F23BMETHODS 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, C11C5/00, F23C, F23D; using solid fuel suspended in air F23C, F23D1/00; using solid fuel suspended in liquids F23C, F23D11/00; using solid fuel and fluent fuel simultaneously or alternately F23C, F23D17/00; 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 F24HThis 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 F23B90/00. In this subclass, it is desirable to add the indexing codes of groups F23B2101/00 - F23B2900/00.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. F23B1/00 F23B1/00Combustion apparatus using only lump fuel F23B1/02for indirect heating of a medium in a vessel, e.g. for boiling water steam generation F22 F23B1/04External furnaces, i.e. with furnace in front of the vessel F23B1/06for heating water-tube boilers, e.g. Tenbrink flue furnaces F23B1/08Internal furnaces, i.e. with furnaces inside the vessel F23B1/10for heating locomotive boilers F23B1/12with a plurality of combustion chambers F23B1/16the combustion apparatus being modified according to the form of grate or other fuel support for incinerators F23G5/002 F23B1/165using roller grate F23B1/18using inclined grate F23B1/20using step-type grate F23B1/22using travelling grate F23B1/24using rotating grate F23B1/26using imperforate fuel supports F23B1/28using ridge-type grate, e.g. for combustion of peat, sawdust, or pulverulent fuel combustion of peat, sawdust F23G7/10 F23B1/30characterised by the form of combustion chamber F23B1/32rotating F23B1/34annular F23B1/36shaft-type F23B1/38for combustion of peat, sawdust, or pulverulent fuel on a grate or other fuel support combustion of peat, sawdust F23G7/10 F23B3/00Combustion apparatus which is portable or removable with respect to the boiler or other apparatus which is heated F23B5/00Combustion apparatus with arrangements for burning uncombusted material from primary combustion combustion apparatus characterised by the combination of two or more combustion chambers F23C6/00; the primary combustion being pulverulent fuel F23C9/003 F23B5/02in main combustion chamber F23B5/025recirculating uncombusted solids to combustion chamber F23B5/04in separate combustion chamber; on separate grate F23B7/00Combustion techniques; Other solid-fuel combustion apparatus F23B7/002characterised by gas flow arrangements F23B7/005with downdraught through fuel bed and grate F23B7/007with fluegas recirculation to combustion chamber F23B10/00Combustion apparatus characterised by the combination of two or more combustion chambers F23B10/02including separate secondary combustion chambers F23B20/00Combustion apparatus specially adapted for portability or transportability F23B30/00Combustion apparatus with driven means for agitating the burning fuelCombustion apparatus with driven means for advancing the burning fuel through the combustion chamber F23B30/02with movable, e.g. vibratable, fuel-supporting surfaceswith fuel-supporting surfaces that have movable parts F23B30/04with fuel-supporting surfaces that are rotatable around a horizontal or inclined axis and support the fuel on their inside, e.g. cylindrical grates F23B30/06with fuel supporting surfaces that are specially adapted for advancing fuel through the combustion zone F23B30/08with fuel-supporting surfaces that move through the combustion zone, e.g. with chain grates F23B30/10with 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 F23B40/00Combustion apparatus with driven means for feeding fuel into the combustion chamber F23B40/02the fuel being fed by scattering over the fuel-supporting surface F23B40/04the fuel being fed from below through an opening in the fuel-supporting surface F23B40/06the fuel being fed along the fuel-supporting surface F23B40/08into pot- or trough-shaped grates F23B50/00Combustion 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 F23B50/02the fuel forming a column, stack or thick layer with the combustion zone at its bottom F23B50/04the movement of combustion air and flue gases being substantially transverse to the movement of the fuel F23B50/06the flue gases being removed downwards through one or more openings in the fuel-supporting surface F23B50/08with fuel-deflecting bodies forming free combustion spaces inside the fuel layer F23B50/10with the combustion zone at the bottom of fuel-filled conduits ending at the surface of a fuel bed F23B50/12the 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 F23B60/00Combustion apparatus in which the fuel burns essentially without moving F23B60/02with combustion air supplied through a grate F23B70/00Combustion apparatus characterised by means returning solid combustion residues to the combustion chamber F23B80/00Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel F23B80/02by means for returning flue gases to the combustion chamber or to the combustion zone F23B80/04by means for guiding the flow of flue gases, e.g. baffles F23B90/00Combustion methods not related to a particular type of apparatusGroups F23B90/00 - F23B90/08 correspond to IPC2012.01 F23B90/02Start-up techniques F23B90/04including secondary combustion in separate combustion chambers F23B10/02 F23B90/06the primary combustion being a gasification or pyrolysis in a reductive atmosphere F23B90/08in the presence of catalytic material F23B99/00Subject matter not provided for in other groups of this subclass F23B2101/00Indexing scheme related to adaptation of combustion apparatus to boilers F23B2101/00Adaptation of combustion apparatus to boilers in which the combustion chamber is situated inside the boiler vessel, e.g. surrounded by cooled surfaces F23B2103/00Adaptation of combustion apparatus for placement in or against an opening of a boiler, e.g. for replacing an oil burner F23B2103/02for producing an essentially horizontal flame F23B2700/00Combustion apparatus for solid fuel F23B2700/003adapted for use in water-tube boilers F23B2700/004adapted for use in Tenbrink boilers F23B2700/005adapted for use in locomotives F23B2700/006Details of locomotive combustion apparatus F23B2700/007with pressurised combustion chambers F23B2700/008with interchangeable combustion chambers F23B2700/009adapted for use in various steam boilers F23B2700/01adapted for boilers built up from sections F23B2700/011with fuel shaft for steam boilers F23B2700/012with predrying in fuel supply area F23B2700/013for use in baking ovens or cooking vessels F23B2700/014for use in reverberatory furnaces F23B2700/018with fume afterburning by staged combustion F23B2700/022with various types of fume afterburners F23B2700/023with various arrangements not otherwise provided for F23B2700/037Burners for solid or solidified fuel, e.g. metaldehyde blocks F23B2900/00Special features of, or arrangements for combustion apparatus using solid fuelsCombustion processes therefor F23B2900/00001Combustion chambers with integrated fuel hopper F23B2900/00003Combustion devices specially adapted for burning metal fuels, e.g. Al or Mg F23B2900/00004Means for generating pulsating combustion of solid fuel F23B2900/00005Means for applying acoustical energy to flame F23B2900/00006Means for applying electricity to flame, e.g. an electric field F23B2900/99001Retrofitting or converting solid fuel stoves to gas or liquid fuels