STEAM BOILER AT PERIODIC DELIVERY OF FEED WATER Russian patent published in 2001 - IPC

FIELD: steam boilers. SUBSTANCE: steam boilers at periodic delivery of feed water; natural- circulation boilers at output of 0.25 to 1.6 tons of steam per hour. Boiler is provided with economizer and mixing tank which are interconnected forming closed loop for circulation of feed water where lower portion of mixing tank is brought into communication feed water inlet of economizer and its upper portion is provided with cold feed water inlet, hot water inlet (from economizer) and feed water outlet to boiler which are located one above another. Volume of water in mixing tank exceeds volume of water in boiler by at least four times between its upper and lower working levels. Mixing tank may be arranged inside shell of steam boiler; according to this version, it is made from moisture-proof heat-insulated material, such as rubber, paronite, etc. EFFECT: possibility of recovery of flue gas heat under conditions of periodic delivery of feed water. 3 cl, 1 dwg