Sustained ignition secondary combustion unit

F - Mech Eng,Light,Heat,Weapons – 24 – B

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F24B 5/00 (2006.01) F24B 1/02 (2006.01) F24B 5/02 (2006.01) F24B 5/04 (2006.01)

Patent

CA 1164296

Title of the Invention SUSTAINED IGNITION SECONDARY COMBUSTION UNIT Abstract of the Disclosure A sustained ignition secondary combustion apparatus in a housing of refractory insulating material includes a first level for conducting secondary air through a secondary air inlet and channel, and a second level for conducting smoke products. A partition separates the levels or zones. Openings are provided in the partition between the levels bounded by a high temperature porous or fiberlike material in the form of igniter tube elements. Secondary air and smoke products diffuse into the interstices of the porous or fiberlike material where contact and combustion maintains the igniter tubes at or above the ignition temperature. Ignition and secondary combustion of smoke products in the second level is therefore sustained and secondary air is preheated as it passes through the openings. A secondary combustion zone is defined in the region of the openings between the levels and continues down stream through the exhaust outlet. The first and second levels of the secondary combustion unit may be arranged in a variety of configurations for preheating of secondary air and primary smoke by counterflow with high temperature end products of secondary combustion. Multiple or tortuous pathways may be provided for extended preheating. Primary smoke may also be preheated by smoke preheating tubes. The invention is also applied in a downdraft furnace.

401286

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