(57) The boiler disclosed consists principally in an enclosure (1) containing solid fuel
(2), which is encompassed by a baffle structure composed of vertical L-section members
(5,6) creating passages (6') that rise toward a chamber (12) where the flue gases
are gathered. The surrounding water jacket (8) receives heat from the gases as well
as from the inner wall (5) of the baffle, in which transfer occurs by way of the radially-disposed
members (6) of the L-sections. At the lower end (19) of the enclosure (1) one has
a grate (22) incorporating fire bars (23) and making contact with sub-horizontal longitudinal
hollow members (26) in which water circulates. Draughts are set up by a front-mounted
blower unit (35) from which primary air is sent upward through a port (39) and secondary
air is forced in the opposite direction, through a valve-controlled outlet (40, 41),
into the combustion chamber (24).
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