Patent GB-581990-A (GB)
Title: Improvements relating to projectors for liquid and pulverulent or small material, and methods of manufacture utilising the projectors
IPC: F23L17/00
Filed: 1943-09-24
Abstract: 581,990. Charging furnaces. HIGGINSON, G.S., and ASHBY, G. S. M. Sept. 24, 1943, No. 15725. [Classes 51 (ii) and 55 (i)] [Also in Groups II, XI and XXIX] Liquid material and/or pulverulent, granular, powdered or like divided material are mixed together and with air, gas, or steam and projected in jet form by directing towards each other, through slot-like nozzles, jets of considerably greater length than width comprising the materials and the air, gas, or steam so as to impinge long edge on, the air, gas or steam being the impellant. When particles of any liquid which may exist in the jets impinge they. are further disentegrated or atomised. The method may be used in the manufacture of quick-lime and cements or for reducing metal oxides or for carbonising coal. The materials are projected in finely divided form into a heated chamber in which the treatment is to be effected, and air, gas, or steam, as may be necessary for the treatment, is included in one or more of the nozzle jets, or may be introduced separately into the chamber. For example, one or more jets may comprise limestone, and another or other, coal. A projector in accordance with the invention may comprise two or more cylindrical rotors in which are a number of angularly displaced longitudinal pockets each adapted to receive in turn from a hopper material to be projected, pressure fluid means being supplied, through a valve, to the vicinity of the pocket bottom, when each pocket attains a predetermined angular position during turning of the rotor, to empty the pockets successively. Such a projector may be used as a burner for liquid, pulverulent or colloidal fuel, or for a mixture of such fuels, such as anthracite dust and bituminous fuel, primary air for the combustion being supplied with the fuel, when air is used wholly or in part as the fuel impellant for one or both of a pair of opposed jets. If steam is supplied as the impellant, water gas may be formed on the furnace. Primary air and/or steam may be supplied through a nozzle independently of the fuel jets, Figs. 1 and 4 show in elevation and cross-section a projector comprising two similar cylindrical rotors 15, 16, mounted in bores 2, 3 in a casing 1 having two mouths to which solid material to be mixed is fed in divided form from a hopper (not shown, which may be divided), and a divergent discharge opening 6. A liner 8 is disposed within the case 1 around the rotors with substantially radial passages 12, 13 leading to the opening 6 through main nozzle opening 11. The rotors have reduced end portions 18 which lie between a central part 17 and valve plates 19, 20, and further reduced portions 21 which extend through the plates 19, 20 and a bearing 22 which supports the rotor. Projecting ends of the parts 21 carry toothed wheels 26 which intermesh and which are driven from a main worm shaft 32 through worm gearing, to turn the rotors 15, 16 in opposite directions. Pockets.37 with rounded bottoms and diverging sides are formed in the rotors, the medium planes of the pockets preferably being .tangential to a circle concentric with the rotor axis so that the mouths are in advance of the bottoms in the direction of rotation. Conduits 39 leading to each pocket are bored and slotted in each rotor. Pressure fluid is supplied to intercommunicating chambers 60, 61 by a plug valve 40 mounted on an end cap 41 of the case 1, the valve preferably being such that fluid from either of two inlets can be supplied to both rotors, or each inlet may supply a separate rotor. The valve 40 communicates with the chambers 60, 61 through outflow passages 42, 43 which lead to chambers 44, 45 in end plates 23, 24 respectively, and passages 46, 47, 48, 49; and the arrangement is such that pockets 39 in register or about to register with the nozzles 12, 13 receive charges of pressure fluid. The zone at which the pockets for each rotor registers with the chambers 60, 61 is angularly adjustable by connecting rods 70 which are connected to the valve plates, 19, 20 at their small ends and contain at their big ends eccentrics, the shafts 73, 74 of which are rotatable by handles 76. The relative incidence of the nozzles 12, 13 may also be adjustable by making the liner 8 in two parts each adapted to be turned round the rotor axis.