Steam oxygen gasification

The gasification is performed usiag oxygen and steam (qv), usually at elevated pressures. The steam—oxygen ratio along with reaction temperature and pressure determine the equiUbrium gas composition. The reaction rates for these reactions are relatively slow and heats of formation are negative. Catalysts maybe necessary for complete reaction (2,3,24,42,43). 

Synthesis Gas Generation Routes. Any hydrocarbon that can be converted into a synthesis gas by either reforming with steam (eq. 4) or gasification with oxygen (eq. 5) is a potential feedstock for methanol. 

Figure 2. IGT HYGAS process —steam-oxygen gasification...

Caballero, M. A. Aznar, M. P. Gil, J. Martin, J. A. Frances, E. Corella, J., Commercial steam reforming catalysts to improve biomass gasification with steam-oxygen mixtures. 1. Hot gas upgrading by the catalytic reactor. Industrial and Engineering Chemistry Research 1997,36(12), 5227-5239. 

Regeneration of coked catalysts may be accomplished by gasification with oxygen, steam, hydrogen, or carbon dioxide ... 

The three principal reactor types employed in coal gasifier design are the moving packed bed, the entrained flow, and the fluidized bed reactor. In the discussion of gasification principles the moving packed bed (Fig. 3) was used to illustrate steam-oxygen or steam-air gasification of coal. 

The gas feed stream is split, recycle CO2 is added to each stream and the combined streams are fed to each of the two gasification trains. Oxygen from the Air Separation Unit (ASU) is preheated by steam, split and fed to the two gasification trains. Partial oxidation and reforming reactions take place in the Gasifiers. 

Squires, A. M. Steam-oxygen gasification of fine sizes of coal in a fluidised bed at elevated pressures, parts I, II, and III, Trans. Insln. Chem. Engrs. (London) 39, 3-27 (see especially pp. 14-15) (1961). 

Figure 3. Time sequence of bubble evolution during steam oxygen gasification in IGT 6-in. diameter bench scale reactor...

Directly Heated, High-Temperature, Steam-Oxygen Fluid-Bed Gasification... 

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