Thermal energy storage via manganese-oxide based
Solar radiation is highly intermittent and its use for demand-sensitive
electricity generation requires energy storage. Storing large amounts
of solar-produced electricity is challenging and has been a highly sought
after goal. High-temperature solar thermal energy storage can be deployed
as an alternative enabling technology for matching solar radiation
availability and electricity demand.
This project aims at developing a novel high-temperature thermochemical
energy storage syst em for dispatchable and efficient concentrating solar
power generation via combined power cycles. The proposed approach is based
on the manganese-oxide redox cycle in a system involving two
fluidised-bed reactors (Fig. 1), one for solar-driven
high-temperature endothermic reduction and one for non-solar
lower-temperature exothermic oxidation.
We will develop stable and durable redox materials promising high reaction
rates, and development of a solar reduction reactor prototype promising
high efficiency. The solar reactor is a novel beam-up concept that allows
for suppression of convective heat losses from a down-facing receiver
cavity, effective and well-controlled fluidisation of the redox material
due to a symmetric vertical orientation, and high optical efficiency
due to the symmetric field layout around the receiver.
Solar thermochemical energy storage system using manganese-oxide
based redox cycling
The proposed technology allows for higher operating temperatures,
and thus higher efficiencies of the power cycle,
compared to non-thermochemical storage systems.
It has the potential for efficient and fast-response high-energy density
storage in the solid oxide material.