Nozzles & Combustion Chambers

Question 1

What material are nozzles made from and why?

Answer 1

Stainless steel or combination of stainless steel and brass. To withstand pressure,tempeture and a variety of fuels in combustion environments .

Question 2

What are the three vital functions a nozzle does for an oil burner?

Answer 2

Atomizing
Metering
Pattering

Question 3

What PSI is a typical nozzle rated for?

Answer 3

100 PSI

Question 4

What are the three spray patterns of a nozzle?

Answer 4

Hollow, solid,semi solid

Question 5

Hollow nozzle?

Answer 5

Most droplets at outer edge with no droplets in center. Used on low firing rate burners.

Question 6

Solid nozzle?

Answer 6

Droplets are more

Uniform. Best where long fires are required.

Question 7

Semi solid nozzle?

Answer 7

Has a small solid center and outer droplets.

Question 8

How we determine flow rate?

Answer 8

Smallest firing rate that will adequately heat the building on the coldest day of the year

Question 9

What nozzle should be used for burners with flow rates up to 2 PSI?

Answer 9

Hollow

Question 10

What nozzle should be used with burners with flow rates between 2-3GPH?

Answer 10

Hollow or solid pending on burner air.

Question 11

What nozzle should be used with burners with firing rates above 3 GPH?

Answer 11

Solid

Question 12

What is coking of a nozzle?

Answer 12

Over heating of nozzle. Air tube to close to chamber causes nozzle to overheat.

Question 13

How do we deal with cold oil in affects with nozzle problems?

Answer 13

Install oil line heater or increase pump pressure to decrease droplet size and better define spray angle.

Question 14

How would a nozzle get hot?

Answer 14

• bad draft
• old brick chamber
• after drip
• retention head to far into chamber

Question 15

How to you fix overheating of a nozzle?

Answer 15

• post purge
• draft inducer
• interrupted ignition
• ceramic chamber liners
• end cone amulets

Question 16

What causes nozzle afterdrip?

Answer 16

• defective pump shutoff valve
• air in nozzle line
• oil expansion in nozzle line

Question 17

Where is the flame from the oil burner contained?

Answer 17

Combustion chamber

Question 18

What are the five common types of construction of combustion chambers?

Answer 18

• insulating fire brick
• common or hard fire brick
• metal for chambers
• ceramic
• molded

Question 19

What are the chamber shapes and which one is better and why?

Answer 19

Round oval and square. Round oval is better due to the hot gases can sweep back and forth smoothly. In rectangular eddy currents developed in corners requiring more
Air.