Fluidized-bed gasifier

To avoid degradation of the construction materials used for the treatment unit, it has been customary to undertake cleaning after the gas has been cooled to below 100 °C, but this reduces the overall energy efficiency of the plant and increases both capital and operating costs. When using IGCC technology, the 

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The means by which synthetic gaseous fuels could be produced from a variety of biomass sources are variable and many of the known gasification technologies can be appHed to the problem (70,71,76—82). For example, the Lurgi circulatory fluidized-bed gasifier is available for the production of gaseous products from biomass feedstocks as well as from coal (83,84). 

Dried coal is pneumatically conveyed to feed bins, pressurized through lockhoppers, and fed to the refractory-lined fluidized-bed gasifier vessel by variable-speed screws. The gasifying agent, mixed oxygen and steam, is fed near the bottom of the gasifier. The bed operates at 2.5 MPa (25 bar) and... 

Kojima, T., Yoshitake, H., Kimura, T., Matsukata, M., and Uemiya, S., Contribution of Local Reactions in the Grid Zone to the Performance of a Jetting Fluidized Bed Gasifier of Coal Char, Energy Fuels, 9 379 (1995)... 

KRW Figure 2.5 illustrates key features of this gasifier. Coal and limestone, crushed to below 1/4," are transferred from feed storage to the KRW fluidized-bed gasifier via a lock hopper system. Gasification takes place by mixing steam and... 

In the fluidized bed gasifier, crushed coal is introduced into a fluidized bed of char together with oxygen or air and steam. Coal undergoes drying, devolatilization, gasification and combustion at essentially constant temperature of about 1000 C because of the rapid mixing characteristics of fluidized beds. 

Warnecke, R. 2000. Gasification of biomass comparison of fixed bed and fluidized bed gasifier. Biomass Bioenergy 18 489-497. 

Figure 2. Differentiation between liquefaction and gasification by-product waters by pH and redox potential characteristics 1 and 2, waste water PETC coal liquefaction development unit, disposable catalyst, runs DCD 13B and DCD 12 3, waste water, SRC-1 plant 4, scrubber water, light oil, Blacksville No. 2 coal 5, waste water, fixed-bed gasifier, METC 6, waste water, fluidized-bed gasifier, Rosebud coal, PETC 7, gasifier condensate, 40 atm Nt, catalyst-impregnated Illinois 6 coal 8, gasifier condensate, 40 atm He, Montana Rosebud coal.

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