基于变频调速技术的纸浆模塑烘干线的设计-广东工业大学程良伦教授.doc

基于PID变频调速技术的纸浆模塑烘干线系统设计 伦永亮 程良伦 （广东工业大学，广东 广州 510090） 摘要： 针对传统的纸浆模塑烘干线自动化程度低，产品合格率低，能源耗费大等缺点,本文 分析了纸浆模塑制品各干燥过程的不同干燥特性，并设计了一套基于PID变频调速 技术的纸浆模塑烘干线自动控制系统，该系统采用了PID控制的交流变频调速技术 及Modbus现场总线通讯协议，根据现场采集的温度，湿度信号，对循环风机，风门 电机，抽湿风机，输送链传动电机实现变频无级调速控制，合理地调整烘道内输送 带的运行速度、各分段干燥器中的工作温度、热风风量及水蒸气的排放等，形成合 理的干燥曲线，进一步提高了产品的合格率，并减少了电能损耗。从而提高了纸浆 模塑制品的市场竞争能力，有力推进环保事业在包装行业的发展。 关键词：纸浆模塑烘干线；PID；变频调速；MODBUS The system of pulp molding dryer based on the PID frequency conversion speed adjustment YONGLIANG LUN LIANGLUN CHENG (Guang dong university of technology,Guangdong Guangzhou 510090) Abstract: This paper aimed at the problem in old pulp molding dryer,which are non-automatic,low production percent of pass,big energy expending etc.The different character of the pulp molding product in all state of the drying process is analyzed.The automatic control system of pulp molding dryer which is based on the technology of PID frequency conversion speeding adjustment is built..The blowers, air valve motors,dehumidifiers and conveyer motor will be worked in different frequency by the testing temperature and humidity under the system which is based on the technology of PID frequency conversion speeding adjustment and MODBUS procotol.Therefore,the speed of the conveyer and the temperature and humidity in the dryer are adjusted.And the adaptive curve of the drying is formed.The new system will rasie the rate of the pass product,and reduce the energy consumption in the dryer and it can increase the competive of the pulp molding product and promote the environmental development in packing business. Key words: pulp molding dryer;PID;frequency conversion speed adjustment;MODBUS 前言 纸浆模塑制品被喻为“21世纪的绿色包装产品”，它在成型后含有70%-80%的水分，需要通过干燥工序除去。热风对流是国内外普遍采用的纸浆模塑制品的干燥方式。据统计，纸浆模塑制品的烘干成本约占其生产成本的1/3[1]，而用电成本为烘干成本的40%左右。但目前纸浆模塑烘干线的自动化程度低，基本为全人工操作，它不能根据系统参数（分段温度，湿度）实时变化作出及时响应，并造成电能浪费大，产品及格率低等制约因素。因此，本文将分析纸浆模塑制品的干燥机理，并根据其各阶段的干燥特性对传统纸浆模塑烘干线进行基于PID控制的变频调速技术，现代检测技术及MODBUS现场总