Process of gasifying solid fuels in a moving bed and in a fluidized bed

US4556402A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Paul Rudolph · Bad Homburg vor der Höhe, DE
• Martin Hirsch · Friedrichsdorf, DE

Key dates

• Filing date: Mar 14, 1984
• Grant date: Dec 3, 1985
• Expiry date: Mar 14, 2004

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/129
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Coarse-grained fuels are gasified in a moving bed under a pressure of 5 to 150 bars with oxygen, water vapor and, if desired, carbon dioxide. The resulting product gas is at temperatures of 250.degree. to 700.degree. C. and is cooled to temperatures in the range from 120.degree. to 220.degree. C. to form an aqueous condensate, which contains distillation products and is known as gas liquor. The gas liquor obtained by the gasification in a moving bed is pressure-relieved to atmospheric or a higher pressure and the flashed-off vapor is supplied to the fluidized bed gasifier. In the fluidized bed gasifier, fine-grained solid fuels are gasified under a pressure which is lower than that in the moving bed. The flashed-off vapor supplied to the fluidized bed supplies at least one-half of the water vapor required for the gasification in the fluidized bed. The water vapor contained in the product gas formed by the gasification in the fluidized bed is cooled and the resulting condensate is treated separately from the gas liquor obtained by the gasification in a moving bed.