After text activity

I. Reading Exercises:

Exercise 1. Read and memorize using a dictionary:

vessel, fluid, exit, combustion chamber, immersion, nuclear fission, fire-tube boiler, boiler barrel, furnace, firebox, drum, reverse direction, storage capacity.

Exercise 2. Answer the questions:

1) How can you classify the boilers?

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?

Exercise 3. Match the left part with the right:

1. The source of heat for a boiler is	the heat rejected from other processes such as gas turbines.
2. Electric boilers use	combustion of any of several fuels.
3. Nuclear fission is also used	resistance or immersion type heating elements.
4. Heat recovery steam generators (HRSGs) use	as a heat source for generating steam.

Exercise 4. Open brackets choosing the right words:

The furnace can be situated at one end of a fire-tube which (shortens/lengthens) the path of the hot gases, thus (cutting/augmenting) the heating surface which can be further (decreased/increased) by making the gases reverse direction through a second parallel tube or a bundle of multiple tubes.

II. Speaking Exercises:

Exercise 1. Describe pot boiler; fire tube boiler; furnace; locomotive type boiler; water – tube boiler; water – tube fireboxes using the suggested words and expressions as in example:

pot boiler primitive “kettle”; fire; to heat; partially-filled water container; from below. example: a primitive “kettle” where a fire heats a partially–filled water container from below.

fire tube boiler water; partially fill; boiler barrel; small volume left above; to accommodate the steam space ; the heat source; inside a firebox; permanently surrounded by the water; to maintain the temperature; just below boiling point.

furnace enclosed chamber; heat; is produced; to heat buildings; destroy; refuse; smelt or refine ores.

Locomotive type boiler boiler barrel; to extend; from the firebox; hot gases; to pass through ;bundle of fire tubes; inside the barrel.

water – tube boiler the water tubes; are arranged; inside a furnace; in a number of configurations.

water – tube fireboxes the firebox; to contain; assembly of water tubes; the gases; to pass through; conventional fire-tube boiler.

Exercise 2. Ask questions to the given answers:

1) Question: ___________________________________?

Answer: A boiler is a closed vessel in which water or other fluid is heated.

2) Question: ___________________________________?

Answer: Construction of boilers is mainly limited to carbon steel, stainless steel, and cast iron. In live steam toys, brass is often used.

3) Question: ___________________________________?

Answer: The source of heat for a boiler is combustion of any of several fuels, such as wood, coal, oil, or natural gas.

4) Question: ___________________________________?

Answer: Heat recovery steam generators (HRSGs) use the heat rejected from other processes such as gas turbines.