Patent ID: 8176882
Filing Date: 2012-05-15
Classification: F23B

Abstract:
1. Boiler for combustion of solid fuel, comprising: a boiler wall and a boiler cover, a first combustion stage with a combustions site, a primary air supply means, an ignition means, a fuel supply means for conveyance of fuel to the combustion site, a second combustion stage with a burn-up and calcination space, a combustion chamber which is upwardly open, and a flue, wherein the burn-up and calcination space is located below the combustion site such that fuel is movable from the combustion site into the burn-up and calcination space, wherein the combustion site and the burn-up and calcination space are located jointly in the combustion chamber, wherein the flue adjoins the top of the combustion chamber so that the flue gases which are formed in the burn-up and calcination space burn up together with the flue gases which form over the combustion site in the flue, wherein the primary air supply means is located within the combustion chamber and above the combustion site so as to blow air into the first combustion stage, and wherein a flow path for the flue gases of the second combustion stage, which form when the fuels burn up or calcine in the burn-up and calcination space, is provided that routes the flue gases of the second combustion stage essentially past the primary air supply means and the combustion site so that the flue gases of the second combustion stage do not adversely affect the combustion of the fuel at the combustion site.