为优化纸机干燥部气罩气流参数和零位控制系统，在对密闭气罩内外空气条件测量的基础上，分析了机械通风情况下气罩内外压差变化曲线，量化分析了气罩内空气温度和进排风量差变化对零位高度的影响，建立了零位控制量化模型。结果表明：上层气罩内空气温度变化幅度约为进风温度变化幅度的55 %，罩内温度与零位高度成反比关系；进风湿度变化引起进排风量差的变化值约为12.5 %，进排风量差与零位高度成正比关系；零位高度的偏离可通过设置前馈控制系统、调节进排风量差来进行补偿和调整。
Abstract
In order to optimize airflow parameters and zeroposition control system of the closed steam hood in paper machine’s dryer section, the air condition both inside and outside of the hood was firstly analyzed. The pressuredifference changing curve between inside and outside of the hood was established under mechanical ventilation. On the other hand, the influence of air temperature or volumedifference between supplied and drawn air on zeroposition was also quantitatively analyzed. Finally, the quantificational zeroposition control model was established. The results indicated that the air temperature inside upper hood, the variation of which is about 55 % of the variation of supplied air temperature, is directly propotional to the level of zeroposition. The variation of supplied air moisture can cause the volumedifference between supplied and drawn air changing by about 12.5 % which has an inverse propotion to the level of zeroposition. According to the principle of adjusting the volumedifference between supplied and drawn air, the deviation of zeroposition can be quickly regulated by setting feedforward control system.
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参考文献
[1]黄海平,李西华,赵德华,等. SymRun干燥部空气系统设计及运行[J]. 中华纸业,2002,23(12):20-22.
[2]杨博,王孟效,汤唯,等. 专家控制在纸机干燥部通风系统控制中的应用[J]. 制造业自动化,2008,30(7):61-64.
[3]周乐才. 纸机封闭式气罩及其设计要点[J]. 中华纸业,2006,27(10):54-57.
[4]Klepaczka Aleksander. Highintensity convective air hoods in a conventional multicylinder drying section of a papermaking machine[J]. Przeglad Papierniczy, 2004, 60(6): 299-303.
[5]Martz Wesley, Maltais Daniel. Dryer section expert system for dynamic optimization of the paper machine[C]//TAPPI: Proceedings of the TAPPI International Engineering Conference, 1998.
[6]Onel Selis, Gürüz Güniz. Energy optimization of the YankeeHood dryer[J]. Strojniski Vestnik/Journal of Mechanical Engineering, 2001, 47( 8): 512-518.
[7]Ghosh Ajit K, Oxley Frank. Pocket ventilation—an often forgotten area of paper drying[J]. Appita Journal, 2007, 60(4): 301-308.
[8]Bock Thomas. How can the efficiency of the dryer section be increased[J]. International Paperworld, 2006, 6: 62-67.
[9]Mainardi Davide, Gianlorenzi Giancarlo. Energy consumption reduction in tissue drying methodology[J]. Appita Journal, 2008, 61(6): 432-438.
[10]赵书海. 对干湿空气密度计算方法的认识[J]. 河北煤炭,1999(3):57-58.
[11]姚玉英. 化工原理[M]. 天津:天津大学出版社,1999.
[12]王汉青. 通风工程[M]. 北京:机械工业出版社,2005.
[13]Yuan Xiaoxiong, Glickman L R. A critical review of displacement ventilation[J]. ASHRAE Trans, 1998, 104(1A): 78-90.
[14]Nilsson L. Heat and mass transfer in multicylinder drying[J]. Chemical Engineering and Processing, 2004, 43: 1555-1560.
[15]董海荣. 室内空气品质与置换通风[J]. 河北建筑工程学院学报,2003,21(4):61-63.
[16]官振祥,刘振义,李生谦,等. 纸机干燥部热平衡及其计算机辅助计算[J]. 中国造纸,1993(3):31-35.
[17]厉玉鸣. 化工仪表及自动化[M]. 3版. 北京:化学工业出版社,1999.
基金
收稿日期：2009-04-10修回日期：2009-11-16基金项目：南京林业大学江苏省制浆造纸科学与技术重点实验室开放基金项目(200812)作者简介：姚新跃(1985—)，硕士生。*张辉(通信作者)，教授。Email: hgzh@njfu.edu.cn。引文格式：姚新跃,张辉. 纸机密闭气罩内外压差的量化模型[J]. 南京林业大学学报:自然科学版,2010,34(2):95-100.
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