E-Gas gasification

A generic model for the E-Gas gasification process has been established applying the boundary conditions from Table 5.11. The results presented in Table 6.14 show the effect of two-stage slurry feeding where H2/CO ratios between 0.75 and 0.80 can be obtained at elevated cold gas efficiencies of 73.9-80.2%, which can be traced to the chemical quench and the comparatively high methane content of the product gas. When SAf coal is used instead of Pitt 8 coal, the increase in oxygen consumption is limited to 7.7% (8.6% in the case of GE-R ... 

In the case of the E-Gas gasification, the first stages can also be displayed as distinct points, which are inside the slurry-feed entrained-flow domain for the standard system and inside the dry-feed domain for the enhanced system (entrained slagging transport reactor [E-STR]). The slurry point, which is located at the coal-H20 axis, represents the coal-water slurry that is introduced in the second stage. The overall mixing points, again, represent the outlet of the gasifier and can be found inside the fluid-bed domain. 

Fig. 25 Simplified process flow diagram of the IGCC with fuel cell 2MW carbonate fuel cell power plant operating on coal gas from an E-gas gasification plant.

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