Patent GB-721384-A (GB)
Title: Improvements in or relating to liquid fuel burners
IPC: F23D11/10
Filed: 1952-04-17
Abstract: 721,384. Liquid-fuel burners. BABCOCK & WILCOX, Ltd. April 17, 1952 [April 17, 1951], No. 9663/52. Class 75 (1) [Also in Groups XII and XXIX] In a spray burner in which atomizing fluid is discharged through passages circumferentially distributed around and opening into a whirl zone of a fuel discharge orifice, the passages comprise two differently oriented sets, the passages of each set being similarly oriented relatively to the longitudinal axis of the fuel discharge orifice, so that the atomizing fluid jets produce a number of localized swirls and also a spinning effect in the fuel stream discharged through the orifice, and extensions of the longitudinal axes of pairs of passages, taken one from each set, intersect between the longitudinal axis and the periphery of the orifice. Liquid fuel is fed through a tube 48, Fig. 3, to a nozzle 51 threaded thereon and discharges through a central bore 63 in an atomizing plate 56 and an outwardly flaring aperture 65 in a tip member 57. Atomizing fluid is supplied through a surrounding coaxial tube 47 through ports 55 in a flange 52 on the nozzle 51 to an annular chamber 54 in the front face of said flange, thence through ports 62 in the atomizing plate 56 to an annular chamber 61 in the front face thereof and thence through swirl passages 64 to atomize the liquid fuel passing through the bore 63. The passages 64 are elongated parallel to the bore 63, being milled in the front face of the plate 56 to the same depth as that of the annular chamber 61, and are arranged in pairs, 64A, 64B, as shown in Fig. 4, with the extensions of the longitudinal axes of each pair intersecting between the longitudinal axis and the periphery of the bore 63. In a modification the tip member is provided with four spaced ports connecting with the annular chamber 61 and adapted to discharge atomizing fluid into and tending to recompress the atomized fuel stream to protect the surface of the tip member against erosion. The ports are so directed as to swirl the atomized fuel in the same sense as the swirl imposed by the fluid jets discharging through the passages 64. A plurality of burners may be mounted in ports 16, Fig. 1, in opposite side walls of a furnace 10 for heating a vapour generator 20 by the combustion of a residual liquid resulting from the digestion of cellulosic material in a magnesium base liquor for the conversion of the magnesium in the liquor to magnesium oxide. The furnace 10 is lined with refractory materials containing a high proportion of alumina, the rear wall 11 consisting of refractory blocks supported upon fluid-cooled tubes 12 having a gas outlet 13 adjacent the furnace floor 14 formed of hollow tiles 15 through which preheated air is supplied by a duct 17 to discharge into the combustion gases passing through a duct 18 from the furnace 10 into ducts 21, 22 of the vapour generator 20. Thence the gases pass through an air heater 24 and are treated in a supplementary system (not shown) for the separation of magnesium oxide and the absorption of sulphur dioxide in wash liquid. Air is supplied by a blower 25 through the preheater 24 and a duct 26 to branches 17, 27, 28, the branch 27 leading to the burner parts 16 and the branch 28 to a manifold 30 and pipes 31 to discharge into the gas stream entering the duct 21. Specification 548,873 is referred to.