METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN AIR (burners F23D)

Introduced: September 1968

Description

This subclass covers combustion systems and methods employing liquid fuels or finely divided solid fuels (such as coal dust or pulverized fuel) dispersed and burned in air streams. It encompasses burner designs, fuel injection systems, and combustion chamber configurations optimized for suspension-type combustion, particularly relevant to oil-fired boilers, pulverized coal furnaces, and similar industrial heating applications. The classification excludes gas combustion (covered under F23D) and combustion of solid fuels in fixed or moving beds (covered under F23B), focusing instead on systems where fuel particles or droplets remain airborne during the combustion process.

Title

Titles differ between systems:

IPC: METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN AIR

CPC: METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN AIR (burners F23D)

Full Title

Full titles differ between systems:

IPC:

METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN AIR

CPC:

METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN AIR (burners F23D)

Of 19 combined children, 10 exist in both systems.

8 codes are CPC-only extensions, 1 exist only in IPC.

Note: 8 CPC extensions are marked as secondary classification only.

7 shared codes have differing titles between IPC and CPC.

Child Classifications

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F23C 1/00 Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being either a fluid fuel or a solid fuel suspended in air (combustion apparatus characterized by the combination of two or more combustion chambers F23C6/00; pilot flame igniters F23Q9/00) IPC+CPC Available in IPC and CPC
F23C 10/00 Fluidised bed combustion apparatus since 2000 +3 CPC IPC+CPC Available in IPC and CPC
F23C 101/00 Combustion in entrained fluidised beds, i.e. fluidised beds which have no distinct upper surface since 2000 IPC only IPC only
F23C 13/00 Apparatus in which combustion takes place in the presence of catalytic material (in a fluidised bed of catalytic particles F23C10/01; radiant gas burners using catalysis for flameless combustion F23D14/18) since 2006 IPC+CPC Available in IPC and CPC
F23C 15/00 Apparatus in which combustion takes place in pulses influenced by acoustic resonance in a gas mass since 2006 IPC+CPC Available in IPC and CPC
F23C 2200/00 Combustion techniques for fluent fuel 2nd only CPC only CPC only
F23C 2201/00 Staged combustion 2nd only +4 CPC CPC only CPC only
F23C 2202/00 Fluegas recirculation 2nd only +5 CPC CPC only CPC only
F23C 2203/00 Flame cooling methods otherwise than by staging or recirculation 2nd only +3 CPC CPC only CPC only
F23C 2205/00 Pulsating combustion 2nd only +2 CPC CPC only CPC only
F23C 2206/00 Fluidised bed combustion 2nd only +1 CPC CPC only CPC only
F23C 2700/00 Special arrangements for combustion apparatus using fluent fuel 2nd only +3 CPC CPC only CPC only
F23C 2900/00 Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor 2nd only +40 CPC CPC only CPC only
F23C 3/00 Combustion apparatus characterised by the shape of the combustion chamber +3 CPC IPC+CPC Available in IPC and CPC
F23C 5/00 Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus (F23C1/00, F23C15/00 take precedence) IPC+CPC Available in IPC and CPC
F23C 6/00 Combustion apparatus characterised by the combination of two or more combustion chambers since 1980 IPC+CPC Available in IPC and CPC
F23C 7/00 Combustion apparatus characterised by arrangements for air supply (inlets for fluidisation air F23C10/20; baffles or shields with air supply passages F23M9/04) +2 CPC IPC+CPC Available in IPC and CPC
F23C 9/00 Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber (fluidised bed combustion apparatus with means for recirculation of particles entrained from the bed F23C10/02; fluidised bed combustion apparatus with devices for removal and partial reintroduction of material from the bed F23C10/26) +2 CPC IPC+CPC Available in IPC and CPC
F23C 99/00 Subject-matter not provided for in other groups of this subclass since 2006 +5 CPC IPC+CPC Available in IPC and CPC