System and method for regulating and controlling pH value of dephenolization device

The invention discloses a system and method for regulating and controlling the pH value of a dephenolization device, and relates to the technical field of pH value regulation and control. Firstly, the real-time pH value of mixed feed liquid in a pipeline is measured, and a pH regulation and control target value is generated by taking a pH value controller AIC as a controller playing a real-time management and control role on the whole; the pH regulation and control target value and the flow of the acid solution are jointly used as input of a ratio controller, flow regulation and control of the alkaline solution are guided on the basis of the ratio of acid and alkali variables, and therefore the pH value is controlled in real time. The defect of non-linear change of the flow of an acid-base solution caused by a traditional mode of manually regulating feed liquid addition and decrement only by taking a measured value of a pH value online measuring meter as a reference is overcome, the phenomenon of large fluctu