F23C 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:
METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN AIR
METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN AIR (burners F23D)
Additional Content IPC
Glossary
air a mixture of gases containing free oxygen and able to promote or support combustion primary air air supplied to the burning fuel (e.g. together with the fuel) in order to liberate combustible gases secondary air air supplied to the combustible gases liberated by the primary air in order to complete their combustion. The expression "secondary air" covers "tertiary air" etc. Burner burners a device by which fluid fuel or solid fuel suspended in air is passed to a combustion space where it burns to produce a self-supporting flame. A burner includes the means for feeding air that are arranged in immediate connection with a fuel feeding conduit, for example concentric with it. Combustion a heat-producing sequence of chemical reactions between a burnable substance and molecular oxygen, e.g. in air, in most cases generating light in the form of flames or a glow combustion chamber combustion chambers a chamber in which fuel is burned to establish a self-supporting fire or flame and which surrounds that fire or flame combustion zone the part of an apparatus where the reaction takes place between air and fuel
Limiting references
Burners Candles
Application references
Baking ovens Cooking apparatus Gas turbine plants Lighting Generating steam Combustion specially adapted for waste or low grade fuel Generating combustion products of high temperature or high pressure Domestic stoves or ranges for cooking or local heating Domestic heating systems or space-heating systems Heating of fluids, e.g. air or water Drying Heat treatment of material or articles
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 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 2203/00 Flame cooling methods otherwise than by staging or recirculation 2nd only +3 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
Top Applicants
Top Applicants (IPC)
Class F23,2013–2023, worldwide · Source: EPO PATSTAT
- GE (GENERAL ELECTRIC COMPANY) US 2,124
- XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 1,369
- NINGBO FOTILE KITCHENWARE COMPANY 1,363
- SIEMENS DE 997
- UNITED TECHNOLOGIES CORPORATION (UTC) US 937
- GE (GENERAL ELECTRIC COMPANY) 898
- VATTI 815
- CHINESE ACADEMY OF SCIENCES 719
- RINNAI COMPANY 708
- MITSUBISHI HITACHI POWER SYSTEMS 670
Top Applicants (CPC)
Class F23,2013–2023, worldwide · Source: EPO PATSTAT
- GE (GENERAL ELECTRIC COMPANY) US 2,581
- UNITED TECHNOLOGIES CORPORATION (UTC) US 1,180
- SIEMENS DE 1,157
- GE (GENERAL ELECTRIC COMPANY) 994
- XIAN THERMAL POWER RESEARCH INSTITUTE COMPANY 769
- MITSUBISHI HEAVY INDUSTRIES JP 701
- MITSUBISHI HITACHI POWER SYSTEMS JP 695
- RAYTHEON TECHNOLOGIES CORPORATION US 587
- NINGBO FOTILE KITCHENWARE COMPANY 543
- GENERAL ELECTRIC TECHNOLOGY CH 490