Young Suk Jo1*, Junyoung Cha1,2, Hyuntae Sohn1, Suk Woo Nam1,2 and Chang Won Yoon1,3; [1] Fuel Cell Research Center, Korea Institute of Science and Technology (KIST), South Korea, [2] Green School, Korea University, South Korea, [3] Kyunghee University, South Korea
15th Annual NH3 Fuel Conference, Pittsburgh, PA, October 31, 2018
NH3 Energy+ Topical Conference at the AIChE Annual Meeting
ABSTRACT
The shortage of fossil fuels and emission of carbon dioxide to the environment have attracted an interest in discovering renewable energy as the next generation energy source. Owing to its intermittent and unpredictable nature, however, excess renewable energy needs to be stored and reused on demand. In the regard, hydrogen, which possesses a high gravimetric energy density and carbon free combustion process, has been extensively researched as a promising renewable energy carrier. However, the distribution and storage of hydrogen still raise important challenges due to the low volumetric energy density of hydrogen for its wide utilization. Currently, gaseous hydrogen transportation by pipeline and batch transportation using liquefied/compressed hydrogen have been implemented, but are either not economically viable, particularly for long distance transport, or significantly energy-intensive. Therefore, a lot of attention recently has been paid to the liquid chemical hydrogen storage materials such as liquid ammonia, cycloalkanes and heterocycles, formic acid, and so forth.
Among the candidates, liquid ammonia is an excellent hydrogen carrier owing to its high gravimetric and volumetric hydrogen storage capacities and moderate condensation conditions compared to other chemical hydrogen storage materials. Furthermore, the production and distribution activities of ammonia are already well-established processes internationally. The liquid ammonia can be dehydrogenated at the temperatures of ≤ 550 °C leading to hydrogen and nitrogen as major products with no carbon release to the environment. All these properties make liquid ammonia highly intriguing as a hydrogen carrier for power generation in conjunction with fuel cells.
The present study demonstrates a > 1kW-class COx-free power generation system including an ammonia feed, a dehydrogenation reactor, a i-butane burner, a heat exchanger, a hydrogen purification unit and a PEMFC. Continue reading
