The Influence of Hydrogen Injection on the Reduction …
155
Thermodynamics of the Reduction of Wustite
by Hydrogenation
On the basis of the above conditions, the same method was used to study the influence
of different amounts of hydrogen injection on carbon reduction of Wustite. The
reaction heat required for carbon reduction Wustite is provided by the combustion
of pulverized coal and hydrogen. The heating ratio of the two reactions is shown in
Table 4, the carbon combustion ratio is always kept at 0.35:0.65.
It can be observed from Fig. 4 that the reduction degree is slightly affected by
the pressure, and the change curves under different pressures are almost overlapped,
which is consistent with the results in Fig. 3, but the reduction degree is significantly
affected by the amount of hydrogen injection, and its change trend is divided into
two stages: before point E, reduction degree does not change with the amount of
hydrogen injection, and the reduction degree is always maintained at 100%; from
point E to point S, the reduction degree decreases with the increase of the amount
Table 4 The distribution of heating ratio of the hydrogen combustion and carbon combustion
Num
H 2 :C/%
Num
H 2 :C/%
Num
H 2 :C/%
A
5: 95
H
40: 60
O
75: 25
B
10: 90
I
45: 55
P
80: 20
C
15: 85
J
50: 50
Q
85: 15
D
20: 80
K
55: 45
R
90: 10
E
25: 75
L
60: 40
S
95: 5
F
30: 70
M
65: 35
–
–
G
35: 65
N
70: 30
–
–
Fig. 4 Reduction degree
versus combustion ratio
under different pressure.
(Color figure online)
A B C D E F G H I J K L M N O P Q R S -0.75
0.80
0.85
0.90
0.95
1.00
Reduction degree
Heating ratio
3.5bar
3.6bar
3.7bar
3.8bar
3.9bar
4.0bar
0
100%
e
FeO
FeO
n
R
n
155
Thermodynamics of the Reduction of Wustite
by Hydrogenation
On the basis of the above conditions, the same method was used to study the influence
of different amounts of hydrogen injection on carbon reduction of Wustite. The
reaction heat required for carbon reduction Wustite is provided by the combustion
of pulverized coal and hydrogen. The heating ratio of the two reactions is shown in
Table 4, the carbon combustion ratio is always kept at 0.35:0.65.
It can be observed from Fig. 4 that the reduction degree is slightly affected by
the pressure, and the change curves under different pressures are almost overlapped,
which is consistent with the results in Fig. 3, but the reduction degree is significantly
affected by the amount of hydrogen injection, and its change trend is divided into
two stages: before point E, reduction degree does not change with the amount of
hydrogen injection, and the reduction degree is always maintained at 100%; from
point E to point S, the reduction degree decreases with the increase of the amount
Table 4 The distribution of heating ratio of the hydrogen combustion and carbon combustion
Num
H 2 :C/%
Num
H 2 :C/%
Num
H 2 :C/%
A
5: 95
H
40: 60
O
75: 25
B
10: 90
I
45: 55
P
80: 20
C
15: 85
J
50: 50
Q
85: 15
D
20: 80
K
55: 45
R
90: 10
E
25: 75
L
60: 40
S
95: 5
F
30: 70
M
65: 35
–
–
G
35: 65
N
70: 30
–
–
Fig. 4 Reduction degree
versus combustion ratio
under different pressure.
(Color figure online)
A B C D E F G H I J K L M N O P Q R S -0.75
0.80
0.85
0.90
0.95
1.00
Reduction degree
Heating ratio
3.5bar
3.6bar
3.7bar
3.8bar
3.9bar
4.0bar
0
100%
e
FeO
FeO
n
R
n