F22GSUPERHEATING OF STEAM steam separating arrangements in boilers F22B37/26In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme. F22G1/00 F22G1/00Steam superheating characterised by heating method exothermal chemical reactions not involving a supply of free oxygen gas, apparatus or devices for using the heat therefrom F24V30/00 F22G1/005the heat being supplied by steam F22G1/02with heat supply by hot flue gases from the furnace of the steam boiler F22G1/04by 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 F22G1/06with heat supply predominantly by radiation F22G1/08from heated brickwork or the like F22G1/10with provision for superheating by throttling F22G1/12by mixing steam with furnace gases or other combustion products F22G1/14using heat generated by chemical reactions F22G1/16by using a separate heat source independent from heat supply of the steam boiler, e.g. by electricity, by auxiliary combustion of fuel oil F22G1/165by electricity steam generation in boilers heated electrically, in general, F22B1/28 F22G3/00Steam superheaters characterised by constructional featuresDetails of component parts thereof general aspects of enclosed heat-exchangers F28D F22G3/001Steam tube arrangements not dependent of location characterised by location F22G7/00 F22G3/002with helical steam tubes F22G3/003Superheater drain arrangements F22G3/004Steam tubes with steam flowing in opposite directions in one pipe, e.g. Field tubes F22G3/005 takes precedence F22G3/005Annular steam tubes, i.e. the steam being heated between concentric tubes with the heating fluid flowing in inner and around outer tube F22G3/006Steam superheaters with heating tubes F22G3/005 takes precedence F22G3/007Headers; Collectors, e.g. for mixing F22G3/008Protection of superheater elements, e.g. cooling superheater tubes during starting-up periods, water tube screens F22G3/009Connecting or sealing of superheater or reheater tubes with collectors or distributors F22G5/00Controlling superheat temperature control systems for steam boilers F22B; regulating or controlling in general G05 F22G5/02Applications of combustion-control devices, e.g. tangential-firing burners, tilting burners F22G5/04by regulating flue gas flow, e.g. by proportioning or diverting F22G5/06by recirculating flue gases F22G5/08preventing furnace gas backflow through recirculating fan F22G5/10by displacing superheater sections F22G5/12by attemperating the superheated steam, e.g. by injected water sprays spray mixers B01F25/70 F22G5/123Water injection apparatus F22G5/126in combination with steam-pressure reducing valves F22G5/14by live steam F22G5/16by indirectly cooling or heating the superheated steam in auxiliary enclosed heat-exchanger F22G5/18by by-passing steam around superheater sections F22G5/20by combined controlling procedures F22G7/00Steam superheaters characterised by location, arrangement, or disposition F22G7/005for locomotive boilers F22G7/065, F22G7/105 take precedence F22G7/02in fire tubes F22G7/04in jackets around fire tubes F22G7/06in furnace tubes F22G7/065for locomotive boilers F22G7/08in fire-boxes F22G7/10in smoke-boxes F22G7/105for locomotive boilers F22G7/12in flues F22G7/14in water-tube boilers, e.g. between banks of water tubes F22G7/145of inclined type, i.e. the water-tube sets being inclined with respect to the horizontal plane