纸板机密闭气罩控制系统的设计

A Control System Design of the Closed Steam Hood for Paper Board Machine

关键词:  密闭气罩  DCS控制系统  高级控制算法  S7-300 PLC  纸板机干燥部

Key Words:closed steam hood  DCS control system  advanced control algorithms  S7-300 PLC  dryer section of paper board machine

摘要:在介绍密闭气罩通风除湿的工艺原理的基础上，分析了密闭气罩的控制要点和难点，并针对能耗较高的带表面施胶的涂布白纸板生产线，设计了一套基于西门子S7-300 PLC的密闭气罩DCS控制系统，详细阐述了密闭气罩的排风温湿度选择控制、气罩零位的前馈反馈控制、气罩热风风温的分程控制、消防智能控制等高级控制算法或控制策略，最后给出了针对纸板机密闭气罩设计方面的建议。本控制系统已经在浙江富阳涂布白纸板基地的近10条纸板机上得到应用，取得了良好的节能控制效果。

Abstract:After introducing the principle of air ventilation and moisture removed of the closed steam hood, the key and difficult points for control were analyzed. Aiming at the coated white paper board machine with surface sizing and high steam consumption, a SIMATIC S7-300 PLC based DCS control system for closed steam hood was designed. The paper illustrated the advanced control algorithms or control strategies such as the selection control of the temperature and humidity of the discharged air, the feedforward and feedback control of the steam hood zero-level pressure, the split range control of the hot feed air, the intelligent control of fire protection, optimization control of energy consuming, etc. Several pieces of advice on paper board machine closed steam hood design were proposed at last. The control system proposed in this paper has been used in nearly 10 paper board plants in the coated white paper board base of Fuyang, Zhejiang province and satisfactory energy-saving performances were reported.