Solar thermochemical CO2 capture via calcium-oxide looping
This project seeks a major advancement of the solar thermochemical
CO2 capture technology via the calcination/carbonation
reaction pair as shown in Fig. 1. The calcination reaction is the solar,
endothermic step that proceeds at temperatures above 1200 K.
The carbonation reaction is the non-solar, exothermic step that proceeds
at temperatures below 600 K.
CO2 capture cycle based
1-kW solar reactor prototype for CO2 capture via
A 1 kW reactor to study the cycle is under development and is shown
in Fig. 2. It is a beam up reactor in which an annular reaction zone
containing a packed bed of particles is indirectly irradiated
by concentrated solar energy entering through a windowless aperture
into a cavity. Gases flow into the reactor through inlets into
a plenum before passing through a distributor plate into
the reaction zone. The gases flow through the reaction zone
and exit the reactor through outlets at the top.
The reactor is designed for batch operation,
where gas species are changed and solar input is switched on and off
to drive each reaction. Major research efforts in this project
include development of a transient heat and mass transfer model
of the reactor and design, construction, and experiments
using the reactor prototype.