The Design And Implementation Of Boiler Automatic Control Systerm Based On LABVIEW

In various fields of human society, the automatic control system has been widely used, the boiler control system included in it. However, our boiler late start, and there are some problems:the level of control is not high, algorithms is rough and simple, ineffective control, the output is easy to produce oscillation and overshoot large. Therefore has great significance for the study of the boiler automatic control system.This article subject from the Huang Gang Yili coal-fired steam boiler PLC control system. Design of the boiler automatic control system based on LabVIEW, a coal-fired steam boiler, by experiment, looking for a better control scheme to adjust the time is short and small overshoot performance of the system is stable. Generally speaking, the boiler system including combustion system control and water level drum control of two parts.The coal feeding system, air supply system and wind system are three important aspects of the boiler combustion system. In LabVIEW development platform, the host computer as a master device and collected by the sensor furnace temperature, pressure and oxygen content to adjust the boiler to the amount of coal, air supply, and pull air volume, so as to achieve the best thermal efficiency. And use computer-controlled inverter speed control the speed of induced draft fan, blower and stoker motor coordination, in order to achieve the rapid response, precise adjustment of the control effect.Drum water level control system using Fuzzy-PID control, fuzzy control and PID control. In fuzzy control, the positive changes in the value of the input variables for the drum water level deviation e and deviation ec, the output variable is the adjusted value for the PID parameters. In PID control section, the water level setpoint and PID parameter settings as input variables, and output is the water valve signal.LabVIEW has a strong computing power and analysis capabilities, the host computer using LabVIEW software as a development platform to achieve the graphical display of real-time monitoring platform. Boiler control system monitoring interface based on LabVIEW is friendly, easy to operate, reliable operation.