PROGRAMMING THE AT89C51 TO CONTROL THE TEMPERATURE OF POWER STATION

Abstract

This research is to implement microcontrollers to control the superheated steam (main steam) temperature in power plants. There are many types of main steam temperature control, one of them is steam desuperheating by spray water injection. This approach is chosen because it is easy to implement, economic and gives an optimal control of steam temperature. Atmel microcontroller AT89C51 was chosen to build the circuit that controls the spray water. The control circuit actuates the valve opening to control the quantity of the injected water. A circuit with two inputs, one output and a display was built, one input is to read the actual temperature, the other for the reference temperature and the output one to control the valve of spray water, after processing both inputs. The software was written using assembly language and simulated by Keil µ Vison2. Also this program is used to assemble from the assembly language to the Hexadecimal file loaded into the microcontroller AT89C51 by Atmel programmer. The test was made and found time surveys need to verify the program. The circuit can also be programmed to control temperature, level and pressure after modifying the control program.