The circulating fluidized bed(CFB)boiler has good adaptability and variable load capacity

but its large thermal inertia and hysteresis and strong coupling relations between parameters lead to difficulty in putting the automatic control function into service.Therefore

the 330 MW CFB unit manufactured by Harbin Boiler Factory was regarded as the control object

optimization on the major analog coordinated control system was performed

on the basis of ensuring the balance of material

heat and energy between the machine and furnace and so on.After the optimization

the response speed of fuel amount variation on the main steam pressure deviation was improved

and the strong coupling

large inertia and nonlinear of the main steam pressure

bed temperature and bed pressure were overcome.Moreover

the temperature and bed pressure of the CFB with double feet and double grid-plates structure were balanced.