MCQ on Boiler Types and Opportunities for Energy Efficiency Course | energy university schenider electric

What are the two primary designs of boiler layouts?

  • Condensing boiler and system boiler
  • Longitudinal drum and cross drum
  • Fire tube and water tube
  • None of these answers

Which of the following is an advantage of fire tube boilers?

  • Relatively inexpensive
  • Easy to clean
  • Compact in size
  • All of these answers

Which of the following is an advantage of water tube boilers?

  • Cost
  • Ease of cleaning
  • Large steam output capabilities
  • Ability to replace tubes

Which of the following is an advantage of condensing boilers?

  • Increased condensate recovery
  • Lower needs for water treatment
  • Heat recovery from water in flue gases
  • Ability to replace tubes

Low pH is a problem in boilers because acids attack metal surfaces. High pH is not a problem because alkalines do not cause any adverse effects.

  • True
  • False

Which of the following is NOT a common water impurity?

  • Suspended solids
  • Dissolved solids
  • Dissolved gases
  • Substances that cause foam or scum
  • None of these answers

What is the purpose of blowdown?

  • To eliminate impurities that accumulate in boiler water with evaporation
  • To clean scale off the boiler tubes
  • To eliminate impurities from the boiler feedwater tank
  • To release steam contaminated with impurities
  • All of these answers

A "bottom blowdown" removes "mud" and sludge from the bottom of the boiler.

  • True
  • False

A ______________ boiler blowdown uses a calibrated valve and a blowdown tap near the boiler water surface to draw water from the boiler at a predetermined rate

  • Manual
  • Continuous
  • Automatic
  • All of the above

Which of the following are examples of energy efficiency measures that can be taken in order to save on boiler operational running costs?

  • Variable speed drives
  • Pre-heating combustion air by recovering heat from flue gases
  • Heat recovery from surface water blowdown
  • Pre-heating feedwater by recovering heat from flue gases using an economiser
  • All of the above

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At the completion of this course you will be able to
  • Discuss the main types of steam and hot-water boilers
  • Explain the importance of water treatment
  • Describe the purpose of blowdown and its main methods
  • List actions that can improve the energy efficiency of boiler systems

Summary of Boiler Types and Opportunities for Energy Efficiency Course

There are two primary configurations of steam boilers: fire tube and water tube. Boilers for generating hot water are the firetube type.

Water treatment is vital to prevent scale and corrosion and (in steam boilers) embrittlement and carry over.

MCQ on Boiler Types and Opportunities for Energy Efficiency Course  | energy university schenider electric

Solids may be removed by “top” or “bottom” blowdown.
Bottom and top blowdown can be triggered manually.
Top blowdown can be done by continuously drawing water near the top.
Automatic systems monitor the build up of contamination and initiate blowdown when required.
To reduce the energy consumption of boilers
Match capacity to demand, using a small boiler for periods of low demand, such as in the summer Use a sequence controller to ensure the minimum number of boilers is fired at any time
Insulate the boiler and all piping and tanks
Maximise the recovery of hot condensate
Supply the correct amount of combustion air
Keep boilers free of fireside fouling and scale by cleaning
Minimise waterside scaling by treating feedwater correctly
Reduce heat loss by keeping blowdown to a minimum
Preheat combustion air using flue gases, air from the top of the boiler house, or air drawn over the boiler
Preheat feedwater using flue gases or heat recovered from top blowdown
Use a variable speed drive on the combustion air fan
If steam demand is irregular with occasional high peaks, consider using a steam accumulator and thereby
enable a smaller boiler to be used.
Consider replacing old inefficient boilers
In domestic and light commercial heating applications, consider a condensing boiler
Ensure boilers and piping are well insulated

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