METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL (for combustion of fuels that are solid at room temperatures, but burned in melted form, e.g. candle wax, C11C5/00, F23C, F23D; using solid fuel suspended in air F23C, F23D1/00; using solid fuel suspended in liquids F23C, F23D11/00; using solid fuel and fluent fuel simultaneously or alternately F23C, F23D17/00; burning of low grade fuel F23G; grates F23H; feeding solid fuel to combustion apparatus F23K; combustion chambers, not otherwise provided for F23M; domestic apparatus F24; central heating boilers F24D; package boilers F24H)

Introduced: September 1968

Description

F23B covers combustion systems and methods designed exclusively for solid fuels such as coal, coke, wood, biomass, and other carbonaceous materials. This subclass encompasses furnace design, combustion chambers, grate systems, ash handling mechanisms, and control equipment necessary for efficient solid fuel burning. Technologies include stoker-fired boilers, hand-fired hearths, fluidized bed combustors, and related accessories for regulating air supply and fuel feed. Processes for optimizing combustion conditions, heat transfer, and emission control in solid fuel applications also fall within this classification scope.

Title

Titles differ between systems:

IPC: METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL

CPC: METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL (for combustion of fuels that are solid at room temperatures, but burned in melted form, e.g. candle wax, C11C5/00, F23C, F23D; using solid fuel suspended in air F23C, F23D1/00; using solid fuel suspended in liquids F23C, F23D11/00; using solid fuel and fluent fuel simultaneously or alternately F23C, F23D17/00; burning of low grade fuel F23G; grates F23H; feeding solid fuel to combustion apparatus F23K; combustion chambers, not otherwise provided for F23M; domestic apparatus F24; central heating boilers F24D; package boilers F24H)

Full Title

Full titles differ between systems:

IPC:

METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL

CPC:

METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL (for combustion of fuels that are solid at room temperatures, but burned in melted form, e.g. candle wax, C11C5/00, F23C, F23D; using solid fuel suspended in air F23C, F23D1/00; using solid fuel suspended in liquids F23C, F23D11/00; using solid fuel and fluent fuel simultaneously or alternately F23C, F23D17/00; burning of low grade fuel F23G; grates F23H; feeding solid fuel to combustion apparatus F23K; combustion chambers, not otherwise provided for F23M; domestic apparatus F24; central heating boilers F24D; package boilers F24H)

Of 20 combined children, 10 exist in both systems.

8 codes are CPC-only extensions, 2 exist only in IPC.

Note: 4 CPC extensions are marked as secondary classification only.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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F23B 1/00 +3 CPC CPC only CPC only
F23B 10/00 Combustion apparatus characterised by the combination of two or more combustion chambers since 2006 IPC+CPC Available in IPC and CPC
F23B 101/00 Adaptation of combustion apparatus to boilers in which the combustion chamber is situated inside the boiler vessel, e.g. surrounded by cooled surfaces since 2006 IPC only IPC only
F23B 103/00 Adaptation of combustion apparatus for placement in or against an opening of a boiler, e.g. for replacing an oil burner since 2006 −1 IPC IPC only IPC only
F23B 20/00 Combustion apparatus specially adapted for portability or transportability since 2006 IPC+CPC Available in IPC and CPC
F23B 2101/00 Adaptation of combustion apparatus to boilers in which the combustion chamber is situated inside the boiler vessel, e.g. surrounded by cooled surfaces 2nd only CPC only CPC only
F23B 2103/00 Adaptation of combustion apparatus for placement in or against an opening of a boiler, e.g. for replacing an oil burner 2nd only +1 CPC CPC only CPC only
F23B 2700/00 Combustion apparatus for solid fuel 2nd only +16 CPC CPC only CPC only
F23B 2900/00 Special features of, or arrangements for combustion apparatus using solid fuels; Combustion processes therefor 2nd only +6 CPC CPC only CPC only
F23B 3/00 CPC only CPC only
F23B 30/00 Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber since 2006 IPC+CPC Available in IPC and CPC
F23B 40/00 Combustion apparatus with driven means for feeding fuel into the combustion chamber since 2006 IPC+CPC Available in IPC and CPC
F23B 5/00 +2 CPC CPC only CPC only
F23B 50/00 Combustion apparatus in which the fuel is fed into or through the combustion zone by gravity, e.g. from a fuel storage situated above the combustion zone since 2006 IPC+CPC Available in IPC and CPC
F23B 60/00 Combustion apparatus in which the fuel burns essentially without moving since 2006 IPC+CPC Available in IPC and CPC
F23B 7/00 +1 CPC CPC only CPC only
F23B 70/00 Combustion apparatus characterised by means returning solid combustion residues to the combustion chamber since 2006 IPC+CPC Available in IPC and CPC
F23B 80/00 Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel since 2006 IPC+CPC Available in IPC and CPC
F23B 90/00 Combustion methods not related to a particular type of apparatus since 2006 IPC+CPC Available in IPC and CPC
F23B 99/00 Subject matter not provided for in other groups of this subclass since 2006 IPC+CPC Available in IPC and CPC