Patent GB-116502-A (GB)
Title: Improvements in or relating to Feeding Devices for Pulverulent Fuel.
IPC: F23K3/00
Filed: 1918-06-05
Abstract: 116,502. Motala. Verkstads Nya Aktiebolag. Dec. 31, 1914, [Convention date]. Fuel, feeding.-Relates to air-current feeding-devices for pulverulent fuel, a large number of modifications being described principally in connexion with locomotives. In the form of the invention shown in Fig. 1, the furnace draught draws air through the valve 47 and tube 41 and also through an inlet 49; the air passes from the tube 41 through the annular opening 42, and entraining the dust passes into the fuel and air pipes 43, 44. The pipe 43 and a damper 45 are adjustable by means of a handle 46, and may be moved until the tube 43 engages with the cone 42 and cuts off the fuel supply. Fig. 2 shows an adjustable air nozzle 58 the upper end of which consists of disks and rings 59 forming slots from which the air flows into the fuel and into the fuel and air pipe 1. These rings may be flanged so as to discharge the air downwards. Fig. 3 shows an apparatus wherein a ported disk valve 67 admits air firstly to pipes 73, 75, 78 and to the hopper in order to stir up the fuel, secondly to a pipe 68 axially beneath the fuel and air pipe 1, thirdly in succession to pipes with ring- shaped ends 90, 91, 92, perforated or slotted on their inner faces, which deliver air to stir up the fuel. In a modification, the pipes 68, 91, 92 are mounted on a casing fitted at the bottom of the hopper and provided with one air-supply pipe; the ports leading from this casing into the pipes 91, 92 are fitted with differently loaded valves which are raised by the pressure of the air, so that the air flows through and from the pipes 68, 91, 92 in succession. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the following further subject-matter of similar character. A pump 66, Fig. 1 (cancelled) and reservoir 100 supply air through pipes 9 to a nozzle 4, which is adjustable by a handle 6 and induces a flow of coal dust into the pipes 1 leading to the firebox. The nozzle 4 emits numerous fine jets of air, which serve to stir up the dust, and also serve to clean the pipe or conduit 1 if the nozzle is adjusted until it touches the inlet end of the pipe &c. 1. If the fuel in the hopper ceases to flow, the cock 101 is shut and the valve 12 opened; the air blast then lifts and stirs the fuel until it runs freely again. Figs. 3 (cancelled) and 4 (cancelled) show different forms of nozzles. Fig. 5(cancelled) shows a pipe 4 with air-discharge openings 5 remote from the fuel and air pipe 1. Fig. 6 (cancelled) shows an air pipe 97 with a branch 105 perforated at 5 so as to stir up the dust and to direct it to the opening 111 in the fuel and air pipe 1, where it meets the main blast from the pipe 97. In another modification, Fig. 12, (can. celled) the air pipe 4 is inside and is axially adjustable in the fuel and air pipe 1 by means of a handle 13. In another modification, an annular air conduit surrounds the fuel and air pipe 1, and has a truncated conical and perforated outlet. The outlet from the air pipes may be conical, hemispherical or flat, in each case being finely perforated, or the ends of the pipes may be closed and formed with one or more lateral openings. Fig. 20 (cancelled) shows a modification wherein the air pipe 4 and the fuel and air pipe 1 are both arranged beneath a plate 9 inserted in the hopper so as to prevent the fuel from falling directly into the conduit 1. This subject-matter does not appear in the Specification as accepted.