Smooth combustion of gaseous fuels in a novel configuration of fluidized bed

► A novel configuration of fluidized bed has been developed and applied. ► Jet-fountain fluidized bed configuration consents smooth combustion of gaseous. ► A rapid reliable method for initial heating of fluidized bed combustor was confirmed. ► Staged air combustion technique has been applied using the novel configuration. ► The configuration reduces the power consumed in feeding gases to the combustor.