Moving-bed gasifiers

There are essentially three types of coal gasifiers moving-bed or countercurrent reactors fluidized-bed or back-mixed reactors and entrained-flow or plug-flow reactors. The three types are shown schematically in Eigure 2. 

Limestone Injection (directly into gasifier) Moving-Bed... 

Water Gas Cyclic process—air to heat, steam to gasify, moving bed, atmospheric pressure 300... 

Characteristics of moving-bed gasifiers are low gasification temperatures, relatively low oxygen requirements, relatively high methane content in... 

The importance of these concepts can be illustrated by the extent to which the pyrolysis reactions contribute to gas produdion. In a moving-bed gasifier (e.g., producer-gas gasifier), the particle is heated through several distinct thermal zones. At the initial heat-up zone, coal carbonization or devolatilization dominates. In the successively hotter zones, char devolatihzation, char gasification, and fixed carbon... 

British Gas Lurgi Westfield, Scotland 600 TPD/30 MWe Commissioned in 1984 Demonstration unit pressurised dry feed moving bed slagging BGL Gasifier... 

Chapter 1 provided an overview of the most recent developments in gasification technologies. The three primary types of generic gasifiers are entrained flow, fluidized bed, and moving bed. 

There are only three types of processes using moving-bed gasifiers (BGL, BHEL, Lurgi) developed at industrial scale. They are the most mature technologies of the three types of... 

Figure 2. Schematic of moving-bed coal gasifier with typical reaction temperature...

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