Skip over navigation
Printable version [PDF]
REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES {(from fluidised-bed combustion apparatus F23C 10/24)}; 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 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 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

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

C10

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, 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 {(arrangements for collecting bottom ash and flyash F23J 3/06; removing flyash from flue gas F23J 15/022)}
References relevant to classification in this group
This 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 {(soot blowers per se F28G 1/16)}
References relevant to classification in this group
This group does not cover:

Soot blowers per se

Arrangement of devices for supplying chemicals to fire (supplying chemicals to fire C10L; {to fumes F23J 15/003})
References relevant to classification in this group
This 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

Devices for conducting smoke or fumes, e.g. flues ({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; { fume conduits of furnaces, kilns, ovens, or retorts F27D 17/002})
References relevant to classification in this group
This 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 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 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 {(scrubbers for removing solids only F23J 15/022)}
References relevant to classification in this group
This subgroup does not cover:

Scrubbers for removing solids only

This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013