Calcium oxide can be an effective sorbent to separate CO2 at high temperatures. When coupled with a calcination step produce pure CO2, the carbonation reaction is basis for several high-temperature capture systems. The evolution cycling of capacity CaO derived from natural limestones experimentally investigated in this work. Long series carbonation/calcination cycles (up 500) varying different variables affecting have been tested thermogravimetric apparatus. Calcination temperatures above T...

This paper presents the basic economics of an emerging concept for CO2 capture from flue gases in power plants. The complete system includes three key cost components: a full combustion plant, second plant working as oxy-fired fluidized bed calciner, and carbonator interconnected with calciner capturing plant. simplicity economic analysis is possible because data two major first components are well established open literature. It shown that there clear scope breakthrough to around 15 $/t...

Abstract Calcium oxide has been proved to be a suitable sorbent for high temperature CO 2 capture processes based on the cyclic carbonation‐calcination reaction. It is important have reaction rate models that are able describe behavior of CaO particles with respect carbonation Fresh calcined lime known reactive solid toward carbonation, but average particle in CaO‐based system experiences many cycles and reactivity changes number cycles. This study applies random pore model (RPM) estimate...

This paper presents a new solids looping process for capturing CO2 while generating hydrogen and/or electricity from natural gas. The is based on the sorption enhanced reforming of CH4, employing CaO as high temperature sorbent, combined with second chemical loop CuO/Cu. exothermic reduction CuO CH4 used to obtain heat necessary decomposition CaCO3 formed in step. main part completed by oxidation Cu CuO, which carried out air diluted product gas recycle this reactor at sufficiently low...

Post-combustion CO2 capture based on the Ca-looping process (CaL) is a promising technology under development reversible reaction between CaO and to form CaCO3 regeneration of by calcination in rich atmosphere. This work focused study kinetics with typical solid conditions expected these systems. Calcination rates carbonated materials derived from two limestones have been measured at different numbers carbonation–calcination cycles, as function temperature partial pressure. It has observed...

The influence of thermal pretreatment on the performance a high-purity limestone (La Blanca) during CO2 capture cycles is investigated in this paper. This was chosen for more detailed investigation because, earlier research, it failed to show any favorable effect as result pretreatment. Here, original sample, with particle size 0.4−0.6 mm, and ground samples were thermally pretreated at 1000−1200 °C, 6−24 h, then subjected several carbonation/calcination thermogravimetric analyzer (TGA)....

This paper presents a novel sorbent regeneration technique for post-combustion calcium looping CO2 capture systems. The advantage of this is that it can drastically reduce the consumption limestone in plant without affecting its efficiency and need additional reagents. method based on re-carbonation carbonated particles circulating from carbonator using pure obtained gas stream generated calciner. aim to maintain carrying capacity close optimum values CaL systems (around 0.2). achieved by...

Postcombustion CO2 capture using CaO requires a large scale circulating fluidized bed (CFB) reactor as absorber, operating between 600–700 °C. In addition, oxy-fired CFBC must be interconnected to this allow for the decomposition of CaCO3 formed in carbonator. This allows continuous regeneration sorbent and production rich stream suitable final purification compression. Despite known limitations associated technology (mainly deactivation, solid attrition, high energy requirements calciner)...

Postcombustion CO2 capture using calcium looping (CaL) is a rapidly developing technology based on the reaction between CaO and CO2. The influence of presence steam in flue gas carbonation has been barely studied literature. Experiments thermogravimetric analyzer (TGA) were carried out to study effect over very short time where takes place under kinetic-controlled regime. A simple particle model applied interpret results obtained derive rate constants support quantitative discussion effects....

This work investigates the kinetics of reaction CO2 with CaO particles partially carbonated that are forced to increase their carbonate content at high temperatures in an atmosphere rich CO2. additional recarbonation on have already completed fast carbonation stage is basis a novel process aims carrying capacity sorbents calcium looping capture systems. The rates and maximum conversions after step were measured thermogravimetric analyzer, results indicate they highly dependent upon...

A syngas production method is investigated that combines in a single reactor the enhanced decomposition of CaCO3 with H2 and reverse water–gas shift (RWGS) part CO2 evolved during calcination. The exploits Le Chatelier's principle, to overcome RWGS equilibrium limitations by conducting such reactions an excess at sufficiently high temperatures maintain partial pressure close calcination equilibrium. result 'desorption-enhanced shift' (DERWGS) on H2, observed experiments performed packed-bed...

CaO is being proposed as a regenerable sorbent of CO{sub 2} via carbonation/calcination loop. It well known that natural sorbents lose their capacity to capture with the number cycles due textural degradation. In coal combustion systems, reaction SO{sub present in flue gases also causes deactivation. This work investigates effect partial sulfation on amount used systems where both carbonation and reactions are competing. We have found reacts deactivated resulting from repetitive...

Abstract This work analyses a Ca looping system that uses CaO as regenerable sorbent to capture CO 2 from the flue gases generated in power plants. The is captured by CFB carbonator while coal oxycombustion provides energy required regenerate sorbent. Part of introduced into calciner can be transferred new supercritical steam cycle generate additional power. Several case studies have been integrated with this cycle. Efficiency penalties, mainly associated consumption ASU, compressor and...

Several concepts to capture CO2 in power plants and hydrogen generation are under development using CaO as regenerable sorbent. The drastic decay sorbent capacity of obtained through calcination natural sources CaCO3 (limestones or dolomites) justifies the search synthetic sorbents that aim overcome this capacity. We have reviewed some recent literature on subject tested proposed comparable conditions. Our results confirm good performance these mild conditions and/or long carbonation times...