Process for gasifying coal

US4852996A · kind A · utility

Assignee

• Man Gutehoffnungshutte Aktiengesellschaft · DE

Inventors

• Klaus Knop · Geldern, DE
• Gunter Wolters · Düsseldorf, DE
• Helmut Kubiak · Herne, DE

Key dates

• Filing date: May 21, 1986
• Grant date: Aug 1, 1989
• Expiry date: May 21, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E20/18
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Part of the synthesis gas produced by coal gasification in an allothermically heated fluidized bed reactor is burned after removal of dust and sulfur and serves as a source of energy to heat the reactor by indirect heat exchange and to produce the steam required for the gasification process. The flue gas exiting from the heat exchanger of the reactor can be used to perform work in expansion turbines. The rest of the synthesis gas is available for use in downstream processes, such as iron ore reduction, or can be burned and used to perform work in turbines to produce electric current. The result is a process that is environmentally safer and operates with a better yield than direct coal burning or autothermal coal gasification, but requires no outside source of energy, such as nuclear power, as prior art allothermal coal gasification processes do.