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FEEDING FUEL TO COMBUSTION APPARATUS (fuel feeders specially adapted for fluidised-bed combustion apparatus F23C 10/22; regulating or controlling combustion F23N)
Definition statement
This subclass covers:

General arrangements for preparing and supplying fuel to a combustion apparatus, including accessories and peripheral devices such as for example pumps, pulverisers, pre-heaters or vaporisers, arrangements for adding chemicals to fuels, subdivided according to the type of the fuel which is burned.

Details of devices specially adapted to feed or prepare fuels.

References relevant to classification in this subclass
This subclass does not cover:

Fuel feeders specially adapted for fluidised bed combustion apparatus

Regulating or controlling combustion

Examples of places where the subject matter of this class is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Fuel feeders specially adapted for feeding waste to incinerating apparatus

Fuel feeders incorporated into combustion apparatus for burning solid fuel

Informative references
Attention is drawn to the following places, which may be of interest for search:

Filtration in general

Mixing in general

Pulverizing in general

Drying

Conveying in general

Pumps in general

Special rules of classification within this subclass

In this subclass, the first place priority rule is applied, i.e. at each hierarchical level, classification is made in the first appropriate place.

When classifying in this subclass, add codes F23K 2200/00-F23K 2401/201;

Glossary of terms
In this subclass, the following terms (or expressions) are used with the meaning indicated:

Air

a mixture of gases containing free oxygen and able to promote or support combustion

Primary air

air supplied to the burning fuel in order to liberate combustible gases

Secondary air

air supplied to the combustible gases liberated by the primary air in order to complete their combustion. The term "secondary air" covers "tertiary air" etc.

Ash

means any solid combustion residues, for example remaining in the fuel bed or suspended in the flue gases

Burner

a device by which fluid fuel or solid fuel suspended in air is passed to a combustion space where it burns to produce a self-supporting flame

Combustion

means the direct combination of oxygen gas,e.g. in air, and a burnable substance

Combustion chamber

a chamber in which fuel is burned to establish a self-supporting fire or flame and which surrounds that fire or flame

Combustion zone

the part of the apparatus where the reaction takes place between air and fuel

Flue gases

any gaseous products of combustion

Grate

a perforated surface, e.g. a grid, which supports or delimits a bed of burning fuel and serves to supply primary air

Synonyms and Keywords

In patent documents the expression/word "boiler" is often used with the meaning "combustion apparatus".

In patent documents the expression/word "burner" is often used with the meaning "combustion apparatus".

Spreader stokers
Definition statement
This subgroup covers:

Feeding devices wherein the fuel is fed by scattering it over the fuel-supporting surface.

Feeding or distributing other fuel to combustion apparatus
References relevant to classification in this group
This group does not cover:

Preheating devices in burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space

Vaporizing devices in burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space

Informative references
Attention is drawn to the following places, which may be of interest for search:

Pumps in General

Safety arrangements for combustion chambers

Feeding or distributing systems using pumps (F23K 5/06 takes precedence)
References relevant to classification in this group
This subgroup does not cover:

Feeding or distributing systems using pumps from a central source to a plurality of burners

Safety devices (F23K 5/18 takes precedence; safety arrangements for combustion chambers F23M 11/00)
References relevant to classification in this group
This subgroup does not cover:

Cleaning or purging devices, e.g. filters

This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013