Deck 22: Furnaces

Question 1

What characteristic of process feedstock determines the temperature?

A) Weight
B) Quality
C) Effluent analysis
D) All of the above

Answer 1

C
Explanation: A) Incorrect. The temperature is determined by process feedstock effluent analysis.
B) Incorrect. The temperature is determined by process feedstock effluent analysis.
C) Correct. The temperature is determined by process feedstock effluent analysis.
D) Incorrect. The temperature is determined by process feedstock effluent analysis.

Question 2

What is the hottest section of the furnace?

A) Damper
B) Radiant tubes
C) Firebox
D) Refractory

Answer 2

C
Explanation: A) Incorrect. The purpose of the damper is to regulate the flow of air or draft in the furnace.
B) Incorrect. Radiant tubes are tubes located in the firebox that receive heat primarily through radiant heat transfer from the burners.
C) Correct. The firebox is the combustion area. It is the hottest section of the furnace.
D) Incorrect. The refractory lining, sometimes called fire brick, is a bricklike form of insulation used inside high temperature applications.

Question 3

What improper operation can cause flashbacks?

A) Failure to wear proper protective equipment
B) Failure to follow flame safety procedure
C) Poor control of excess air and draft control
D) Opening inspection ports when the firebox has a positive pressure or pressure greater than atmospheric

Answer 3

B
Explanation: A) Incorrect. Failure to follow flame safety procedure can cause flashbacks.
B) Correct. Failure to follow flame safety procedure can cause flashbacks.
C) Incorrect. Failure to follow flame safety procedure can cause flashbacks.
D) Incorrect. Failure to follow flame safety procedure can cause flashbacks.

Question 4

What type of draft system has no fans or mechanically produced draft?

A) Forced draft
B) Natural draft
C) Balanced draft
D) Induced draft

Question 5

What process is used in the operation of furnaces when the heat is transferred through the walls of the tubes to the process fluid?

A) Convection
B) Conduction
C) Evaporation
D) Radiation

Question 6

Which of the following improper operations will not cause a loss in production due to downtime for repairs?

A) Bypassing safety interlocks
B) Failure to follow flame safety procedure
C) Poor control of excess air and draft control
D) Opening inspection ports when the firebox has a positive pressure or pressure greater than atmospheric

Question 7

What type of draft system uses fans, located at the top of the furnace, to pull air up through the furnace?

A) Forced draft
B) Natural draft
C) Balanced draft
D) Induced draft

Question 8

What is a condition in which the flames from a burner touch the tubes in the furnace?

A) Hot spots
B) Breech
C) Flame impingement
D) Furnace purge

Question 9

What section of a furnace contains the burners?

A) Radiant
B) Convection
C) Stack
D) Cabin furnace

Question 10

What provides the main source of air to the furnace?

A) Damper
B) Air register
C) Furnace purge
D) Stack

Question 11

Which of the following is a process where a furnace is used?

A) Cool water
B) Superheat steam
C) Remove chemicals from a raw material
D) All of the above

Question 12

Which factor does a furnace design depend on?

A) Tube arrangement
B) Burner arrangement
C) Whether the furnace is part of a larger process unit
D) All of the above

Question 13

What improper operation can cause burn, injuries, or death?

A) Bypassing safety interlocks
B) Failure to follow flame safety procedure
C) Poor control of excess air and draft control
D) All of the above

Question 14

What is the process called that separates the components of crude oil in order to break heavier hydrocarbon molecules into lighter hydrocarbon molecules?

A) Fracking
B) Cracking
C) Process heater
D) Fireboxing

Question 15

Which of the following should a process technician not do when monitoring and maintaining furnaces?

A) Check draft balance (pressures)
B) Check burner balance (fuel-to-air) ratios
C) Observe flame color in firebox
D) Using YouTube check for excessive vibration