节段式多级离心泵高压变频节能改造方法
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摘要
为了解决节段式多级离心泵平衡盘特性及临界转速点导致的高压变频节能改造难度大的问题,采用启动过程转速快速增大,迫使轴推向力迅速大于平衡力,平衡盘迅速完成平衡脱离,进入平稳运行阶段的方法,克服平衡盘特性;同时对启动过程进行分段速度定义,遵循短时加速启动、长时平稳运行的原则解决临界转速点问题,使节段式多级离心泵高压变频节能改造技术更加完善,改造后系统更为稳定。
In order to solve the revamping problem of high-voltage frequency conversion energy-saving transformation caused by the characteristics of balancing disc and critical speed point of multi-stage centrifugal pump,a method of overcoming the balancing disc is adopted,in which the speed increases rapidly during start-up,forcing the thrust force of the shaft to exceed the balancing force with a short time. The balancing disc will complete the balancing disengagement quickly and enter the stage of stable operation. At the same time,by defining the starting process by stages and following the principle of short-term accelerated start-up and long-term stable operation,the critical speed point problem is solved,which makes the high-voltage frequency conversion energy-saving transformation technology of segmental multi-stage centrifugal pump more perfect and the system more stable after transformation.
In order to solve the revamping problem of high-voltage frequency conversion energy-saving transformation caused by the characteristics of balancing disc and critical speed point of multi-stage centrifugal pump,a method of overcoming the balancing disc is adopted,in which the speed increases rapidly during start-up,forcing the thrust force of the shaft to exceed the balancing force with a short time. The balancing disc will complete the balancing disengagement quickly and enter the stage of stable operation. At the same time,by defining the starting process by stages and following the principle of short-term accelerated start-up and long-term stable operation,the critical speed point problem is solved,which makes the high-voltage frequency conversion energy-saving transformation technology of segmental multi-stage centrifugal pump more perfect and the system more stable after transformation.
引文
[1]王光明.多级离心泵改造方案分析及其在工程中的应用[J].化工设计通讯,2017,43(11):268.
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[2]赵永德,暴剑.分段式多级水泵平衡盘轴向最佳间隙的分析[J].通用机械,2003(2):44.
[3]姚家玲.高压变频器在循环流化床锅炉上的节能与应用[J].区域供热,2015(1):46.
[4]郑龙席,李晓丰,秦卫阳.计算转子临界转速的两种方法及对比分析[J].风机技术,2009(6):35.
[5]孙兴华,王跃方,郭婷.离心泵转子的湿态临界转速计算及边界环境对其动力特性的影响[J].水泵技术,2011(2):26.
[6]王晓夫.机械系统运行发现谐振时由用户对变频器设置可选的跳频点和跳频宽度参数[J].电气应用,2010(20):18.
[7]方华,刘文烽.一种新型锅炉供水自动控制系统的设计及应用[J].自动化与仪表,2001,16(1):42.
[8]周金伟.机泵工作点在高效工作区内运转的判定[J].设备管理与维修,2018(1):51.
[9]孙红岩,张小龙.基于ANSYS软件的转子系统临界转速及模态分析[J].机械制造与自动化,2008,37(4):53.
[10]杜美明. PLC控制系统中急停的应用[J].冶金自动化,2006,30(增刊1):835.