۱٫ Introduction

۲٫ Mathematical Model of Water Supply System of Boiler

۳٫ Water Supply Controlling System of Boiler Based on AT89C55

۴٫ ۳Basic Theory of Fractional order PID Algorithm

۵٫ Controlling Simulation Analysis of Water Supply System of Boiler

۶٫ Conclusions

۷٫ References

In order to improve the controlling effect of temperature and pressure of industrial boiler and ensure the safety of it, the AT89C55 and fractional order PID controller are applied in it. Firstly, mathematical model of water supply system of boiler is studied. Secondly, the water supply controlling system of boiler based on AT89C55 is designed. Thirdly, basic theory of fractional order PID algorithm is put forward, and the improved genetic algorithm is used to optimize the parameters of it. Finally, controlling simulation analysis of temperature and pressure of boiler water supply is carried out, results show that the novel method has better controlling effect.

Introduction

The industrial boiler has large demand and extensive use, which has been applied in many industrial sectors, such as power generation, manufacturing and chemical industry. The industrial boiler is also one of important equipments in heat source power. Supplying steam required for load can ensure normal operation of boiler, the process parameters of each link should be controlled strictly. The main controlled variables of boiler system conclude drum water level, superheated steam temperature, superheated steam pressure, combustion air ratio, furnace negative pressure. Boiler feed water, lukewarm water flow and lukewarm water flow are main controlling variables. Currently, automatic controlling system of industrial boilers in China is not quite good, some boiler has also been controlled based on experience of boiler worker, and the combustion condition has not been controlled automatically. The working quality of boiler can not be ensured, and boiler accident may happen.