空气压缩机新型防喘振控制系统原理及应用

详细介绍防喘振控制系统的组成及防喘振控制算法,并以该控制算法精确建立了压缩机通用防喘振性能图.防喘振控制器根据压缩机通用防喘振性能图上喘振控制线进行PI控制,并通过快开控制线阶跃输出,安全状态控制加以配合,共同完成压缩机的防喘振控制.     

防喘振功能在透平式压缩机控制中的应用

介绍透平式压缩机发生喘振的原因、防喘振的基本方法和防喘振控制的原理,并对该防喘振功能的实现进行了具体说明。     

一种离心压缩机防喘振控制策略及其应用

在详细分析喘振的危害、喘振发生机理和影响因素的基础上,介绍了目前工程上常用的两种离心压缩机防喘振控制方法。为最大程度地扩展机组的运行工况范围和提高性能,采用可变极限流量法发展了一种离心压缩机防喘振控制策略。该策略包括防喘振数学模型的建立和防喘振控制系统的设计,并成功地应用于某离心压缩机组的防喘振控制系统。     

TRICON防喘振控制系统在催化主风机中的应用

文章主要讲述利用TRICON防喘振扩展函数功能模块来完成催化主风机组的防喘振控制.该模块通过设置喘振线、喘振控制线,根据主风机喉部差压、入口压力、出口压力及相应的温度计算工作点和安全裕度,利用TRICONEX独特的防喘振算法来判断是否发生喘振并根据工作点和安全裕度快速地进行防喘振控制。     

离心式压缩机防喘振流量确定及防喘振阀选择原则

介绍了如何确定离心式压缩机防喘振流量和ITCC控制厂家关于防喘振阀的选择和计算原则,并以某新建百万吨级乙烯装置的裂解气压缩机为例,就如何确定该压缩机的防喘振流量和选择防喘振阀以及计算防喘振阀门系数做了说明,并指出工艺设计中的注意事项。     

主风机三参数防喘振算法在TS3000中的实现

中石化洛阳分公司一催化主风机的防喘振控制中,有静叶转角、出入口差压、入口流量三个参数参与了防喘振运算,而TS3000系统的防喘振功能块只有两个输入参数,在控制系统改造时由于算法选用不当,导致机组操作区间变小.通过对三参数喘振控制算法与TS3000防喘振控制功能进行分析对比,采用了合理的组态方案对喘振线进行了修正,实现了三参数防喘振控制算法,达到了良好效果.     

V－1801空气压缩机防喘振管线振裂原因及改进措施

Ｖ┐１８０１空气压缩机防喘振管线振裂原因及改进措施高兴产（山西化肥厂，潞城，０４７５０７）山西化肥厂合成氨装置空气压缩机机组试车时，压缩机防喘振管线振动异常严重，最后导致防喘振管线振裂，压缩机被迫紧急停车。１防喘振管线振动原因压缩机防喘振管线见图１。...     

ITCC在压缩机防喘振上的应用

本文介绍TRICON控制系统在合成氨装置压缩机控制中的应用,论述了压缩机的防喘振控制理论,详细介绍了防喘振控制器的功能及防喘振控制程序以及在线维护喘振仪表的注意事项。     

Woodward防喘振系统在三菱CO2压缩机中的应用

介绍了首台三菱CO2压缩机防喘振系统在尿素生产装置中的应用情况。着重阐述整体防喘振与分缸防喘振的工艺区别,并对W oodward防喘振控制系统的详细应用作出介绍。     

连续催化重整循环氢压缩机喘振分析及防喘振控制

分析了连续重整装置离心式循环氢压缩机发生喘振的原因和喘振机理,阐述了压缩机喘振的危害,探讨了防喘振系统预防喘振的原理和措施。介绍了洛阳石化连续催化重整装置循环氢压缩机K201新增的防喘振控制系统,分析了防喘振系统运行过程中出现的问题,预测了运行隐患。事实证明,新增的防喘振系统有效地提高了离心式压缩机运行的可靠性和平稳性,装置没有再发生喘振现象。     

Model predictive control of a fixed-bed reactor with nonlinear quality inference

A generic model predictive control framework has been proposed for a fixed-bed reactor with exothermic reaction. The proposed framework can conduct nonlinear inferential control of a product concentration together with linear multivariable control of bed temperatures. In addition, the framework can accommodate the multi-rate sampling and analysis delay caused by the product measurement. Performance of the proposed technique has been demonstrated with a non-adiabatic fixed bed reactor model producing maleic anhydride under various operating scenarios.     

PLC在塑料挤出机温度控制系统中的应用

介绍了SIMATIC S7－300可编程控制器在塑料挤出机温度控制系统中的应用，控制回路采用PID参数自整定和脉宽调功法，控制系统把传统的PID控制和PLC的逻辑判断指令结合起来，使PID控制更为灵活，能满足生产过程的要求。详细描述了系统的工作原理和PLC的硬件组成、软件编制，简单介绍了上位机的组态软件WinCC。     

改进型Fuzzy—Smith控制在再热器中的应用

针对再热器温度控制系统具有不确定性,大迟延和大惯性等特点,基于Smith预估器结构,提出一种改进方案。在Smith预测控制的基础上引入了模糊自整定方案,仿真和试验结果表明,新的控制方案不仅具有满意的控制性能,而且具有较强鲁棒性和抗干扰性能,对时变大滞后对象具有良好的控制效果。     

An indirect feedforward composition controller for distillation columns

This paper addresses the problem of designing an indirect feedforward controller, also called cascade control, to regulate the product composition of distillation columns to overcome load disturbances. The overall controller is composed of two cascaded controllers. The primary controller is basically a low-gain controller, which uses slow (delayed) composition measurements to provide servo responses (composition control). The secondary controller has the structure of a high-gain proportional-integral (PI) controller with an antireset windup scheme, which uses fast temperature measurements at a given distillation tray to track the output of the primary controller. In this way, the secondary controller also provides protection against load disturbances. A simulated example is used to illustrate the functioning of the proposed controller.     

AN INDIRECT FEEDFORWARD COMPOSITION CONTROLLER FOR DISTILLATION COLUMNS

This paper addresses the problem of designing an indirect feedforward controller, also called cascade control, to regulate the product composition of distillation columns to overcome load disturbances. The overall controller is composed of two cascaded controllers. The primary controller is basically a low-gain controller, which uses slow (delayed) composition measurements to provide servo responses (composition control). The secondary controller has the structure of a high-gain proportional-integral (PI) controller with an antireset windup scheme, which uses fast temperature measurements at a given distillation tray to track the output of the primary controller. In this way, the secondary controller also provides protection against load disturbances. A simulated example is used to illustrate the functioning of the proposed controller.     

Controlled output variance based diagnosis tree for feedforward/cascade control systems

This paper aims at providing a framework for detection and diagnosis of the performance of a combinational feedforward (FF) and cascade (CC) control system. It is the extension of our previous work [1,2]. The main idea is to extract the only CC effect and the combination of FF with CC effects, respectively. In the only CC effect, the output variances of the primary and the secondary loops can be turned into the cascade-invariant and cascade-dependent terms, respectively. The combination of FF with CC effect can also be decomposed into the cascade/feedforward invariant term, the cascade-invariant/feedforward-dependent term and the cascade/feedforward dependent term. The diagnosis tree based on these decomposition terms is proposed to assess the performance of the FF/CC control system. The sequence of the statistical inference system is developed to diagnose fault causes. The capability of the proposed method is demonstrated via a cascade control system with the feedforward loops and multiple faults.     

优化控制与仿真

对催化剂隔离系统差压控制系统进行了分析,利用仿真模拟系统,优化了待生、再生催化剂隔离阀组控制方案。通过提供近似于真实的操作环境和操作工况,模拟实际装置生产过程,为新装置开车方案、事故分析、生产优化、控制方案研究等提供了平台,达到了预期的效果。     

改进型Fuzzy—Smith控制在再热器中的应用

针对再热器温度控制系统具有不确定性,大迟延和大惯性等特点,基于Smith预估器结构,提出一种改进方案。在Smith预测控制的基础上引入了模糊自整定方案,仿真和试验结果表明,新的控制方案不仅具有满意的控制性能,而且具有较强鲁棒性和抗干扰性能,对时变大滞后对象具有良好的控制效果。     

控制回路中气动调节阀的选用

介绍了气动调节阀选择的几个因素。根据化工生产的工艺条件,选择合适的调节阀结构和类型;根据工艺对象,选择合适的流量特性;根据工艺参数,计算流量系数,选择阀的口径;根据工艺要求,选择材料和辅助装置。     

现场总线控制在过程控制中的应用

现场总线控制系统自问世以来迅速在控制工程领域占有一定的份额,渗透到各行业.本文对过程控制和现场总线控制系统的特点进行了总结,就现场总线控制系统在过程控制中的应用进行了分析,与传统的过程控制系统进行了比较,得出现场总线控制系统能更好地满足过程控制要求.