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SUPERHEATING OF STEAM (steam separating arrangements in boilers F22B 37/26)
Definition statement
This subclass/group covers:

This subclass covers general aspects of, or methods for, generating superheated steam. Methods of steam superheating characterised by the form of heating method and by location, arrangement and disposition, constructional features of steam superheaters, control systems for controlling superheat temperature and all component parts or details of steam superheaters are covered. Thereby this subclass is limited in only methods of, or apparatus for, the generation of superheated steam for heating or power purposes.

Relationship between large subject matter areas

Methods of steam generation and steam boilers are classified in F22B, economisers and all aspect concerning feed water supply and circulation of feed water in boilers are classified in F22D, engine plants where engine aspects predominate are classified in F01K, domestic central heating systems using steam are classified in F24D, heat exchange or heat transfer in general is classified in F28 and the generation of vapour in cores of nuclear reactors is classified in G21.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Steam accumulators specially adapted for superheated steam
Plants having heaters one heater being a fired superheater
Plants with steam conversion
Plants having heaters with heating by live steam for superheating or reheating
Boilers heated electrically
Boilers of once-through type built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes
Boilers with separate combustion apparatus for the boiler and the superheater respectively
Central heating systems operating with superheated steam
Compression machines, plants or systems with non-reversible cycles comprising superheaters
Nuclear moderator wherein one zone is a superheating zone
Reactors with engines with the engine working fluid superheated by the reactor coolant
Reactors with engines with the engine working fluid superheated by a separate heat source
Special rules of classification within this subclass

Attention is drawn to the definition of superheated "steam" and superheated "vapour". In cases where a specific entry for vapour is missing, documents related to special superheated vapours are classified in groups where only superheated "steam" is explicitly mentioned.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Desuperheater
Reduction of superheated steam temperature
Attemperator
Reduction of superheated steam temperature by bringing superheated steam into direct contact with water or steam or mixtures thereof.
Steam conditioners
Reduction of superheated steam to the needed temperature
Steam superheating characterised by heating method (exothermal chemical reactions not involving a supply of free oxygen gas, apparatus or devices for using the heat therefrom F24J)
Definition statement
This subclass/group covers:

Superheaters and methods of generation of superheated steam characterised by the heating method, such as the heat being supplied by steam, by hot flue gases from a furnace or a steam boiler, by radiation, by chemical radiation or by a separate heat source independent from heat supply of the steam boiler, including electrically heated superheaters. Furthermore methods of creating superheated steam by throttling such as reducing the pressure or direct superheaters such as devices and methods for mixing steam with furnace gases or other combustion products are classified in this main group

Relationship between large subject matter areas

Methods of steam generation, where there is not mentioned, that the generated steam is superheated and characterised by form of heating method are classified in F22B 1/00.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Plants with steam as working fluid created by combustion of hydrogen with oxygen
Steam production by combustion of hydrogen with oxygen
Steam separating arrangements with separator reheaters
Plants characterised by the use of steam or heat accumulators with steam conversion
Steam boilers of furnace-tube type
Steam boilers heated electrically
Plants characterised by the use of steam or heat accumulators having heaters using heat from a specified chemical reaction
Plants characterised by the use of steam or heat accumulators having heaters using nuclear heat with a fired superheater
Steam engine plants using mixtures of steam gas (direct evaporator or superheater)
Controlling superheat temperature with water injection in combination with steam pressure reducing valves
Special rules of classification within this group

When superheated steam is created only by the exothermic combustion of oxygen and hydrogen, then the groups F22B 1/003 and F01K 25/005 should also be considered.

Steam superheaters characterised by constructional features; Details of component parts thereof (general aspects of enclosed heat-exchangers F28D)
Definition statement
This subclass/group covers:

Constructional features and details of component parts of steam superheaters such as steam tube arrangements, superheater drain arrangements, steam tubes with steam flowing in opposite direction in one pipe, annular steam tubes, steam superheaters with heating tubes, headers and collectors of superheaters. Furthermore arrangements for the protection of superheater elements and connecting or sealing of superheater tubes are covered.

Relationship between large subject matter areas

Component parts or details of steam boilers are classified in F22B 37/00, which contains much more entries than F22G 3/00.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Details and accessories of water tubes in steam boilers
Steam superheaters characterised by their location
Water tube boiler built-up from sets of spaced double-walled water tubes of return type
Water tube boiler built-up from sets of tubes with internally-arranged flue tubes (annular steam tubes)
Drums, headers and accessories therefor
Arrangements on drums or collectors for fixing tubes or for connecting collectors to each other
Controlling superheat temperature (control systems for steam boilers F22B; regulating or controlling in general G05)
Definition statement
This subclass/group covers:

Methods and devices for controlling superheat steam by regulating flue gas flow, by circulating flue gases, by displacing superheater sections, by attemperating the superheated steam (i. e. spraying water into steam), by indirectly cooling or heating the superheated steam in auxiliary enclosed heat-exchangers, by by-passing steam around superheater sections. Furthermore applications of combustion-control devices and combined control procedures for controlling superheat temperature are covered.

Relationship between large subject matter areas

Control of steam boilers in general are covered by the group F22B 35/00

Informative references
Attention is drawn to the following places, which may be of interest for search:
Spray mixers
Plants characterised by the use of steam or heat accumulators with steam conversion
Control of steam boilers by flue gas dampers
Control of steam boilers by circulating flue gases
Control of steam boilers by injecting water
Control systems of steam boilers with auxiliary heating surfaces
Steam superheating with the heat being supplied by steam
Steam superheating with provisions for superheating by throttling (pressure reduction)
Steam superheaters characterised by location, arrangement, or disposition
Definition statement
This subclass/group covers:

Steam superheaters, which are characterised by their location, arrangement or disposition, like superheaters being located in locomotive boilers, in fire tubes, in jackets around fire tubes, in furnace tubes, in fire boxes, in smoke boxes, in flues or in water-tube boilers.

Relationship between large subject matter areas

Methods of steam generation and steam boilers are classified in F22B

Informative references
Attention is drawn to the following places, which may be of interest for search:
Steam locomotives
Steam boilers of drum type
Steam boilers of combined fire tube type and water tube type
Steam boilers of fire box type
Steam boilers of water tube type
Instantaneous of flash steam boilers
Steam boilers of forced flow type
Modifications of boiler construction
Steam boilers of furnace tube type
Steam boilers of fire tube type
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Last Modified: 10/11/2013