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Flashcards in chapter 2. boiler systems Deck (23)
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1
Q

what are the 4 boiler systems

A

feedwater system
fuel system
draft system
steam system

2
Q

what does the feedwater system supplies

A

suitable water to the boiler at the temper-ature and pressure needed to sustain the steaming cycle

3
Q

what does the fuel system supplies

A

fuel in the proper condition for the combustion process.

4
Q

what does the draft system provides

A

provides air for combustion and discharges the gases of combustion into the atmosphere.

5
Q

what does the steam system does

A

controls and directs the steam to the point where its energy is used for process operations, heating, or the generation of electricity.

6
Q

Steam is

A

vapor that forms when water is heated to its boiling point

7
Q

If the pressure controls fail, what is the last resort to control pressure in the boiler

A

the safety valve

8
Q

what kind of steam contains more heat energy superheated steam or saturated steam

A

Superheated steam

9
Q

when a steam header is used

A

when multiple boilers are in battery

10
Q

Any time there is a reduction in steam pressure through a pressure-reducing station, there must be a ___to protect the devices designed to operate at the reduced pressure.

A

safety valve

11
Q

Feedwater is

A

water supplied to a boiler.

12
Q

_____protect boilers by preheating the feedwater to remove most dissolved gases.

A

Deaerators

13
Q

Water weighs approximately

A

8.3 lb/gal

14
Q

where deaerator tank is located

A

above the feedwater pumps

15
Q

Each feedwater pump has its own _____to prevent hot water from the boiler from backing up if the check valve located close to the boiler fails.

A

check valve

16
Q

what valve is closest to the boiler in the feedwater line

A

the stop valve

17
Q

in the feedwater line why the stop valve is closest to the boiler

A

so that the check valve can be repaired without draining the boiler

18
Q

A fuel system is

A

a boiler system that provides fuel for combustion to produce the heat needed to evaporate water into steam

19
Q

Natural gas leaks must be located by

A

qualified in plant personnel or a gas company representative.

20
Q

what is vaporstat

A

is a safety switch between the manual reset

valve and zero gas governor

21
Q

In a low-pressure gas system, the rate of combustion is controlled by

A

the amount of air supplied to the venturi.

22
Q

A typical high-pressure gas system is sized at about

____btu/hr to _____ Btu/hr

A

2,000,000 Btu/hr to 84,000,000 Btu/hr

23
Q

what does the gas-pressure regulator does

A

controls the gas pressure supplied to the burner