STEAM BOILER Russian patent published in 1997 - IPC

FIELD: heat power engineering. SUBSTANCE: upper and lower drums are connected by convection tube bank. Upper and lower headers are connected to them by one end. Headers are arranged in central part of furnace and are connected by means of vertical heat exchange tubes forming side screens. Vertical headers are connected to central headers at beginning of pass-through chamber. Vertical headers are interconnected to form front screen. Tubes of ceiling and bottom screens are connected by one end at both sides with central headers and by other end, with tubes of side screens. Tubes of convection bank are arranged in staggered order. Rear upper and lower headers are installed additionally at both sides in end of furnace chamber. These headers are connected with central headers and interconnected by tubes to form rear screen. Bottom, side, ceiling and rear screens can be made of two-row design. Lower central header can be placed in communication with feed water main line. Gas directing partitions can be installed in convection tube bank. Easily melting plugs can be installed in lower generatrix of upper central header. Steam superheater can be installed in boiler. EFFECT: enhanced reliability of operation. 11 cl, 3 dwg