Method of controlling the gasification of solid fuels in a rotary-grate gas producer

US5094669A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Peter Herbert · Berlin, DE
• Gerhard Schmitt · Bensheim, DE

Key dates

• Filing date: Sep 7, 1990
• Grant date: Mar 10, 1992
• Expiry date: Sep 7, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S48/10
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

In a rotary-grate gas producer operated under a pressure from 10 to 100 bars, the fuel constitutes a fixed bed, which slow descends. The mixture of gasifying agents contains water vapor and oxygen is supplied to the fixed bed through a rotary grate and through an ash layer, which is disposed on the rotary grate. In order to ensure that the ash will have a particle size in a desired range, a first pressure (p1) is measured below the rotary grate and a second pressure (p2) is measured approximately at the top of the ash layer. The pressure difference (p1-p2) is compared with a setpoint, which is associated with the current ratio of water vapor to oxygen in the mixture of gasifying agent. Said ratio is increased when the pressure difference is insufficient and the ratio is decreased if the pressure difference is excessive.