三相电弧炉电极调节控制系统的鲁棒自适应控制

讨论了基于反馈线性化的鲁棒控制方法在在非线性系统控制中的应用.应用基于微分几何的反馈线性化方法将单相电极调节系统等价为完全可控线性系统,考虑三相耦合及弧长扰动的影响,设计了鲁棒自适应控制器,进行了MATLAB仿真.结果表明,基于反馈线性化鲁棒控制方法,可以有效克服三相耦合和弧长扰动的影响,在电弧炉电极调节系统控制中有一定的潜力.     

Mathematical Model on heat transfer of water—cooling steel—stick bottom electrode of DC electric arc furnace

For predicting and controlling the melted depth of bottom electrode during the process of steelmaking,the water-cooling steel stick electrode is taken as an example.to analyze the process of heat transfer,then 3D mathematical model by control capacity method is built.At the same time,the measurement on the melted depth of bottom electrode is conducted which verified the correctness of the built mathematical model.On the base of verification,all kinds of key parameters are calculated through the application and a series of results are simulated.Finally,the optimum parameters are found and the service life of bottom electrode is prolonged.     

电弧炉电极调节系统的满意度PID控制

电弧炉电极调节系统是具有强非线性及随机扰动的系统。在满意度PID控制方法基础上,对电弧炉电极调节系统进行了基于反馈线性化的满意度PID控制设计研究,并进行了单指标约束和多指标约束情况下满意度PID控制的仿真,验证了此控制方法的适用性,这对电弧炉电极调节系统及同类非线性系统的研究有重要意义。     

大型电弧炉计算机控制系统

介绍了大型电弧炉计算机控制系统的结构，主要功能及工作原理，并就系统软件ＡＭＸ及控制算法进行了讨论。     

Neural adaptive PSD decoupling controller and its application in three-phase electrode adjusting system of submerged arc furnace

Taking three-phase electrode adjusting system of submerged arc furnace as study object which has nonlinear, time-variant, multivariable and strong coupling features, a neural adaptive PSD(proportion, sum and differential) dispersive decoupling controller was developed by combining neural adaptive PSD algorithm with dispersive decoupling network. In this work, the production technology process and control difficulties of submerged arc furnace were simply introduced, the necessity of establishing a neural adaptive PSD dispersive decoupling controller was discussed, the design method and the implementation steps of the controller are expounded in detail, and the block diagram of the controlled system is presented. By comparison with experimental results of the conventional PID controller and the adaptive PSD controller, the decoupling ability, adaptive ability, self-learning ability and robustness of the neural adaptive PSD dispersive decoupling controller have been testified effectively. The controller is applicable to the three-phase electrode adjusting system of submerged arc furnace, and it will play an important role for achieving the power balance of three-phrase electrodes, saving energy and reducing consumption in the process of smelting.     

Arc deflection model and arc direction control for DC arc furnace

Based on the analysis of three-dimensional power conductor for DC arc furnace, the electric arc deflection model was set up and the control system of the arc direction was configured. According to the bus bar distribution at the bottom electrodes cooled by water, the arc direction control principle and its configuration were described, The simulation results show that the control system can restrain the electric arc deflection and control the arc direction.     

电弧炉电气系统谐波电流仿真研究

基于电弧弧长随机特性和电弧炉电气系统实际运行环境,使用简化的电弧电流电压特性,将电弧电压的时变性作为研究的重点,并采用自回归模型模拟电弧的随机性,建立了三相非线性时变电弧炉电气系统的MATLAB／SIMULINK仿真模型。仿真数据与实测数据比较,表明该模型适用于电弧炉电气系统谐波电流的研究。     

电弧炉电极调节系统的模糊控制

分析了电弧炉电极调节系统的非线性与三相耦合特征。采用了电路网络来模拟电弧炉主电路的非线性。在此基础上，针对控制对象的复杂性，采用模糊控制方法来对其进行控制，并用遗传算法对模糊规则进行了优化。采用Matlab6．5对电弧炉电极调节系统进行了模糊控制与传统PID控制的仿真。仿真结果表明：与PID控制比较，采用遗传算法优化后的模糊控制的控制效果是令人满意的。为电弧炉的控制提供了数字仿真支持。     

电弧炉的间接自适应模糊鲁棒控制

针对三相电弧炉电极调节系统的电极控制问题,设计了自适应模糊鲁棒控制器,给出了模糊鲁棒控制系统的详细设计过程.该方法考虑了跟踪误差和逼近误差对参数自适应律的影响,并对模糊逼近误差和外扰采用H∞补偿控制.仿真结果表明:该控制算法具有较好的动态响应和稳态控制精度,对外界干扰及结构参数不确定性具有很强的鲁棒性.     

交流电弧炉闪变及其影响因素分析

电弧炉在正常生产时会对电网产生以电压波动与闪变为主要特征的不利影响.根据弧长变化对电弧伏安特性造成的实际影响,提出以受控电压源的形式接入电力系统的电弧炉动态模型,可用来实现电弧炉电能质量的研究;并采用IEC闪变仪框图建立基于MATLAB的闪变测量模块,测量公共供电点的短时闪变值,分析电弧炉闪变的影响因素。分析结果表明,弧柱温度的波动区间越大,将产生更多的电压闪变.     

Zinc leaching from electric arc furnace dust in alkaline medium

Physical and chemical properties of electric arc furnace (EAF) dust from Tianjin seamless Pipe Company were measured and analyzed. The zinc leaching tests in alkaline medium were carried out under variation of leaching agent concentration, leaching temperature, leaching cumulative time and solid-to-liquid ratio. The thermodynamics and kinetics of the zinc leaching process were also analyzed. The results show that the EAF dust contains 10% (mass fraction) zinc and the median particle size is 0.69 μm. The zinc recovery of 73.4% is obtained under the condition of 90 °C, 6 mol/L NaOH, and 60 min leaching time. With the increase of concentration of NaOH and the cumulative time, zinc leaching will be significantly increased. The kinetics study demonstrates that the leaching reaction is chemically controlled and the reaction activation energy is 15.73 kJ/mol.     

单片机直流电弧炉电极调节控制系统

提供了双ＣＰＵ单片机结构在直流电弧炉电极调节器中的应用,介绍了系统的硬件、软件及控制算法．     

电弧炉电极调节控制器的设计与仿真

介绍了电弧炉电极调节系统的工艺概况,并给出了系统的数学模型。在MATLAB6．5环境下,通过编写和调试M文件,对电弧炉电极调节系统PD控制器进行设计与仿真。结果表明,基于MATLAB的仿真研究,能够直观、简便、快捷地设计出性能优良的控制器。     

微波碳热还原不锈钢厂电弧炉粉尘的热力学及实验研究

采用微波加热方法进行碳热还原不锈钢厂电弧炉粉尘,并计算粉尘中金属氧化物的理论开始还原温度。结果表明,微波碳热还原不锈钢厂电弧炉粉尘在热力学上可行。实际测量的粉尘中金属开始还原温度比理论计算值低。微波加热物料过程中形成的热点和电弧可能导致局部高温,有利于碳热还原反应的进行。在900℃下,有部分粉尘被还原,随着温度的升高,粉尘的还原程度增大。还原出来的金属相主要以Fe-Cr-Ni合金的形式存在,且成分分布不均匀,残余相主要以FeCr2O4、Fe3O4、CaSiO3、（Mg,Al）SiO3和CaMgSiO4形式存在。     

微机变频电弧炉电极调节器

介绍了微机控制变频电弧炉电极调节器的系统结构，工作原理及模糊控制算法。     

NUMERICAL SIMULATION AND ANALYSIS ON THE VELOCITY FIELD IN BATH OF A ROUND ELECTRIC CLEANING FURNACE

Theapplicationoftheelectriccleaningfurnacetotheefficientrecoveryofvaluablemetalshasreachedahighpointofdevelopmentinnonferrousmetallurgytoprocessslagbearinghighcontentofvaluablemetals.Asthesizeandratingofsuchfurnacescontinuetoincrease,theneedforasoundtheoreticalbasisforthedesignandtheoperationbecomesurgent.Theflowofliquidslaghasanimportanteffectontheheatetficiency,therecoveryratioofvaluablemetalsandlifespanoftheelectriccleaningfurnace.Atpresent,however,itisstilldifficulttomeasurethefluidvelocit…     

An intelligent decision support system (IDSS) in the operation process of electric furnace for cleaning slag

In this paper, the structure and function of the IDSS in the operation process of electric furnace for cleaning slag are presented and the fuzzy neural network decision model (FNNDM) in the IDSS is specially suggested. The IDSS possesses self-learning and adaptive properties, and has been used for managing and analyzing the optimal operational conditions since June 1992. Electric energy consumption has been reduced remarkably and the coefficient of recovery of cobalt and nickel has been increased. Synopsis of the first author: Peng Xiaoqi, associated professor, born in 1962, majoring research interests: modelling, optimal control and intelligent decision support system in technological process.     

钢铁厂电弧炉对配电网电能质量影响的预测与治理

电弧炉是供电系统各类功率波动性负荷中对电压特性影响最大的负荷．论文以具有多台电弧炉的某新建钢铁公司接人电网为例,分析了电弧炉的工作特性,并对配电网电压波动、闪变和谐波等电能质量指标进行了预测,提出了治理方案,计算和分析结果表明：SVC装置可以有效抑制电流谐波和电压波动．     

电弧炉氧化性炉渣发泡性能研究

通过对影响炉渣发泡的有关炉渣物性的分析，研究了电弧炉氧化性炉渣的发泡特性，指出炉渣碱度、渣中（FeO）及其它一些组份是影响炉渣发泡效果的主要因素。     

硅系合金生产中SiC的生成及其对炉内反应的影响

采用SEM,XRD等分析手段对矿热炉硅系合金生产中碳化硅沉积物进行实物取样分析,并与在不同条件下实验室合成碳化硅的规律对比,研究了中间产物碳化硅对硅系合金生产的影响.