Table

Characteristics of Generic Gasifier Types

Gasifier Type

Fixed Bed Fluidized-Bed Entrained Flow

Ash Conditions

Dry Ash Slagging Dry Ash Agglomerating Slagging

Fuel characteristics Fuel size limits Caking coal acceptable? Preferred feedstock

Ash content limits

Preferred ash melting temperature (°F)

Operating characteristics Exit gas temperature (°F) Gasification pressure (psig) Oxidant requirement Steam requirement Unit capacities (MWth equiv.)

Key distinguishing characteristics

Key technical issue

Yes, with modifications

Lignite, reactive bituminous coal, anthracite, wastes

No limitation

>2200

Low0 (800-1200)

435+

High

0 0

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