纸张干燥自动控制系统设计与实现

造纸工艺中成纸的水分控制和吨纸能耗是2个重要的质量和成本控制指标。国内造纸厂抄纸车间长网多缸纸机一般多按传统的三段通汽方式进行纸页干燥，在传统工艺和设计中，由于工艺人员无法精确控制纸浆流量和烘缸内压差，往往存在烘缸排水不畅、吨纸汽耗过高等现象，从而导致产品质量和成本无法有效控制，因此在产业升级换代过程中迫切需要进行相应的技术改造。通过开发集散控制系统(DCS)，设计出各类测量传感器和控制方案，实现了对抄纸车间1 760 mm/300 m长网多缸纸机供热系统的精确自动控制，最终达到了质量控制和节能降耗的目的。

Development of autocontrol system of paper making dryness device

The moisture control in paper making process and the energy consumption per ton of paper are two important control indicators for quality and cost control. In domestic paper mill, the way of paper drying mostly adopts traditional steam drying for long multi-cylinder paper machine. Because the technology personnel cannot accurately control the pulp flow and the pressure difference, the steam dryer tends to have poor drainage, higher energy consumption per ton of paper, resulting in difficulties in product quality and cost control. It is urgent to perform technical reform in the process of industrial upgrading. Through the development of Distributed Control System(DCS), various types of measuring sensor and control scheme are designed, implementing precise control on the heating system for 1760 mm/300 m long net multi-cylinder paper machine, which achieves the goal of quality control and energy saving.