GB190165A - Structure and method of operation of open hearth and other regenerative furnaces - Google Patents

Abstract

190,165. Kernohan, R. B., Lochhead, J. S., and Trinks, W. Dec. 8, 1921, [Convention date]. Liquid, gaseous, and pulverulent fuel furnaces. -In open-hearth furnaces using gaseous or liquid fuel, a short sharp flame of high velocity is produced in the furnace in the vicinity of the fuel and air ports by inducing one of the gaseous constituents of a combustible mixture and effecting its mixture with one or more other constituents by fluid jets of high velocity consisting of air, oxygen, steam or inert gases. Fig. 2 shows the application to a reversible regenerative openhearth furnace. Gas is supplied through passages 3, 6 and downwardly inclined ports 4, and air through passages 2, 7, 8 and downwardly-inclined ports 5 in the usual way. In carrying out the invention, jets of fluid of high velocity supplied by nozzles 19, preferably of the form shown in Fig. 6, induce a flow of air from the vertical ducts 7, 8 through downwardly-inclined converging passages 9, 10 leading into the central gas port 4. By regulating the valve 23 in the pipe 21 supplying the nozzles 19, the proportions of the air supplied to the port 4 and to the port 5 may be varied to vary the nature of the flame. Fig. 3 shows a modified form of furnace in which various fuels may be used. Liquid fuel such as oil or heated tar is supplied by a pipe 25 and gaseous fuel by pipes 26, 27 into the port 104 where it is met by air induced by jets of high velocity from nozzles 119, 120 to pass from the air ducts 7, 8 to ducts 109, 110 leading into the port 104. The flame from the port 104 is supplied with additional air from a port above. According to a further modification, the nozzles 119, 120, shown in Fig. 3, may be arranged at the entrance to the ducts 109, 110, and at the outlet ends of the furnace the flow of fluid from these nozzles may be maintained so as to partly or wholly prevent the escape of gases from the fuel port and cause them to escape through the air port. The Specification as open to inspection under Sect. 91 (3) (a) describes a regenerative ingotheating furnace, Fig. 6 (Cancelled), in which gaseous fuel is supplied through a pipe 31 and also through a pipe 327 which delivers into a by-pass 32 through which air from the regenerator 30 is caused to pass by compressed air delivered through the pipe 319. In a mcclification of this form of furnace, both the air and gas are regeneratively heated. A billet-heating furnace, Fig. 7 (Cancelled), is also described in which compressed air is delivered by a pipe 419 into the airuptake passage 407 leading from a regenerator or recuperator. Fuel is supplied by a pipe 427 into the chamber 404. The use of pulverized fuel is also referred to. This subject-matter does not appear in the Specification as accepted.