1. CPC Sections
  2. CPC Section F
  3. CPC Class F23
  4. CPC Subclass F23B
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CPC
COOPERATIVE PATENT CLASSIFICATION
​​
F23B
METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL (for combustion of fuels that are solid at room temperatures, but burned in melted form, e.g. candle wax, C11C 5/00, F23C, F23D; using solid fuel suspended in air F23C, F23D 1/00; using solid fuel suspended in liquids F23C, F23D 11/00; using solid fuel and fluent fuel simultaneously or alternately F23C, F23D 17/00; burning of low grade fuel F23G; grates F23H; feeding solid fuel to combustion apparatus F23K; combustion chambers, not otherwise provided for F23M; domestic apparatus F24; central heating boilers F24D; package boilers F24H) [2020-05]
NOTES

  • This subclass only covers combustion wherein the main body of fuel is either essentially stationary during combustion or mechanically transported, as opposed to pneumatically transported or suspended in air, during combustion.
  • In this subclass, the first place priority rule is applied, i.e. at each hierarchical level, in the absence of an indication to the contrary, classification is made in the first appropriate place.
  • In this subclass, methods are classified in the groups that cover the apparatus used. Methods that are not related to a particular type of apparatus are classified in group F23B 90/00.
  • In this subclass, it is desirable to add the indexing codes of groups F23B 2101/00 - F23B 2900/00.
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.
F23B 1/00
{Combustion apparatus using only lump fuel} [2016-11]
F23B 1/02
.
{for indirect heating of a medium in a vessel, e.g. for boiling water (steam generation F22)} [2016-11]
F23B 1/04
. .
{External furnaces, i.e. with furnace in front of the vessel} [2016-11]
F23B 1/06
. . .
{for heating water-tube boilers, e.g. Tenbrink flue furnaces} [2016-11]
F23B 1/08
. .
{Internal furnaces, i.e. with furnaces inside the vessel} [2016-11]
F23B 1/10
. . .
{for heating locomotive boilers} [2016-11]
F23B 1/12
. .
{with a plurality of combustion chambers} [2016-11]
F23B 1/16
.
{the combustion apparatus being modified according to the form of grate or other fuel support (for incinerators F23G 5/002)} [2016-11]
F23B 1/165
. .
{using roller grate} [2013-01]
F23B 1/18
. .
{using inclined grate} [2016-11]
F23B 1/20
. .
{using step-type grate} [2016-11]
F23B 1/22
. .
{using travelling grate} [2016-11]
F23B 1/24
. .
{using rotating grate} [2016-11]
F23B 1/26
. .
{using imperforate fuel supports} [2016-11]
F23B 1/28
. .
{using ridge-type grate, e.g. for combustion of peat, sawdust, or pulverulent fuel (combustion of peat, sawdust F23G 7/10)} [2016-11]
F23B 1/30
.
{characterised by the form of combustion chamber} [2016-11]
F23B 1/32
. .
{rotating} [2016-11]
F23B 1/34
. .
{annular} [2016-11]
F23B 1/36
. .
{shaft-type} [2016-11]
F23B 1/38
. .
{for combustion of peat, sawdust, or pulverulent fuel on a grate or other fuel support (combustion of peat, sawdust F23G 7/10)} [2016-11]
F23B 3/00
{Combustion apparatus which is portable or removable with respect to the boiler or other apparatus which is heated} [2016-11]
F23B 5/00
{Combustion apparatus with arrangements for burning uncombusted material from primary combustion (combustion apparatus characterised by the combination of two or more combustion chambers F23C 6/00; the primary combustion being pulverulent fuel F23C 9/003)} [2016-11]
F23B 5/02
.
{in main combustion chamber} [2016-11]
F23B 5/025
. .
{recirculating uncombusted solids to combustion chamber} [2013-01]
F23B 5/04
.
{in separate combustion chamber; on separate grate} [2016-11]
F23B 7/00
{Combustion techniques; Other solid-fuel combustion apparatus} [2016-11]
F23B 7/002
.
{characterised by gas flow arrangements} [2013-01]
F23B 7/005
. .
{with downdraught through fuel bed and grate} [2013-01]
F23B 7/007
. .
{with fluegas recirculation to combustion chamber} [2013-01]
F23B 10/00
Combustion apparatus characterised by the combination of two or more combustion chambers [2013-01]
F23B 10/02
.
including separate secondary combustion chambers [2016-05]
F23B 20/00
Combustion apparatus specially adapted for portability or transportability [2013-01]
F23B 30/00
Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber [2013-01]
F23B 30/02
.
with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts [2013-01]
F23B 30/04
. .
with fuel-supporting surfaces that are rotatable around a horizontal or inclined axis and support the fuel on their inside, e.g. cylindrical grates [2013-01]
F23B 30/06
. .
with fuel supporting surfaces that are specially adapted for advancing fuel through the combustion zone [2017-08]
F23B 30/08
. . .
with fuel-supporting surfaces that move through the combustion zone, e.g. with chain grates [2013-01]
F23B 30/10
. . .
with fuel-supporting surfaces having fuel advancing elements that are movable, but remain essentially in the same place, e.g. with rollers or reciprocating grate bars [2013-01]
F23B 40/00
Combustion apparatus with driven means for feeding fuel into the combustion chamber [2013-01]
F23B 40/02
.
the fuel being fed by scattering over the fuel-supporting surface [2013-01]
F23B 40/04
.
the fuel being fed from below through an opening in the fuel-supporting surface [2013-01]
F23B 40/06
.
the fuel being fed along the fuel-supporting surface [2013-01]
F23B 40/08
. .
into pot- or trough-shaped grates [2017-08]
F23B 50/00
Combustion apparatus in which the fuel is fed into or through the combustion zone by gravity, e.g. from a fuel storage situated above the combustion zone [2013-01]
F23B 50/02
.
the fuel forming a column, stack or thick layer with the combustion zone at its bottom [2013-01]
F23B 50/04
. .
the movement of combustion air and flue gases being substantially transverse to the movement of the fuel [2013-01]
F23B 50/06
. .
the flue gases being removed downwards through one or more openings in the fuel-supporting surface [2017-08]
F23B 50/08
. .
with fuel-deflecting bodies forming free combustion spaces inside the fuel layer [2013-01]
F23B 50/10
. .
with the combustion zone at the bottom of fuel-filled conduits ending at the surface of a fuel bed [2013-01]
F23B 50/12
.
the fuel being fed to the combustion zone by free fall or by sliding along inclined surfaces, e.g. from a conveyor terminating above the fuel bed [2016-05]
F23B 60/00
Combustion apparatus in which the fuel burns essentially without moving [2013-01]
F23B 60/02
.
with combustion air supplied through a grate [2013-01]
F23B 70/00
Combustion apparatus characterised by means returning solid combustion residues to the combustion chamber [2013-01]
F23B 80/00
Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel [2013-01]
F23B 80/02
.
by means for returning flue gases to the combustion chamber or to the combustion zone [2013-01]
F23B 80/04
.
by means for guiding the flow of flue gases, e.g. baffles [2013-01]
​
F23B 90/00
Combustion methods not related to a particular type of apparatus [2016-05]
NOTE

F23B 90/02
.
Start-up techniques [2013-01]
F23B 90/04
.
including secondary combustion (in separate combustion chambers F23B 10/02) [2013-01]
F23B 90/06
. .
the primary combustion being a gasification or pyrolysis in a reductive atmosphere [2013-01]
F23B 90/08
. .
in the presence of catalytic material [2013-01]
F23B 99/00
Subject matter not provided for in other groups of this subclass [2013-01]
Indexing scheme related to adaptation of combustion apparatus to boilers [2019-05]
F23B 2101/00
Adaptation of combustion apparatus to boilers in which the combustion chamber is situated inside the boiler vessel, e.g. surrounded by cooled surfaces [2013-01]
F23B 2103/00
Adaptation of combustion apparatus for placement in or against an opening of a boiler, e.g. for replacing an oil burner [2013-01]
F23B 2103/02
.
for producing an essentially horizontal flame [2013-01]
F23B 2700/00
Combustion apparatus for solid fuel [2013-01]
F23B 2700/003
.
adapted for use in water-tube boilers [2013-01]
F23B 2700/004
.
adapted for use in Tenbrink boilers [2013-01]
F23B 2700/005
.
adapted for use in locomotives [2013-01]
F23B 2700/006
.
Details of locomotive combustion apparatus [2013-01]
F23B 2700/007
.
with pressurised combustion chambers [2013-01]
F23B 2700/008
.
with interchangeable combustion chambers [2013-01]
F23B 2700/009
.
adapted for use in various steam boilers [2013-01]
F23B 2700/01
.
adapted for boilers built up from sections [2013-01]
F23B 2700/011
.
with fuel shaft for steam boilers [2013-01]
F23B 2700/012
.
with predrying in fuel supply area [2018-01]
F23B 2700/013
.
for use in baking ovens or cooking vessels [2013-01]
F23B 2700/014
.
for use in reverberatory furnaces [2013-01]
F23B 2700/018
.
with fume afterburning by staged combustion [2013-01]
F23B 2700/022
.
with various types of fume afterburners [2013-01]
F23B 2700/023
.
with various arrangements not otherwise provided for [2013-01]
F23B 2700/037
.
Burners for solid or solidified fuel, e.g. metaldehyde blocks [2013-01]
F23B 2900/00
Special features of, or arrangements for combustion apparatus using solid fuels; Combustion processes therefor [2013-01]
F23B 2900/00001
.
Combustion chambers with integrated fuel hopper [2013-01]
F23B 2900/00003
.
Combustion devices specially adapted for burning metal fuels, e.g. Al or Mg [2013-01]
F23B 2900/00004
.
Means for generating pulsating combustion of solid fuel [2013-01]
F23B 2900/00005
.
Means for applying acoustical energy to flame [2013-01]
F23B 2900/00006
.
Means for applying electricity to flame, e.g. an electric field [2013-01]
F23B 2900/99001
.
Retrofitting or converting solid fuel stoves to gas or liquid fuels [2013-01]