| 摘要 |
A powered downdraft type combustion unit which substantially completely gasifies the fuel burned therein during the combustion process and produces a maximum amount of usable heat for utilization at a location remote from the combustion unit is provided. The present combustion unit includes a heavily insulated outer shroud enclosing insulated sequential combustion chambers to prevent heat loss from the combustion chambers. A primary combustion chamber is separated from a secondary combustion chamber by a plurality of refractory grates. Fuel is fed to the primary combustion chamber to be combusted therein, and the products of this stage of combustion then pass to the secondary combustion chamber where the combustion process is completed. The heat-containing combustion gases are directed from the secondary combustion chamber to a heat utilizing appliance through a conduit connected therebetween. Sufficient oxygen to assure complete combustion is provided by multiple air inlets in both combustion chambers and draft inducing means which assures the maintenance of a positive flow of air through the unit. In a preferred embodiment of the present invention the fuel feed into the primary combustion chamber is sealed, and the primary and secondary combustion chambers are all positioned in the same horizontal plane so that the cross-flow of air and combustion gases is achieved through the unit. The present combustion unit efficiently burns low quality fuels to produce a maximum amount of heat which may be utilized for many purposes.
|
