Patent GB-191410567-A (GB)
Title: Improvements in and relating to Mechanically Stoked Furnaces.
Inventor: ROMANET EMILE
IPC: F23H9/02
Filed: 1914-04-29
Granted: 1915-04-29
Abstract: 10,567. Romanet, E., April 29. Furnace fire-places; grates; crowns and roofs; ash-pits; cooling.-In a mechanically-stoked farnace of the kind having a revolving grate provided with fixed or dumping sections, the grate is supported in a special manner and is driven by means located in a trench or pit situated away from the heat, dust, and moisture of the furnace. Means are provided for cutting and removing the clinker which adheres to the grate bars, and for cooling the bars and the masonry in the immediate vicinity of the grate. The furnace gases travel in the reverse direction to the grate, and the roof of the furnace increases in height from the clinker-discharging portion of the grate towards the exit flue. The ash-pit is divided by vertical partitions so that the active portion of the grate may be subjected to forced draught. Openings are, however, provided in the partitions to allow air to pass from the part of the ash-pit which is under full pressure to the parts beneath the ashdischarging and stoking portions of the grate. As shown in Figs. 1 and 2, the grate comprises an outer annular rim 12 connected by radial arms 9 to a central trunk 2 surrounding a central core 6 of brickwork. The arms 9 support transverse or longitudinal fixed bars; but when dumping grate sectors 10 are employed, the sectors are pivoted at 11 to the rim 12 and trunk 2, and are provided with rollers 15 which engage with a track 14. The track 14 is interrupted at the ashdischarging point of the furnace, as shown in Fig. 8, to allow the discharge of clinker &c. from the grate sections. The central trunk 2 is supported on ball or roller bearings and is driven by gearing arranged in the pit 22. The trunk is maintained in a vertical position by ball or roller races 5. Rotary cutters 27, Fig. 8, provided with arms 27<a> are arranged radially with respect to the grate and serve to cut the clinker previous to its being dumped by the grate sectors. When fixed bars are employed, the clinker is discharged by reciprocating rakes 28, shown in Fig. 6. These rakes comprise two side members to which scrapers b are attached, and are driven by a crank-disk c and connecting-rods d, e. One of the side members slides on a pivoted counterweighted cam f, which is actuated during the movement of the rake by tappets h engaging with a pin i on the arm of the cam-lever so as to lower the scrapers on the discharge stroke and raise then on the return stroke. Fig. 8 shows a metal brush 29 which serves to clean the dumping grate sections after each tilting movement. To prevent the clinker from adhering to the brickwork above the rim 12 of the grate, pipes 23 containing glycerine or other liquid having a high boiling- point are arranged as shown in Fig. 1. The liquid circulating through these pipes is cooled by any suitable means, such as a thermo-siphon apparatus. Water is sprayed on to the bars from devices 41 to prevent the adhesion of clinker. Between the ash-discharging point and the fuel hopper 26, the grate is clear of fuel, so that the state of the bars may be observed and any defective bars may be replaced. Openings are provided in the furnace to facilitate hand-stoking in the event of stoppage of the grate.