Improved Flexibility and Economics of Calcium Looping Power Plants by Thermochemical Energy Storage

6 Pages Posted: 15 Apr 2019 Last revised: 15 May 2019

See all articles by Marco Astolfi

Marco Astolfi

affiliation not provided to SSRN

Edoardo De Lena

Nagoya University

Matteo Carmelo Romano

Polytechnic University of Milan - Department of Energy

Date Written: October 21, 2018

Abstract

In this work, an advanced Calcium looping (CaL) power plant with thermochemical energy storage system is assessed. The CaL system is equipped with two solids storage silos storing calcined solids from the calciner and carbonated solids from the carbonator. The presence of the solids storage allows to design the CaL calciner line (calciner, ASU, CPU) on the average load of the power plant, while the carbonator can follow the load of the conventional power plant with air-blown boiler.

Preliminary economic optimization of the system has been performed for a specific case with power plant with weekday capacity factor of 76%, showing that: (i) significant saving (about 20%) of the capital cost of the calciner line can be achieved thanks to the storage system, resulting in a reduction of the total plant Capex of about 5%; (ii) the economic optimal design leads to large storage silos and calciner sized on the average plant load; (iii) reduction of the cost of electricity by almost 3% has been estimated for the best case compared to the baseline CaL case without storage, which can improve if production plan with lower capacity factor is expected.

The full paper with final results is now available on the International Journal of Greenhouse Gas Control, Volume 83, April 2019, Pages 140-155.

Keywords: High temperature solids looping: calcium looping, GHGT-14

Suggested Citation

Astolfi, Marco and De Lena, Edoardo and Romano, Matteo Carmelo, Improved Flexibility and Economics of Calcium Looping Power Plants by Thermochemical Energy Storage (October 21, 2018). 14th Greenhouse Gas Control Technologies Conference Melbourne 21-26 October 2018 (GHGT-14) . Available at SSRN: https://ssrn.com/abstract=3365846

Marco Astolfi

affiliation not provided to SSRN

No Address Available

Edoardo De Lena

Nagoya University

Matteo Carmelo Romano (Contact Author)

Polytechnic University of Milan - Department of Energy ( email )

via Lambruschini 4
Milan, 20156
Italy

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