Abstract: To improve billet quality and the trackability and stability of secondary cooling water during continuous
casting, the superheat is introduced into the water distribution for secondary cooling to design the relevant control
system, based on the water distribution model, superheat and fuzzy self-adaptive PID (process identity) . A spray
cooling system is set up for simulation test in laboratory to test the step signal from the conventional, integral separated
and fuzzy self-adaptive PID controllers and the simulation casting. And the on-site test is done in some steel
plant. The test results show that the fuzzy self-adaptive PID controller's performance is better than that of the other
two controllers, which provides a basis for further study and application.
Key words: fuzzy self-adaptive PID; continuous casting; secondary cooling; superheat