Influence of Coal Reactivity on Carbon Composite Briquette …
79
Fig. 2 Solid flowing path for simulation: a illustration of the path in BF, and b change of BF
variables along the path. (Color figure online)
(1.5m 0 T Fe /M Fe ), the CCB carbon conversion by 1.0−(4π
d/2
0
ρ C r
2 dr)/m C,0 , the
CO generation rate of CCB by 4π
d/2
0
(2R 4 − R 1 − R 2 − R 3 )r
2 dr, and the CO 2
generation rate of CCB by 4π
d/2
0
(R 1 + R 2 + R 3 − R 4 )r
2 dr.
Results and Discussion
Development CCB Reaction in BF
The CCB prepared in the previous research [6] was employed as a base sample
(sample A) in the present research. Sample A had a diameter of d = 0.015 m and
a mass of m = 4.8 g. Its chemical composition is given in Table 2. Sample A was
prepared using cold briquetting followed by heat treatment, therefore, volatile in
sample A was negligible. For sample A, α gs = 1500 m
2 · m
-3 , and E c kJ/mol. The
values of α gs and E c here were validated by experiments [6]. By modeling, the
development of the reaction of sample A in BF was elucidated, and the results are
shown in Fig. 3.
Figure 3a is the curves of CCB reduction fraction and CCB carbon conversion
along the path, Fig. 3b is the curves of CO and CO 2 generating rates in CCB along
the path, and Fig. 3c is the curve of the CCB mass-loss degree along the path.
From Fig. 3, the reaction development of sample A along the path is assumed to
Table 2 Chemical composition of CCB (wt%)
Carbon
Fe 3 O 4
FeO
Metallic iron
Gangue (SiO 2 , CaO, Al 2 O 3 , …)
Total iron
20.30
29.70
39.70
1.57
8.73
54.00
79
Fig. 2 Solid flowing path for simulation: a illustration of the path in BF, and b change of BF
variables along the path. (Color figure online)
(1.5m 0 T Fe /M Fe ), the CCB carbon conversion by 1.0−(4π
d/2
0
ρ C r
2 dr)/m C,0 , the
CO generation rate of CCB by 4π
d/2
0
(2R 4 − R 1 − R 2 − R 3 )r
2 dr, and the CO 2
generation rate of CCB by 4π
d/2
0
(R 1 + R 2 + R 3 − R 4 )r
2 dr.
Results and Discussion
Development CCB Reaction in BF
The CCB prepared in the previous research [6] was employed as a base sample
(sample A) in the present research. Sample A had a diameter of d = 0.015 m and
a mass of m = 4.8 g. Its chemical composition is given in Table 2. Sample A was
prepared using cold briquetting followed by heat treatment, therefore, volatile in
sample A was negligible. For sample A, α gs = 1500 m
2 · m
-3 , and E c kJ/mol. The
values of α gs and E c here were validated by experiments [6]. By modeling, the
development of the reaction of sample A in BF was elucidated, and the results are
shown in Fig. 3.
Figure 3a is the curves of CCB reduction fraction and CCB carbon conversion
along the path, Fig. 3b is the curves of CO and CO 2 generating rates in CCB along
the path, and Fig. 3c is the curve of the CCB mass-loss degree along the path.
From Fig. 3, the reaction development of sample A along the path is assumed to
Table 2 Chemical composition of CCB (wt%)
Carbon
Fe 3 O 4
FeO
Metallic iron
Gangue (SiO 2 , CaO, Al 2 O 3 , …)
Total iron
20.30
29.70
39.70
1.57
8.73
54.00