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I. Reading Exercises:
Exercise 1. Read and memorize using a dictionary:
pressure vessel, wrought iron, live steam,formability,rivetting, cast iron, brittleness,Heat recovery steam generators (HRSGs), rejected, boiler barrel, accommodate,firebox, be kept, boiling point, augmenting, return flue boiler, 3-pass boiler, succession of coils, storage capacity,flash boiler, thermic siphons, safety valve, lap joints,faulty boiler, sludge,substandard boiler |
Exercise 2. Answer the questions:
1) Why is in live steam models, copper or brass often used?
2) What boiler types are called fire – tube boilers?
3) What boiler types are called water – tube boilers?
4) What boiler types are called water – tube fireboxes?
5) What is the source of heat for a boiler?
Exercise 3. Match the left part with the right:
1. Cast iron may be used | a) catastrophic failure of a boiler. |
2. Boiler explosions are | b) more sophisticated and larger, constructed for stationary use. |
3. Modern boilers are | c) if they are installed correctly. |
4. Good quality boilers are reliable and efficient, | d)for the heating vessel of domestic water heaters. |
Exercise 4. Open brackets choosing the right words:
A boiler (explosion/detonation) is a catastrophic failure of a boiler. As seen today, boiler explosions are of (two/three) kinds. One kind is a failure of the pressure parts of the steam and water sides. There can be many (different/various) causes, such as failure of the safety valve, corrosion of critical parts of the boiler, or (low /high) water level. Corrosion along the edges of lap joints was a (common/general) cause of early boiler explosions.
II. Speaking Exercises:
Exercise 1. Learn the definitions: Pot boiler; fire tube boiler; furnace; water – tube boiler.
"Pot boiler" "Pot boiler" or "Haycock boiler": a primitive "kettle" where a fire heats a partially-filled water container from below. |
fire tube boiler Here, water partially fills a boiler barrel with a small volume left above to accommodatethe steam (steam space). |
furnace Largecontainer for burning fuel. A large enclosed container in which you burn fuel, used for heating a building or for an industrial process such as making metal liquid. |
water – tube boiler A water tube boiler is a type of boiler in which water circulates in tubes heated externally by the fire. Fuel is burned inside the furnace, creating hot gas. |
Exercise 2. Ask questions to the given answers:
1) Question: ___________________________________?
Answer: Water-tube fireboxes were installed in many Hungarian locomotives, but have met with little success in other countries.
2) Question: ___________________________________?
Answer: The source of heat for a boiler is combustion of any of several fuels, such as wood, coal, oil, or natural gas.
3) Question: ___________________________________?
Answer: Heat recovery steam generators (HRSGs) use the heat rejected from other processes such as gas turbines.
III. Writing exercises:
Exercise 1. Complete the sentences with the suggested words:
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Boiler installation of small capacity | | | Lesson 11 |