CPC Definition - Subclass F23J

Last Updated Version: 2020.02
REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES  (combustion apparatus for consuming smoke or fumes, e.g. exhaust gases, F23G 7/06)
Definition statement

This place 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
Limiting references

This place does not cover:

Combustion apparatus for burning smoke or fumes, e.g. exhaust gases

F23G 7/06

Informative references

Attention is drawn to the following places, which may be of interest for search:

Separating dispersed particles from gases in general

B01D

Separating particles or dust from gases

B01D 46/00

Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases

B01D 53/00

Cleaning pipes in general

B08B 9/02

Removing fumes other than combustion fumes from the area where they are produced, in general

B08B 15/00

Composition of fuels

C10

Protection against fire for buildings

E04B 1/94

Chimneys as part of a building

E04F 17/02

Industrial chimney-stacks, i.e. free-standing chimneys

E04H 12/28

Removal or treatment of exhaust gas from internal combustion engines

F01N

Removing cooking fumes from domestic stoves or ranges

F24C 15/20

Fume conduits of furnaces, kilns, ovens, or retorts

F27D 17/002

Cleaning of surfaces of boiler, heat exchangers or heat transfer conduit contaminated by other than combustion products or residues

F28G

Special rules of classification

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 place, 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 following words/expressions are often used with the meaning indicated:

"boiler"

"combustion apparatus".

"burner"

"combustion apparatus".

Removing ash, clinker, or slag from combustion chambers ({removing flyash from flue gas F23J 15/022;} devices for removal of material from the bed of fluidised bed combustion apparatus F23C 10/24)
References
Limiting references

This place does not cover:

Removing solid particulate material, e.g. fly ash, from flue gases

F23J 15/022

Devices for removal of material from the bed of fluidised bed combustion apparatus

F23C 10/24

Informative references

Attention is drawn to the following places, which may be of interest for search:

Arrangements for collecting bottom ash and fly ash

F23J 3/06

Cleaning devices which form part of the combustion grate

F23H 15/00

Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Soot blowers per se

F28G 1/16

Cleaning furnace tubes; Cleaning flues or chimneys
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Cleaning pipes or tubes in general

B08B

Arrangement of devices for supplying chemicals to fire
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Arrangement of devices for treating smoke or fumes for supplying chemicals to fumes

F23J 15/003

Use of additives for fuels or fires

C10L 9/00, C10L 10/00

Devices for conducting smoke or fumes, e.g. flues  (chimney stacks 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
Limiting references

This place does not cover:

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

Informative references

Attention is drawn to the following places, which may be of interest for search:

Removing fumes other than combustion fumes from the area where they are produced, in general

B08B 15/00

Protecting buildings against heat

E04B 1/74

Protecting buildings against fire

E04B 1/94

Insulation for protection against fire

E04B 1/94

Heat insulation in general

F16L 59/00

Fittings for chimneys or flues  (side-supporting means for chimney stacks E04H 12/20; ladders permanently attached to chimneys E06C 9/00; draught-inducing apparatus associated with chimneys or flues F23L 17/00; tops for chimneys, terminals for flues F23L 17/02)
References
Limiting references

This place does not cover:

Side-supporting means for chimney stacks

E04H 12/20

Ladders permanently attached to chimneys

E06C 9/00

Draught-inducing apparatus associated with chimneys or flues

F23L 17/00

Tops for chimneys, terminals for flues

F23L 17/02

{composed of concentric elements, e.g. double walled (terminals for balanced flue arrangements F23L 17/04)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Pipes in general

F16L

Joints; Connections
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Pipe joints in general

F16L

Doors or covers specially adapted for smoke-boxes, flues, or chimneys
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Doors or covers in general

E06B

Arrangements of devices for treating smoke or fumes
Relationships with other classification places

Devices or methods per se for treating smoke or fumes are classified in the relevant places for the treatment. For example, chemical or biological purification of waste gases per se is classified in group B01D 53/00.

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Traps for solid deposits

F23J 3/04

Supplying chemicals to fire

F23J 7/00

Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases

B01D 53/00

{for supplying chemicals to fumes, e.g. using injection devices}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Arrangement of devices for supplying chemicals to fire

F23J 7/00

using washing fluids {(scrubbers for removing solids only F23J 15/022)}
References
Limiting references

This place does not cover:

Scrubbers for removing solids only

F23J 15/022