Design On Application Of Gas Boiler Combusion Control System

The gas boiler is a kind of highly efficient energy conversion equipment,has extensive use in industry and life,and it is bound to replace the coal-fired boiler.This not only because of the superior performance of gas boiler,more to the point is that its excellent environmental protection.Early coal-fired boiler in the boiler industry proportion is very high,with environment for the economic benefits,also caused serious damages to the environment.In recent years,the country's development has attracted worldwide attention,growing environmental problems,so the state policies to make up,the "coal to gas" plans to gradually expand in the major cities;t is to use high quality environmental protection of the natural gas of gas boiler to replace inefficient pollution of coal-fired boiler.This article is to gas boiler as the carrier,and design a relatively overall control system.First,this paper studies the running mechanism and burning process of the gas boiler.Gas boiler is to burn a certain proportion of mixed gas and air,produce heat.Through the pipeline to send heat to the user or industrial production.In this paper,the purpose of design is to ensure that the air-fuel ratio keep a constant,in order to be environmental protection,energy saving and efficient.So,choose one of the most appropriate algorithms and improve the Air-fuel ratio as its control core.And then,after determining the research focus,this subject has done further analysis to the combustion control system,Through the analysis and research,the control structure of the combustion control system is determined,and the simulation model is established.The water temperature is the controlled object,the fuel part and the air supply part together.In this way,in order to make the air-fuel ratio reach the dynamic optimum,the detection feedback of the flue gas oxygen content is added..Secondly,with the help of a Samsung S3C2440 microprocessor as the core of TQ2440 development board,gas boiler combustion controller and peripheral circuit is designed.In addition to the minimum system,power supply circuit,reset circuit indispensable is provided by the development board,the digital quantity acquisition circuit,A/D circuit,D/A conversion circuit,relay drive circuit,LCD interface circuit,key circuit,LED circuit are designed in this paper.And use Altium Designer 10 to complete its principle diagram and PCB design.Finally,with intelligent trend,the design of the software transplant the real-time multitasking operating system uC/OS-III and uC/GUI graphical user interface.Real-time multitasking operating system uC/OS-III transplantation not only improves the reliability of the control system,but also divides the priority task,make the programming more organized,and facilitate maintenance and transplantation.Thetransplantation of uC/GUI graphical user interface simplifies the underlying graphics LCD driver writing,directly call uC/GUI rich function library,enable to draw the elegant interface,greatly enhance the efficiency.