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Gas > 3 Combustion > Flashcards

3 Combustion Flashcards

1
Q

Complete combustion

A

CH4+2O2+Ignition = HEAT+CO2+2H2O

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2
Q

Air required for 1m3

A

10m3

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3
Q

Oxygen required for 1m3

A

2m3

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4
Q

Relative density

A

0.6

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5
Q

Calorific value

A

38.76 MJ/m3

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6
Q

Wobbe number

A

45.5 to 55.0
CV/ RD/ Injector/ Pressure

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7
Q

Gas rate is dependent on (2)

A

-Supply pressure
-Injector(s)

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8
Q

NG Flame speed

A

0.36 m/s

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9
Q

Flammability limits

A

5 - 15%

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10
Q

Ignition temp

A

704°

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11
Q

Types of burner (2)

A

-Atmospheric
-Force draught

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12
Q

Aerated burner (Air)

A

50 - 50
Primary - Secondary air

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13
Q

Stops dust / lint particles

A

Lint arrester

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14
Q

Causes pale pink to bright orange flame picture

A

Nebuliser

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15
Q

Explosion occurrence (3)

A

-On its own
-Following a fire
-Followed by a fire

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16
Q

Gas detector location

A

Max 5m from appliance
Max 300mm from ceiling

17
Q

CO symptoms (6)

A

Severe headache, nausea, dizziness, tiredness, general body weakness or cherry red face

18
Q

CO / CO2 Room limits set by World Health Organisation

A

CO 10PPM
CO2 5000PPM

19
Q

Flue gas BS number

A

BS EN 50379-3

20
Q

Cooker grill FGA probe

A

Multi hole

21
Q

Flueless fire FGA probe

A

Bent multihole

22
Q

FGA probe positioning

A

200mm into secondary flue

23
Q

26-9 Checks

A

FAGS

24
Q

Type A Appliance

A

Flueless

25
Q

Type B Appliance

A

Open flued

26
Q

Type C Appliance

A

Room sealed

27
Q

Back boiler ratio with and without fire

A

0.008 w/o
0.020

28
Q

Boiler ratio

A

0.004

29
Q

Flueless cooker ratio

A

0.010 CE marked
0.020 No marking

30
Q

CO alarm BS number

A

BS EN 50291-1:2018

31
Q

CO alarm location (3)

A

300mm away from wall
150mm away from ceiling
1-3m from the appliance

32
Q

Perfect combustion

A

Stoichiometric.

33
Q

1st Gas family

A

Towns Gas/ manufactured

34
Q

2nd Gas family

A

Natural gas

35
Q

3rd Gas family

A

LPG

Gas (5 decks)

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