Method and apparatus for conditioning bulk material

US4785554A · kind A · utility

Assignee

• UHDE GMBH · DE

Inventors

• Hartmut Hederer · Dortmund, DE
• Manfred Kreft · Nottuln, DE
• Wolfgang Hillebrand · Dortmund, DE

Key dates

• Filing date: Nov 25, 1987
• Grant date: Nov 22, 1988
• Expiry date: Nov 25, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P70/10
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Bulk material containing vaporizable ingredients, such as lignite, hard coal, peat, waste wood, clarifier sludge, waste sludge, contaminated earth, catalysts, zeolites and filter cake, is conditioned by means of a vibrating plate conveyor divided into a heating section and a drying section, using an indirect heat exchange method. The bulk material is heated in an enclosed heating section while withdrawing the vapor from this section. In the downstream enclosed drying section, the vaporizable fractions contained in the bulk material are further reduced with the aid of heat supplied indirectly, the vapor being withdrawn. The bulk material is separated several times into coarse and fine fractions utilizing at least one slotted grid, the fines being immediately recycled and remixed with the coarse fractions which have a higher water content. The bulk material is mixed several times while being heated in the drying section before discharge.