Unit 21 - Chapter 91 Flashcards
Before atomization can occur heavy oil are heated to
95’C
The reducing of oil into very small particles is termed
Atomization
An air atomizing burner utilizes an air pressure of
100 kPa
The capacity of a constant capacity mechanical atomizer is a function of
Orifice size
A modulating pressure atomizer has its return oil flow regulated by
Modulating valve in the return line
To which of the following oil burners is the oil supplied under high pressure?
Mechanical atomizing burner
When using mechanical fuel oil atomization
High pump pressure is required
Oil burner can be divided into three classes
- Air and steam atomizing burners
- Mechanical or pressure atomizing burners
- Centrifugal or rotary cup burners
The compressed air used as atomizing air in the oil burner is called
Primary air
The two basic varieties of mechanical atomizing oil burners
- Constant capacity burner
2. Modulating burner
A multiburner cluster has secondary and tertiary nozzles ignited by
The primary burner
When a greater than normal amount of combustible mixture is ignited by the result may be
A puff back
A fuel filter consists of
Three main parts
Burner light oil supply pressure range is approximately
550 to 700 kPa
A relief valve is placed on the discharge of a fuel oil pump
So burner design pressure is not exceeded
A time delay oil valve
Opens once ignition is verified
In order to prevent the possibility of a furnace explosion it is important that the furnace is ___ before the igniter is energized and fuel is supplied to the burner nozzles
Purged
Intermediate and high fire burner nozzles have higher capacities than the primary burner nozzle
To allow better boiler warm ups
Oil flow rate to a modulating burner is regulated by
A return line modulating valve
The minimum distance from furnace to oil storage tank is
2.1 m
Maximum static pressure in a fuel oil line is approximately
70 kPa
