Study On Boiler Drum Level Control System

Boiler is an important power equipment, the requirement is the supply ofqualified steam to adapt to load. To this end, the production process of all majorprocess parameters must be strictly controlled. The boiler water level control systemis the production control system is the most important aspects，boiler is a specialequipment is used in industrial production equipment. If the boiler is unreasonable,mismanagement, misconduct, production operation often lead to accidents. Most ofthese incidents was due to improper boiler water level control, you can see theimportance of the boiler control system in the boiler drum water control, therefore,drum level control is necessary thermodynamic conditions to ensure the safe operationof equipment.The design of single chip boiler feed water through the drum level control systemfor pressure and differential pressure measurement, through the circuit can beconverted to a single chip digital signal processing through software operation, findthe water and reached the level of the difference between the normal water level value,then the control signal converted to analog signals using the circuit, through theimplementation of the drum water level control device.MCS-51series of microcontrollers in8051and the design of small systems isthe important part of the design. Two analog signals received before8051will need toconvert analog signals into digital signals, so the choices are8analog input channelsA/D0809, the output is8-bit digital output on receipt of8051. The design of an analogsignal output interface, to control the actuator to adjust the water level of the high andlow, this intermediate requires a digital signal into an analog signal link, the choicesare8-bit D/A0832, after the corresponding circuit switching can be a standard4~20mA current, thus completing the circuit.