Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 289, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2023.117149
Keywords
Green hydrogen; Producer gas; Downdraft gasifier; Gas turbine; Organic Rankine cycle; Alkaline water electrolyzer
Categories
Ask authors/readers for more resources
This research proposes an innovative method of continuous decentralized production of renewable hydrogen from woody biomass. It utilizes alkaline water electrolysis (AWE) to produce high-purity hydrogen and simultaneously uses the oxygen by-product to fuel a biomass downdraft gasifier. The resulting fuel gas goes through a conditioning stage before being used in a combined cycle for electric power generation with an efficiency of approximately 40%.
This research work presents an innovative approach for continuous decentralized production of renewable hydrogen from woody biomass. Alkaline water electrolysis (AWE) is used to produce high-purity hydrogen, while the oxygen by-product is mixed with ambient air and used to fire a biomass-fueled downdraft gasifier in order to produce an upgraded producer gas with a lower heating value (LHV) between 7-8 MJ/Nm3. This fuel gas is then subjected to a conditioning stage and eventually fed to a combined cycle consisting of a recuperative gas turbine as topping unit and a regenerative subcritical organic Rankine cycle as bottoming unit, which together allow for a combined electric power generation efficiency close to 40%. Most of the net AC power from the integrated gasification combined cycle (IGCC) is rectified to DC power and ultimately used to power an alkaline electrolyzer, with a minor share allocated to all the required utilities and ancillary equipment, including hydrogen compression to 200 bar. The results from simulation of the hybrid IGCC-AWE plant under steady-state operating conditions in Aspen Plus V.11 indicate an optimal efficiency of 17.6% based on the LHV of hydrogen. Thus, if sized for a biomass consumption of 1 t/h, the proposed plant is capable of providing around 26 kg/h of compressed hydrogen at 200 bar.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available