Patent ID: 8459192

Claim:
A device for gasification and combustion of solid fuel, the device comprising: an enclosure formed by walls; a partition dividing the enclosure into an upper space and a lower space, the partition having a hole which provides essentially the only passage for gas to flow from the lower space to the upper space; a reactor tube projecting into the upper space and spaced from the walls of the enclosure, thereby enabling optimum gasification of fuel in the reactor tube and minimizing surface temperatures of the device, the reactor tube having an open upper end in the upper space and an open lower end supported by the partition over the hole; a grate located in the lower space below the hole; a primary air inlet arrangement for feeding air into the lower space for gasification of solid fuel on the grate; a combustion tube having an open inlet end communicating with the upper space and an open exhaust end outside the enclosure; and a secondary air inlet arrangement for directing a stream of air toward the inlet end of the combustion tube, whereby product gas formed by gasification of solid fuel on the grate and passing through the reactor tube into the upper space will be drawn into the combustion tube to create a sub-atmospheric pressure in the upper space.