量身定制控制阀流量特性的设计
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摘要
控制阀固有流量特性是制造商出厂时所具有的,当安装到现场后,由于阀两端压降与系统压降之比不为1,造成固有流量特性发生畸变,因而控制系统开环增益不能保持恒定,使控制系统稳定性变差。采用被控对象静态特性确定控制阀工作流量特性,然后根据应用条件下的压降比,"量身定制"控制阀固有流量特性,改进后的控制阀应用在实际条件时,其工作流量特性能够精确补偿被控过程的非线性,即使在压降比有改变时,仍可较好地补偿被控对象的非线性,从而可有效改善控制系统的稳定性。
The inherent flow characteristic is its property when control valve leaves manufacture plant.After installation at site,the inherent flow characteristic will be distorted because ratio of pressure drop from both side of valve and system pressure drop is not equal to 1.As a result,control valve open-loop gain can't keep stable,and makes stability of control system poor.The static characteristic of controlled object is adopted to determine control valve work flow characteristic,inherent flow characteristic of control valve is tailor-made based on pressure drop ratio under actual application condition.The work flow characteristic of improved control valve can compensate non-linear of control process under actual condition.It can still compensate non-linear property of controlled object preferably even if pressure drop ratio is changed.Control system stability can be effectively improved.
The inherent flow characteristic is its property when control valve leaves manufacture plant.After installation at site,the inherent flow characteristic will be distorted because ratio of pressure drop from both side of valve and system pressure drop is not equal to 1.As a result,control valve open-loop gain can't keep stable,and makes stability of control system poor.The static characteristic of controlled object is adopted to determine control valve work flow characteristic,inherent flow characteristic of control valve is tailor-made based on pressure drop ratio under actual application condition.The work flow characteristic of improved control valve can compensate non-linear of control process under actual condition.It can still compensate non-linear property of controlled object preferably even if pressure drop ratio is changed.Control system stability can be effectively improved.
引文
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[2]何衍庆,黎冰,黄海燕.工业生产过程控制[M].2版.北京:化学工业出版社,2009.
[3]中国石化集团上海工程有限公司.化工工艺设计手册(上)[M].4版.北京:化学工业出版社,2009.
[4]邱宣振.工程自动化设计应用手册[M].北京:国际科教文出版社,2004.
[5]吴国熙.调节阀使用与维修[M].北京:化学工业出版社,1999.
[6]陆培文.调节阀实用技术[M].北京:机械工业出版社,2006.
[7]陆培文,高凤琴.阀门设计计算手册[M].2版.北京:中国标准出版社,2009.
[8]陈兵.等百分比流量特性调节阀阀瓣型线的研究[D].兰州:甘肃工业大学硕士学位论文,1999.
[9]张玉润,祝和云,金建祥.低压降比调节阀与节能[M].北京:化学工业出版社,1994.
[10]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.GB/T 17213-2—2005工业过程控制阀第2-1部分:流通能力安装条件下流体流量的计算公式[S].北京:化学工业出版社,2005.
[11]NESBITT B.阀门和驱动装置技术手册[M].张清双,尹玉杰,李树勋,译.北京:化学工业出版社,2010.