PL418103A1 - Bottom combustion central heating boiler, fired with wood, preferably for cooperation with a liquid buffer tank - Google Patents

Abstract

The subject of the application is a wood-fired central boiler of lower combustion, especially for high-temperature charging of thermal energy accumulators - liquid buffers. It is made of thermally insulated steel sheet forming parts of a water jacket (2), a large fuel chamber casing (18) with a preliminary combustion chamber (5) placed at its bottom, a ceramic combustion chamber (12), liquid-cooled flue gas channels (31) and smoke pipe (23). In the initial combustion chamber (5), incomplete combustion occurs in the gasification zone (14), with primary air shortage. Afterburning of wood gas takes place in a ceramic combustion chamber (12), with an excess of secondary air heated in the frame (11) from the grate (10). When using a circulating pump, the boiler is equipped with an additional small heating liquid circuit, consisting of a pipe (27) with a throttle valve (28). With thermogravity feed, the pipe (27) is connected to the back of the boiler to the central heating system. Thanks to this, more intense heat removal from flue gases before their outflow to the flue is obtained, while maintaining the temperature of the heating liquid and the walls of the heating boiler above the dew point. The notification ensures high thermal efficiency of the boiler, full high-temperature buffer loading and maximum thermal stratification in the buffer.