| Boiler burning control system had many larruping traits: badly coupling, multi- interfere, typical nonlinear. PID (Proportional, Integral and Derivative) control arithmetic has been used in SHUGUANG radio tube Factory of Changsha on its 20T/h Boiler, with inefficient effect. For above reason, a new "theory with practice" mixed control technique has been proposed in this paper, which combined PID control and front compensating feedback control with expert control. The new technique gathered the simplicity, credibility, counter-disturbance and agility up of the above control methods, brought strongpoint of each into play, which created another way for industry control. When inheriting the advantages of the original system, serial control in front compensating feedback control arithmetic has been introduced, aiming to better manipulation and heat efficiency. Software engineering and waterfall model which composed of project definition, feasibility analysis, demand analysis, synoptic design, detailed design, coding and test, running and maintenance has been used to develop the system. The C++ Object-Oriented programming language and Visual C++ Studio tools have been used in the design. Then the monitor system has been redesigned, the UI has been consummated, and the codes of parameters-control subsystem, report forms subsystem and help files has been rewrote. At last, Install Shield software has been used to release the project so that users could process selective installation without Visual Studio, which could extracts DLL files needed by the system. Also a doable way has been brought forward in the paper to add remote control subsystem and redundant subsystem, which can be considered as a factor when upgrading the hardware system. The system was then put to use, and ran well. It's proved that the goal has been successfully achieved and good economic and social profits have been brought to the factory. |
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