Feed-water heaters

FMECHANICAL ENGINEERING LIGHTING HEATING WEAPONS BLASTING ENGINES OR PUMPS F22Steam generation F22DPREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FEED-WATER SUPPLY CONTROLLING WATER LEVEL AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN BOILERS

F22D1/00Feed-water heaters

F22D1/003Feed-water heater systems F22D1/006with heating tubes F22D1/02with water tubes arranged in the boiler furnace, fire tubes, or flue ways F22D1/04the tubes having plain outer surfaces F22D1/06in horizontal arrangement F22D1/08the tubes having fins, ribs, gills, corrugations, or the like on their outer surfaces F22D1/10in horizontal arrangement F22D1/12Control devices F22D1/14Safety or venting devices F22D1/16with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways F22D1/18and heated indirectly F22D1/20and directly connected to boilers F22D1/22and provided for rotary movements F22D1/24with fire tubes or flue ways traversing feed-water vessels F22D1/26with means, other than tubes, to separate water and heating medium F22D1/28for direct heat transfer F22D1/30with stages, steps, baffles, dishes, circular troughs, or other means to cause interrupted or cascading fall of water F22D1/32arranged to be heated by steam F22D1/325Schematic arrangements or control devices therefor F22D1/34and returning condensate to boiler with main feed supply F22D1/36Water and air preheating systems F22D1/38Constructional features of water and air preheating systems F22D1/40Combinations of exhaust-steam and smoke-gas preheaters F22D1/42specially adapted for locomotives F22D1/44Smoke-gas preheaters F22D1/46Exhaust-steam preheaters F22D1/48Details F22D1/50incorporating thermal de-aeration of feed-water