1. |
Ideally, combustion breaks down the molecular structure of the fuel; the carbon oxidizes to carbon dioxide (CO2) and the hydrogen to ________ . |
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H2S |
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H2O |
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H2 |
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H2K |
2. |
Controlling excess air is the most important tool for managing the energy efficiency and atmospheric emissions of a boiler system. |
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True |
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False |
3. |
Which of the following is not a type of air and fuel control? |
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Mechanical jackshaft controls |
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Cross-limiting controls |
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Bucket control |
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On-Off and high-low controls |
4. |
Emissions of sulphur dioxide (SO2) and nitrogen oxides (NOx) contribute to acid rain. |
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True |
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False |
5. |
Except for natural gas, practically every fuel leaves a certain amount of deposit on the fireside of the tubes. This is called __________ , and it reduces heat transfer dramatically. |
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Fueling |
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Fouling |
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Caking |
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Damaging |
6. |
The heat exhausted from one part of the process can be used to heat another. This process is called _____________ ? |
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Heat cascading |
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Heat controlling |
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Heat management |
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None of the above |
7. |
A CHP unit typically consists of a prime mover, such as a gas turbine or piston engine, and a heat recovery steam generator, which is a type of boiler. What is CHP? |
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Combined Hot air production |
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Combined heat production |
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Combined heat and power generation |
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Controlled Heat production |
8. |
Heat exchangers can be used for preheating boiler feed water called economizers. Economizers typically increase the overall boiler efficiency by ________ percent. |
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4 to 5 |
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3 to 4 |
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3 to 6 |
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2 to 6 |
9. |
Ongoing water evaporation in steam boilers and fresh boiler makeup water increases the concentration of these minerals and leads to scale formation. To prevent this, boiler water must be _________ periodically. |
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Shut down |
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Hone down |
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Blown down |
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Run down |
10. |
Large boilers and those burning fuels with a high fouling tendency have soot blower systems that clean the fireside surfaces while the boiler is operating. |
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True |
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False |
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