Assessing the waste heat recovery potential of liquid organic hydrogen carrier chains

Proper thermal management can improve the efficiency of hydrogen storage chains based on liquid organic carriers (LOHC). The energy and exergy efficiencies 24 LOHC chains, which are differentiated by two sources (SEL: from electrolyzer SINDU: industrial by-product), three consumers (CPEMFC: proton exchange membrane fuel cell, CSOFC: solid oxide CINDU: consumer), four pairs calculated thermodynamic modeling. Possible strategies for heat integration between (including hydrogenation heat, generated consumer, high-temperature fluids) sinks preheating, dehydrogenation, external heating purposes) designed these chains. In selected pairs, dibenzyltoluene (DBT) is found to be most favorable pair implementation WHR strategies, mainly because low demand preheating (8.9% stored energy) a high dehydrogenation rate. significantly up 21.7% points with CINDU 40.8% CSOFC or CPEMFC, makes more efficient than traditional compressed in several scenarios, i.e., DBT chain CPEMFC have highest (70.4% SEL/69.5% SINDU), while SINDU has (60.6%). For remaining combinations consumers, efficient.