Design and energy evaluation of a stand-alone copper-chlorine (Cu-Cl) thermochemical cycle system for trigeneration of electricity, hydrogen, and oxygen

Wei Wu, Fu Teng Hsu, Han Yu Chen

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

In this article, a new stand-alone Cu-Cl cycle system (SACuCl) for trigeneration of electricity, hydrogen, and oxygen using a combination of a specific combined heat and power (CHP) unit and a 2-step Cu-Cl cycle using a CuCl/HCl electrolyzer is presented. Based on the self-heat recuperation technology for the CHP unit and the heat integration of the Cu-Cl cycle unit, the power efficiency of the SACuCl for 5 prescribed scenarios (case studies) is predicted to achieve about 48% at least. The SACuCl uses the technologies of the dry reforming of methane and the oxy-fuel combustion to achieve a relatively high CO2 concentration in the flue gas, and CO2 emissions for power generation could be almost restricted by 0.418 kg/kWh. From the aspect of the electricity required for hydrogen production, it is verified that the 2-step Cu-Cl cycle system is superior to the conventional water electrolyzer because the CHP process supplies the heat/electricity for Cu-Cl thermochemical reactions and a thermoelectric generator is connected to the exhaust gas for recovering the power consumption from the compressor and the CuCl/HCl electrolyzer. Finally, the heat exchanger network and the pinch technology are employed to determine the optimum heat recovery of the Cu-Cl cycle. In case 5 analyzed for the SACuCl, the electricity required for the heat-integrated 2-step Cu-Cl cycle is predicted to dramatically decrease from 4.39 to 0.452 kWh/m3 H2 and the cycle energy efficiency could be obviously increased from 23.77 to 31.97%.

Original languageEnglish
Pages (from-to)830-842
Number of pages13
JournalInternational Journal of Energy Research
Volume42
Issue number2
DOIs
Publication statusPublished - 2018 Feb 1

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

Fingerprint Dive into the research topics of 'Design and energy evaluation of a stand-alone copper-chlorine (Cu-Cl) thermochemical cycle system for trigeneration of electricity, hydrogen, and oxygen'. Together they form a unique fingerprint.

Cite this