The Oxy-CaL process: A novel CO 2 capture system by integrating partial oxy-combustion with the Calcium-Looping process

Abstract

This paper proposes a novel CO 2 capture technology from the integration of partial oxycombustion and the Calcium Looping capture process based on the multicycle carbonation/calcination of limestone derived CaO. The concentration of CO 2 in the carbonator reactor is increased by means of partial oxy-combustion, which enhances the multicycle CaO conversion according to Thermogravimetric analysis results carried out in our work, thus improving the CO 2 capture efficiency. On the other hand, energy consumption for partial oxycombustion is substantially reduced as compared to total oxy-combustion. All in all, process simulations indicate that the integration of both processes has potential advantages mainly regarding power plant flexibility whereas the overall energy penalty is not increased. Thus, the resulting energy consumption per kilogram of CO 2 avoided is kept below 4 MJ/kg CO 2 , which remains below the typical values reported for total oxy-combustion and amine based CO 2 capture systems whereas CO 2 capture efficiency is enhanced in comparison with the Calcium Looping process.

CO2-free coal-fired power generation by partial oxy-fuel and post-combustion CO2 capture: Techno-economic analysis

“…The main drawback for the large-scale deployment of oxy-combustion is the high energy consumption for pure O 2 production in the air separation unit (ASU), which causes a significant energy penalty [17].…”

“…The specific effect of O 2 enrichment in amine-based chemical absorption has been studied by Lawal et al [20,21], whereas Vega et al [19,22,23] have presented an experimental study on monoethanolamine (MEA) degradation in partial-oxy-combustion CO 2 capture. Other post-combustion CO 2 capture technologies, such as membranes [24,25], calcium looping [17] and cryogenic separation [26], have been considered for the potential application in partial oxy-combustion scheme. Unfortunately, a lack of publications on the effect of oxygen concentration on plant efficiency and economic performance in partial oxy-combustion CO 2 -free coal-fired power generation plants can be observed.…”

Supplied Oxygen Properties of NiO/NiAl2O4 in Chemical Looping Re-Forming of Biomass Pyrolysis Gas: The Influence of Synthesis Method

“…Therefore, the high value utilization of biomass pyrolysis gas is promising and urgent. At present, several technologies were considered as potential options for improving the value of biomass pyrolysis gas, such as chemical looping re-forming (CLR), steam re-forming, and so on. , CLR is a competitive option to produce H 2 as well as capturing CO 2 …”

Scaling-up the Calcium-Looping Process for CO₂ Capture and Energy Storage

“…Another option is to provide the heat for calcination in an indirect way through a heat transfer wall or heat pipes (Hanak and Manovic, 2017b). This option would avoid the need of oxy-fuel combustion, which contributes to most of the energy consumption in the CaL process (Ortiz et al, 2017b). On the other hand, heat transfer limitations are main challenges yet to be solved.…”