WATER-HEATING BOILER Russian patent published in 2002 - IPC

FIELD: water heating; applicable in systems of autonomous heat supply. SUBSTANCE: water-heating boiler has a chamber furnace with fire grate, vertical secondary combustion space which consists of two coaxial shells with a built-in tube convective bundle, system of furnace cooling and heating of heat-carrier and front loading door. Furnace cooling system is made in the form of mono- and multipass tube plate suspended with the help of branch pipe from secondary combustion space. The boiler is provided with an additional rear loading device, system of flue gases recirculation with a slot ejecting withdrawal, system of low-grade organic fuels supply and stand-by electric heating of heat carrier. EFFECT: increased heat and ecological efficiency of boiler operation. 1 dwg