Method for producing non-abrasive coke forms from brown-coal briquets

US4134794A · kind A · utility

Assignees

• Firma Carl Still · DE
• Rheinische Braunkohlenwerke AG · DE

Inventors

• Kurt Lorenz · Hattingen, DE
• Horst Dungs · Herne, DE
• Peter Speich · Cologne, DE

Key dates

• Filing date: Sep 28, 1977
• Grant date: Jan 16, 1979
• Expiry date: Sep 28, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10B53/08
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The coke forms are produced in four stages, each constituted by a respective oven chamber, and in which the briquets are, respectively, preheated, dehydrated or dried, carbonized and cooled. Hot gas circuits are provided, in which the hot gas is composed substantially of burnt lean gas of the carbonization, and, for each stage, the hot gases are recirculated in a separate respective circuit. In the preheating, dehydrating and carbonization stages, the hot gases are heated and produced, or supplemented, in a respective separate combustion chamber with the recirculating hot gas in the carbonization stage being supplemented with cooled lean gas from this stage. The recirculating hot gases are dedusted separately in a dust settling chamber in which their flow velocity is reduced to approximately 0.2 to 2.0 m/sec, with the dust being collected. Steam may be added to the recirculating hot gas of the preheating stage, drying stage, or both, and the pressure in the hot gas circuits is maintained at a level slightly higher than atmospheric pressure. The oven chambers are arranged as a vertical oven block plant and the oven chambers are interconnected with each other by transition zones whic…