Patent GB-191306639-A (GB)
Title: Improvements in or relating to Furnaces for Pulverous Fuel.
Inventor: PORAT KARL HJALMAR VILHELM VON
IPC: F23C99/00
Filed: 1913-03-18
Granted: 1913-12-11
Abstract: 6639. Porat, K. H. V. von. March 18. Pulverulent-fuel furnaces.-In furnaces of the kind in which powdered fuel is injected against baffles and arches which are first heated for the purpose of starting the furnace and more particularly of the kind adapted for application to locomotive boilers and for burning powdered peat, a number of arches or vaults are provided and inclined downwards towards the back of the fire-box so as to form a long sinuous passage for the burning fuel, and a subsidiary fire-box fed with solid fuel is arranged within the main fire-box for use during starting or when the supply of pulverulent fuel is stopped. In the furnace shown in Figs. 1 and 3, the fuel is fed from a receptacle 5 on the tender to the pipe 7 open at 15 to the atmosphere and provided with an injector 14 for supplying steam or compressed air for feeding the fuel to the passage 10 extending towards the channel 2 and communicating with the air-supply casing 9. The channel 2 is formed by a hollow vault 1 and is provided with an air admission passage 36. After leaving the channel 2, the combustion products pass forwardly beneath the arch 3 and finally over the top of it, as indicated by the arrows, to the boiler tubes. The arch 3 may be built up of blocks 35 arranged as shown. Vertical partitions may be arranged between the arches 1, 3 to form two or more channels side by side. Air-admission openings 20 are arranged in the bottom of the fire-box at each side of the vault 1. The subsidiary fire-box 12 for burning solid fuel is arranged beneath the channel 10 and is supplied with air through the channel 34. Liquid or gaseous fuel may be fed to the furnace through the pipe 13. In a modification, the arch 3 is separated from the arch or vault 1 so that the flame is in contact with the whole upper surface of the arch 1. Fig. 7 shows a further modification in which the arches 1. 3 extend across the whole width of the fire-box. both arches being built up of blocks such as 35 arranged to overlap. A tubular air-heater is arranged above the furnace having tubes 27 through which exhaust steam passes and over which the air to be heated is passed to the furnace in the direction indicated by the arrow. In the modification shown in Fig. 9, the arches are arranged in a casing 16 of sheet metal so that they may be inserted or withdrawn as a whole. The arch 1 does not extend to the rear wall of the fire-box but downward to the bottom and the gases pass in the direction indicated by the arrow. In a further modification shown in Fig. 12, one arch or vault only is provided with a channel 17, and passages at the sides of the upper arch 1 allow the gases to pass in the direction indicated by the arrow. Fig. 17 shows a modification in which the arches 1, 3 are separate and the sides of the inner end of the arch 2 are extended laterally to meet the side walls of the fire-box. The air inlet 21 is provided with a damper 22 arranged above the tube 7. Fig. 19 shows a grate 23 for burning solid fuel arranged behind the vault 1, which is curved as shown, and the fuel is fed to the channel 2 from below. The fuel-pipe 7 may extend over the grate 23 and into the channel 2. The fuel-pipe may also be arranged to deliver at the top or sides of the furnace, or it may be arranged within a vertical conduit situated in the front or rear wall of the fire-box.