Types of Gasifiers

Gasifiers are basically divided into two major types namely fixed bed and fluidized bed. Fixed bed gasifiers typically have a grate to support the feed material and maintain a stationary reaction zone. They are relatively easy to design and operate, and are therefore useful for small and medium scale power and thermal energy uses. It is difficult, however, to maintain uniform operating temperatures and ensure adequate gas mixing in the reaction zone. As a result, gas yields can be unpredictable and are not optimal for large-scale power purposes (i.e. over 1 MW). The primary types of fixed bed gasifiers are updraft, downdraft and crossdraft.