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REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; [N: (from fluidised-bed combustion apparatus F23C11/02T5)]; FLUES (precipitating dust from flue gases B01D; composition of fuel C10; combustion apparatus for consuming smoke or fumes, e.g. exhaust gases, F23G 7/06 )
Definition statement
This subclass/group covers:
  • All details of devices for removing or treating products or fumes originating from a combustion apparatus, including all relevant accessories and peripheral devices such as for example exhaust gas pipes, cooling arrangements, ash removal systems, arrangements for supplying chemicals to fumes, independently from the type of solid fuel which is burned;
  • Arrangements for supplying chemicals to fires;
  • Cleaning of surface tubes, flame tubes or surfaces which are contaminated by combustion products or residues.
References relevant to classification in this subclass
This subclass/group does not cover:
Removal or treatment of exhaust gas from internal combustion engines
Removal of materials from fluidised beds
Combustion apparatus for burning smoke or fumes, e.g. exhaust gases
Removing cooking fumes from domestic stoves or ranges
Cleaning of surfaces of boiler, heat exchangers or heat transfer conduit contaminated by other than combustion products or residues
From fluidised-bed combustion apparatus
F23C11/02T5
Precipitating dust from flue gases
Informative references
Attention is drawn to the following places, which may be of interest for search:
Separating particles or dust from gases
Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases
Removing fumes other than combustion fumes from the area where they are produced, in general
Cleaning pipes in general
Composition of fuels
Protection against fire for buildings
Chimneys as part of a building
Industrial chimney-stacks, i.e. free-standing chimneys
Fume conduits of furnaces, kilns, ovens, or retorts
Special rules of classification within this subclass

When classifying in this subclass, add codes F23J 2211/00-F23J 2219/80 and F23J 2900/01001-F23J 2900/15081.

Codes F23J 2700/001-F23J 2700/003 are not used.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Air
a mixture of gases containing free oxygen and able to promote or support combustion
Primary air
air supplied to the burning 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 term "secondary air" covers "tertiary air" etc.
Ash
means any solid combustion residues, for example remaining in the fuel bed or suspended in the flue gases
Burner
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
Combustion
means the direct combination of oxygen gas, e.g. in air, and a burnable substance
Combustion chamber
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 the apparatus where the reaction takes place between air and fuel
Flue gases
any gaseous products of combustion
Grate
a perforated surface, e.g. a grid, which supports or delimits a bed of burning fuel and serves to supply primary air
Synonyms and Keywords

In patent documents the expression/word "boiler" is often used with the meaning "combustion apparatus".

In patent documents the expression/word "burner" is often used with the meaning "combustion apparatus".

Removing ash, clinker, or slag from combustion chamber [N: arrangements for collecting bottom ash and flyash F23J 3/06; removing flyash from fluegas F23J 15/022 ]
References relevant to classification in this group
This subclass/group does not cover:
Arrangements for collecting bottom ash and fly ash
Removing solid particulate material, e.g. fly ash, from flue gases
Cleaning devices which form part of the combustion grate
Removing solid deposited residues from passages or chambers beyond the fire, e.g. from flues by soot blowers [N: (soot blowers per se F28G 1/16 )]
References relevant to classification in this group
This subclass/group does not cover:
Soot blowers per se
Arrangement of devices for supplying chemicals to fire (supplying chemicals to fire C10L; [N: to fumes F23J 15/003 ])
References relevant to classification in this group
This subclass/group does not cover:
Use of additives to fuels or fires for particular purposes
Arrangement of devices for treating smoke or fumes for supplying chemicals to fumes
Preventing premature solidification of molten combustion residues
Devices for conducting smoke or fumes, e.g. flues ([N: removing fumes other than combustion fumes from the area where they are produced, in general B08B 15/00]; heat insulation therefor E04B 1/94; chimneys E04H 12/28; removing cooking fumes from domestic stoves or ranges F24C 15/20; [N: fume conduits of furnaces, kilns, ovens, or retorts F27D 17/002 ])
References relevant to classification in this group
This subclass/group does not cover:
Removing fumes other than combustion fumes from the area where they are produced, in general
Heat insulation therefor
Chimneys
Removing cooking fumes from domestic stoves or ranges
Fume conduits of furnaces, kilns, ovens, or retorts
Fittings for chimneys or flues (staying, stiffening E04H; means for facilitating climbing E06C; draught-inducing apparatus associated with chimneys or flues F23L
References relevant to classification in this group
This subclass/group does not cover:
Draught-inducing apparatus associated with chimneys or flues
Staying, stiffening
means for facilitating climbing
Draught-inducing apparatus associated with chimneys or flues
Informative references
Attention is drawn to the following places, which may be of interest for search:
Staying, stiffening
Means for facilitating climbing
Arrangement of devices for treating smoke or fumes (treating smoke or fumes, see the relevant class for the treatment, e.g. B01D 53/00 )
References relevant to classification in this group
This subclass/group does not cover:
Traps for solid deposits
Supplying chemicals to fire
Reating smoke or fumes, see the relevant class for the treatment, e.g.
Informative references
Attention is drawn to the following places, which may be of interest for search:
Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases
using washing fluids [N: scrubbers for removing solids only F23J 15/022 ]
References relevant to classification in this group
This subclass/group does not cover:
Scrubbers for removing solids only
Subject matter not provided for in other groups of this subclass
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Last Modified: 10/11/2013