Recent interest in dry sorption processes for SO2 removal from hot stack gases has led to investigation of the concept of a dry granular bed device used as a simultaneous SO2 sorber-flyash collector for power station flue gases. In these devices, an SO2 sorber such as alkalized alumina would also act as the granular collecting particles for flyash. A survey was undertaken in order to identify the most likely candidates among granular bed devices for power plant services. Most of the devices considered were panel filters, in which granular material filled a narrow vertical shaft. Mathematical models for SO2 sorption on alkalized alumina were developed for counterflow, crossflow, and fixed bed contactors. Calculations using these models indicated that there was no critical problem with regard to removal of SO2 at conditions which the developer of a particular device considered good for dust collection. Mechanical layouts were developed to enable preliminary comparative cost estimates to be arrived at. Cost estimates were made for the devices considered both as sorber-collectors and as dust collectors alone. Values of both capital and operating costs for the granular devices were of the same order as published estimates for other SO2 removal systems. Estimated costs for granular devices as dust collectors alone were of the order of cost for electrostatic precipitation equipment. (Author)