Effects of coal carbonization conditions on rate of steam gasification of char |
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| Affiliation: | 1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China;2. Xi’an Jiaotong University Suzhou Academy, Suzhou 215123, Jiangsu, China;3. Micro-optoelectronic Systems Laboratories, Xi’an Technological University, Xi’an 710032, Shaanxi, China;4. School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China |
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| Abstract: | Effects of carbonization conditions on char reactivity in steam gasification were evaluated by a gravimetric method, using 12 coals varying widely in rank, type and source. The carbonization variables examined were - 1.(1) heating rate (5–420K min−1) in steam atmosphere;
- 2.(2) gaseous atmosphere (N2,H2,H2O andCO2);
- 3.(3) incomplete devolatilization in N2 (final temperature 200–800 °C);
- 4.(4) quenching of incompletely devolatilized char; and
- 5.(5) complete carbonization (900–1400 °C).
The char reactivity to steam depended on the kind of coal but was almost independent of the carbonization conditions of heating rate, gaseous atmosphere and quenching at temperatures below ≈ 1000 °C. Carbonization above 1100 °C reduced the char reactivity, for example by a factor of 7 to 10 at 1300 °C compared with 900–1000 °C, depending on the parent coal. The char deactivation brought about by increasing carbonization temperature could be correlated with a decrease in the micropore volume of the char, unless graphitization was significant. |
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