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This content will become publicly available on January 11, 2019

Title: Simulation of high temperature thermal energy storage system based on coupled metal hydrides for solar driven steam power plants

Concentrating solar power plants can achieve low cost and efficient renewable electricity production if equipped with adequate thermal energy storage systems. Metal hydride based thermal energy storage systems are appealing candidates due to their demonstrated potential for very high volumetric energy densities, high exergetic efficiencies, and low costs. The feasibility and performance of a thermal energy storage system based on NaMgH 2F hydride paired with TiCr 1.6Mn 0.2 is examined, discussing its integration with a solar-driven ultra-supercritical steam power plant. The simulated storage system is based on a laboratory-scale experimental apparatus. It is analyzed using a detailed transport model accounting for the thermochemical hydrogen absorption and desorption reactions, including kinetics expressions adequate for the current metal hydride system. The results show that the proposed metal hydride pair can suitably be integrated with a high temperature steam power plant. The thermal energy storage system achieves output energy densities of 226 kWh/m 3, 9 times the DOE SunShot target, with moderate temperature and pressure swings. Also, simulations indicate that there is significant scope for performance improvement via heat-transfer enhancement strategies.
Authors:
 [1] ;  [2] ;  [1] ;  [1]
  1. Savannah River Site (SRS), Aiken, SC (United States)
  2. Savannah River Site (SRS), Aiken, SC (United States); Greenway Energy LLC, Aiken, SC (United States)
Publication Date:
Report Number(s):
SRNL-STI-2018-00040
Journal ID: ISSN 0360-3199; PII: S0360319917344804
Grant/Contract Number:
DE-AC09-08SR22470
Type:
Accepted Manuscript
Journal Name:
International Journal of Hydrogen Energy
Additional Journal Information:
Journal Volume: 43; Journal Issue: 2; Journal ID: ISSN 0360-3199
Publisher:
Elsevier
Research Org:
Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S); Curtin Univ., Perth (Australia)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 25 ENERGY STORAGE; 54 ENVIRONMENTAL SCIENCES; Solar power plants; Transport models; Metal hydrides; Thermal energy storage; Hydrogen storage; High temperature
OSTI Identifier:
1426658