Chemical looping based co-combustion of high ash Indian coal and rice straw operating under CO2 in-situ gasification mode

Bhui, Barnali; Prabu,

doi:10.1016/j.joei.2020.07.004

Cited by 17 publications

(6 citation statements)

References 31 publications

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“…In general, ilmenite seems to have less affinity with biomass ash than other Fe oxides. Indeed, ilmenite does not present any interaction with CaCO 3 , unlike hematite or other iron ores which tend to react with Ca producing calcium ferrites, in particular under reducing environments. ,, Also tests carried out on LD-slag as OC, a waste material produced in the Linz–Donawitz process, with K 2 SO 4 and K 2 CO 3 entailed an erichment of K-based compounds in the OC, but without relevant variation in the reactivity …”

Section: Role Of Biomass Ash and The Fate Of Alkalimentioning

confidence: 99%

“…When this optimum value is exceeded, some foreign ions (K and Na) in the ash interacted with aluminosilicates to form species with low melting points, covering the surface of Fe 2 O 3 particles. These findings were also confirmed by the experimental campaigns of Zang and Bhui who detected an improvement of the performance of iron ore and Fe 2 O 3 respectively in tests of bio-CLC.…”

Section: Role Of Biomass Ash and The Fate Of Alkalimentioning

confidence: 99%

“…Indeed, ilmenite does not present any interaction with CaCO 3 , unlike hematite or other iron ores which tend to react with Ca producing calcium ferrites, in particular under reducing environments. 90,94,99 Also tests carried out on LDslag as OC, a waste material produced in the Linz−Donawitz process, with K 2 SO 4 and K 2 CO 3 entailed an erichment of Kbased compounds in the OC, but without relevant variation in the reactivity. 97 However, the coexistence of K and P can turn the tables, in particular the presence of KH 2 PO 4 seems to have a massive effect on the Fe-based OCs: all authors detected a possible loss of reactivity combined with the occurrence of agglomeration and consequent defluidization.…”

Section: ■ Oxygen Carriersmentioning

confidence: 99%

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Chemical Looping for Combustion of Solid Biomass: A Review

Coppola¹,

Scala

2021

Energy Fuels

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Chemical looping combustion of solid biomass has the unique potential to generate energy with negative carbon emissions, while entailing an energy penalty compared to traditional combustion that is lower than that of the competing carbon capture technologies. In spite of these attractive features, research is still needed to bring the technology to a fully commercial level. The reason relies on a number of technological challenges mostly related to the oxygen carrier performance, its possible detrimental interaction with the biomass ash components, and the efficiency of the gas–solid contact with the biomass volatiles. This review is focused on these specific challenges which are particularly relevant when firing biomass rather than coal in a solid-based chemical looping combustion process. Special attention will be given to the most recent findings published on these aspects. Related performance evaluation by modeling, system integration, and techno-economic analysis will also be briefly reviewed.

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Section: Role Of Biomass Ash and The Fate Of Alkalimentioning

confidence: 99%

Section: Role Of Biomass Ash and The Fate Of Alkalimentioning

confidence: 99%

Section: ■ Oxygen Carriersmentioning

confidence: 99%

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Chemical Looping for Combustion of Solid Biomass: A Review

Coppola¹,

Scala

2021

Energy Fuels

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“…Many researchers have carried out extensive experiments on coal/biomass mixtures using different carrier particles. Different coal/biomass fractions may improve the plant's efficiency, and such arrangements may provide additional carbon credits [15,[26][27][28][29][30][31][32] by negative carbon emission. Hence, it has the potential to lower the total cost of carbon capture.…”

Section: Introductionmentioning

confidence: 99%

Intensification Insights from Chemical Looping Combustion Using Coal–Biomass Mixtures with Fe-Based Oxygen Carrier

Kevat

Banerjee

2022

Processes

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Chemical looping combustion (CLC) is a modern technology that enables the mitigation of the CO2 concentration without any expense of energy. Experimental evidence shows that combustion of coal/biomass in CLC technology leads to negative carbon emission by replacing the portion of coal with biomass. In the present work, CLC was simulated using a mixture of coal/biomass in CLC; using their different proportions resulted in enhanced CO and CO2 fractions in the fuel reactor. The carbon capture and oxide oxygen fraction were also found to increase with the enhancement of the fuel reactor’s temperature with different proportions of coal/biomass. Increases in the carbon capture efficiency and oxide oxygen fraction of up to 98.86% and ~98%, respectively, were observed within the experimental temperature range. The simulated results of various parameters were predicted and validated with the published experimental results. The stated parameters were also predicted as a function of the different rates of solid circulation and gasification agents. Higher coal char conversion was confirmed in the fuel reactor with the presence of higher biomass concentrations.

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“…All iron compounds involved have relatively high melting temperatures during both the oxidation and reduction stages . In addition, thermodynamic analysis and experimental studies have also indicated that when high-valence Fe 2 O 3 is reduced to low-valence Fe 3 O 4 , the fuel can be effectively converted to CO 2 and H 2 O. ,− …”

Section: Introductionmentioning

confidence: 99%

Assessment of the Redox Characteristics of Iron Ore by Introducing Biomass Ash in the Chemical Looping Combustion Process: Biomass Ash Type, Constituent, and Operating Parameters

Huo

Chu

et al. 2021

ACS Omega

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Chemical looping combustion (CLC) is a potential CO 2 capture and sequestration (CCS) technology that can easily separate CO 2 and H 2 O without energy loss and greatly improve the efficiency of carbon capture. Due to the inherent defects of natural iron ore, such as low reactivity and poor oxygen carrying capacity, four kinds of biomass ashes (rape stalk ash, rice stalk ash, platane wood ash, and U. lactuca ash) that have different constituents of K, Na, Ca, and Si were applied to modify the redox performance of natural iron ore. The effects of biomass ash type, constituent, reaction temperature, H 2 O vapor flow rate, and redox cycle on the CLC process were assessed experimentally in a batch fluidized bed reactor system. Oxygen carrier physicochemical characteristics were determined by several analytical techniques. The results showed that rape stalk ash, platane wood ash, and U. lactuca ash with a high K content and high K/Si ratio significantly improved the reactivity and cycle stability of iron ore, even after 10 redox cycles, while rice straw ash with a low K/Si ratio showed an inhibitory effect due to the formation of bridge eutectics, which enhanced agglomeration. In a range from 800 to 950 °C, higher temperatures led to a much better ability to promote the CLC process than lower temperatures. A higher flow rate of H 2 O had little effect on the further promotion of the CLC process due to hydrogen inhibition. It is believed that the application of BA-modified iron ore oxygen carriers is an effective strategy to improve the CLC process.

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Chemical looping based co-combustion of high ash Indian coal and rice straw operating under CO2 in-situ gasification mode

Cited by 17 publications

References 31 publications

Chemical Looping for Combustion of Solid Biomass: A Review

Chemical Looping for Combustion of Solid Biomass: A Review

Intensification Insights from Chemical Looping Combustion Using Coal–Biomass Mixtures with Fe-Based Oxygen Carrier

Assessment of the Redox Characteristics of Iron Ore by Introducing Biomass Ash in the Chemical Looping Combustion Process: Biomass Ash Type, Constituent, and Operating Parameters

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