F23D BURNERS
Introduced: September 1968
Description
F23D covers the design and construction of burners used in combustion apparatus for heating, power generation, and other thermal applications. This subclass includes gas burners, oil burners, pulverized fuel burners, and combination fuel burners, along with their structural components such as fuel injection systems, air supply mechanisms, and flame stabilization devices. The classification encompasses burner types ranging from domestic appliances to industrial furnaces and boilers, but excludes the overall combustion apparatus design (covered by F23B) and specific combustion process control methods (covered by F23N).
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 space the zone downstream of the fuel (and, where applicable, air) outlet where the reaction takes place between air and fuel. Pilot flame a small flame that is lit or kept alight in order to provide ignition to a more powerful burner. Retention flame a small flame that is kept alight in order to maintain the uninterrupted operation of a more powerful burner. Torch Torches a burner fired with fuel gas and oxygen and specially adapted to apply heat to a workpiece, for example for use in welding, cutting or brazing.
Limiting references
Candles Combustion in a fluidised bed of fuel or other particles Apparatus in which combustion takes place in pulses influenced by acoustic resonance in a gas mass Igniting of burners
Application references
Flame throwers for destroying noxious animals or plants Bakers' ovens Cooking devices, e.g. travelling cookers or barbecues , Soldering , Gas flame welding or cutting Cutting, scarfing, or desurfacing by applying flames Using burners in chemical vapour deposition Heating boreholes or wells with burners Using burners for regenerating exhaust gas filters Gas-turbine plants Jet-propulsion plants Using burners for ignition of internal combustion engines , Incandescent mantles Non-electric portable lighting devices Non-electric non-portable lighting devices Arrangements of mantles or other incandescent bodies on lighting burners Details of lighting devices employing combustion as light source Steam boilers Arrangement of burners in combustion apparatus Methods or apparatus specially adapted for combustion of waste or low-grade fuels. e.g. waste oil, waste liquors or waste gases Lighters containing fuel Ignition using burners , Generating combustion products of high pressure or high velocity, e.g. gas turbine burners Stoves or ranges for liquid or gaseous fuels Fluid heaters having heat-generating means, e.g. heating boilers Arrangement of burners in fluid heaters Arrangement of burners in furnaces or ovens for heat treatment Using burners for cleaning heat exchangers Flame-throwers for attack or defence
CPC subdivides this area 3x more granularly than IPC with 16 additional codes.
16 codes are CPC-only extensions.
Note: 16 CPC extensions are marked as secondary classification only.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- F23D 11/00 Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space +3 CPC IPC+CPC Available in IPC and CPC
- F23D 14/00 Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid since 1985 IPC+CPC Available in IPC and CPC
- F23D 17/00 Burners for combustion simultaneously or alternately of gaseous or liquid or pulverulent fuel +3 CPC IPC+CPC Available in IPC and CPC
- F23D 2201/00 Burners adapted for particulate solid or pulverulent fuels 2nd only +3 CPC CPC only CPC only
- F23D 2204/00 Burners adapted for simultaneous or alternative combustion having more than one fuel supply 2nd only +3 CPC CPC only CPC only
- F23D 2205/00 Assemblies of two or more burners, irrespective of fuel type 2nd only CPC only CPC only
- F23D 23/00 Assemblies of two or more burners (gas burners with provision for a retention flame F23D14/26) 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