Gaseous emissions from advanced CLC and oxyfuel fluidized bed combustion of coal and biomass in a complex geometry facility:A comprehensive model

Krzywański, Jarosław; Czakiert, Tomasz; Nowak, W.; Shimizu, Tadaaki; Żyłka, Anna; Idziak, Kamil; Sosnowski, Marcin; Grabowska, Karolina

doi:10.1016/j.energy.2022.123896

Cited by 46 publications

(21 citation statements)

References 50 publications

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“…In the Fuel Reactor (FR), the oxygen carriers (OC) release oxygen, resulting in the combustion process. Then, the reduced metal oxides are transported to the air reactor (AR) for the oxidation processes [15]. A schematic diagram of the FB-CLC-SF system is shown in Figure 4.…”

Section: Experimental Procedures and Methodsmentioning

confidence: 99%

“…Ilmenite is a natural mineral and belongs to the group of iG-CLC oxygen carriers, while the CuO-based oxygen carriers belong to the CLOU functional group. A detailed description of all the oxygen carriers used in this work can be found in [12,15]. The flue gas components were measured at the outlet of the fuel reactor of the FB-CLC-SF facility using gas analysers based on infrared detection (GASMET DX-4000).…”

Section: Experimental Procedures and Methodsmentioning

confidence: 99%

“…The composition of solid fuels includes sulphur and nitrogen, which are the sources of NO x (i.e., NO + NO 2 ) and SO 2 emissions from combustion, i.e., the major gaseous pollutants, and their emissions should be considered when a combustion technology is implemented. Many factors influence NO x and SO 2 formation, including the fuel properties, combustion conditions, and construction of the combustor [15]. The CLC technology produces NO x from the fuel, which means that this technology does not produce thermal nitrogen oxides from the air, as in conventional combustion.…”

Section: Figurementioning

confidence: 99%

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Modelling of SO2 and NOx Emissions from Coal and Biomass Combustion in Air-Firing, Oxyfuel, iG-CLC, and CLOU Conditions by Fuzzy Logic Approach

et al. 2022

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Chemical looping combustion (CLC) is one of the most advanced technologies allowing for the reduction in CO2 emissions during the combustion of solid fuels. The modified method combines chemical looping with oxygen uncoupling (CLOU) and in situ gasification chemical looping combustion (iG-CLC). As a result, an innovative hybrid chemical looping combustion came into existence, making the above two technologies complementary. Since the complexity of the CLC is still not sufficiently recognized, the study of this process is of a practical significance. The paper describes the experiences in the modelling of complex geometry CLC equipment. The experimental facility consists of two reactors: an air reactor and a fuel reactor. The paper introduces the fuzzy logic (FL) method as an artificial intelligence (AI) approach for the prediction of SO2 and NOx (i.e., NO + NO2) emissions from coal and biomass combustion carried out in air-firing; oxyfuel; iG-CLC; and CLOU conditions. The developed model has been successfully validated on a 5 kWth research unit called the dual fluidized bed chemical looping combustion of solid fuels (DFB-CLC-SF).

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Section: Experimental Procedures and Methodsmentioning

confidence: 99%

Section: Experimental Procedures and Methodsmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Modelling of SO2 and NOx Emissions from Coal and Biomass Combustion in Air-Firing, Oxyfuel, iG-CLC, and CLOU Conditions by Fuzzy Logic Approach

et al. 2022

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“…This is mainly because the FR flue gas is nitrogen-free and, therefore, all gaseous species have much higher concentrations than in other techniques due to the reduction of the overall flue gas volume. Krzywanski et al [18] have developed a modeling approach to predict NOx and SOx emissions from coal and biomass in different CLC combustion modes, including iG-CLC. The modeling results were validated against experimental results from a 5 kWth research unit.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of an Industrial-Scale 525 MWth Petcoke Chemical Looping Combustion Power Plant

et al. 2023

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This paper presents the modeling and simulation of an industrial-scale chemical looping combustion (CLC) power plant, including all process units (reactors, flue gas treatment units, heat integration, steam cycle, and CO2 compression train). A model of a 525 MWth CLC power plant was built using a rigorous representation of the solid fuel and oxygen carrier. Petcoke was considered the main fuel of interest in this study, and it is compared with other solid fuels. The flue gas compositions obtained with the model show that cleanup units are mandatory to comply with CO2 quality requirements. High levels of flue gas treatment, including 97.1% deNOx and 99.4% deSOx, are needed to achieve typical specifications for captured CO2. This is mainly due to the high level of contaminants in the fuel, but also to the absence of nitrogen in the CLC flue gas, thus resulting in higher concentrations for all substances. The high level of flue gas treatment is thus one of the important challenges for solid fuel combustion in CLC. The overall CO2 capture efficiency of the plant is estimated to be as high as 94%. Regarding the energy balance, a process net efficiency of 38% is obtained. Comparing the results with other available technologies shows that CLC exhibits one of the highest net plant efficiencies and carbon capture rates. CLC is thus a promising technology to produce clean energy from solid fuels. Finally, based on a sensitivity analysis, it is shown that process efficiency is mainly affected by the design and performance of the CLC furnace, the steam injection rate in the fuel reactor, the char separation efficiency, and the excess oxygen in the air reactor.

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“…As a renewable energy source and resource, biomass has great potential to be exploited in chemical looping combustion (CLC) [1][2][3][4][5][6][7], green metallurgy [8][9][10][11][12][13], and synthesis of biochar-supported metal catalysts [14][15][16][17][18]. These biomass utilization technologies involve a common reaction that is the reduction of metal oxides by biochar.…”

Section: Introductionmentioning

confidence: 99%

Temperature-Programmed Reduction of NiO/Al2O3 by Biochar In Situ Generated from Citric Acid

Cheng

2022

Processes

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The reduction of metal oxides by biochar is an important reaction for many biomass utilization technologies. This work investigated the temperature–programmed reduction (TPR) of NiO/Al2O3 by in situ generated biochar from citric acid pyrolysis. Firstly, NiO/Al2O3 was loaded with citric acid by impregnation and then heated from ambient temperature to 900 °C in a N2 flow. The process was on–line analyzed by the TGA–FTIR technique. Secondly, a series of intermediates was obtained and characterized by XRD, CHNO elemental analysis, and temperature programmed oxidation (TPO). Lastly, a control experiment of unsupported NiO was conducted to show the influence of Al2O3 support on the NiO reduction. Results showed that the whole heating process could be resolved into two parts that is citric acid pyrolysis and NiO reduction at a heating rate of 5 °C/min. The NiO reduction occurred above 400 °C with the biochar from citric acid pyrolysis as reductant. In the temperature–programmed reduction process, the Al2O3–supported NiO exhibited three reduction phases in contrast with only one reduction phase for the unsupported NiO. A hypothesis was proposed to explain this. The presence of Al2O3 support may result in different deposition sites of biochar (on NiO or on Al2O3), and consequently different reduction mechanisms.

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Gaseous emissions from advanced CLC and oxyfuel fluidized bed combustion of coal and biomass in a complex geometry facility:A comprehensive model

Cited by 46 publications

References 50 publications

Modelling of SO2 and NOx Emissions from Coal and Biomass Combustion in Air-Firing, Oxyfuel, iG-CLC, and CLOU Conditions by Fuzzy Logic Approach

Modelling of SO2 and NOx Emissions from Coal and Biomass Combustion in Air-Firing, Oxyfuel, iG-CLC, and CLOU Conditions by Fuzzy Logic Approach

Modeling and Simulation of an Industrial-Scale 525 MWth Petcoke Chemical Looping Combustion Power Plant

Temperature-Programmed Reduction of NiO/Al2O3 by Biochar In Situ Generated from Citric Acid

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