CAJ | 학술논문

pH 值控制广泛存在于石油化工、生物制药、污水处理、发电等诸多工业过程，其控制品质好坏直接影响整个系统能否长期、安全、稳定运行，因而十分重要。由于强非线性和大滞后等特性，致使其控制难度大，pH 值控制系统的设计一直是过程控制界的难点和研究热点。弄清 pH 中和控制过程的原理，并在计算机上模拟其控制过程及参数扰动的影响，对控制系统的分析与设计具有重要的指导作用。本文以废液中和处理系统为例，分析了溶液系统 pH 值和流量之间的非线性问题，讨论了在控制系统中将 pH 值变化转化为中和反应酸碱的流量变化的基本规律，给出了滴定特性曲线转化为酸碱流量变化规律的3种主要方法。最后在 MATLAB/Simulink 平台进行了 pH 控制系统设计及仿真，并对滞后时间参数进行了鲁棒性分析。结果显示，只要控制器参数整定合理，时间延迟不超过一定界限，PID 控制的控制效果能够满足实际要求。
pH 치공제엄범존재우석유화공、생물제약、오수처리、발전등제다공업과정，기공제품질호배직접영향정개계통능부장기、안전、은정운행，인이십분중요。유우강비선성화대체후등특성，치사기공제난도대，pH 치공제계통적설계일직시과정공제계적난점화연구열점。롱청 pH 중화공제과정적원리，병재계산궤상모의기공제과정급삼수우동적영향，대공제계통적분석여설계구유중요적지도작용。본문이폐액중화처리계통위례，분석료용액계통 pH 치화류량지간적비선성문제，토론료재공제계통중장 pH 치변화전화위중화반응산감적류량변화적기본규률，급출료적정특성곡선전화위산감류량변화규률적3충주요방법。최후재 MATLAB/Simulink 평태진행료 pH 공제계통설계급방진，병대체후시간삼수진행료로봉성분석。결과현시，지요공제기삼수정정합리，시간연지불초과일정계한，PID 공제적공제효과능구만족실제요구。
Nowadays, pH control finds application in a wide range of industries including petrochemical, pharmaceutical, wastewater-treatment, power generation and many other industrial processes. The performance of a pH control system directly decides whether the entire system can work on safe and stable status in the long-term and therefore is very important. However, in practice, to design a satisfactory pH control system is difficult because of built-in strong nonlinearity and relatively big lag time. In recent years, there are more and more researches associated with the pH control problem because of its industrial importance. Obviously, Understanding the principle of pH process control, realizing the corresponding simulation in a computer, and checking the effect of variable parameters on the quality of control are very important for the analysis and design of a pH control system. Taking wastewater treatment for example, the nonlinear problem between the pH of a solution system and flow is first analyzed. The change of pH in the control system can be transformed into a flow change based on the titration law. Three main methods of transforming acid-base titration characteristic curve into the flow variation into are then given. Last, the pH control scheme is designed and simulated in MATLAB/simulink platform. Its robustness to lag time is also analyzed. This results reveal that such a scheme achieve an acceptable performance when the parameters of a controller is adjusted on reasonable levels and the lag time does not exceed the upper limits.