Estimation of effective thermal conductivity and heat transfer coefficient of lithium orthosilicate pebble bed in carbon dioxide-air medium

Lithium orthosilicate has the highest absorption capacity among other materials used to capture carbon dioxide (CO2) at a higher temperature. To design a CO2 adsorption system consisting of lithium orthosilicate pebble bed, effective thermal conductivity and heat transfer coefficient data are necessary, and till date, these are not reported in the literature. In the present study, experiments were conducted to estimate the effective thermal conductivity and heat transfer coefficient of lithium orthosilicate pebble bed in CO2-air medium. Effects of CO2 concentration in air, bed temperature, and gas flowrate on the hydrodynamic as well as heat transfer properties of the pebble bed of lithium orthosilicate pebbles were also studied. The effective thermal conductivity and heat transfer coefficients were found in the range of 0.2-0.75 Wm(-1)K(-1) and 14-63 Wm(-2)K(-1), respectively.

Automated summary

The effective thermal conductivity and heat transfer coefficients of lithium orthosilicate pebble bed in a CO2-air medium were investigated. The results showed that the effective thermal conductivity ranged from 0.2 to 0.75 Wm(-1)K(-1), and the heat transfer coefficients ranged from 14 to 63 Wm(-2)K(-1).