| 1/00 | Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus (filtration B01D; mixing B01F; pulverising B02C; drying F26B) |
| 1/02 | Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus (filtration B01D; mixing B01F; pulverising B02C; drying F26B) Mixing solid fuel with a liquid, e.g. preparing slurries |
| 1/04 | Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus (filtration B01D; mixing B01F; pulverising B02C; drying F26B) Heating fuel prior to delivery to combustion apparatus |
| 3/00 | Feeding or distributing of lump or pulverulent fuel to combustion apparatus (conveying in general B65G) |
| 3/02 | Feeding or distributing of lump or pulverulent fuel to combustion apparatus (conveying in general B65G) Pneumatic feeding arrangements, i.e. by air blast |
| 3/04 | Feeding or distributing of lump or pulverulent fuel to combustion apparatus (conveying in general B65G) for locomotive boiler furnaces |
| 3/06 | Feeding or distributing of lump or pulverulent fuel to combustion apparatus (conveying in general B65G) for shaft-type furnaces |
| 3/08 | Feeding or distributing of lump or pulverulent fuel to combustion apparatus (conveying in general B65G) for furnaces having movable grate bars |
| 3/10 | Feeding or distributing of lump or pulverulent fuel to combustion apparatus (conveying in general B65G) Under-feed arrangements |
| 3/12 | Feeding or distributing of lump or pulverulent fuel to combustion apparatus (conveying in general B65G) Under-feed arrangements feeding by piston |
| 3/14 | Feeding or distributing of lump or pulverulent fuel to combustion apparatus (conveying in general B65G) Under-feed arrangements feeding by screw |
| 3/16 | Feeding or distributing of lump or pulverulent fuel to combustion apparatus (conveying in general B65G) Over-feed arrangements |
| 3/18 | Feeding or distributing of lump or pulverulent fuel to combustion apparatus (conveying in general B65G) Over-feed arrangements Spreader stokers |
| 3/20 | Feeding or distributing of lump or pulverulent fuel to combustion apparatus (conveying in general B65G) Over-feed arrangements Spreader stokers with moving hoppers |
| 3/22 | Feeding or distributing of lump or pulverulent fuel to combustion apparatus (conveying in general B65G) Controlling thickness of fuel bed |
| 5/00 | Feeding or distributing other fuel to combustion apparatus |
| 5/02 | Feeding or distributing other fuel to combustion apparatus Liquid fuel |
| 5/04 | Feeding or distributing other fuel to combustion apparatus Liquid fuel Feeding or distributing systems using pumps (F23K 5/06 takes precedence) |
| 5/06 | Feeding or distributing other fuel to combustion apparatus Liquid fuel from a central source to a plurality of burners |
| 5/08 | Feeding or distributing other fuel to combustion apparatus Liquid fuel Preparation of fuel |