التفاصيل البيبلوغرافية
| العنوان: |
Theoretical and experimental investigation on the effect of CO on N migration and conversion during air-staged coal combustion. |
| المؤلفون: |
Chen, Ping, Wang, Peipei, Gu, Mingyan, Fang, Yao, Luo, Kun, Fan, Jianren |
| المصدر: |
Journal of the Energy Institute (Elsevier Science); Aug2021, Vol. 97, p138-151, 14p |
| مصطلحات موضوعية: |
NITROGEN fixation, QUANTUM chemistry, ACTIVATION energy, COAL combustion, BINDING energy, GENERATION X |
| مستخلص: |
Air-staging combustion is the widely-used low-nitrogen combustion technology. In this process of NO x reduction, the role played by CO resulted from the air-staged combustion cannot be ignored. In this study, quantum chemistry method is used to investigate the effects of the CO on the NO x generation/reduction and on the char surface. Theoretical calculations indicate that CO is involved in nitrogen fixation during the migration and transformation of N. During the oxidation of N-containing char, CO increases the binding energy of N of pyridine with adjacent C atoms, which is not conducive to the N precipitation. During reduction of NO x by char, CO decreases the desorption energy barrier of N 2 and promotes NO heterogeneous reduction. On the other hand, CO promotes the re-embedding of N in generated NO into the char to form char-N. XPS experiments are carried out for the coal char samples after the air-staged combustion. The experimental results show that high CO concentration is conducive to retention N. When the excess air coefficient (α) is 0.8, the increase of N-6 content is 7.2% larger than that of α = 0.9. This work discovers the nitrogen fixation of CO, enriches and expands the understanding of the role of CO. • CO changes the char-N heterogeneous oxidation and reduces the activation energy of NO heterogeneous reduction. • CO is not conducive to the precipitation of N during char-N oxidation process. • CO promotes the heterogeneous oxidation process of C in the char to CO 2 formation. • Kinetic analysis reveals that NO can be re-embedded on the char surface to form char-N when the temperature above 1100 K. • This work obtains another important role of CO, that is, nitrogen fixation. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
