Effect of High-Sintering-Temperature Reduction Behavior on Coke Solution Loss Reaction with Different Thermal Properties
Abstract
:1. Introduction
2. Experiment
2.1. Sample
2.2. Experimental Device
2.3. Experimental Methods
2.3.1. Sample
2.3.2. High-Temperature Reduction Experiment
2.3.3. Index
3. Experimental Results and Analysis
3.1. High-Temperature Reduction Behavior and Characteristics of Sinter
3.2. Behavior and Characteristics of Coke Dissolution Loss
4. Conclusions
- (1)
- From the mutual verification and analysis of non-isothermal equal conversion rate method and isothermal fitting model method, it is found that the diffusion step in the sinter reduction reaction is the limiting link in each stage of the high-temperature region. As a result, the reduction rate of sinter in the coupling reaction decreases with increasing temperature, which, in turn, affects the degradation behavior and characteristics of coke.
- (2)
- In the coupling reaction between high-reactive coke sample and sinter, the most severe dissolution rate, RCSL, is observed near 1100 °C, which is also the lowest point of the CSCSL value after the dissolution of high-reactive coke. However, in the coupling reaction between the low-reactivity coke sample and sinter, the most severe dissolution rate, RCSL, is observed near 1200 °C, which is also the lowest point of the CSCSL value after the dissolution of low-reactivity coke. Sinter reduction has different effects on the degradation of high- and low-reactivity coke.
- (3)
- In the coupling reaction between sinter and coke, the dissolution rate, RCSL, and the strength, CSCSL, of the two cokes have a good linear relationship at all temperature points and a good correlation with the coupling factor. Between sinter and coke, the temperature range with the best matching degree is the position where the coupling factor is closest to 1. The limiting link of the coupling reaction is obtained from the coupling factor, and the reason why high- and low-reaction coke can maintain their thermal performance in the high-temperature softening zone of a blast furnace due to the reduction behavior of sinter is revealed, so as to obtain a more accurate basis for evaluating and calculating the thermal performance of coke.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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TFe | FeO | SiO2 | CaO | MgO | R2 |
---|---|---|---|---|---|
56.00 | 8.40 | 5.28 | 10.10 | 1.79 | 1.91 |
Fixed C | Ash | Volatiles | S | M10 | M40 | Mt | P | |
---|---|---|---|---|---|---|---|---|
coke1 | 87.4 | 12.85 | 0.98 | 0.88 | 5.7 | 81.5 | 0.29 | 0.033 |
coke2 | 87.12 | 13.98 | 1.29 | 0.87 | 6.2 | 81.9 | 0.31 | 0.035 |
Temperature | 1050 °C | 1100 °C | 1150 °C | 1200 °C | 1250 °C |
---|---|---|---|---|---|
Rs,HT | 27.7 | 23.5 | 18.3 | 14.0 | 11.4 |
Reaction Model | Symbol | f(α) | g(α) |
---|---|---|---|
Mampel power law | M1 | 4α3/4 | α1/4 |
Mampel power law | M2 | 3α2/3 | α1/3 |
Mampel power law | M3 | 2α1/2 | α1/2 |
Avrami–Erofeev | A1 | 4 (1 − α)[−ln(1 − α)]3/4 | [−ln(1 − α)]1/4 |
Avrami–Erofeev | A2 | 3 (1 − α)[−ln(1 − α)]2/3 | [−ln(1 − α)]1/3 |
Avrami–Erofeev | A3 | 2 (1 − α)[−ln(1 − α)]1/2 | [−ln(1 − α)]1/2 |
Reaction order | R1 | 4 (1 − α)3/4 | 1 −(1 − α)1/4 |
Reaction order | R2 | 3 (1 − α)2/3 | 1 −(1 − α)1/3 |
Reaction order | R3 | 2 (1 − α)1/2 | 1 −(1 − α)1/2 |
One-dimensional diffusion | D1 | 1/2α−1 | α2 |
Ginstling–Brounshtein diffusion | D2 | 3/2 [(1 − α)1/3 −1]−1 | 1 − 2/3α − (1 − α)2/3 |
Jander diffusion | D3 | 3/2 (1 − α)2/3 [1 − (1 − α)1/3]−1 | [1 −(1 − α)1/3]2 |
g(Rs,HT) | E/kJ mol−1 | A/s−1 | R2 | |
---|---|---|---|---|
1st Stage | [1 − (1 − α)1/3]2 | 45.79 | 1.09 × 106 | 0.9858 |
2nd Stage | 1 − 2α/3 − (1 − α)2/3 | 68.67 | 9.3 × 106 | 0.9871 |
3rd Stage | α2 | 63.45 | 6.9 × 106 | 0.9998 |
T | 1050 °C | 1100 °C | 1150 °C | 1200 °C | 1250 °C | ||
---|---|---|---|---|---|---|---|
RCSL | Coke 1 | experiment | 15 | 25 | 19.5 | 15.6 | 14.3 |
sample | 17.5 | 25.4 | 20 | 16.5 | 15 | ||
Coke 2 | experiment | 11.8 | 14 | 18.5 | 24 | 15.5 | |
sample | 12 | 16 | 20 | 25 | 18 |
T | 1050 °C | 1100 °C | 1150 °C | 1200 °C | 1250 °C |
Coke 1 | 0.494 | 0.998 | 1.025 | 0.985 | 0.995 |
Coke 2 | 0.488 | 0.538 | 0.899 | 1.091 | 1.098 |
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Jin, J.; Wang, Q.; Zhang, S. Effect of High-Sintering-Temperature Reduction Behavior on Coke Solution Loss Reaction with Different Thermal Properties. Metals 2023, 13, 117. https://doi.org/10.3390/met13010117
Jin J, Wang Q, Zhang S. Effect of High-Sintering-Temperature Reduction Behavior on Coke Solution Loss Reaction with Different Thermal Properties. Metals. 2023; 13(1):117. https://doi.org/10.3390/met13010117
Chicago/Turabian StyleJin, Jin, Qi Wang, and Song Zhang. 2023. "Effect of High-Sintering-Temperature Reduction Behavior on Coke Solution Loss Reaction with Different Thermal Properties" Metals 13, no. 1: 117. https://doi.org/10.3390/met13010117