Abstract

A method for using a downdraft gasifier comprising a housing and a refractory stack contained within the housing. The refractory stack may comprise various sections. Apertures in the sections may be aligned to form multiple columnar cavities. Each columnar cavity may comprise an individual oxidation zone. The method of use may include the steps of placing a feedstock into an upper portion of the refractory stack, measuring the temperature of each columnar cavity, and adjusting the flow of oxygen to a particular columnar cavity to maintain the temperature of the particular columnar cavity within a particular range.

IPC Classes  ?

• C10J 3/26 - Arrangements or dispositions of valves or flues to permit flow of gases or vapours other than upwardly through the fuel bed downwardly
• C10J 3/32 - Devices for distributing fuel evenly over the bed for stirring-up the fuel bed
• C10J 3/34 - GratesMechanical ash-removing devices
• C10J 3/72 - Other features
• C10J 3/36 - Fixed grates