Table 6 Results of proximate analysis of coal and product gas composition in UCG experiment with steam/water injection.

From: Effects of water injection on reaction temperature and hydrogen production in horizontal co-axial underground coal gasification

  

Proximate analysis of coal

Product gas

Field/ Model experiment

Calorific value (MJ/kg)

Moisture

(%)

Ash

(%)

Volatiles

(%)

Fixed carbon

(%)

H2

(%)

CO

(%)

CH4

(%)

CO2

(%)

Huang et al., 202120

(steam)

Field

24.78

8.79

6.23

26.3

58.7

25.3–32.9

26.9–29.9

3.5–3.9

27.8–31.5

Yang et al., 20083

(steam)

Field

25.96

3.66

12.6

30.3

53.4

72.87 (max)

18.6 (max)

15.08 (max)

-

Liu et al., 20094

(steam)

Model

-

32.8

10.9

24.9

44.5

43.0

25.9

3.63

-

Gür et al., 202018

(steam)

Model

-

10.0

18.3

33.7

38.0

27.2

4.38

5.38

52.1

This study

(water)

Model

24.44

4.2

22.2

34.0

39.6

21.3

17.6

1.02

20.1

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