| 摘要 |
Presented is a method and apparatus for incorporating an incandescent filter for products of combustion in the combustion chamber of a furnace including a grate and an exit slot for products of combustion located above the level of the grate. Incandescent coals from the fuel being burned obstruct the exit slot, and products of combustion must pass through the incandescent coals. In one aspect, water tubes line the walls of the combustion chamber, primary combustion air is admitted between the tubes, and the admission of secondary air is controlled to maintain an incandescent bed of coals through which products of combustion must be drawn to exit the furnace. In another aspect, a reciprocating grate is provided, and primary combustion air penetrates the bed of fuel from below. Products of combustion pass back through a portion of the burning fuel maintained at incandescence by the admission of secondary air upwardly through the reciprocating grate. In yet another aspect, low ash or no ash fuel is placed on top of a bed of crushed fire brick supported on a grate through which primary combustion air passes upwardly. Carbon particles from primary combustion collect on the crushed fire brick, and are ignited to form a relatively thick bed of incandescent material to oxidize products of combustion emanating from the primary combustion zone.
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