Study On Large Flow Regulator Valve Constant Pressure Control Technique

Control technique of high flow gas/hydraulic pressure regulator valve was widely used in the national economy. However, due to the present state of China's manufacturing industry, it was difficult to settle such a problem that most of China's enterprises import more and more foreign high performance regulator valves. China needs to research some advanced control technology of high performance control valves. It is a comprehensive analysis about China's tradition regulator valve and foreign advanced high performance regulator valve in this article. Priority research point of this article is large flow regulator valve constant pressure control technique. Ultimate goal is to exploit a high performance large flow regulator valve, and make the regulator valve to adapt steel works combined cycle electric power generation.First, the large flow regulator valve constant pressure system is designed. Consider the physical circumstance of enterprise. Aim at data determined for steel works. Combine testing system of established by laboratory. Understand model number and specification of experimental installation, which was used in laboratory. On this basis, a new idea came up, this is use of large flow regulator valve with electro-hydraulic servo control system instead of gas-pressure regulator in many large steel works. Establish a large mixed gas regulator valve system experiment platform, and determine the experimental parameters, and have a preliminary selection of machine. All of these processes have a guiding significance for the future actual experiments.Second, establish a large flow regulator valve mixed gas constant pressure system model. Use the equation of flowed continuity of fluid cylinder choke and equation of dynamic balance of fluid cylinder and loading and equation of stress unbalance of spool and transter function of electrohydraulic servo valve and so on to determine the dynamic characteristics of hydraulic cylinder of valve control. Accord to large flow regulator valve mixed gas constant pressure system equations to establish large flow regulator valve mixed gas constant pressure system transfer function. Then establish control block chart of system.Third, based on system design and mathematical model, gave a MATLAB/Simulink dynamic response emulation analysis for large flow regulator valve mixed gas constant pressure system. The analysis includes two parts, traditional PID control system simulation emulation analysis and fuzzy PID control system emulation analysis. According to emulation of system and combining the low response and response lag problem of large gas pressure regulator valve which happened in field engineering, find the difference between traditional PID control system emulation analysis and fuzzy PID control system emulation analysis. According to the fall short of the two different emulation analysises, the conclusion of merits and drawbacks of two different emulation analysises were got. This trial of using fuzzy PID control strategy to control the experimental system is successful. It is a guide for the subsequent using of Siemens PLC parameters self-adjusting function.Fourth, the experiment system was emulated based on ABB Industrial IT AC800F control software. The objective is to test the accuracy of the experiment system model. According to the traditional PID control system emulation analysis, prove that traditional PID control can astisfy the basic experimental system requirements.