Technology of Gasification Processes

If the bed is loosened as the gas flow rate increases and becomes turbulent when the minimum fluidizing velocity is exceeded, the system is called fluidized-bed gasification. This principle is used in Winkler gasifiers. 

If the gas velocity accelerates the coal particles beyond mere suspension so that they are pneumatically lifted, gasification takes place in a cloud of dust and the system is termed entrained-bed gasification. This principle is today used by 

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