F - Mech Eng,Light,Heat,Weapons – 23 – C
Patent
F - Mech Eng,Light,Heat,Weapons
23
C
F23C 10/28 (2006.01) C03B 5/00 (2006.01) C03B 5/02 (2006.01) F23C 10/00 (2006.01) F23C 10/20 (2006.01) F23J 3/06 (2006.01) F27B 15/00 (2006.01)
Patent
CA 2081956
Apparatus for reburning ash material of a pre- viously burned primary fuel includes a reburn combustion vessel having an inlet for receiving ash material from a primary combustion unit such as a boiler or furnace and an outlet for discharging the products of combustion from the vessel produced from burning the ash material. The outlet of the ash reburn vessel is connected to the primary combustion unit at an elevated height above the firing level. The reburned ash material moves in a com- bustion path or loop that is in parallel with at least a portion of the combustion path of the primary fuel in the primary combustion unit. A floor is provided in the ash reburn vessel for supporting a discrete bubbling bed of burning ash material and the floor includes a plural- ity of spaced apart openings distributed relatively uni- formly over substantially all of the area of the floor. Combustion air is introduced into the reburn vessel at a relatively low velocity to provide a source of underfire combustion air for the bubbling bed. Combustion air is also introduced at an upper level in the vessel above the bubbling bed to provide an overfire source of com- bustion for the upwardly moving unburned components of ash material carried along with the products of combus- tion rising out of the bubbling bed. The bubbling bed includes an air injector assembly in each of the floor openings comprising a central conduit that is open at its upper end above the level of the floor and a bubble cap is mounted over the end of the conduit for directing incoming combustion air downwardly towards the adjacent floor to form gas bubbles that tend to float or rise upwardly in the burning bed of ash material of the bub- bling bed. A control system is provided for sensing the temperature of the products of combustion of the reburn vessel and for sensing the height of the discrete bub- bling bed of burning ash material above the floor so that the flow of combustion air is selectively control- lable in response to the sensory inputs.
Riley Stoker Corporation
Smart & Biggar
LandOfFree
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