空分装置中空压机控制系统的原理与应用

本文详细介绍了空压机的基本控制、不同工况的控制过程、防喘振控制及对电机的控制,进行了控制模式的探讨,分析了空压机运行调试过程中的问题。     

基于模糊自适应PID控制的空压机防喘振控制的研究

本文主要对当前空压机防喘振控制的常用方法进行利弊分析,并将模糊自适应PID控制应用于防喘控制,通过Matlab仿真工具Simulink仿真实验后,证明该方法对压缩机防喘振控制有着重要参考价值.     

空压机防喘振与DCS控制

本文介绍了大型压缩机喘振的原因、危害,并详细的讲述了首钢京唐制氧厂空压机防喘振控制的原理、喘振线的确定和DCS实现的过程,以及自动化仪表故障对喘振控制的影响。     

药业空压机控制系统DCS的应用

通过DCS系统在药业发酵生产中用到的500m3/min及250m3/min的离心空压机装置上的应用,总结出空压机控制所用到的控制方案。根据喘振机理和防喘振控制方法,实现了对空压机、汽机的自动化控制,达到了较高的自动化控制水平。     

离心压缩机防喘振控制方法的研究及应用

本文主要介绍了我们研制的离心压缩机防喘振控制器所采用的防喘振控制方法，离心压缩机防喘振控制器的原理、功能以及在高炉鼓凤机上的应用。     

基于和利时系统的模糊自适应PID防喘振控制

针对固定极限流量防喘振控制能量浪费严重,而可变极限流量控制的比例积分控制器不能很快地响应工作点向控制线的移动,又需安全裕度比较大(>13%)的问题;利用和利时DCS系统模块丰富、组态灵活的特点,设计出自适应模糊PID控制器,根据偏差及偏差的变化,协调好PID参数,实现离心式空压机的防喘振控制;避免了过多回流,同时也保证了机组的安全。     

Atlas风机防喘振辅助设计及应用

本文主要介绍了Atlas风机的控制回路,并对风机喘振原因进行了分析。阐述了Ausmelt吹炼工艺中Atlas风机的防喘振优化设计方案与实施。     

污水处理过程中鼓风机防喘振控制的设计与实现

为确保鼓风机在污水处理过程中稳定可靠地高速运行，需有效地控制喘振现象，同时考虑到小城镇建设的小型污水处理厂的经济承受能力有限，提出采用低成本的Moore353自动过程控制器设计与实现防喘振控制;通过分析污水处理过程中风机防喘振控制的特点，对常规算法进行补充；并且针对防喘振系统正常负荷下控制偏差长期存在，不利于防喘振阀实时准确地动作，提出了解决方案；实践证明，控制效果良好，成本明显降低。     

Atlas风机防喘振辅助设计及应用

本文主要介绍了Atlas风机的控制回路,并对该风机喘振的原因进行了分析。阐述了Ausmelt吹炼工艺中Atlas风机的防喘振优化设计方案与实施。     

醇酮装置中压缩机防喘振控制的研究

在简要介绍醇酮装置工艺流程及防喘振控制原理的基础上,阐述了压缩机防喘振控制系统的设计思想与方案.实际运行表明,采用这种防喘振控制系统的压缩机运行平稳.     

循环氢压缩机防喘振控制设计分析

详细介绍了BCL450循环氢压缩机防喘振控制设计，及其在炼油厂柴油加氢装置的应用。     

Co-surge in bi-turbo engines: Measurements,analysis and control

In parallel turbocharged V-engines, with two separate air paths connected before the throttle, an oscillation in the flow can occur. If the compressor operates close to the surge line, typically during low speed and high load, and a disturbance alters the mass flow balance, the compressors can begin to alternately go into surge. This phenomenon is called co-surge and is unwanted due to high noise and risk of turbocharger destruction. Co-surge is measured on a test vehicle in a chassis dynamometer and the system analyzed and modeled using a mean value engine model. The investigation shows that alternating compressor speeds have an important role in the prolonged oscillation. A reconstruction of the negative flow from measurements is made and compared to simulation results, showing similar amplitudes, and supports the model validation. A new co-surge detection algorithm is presented, suitable for a pair of sensors measuring either mass flow, boost pressure or turbo speed in the two air paths. Furthermore, a new controller is proposed that uses a model based feedforward for the throttle, together with wastegate actuation to force the compressor speeds together and improve balance at the recovery point. This has been shown to be sufficient for moderate to high pressure ratios over the throttle, and only for zero or very low pressure drop the use of bypass valves is necessary. The advantage of not opening the bypass valves is a smaller drop in boost pressure which also reduces the torque disturbance. The performance of the controller is evaluated both in simulation and in the test vehicle.     

Adaptive control of compressor surge instability

In this paper we propose a simple high-gain type adaptive control scheme for surge stabilization in a compression system. We consider a typical configuration in which the plenum throttle position is the control input, while the measured output is given by the total pressure at the compressor inlet. We prove convergence of the control scheme using a simplified, but widely accepted, second-order model. The system does not satisfy strict minimum-phase assumptions, usually introduced in the high-gain type adaptive control context, and therefore the proof has been tailored to the specific problem. We finally validate the proposed controller, by means of both numerical simulation and experiments on a real plant.     

关于富气压缩机的随动反喘振控制在PROVOX工程集散控制系统上的应用

广州石油化工总厂催化裂化装置于1978年建成投产,是采用美国FISHER控制设备公司的PROVOX工程集散控制系统.今年经改造年处理能力由原来的120万吨提高到150万吨.自控方面改造的重点是新增的气压机(机503/4)进DCS的自控方案,该方案自行设计组态、安装、调试和投用.该富气压缩机是离心式压缩机.因为喘振是离心压缩机所固有的特性,所以随动反喘振控制方案就是这次设计的核心.     

基于PID算法的机组载荷共享与防喘振控制

简单介绍了离心式压缩机的工作原理以及喘振的概念、成因和可能造成的危害。通过对单台机组防喘振控制系统组成和控制方式的描述，介绍了基于PID算法的多台压缩机组防喘振控制系统的组成和参数整定。应用单独的PLC系统，实现了多台并联压缩机组的载荷共享和喘振边界均等化，以避免机组的喘振，达到工艺的安全平稳。     

基于IPC的空气压缩机数据采集和压力控制系统

介绍了应用工业控制计算机、交流变频调速器以及参数传感变送器组成的空气压缩机数据采集和控制系统，阐述了系统的硬件工作原理、软件设计方法和可靠性设计措施，给出了温度、压力检测和信号调理电路，系统实现了对空气压缩机的主要运行参数的实时数据采集和压力控制，使用结果表明，系统精度高，功能强，可靠性好。     

A surge and choke capable compressor flow model—Validation and extrapolation capability

Increasingly stringent emissions legislation combined with consumer performance demand has created the need for complex automotive engines. The control of this complex system relies heavily on control oriented models. Models capable of describing all operating modes of the systems are beneficial, and the models should be easily parametrized and enable extrapolation. A large database of automotive compressor maps is characterized, and used to develop, validate and automatically parametrize a compressor flow model capable of describing reversed flow, normal operation and choke. Measurement data from both an engine test stand and a surge test stand is used to parametrize and validate the surge capability of the model. The model is shown to describe all modes of operation with good performance, and also to be able to extrapolate to small turbo speeds. The extrapolation capability is important, since compressor maps are shown to lack information for low speeds, even though they frequently operate there in an engine installation.     

基于PLC的煤矿压风机自动控制系统

针对煤矿压风机采用人工就地控制方式存在的问题,介绍了一种基于PLC的煤矿压风机自动控制系统的设计。该系统以PLC为控制核心,实现了参数采集、数据处理、数据上传、故障报警、自动控制等各种功能,还实现了煤矿压风机的无人值守,为实现数字化矿井打下了良好基础。     

Memorizable interactive proof and zero-knowledge proof systems

Interactive proof and zero-knowledge proof systems are two important concepts in cryptography and complexity theory. In the past two decades, a great number of interactive proof and zero-knowledge proof protocols have been designed and applied in practice. In this paper, a simple memorizable zero-knowledge protocol is proposed for graph non-isomorphism problem, based on the memorizable interactive proof system,which is extended from the original definition of interactive proof and is more applicable in reality.