Improved Flexibility and Economics of Calcium Looping Power Plants by Thermochemical Energy Storage
6 Pages Posted: 15 Apr 2019 Last revised: 15 May 2019
Date Written: October 21, 2018
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
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