Patent GB-121275-A (GB)
Title: Improvements in or relating to Feeding Devices for Pulverulent Fuel.
IPC: F23K3/00
Filed: 1918-09-11
Abstract: 121,275. Motala Verkstads Nya Aktiebolag. Dec. 6, 1917, [Convention date] Fuel, feeding.-Comprises a number of devices for feeding pulverulent fuel by means of air or " gaseous medium " forced or induced through n pipe entering a hopper containing another pipe in which the air and fuel are mixed, and means for regulating the fuel supply. Fig. 2 shows a device wherein an air-pipe 1 with a perforated end 6 is adjustable axially within a fuel-and-air pipe 2; as shown, it is withdrawn into an inoperative position; it may, however, be pushed towards the bottom of the hopper 5, so that air passing from the perforations 6 mixes with the fuel dust and carries some of it into the fuel and air mixing- pipe 2, and thence to the furnace. Fig. 3 shows a modification wherein the pipes 1, 2 are not concentric ; the tube 1 is supported in a fixed guide 43 and has a slotted end 11. Fig. 5 shows a modification wherein the perforated part 6 of the air-pipe 1 is adjustable within a sleeve 40. It may be pushed so far down as to cut off completely the air supply from the pipe 41 and to discharge from the aperture 42 dust which may have collected in the part 6. In a modification, Fig. 6, the discharge end 14 is connected to the axially-adjustable fuel-and-air pipe 2 as shown; the part 14 may be outside the pipe 1, instead of inside it. In the modification, Fig. 10, the discharge end 14 is fixed, and the outlet is adjusted by a sleeve 1 actuated by link gearing 13, 17. Fig. 12 shows a modification wherein a delivery opening 16 on the air-pipe 1 is regulated by a piston valve 14<1>; in this case, the air is supplied by the suction of the draught in the furnace. Fig. 13 shows a modification wherein air passes through openings 19, 20 in the end of the air-pipe 1 and in the piston valve 18; in similar constructions, the air may be delivered obliquely downwards, or vertically downwards through holes or channels, and is regulated by a piston valve. In other similar modifications, tha air passes vertically upwards through a single central aperture regulated by a lift valve controlled by mechanism 13, 17 such as is shown, or by a piston depressed by the air pressure against the action of a weak spring which tends to raise it. Fig. 14 shows a modification wherein the air outlet through apertures in a plate 12 is regulated by adjusting a sliding plate 21. In the modification shown in Fig. 17, apertures 6 in the air-pipe 1 are covered or uncovered as desired, by rotating over them a half-cylinder 23 connected by rods 24 to a sleeve movable by a hand-wheel 26. Fig. 18 shows a modification wherein the tube 1 is rotated so as to present fewer or more of the holes 6 to the fuel-and-air pipe 2. In the modification, Fig. 21, the pipe 2 is rotated so that its lower end 51 uncovers more or fewer of the apertures 6, and the air and fuel pass through the aperture 52 into the pipe 2. In the modification shown in Fig. 23, the regulation is effected by rotating the chamfered end of the pipe 2 over the air nozzle, which has apertures 6 and a central discharge 53. Fig. 25 shows a modification wherein the air-pipe 1 is arranged in an enlargement 9 of the end of the pipe 2 and parallel to it, and is adjusted vertically so as to cover more or less of the slot 57. In the modification shown, Fig. 27, the air pressure raises the perforated head out of the pipe 1, the spring 62 tending to withdraw it. Fig. 28 shows a mechanism wherein the hand-wheel 66 opens or closes the air valve 65, and also, by means of the levers &c. 13, 17, adjusts a movable end piece 61 on the piece 2, and causes more or less of the air openings to be covered by the fuel. This mechanism is also shown adapted to control the piston valve 18 of a modification resembling that shown in Fig. 13. The Specification as open to inspection under Sect. 91 (3) (a) comprises also a modification in which a piston carrying the air-discharge nozzle is raised by a spring until the discharge apertures are wholly within the free space beneath the pipe 2. Upon turning on the air supply, the piston and nozzle are depressed and air flows through the coal dust and carries it into the pipe 2. This subject-matter does not appear in the Specification as accepted.