Converging-diverging type gas-solids fluidizer.
U S Pat 3 565 593 1971 Feb; :
Coal is treated with superheated steam at up to 2,010 deg. F and up to 100 psi in a fluidized bed (4-in diam), which had a converging- diverging-type nozzle at the bottom. An expansion height of approximately 16-20 in was maintained in the reactor over a range of fluidizing gas flow varying by a factor of 10.
U.S. Pat. 3,565,593; Feb. 23, 1971; Chem. Abstr. 74:89,032K