Abstract
Low-rank coal (LRC) upgrading is essential to convert LRC to a more thermal-efficient and environmentally friendly fuel before utilization in coal-based industries. Briquetting and pyrolysis are the dominant route, where briquettes are usually in the shape of an ellipsoid through a two-roll briquetting process. In this work, an integrated numerical model is developed to predict the pyrolysis process of ellipsoidal LRC briquettes in a packed-bed pyrolyzer. A computational fluid dynamics (CFD) model is developed to describe the flow and thermochemical behaviors related to the pyrolysis of ellipsoidal LRC briquettes, including dewatering, pyrolysis, and other homo- and heterogeneous chemical reactions. A discrete element method (DEM) model is used to describe the packing density distribution of ellipsoidal briquettes. The model is validated against the measurements in a pilot-scale test rig in terms of the temperature history and gas species yields. Typical in-furnace phenomena are illustrated, including flo...
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