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