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- Title
Combustion of pure carbon in the presence of H<sub>2</sub>O and CO<sub>2</sub> using single and double film models.
- Authors
Chen, Wei; Annamlai, Kalyan; Sundar, Rohit
- Abstract
In integrated gasification combined cycles systems, it is of interest to estimate the burn or gasification rate (m˙), particle surface/wall temperature (Tw), and flame temperature (Tf), and also control of the Tw and Tf with free stream CO2 and the H2O level, which promote endothermic reactions. In the past, char combustion in the air was modelled using either a conventional single film model (SFM), or a conventional double film model (DFM). In this study, modified SFM and DFM models, including both heterogeneous reactions of CO2 and H2O with C, and gas phase oxidation of both CO and H2, were developed. The SFM and DFM were switched to SFM‐DR (single film model with double reactions) and DFM‐DR (double film model with double reactions). The SFM‐DR assumes that the gas phase is frozen, with the final products being CO and H2, and the transfer number modified to B=YO2,infvO2,I+YCO2,infvCO2,III+YH2O,infvH2O,IV; DFM‐DR includes gas phase oxidation of both CO and H2 with O2, with the final products being CO2 and H2O and the same modified transfer number B under infinitely fast chemistry. Finally, six different char combustion cases with or without H2O and CO2 in the free stream were simulated to obtain the flame profile for modified SFM‐DR and DFM‐DR. It was found that reasonable flame profiles of char combustion were obtained for both SFD‐DR and DFM‐DR. Moreover, the O2‐rich combustion could promote the endothermic Boudouard and steam‐carbon reactions. Finally, the burning rate (kg/m2 · s) decreased with the increase of particle diameter for both SFM‐DR and DFM‐DR.
- Subjects
INTEGRATED gasification combined cycle power plants; CARBON dioxide; ENDOTHERMIC reactions
- Publication
Canadian Journal of Chemical Engineering, 2018, Vol 96, Issue 12, p2564
- ISSN
0008-4034
- Publication type
Article
- DOI
10.1002/cjce.23177