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Performance investigation of an electrochemical ammonia compressor stack.

Author(s) : BAKER J., CAO L., HWANG Y., WANG C., RADERMACHER R.

Type of article: IJR article

Summary

Electrochemical (EC) energy conversion has a critical role to play in the future of clean energy. As the world transitions away from fossil fuel energy sources, EC compression emerges as a promising technique for energy storage, specifically energy stored in the form of pressurized ammonia. The present study examines the performance of an ammonia EC compressor stack under steady-state operating conditions to demonstrate the technology’s utility in such applications. Using hydrogen as a carrier gas, we examined the effect of pressure and current on the operation of an EC ammonia compressor stack. We found the total voltage increased significantly with increasing current but increased marginally with increasing pressure. We measured the flow rate leaving the cell and analyzed the composition of the effluent gas stream with gas chromatography. While the device provided useful compression work in all observed cases, back diffusion of ammonia hampered the performance, reducing the flow rate of the effluent fluid by as much as 67%. The maximum observed single-cell efficiency was 40% with respect to ideal isentropic compression. The ohmic losses associated with high current and the back diffusion effect are likely responsible for the low cell efficiency.

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Pages: 67-77

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Details

  • Original title: Performance investigation of an electrochemical ammonia compressor stack.
  • Record ID : 30031957
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 153
  • Publication date: 2023/09
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2023.05.020

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