Process of controlling the starting up of the gasification of solid fuels in a fluidized state

US5145491A · kind A · utility

Inventors

• Gerhard Schmitt · Bensheim, DE
• Horst Mielke · Neu-Isenburg, DE
• Peter Herbert · Berlin, DE

Key dates

• Filing date: Oct 15, 1991
• Grant date: Sep 8, 1992
• Expiry date: Oct 15, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S48/04
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Fuels are gasified in a fluidized state by a treatment with oxygen-containing gas and water vapor in a gasifying reactor. A solids mixture which contains ash and fine-grained fuels is combusted in a heating-up phase, which precedes the gasification and in which the temperature in the reactor is increased approximately to the temperature desired for the gasification. In a succeeding inertizing phase the supply rate of oxygen-containing gas is decreased and an inert gas is fed to the reactor until the product gas no longer contains free oxygen whereas the temperature is maintained virtually constant. In the succeeding gasification the fuel supply rate is increased and, after an adjusting time, the temperature is maintained virtually constant at the value desired for the gasification in the range from 600.degree. to 1500.degree. C. The gasification temperature is controlled by a change of the fuel supply rate.