Method of retrofitting a coal gasifier

US8617271B2 · kind B2 · utility

Assignee

• General Electric Company · US

Inventors

• Vladimir Zamansky · Oceanside, US
• Vitali Victor Lissianski · San Juan Capistrano, US
• Boris Nikolaevich Eiteneer · Irvine, US
• Wei Wei · Beijing, CN
• Ravichandra Srinivasa Jupudi · Bengaluru, IN
• Ramanathan Subramanian · Milpitas, US

Key dates

• Filing date: Dec 18, 2008
• Grant date: Dec 31, 2013
• Expiry date: Feb 13, 2031

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/145
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A coal gasifier is retrofitted to achieve multiple advantages such as reduced oxygen consumption, reduced CO2 and NOx emissions, better H:C ratio, better carbon conversion etc. This is achieved by dividing the coal into at least two zones and modifying the gasifier and operating it as described. The coal is injected into a first zone, configured to devolatilize a substantial portion of the injected coal to produce coal char and volatiles. The operation is tuned to substantially consume the oxidant injected in the first zone. A low-calorific-value, high oxidant feedstock is injected in second zone of the gasifier. The devolatilization of the low-calorific-value, high oxidant content feedstock provides the oxygen containing compounds which gasify at least a portion of the coal char generated in the first zone.