Scale-up of circulating fluidized bed combustion

Tests on large circulating fluidized bed boilers are extremely expensive an d computer modeling is not yet reliable. The paper tries to answer the ques tion: Can tests on laboratory-scale equipment be scaled to satisfy the need for information? Criteria for combustion scaling are defined in the form o f two Damkohler numbers: one for processes in the vertical direction and on e for the horizontal direction. Examples are given to show the outcome of c ombustion modeling. It is concluded that it is possible to reasonably well model the combustion process in the vertical direction by providing suffici ent residence time in the riser, but in a laboratory device it is not possi ble to model the horizontal combustion processes, except in special cases.