Used oil furnace with vertical flue tubes

摘要

The combustion gases in a used oil furnace are discharged from the combustion chamber through an opening in the upper rear portion of the combustion chamber to direct the combustion gases into an upper header. An array of vertically oriented flue tubes extends downwardly from the upper header to a lower header before being discharged through horizontally opposing discharge openings. Ventilation air is blown into the rear of the furnace past and around the vertical flue tubes and is then forced in to a laminar path extending circumferentially around the combustion chamber by an air sweep shroud spaced from the combustion chamber by an annular gap. The ventilation air is then collected in a forward discharge chamber for discharge through louvered ventilators into the adjacent ambient atmosphere.

主权项

1. A furnace for burning petroleum products to produce heat and combustion gases, comprising:
an elongated cabinet shell having a longitudinal axis; a combustion chamber supported in said cabinet shell within which said petroleum products are burned, said combustion chamber including a front wall and a rear wall; a heat exchanger mounted within said cabinet shell to receive said combustion gases from said combustion chamber, said heat exchanger including an upper header, a lower header and an array of vertically oriented flue tubes located rearwardly of said rear wall of said combustion chamber, said heat exchanger defining a flow path for said combustion gases that flows through an exhaust port at an upper portion of said combustion chamber into said upper header, then downwardly through said array of vertically oriented flue tubes into said lower header, said cabinet shell including an access door above said upper header to permit selective access into said upper header; and a ventilation fan blowing ventilation air around said vertically oriented flue tubes to extract heat from said combustion gases, said ventilation air being discharged into the ambient atmosphere around said furnace after passing through said heat exchanger.