초록 ▼

A process and apparatus for heating fluids, particularly for heating cooking oil within a deep fat fryer. A fuel-air mixture is introduced and combusted within a combustion tube, preferably of either a power burner or a pulse combustor. The flue gases are discharged from the combustion tube, into a

A process and apparatus for heating fluids, particularly for heating cooking oil within a deep fat fryer. A fuel-air mixture is introduced and combusted within a combustion tube, preferably of either a power burner or a pulse combustor. The flue gases are discharged from the combustion tube, into a plenum. A baffle arrangement is used to direct the flue gases from the plenum through a passageway, creating flue gas flow in one direction over a primary portion of an outer surface of the fluid container, and then in a counterflow direction over a secondary portion of the outer surface of the fluid container. The flue gases are then discharged from the passageway into a flue stack. According to the process and apparatus of this invention, flue gas temperatures are reduced to about 200°F.-400°F., nitrogen oxides can be reduced to 10 ppm or lower, carbon monoxide is reduced to 4 ppm or lower, and the overall thermal efficiency of the fluid heater is increased to approximately 80-85 percent.

대표청구항 ▼

A fluid heating apparatus comprising: a fluid container having a front wall, a rear wall, side walls and a bottom wall; at least one combustor each comprising a combustion tube positioned between said front wall and said rear wall, a front end plate and a rear end plate, fuel-air inlet means for adm

A fluid heating apparatus comprising: a fluid container having a front wall, a rear wall, side walls and a bottom wall; at least one combustor each comprising a combustion tube positioned between said front wall and said rear wall, a front end plate and a rear end plate, fuel-air inlet means for admitting a fuel-air mixture into said combustion tube, ignition means for igniting said fuel-air mixture, and said rear end plate having a plurality of through holes about at least a portion of a periphery of said rear end plate; a plenum adjacent said rear wall, said plenum in communication with each said combustion tube; baffle means forming a passageway for directing flue gases from said plenum in a flow over a primary portion of an outer surface of said fluid container and then in a counterflow, with respect to said flow, over a secondary portion of said outer surface; and a flue stack in communication with said passageway and a surrounding atmosphere.