Experimental Study on Oxy-Fuel Combustion and NO Emission in a Spouted-Fluidized Bed with under Bed Feeding

Xu, Ming-xin; Wu, Yu-Chin; Wu, Haibo; Ouyang, Haodong; Zheng, Sining; Lü, Qiang

doi:10.1007/s11630-021-1441-4

Cited by 13 publications

(4 citation statements)

References 37 publications

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“…Pressurized oxy-fuel combustion (POFC) is a promising CO2 capture technology because of its ability for highefficiency CO2 capture and storage (CSS) at a relatively low cost [1]. A major advantage of POFC is its ability to recover the latent heat of water vapor by subjecting the flue gas to a heat recovery process under pressurized conditions [2,3].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Oxy-fuel Combustion and Emission Characteristics using a 10 kWth Pressurized Fluidized Bed Combustor

Kim,

Lee,

Lee

et al. 2024

Preprint

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Pressurized oxy-fuel combustion (POFC) is a promising carbon capture and storage technology because of its ability for efficient CO2 capture and storage at a relatively low cost. However, the experimental studies conducted on this technology considering pressurized conditions are limited compared with those conducted considering atmospheric conditions. Thus, further investigation on the performance and environmental emissions of oxy-fuel combustion is necessary. In this study, oxy-fuel combustion experiments were conducted using a 10 kWth fluidized bed combustion (FBC) test rig at pressures ranging from 3 to 8 bar(g). The effects of combustion pressure, oxygen concentration, and cofiring with different fuels on combustion temperature, unburned carbon, combustion efficiency, as well as SOx and NOx emissions were examined. The experimental results showed that the CO2 concentration in the flue gas exceeds 90% in all POFC scenarios, thus facilitating the carbon capture process. Additionally, by increasing the combustion pressure, the unburned carbon and CO concentrations in the fly ash are reduced, thereby improving combustion efficiency. Furthermore, the variations in NO, NO2, N2O, and SO2 emissions were measured to assess their environmental impact. Moreover, cofiring tests using biomass under pressurized oxy-fuel conditions (5 bar(g), 30% O2:70% CO2) showed that POFC in a fluidized bed is environmentally friendlier and more efficient for energy production when burning a mixture of coal and biomass than other combustion methods.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of Oxy-fuel Combustion and Emission Characteristics using a 10 kWth Pressurized Fluidized Bed Combustor

Kim,

Lee,

Lee

et al. 2024

Preprint

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“…In addition, according to measuring soot in acetylene and natural gas flames, its concentration was found to increase with the increase of oxygen content. Many studies 25,26 have shown that O 2 /CO 2 combustion can reduce NO x emissions. Schluckner et al 27 .…”

Section: Introductionmentioning

confidence: 99%

“…[21][22][23][24] In addition, according to measuring soot in acetylene and natural gas flames, its concentration was found to increase with the increase of oxygen content. Many studies 25,26 have shown that O 2 /CO 2 combustion can reduce NOx emissions. Schluckner et al 27 carried out experimental and numerical simulation studies on two kinds of industrial non-premixed jet burners.…”

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confidence: 99%

Numerical investigation of blast furnace gas and coke oven gas combustion under different O₂/CO₂ environments

Zhang

et al. 2022

Greenhouse Gases

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A numerical model of a 75 t/h gas‐fired boiler burning blast furnace gas (BFG) and coke oven gas (COG) was developed to study the effect of O2/CO2 conditions on the combustion characteristics, verified by comparing with the results measured in field experiments. The results showed that the ignition distance of COG was shorter than that of BFG, and COG reached the stable combustion temperature of 1000 K earlier in the condition of O2/CO2 combustion with 31% O2 than in the condition of air combustion. Under different O2/CO2 conditions, the overall temperature of gas‐fired boiler decreased. The maximum temperature of air combustion, O2/CO2 combustion with 26% O2, and O2/CO2 combustion with 31% O2 were 1867, 1678, and 1834 K, respectively. Under the condition of O2/CO2 combustion, the radiation heat transfer of mixed gas was enhanced, and the overall heat flux was obviously improved. Under the O2/CO2 condition, the overall temperature was lower than that of air combustion, but the wall heat flux increased. The NOx production decreased after the change to O2/CO2 combustion, and the NOx generation at the furnace arch decreased from 70.28 mg/m3 to 6.94 mg/m3 under the condition of O2/CO2 combustion with 26% O2. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.

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“…Its main components were NO, N 2 O, and NO 2 , of which NO accounted for more than 90%. At present, many researchers have carried out some studies on the NO x emission characteristics during the combustion process of pulverized coal/char samples under pressurized oxy‐fuel combustion conditions 8–19 …”

Section: Introductionmentioning

confidence: 99%

Experimental study Char‐NO reduction characteristics at elevated pressure

Zhang

Wang

Chen

et al. 2021

Asia-Pacific J Chem Eng

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In order to decouple the reduction process of Char‐NO under pressurized conditions, a pressurized horizontal tube furnace experimental system was used to explore the NO reduction characteristics of pressurized pyrolysis char samples prepared under different conditions (0.3–1.2 MPa, 800–1000°C, 0.3–3.0 s). The research results showed that increasing pyrolysis pressure/temperature/residence time can inhibit the Char‐NO characteristics. When the environmental pressure increased, the reduction rate of NO gradually increased. As the reduction time increased, the total reduction of NO and the contents of C(N) structure on the surface of the residual char samples increased, some N‐5 structure with poor thermal stability would gradually undergo condensation polymerization to form N‐6 and N‐Q structures under the high temperature/high pressure conditions. Under the real pressurized conditions, the effect of reducing NO by char samples was the best at 0.6 MPa under real pressurized conditions in the pressure range of 0.3–1.2 MPa.

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Experimental Study on Oxy-Fuel Combustion and NO Emission in a Spouted-Fluidized Bed with under Bed Feeding

Cited by 13 publications

References 37 publications

Experimental Study of Oxy-fuel Combustion and Emission Characteristics using a 10 kWth Pressurized Fluidized Bed Combustor

Experimental Study of Oxy-fuel Combustion and Emission Characteristics using a 10 kWth Pressurized Fluidized Bed Combustor

Numerical investigation of blast furnace gas and coke oven gas combustion under different O₂/CO₂ environments

Experimental study Char‐NO reduction characteristics at elevated pressure

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Experimental Study on Oxy-Fuel Combustion and NO Emission in a Spouted-Fluidized Bed with under Bed Feeding

Cited by 13 publications

References 37 publications

Experimental Study of Oxy-fuel Combustion and Emission Characteristics using a 10 kWth Pressurized Fluidized Bed Combustor

Experimental Study of Oxy-fuel Combustion and Emission Characteristics using a 10 kWth Pressurized Fluidized Bed Combustor

Numerical investigation of blast furnace gas and coke oven gas combustion under different O2/CO2 environments

Experimental study Char‐NO reduction characteristics at elevated pressure

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Numerical investigation of blast furnace gas and coke oven gas combustion under different O₂/CO₂ environments