BIOMASS GASIFIERS

Gasifier is a place or equipment where a fuel can be converted into high value syngas (composed mainly of H2, CO, CH4, C2H4, etc.) through a series of thermochemical reactions (mainly including water evaporation, volatilization, oxidation and reduction). Gasifier structures have significant influences on the gasification reactions and results. This chapter introduces the main gasifier structures, and these include fixed bed gasifiers (updraft and downdraft), fluidized bed gasifiers (bubbling fluidized bed, circulating fluidized bed and dual fluidized bed), entrained flow gasifiers (Koppers-Totzek (K-T) gasifier, shell gasifier, Gas Schwarze Pumpe (GSP) gasifier and Colin gasifier). The other gasifier structures are also presented, and these include solar gasifier, microwave gasifier and plasma gasifier, etc. Some conclusions and future outlook are also briefly stated and summarized in the last (sixth) section. Through the detailed introduction of different types of gasifiers, the content of this chapter gives a comprehensive and intuitive understanding of the existing gasifiers, and it may play a certain guiding role in the development of subsequent gasifiers.