窑温度的精度控制在± 10℃之内。选用智能仪表实现控制过程的实时监测、数据存贮和统计分析 ,提高了系统性能 ,并实现从产品质量对工艺参数的追溯 ,有利于提高产品质量 ,优化工艺过程。

DESIGN AND EXECUTION OF PROCESS CONTROL AND MONITORING SYSTEM FOR ROTARY KILN

In the light of the special technological process for preparing magnetic materials in a kiln, the control system for oil and kiln temperatures and the monitoring system with intellectual meters have been designed for maintaining the stability of process parameters and product quality. A digital controller with an accuracy of ±1℃ has been used in oil-temperature control system to compensate the change of oil quality. Because of some inherent features of the kiln such as high capacity, long response time and rolling materials in the kiln, a serial double-loop control system, which includes the infrared temperature control and oil pressure control, has been used to improve the stability and robustness of the system. The control accuracy for the kiln temperature is within ±10℃. Use of intellectual meters for the real-time monitoring, data memory and statistical analysis to control process have improved the system performance and made the look-back from product quality to technique parameters executed, thus being favorable to improvement of product quality and optimization of the technological process.