Study of the calcination of CaCO3 by means of a Cu/CuO chemical loop using methane as fuel gas

Fernández, José R.; Alarcón, Juana M.; Abanades, J.C.

doi:10.1016/j.cattod.2018.02.053

Cited by 16 publications

(12 citation statements)

References 47 publications

(54 reference statements)

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“…The reaction front reaches last portion of the bed in about five minutes, (see Figure 4 e) and at the same time the break-through of the reducing gases takes place (see Figure 4 b). As it can be observed the break-through of the CH 4 is slower than for CO and H 2 , in agreement with results presented in the literature [21]. It is also observed that the CO concentration in the breakthrough of the gases exceeds the concentration introduced in the system for a few minutes, this might indicate that side reactions as CH 4 thermal decomposition together with water gas reaction could be taking place while there is steam in the reactor produced by the oxidation reactions of H 2 , and CH 4 .…”

Section: Resultssupporting

confidence: 93%

Experimental investigation of the Ca-Cu process for H2 production: Evaluation of reduction/calcination strategies

Díez-Martín

López

Martínez

et al. 2019

International Journal of Greenhouse Gas Control

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The exothermic reduction of the CuO present in a bed of solids (39 % wt. CuO, 20 % wt. CaCO3 and 1.5 % wt. Ni, being the rest inert materials) with a fuel gas, generated a pure CO2 stream once steam was condensed (and free of N2). In this way, a Cu/Ca molar ratio of approximately 2 in the bed of solids allowed for CaCO3 calcination efficiencies of around 95 % molar basis at the reducing gases break-through. This allowed performing consecutive cycles of the main reaction steps involved in the Ca/Cu H2 production process. The mixture CaO-based sorbent, reforming catalyst and Cu-based material was able to produce a gas stream with a 94.0 % vol. H2 at 10 bar during the CH4 sorption enhanced reforming stage. The Cu-based material was oxidized with a highly diluted air stream at 10 bar, reacting in a well defined reaction front. A pure CO2 gas stream was obtained at reactor exit during the calcination/reduction stage with a fuel gas typical composition of a SMR stage at high temperature. The experimental results indicated that it was possible to cool the bed and to produce a syngas with a H2/CO molar ratio of about 3.5 suitable for its use in the calcination/reduction stage, in a SMR stage at high temperature. It was also possible to perform the calcination/reduction and SMR in one single stage.

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Section: Resultssupporting

confidence: 93%

Experimental investigation of the Ca-Cu process for H2 production: Evaluation of reduction/calcination strategies

Díez-Martín

López

Martínez

et al. 2019

International Journal of Greenhouse Gas Control

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“…This process is receiving increased interest due to the predicted high energy efficiency and lower product costs compared to benchmarking CO2 capture technologies [164]. Experimental development studies were completed, mainly focusing on the Ca-Cu material and its performance, testing under the main critical step of the process which combines reduction of CuO and calcination CaCO3 [165][166][167]. A recent review by Fernández et al [168] on the technology provides a complete overview of the progress both on process development, modelling and integration.…”

Section: Discussion Of Techno-economic Assessment Findingsmentioning

confidence: 99%

Review of pressurized chemical looping processes for power generation and chemical production with integrated CO2 capture

Osman

Khan

Zaabout

et al. 2021

Fuel Processing Technology

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Chemical looping has great potential for reducing the energy penalty and associated costs of CO2 capture from fossil fuel-based power and chemical production while maintaining high efficiency. However, pressurized operation is a prerequisite for maximizing energy efficiency in most proposed chemical looping configurations, introducing significant complexities related to system design, operation and scale-up. Understanding the effects of pressurization on chemical looping systems is therefore important for realizing the expected cost reduction of CO2 capture and speed up the industrial deployment of this promising class of technologies.This paper reviews studies that investigated three key aspects associated with pressurized operation of chemical looping processes. First, the effect of pressure on the kinetics of the various reactions involved in these processes was discussed. Second, the different reactor configurations proposed for chemical looping were discussed in detail, focusing on their suitability for pressurized operation and highlighting potential technical challenges that may hinder successful operation and scale-up. Third, techno-economic assessment studies for these systems were reviewed, identifying the process configuration and integration options that maximize the energy efficiency and minimize the costs of CO2 avoidance.Prominent conclusions from the review include the following. First, the frequently reported negative effect of pressure on reaction kinetics appears to be overstated, implying that pressurization is an effective way to intensify chemical looping processes. Second, no clear winner could be identified from the six pressurized chemical looping reactor configurations

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“…These oxides carbonated in the presence of CO 2 , affecting the CO 2 sorption capacity of the solid bed. Recently, Fernández et al [47] studied the reduction/ calcination stage using pure CH 4 as reducing gas. The effect of the initial bed temperature and the inlet gas flow rate was evaluated.…”

Section: Ca-cu Process Lab-scale Testingmentioning

confidence: 99%

Ca-Cu Chemical Looping Process for Hydrogen and/or Power Production

Martínez¹,

Fernández²,

Grasa³

2020

Global Warming and Climate Change

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It has been widely reckoned the potential of developing novel CO 2 capture technologies aiming at low-energy penalties and reduced cost as a solution for fighting against climate change. The Ca-Cu chemical looping process emerged as a promising technology for producing hydrogen and/or power with inherently low CO 2 emissions. The core of this concept is the calcination of the CaCO 3 by coupling in the same solid bed the exothermic reduction of a CuO-based material, improving the efficiency of the CO 2 sorbent regeneration step. Significant progress has been made since its first description in 2009, fulfilling the validation of the key stage under relevant conditions for the process in 2016. This chapter compiles the main advances in the Ca-Cu process regarding material development, reactor and process design and lab-scale testing, as well as in process simulation at large scale.

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Study of the calcination of CaCO3 by means of a Cu/CuO chemical loop using methane as fuel gas

Cited by 16 publications

References 47 publications

Experimental investigation of the Ca-Cu process for H2 production: Evaluation of reduction/calcination strategies

Experimental investigation of the Ca-Cu process for H2 production: Evaluation of reduction/calcination strategies

Review of pressurized chemical looping processes for power generation and chemical production with integrated CO2 capture

Ca-Cu Chemical Looping Process for Hydrogen and/or Power Production

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