Hydrogen combustion configuration

Figure 11.4 Schematic representation of the two fluidized membrane reactor concepts for autothermal methane reforming with integrated CO2 capture (a) Methane combustion configuration (b) Hydrogen combustion configuration, after Patil et al.

This problem can be circumvented by using novel reactor configurations proposed by van Sint Annaland and co-workers [44, 52-54]. In particular, two configurations have been proposed to achieve autothermal methane reforming methane combustion configuration and hydrogen combustion configuration. 

Figure 3.15 Hydrogen combustion configuration for pure hydrogen production through...

In Figure 33.9, the hydrogen combustion configuration is shown, where the energy for steam reforming is delivered via burning part of the produced... 

The methane combustion configuration is sketched in Figure 3.14 and consists of two sections [44]. Hydrogen permselective membranes are integrated in a fiuidized reform-ing/shift top section where ultra-pure H2 is extracted and the energy required for the SR is supplied via in situ methane oxidation in a separate fluidized bottom section, where oxygen is selectively fed to the methane/steam feed via oxygen permselective membranes. 

It should be recalled that for P < 0.17-0.2 MPa the gas outflows to the surroundings at a subsonic rate. At larger pressures, the hydrogen outflows at a supersonic rate. This supersonic outflow is accompanied by the occurrence of a well known wave configuration which is complicated by the hydrogen combustion around the under-expanded gas jet [36]. 

As illustrated in Fig. 1.2, a premixed flow of acetylene, hydrogen, and oxygen issue from a flat burner face onto a parallel, flat surface. Mathematically there is very little difference between this situation and one in which two flat burners face each other, in an opposed-flow configuration. There are many commonly used variants of the opposed-flow geometry. For example, premixed, combustible, gases could issue from both burner faces, causing twin premixed flames. Alternatively, fuel could issue from one side and oxidizer from the other, causing a nonpremixed, or diffusion, flame. 

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