Chemical looping combustion-adsorption of HCl-containing syngas using alkaline-earth coated iron ore composites for simultaneous purification and combustion enhancement

Liu, Guicai; Wang, Haiming; Veksha, Andrei; Giannis, Apostolos; Lisak, Grzegorz

doi:10.1016/j.cej.2021.129226

Cited by 29 publications

(4 citation statements)

References 45 publications

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“…Studies on effect of HCl on the Ca-based sorbent material confirmed the reaction between HCl and CaO to form CaClOH and, eventually, the end product of CaCl 2 [35][36][37][38][39][40][41]. Therefore, adding HCl to the carbonation step results in simultaneous carbonation and chlorination with the possible reactions of:…”

Section: Introductionmentioning

confidence: 88%

“…Understanding of the fundamental mechanism of interaction between HCl and CaO is important for developing sorbent formulas and optimising operation conditions. The adsorption of HCl by the CaO based sorbent is reported to be a reversible process with varying reaction temperatures, therefore, it is possible to desorb HCl and regenerate the sorbent by increasing the temperature through calcination [40]. In this regard, concentrations of the contaminants in the outlet gas streams during calcination were also examined, which is useful for reusing the captured CO 2 in plant nursery greenhouses.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Presence of HCl on Simultaneous CO2 Capture and Contaminants Removal from Simulated Biomass Gasification Producer Gas by CaO-Fe2O3 Sorbent in Calcium Looping Cycles

Dashtestani

Nusheh²,

Siriwongrungson

et al. 2021

Energies

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This study investigated the effect of HCl in biomass gasification producer gas on the CO2 capture efficiency and contaminants removal efficiency by CaO-Fe2O3 based sorbent material in the calcium looping process. Experiments were conducted in a fixed bed reactor to capture CO2 from the producer gas with the combined contaminants of HCl at 200 ppmv, H2S at 230 ppmv, and NH3 at 2300 ppmv. The results show that with presence of HCl in the feeding gas, sorbent reactivity for CO2 capture and contaminants removal was enhanced. The maximum CO2 capture was achieved at carbonation temperatures of 680 °C, with efficiencies of 93%, 92%, and 87%, respectively, for three carbonation-calcination cycles. At this carbonation temperature, the average contaminant removal efficiencies were 92.7% for HCl, 99% for NH3, and 94.7% for H2S. The outlet contaminant concentrations during the calcination process were also examined which is useful for CO2 reuse. The pore structure change of the used sorbent material suggests that the HCl in the feeding gas contributes to high CO2 capture efficiency and contaminants removal simultaneously.

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Effect of the Presence of HCl on Simultaneous CO2 Capture and Contaminants Removal from Simulated Biomass Gasification Producer Gas by CaO-Fe2O3 Sorbent in Calcium Looping Cycles

Dashtestani

Nusheh²,

Siriwongrungson

et al. 2021

Energies

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“…To achieve carbon reduction as well as the control of rising global temperature, it is necessary to search for a more efficient and low-cost CO 2 capture technology . In recent years, chemical looping combustion (CLC), a promising clean combustion technology, has provided a new route for efficient energy conversion. , During the CLC process, fuel conversion is achieved by two independent reactions of reduction and oxidation (Figure ). An oxygen carrier (OC) is used to transport the lattice oxygen needed for fuel combustion and then recovered by direct air oxidation.…”

Section: Introductionmentioning

confidence: 99%

Reduction Kinetics of Low-Cost Cu/Fe-Based Oxygen Carriers in Chemical Looping Mode

Li,

Wang,

Liu

et al. 2023

Energy Fuels

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Cu–Fe bimetallic oxides have been proposed as promising OC candidates in chemical looping combustion (CLC) due to their high reactivity and resistance to sintering, and the reduction kinetics of the Cu–Fe composite OCs is significantly essential. In this article, several low-cost Cu/Fe-based OCs are prepared using fine natural ores or red mud as raw materials. Among these OCs, the composite OC with thermal neutrality is determined by reduction investigation within the typical CLC temperature range. The heat flow curves indicate that the autothermal balance could be achieved when the mixing ratio of copper ore to hematite is 20:80 (i.e., Cu20Fe80@C), which further guides the design of the copper ore/red mud composite OC (i.e., Cu10.9Red89.1@C). Subsequently, 50 cyclic redox tests are performed to evaluate the reaction stability of these OCs, and the results show that the composite OCs (i.e., Cu20Fe80@C and Cu10.9Red89.1@C) exhibit a better cyclic stability as well as a higher oxygen transfer rate than those of pure Fe-based materials (i.e., red mud and Fe100@C). Moreover, the reduction kinetics of these OCs is studied in detail at both high- and low-temperature conditions. It is found that the OC reduction data obtained from high temperatures (750–950 °C) are inappropriate for analyzing the kinetic parameters, whose process is likely to be dominated by gas diffusion in the particle boundary layer. At low temperatures (400–610 °C), the reduction of all targeted OCs can be described by the shrinking core model, and the pure Fe-based OCs correspond to the mechanism function of G(X) = 1 – (1 – X)1/3, while that is G(X) = 1 – (1 – X)1/2 for the composite OCs. Additionally, it should be noted that the composite OCs present lower activation energy than their corresponding pure Fe-based OCs. In summary, this study shows the superiority of composite OCs in terms of cyclic reactivity and kinetic parameters, which will further guide and optimize the design of low-cost OCs.

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“…Subsequently, CaO/K 2 O/Na 2 O was loaded onto iron-based OCs to achieve a maximum HCl removal efficiency of 80% . Then, CaO/K 2 O/Na 2 O was loaded onto natural iron ore (IO) OCs to achieve a HCl removal efficiency of greater than 90%, along with an AAEM conversion rate of almost 100% for the IO OCs modified with K 2 O/Na 2 O. , In addition, Ba/Sr have been used to modify the IO OCs and achieve HCl removal efficiencies of 95–96%, − with the added advantage that the dechlorination agents could be regenerated and reused. To further reduce the cost, witherite (BaCO 3 ) has been mixed with natural IO for dechlorination during CL, after which the witherite particles could be separated and the IO particles reloaded into the CL process.…”

Section: Introductionmentioning

confidence: 99%

Dechlorination Performance of Chemical Looping Conversion Using Red Mud as an Oxygen Carrier

Jiang

Chen

et al. 2022

Energy Fuels

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Chemical looping (CL) conversion is a fuel heat utilization technology with CO2 capture and pollution control capability. During the treatment of Cl-containing organic solid waste, a large amount of HCl is generated, along with highly toxic polychlorinated dibenzo-p-dioxins and polychlorinated dibenzo-p-furans, thereby resulting in serious equipment corrosion and environmental harm. Red mud (RM) produced by the alumina industry is a potential cheap oxygen carrier (OC) with in situ dechlorination capability. In this paper, three types of RM are selected to study the evolution and varieties of Na- and Ca-containing compounds in the process of OC preparation and dechlorination. The dechlorination mechanisms and performances of the RM OCs under various reaction conditions are discussed. The results verify that the Na- and Na/Ca-rich RM OCs exhibit good dechlorination performances at a high reaction temperature. The RM OC components with dechlorination activity include Na in the form of soluble alkali (e.g., NaOH), Na2Ti3O7, and Na6Al4Si4O17, along with Ca in the form of CaO, Ca2SiO4, and CaTiO3, whereas NaAlSiO4, Na1.15(Al1.15Si0.85O4), and Ca2Al2SiO7 are inert. The dechlorination performances of the RM OCs are inhibited by the presence of water vapor and high temperature. In the dechlorination process using RM OCs, HCl first reacts rapidly with active elements on the surface of the OC with high dechlorination efficiency. With the saturation of surface-active elements, the reaction enters the HCl diffusion control stage, when the appropriate particle size of the OC and the gas residence time are helpful for improving the dechlorination efficiency.

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Chemical looping combustion-adsorption of HCl-containing syngas using alkaline-earth coated iron ore composites for simultaneous purification and combustion enhancement

Cited by 29 publications

References 45 publications

Effect of the Presence of HCl on Simultaneous CO2 Capture and Contaminants Removal from Simulated Biomass Gasification Producer Gas by CaO-Fe2O3 Sorbent in Calcium Looping Cycles

Effect of the Presence of HCl on Simultaneous CO2 Capture and Contaminants Removal from Simulated Biomass Gasification Producer Gas by CaO-Fe2O3 Sorbent in Calcium Looping Cycles

Reduction Kinetics of Low-Cost Cu/Fe-Based Oxygen Carriers in Chemical Looping Mode

Dechlorination Performance of Chemical Looping Conversion Using Red Mud as an Oxygen Carrier

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