| F | SK | MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
| F23 | KL | COMBUSTION APPARATUS; COMBUSTION PROCESSES |
| F23B | UKL | COMBUSTION APPARATUS USING ONLY SOLID FUEL (for lump and another kind of fuel simultaneously or alternatively F23C 1/00; fluidised bed combustion apparatus F23C 10/00; burning of low-grade fuel F23G; grates F23H; feeding solid fuel to combustion apparatus F23K; constructional details of combustion chambers not otherwise provided for F23M; domestic apparatus F24; central heating boilers F24D; package boilers F24H) |
| F23B 1/00 | HGR | Combustion apparatus using only lump fuel |
| F23B 1/02 | UGR1 | | . | for indirect heating of a medium in a vessel, e.g. for boiling water (steam generation F22) |
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| F23B 1/04 | UGR2 | | . . | External furnaces, i.e. with furnace in front of the vessel |
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| F23B 1/06 | UGR3 | | . . . | for heating water-tube boilers, e.g. Tenbrink flue furnaces |
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| F23B 1/08 | UGR2 | | . . | Internal furnaces, i.e. with furnaces inside the vessel |
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| F23B 1/10 | UGR3 | | . . . | for heating locomotive boilers |
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| F23B 1/12 | UGR2 | | . . | with a plurality of combustion chambers |
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| F23B 1/14 | UGR1 | | . | Combined gas-producer and boiler, e.g. returning gases to flame (destructive distillation C10B) |
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| F23B 1/16 | UGR1 | | . | the combustion apparatus being modified according to the form of grate or other fuel support |
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| F23B 1/18 | UGR2 | |
| F23B 1/20 | UGR2 | |
| F23B 1/22 | UGR2 | | . . | using travelling grate |
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| F23B 1/24 | UGR2 | |
| F23B 1/26 | UGR2 | | . . | using imperforate fuel supports |
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| F23B 1/28 | UGR2 | | . . | using ridge-type grate, e.g. for combustion of peat, sawdust, or pulverulent fuel |
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| F23B 1/30 | UGR1 | | . | characterised by the form of combustion chamber |
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| F23B 1/32 | UGR2 | |
| F23B 1/34 | UGR2 | |
| F23B 1/36 | UGR2 | |
| F23B 1/38 | UGR2 | | . . | for combustion of peat, sawdust, or pulverulent fuel on a grate or other fuel support |
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| F23B 3/00 | HGR | Combustion apparatus which is portable or removable with respect to the boiler or other apparatus which is heated |
| F23B 5/00 | HGR | Combustion apparatus with arrangements for burning uncombusted material from primary combustion (wherein the primary combustion may be of pulverulent fuel F23C 9/00) |
| F23B 5/02 | UGR1 | | . | in main combustion chamber |
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| F23B 5/04 | UGR1 | | . | in separate combustion chamber; on separate grate |
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| F23B 7/00 | HGR | Combustion techniques; Other solid-fuel combustion apparatus |