GB496146A - Improvement in method and burner for effecting combustion - Google Patents

Abstract

496,146. Furnaces. FORRESTER, H. J. C. (Selas Co.) June 7, 1937, No. 15742. [Classes 51 (i) and 51 (ii)] [Also in Group XI] A combustible gaseous mixture is supplied to a ring, or two parallel rows, of burner outlets at the bottom of a cup-shaped, or trough-shaped, refractory combustion space so that the flames extend along, and heat to incandescence, the adjacent portions of the walls without the inner flame cones impinging thereon. The flames diverge from the axis of the cup, or from a central plane through the trough, at an angle of 35 to 70‹, preferably about 45‹. In one form, the refractory cup B, Fig. 1, is supported by a metallic burner body A, in which is screwed a refractory tip C provided with longitudinal grooves C<4>, C5 to form the burner outlets. The combustion products circulate in the cup B so that a neutral, oxidizing or reducing atmosphere may be maintained therein. A plurality of the burner units may be arranged in rows in one or more walls of a furnace. The tip C may be mounted directly in an axial passage in the cup B, the outlets being formed in the tip or the cup, and the cup may be covered by a hood or dome of quartz or a heat-resistant alloy provided with outlets for the combustion products or it may be closed by a plate of such material, an axial discharge passage being provided in the tip. Fig. 7 shows a burner unit embodied in a crucible furnace, the upper part BC of which is detachable from the base BC<1>, provided with discharge outlets BC<2>. The furnace may be inverted and the crucible supported on the tip C. In a melting furnace, Fig. 8, the tip CD is formed with an axial discharge passage CD<1> and is mounted in a metallic burner body AD. The upper part BD may be provided with a stationary stirring member BD<3> and the hearth bd rotated for agitating the molten material. In the form shown in Fig. 16, the tip CG is formed with radial slots C<25> extending from an axial passage C<26>, and, in a metallic burner, the tip CG may be provided with a heat-insulating cap CG<10> and the body with a channel AI<10> for cooling fluid. In the form shown in Fig. 17, the tip CH, provided with inclined outlet slots C<51>, is held against a conical seating on a tubular refractory body ch by a nut C<55> on the stem C<52>. The shank is preferably of polygonal cross-section and is spaced from the body ch by three or more ribs on the latter. Radial grooves C<56> in the lower end of the body ch, communicate with the central bore. In the elongated burner unit shown in Fig. 14, the tip CH is provided along either side with a row of outlet slots C<30> and is cut away to fit in the body AB in the trough BH. Fig. 10 shows a tubular furnace BF fitted with an elongated burner having a tip CF with two rows of staggered outlets C<20>.