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

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 |
COMBUSTION APPARATUS USING FLUENT FUEL (combustion apparatus for solid fuel only Fulltext... Hierarchy... Expanded...F23B; burners Fulltext... Hierarchy... Expanded...F23D; constructional details of combustion chambers not otherwise provided for Fulltext... Hierarchy... Expanded...F23M; combustion chambers for generating combustion products of high pressure or high velocity Fulltext... Hierarchy... Expanded...F23R)

|  | F23C |
Subclass index
APPARATUS |
For burning two or more kinds of combustibles | 1/00
Characterised by shape of combustion chamber; by two or more chambers | 3/00; 6/00
With recycling of combustion products | 9/00
For fluidised bed combustion | 10/00
Other apparatus | 11/00
MOUNTING, DISPOSITION OF BURNERS | 5/00
AIR-SUPPLY ARRANGEMENTS | 7/00

|  | F23C 1/00 |
Combustion apparatus for burning two or more kinds of fuel simultaneously or alternatively, at least one kind of fuel being fluent (Fulltext... Hierarchy... Expanded...F23C 10/00 takes precedence; with after-burning arrangements Fulltext... Hierarchy... Expanded...F23C 9/00; one kind being for ignition of the other Fulltext... Hierarchy... Expanded...F23Q) [1,7]

|  | F23C 1/02 |
· | lump or liquid fuel

|  | F23C 1/04 |
· | lump or gaseous fuel

|  | F23C 1/06 |
· | lump or pulverulent fuel

|  | F23C 1/08 |
· | liquid or gaseous fuel

|  | F23C 1/10 |
· | liquid or pulverulent fuel

|  | F23C 1/12 |
· | gaseous or pulverulent fuel

|  | F23C 3/00 |
Combustion apparatus characterised by the shape of the combustion chamber (Fulltext... Hierarchy... Expanded...F23C 10/00 takes precedence) [1,7]

|  | F23C 5/00 |
Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus (Fulltext... Hierarchy... Expanded...F23C 1/00, Fulltext... Hierarchy... Expanded...F23C 10/00, Fulltext... Hierarchy... Expanded...F23C 11/04 take precedence) [1,7]

|  | F23C 5/02 |
· | Structural details of mounting

|  | F23C 5/06 |
· · | Provision for adjustment of burner position during operation

|  | F23C 5/08 |
· | Disposition of burners

|  | F23C 5/14 |
· · | to obtain a single flame of concentrated or substantially planar form, e.g. pencil or sheet flame (Fulltext... Hierarchy... Expanded...F23C 5/32 takes precedence) [3]

|  | F23C 5/24 |
· · | to obtain a loop flame

|  | F23C 5/28 |
· · | to obtain flames in opposing directions, e.g. impacting flames

|  | F23C 5/32 |
· · | to obtain rotating flames, i.e. flames moving helically or spirally [3]

|  | F23C 6/00 |
Combustion apparatus characterised by the combination of two or more combustion chambers (Fulltext... Hierarchy... Expanded...F23C 10/00 takes precedence) [3,7]

|  | F23C 6/02 |
· | in parallel arrangement [3]

|  | F23C 6/04 |
· | in series connection (consuming smoke or fumes in separate combustion apparatus Fulltext... Hierarchy... Expanded...F23G 7/06) [3]

|  | F23C 7/00 |
Air-supply arrangements (Fulltext... Hierarchy... Expanded...F23C 10/00 takes precedence; in general Fulltext... Hierarchy... Expanded...F23L) [1,7]

|  | F23C 7/02 |
· | Disposition of air supply not passing through burner (to obtain a cyclonic tapering flame when burning pulverulent fuel Fulltext... Hierarchy... Expanded...F23C 5/32)

|  | F23C 7/04 |
· · | to obtain maximum heat transfer to wall of combustion chamber

|  | F23C 7/06 |
· · | for heating the incoming air (arrangements of regenerators or recuperators Fulltext... Hierarchy... Expanded...F23L 15/00)

|  | F23C 7/08 |
· · · | indirectly by a secondary fluid other than the combustion products

|  | F23C 9/00 |
Combustion apparatus with arrangements for recycling or recirculating combustion products or flue gases (Fulltext... Hierarchy... Expanded...F23C 10/00 takes precedence) [1,7]

|  | F23C 9/06 |
· | for completing combustion [3]

|  | F23C 9/08 |
· | for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber [3]

|  | F23C 10/00 |
Fluidised bed combustion apparatus [7]

|  | F23C 10/00 |
Note(s) In this group, it is desirable to add the indexing code of group Fulltext... Hierarchy... Expanded...F23C 101/00. The indexing code should be unlinked. [7]

|  | F23C 10/02 |
· | with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed [7]

|  | F23C 10/04 |
· · | the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone [7]

|  | F23C 10/06 |
· · · | the circulating movement being promoted by inducing differing degrees of fluidisation in different parts of the bed [7]

|  | F23C 10/08 |
· · · | characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases [7]

|  | F23C 10/10 |
· · · · | the separation apparatus being located outside the combustion chamber [7]

|  | F23C 10/12 |
· · | the particles being circulated exclusively within the combustion zone [7]

|  | F23C 10/14 |
· · · | the circulating movement being promoted by inducing differing degrees of fluidisation in different parts of the bed [7]

|  | F23C 10/16 |
· | specially adapted for operation at superatmospheric pressures, e.g. by the arrangement of the combustion chamber and its auxiliary systems inside a pressure vessel [7]

|  | F23C 10/18 |
· | Details; Accessories [7]

|  | F23C 10/20 |
· · | Inlets for fluidisation air, e.g. grids; Bottoms [7]

|  | F23C 10/22 |
· · | Fuel feeders specially adapted for fluidised bed combustion apparatus (Fulltext... Hierarchy... Expanded...F23C 10/26 takes precedence) [7]

|  | F23C 10/24 |
· · | Devices for removal of material from the bed (devices for controlling the level of the bed or the amount of material in the bed Fulltext... Hierarchy... Expanded...F23C 10/30) [7]

|  | F23C 10/26 |
· · · | combined with devices for partial reintroduction of material into the bed, e.g. after separation of agglomerated parts [7]

|  | F23C 10/28 |
· · | Control devices specially adapted for fluidised bed combustion apparatus [7]

|  | F23C 10/30 |
· · · | for controlling the level of the bed or the amount of material in the bed [7]

|  | F23C 10/32 |
· · · · | by controlling the rate of recirculation of particles separated from the flue gases [7]

|  | F23C 11/00 |
Combustion apparatus using fluent fuel, not provided for in groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...F23C 1/00-F23C 10/00

|  | F23C 11/02 |
( transferred to Fulltext... Hierarchy... Expanded...F23C 10/00 )

|  | F23C 11/04 |
· | Combustion apparatus for producing resonant combustion (for generating combustion products of high pressure or high velocity Fulltext... Hierarchy... Expanded...F23R) [3]

|  | F23C 101/00 |
Indexing scheme associated with group Fulltext... Hierarchy... Expanded...F23C 10/00, relating to combustion in entrained fluidised beds. The indexing code should be unlinked. [7]

|  | F23C 101/00 - F23C 101/00 |
Note(s) Attention is drawn to Chapter IV of the Guide which sets forth the rules concerning the application and presentation of the different types of indexing code. [7]

|  | F23C 101/00 |
Combustion in entrained fluidised beds, i.e. fluidised beds which have no distinct upper surface [7]