United States Patent and Trademark Office

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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

}

)

NOTE

This subclass is only concerned with the combustion of lump fuel, or of pulverulent or granulated fuel if no use is made of its fluent nature.

Guide Heading:

IPC7 groups

F23B 1/00

Combustion apparatus using only lump fuel

F23B 1/02

for indirect heating of a medium in a vessel, e.g. for boiling water (steam generationF22)

F23B 1/04

. .

External furnaces, i.e. with furnace in front of the vessel

F23B 1/06

. . .

for heating water-tube boilers, e.g. Tenbrink flue furnaces

F23B 1/08

. .

Internal furnaces, i.e. with furnaces inside the vessel

F23B 1/10

. . .

for heating locomotive boilers

F23B 1/12

. .

with a plurality of combustion chambers

F23B 1/16

the combustion apparatus being modified according to the form of grate or other fuel support

{

for incineratorsF23G 5/002

}

F23B 1/165

. .

{

using roller grate

}

F23B 1/18

. .

using inclined grate

F23B 1/20

. .

using step-type grate

F23B 1/22

. .

using travelling grate

F23B 1/24

. .

using rotating grate

F23B 1/26

. .

using imperforate fuel supports

F23B 1/28

. .

using ridge-type grate, e.g. for combustion of peat, sawdust, or pulverulent fuel

{

(combustion of peat, sawdust F23G 7/10)

}

F23B 1/30

characterised by the form of combustion chamber

F23B 1/32

. .

rotating

F23B 1/34

. .

annular

F23B 1/36

. .

shaft-type

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)

}

F23B 3/00

Combustion apparatus which is portable or removable with respect to the boiler or other apparatus which is heated

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)

}

F23B 5/02

in main combustion chamber

F23B 5/025

. .

{

recirculating uncombusted solids to combustion chamber

}

F23B 5/04

in separate combustion chamber ; on separate grate

F23B 7/00

Combustion techniques ; Other solid-fuel combustion apparatus

F23B 7/002

{

characterised by gas flow arrangements

}

F23B 7/005

. .

{

with downdraught through fuel bed and grate

}

F23B 7/007

. .

{

with fluegas recirculation to combustion chamber

}

F23B 10/00

Combustion apparatus characterised by the combination of two or more combustion chambers

F23B 10/02

including separate secondary combustion chambers

WARNING

Group F23B 10/02 is not complete pending a reorganisation. See also groups F23B 10/00

F23B 20/00

Combustion apparatus specially adapted for portability or transportability

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

F23B 30/02

with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts

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

F23B 30/06

. .

with fuel supporting surfaces that are specially adapted for advancing fuel throught the combustion zone

F23B 30/08

. . .

with fuel-supporting surfaces that move through the combustion zone, e.g. with chain grates

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

F23B 40/00

Combustion apparatus with driven means for feeding fuel into the combustion chamber

F23B 40/02

the fuel being fed by scattering over the fuel-supporting surface

F23B 40/04

the fuel being fed from below through an opening in the fuel-supporting surface

F23B 40/06

the fuel being fed along the fuel-supporting surface

F23B 40/08

. .

into pot- or through-shaped grates

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

F23B 50/02

the fuel forming a column, stack or thick layer with the combustion zone at its bottom

F23B 50/04

. .

the movement of combustion air and flue gases being substantially transverse to the movement of the fuel

F23B 50/06

. .

the fuel gases being removed downwards through one or more openings in the fuel-supporting surface

F23B 50/08

. .

with fuel-deflecting bodies forming free combustion spaces inside the fuel layer

F23B 50/10

. .

with the combustion zone at the bottom of fuel-filled conduits ending at the surface of a fuel bed

F23B 50/12

the fuel being fed to the combustion zone by free fall or by sliding along inclined surfaces, e.g. from a conveyer terminating above the fuel bed

F23B 60/00

Combustion apparatus in which the fuel burns essentially without moving

F23B 60/02

with combustion air supplied through a grate

F23B 70/00

Combustion apparatus characterised by means returning solid combustion residues to the combustion chamber

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

F23B 80/02

by means for returning flue gases to the combustion chamber or to the combustion zone

F23B 80/04

by means for guiding the flow of flue gases, e.g. baffles

F23B 90/00

Combustion methods not related to a particular type of apparatus

NOTE

Groups F23B 90/00 - F23B 90/08 correspond to IPC2012.01

WARNING

Groups F23B 90/00 to F23B 90/08 are not complete pending a reorganisation. See also groups F23B 1/00 to F23B 7/007

F23B 90/02

Start-up techniques

F23B 90/04

including secondary combustion (in separate combustion chambers F23B 10/02)

F23B 90/06

. .

the primary combustion being a gasification or pyrolysis in a reductive atmosphere

F23B 90/08

. .

in the presence of catalytic material

F23B 99/00

Subject matter not provided for in other groups of this subclass

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

Guide Heading:

Indexing scheme related to adaptation of combustion apparatus to boilers

F23B 2103/00

Adaptation of combustion apparatus for placement in or against an opening of a boiler, e.g. for replacing an oil burner

F23B 2103/02

for producing an essentially horizontal flame

F23B 2700/00

Combustion apparatus for solid fuel

F23B 2700/003

adapted for use in water-tube boilers

F23B 2700/004

adapted for use in Tenbrink boilers

F23B 2700/005

adapted for use in locomotives

F23B 2700/006

Details of locomotive combustion apparatus

F23B 2700/007

with pressurised combustion chambers

F23B 2700/008

with interchangeable combustion chambers

F23B 2700/009

adapted for use in various steam boilers

F23B 2700/01

adapted for boilers built up from sections

F23B 2700/011

with fuel shaft for steam boilers

F23B 2700/012

with predrying in fuel suply area

F23B 2700/013

for use in baking ovens or cooking vessels

F23B 2700/014

for use in reverberatory furnaces

F23B 2700/018

with fume afterburning by staged combustion

F23B 2700/022

with various types of fume afterburners

F23B 2700/023

with various arrangements not otherwise provided for

F23B 2700/037

Burners for solid or solidified fuel, e.g. metaldehyde blocks

F23B 2900/00

Special features of, or arrangements for combustion apparatus using solid fuels; Combustion processes therefor

F23B 2900/00001

Combustion chambers with integrated fuel hopper

F23B 2900/00003

Combustion devices specially adapted for burning metal fuels, e.g. Al or Mg

F23B 2900/00004

Means for generating pulsating combustion of solid fuel

F23B 2900/00005

Means for applying acoustical energy to flame

F23B 2900/00006

Means for applying electricity to flame, e.g. an electric field

F23B 2900/99001

Retrofitting or converting solid fuel stoves to gas or liquid fuels