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纸机干燥部纸幅水分控制系统优化方案的分析(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2010年04期
Page:
52-56
Column:
研究论文
publishdate:
2010-08-06

Article Info:/Info

Title:
Optimal program of sheet moisture control system for paper machine dryer section
Author(s):
YAO Xinyue1 ZHANG Hui1* HU Muyi2
1.Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China; 2.Key and Open Lab.on Forest Chemical Process, SFA, Nanjing Forestry University, Nanjing 210037, China
Keywords:
paper machine dryer section sheet moisture dry air valve position control feedforward control
Classification number :
TS734+.4;TS736+.3
DOI:
10.3969/j.jssn.1000-2006.2010.04.012
Document Code:
A
Abstract:
In order to overcome the large inertia of moisture control and stabilize the drying curve in paper machine dryer section, valve position control system was studied with dry air intake control as the mainloop, dryer vapor pressure control as the sub loop together with feedforward control. And further, a new control strategy was established in which hood supply air moisture and zerolevel were respectively controlled by circulating load of exhaust air and exhaust rate of fan and dew point was controlled under the upper constraint. The results show that in comparation of conventional sheet moisture control system using the cylinder vapor pressure, the valve position control system with feedforward control can stable sheet moisture fast. The influence of disturbance to exhaust air dew point is so low that its optimal value can be used for system design. The rapidity of dry air intake control and timeliness of feedforward control make moisture fluctuation in sheet so small that the amount of steam and water resources can be effectively saved by optimizing the dryness setting in the quality control system of paper machine.

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Last Update: 2010-08-06