烧结混合料水分自动控制系统的开发及应用

Development and application of automatic moisture control system for sintering mixture

混合料水分在烧结过程中有着制粒和导热的作用,水分的控制一直是烧结生产中关注的重点。为了更好地对混合料水分进行控制,开发了一种以红外水分分析仪、微波水分分析仪及变频水泵等作为硬件基础,以PID控制、前馈控制、反馈控制等来实现水分实时监测和闭环自动调节的水分自动控制系统。主要从硬件组成及工作原理、设计、应用效果等方面对该系统进行了阐述,并对其在柳钢3~#360 m^2烧结机的应用情况进行了介绍。该系统投入使用后,水分目标值稳定率(±0. 2%)由85. 3%提高到95. 7%,烧结矿转鼓指数稳定率(>75%)由95. 6%提高到98. 9%,FeO稳定率(±1.0%)由96.7%提高到了98.8%,利用系数由1.478t/(m^2·h)提高到了1.537t/(m^2·h),有效地减少了混合料水分的波动,改善了烧结矿的产、质量指标。

The moisture of the sintering mixture plays the roles of greinulation and heat conduction during the sintering process,and the control of moisture has always been the focus of sintering production.In order to control the moisture content of mixture better,an automatic water control system based on infrared moisture analyzer,microwave moisture analyzer and frequency conversion pump is developed,which realizes real-time moisture monitoring and closed-loop automatic regulation by means of PID control,feed-forward control and feedback control.In this paper,the system is described from three aspects:hardware composition,working principle,design and application effect of the automatic water control system,and its application in Liugang 3#360 m2 sintering machine is introduced.After the system is put into use,the moisture target value stability rate(±0.2%)is increased fix>m 85.3%to 95.7%,and the sinter tumbler index stability rate(>75%)is increased from 95.6%to 98.9%.The FeO stability rate(±1.0%)is increased from 96.7%to 98.8%,and the utilization factor is increased from 1.478 t/(m^2·h)to 1.537 t/(m^2·h),which effectively reduces the fluctuation of the mixture moisture and improves the output and quality indexes of sinter.