Steel mills produced a large number of coke oven gas and blast furnace gas in the production. In order to reduce the pollution of the environment, some steel mills will coke oven gas and blast furnace gas, the mixed gas as a gas and steam combined cycle power generation fuel. The gas turbine of the mixed gas pressure control requirements are relatively high, the steel mills all through the valve pressure of mixed gas control. The choice of control related to the control valve pressure control performance of the control valve. PID control algorithm is simple, high reliability, it is widely used in process control and motion control. However, practice shows that, due to the control process of gas pressure is nonlinear and time-varying uncertainty, the application of conventional PID controller cannot achieve the [1-4] ideal control effect. Therefore, this paper design a suitable mixed gas pressure control occasions fuzzy PID controller.
The principle of gas pressure regulation valve system
Figure 1 is the schematic diagram of gas pressure regulating valve system. Regulating valve regulated system work, start the hydraulic pump 2, and the electromagnetic valve 10 solenoid is energized, the whole electro-hydraulic system work in the setting pressure, adjusting the overflow valve can change the work pressure of hydraulic system. PC according to the system settings, in the form of analog signals output control signal, so that the servo valve 8 left electromagnet. Left into the hydraulic cylinder hydraulic oil hydraulic pump out the left chamber through the servo valve 8, push the piston moves to the right, regulating valve 17 to open. Real-time detection of gas pressure sensor pressure, and the pressure signal is input to the PC controller. Comparing with the set value, the controller outputs the signal to the servo valve. Servo valve according to the signal symbol came and size determine the movement direction and displacement of piston, the adjusting valve opening size, until the gas pressure reaches the set value.
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