| Autor: |
Yoshiaki YAMAZAKI, Kenichi HIRAKI, Tetsuya KANAI, Xiaoqing ZHANG, Yohsuke MATSUSHITA, Masakazu SHOJI, Hideyuki AOKI, Takatoshi MIURA |
| Jazyk: |
angličtina |
| Rok vydání: |
2011 |
| Předmět: |
|
| Zdroj: |
Journal of Thermal Science and Technology, Vol 6, Iss 2, Pp 278-288 (2011) |
| Druh dokumentu: |
article |
| ISSN: |
1880-5566 |
| DOI: |
10.1299/jtst.6.278 |
| Popis: |
In order to prevent pulverization and fracture of metallurgical coke, control of gasification reaction part in coke lump and embrittlement behavior is important. Addition of catalyst particle is an effective and a simple method for enhancement of the CO2 gasification reactivity. However, the effect of the catalyst particle on coke-matrix and gasification part of coke lump after gasification reaction has not been investigated. In this study, the effect of iron particles on coke-matrix state after gasification reaction is investigated experimentally. Coke-matrix vanishing is evaluated by spatial distribution of lump porosity and microscopic observation. Elastic modulus of coke-matrix is evaluated by nano-indentation method. Coke lumps with and without iron-particles (ferrous coke and formed coke, respectively) were used. These coke lumps were gasified by CO2-containing gas. Reaction temperature was set at 1173 K. Reaction gas compositions were set at 100/0 and 50/50 in ratio of CO2/CO. In each reaction gas composition, in ferrous coke, a decrease in the elastic modulus of coke-matrix with progress of gasification is smaller than that in formed coke and coke-matrix vanishing occurred. It is suggested that the iron particle promotes gasification reaction of coke-matrix selectively around itself (and coke-matrix in that part is rapidly vanished). It is also suggested that this reaction mechanism maintains elastic modulus of coke-matrix because of the local rapid gasification reaction around the iron particle. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
