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REGULATING OR CONTROLLING COMBUSTION (control devices specially adapted for fluidised-bed combustion apparatus F23C 10/28; condition reponsive controls for regulating combustion in domestic stoves with open fires for solid fuel F24B 1/187)
Definition statement
This subclass/group covers:

Means and methods for regulating or controlling combustion, including details of the accessories and components for carrying out said controls such as for example fuel valves, detectors, sensors, timers independently of the type of the fuel which is burned.

Safety controls.

Pneumatic, electronic, electrical or hydraulic circuits used for controlling or regulating combustion.

References relevant to classification in this subclass
This subclass/group does not cover:
Control devices specially adapted for fluidised-bed combustion apparatus
Condition reponsive controls for regulating combustion in domestic stoves with open fires for solid fuel

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:

Control devices specially adapted for incinerators
Informative references
Attention is drawn to the following places, which may be of interest for search:
Control systems for gas turbine plants
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 subgroup, add the Indexing Codes F23N 1/00-F23N 2041/22 and F23N 2900/00-R23N900/11.

Glossary of terms
In this subclass/group, 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
Firebridge
a low wall separating the fuel bed from adjacent flue gas passages in apparatus for combustion of solid fuel, for example in reverberatory furnaces or fire-tube boilers
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".

Regulating fuel supply
Definition statement
This subclass/group covers:

Regulating fuel supply.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Regulating fuel supply conjointly with air supply and draft
Regulating fuel supply conjointly with draft
Regulating fuel supply conjointly with another medium, e.g. boiler water
Regulating fuel supply conjointly with another medium, e.g. boiler water, and air supply or draught
Regulating air supply or draught (conjointly with fuel supply F23N 1/00)
Definition statement
This subclass/group covers:

Regulating air supply or draught.

References relevant to classification in this group
This subclass/group does not cover:
Regulating air supply conjointly with fuel supply
Informative references
Attention is drawn to the following places, which may be of interest for search:
Regulating draught by direct pressure operation of single valves or dampers
Regulating air supply or draught by operation of single valves or dampers by temperature sensitive elements
Regulating air supply or draught by conjoint operation of two or more valves or dampers
Regulating air supply or draught by power-assisted systems
by conjoint operation of two or more valves or dampers (F23N 3/08 takes precedence)
References relevant to classification in this group
This subclass/group does not cover:
Regulating air supply or draught by power-assisted systems
Systems for controlling combustion (F23N 1/00, F23N 3/00 take precedence)
Definition statement
This subclass/group covers:

Systems for controlling combustion.

References relevant to classification in this group
This subclass/group does not cover:
Regulating fuel supply
Regulating air supply or draught
Informative references
Attention is drawn to the following places, which may be of interest for search:
Testing of other ignition means, e.g. flame
Controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium, in particular using bimetallic elements
Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium, in particular using bellows or diaphragms
Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium, in particular using light-sensitive elements
Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium, in particular using thermocouples
Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium, in particular using ionisation-sensitive elements, i.e. flame rods
Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium, in particular using thermo-sensitive resistors
Controlling combustion using detectors sensitive to rate of flow of air or fuel
Controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
Controlling combustion with a time programme acting through mechanical means, e.g. using cams
Preventing development of abnormal or undesired conditions, i.e. safety arrangements
Details relating to combustion controls
Analysing gases by investigating the ionisation by using heat
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Last Modified: 10/11/2013