IPC 7 English version F22G-F22G 7/14

F22G-F22G00714

SECTION F – MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING

F 22

STEAM GENERATION (chemical or physical apparatus for generating gases B01J; chemical generation of gas, e.g. under pressure, Section C; removal of combustion products or residues, e.g. cleaning of the combustion contaminated surfaces of tubes of boilers, F23J; generating combustion products of high pressure or high velocity F23R; water heaters not for steam generation F24H, F28; cleaning of internal or external surfaces of heat-transfer conduits, e.g. water tubes of boilers, F28G)

F 22 G

SUPERHEATING OF STEAM (steam-separating arrangements in boilers F22B 37/26)

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)

with heat supply by hot flue gases from the furnace of the steam boiler

by diverting flow or hot flue gases to separate superheaters operating in reheating cycle, e.g. for reheating steam between a high-pressure turbine stage and an intermediate turbine stage

with heat supply predominantly by radiation

from heated brickwork or the like

with provision for superheating by throttling

by mixing steam with furnace gases or other combustion products

using heat generated by chemical reactions

by using a separate heat source independent from heat supply of the steam boiler, e.g. by electricity, by auxiliary combustion of fuel oil

Steam superheaters characterised by constructional features; Details or component parts thereof (general aspects of enclosed heat-exchangers F28D)

Controlling superheat temperature (control systems for steam boilers F22B; regulating or controlling in general G05)

Applications of combustion-control devices, e.g. tangential-firing burners, tilting burners

by regulating flue gas flow, e.g. by proportioning or diverting

by recirculating flue gases

preventing furnace gas backflow through recirculating fan

by displacing superheater sections

by attemperating the superheated steam, e.g. by injected water sprays (spray-mixers B01F 5/18)

by live steam

by indirectly cooling or heating the superheated steam in auxiliary enclosed heat-exchanger

by by-passing steam around superheater sections

by combined controlling procedures

Steam superheaters characterised by location, arrangement, or disposition

in fire tubes

in jackets around fire tubes

in furnace tubes

in fire-boxes

in smoke-boxes

in flues

in water-tube boilers, e.g. between banks of water tubes