F - Mech Eng,Light,Heat,Weapons – 27 – B
Patent
F - Mech Eng,Light,Heat,Weapons
27
B
39/46, 110/2.1
F27B 15/02 (2006.01) B01J 8/26 (2006.01) B01J 8/38 (2006.01) C22B 1/10 (2006.01) F22B 31/00 (2006.01) F23C 10/10 (2006.01) F27B 15/00 (2006.01)
Patent
CA 1076796
ABSTRACT OF THE DISCLOSURE This invention is concerned with a process for carrying out an exothermic reaction, such as the combustion of carbonaceous materials, in which a process of carrying out an exothermic reaction in which a combustible substance is burned in a bed of solids fluidized with a fluidizing gas in a fluidized- bed reactor, the solids entrained with the gas from the bed are separated from said gas in a separator, and the separated solids are returned to the fluldized-bed reactor through a recycling conduit, the reactor, separator and recycling conduit forming a circulating system for the solids, said process comprising the steps of: (a) feeding an oxygen-containing gas into the reactor on different levels in two partial streams, whereby at least one of these streams is constituted as secondary gas and is introduced at least at one location above the level of intro- duction of fluldizing gas into the reactor; (b) maintaining the volume ratio of fluidizing gas fed to the reactor and secondary gas between 1:20 and 2:1; (c) introducing these gases into the fluidized-bed reactor so that the fluidized bed has a continuous solids density gradient from its bottom to its top, and has a mean density of the suspension above the secondary gas inlet of 10 to 40 kg/m3 (d) feeding the solids and the combustible substance into a space in the fluidized-bed reactor below the secondary gas in- let and substantially free from internal fixtures; (e) withdrawing hot solids from the circulating system; (f) cooling the solids withdrawn in step (e) by direct and indirect heat exchange in a fluidized-bed cooler; (9) recycling at least part of the cooled solids from step (f) to the reactor to maintain a predetermined constant reaction temperature therein; and (h) feeding hot gas from the fluidized-bed cooler as secondary gas to the fluidized-bed reactor
276428
Hirsch Martin
Plass Ludolf
Reh Lothar
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