F - Mech Eng,Light,Heat,Weapons – 23 – G
Patent
F - Mech Eng,Light,Heat,Weapons
23
G
110/7
F23G 5/00 (2006.01) F23G 5/50 (2006.01) F23G 7/00 (2006.01) F23N 1/02 (2006.01) F23N 5/00 (2006.01)
Patent
CA 1212276
THE ABSTRACT OF THE DISCLOSURE The present invention relates to a method and apparatus for controlling the operation of a multiple hearth furnace system for efficiently incinerating combustible materials, such as sludge in which the air of combustion is essentially all introduced at the bottom of the furnace to incinerate solid materials. This control involves the following essential steps: scanning the temperature of two or more combustion hearths to determine which is the hottest hearth; controlling the temperature of the thus-determined hottest hearth at a predetermined temperature set point value; controlling the oxygen content of the system exhaust gas at least as high as the predetermined set point value; and maintaining the system exhaust temperature at least as high as the predetermined set point value. The above controls are effected for modulating one or more operations consisting of controlling the combustion air flow to the bottom of the furnace, controlling the firing rate of the burner on the burner hearth or hearths above and/or below the thus-determined hottest temperature hearth and controlling the flow of afterburner air to the exhaust system in the case of operating the furnace system in the pyrolysis mode. The present invention contemplates two modes of operation of the furnace system, i.e., the pyrolysis or excess air mode of combusting the combustible materials. By this procedure and apparatus, it is possible to control the temperature profile of the furnace so as to operate under optimum conditions and to control the throughput or the feed rate of the combustible material, such as sludge, to the furnace on a more predictable and constant basis, since the hottest hearth is always known and its temperature maintained at a predetermined temperature value.
447270
Fetherstonhaugh & Co.
Zimpro
LandOfFree
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