Effect of the CaO sintering on the calcination rate of CaCO3 under atmospheres containing CO2

Maya, Juan C.; Janna, Farid Chejne; Gómez, Carlos; Bhatia, Suresh K.

doi:10.1002/aic.16326

Cited by 48 publications

(17 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The high enthalpy of the reaction and the high reaction temperature involves supplying a high amount of energy to the calciner, which can be satisfied by means of oxy-combustion to ensure an almost pure CO 2 stream at the calciner exit ready to be compressed and stored or reused. An important issue to be considered under these harsh calcination conditions is the enhanced CaO sintering, which negatively affects CaO conversion at the carbonator (Maya et al, 2018). To decrease the calcination temperature down to around 725 °C (Valverde and Medina, 2016), the CO 2 partial pressure should be reduced by introducing a certain amount of inert gas in the reactor such as steam or helium (Berger, 1927) that should be separable from CO 2 .…”

Section: Calcinermentioning

confidence: 99%

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

Ortíz

Chacartegui

Pérez‐Maqueda

et al. 2021

KONA

View full text Add to dashboard Cite

The Calcium-Looping (CaL) process has emerged in the last years as a promising technology to face two key challenges within the future energy scenario: energy storage in renewable energy-based plants and CO 2 capture from fossil fuel combustion. Based on the multicycle calcination-carbonation reaction of CaCO 3 for both thermochemical energy storage and post-combustion CO 2 capture applications, the operating conditions for each application may involve remarkably different characteristics regarding kinetics, heat transfer and material multicycle activity performance. The novelty and urgency of developing these applications demand an important effort to overcome serious issues, most of them related to gas-solids reactions and material handling. This work reviews the latest results from international research projects including a critical assessment of the technology needed to scale up the process. A set of equipment and methods already proved as well as those requiring further demonstration are discussed. An emphasis is put on critical equipment such as gas-solids reactors for both calcination and carbonation, power block integration, gas and solids conveying systems and auxiliary equipment for both energy storage and CO 2 capture CaL applications.

show abstract

Section: Calcinermentioning

confidence: 99%

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

Ortíz

Chacartegui

Pérez‐Maqueda

et al. 2021

KONA

View full text Add to dashboard Cite

show abstract

“…properties (e.g. crystallite size, surface area, porosity) of the nascent CaO, which in turn determine its subsequent sorption properties for CO2 [148], [152]- [154]; this is elaborated in Section 2.5.1. On a plant level, the high endothermicity of the calcination reaction requires the co-combustion of a fuel, e.g.…”

Section: Cao-caco3 System (Calcite)mentioning

confidence: 99%

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

Dunstan¹,

Donat²,

Bork³

et al. 2021

Preprint

View full text Add to dashboard Cite

Carbon dioxide capture and mitigation forms a key part of the technological response to combat climate change and reduce CO2 emissions. Solid materials capable of reversibly absorbing CO2 have been the focus of intense research for the past two decades, promising stability and low energy costs to implement and operate compared to the more widely used liquid amines. In this Review, we explore the fundamental aspects underpinning solid CO2 sorbents based on alkali and alkaline earth metal oxides operating at mid- to high temperature: how their structure, chemical composition and morphology impact their performance and long-term use. Various optimization strategies are outlined to improve upon the most promising materials, and we combine recent advances across disparate scientific disciplines including materials discovery, synthesis, and in situ characterization to present a coherent understanding of the mechanisms of CO2 absorption both at surfaces and within solid materials.

show abstract

“…During the high-temperature calcination stage in the CaL, however, it is found that the calcium carbonate suffers to sinter due to its low Tammann temperature. As a result, a layer of the dense structure is formed on the solid adsorbent surface, which causes the difficulty of carbon dioxide diffusing in the solid adsorbent − and then results in the degradation of adsorbent performance.…”

Section: Introductionmentioning

confidence: 99%

Influence of Vacancy Defect of Calcium Oxide Surface on the Wettability of Molten Alkali Metal Salt in Calcium Looping Process

et al. 2021

View full text Add to dashboard Cite

The influence of the vacancy defect of the CaO surface on the wettability of molten alkali metal salt was studied by molecular dynamics simulations. The results indicated that in the temperature range of 800–1100 K, the molten Na2SO4 on both VDcalcium and VDoxygen defect surfaces presented a poor wettability compared to that on the complete surface. Measurement of the density profile and the contact angle of the molten Na2SO4 showed that the higher the temperature and defect concentration, the worse the wettability. The micromechanism was revealed by calculating the polarization intensity that the vacancy defect surface led to the formation of the induced dipole moment in the molten Na2SO4. Induced polarization caused by defect surfaces reduces the wettability of Na2SO4. More importantly, as the temperature and defect concentration increase, various defect surfaces form loose and local weak liquidity structures. These structures are beneficial for the diffusion of carbon dioxide into the solid, but the reduction in the spreading area caused by poor wettability causes the efficiency of the CaL to decline. The vibration difference between Na2SO4 and CaO increases with the increased temperature and defect concentration. This means that the thermal energy transportability at the interface is suppressed by poor wettability.

show abstract

Effect of the CaO sintering on the calcination rate of CaCO₃ under atmospheres containing CO₂

Cited by 48 publications

References 41 publications

Scaling-up the Calcium-Looping Process for CO<sub>2</sub> Capture and Energy Storage

Scaling-up the Calcium-Looping Process for CO<sub>2</sub> Capture and Energy Storage

CO2 capture using solid sorbents: Fundamental aspects, mechanistic insights and recent advances

Influence of Vacancy Defect of Calcium Oxide Surface on the Wettability of Molten Alkali Metal Salt in Calcium Looping Process

Contact Info

Product

Resources

About