**Acknowledgements**

*Sustainable Alternative Syngas Fuel*

**56**

**4. Conclusion**

**Figure 3.**

fraction of solid fuels in the inert porous matrix.

*fractions of [H2O]/[O2] [38]: (1) 1.0; (2) 2.5; and (3) 4.5.*

of mass fraction presented. In high mass fraction (> 60%), temperature decreases because heat is necessary to convert solid fuels into syngas. The combustion waves for (1) and (2) were found to be totally superadiabatic over the whole range of mass fraction tested. With different gaseous and solid fuels, the [H2]/[CO] ratios formed are between 0.4 and 2.0, in all the range of mass fraction reported (**Figure 3B**).

*Effect of varying the mass fraction of different carbonaceous fuels in the porous matrix on the (A) peak recorded temperatures (dashed, dotted, and dash-dotted lines) and combustion wave propagation rate (solid lines) and (B) [H2]/[CO] ratios for three different experimental sets: (1) ultrarich natural gas and air mixture with bituminous coal [26], (2) steam-air mixtures with bituminous coal [23], and (3) charcoal with different* 

In this chapter, experimental results were presented for hybrid filtration combustion of different gaseous and solid fuels. Results are focused in combustion temperatures, waves, and [H2]/[CO] ratios with varying equivalence ratio and mass

The authors wish to acknowledge the financial support by the FONDECYT 1190654 and FONDAP 15110019/SERC-Chile.
