Question

solid fuel have high calorific value than the gaseous and liquid fuel or not

Answer 1

By custom the basic calorific value for solid and liquid fuels is the gross calorific value at constant volume and for gaseous fuels it is the gross calorific value at constant pressure. The word ‘gross’ here signifies that the water formed and liberated during combustion is in the liquid phase. The values given are approximate because many of the substances listed are not well defined. The calorific values of pure substances can be calculated from information in Section 3.10. More detailed information on technical fuels can be found in J. W. Rose and J. R. Cooper (eds) (1977) Technical Data on Fuel, 7th edn, British National Committee, World Energy Conference, London

Answer 2

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3.11.4    Calorific values of solid, liquid and gaseous fuels

By custom the basic calorific value for solid and liquid fuels is the gross calorific value at constant volume and for gaseous fuels it is the gross calorific value at constant pressure. The word ‘gross’ here signifies that the water formed and liberated during combustion is in the liquid phase. The values given are approximate because many of the substances listed are not well defined. The calorific values of pure substances can be calculated from information in Section 3.10. More detailed information on technical fuels can be found in J. W. Rose and J. R. Cooper (eds) (1977) Technical Data on Fuel, 7th edn, British National Committee, World Energy Conference, London.

Calorific values of solid, liquid and gaseous fuels

Solid and liquid fuels

Gross calorific value/ MJ kg−1

Alcohols
Ethanol


30

Methanol

23

  

Coal and coal products
Anthracite (4% water)


36

Coal tar fuels

36–41

General purpose coal (5–10% water)

32–42

High-volatile coking coals (4% water)

35

Low temperature coke (15% water)

26

Medium-volatile coking coal (1% water)

37

Steam coal (1% water)

36

  

Peat
Peat (20% water)

16

  

Petroleum and petroleum products
Diesel fuel

46

Gas oil

46

Heavy fuel oil

43

Kerosine

47

Light distillate

48

Light fuel oil

44

Medium fuel oil

43

Petrol

44.8–46.9

  

Wood
Wood (15% water)

16

  

Gaseous fuels at 15 °C, 101.325 kPa, dry

Gross calorific value/MJ m− 3

Coal gas coke oven (debenzolized)

  20

Coal gas continuous vertical retort (steaming)

  18

Coal gas low temperature

  34

Commercial butane

118

Commercial propane

  94

North Sea gas natural

  39

Producer gas coal

    6

Producer gas coke

    5

Water gas carburetted

  19

Water gas blue

  11