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NORA Oilheat Technicians Manual

Chapter 5 Nozzles and Combustion Chambers Chapter 5—Nozzles and Combustion Chambers 5-3 Proper nozzle selection is the key to efficient, clean combustion. By knowing how to determine the proper firing rate, the right spray angle, and the appropriate spray pattern, you can ensure good reliable combustion. Construction of the nozzle The oilburner nozzle is a precisely engineered product, manufactured to the very close tolerances necessary to atomize and meter fuel in the spray patterns and angles required of today’s oilheating equipment. Nozzles are made of either stainless steel or a combination of stainless steel and brass, allowing them to withstand the temperatures, pressures, and variety of fuels found in combustion environments. Nozzle function The nozzle performs three vital functions for an oilburner: 1. Atomizing: Heating oil must be vaporized to burn. Although the vaporization is actually accomplished with heat, the oil must be ‘broken down’ into tiny droplets first. This is called ‘atomization’ and allows the oil to vaporize quickly and evenly for fast and quiet ignition. See Figure 5-1. Figure 5-1: Nozzle; cutaway view Part 1: Nozzles Chapter 5 Nozzles and Chambers Measured Angle Atomized Oil Orifice Swirl Chamber Steel Orifice Disc Distributor with Tangential Slots Body Lock Nut Sintered Filter Oil Flow


NORA Oilheat Technicians Manual
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