BOILER Russian patent published in 1999 - IPC

FIELD: heat-power engineering. SUBSTANCE: boiler has cylindrical shell with water inlet branch pipe, water volume with free convection, flue and fire tubes, swivel chamber from flue tube to fire tubes whose front wall is made in form of tube sheet for fire tubes. Mounted on tube sheet of swivel chamber is cooling chamber with flue tubes passing through it; cooling chamber is rigidly secured to tube sheet connected with water inlet branch pipe and provided with two outlet holes over periphery of flue tube. Cooling chamber mounted on tube sheet excludes erosion cracking and burning-out of fire tubes and tube sheet causing emergency shut-down of boiler. EFFECT: enhanced reliability and economical efficiency of boiler. 1 dwg