Studies in char gasification-V. Ash recirculation model

The fundamental idea behind processes that eliminate the need for an oxygen plant is to couple a gasifier and a combustor by means of circulating solids. In this paper, the simplest possible reactor unit that retains this fundamental idea is analysed. Two nonslagging fluidized beds of char, a gasifier and a combustor, are connected by standpipes to introduce circulation. Analysis shows that this may be a viable process, at least theoretically. More theoretical work as well as experimental studies need to be done before a conclusion can be drawn.