Aspen Plus: Hydrogen generation from biomass using a chemical looping process and storage as ammonia

One of the disadvantages of H2 as an energy carrier is its low volumetric energy density.

Because of this disadvantage, many authors have suggested NH3 as energy storage for H2 (H2 should be converted into NH3 using the Haber Bosch process).

H2 is no primary energy source.

An interesting energy source for H2 is biomass.

One gasifies biomass and separates H2 from the other gaseous products.

The paper:
Kyohsuke Miyahira, Muhammad Aziz. Hydrogen and ammonia production from low-grade agricultural waste adopting chemical looping process. Journal of Cleaner Production 372. 2022.
dealt with the processes: biomass gasification, chemical looping and Haber Bosch.

We simulate these processes based on data of the paper.

Biomass (husk) specifications
Proximate analysis
Moisture: 18
Fixed carbon: 16.22
Volatile matter: 63.52
Ash: 20.26

Ultimate analysis
Ash: 20.26
Carbon: 38.83
Hydrogen: 4.75
Nitrogen: 0.52
Chlorine: 0.12
Sulfur: 0.05
Oxygen: 35.47

Gasification parameters
Biomass feed: 180 tons/day
Temperature: 1100 °C
H2O feed: 50 kg/h

Chemical looping
Fe2O3 fraction: 70 weight-%
Al2O3 fraction: 30 weight-%
Fe2O3-Al2O3-Feed: 78000 kg/h
Reduction temperature: 850 °C
Oxidation: adiabatic
H2O for Oxidation: 19950 kg/h
Combustion: 1300 °C
Air for combustion: 7850 kg/h

Haber Bosch
H2/N3: 3
Pressure: 150 bar
Temperature: 450 °C

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