counter flow u201d one of the objects of this invention is to maximize the amount of co flow between the burner gas stream and the process gas stream and minimize the amount of counter flow but not completely eliminate counter flow thus the incoming reformed gas stream in certain reformer gas stream components are subjected to heat exchange from both a co flow burner gas stream and heat exchange from a counter flow burner gas stream while others of the reformer gas stream components are subjected to heat exchange solely from co flow burner gas streams the co flow counter flow design results in a more complete transfer of heat from the burner gases to the reformer or process gas without the need to unduly enlarge the reformer assembly and also results in a lower burner gas stream outlet temperature the incoming process gas stream is also subjected to heat exchange from the outgoing regenerated process gas stream each module may contain two process gas stream components combined with one burner gas stream component as will be more fully explained hereinafter it is therefore an object of this invention to provide an improved heat exchange relationship between a burner gas stream component and a process fuel gas.