Patent GB-1110373-A (GB)
Title: Method of and means for cooling the inner wall of a combustion or reaction chamber with particulate material
IPC: F27D3/00
Filed: 1966-04-21
Abstract: 1,110,373. Cooling combustion or reaction chambers with charged material. E. VALLAK 21 April, 1966 [23 April, 1965], No. 17508/66. Addition to 1,100,919. Heading F4B. Combustion or reaction chambers are cooled by supplying them with a fluid stream of material in the form of a curtain between a central high temperature zone therein and their inner lining through holes in which (79, Fig. 1) combustion oxygen or air from a conduit (78) may be supplied. In the smelting reduction of iron oxide, ore from vibratory feeder 14 passes through chute 15 to the annular cavity 16 surrounding central water cooled drive shaft 17, to fall between lower and upper rotating discs 19, 20 respectively to be thrown out through radial channels 60 against surrounding deflecting screen 43 whence it falls as an annular curtain 24 into the chamber between the walls and the central high temperature zone. Due to centrifugal forces the coarser ore particles predominate on the outside of the curtain and these help to prevent the finer inner particles from being carried away by the exhaust gases. Further curtains (69, Fig. 5) of the ore, or of coarse grained sand which may be recirculated, may be provided to prevent entrainment of the finer particles. Variation of speed of rotation of the discs 19, 20 and of the proportion of coarse to fine particles in the ore supplied, permit control of the degree of cooling of the chamber. Cooling of the discs 19, 20 which are situated in the exhaust gas space 30 is effected by surrounding water jackets 54, 55 supplied from water connection 51 through hollow drive shaft 17, and which discharge through orifices 56 into stationary cooling tank 57. A gas seal 59 is provided between the stationary and rotating parts of the charging device 45. In a modification (Fig. 4) the ore is supplied to the discs (19, 20) through a central tube (62) in the hollow drive shaft (17) which is surrounded by external water jackets (64, 65) the lower disc (19) being protected by a ceramic covering (67). In a further modification, Fig. 2, the drive shaft 17 and upper disc 20 are cooled by water jackets 31, 32 supplied and discharged through inner pipes 33a, 33b respectively, while the lower disc 19 and deflecting screen 43 are cooled by stationary jackets 37 and 34, 35 respectively supplied and discharged from outer pipes 33a, 33b respectively. Jacket 37 which has dividing partitions 40 and is coated by a protective ceramic material 41 is connected to jacket 35 by inlet and outlet tubes 38, 39 respectively. A gas seal 36 is again provided between the stationary and rotating parts of the charging device 45. Wear on the discs 19, 20 and deflecting screen 43 may be reduced by backing them with magnets 44, 42 to form a thin protective layer of ore particles. Magnetic powder material may be added to non-magnetic ores for this purpose, or a sinterable material may be added to the ore. Alternatively the parts liable to wear may have a ceramic coating. The full charging device 45 may be pivoted about point 46 away from the gas outlet. The rotating discs may be replaced by rotating blowing nozzles.