LOW-TEMPERATURE HOT-WATER BOILER (VARIANTS) Russian patent published in 2006 - IPC F24H1/00 

FIELD: water heaters having heat generating means, for instance boilers, flow-heaters, water-storage heaters, particularly for water-supply systems.

SUBSTANCE: boiler comprises body with fire chamber made as fire tube, as well as convective gas-tube bundle. Lower part of fire chamber in gas flow direction is connected to second-pass gas-tube bundle through inner rotary chamber so that the connection floats in boiler water. Gas-tube bundle is divided into two equal symmetric sections in gas flow direction. The sections project above upper boiler lid. Each section of second-pass gas-tube bundle extends through upper boiler lid and is limited by tube plate from section top and by connection pipe from sides thereof. The tube plate has flange. The connection pipe is secured to upper boiler lid and has mating flange. Each gas-tube bundle section with distribution chamber is made as removable member connected to inner rotary chamber from below and to mating flange of connection pipe formed on upper boiler body lid from section top. Fire tube is isolated from remainder boiler water with cylindrical case, which defines annular water channel and provided with orifices in lower case part adapted to guide inner rotary chambers and with orifices in upper part thereof to permit water passage from the annular channel. Vertical partitions are connected between the cylindrical case and boiler body. The partitions have gaps created in lower parts thereof and adapted to permit water passage in main boiler water volume. The fire chamber is provided with intermediate emitter installed on water-cooled surface inside the fire chamber. Boiler in accordance with the second embodiment may have two cylindrical chambers. Third-pass gas-tube bundle sections are enclosed with cylindrical chamber. The third-pass gas-tube bundle sections are located in horizontal plane above main body and are connected to main boiler body in gas flow direction by outer gas rotary chambers.

EFFECT: increased operational convenience, improved performance, increased efficiency of boiler-room space usage and reduced nitrogen oxide discharge.

8 cl, 4 dwg