|  | F |
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

|  | F01 - F04 |
Subsection index
MACHINES |
positive displacement |
rotary or oscillating piston |
liquid and elastic fluid or elastic fluid | F01C
liquid only | F04C
reciprocating piston or other |
liquid and elastic fluid or elastic fluid | F01B
liquid only | F04B
non-positive displacement |
liquid and elastic fluid or elastic fluid | F01D
liquid only | F03B
ENGINES |
positive displacement |
rotary or oscillating piston |
liquid and elastic fluid or elastic fluid | F01C
liquid only | F03C
reciprocating piston or other |
liquid and elastic fluid or elastic fluid | F01B
liquid only | F03C
non-positive displacement |
liquid and elastic fluid or elastic fluid | F01D
liquid only | F03B
PUMPS |
positive displacement |
rotary or oscillating piston | F04C
reciprocating piston or other | F04B
non-positive displacement | F04D

LIGHTING; HEATING

|  | F23 |
COMBUSTION APPARATUS; COMBUSTION PROCESSES

|  | F23 |
Note(s) In this class, the following terms or expressions are used with the meanings indicated: "combustion" means the direct combination of oxygen gas, e.g. in air, and a burnable substance. Any other heat-producing combination of chemical substances, e.g. hydrogen peroxide and methane, iron oxide and aluminium, is covered by section C or by subclass Fulltext... Hierarchy... Expanded...F24J; "combustion chamber" means a chamber in which fuel is burned to establish a self-supporting fire or flame and which surrounds that fire or flame; "burner" means a device by which fluent fuel is passed to a combustion space where it burns to produce a self-supporting flame; "air" means a mixture of gases containing free oxygen and able to promote or support combustion.

|  | F23C |
METHODS OR APPARATUS FOR COMBUSTION USING FLUENT FUEL (burners Fulltext... Hierarchy... Expanded...F23D)

|  | F23C |
Note(s) In this subclass, methods are classified in the groups that cover the apparatus used. [8]

|  | F23C |
Subclass index
COMBUSTION APPARATUS SPECIALLY ADAPTED FOR COMBUSTION OF TWO OR MORE TYPES OF FUEL | 1/00
COMBINATIONS OF TWO OR MORE COMBUSTION CHAMBERS | 6/00
FUNCTIONAL TYPES OF COMBUSTION APPARATUS |
Fluidised bed combustion | 10/00
Catalytic combustion | 13/00
Resonant combustion | 15/00
COMBUSTION APPARATUS CHARACTERISED BY SUBSYSTEMS |
Combustion chambers | 3/00
Arrangement or mounting of burners | 5/00
Air supply | 7/00
Arrangements for returning flue gases or combustion products | 9/00
SUBJECT MATTER NOT PROVIDED FOR IN OTHER GROUPS OF THIS SUBCLASS | 99/00

P:10 |  | F23C 1/00 |
Combustion apparatus specially adapted for combustion of two or more kinds of fuel simultaneously or alternately, at least one kind of fuel being fluent (combustion apparatus characterised by the combination of two or more combustion chambers Fulltext... Hierarchy... Expanded...F23C 6/00; pilot flame igniters Fulltext... Hierarchy... Expanded...F23Q 9/00) [1,7,8]

P:50 |  | F23C 3/00 |
Combustion apparatus characterised by the shape of the combustion chamber (Fulltext... Hierarchy... Expanded...F23C 15/00 takes precedence) [1,7,8]

P:70 |  | F23C 5/00 |
Combustion apparatus characterised by the arrangement or mounting of burners [1,7,8]

P:0 |  | F23C 6/00 |
Combustion apparatus characterised by the combination of two or more combustion chambers [3,7,8]

P:80 |  | F23C 7/00 |
Combustion apparatus characterised by arrangements for air supply (inlets for fluidisation air Fulltext... Hierarchy... Expanded...F23C 10/00) [1,7,8]

P:60 |  | F23C 9/00 |
Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber (fluidised bed combustion apparatus with means for recirculation of particles entrained from the bed Fulltext... Hierarchy... Expanded...F23C 10/00; fluidised bed combustion apparatus with devices for removal and partial reintroduction of material from the bed Fulltext... Hierarchy... Expanded...F23C 10/00) [1,7,8]

P:30 |  | F23C 10/00 |
Apparatus in which combustion takes place in a fluidised bed of fuel or other particles [7]

|  | F23C 10/01 |
· | in a fluidised bed of catalytic particles [8]

P:40 |  | F23C 13/00 |
Apparatus in which combustion takes place in the presence of catalytic material (in a fluidised bed of catalytic particles Fulltext... Hierarchy... Expanded...F23C 10/01; radiant gas burners using catalysis for flameless combustion Fulltext... Hierarchy... Expanded...F23D 14/18) [8]

|  | F23C 13/02 |
· | characterised by arrangements for starting the operation, e.g. for heating the catalytic material to operating temperature [8]

|  | F23C 13/04 |
· | characterised by the arrangement of two or more catalytic elements in series connection [8]

|  | F23C 13/06 |
· | in which non-catalytic combustion takes place in addition to catalytic combustion, e.g. downstream of a catalytic element [8]

|  | F23C 13/08 |
· | characterised by the catalytic material [8]

P:20 |  | F23C 15/00 |
Apparatus in which combustion takes place in pulses influenced by acoustic resonance in a gas mass [8]

P:90 |  | F23C 99/00 |
Subject matter not provided for in other groups of this subclass [8]