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Here the steam and fuel are mixed into an emulsion and expanded in the holes before emission creating good atomisation. This design is tolerant of viscosity changes and is frugal on steam consumption and require reduced fuel pump pressures.

Related Terms

PRIMARY AIR

Air introduced with fuel at the burners.

EXCESS AIR

The amount of air needed by a burner which is in excess of the amount required for perfect or stoichiometric combustion. Some amount of excess air, depending on the available fuel/air mixing energy, is required to assure through mixing of the fuel and air for complete combustion.

GAS TIP

The part of a burner which discharges the gas fuel via one or more openings into the furnace. The size, arrangement, and angular disposition of the openings in the tip have a major effect on the size and shape of the flame.

FLAME SPEED

The rate at which a flame can propagate in a combustion mixture. If the flame is lower than the speed of the reacting flow, the flame may lift off the burner. If the flame speed is higher than the speed of the reacting flow the flame may flash back into the burner.

LOW GAS PRESSURE SWITCH

A control to stop the burner if gas pressure is too low.

FIRING RATE CONTROL

A pressure temperature or flow controller which controls the firing rate of a burner according to the deviation from pressure or temperature set point. The system may be arranged to operate the burner on-off, high-low or in proportion to load demand.

INTERMITTENT IGNITION

An igniter which burns during light off and while the main burner is firing and which is shut off with the main burner.

HEAT LIBERATION

Amount of heat released during combustion of fuels. One of the criteria for determining what burner to use in an application.

INPUT RATING

The fuel burning capacity of a burner at sea level in Btu per hour as specified by the manufacturer.

HIGH FIRE

The input rate of a burner at or near maximum.
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