Main content area

Steam Gasification Rates of Three Bituminous Coal Chars in an Entrained-Flow Reactor at Pressurized Conditions

Lewis, Aaron D., Holland, Troy M., Marchant, Nathaniel R., Fletcher, Emmett G., Henley, Daniel J., Fuller, Eric G., Fletcher, Thomas H.
Energy & Fuels 2015 v.29 no.3 pp. 1479-1493
carbon dioxide, cholecystokinin, coal, gasification, models, steam, temperature, Utah
Three bituminous coal chars (Illinois #6, Utah Skyline, and Pittsburgh #8) were gasified separately at total pressures of 10 and 15 atm in an entrained-flow reactor using gas temperatures up to 1830 K and particle residence times <240 ms. Most of the experiments were performed at conditions where the majority of particle mass release was due to H₂O gasification, although select experiments were performed at conditions where significant mass release was due to gasification by both H₂O and CO₂. The measured coal data were fit to three char gasification models including a simple first-order global model, as well as the CCKᴺ and CCK models that stem from the CBK model. The optimal kinetic parameters for each of the three models are reported, and the steam reactivity of the coal chars at the studied conditions is as follows: Pittsburgh #8 > Utah Skyline > Illinois #6.