Process for drying of organic solid materials, particularly brow

Details Process for drying of organic solid materials, particularly brow Process for drying of organic solid materials, particularly brow

1980-11-14

1985-05-07

Dixon, Jr., William R.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 15, 34 9, 44 1G, 44 10D, 44 10E, 44 12, F26B 306

Patent

active

045149127

ABSTRACT:
For drying organic solid materials, such as brown coals, the solid materials are, particularly for the purpose of immediately subsequent briquetting or refinement or gasification, respectively, preheated and introduced into an atmosphere of saturated steam at super-atmospheric pressure and increased temperature. After such a first drying stage (1, 2) operated with saturated steam, the process water formed in this drying stage is separated and the solid materials are at least partially pressure-released and subsequently further dried within an atmosphere of superheated steam at a temperature of at least 200.degree. C. of this steam atmosphere. The steam of this further drying stage (7) is passed along a closed circuit via heat exchangers (10, 11) and brought to or maintained at the required temperature. A portion of the steam passed along a closed circuit, that portion approximately corresponding to the amount of steam having its origin in the water content of the solid materials, is tapped via conduit (12) and used for preheating purposes (FIG. 1).

REFERENCES:
patent: 1679078 (1928-07-01), Fleissner
patent: 3007254 (1961-11-01), Schuster
patent: 3027652 (1962-04-01), Wallace
patent: 3518773 (1970-07-01), Johanson
patent: 4285140 (1981-08-01), van Raam et al.

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