Process for drying of organic solid materials, particularly brown coals

US4514912A · kind A · utility

Assignee

• Voest-Alpine · AT

Inventors

• Alois Janusch · Leoben, AT
• Franz W. Mayer · Proleb, AT

Key dates

• Filing date: Nov 14, 1980
• Grant date: May 7, 1985
• Expiry date: Nov 14, 2000

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F26B7/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

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).