滚筒式薄板烘丝机基于排潮风风量的烟丝含水率控制方法

Control of Tobacco Moisture Content in Thin Plate Cylinder Dryer Based on Exhausted Air Volume

为解决滚筒式薄板烘丝机烟丝加工过程中筒内环境温度波动对烟丝香气的影响等问题,通过分析滚筒式薄板烘丝机工作过程中影响烟丝含水率的相关变量,在薄板温度和热风温度均恒定的条件下,提出了一种基于排潮风风量的烟丝含水率控制方法。基于排潮风风量建立了控制模型,研究了入口烟丝含水率和入口烟丝流量对排潮风含水量的影响,以及排潮风门开度与风量的关系。利用排潮风门自适应PID专家控制策略实现了控制过程,通过PID值整定,防止烟丝含水率超调和波动。结果表明:改变排潮风风量可以控制薄板烘丝机的烟丝含水率,排潮风门响应时间比蒸汽加热时间短,调控速度比调节薄板温度或热风温度更快,实现了烟丝含水率的快速可调可控;保证了烟丝干燥时香气的稳定,避免同批次烟丝在同质化加工中产生差异,有效提高了卷烟品质。

To reduce the influences of temperature fluctuation inside cylinder dryer on the aroma of processed cut tobacco, the relative variables influencing moisture content in tobacco during the drying process were analyzed, a control method for moisture content in dried cut tobacco based on exhausted air volume from the cylinder while retaining the thin plates and hot air at constant temperatures was proposed. A control model was developed, the effects of tobacco input rate and its moisture content on the humidity of the exhausted air, and the relationship between the opening of the exhausted valve and exhausted air volume were studied. The self-adapting PID expert control strategy for valve was adopted to implement the control process, and PID value was set to prevent the moisture content in tobacco from over regulation or fluctuation. The results showed that changing exhausted air volume could control the moisture content in dried tobacco, the response time was shorter for valve than that for steam heating＇and regulating valve was faster than regulating the temperature of thin plate or hot air. The moisture content in tobacco was controlled and regulated rapidly, which ensure the consistence of cut tobacco aroma during drying and avoid the discrepancyof tobacco quality in production.