Inclined fluidized bed system for drying fine coal

Details Inclined fluidized bed system for drying fine coal Inclined fluidized bed system for drying fine coal

1990-08-03

1992-02-11

Dees, Carl F.

Fuel and related compositions

Coal treating process or product thereof

Removal of undesirable

44501, 34 22, 34 57C, C10L 908, F26B 308

Patent

active

050872699

ABSTRACT:
Coal is processed in an inclined fluidized bed dryer operated in a plug-flow manner with zonal temperature and composition control, and an inert fluidizing gas, such as carbon dioxide or combustion gas. Recycled carbon dioxide, which is used for drying, pyrolysis, quenching, and cooling, is produced by partial decarboxylation of the coal. The coal is heated sufficiently to mobilize coal tar by further pyrolysis, which seals micropores upon quenching. Further cooling with carbon dioxide enhances stabilization.

REFERENCES:
patent: 708604 (1902-09-01), Welch
patent: 3755912 (1973-09-01), Hamada et al.
patent: 4031354 (1977-06-01), D'Souza
patent: 4249909 (1981-02-01), Comolli
patent: 4495710 (1985-01-01), Ottoson
patent: 4725337 (1988-02-01), Greene

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