Patent GB-190922137-A (GB)
Title: Improvements in Refuse Destructors.
Inventor: LEASK HENRY NORMAN
IPC: F23J1/00
Filed: 1909-09-29
Granted: 1910-09-22
Abstract: 22,137. Leask, H. N. Sept. 29. [Cognate Application, 7548/10.] Grates; air supply, heating. - The grate of a refuse - destructor is formed of one or more perforated t r o u g h s, each trough being provided with a hollow metal jacket through which air circulates before passing through the perforations in the troughs to the fire, with hinged doors to allow any dust that may have collected in the jacket to fall into the ash-pit, and preferably with a bar extending the length of the grate for withdrawing clinker. Fig. 3 shows a simple form of grate, the sides A', A<2> and the back end of which are provided with ribs a<2> and an outer jacket B, through which air from the ash-pit passes downwards and thence through the holes a in the grate. Hinged doors b, operated by rods and levers from the front of the furnace, allow ashes from the jacket to drop into the ash-pit. The perforations a may be arranged in the upper part of longitudinal grooves formed in the sides A', A<2>, The grate may be supported by the side walls or by cross-girders M, or by both of these methods. To allow the grate to expand or contract freely under variations of temperature, it may be supported on rollers m<1>, Fig. 11, which are interposed between the grate and rollerways m supported on the girders M. When two or more troughs are arranged side by side, the tops of the sides of the troughs may be prevented from burning away by a coping or inverted arch of fire-brick, or a chamber E' through which water circulates. The edges of adjacent troughs may be built into a fire-brick wall, or bolted or otherwise secured together and supported upon a partition wall in the ash-pit. Fig. 18 shows the upper edges of the grate provided with a depending plate o secured between them and dipping into a water tank o<1>. The plate o may be supported by a wall. Instead of the plate o, one or both of the adjacent edges of two troughs may depend and be supported by, or dip into, a water tank. The walls of the trough may also be extended downwards and dip into a tank of water for cooling purposes, as shown in Fig. 7. If desired, the bottom of the trough may be very narrow and without air inlets. The lower portions of the side walls may be made vertical or inclined slightly outwards, and a further modification consists in making the back of the trough of fire-brick, which may form part of the furnace wall. In the modification shown in Fig. 11, the back of the trough is made of iron provided with ribs a<2>, against which air entering at f impinges and passes downwards through the passage f<1> and valve H to the ash-pit. The means for removing clinker and the like from the grate consists, in one form, of a bar D, Fig. 11, arranged in a recess in the bottom of the trough and capable of longitudinal movement upon rollers m<2>. A plate d or the like at the end of the bar engages with the clinker. Air passes into the furnace around the bar and serves to keep it cool. The plate d may be made detachable and attached only when it is required to draw the clinker, a door being provided at the back of the furnace for this purpose. Any ash or clinker that is pushed forward by the insertion of the bar D falls into a chamber closed by a door K at the rear of the grate. Where several troughs are arranged side by side, a single winch arranged at the front of the furnace serves to operate all the draw-bars. Instead of a draw-bar such as D, a ram or pusher arranged at the back of the furnace may be used to discharge the clinker. A suitable truck may be provided outside the furnace to receive clinker, the heat of which may be utilized to heat the air supplied to the furnace. The truck may be removed to a chamber through which the air supply is passed, or the truck itself may be so constructed that air can be blown through it and the clinker. Specification 25,017/06 is referred to.