1. CPC Sections
  2. CPC Section F
  3. CPC Class F23
  4. CPC Subclass F23J
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CPC
COOPERATIVE PATENT CLASSIFICATION
​​
F23J
REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES  (combustion apparatus for consuming smoke or fumes, e.g. exhaust gases, F23G 7/06) [2020-01]
NOTE

  • This subclass covers the cleaning of external surfaces of water tubes of boilers
WARNING

  • {In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.}
F23J 1/00
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) [2020-01]
F23J 1/02
.
Apparatus for removing ash, clinker, or slag from ash-pits, e.g. by employing trucks or conveyors, by employing suction devices [2016-05]
F23J 1/04
.
Hand tools, e.g. rakes, prickers, tongs [2013-01]
F23J 1/06
.
Mechanically-operated devices, e.g. clinker pushers (forming part of the grate F23H) [2013-01]
F23J 1/08
.
Liquid slag removal [2013-01]
F23J 3/00
Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers [2020-01]
F23J 3/02
.
Cleaning furnace tubes; Cleaning flues or chimneys [2020-01]
F23J 3/023
. .
{cleaning the fireside of watertubes in boilers} [2013-01]
F23J 3/026
. .
{cleaning the chimneys} [2013-01]
F23J 3/04
.
Traps [2013-01]
F23J 3/06
.
Systems for accumulating residues from different parts of furnace plant [2013-01]
F23J 7/00
Arrangement of devices for supplying chemicals to fire [2020-01]
F23J 9/00
Preventing premature solidification of molten combustion residues [2013-01]
F23J 11/00
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}) [2020-01]
F23J 11/02
.
for conducting smoke or fumes originating from various locations to the outside, e.g. in locomotive sheds, in garages [2013-01]
F23J 11/04
.
in locomotives; in road vehicles; in ships [2013-01]
F23J 11/06
. .
for conducting smoke horizontally [2013-01]
F23J 11/08
.
for portable apparatus [2013-01]
F23J 11/10
.
for tents; for log huts; for other inflammable structures [2013-01]
F23J 11/12
.
Smoke conduit systems for factories or large buildings [2013-01]
F23J 13/00
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) [2020-01]
F23J 13/02
.
Linings; Jackets; Casings [2013-01]
F23J 13/025
. .
{composed of concentric elements, e.g. double walled (terminals for balanced flue arrangements F23L 17/04)} [2020-01]
F23J 13/04
.
Joints; Connections [2020-01]
F23J 13/06
.
Mouths; Inlet holes [2013-01]
F23J 13/08
.
Doors or covers specially adapted for smoke-boxes, flues, or chimneys [2020-01]
F23J 15/00
Arrangements of devices for treating smoke or fumes [2020-01]
F23J 15/003
.
{for supplying chemicals to fumes, e.g. using injection devices} [2020-01]
F23J 15/006
.
{Layout of treatment plant} [2013-01]
F23J 15/02
.
of purifiers, e.g. for removing noxious material (traps for solid residues F23J 3/04) [2020-01]
F23J 15/022
. .
{for removing solid particulate material from the gasflow} [2013-01]
F23J 15/025
. . .
{using filters} [2013-01]
F23J 15/027
. . .
{using cyclone separators} [2013-01]
F23J 15/04
. .
using washing fluids {(scrubbers for removing solids only F23J 15/022)} [2013-01]
F23J 15/06
.
of coolers [2013-01]
F23J 15/08
.
of heaters [2013-01]
F23J 99/00
Subject matter not provided for in other groups of this subclass [2013-01]
F23J 2211/00
Flue gas duct systems [2013-01]
F23J 2211/10
.
Balanced flues (combining air supply and flue gas exhaust) [2013-01]
F23J 2211/101
. .
with coaxial duct arrangement [2013-01]
F23J 2211/20
.
Common flues for several combustion devices [2013-01]
F23J 2211/30
.
Chimney or flue associated with building ventilation system [2013-01]
F23J 2211/40
.
Chimney with internal flue pipe system [2013-01]
F23J 2213/00
Chimneys or flues [2013-01]
F23J 2213/10
.
Linings [2013-01]
F23J 2213/101
. .
Fastening means therefor [2013-01]
F23J 2213/20
.
Joints; Connections [2013-01]
F23J 2213/201
. .
between stack and branch pipes [2013-01]
F23J 2213/202
. .
between duct or stack sections [2013-01]
F23J 2213/203
. .
between stack/duct and combustion apparatus [2013-01]
F23J 2213/204
. .
Sealing arrangements [2013-01]
F23J 2213/30
.
Specific materials [2013-01]
F23J 2213/301
. .
flexible [2013-01]
F23J 2213/302
. .
plastic [2013-01]
F23J 2213/303
. .
metallic [2013-01]
F23J 2213/304
. .
ceramic [2013-01]
F23J 2213/305
. .
glass [2013-01]
F23J 2213/40
.
Heat insulation fittings [2013-01]
F23J 2213/50
.
Top cover [2013-01]
F23J 2213/60
.
Service arrangements [2013-01]
F23J 2213/70
.
Safety arrangements [2013-01]
F23J 2215/00
Preventing emissions [2024-08]
F23J 2215/10
.
Nitrogen; Compounds thereof [2013-01]
F23J 2215/101
. .
Nitrous oxide (N2O) [2013-01]
F23J 2215/20
.
Sulfur; Compounds thereof [2013-01]
F23J 2215/30
.
Halogen; Compounds thereof [2013-01]
F23J 2215/301
. .
Dioxins; Furans [2013-01]
F23J 2215/40
.
Carbon monoxide [2013-01]
F23J 2215/50
.
Carbon dioxide [2013-01]
F23J 2215/60
.
Heavy metals; Compounds thereof [2013-01]
F23J 2217/00
Intercepting solids [2013-01]
F23J 2217/10
.
by filters [2013-01]
F23J 2217/101
. .
Baghouse type [2013-01]
F23J 2217/102
. .
electrostatic [2013-01]
F23J 2217/103
. .
ultrafine [HEPA] [2013-01]
F23J 2217/104
. .
High temperature resistant (ceramic) type [2013-01]
F23J 2217/105
. .
Granular bed [2013-01]
F23J 2217/20
.
by baffles [2013-01]
F23J 2217/30
.
by screens [2013-01]
F23J 2217/40
.
by cyclones [2013-01]
F23J 2217/50
.
by cleaning fluids (washers or scrubbers) [2013-01]
F23J 2217/60
.
using settling/precipitation chambers [2013-01]
F23J 2219/00
Treatment devices [2013-01]
F23J 2219/10
.
Catalytic reduction devices [2013-01]
F23J 2219/20
.
Non-catalytic reduction devices [2013-01]
F23J 2219/201
. .
Reducing species generators, e.g. plasma, corona [2013-01]
F23J 2219/30
.
Sorption devices using carbon, e.g. coke [2017-01]
F23J 2219/40
.
Sorption with wet devices, e.g. scrubbers [2013-01]
F23J 2219/50
.
Sorption with semi-dry devices, e.g. with slurries [2013-01]
F23J 2219/60
.
Sorption with dry devices, e.g. beds [2013-01]
F23J 2219/70
.
Condensing contaminants with coolers [2013-01]
F23J 2219/80
.
Quenching [2013-01]
F23J 2700/00
Ash removal, handling and treatment means; Ash and slag handling in pulverulent fuel furnaces; Ash removal means for incinerators [2013-01]
F23J 2700/001
.
Ash removal, handling and treatment means [2013-01]
F23J 2700/002
.
Ash and slag handling in pulverulent fuel furnaces [2013-01]
F23J 2700/003
.
Ash removal means for incinerators [2013-01]
F23J 2900/00
Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes [2013-01]
F23J 2900/01001
.
Sorting and classifying ashes or fly-ashes from the combustion chamber before further treatment [2013-01]
F23J 2900/01002
.
Cooling of ashes from the combustion chamber by indirect heat exchangers [2024-08]
F23J 2900/01003
.
Ash crushing means associated with ash removal means [2013-01]
F23J 2900/01004
.
Separating water from ash [2013-01]
F23J 2900/01005
.
Mixing water to ash [2013-01]
F23J 2900/01006
.
Airlock sealing associated with ash removal means [2013-01]
F23J 2900/01007
.
Thermal treatments of ash, e.g. temper or shock-cooling for granulation [2013-01]
F23J 2900/01009
.
Controls related to ash or slag extraction [2013-01]
F23J 2900/01021
.
Removing ashes from the ash pit using reciprocating means, e.g. pushers [2013-01]
F23J 2900/11001
.
Conducting systems with a gas flow bypass from main flue to an auxiliary flue [2013-01]
F23J 2900/11002
.
Modelling systems adapted for designing arrangements for conducting or purifying combustion fumes, e.g. flues [2013-01]
F23J 2900/13001
.
Preventing or reducing corrosion in chimneys [2013-01]
F23J 2900/13002
.
Initial heating of the flue before starting combustion [2013-01]
F23J 2900/13003
.
Means for reducing the noise in smoke conducing ducts or systems [2013-01]
F23J 2900/13004
.
Water draining devices associated with flues [2013-01]
F23J 2900/13005
.
Protections for chimneys or flue tops against external factors, e.g. birds [2013-01]
F23J 2900/13006
.
Devices for heating the chimney top to avoid ice formation [2013-01]
F23J 2900/13021
.
Means for supporting the lining of conducting means, e.g. ducts or chimneys [2013-01]
F23J 2900/13022
.
Manufacturing processes for the lining of conducting means, e.g. by extrusion [2013-01]
F23J 2900/13023
.
Ducts with non-circular cross-section [2013-01]
F23J 2900/15001
.
Irradiating fumes with electron or light beams, e.g. UV, for oxidizing or dissociating SOx and NOx [2013-01]
F23J 2900/15002
.
Cleaning fumes by letting them to pass a molten metal bath [2013-01]
F23J 2900/15003
.
Supplying fumes with ozone [2013-01]
F23J 2900/15004
.
Preventing plume emission at chimney outlet [2013-01]
F23J 2900/15021
.
Preventing emission of hexavalent chromium at the chimney outlet [2013-01]
F23J 2900/15022
.
Electrochemical cell filters [2013-01]
F23J 2900/15023
.
Magnetic filters [2013-01]
F23J 2900/15024
.
Photocatalytic filters [2013-01]
F23J 2900/15025
.
Cyclone walls forming heat exchangers [2013-01]
F23J 2900/15026
.
Cyclone separators with horizontal axis [2013-01]
F23J 2900/15027
.
Preventing emission of CO2 at the chimney outlet by using sea weeds filters or absorbers [2013-01]
F23J 2900/15041
.
Means for absorbing SOx using seawater [2013-01]
F23J 2900/15061
.
Deep cooling or freezing of flue gas rich of CO2 to deliver CO2-free emissions, or to deliver liquid CO2 [2013-01]
F23J 2900/15081
.
Reheating of flue gases [2013-01]