Preparation of Blackened Ca-based Composite Particles and Their
Carbonation Kinetics Features
Abstract
The calcium looping thermochemical thermal energy storage is one of the
best high-temperature heat storage schemes for 3th concentrating solar
power photothermal power, but its application is restricted by the
inherent low solar absorptance and poor cyclic stability of CaCO3/CaO.
Herein, the solar absorptance of CaCO3 particles is enhanced by doping
Mn-Fe oxides, meanwhile, awns of setaria faberis and microcrystalline
cellulose are used as bio-templates to generate pores inside the
particles. The test results show that the prepared particles possess
adequate anti-crushing strength, high cyclic stability, high solar
absorption, and high carbonation rate. In addition, the carbonation
kinetic equation of the composite porous particles is studied with the
influence factors such as CO2 partial pressure, reaction temperature,
and particle morphology taken into consideration. is of great
significance for the design and regulation of the carbonator achieving
highly stable heat output in the CaL thermochemical heat storage system.