FIRE-TUBE HEATING BOILER BURNING GASEOUS AND LIQUID FUELS Russian patent published in 2004 - IPC

FIELD: water heating for communal and industrial services.

SUBSTANCE: boiler has cylindrical water-supply shell with butt-end tube sheets and setting that accommodates blind cylindrical flame box disposed on distant end of burner and secured in front tube sheet, as well as two runs of fire tubes arranged over concentric circumferences coaxial with flame box which are secured in holes of front tube sheet. Fixed in holes of rear tube sheet are second-run fire tubes only and those of first run are secured in holes disposed over periphery in rear part of flame tube, for instance by means of T-shaped adapters. First-run fire tubes have large diameter compared with that of second-run ones and they are uniformly arranged over circumference in water space; second-run fire tubes have smaller diameter than first-run tubes and are uniformly disposed over two circumferences between first-run tubes.

EFFECT: enhanced intensification of heat transfer and reduced size of boiler.

2 cl, 2 dwg