Optimal value excess air should be evaluated on a case-by-case basis. It is not difficult for this individual to cover the cost of his employment. This individual spends his shift moving from furnace to furnace optimising the firing conditions – obviously in close communication with the unit operator. I know of several sites that have tried to address this by creating an additional operator position dedicated to furnace tuning. Edwin mentioned above the issue with operator priorities affecting their ability to commit time to continuous optimisation. Another is to multiply the %O 2 by the combustibles measurement, and minimise the product by adjusting the air.Ī skilled, experienced, committed operator is more important than the optimisation method, analyser type or control technology. One approach is to reduce air until the combustibles respond, then reverse the last movement on the air. The objective is to simultaneously minimise excess oxygen and combustibles. Ideally the analysers should measure conditions below the convection section due to the large amount of air leakage in a typical convection section. To get maximum benefits from optimisation, and to ensure optimisation doesn’t create safety or environmental issues, the oxygen analyser should be coupled with a combustibles analyser. In a multi-burner natural draught furnace, it is very difficult to reliably set all the registers to give equal air to each burner, hence a certain amount of sub-optimisation is almost inevitable. With a rotary nozzle type burner, the nozzle rotates at high speed and oil is supplied through the shaft.īurners on a rotary cup burner type are cone-shaped cups that rotate around a central tube where fuel is supplied.Previous answers have given various rules of thumb which are useful for design purposes or for initial screening to identify the most likely opportunities for improvements. Rotary burners operate with low gravity pressure and fuel oil is supplied and thrown from a rotating disk using a smooth spray with centrifugal force. The disadvantage of pot-type is its limited capacity. Pot-type burners are the cheapest type of fuel burners and have the lowest operating costs. Perforated sleeve type burners are only used in small applications. Forced burners rely on mechanical fans and / or chimneys for air supply. Natural draft burners rely on natural drafts in the chimney for air supply. In atmospheric pot type burners, gravity causes oil to flow into the buner. There are three types of pot-type (vaporizing) burners, namely: In pot-type (vaporizing) burners the fuel evaporates into the combustion air. This type of burner is very flexible and can be used in a variety of applications, ranging from residential heaters with small capacities to larger applications in the industry. The liquid formed in the form of microscopic particles or droplets that are mixed and partially evaporated before igniting in the combustion chamber. Gun-type (atomizing) burners will spray a liquid oil fuel oil through the nozzle and spraying it into the air stream. gun-type (atomizing ) burners (pressure gun).Types of Oil burner:įuel oil burners can in general categorized as: The atomization is assisted by the resistance, friction, and turbulence of air, for the cause of deformation and distribution of drop. The fuel mixture passes through a mixing tube and burns at the burner head.Ītomizing burner has an arrangement for atomizing of liquid fuels before the combustion takes place. In vaporizing burner the volatile fuel is passed at a low pressure through a tube adjacent to the flame, where vaporization takes place. It is essential that the oil / air mixture is well homogenized with as few pure droplets of fuel oil as possible for the efficiency of the combustion process.Ī oil burner can be under two categories: Oil burner is used to burn heating boil, diesel fuel & similar fuels.
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