Volume 31: Clean Energy Technologies towards Carbon Neutrality

CO2 Capture for Low Temperature Heat Utilization Based on Advanced Coconut Shell Biochar Y. Ji, C. Zhang, X.J. Zhang, C. Wu, L. Jiang

Abstract

In view of burgeoning carbon dioxide (CO2) emission, adsorption post-combustion capture technology has drawn more attention. As the most critical part of capture technology, the selectivity of adsorbents with superb performance and appropriate economic benefit becomes a study hot button. Therefore, a new commercial biomass-derived activated carbon, i.e. coconut shell (CS), is developed, investigating the effects of adsorption and desorption temperatures for practical applications. Also, a solar-assisted coal-fired power plant integrated with temperature swing adsorption process is initially proposed for techno-economic assessment. Results show that CS has an excellent low-temperature adsorption capacity (1.19 mmol·g-1 at 0 ℃) and a relatively low desorption temperature (1.13 mmol·g-1 at 80 ℃). Compared with the system using monoethanolamine and zeolite 13X, carbon emission intensity, levelized cost of electricity and cost of CO2 removed of the system using CS always show the best performances, corresponding to 93.19 g·kWh-1, 62.32 USD·MWh-1 and 18.67 USD·tonCO2-1, respectively. CS may be a potential solution for carbon capture with low capital costs, low regeneration temperatures and high adsorption capacities.

Keywords Coconut shell, High adsorption capacity, Low regeneration temperature, Solar energy