Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 229, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2020.113775
Keywords
Solid oxide electrolyzer; Marine diesel engine; ORC; Hydrogen production; Waste heat recovery; Thermodynamic analysis
Categories
Funding
- National Natural Science Foundation of China [51706112]
- Natural Science Foundation of Zhejiang Province of China [LY20E060001]
- Natural Science Foundation of Ningbo, China [202003N4151]
- K. C. Wong Magna Fund in Ningbo University
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The study shows that integrating SOEC with marine diesel engines can achieve high-efficiency hydrogen production and waste heat recovery. Sensitivity analysis of key parameters such as current density, H2O flow rate, and SOEC area reveals optimal operating conditions.
Hydrogen is considered as a promising alternative to future energy systems. Water or steam electrolysis at elevated temperature consumes less electricity due to the highly efficient utilization of thermal energy. In this paper, a solid oxide electrolyzer cell (SOEC) is integrated with a marine diesel engine to use both electricity and waste heat for hydrogen production. An Organic Rankine Cycle (ORC) is applied to produce electricity from SOEC production streams. A comprehensive thermodynamic analysis model of SOEC, ORC and marine diesel engine waste heat recovery is conducted. The results indicated that the system could produce hydrogen at a rate of 0.431 kg/s and power output of 32386.45 kW with a power reduction of 60%. An efficiency of 104.41%, 12.12% and 53.56% could be achieved for the electrolyzer cell, ORC and integration system, respectively. The waste heat available efficiency could reach only 44.13% under the design conditions. To study the impact of some key parameters on the system performance, sensitivity analysis of current density, H2O inlet flow rate and total SOEC area were performed. It was found that an optimal current density and H2O flow rate can be obtained. Moreover, higher total cell area benefits the integration system thermodynamically.
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