Chapter 92- Gas Burners For Heating Boilers

Question 1

Gas is already in a vapour state, so further vaporization or atomization isn’t necessary so what does the gas burner accomplish

Answer 1

It provides a complete and turbulent mixing of gas and combustion air

Question 2

There are two classifications of gas burners what are they

Answer 2

Pre mix burner

After- mix burner

Question 3

Define a premix burner

Answer 3

Combustion air is mixed with gas inside the burner

Question 4

Define an after mix burner

Answer 4

Combustion air is mixed with the gas after it leaves the burner

Question 5

Is a atmospheric burner a pre mix or after mix burner

Answer 5

Pre mix

Question 6

The pre mix percentage in an atmospheric affects what

Answer 6

Increased air entering the nozzle shortens the flame giving it an inner green color. because of faster burning, if air is too high the flame may retreat back into the tube.

Question 7

Burner heads maybe

Answer 7

A variety of shapes and sizes depending on there application

Question 8

What is the most common type of burner head?

Answer 8

The rectangle type used in heating boilers

Question 9

What is the most common application of a refractory type burner

Answer 9

Fire tube boilers

Question 10

A major advantage of a refractory burner

Answer 10

Air and fuel are preheated raising efficiency and lowering the need for excess air

Question 11

Disadvantage of a refractory burner

Answer 11

More complex, higher cost

Question 12

Ring burner pre mix or after mix

Answer 12

After mix

Question 13

What do deflector rings in a ring burner accomplish?

Answer 13

Provide intimate mixing of the air and fuel

Question 14

Advantage of natural gas

Answer 14

Storage is not required for fuel as it is pipelined in

Question 15

Disadvantage of natural gas

Answer 15

If interruption in the gas supply occurs then the plant will shut down

Question 16

An atmospheric burner has air entering around the burner, which is termed

Answer 16

Secondary air

Question 17

The amount of premix air to an atmospheric burner should be

Answer 17

30- 40%

Question 18

A refractory burner disadvantage is

Answer 18

High initial cost

Question 19

A very common packaged oil has burner is the

Answer 19

Ring burner

Question 20

An atmospheric burner head which is very popular on heating boilers Is the

Answer 20

Rectangular burner

Question 21

Atmospheric burners are used for

Answer 21

Gas stoves
Hot water heaters
Heating furnaces

Question 22

An intermittent pilot

Answer 22

Lights the main flame and remains on with it

Question 23

A continuous pilot is also known as a __________ pilot

Answer 23

Standing

Question 24

What type of pilot lights the main burner and then shuts off?

Answer 24

Interrupted

Question 25

An example of the after mix burner is the

Answer 25

Ring burner

Question 26

A hydra motor valve

Answer 26

Is slow to open and quick to close

Question 27

A solenoid gas fuel valve

Answer 27

Is held closed by fuel pressure

Question 28

Diaphragm gas valves use________ to open the valve

Answer 28

Gas pressure

Question 29

What type of gas valves incorporates a relay coil and a gas bleed port

Answer 29

A diaphragm gas valve

Question 30

Larger solenoid type oil and gas valves usually delayed opening to prevent

Answer 30

Puff back