UTILITY HOT-WATER BOILER Russian patent published in 1996 - IPC

FIELD: heat engineering. SUBSTANCE: natural-draft utility hot-water boiler comprises casing 1 and central shell 4 with upper and lower bottom plates and a water jacket therebetween connected to lower inlet 3 and upper outlet 11 branch pipes. Combustion chamber with burners 6 in shell 4 communicates with gas duct 12 while vortex generators 7 in the form of pipes arranged across the axis of shell 4 and communicating with water jacket are mounted in rows and have pipes of more than one dimater in a row, or pipes of the same diameter which increases in each next row towards gas duct 12, or pipes of the same diameter in all the rows. The number of said pipes in the rows is either the same or varies, or increases from one row to the next one towards gas duct 12. EFFECT: higher efficiency, lower fuel consumption and metal content. 6 dwg