The industrial production is the lifeline of the country's economic development

and the process control plays an important role in industrial production. Inevitably

the actual industrial process control systems are time-delay system. Besides

there are more than one controlled variable in most of the industrial production processes

and these controlled variables are coupled. All of these factors result in a huge difficulty to build an exact mathematical model for the control system

indicating that the tradition control methods cannot meet the control requirements nicely. With model-free adaptive control (MFAC) method

controller can be directly designed without exact model to reach the control objectives. Given the large time-delay of CFBB

the control law in MFAC is analyzed by changing the period of D-value

and control algorithm should be improved by increasing the period of D-value. Then

the decoupling control strategy of MIMO can be achieved. In the end

taking the circulating fluidized bed boiler combustion process as example

the MATLAB computer simulation results show that the algorithm has better control effect.