HEATING BOILER Russian patent published in 2001 - IPC

FIELD: preheating of heat-transfer agent; heating of living spaces and production areas equipped with water heating systems at forced circulation of heat-transfer agent. SUBSTANCE: heating boiler has insulated shell with furnace in its lower portion; furnace chamber is provided with gas burners; heat exchanger in form of tube bundle is arranged under burners; tubes are connected to inlet and outlet water headers; flue gas header with outlet hole is arranged in upper portion. Tubes of heat exchanger are made from copper or from copper-and-nickel alloy and water headers are made from cast iron. Each tube of heat exchanger is provided with baffles. Flue gas header is provided with flue gas flow draft interrupter. Boiler is also provided with control unit which includes relay showing presence of draft fitted in flue gas header and relay showing presence of water flow in inlet header; both relays are connected with ignition unit. EFFECT: enhanced efficiency of utilization of heat of boiler flue gases; possibility of performing unattended maintenance. 2 cl, 3 dwg