Boiler Basics: 18 flashcards
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1. What is the primary function of a boiler?
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To convert water into steam by applying heat energy, typically from combustion of fuel.
2. Name the two main circuits in a boiler system.
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The **water/steam circuit** and the **flue gas/air circuit**.
3. What is the role of the furnace in a boiler?
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It is the enclosed space where fuel combustion occurs, releasing heat energy.
4. What is the function of the water wall (or water tubes) in a boiler?
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They absorb heat from the combustion gases and transfer it to the water, promoting steam generation.
5. What is the purpose of the steam drum in a boiler?
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It separates steam from water, provides a reservoir for water, and helps maintain steam quality.
6. What is the function of the mud drum (or lower drum) in a boiler?
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It collects sediments, sludge, and impurities from the water, which can be blown down.
7. What is the purpose of the superheater?
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It raises the temperature of saturated steam above its boiling point, increasing its enthalpy and efficiency.
8. What is the function of the economizer?
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It preheats the feed water using the heat from the flue gases, improving overall boiler efficiency.
9. What is the role of the air preheater?
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It heats the combustion air using flue gas heat, improving combustion and efficiency.
10. What is the purpose of the burner in a boiler?
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It mixes fuel and air in the correct proportion and ignites the mixture to produce a stable flame.
11. What is the function of the feed water pump?
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It supplies water to the boiler at a pressure higher than the boiler's operating pressure.
12. What is the purpose of the safety valve in a boiler?
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It automatically releases steam if the pressure exceeds the safe limit, preventing explosions.
13. What is the function of the water level gauge (or sight glass)?
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It indicates the water level inside the boiler drum, allowing operators to monitor and control it.
14. What is the purpose of the blowdown valve?
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It allows removal of concentrated impurities, sludge, and sediments from the boiler water to maintain water quality.
15. What is the function of the draft system in a boiler?
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It maintains the flow of air and flue gases through the boiler, ensuring proper combustion and exhaust.
16. What is the purpose of the soot blower?
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It cleans the heat transfer surfaces (tubes) by blowing steam or air to remove soot and ash deposits, maintaining efficiency.
17. What is the function of the steam trap?
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It removes condensate and non-condensable gases from steam lines while preventing steam loss.
18. What is the principle of natural circulation in a boiler?
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It relies on the density difference between hot water (less dense) and cooler water (more dense) to create circulation without a pump.
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