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GASIFICATION - Coggle Diagram

- - - - • Requires a uniform, homogenous fuel
        
        • Fuel flow through the gasifier by gravity with air & fuel flow cocurrently
        
        • Possible to operate in counter-current with air & fuel flow upwards
    - - • Consist primary & secondary combustion chamber
        
        • Primary chamber: waste is gasified by partial combustion under substoichiometric condition
        
        • Secondary chamber: gas from primary chamber will combusted with excess air
    - - • The fuel is fluidized in oxygen & steam
        
        • The ash is removed dry or as heavy agglomerates that defluidize
        
        • The temperature are low in dry ash, so the fuel must be highly reactive
        
        • The agglomerating gasifiers have higher temperature. Suitable for higher rank coals
        
        • Fuel throughput higher than the fixed bed