Oxy-combustion characteristics as a function of oxygen concentration and biomass co-firing ratio in a 0.1 MWth circulating fluidized bed combustion test-rig

Nguyen, Hoang Khoi; Moon, Jong-Ho; Jo, Sung-Ho; Park, Sung Jin; Seo, Myung Won; Won, Ho; Yoon, Sang Jun; Yoon, Sung-Min; Song, Bang-Ho; Lee, Uendo; Yang, Chang Won; Mun, Tae‐Young; Lee, Jae-Goo

doi:10.1016/j.energy.2020.117020

Cited by 20 publications

(16 citation statements)

References 36 publications

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“…Besides, the lower CO 2 concentration in the oxy-fuel atmosphere promoted the increase of the co-combustion temperature, which leads to an increase in SO 2 emission. 24 Figure 10 shows the sulfur mass balance of different combustion atmospheres, and the results show that as combustion atmosphere changes from air to Oxy-40, the sulfur content in the fuel ash becomes lowest in the air atmosphere and highest in the Oxy-21 atmosphere, contrary to SO 2 emission. The content of sulfur in other forms is highest in the air atmosphere and lowest in the Oxy-21 atmosphere, which may be due to more SO 2 generated during the cocombustion absorbed by moisture and more fuel sulfur converted into gaseous SO 3 in the air atmosphere.…”

Section: Methodsmentioning

confidence: 99%

“…Although this strategy is of great significance to the development of renewable energy, it is currently lacking mechanism for experimental research. SO 2 emission is an important issue for co-combustion of coal and biomass, the high alkali metal content in biomass may affect SO 2 emission and sulfur self-retention, 24 and the formation of alkali sulfates increases the possibility of fouling. 25 Besides, the generated SO 2 during the co-combustion process will induce boiler corrosion and cause pollution to the environment.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of SO₂ Emission and Sulfur Conversion Characteristics of Pressurized Oxy-Fuel Co-combustion of Coal and Biomass

et al. 2020

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Pressurized oxy-fuel combustion is a solution to achieve low-cost CO 2 capture and higher operating efficiency. The combination of pressurized oxy-fuel combustion technology and biomass combustion technology can achieve negative CO 2 emissions. However, pressurized oxy-fuel co-combustion of coal and biomass lacks mechanism understanding and the studies on pollutant emissions are scarce. To investigate SO 2 emission concentration, the conversion rate of fuel sulfur to SO 2 , sulfur mass balance, and sulfur content and forms in the fuel ash of pressurized oxy-fuel co-combustion of coal and biomass, a series of cocombustion experiments were carried out in a horizontal tube furnace. The experimental fuels were lignite and corn straw, and the experimental parameters were biomass blending ratio (M b = 0, 30, 50, 70, and 100%), combustion atmosphere (air, Oxy-21, Oxy-30, and Oxy-40), reaction pressure (0.1, 0.3, 0.5, and 0.7 MPa), and combustion temperature (800, 850, and 900 °C). The experimental results showed that SO 2 actual emissions decreased as M b increased while the conversion rate of fuel sulfur to SO 2 was lowest at 50% M b . Ash analysis indicated that more sulfur converted to CaSO 4 at 50% M b . SO 2 actual emissions was highest in the air atmosphere and lowest in the Oxy-21 atmosphere. Higher reaction pressure suppressed SO 2 actual emissions and promoted the sulfur converted to other forms of sulfide, and reaction pressure had no obvious effect on CaSO 4 and K 2 SO 4 in the fuel ash. Higher combustion temperature slightly promoted SO 2 actual emissions and conversion rate of fuel sulfur to SO 2 . Except for 100% M b , the three slagging indexes for all combustion experiments were in the criteria of low slagging trend. According to T-A, slagging caused by alkali metals may occur during 100% M b combustion.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study of SO₂ Emission and Sulfur Conversion Characteristics of Pressurized Oxy-Fuel Co-combustion of Coal and Biomass

et al. 2020

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“…Nguyen and co-workers [20] studied SO 2 , NO and CO emissions during co-combustion of lignite and wood pellets (50-100%wt. share in the fuel) in an oxy-fuel 100 kW th test facility.…”

Section: Literature Reviewmentioning

confidence: 99%

Pollutant Emissions during Oxy-Fuel Combustion of Biomass in a Bench Scale CFB Combustor

2022

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Nowadays oxy-fuel combustion of coal and biomass is the most promising option for the reduction of CO2 emissions from power plants. In this paper, emissions of NOx (NO, NO2, N2O and their precursors, such as NH3 and HCN), SO2 and CO during conventional and oxy-fuel combustion of three kinds of biomass (agro, woody and energy crop) and a reference coal are presented and discussed. Combustion tests were conducted at 850 °C in the laboratory-scale circulating fluidized bed (CFB) reactor in air and O2/CO2 atmospheres. A FTIR spectrometer was used to measure instantaneous concentrations of all pollutants in the flue gas. Emissions of SO2, N2O and CO for the combustion of biomass in all atmospheres were lower than those for the combustion of reference coal. It was found that oxidation of nitrogen species released with volatile matter was responsible for high emissions of NOx during combustion of biomass fuels in air and mixtures of O2 and CO2. The lowest NO emissions for tested fuels were detected in oxy-21 atmosphere (21% O2/70% CO2). Oxy-combustion of biomass in O2/CO2 mixtures at 30% and 40% O2 caused a decrease in emissions of N2O and CO while NO and SO2 emissions increased. The results of this study show that the tested biomass fuels are ideal renewable energy resources both in conventional and oxy-fuel conditions with a minor potential for environmental pollution.

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“…Simultaneous solution of the Equations (4), (7), and (8) for any given Φ and OF can be used in evaluating the required set points of C 3 H 8 , O 2 , and CO 2 mass flow rate controllers. Using the equations, a text matrix was developed to examine the flames with a wide range of Φ (range: 0.1-1.0) and OF (range: 15%-70%).…”

Section: Setup Of the Premixed Swirl Combustormentioning

confidence: 99%

“…The higher flame temperature, superior emission control, in addition to minimum hardware changes make oxy-fuel combustion a perfect alternative for air-fuel combustion. 6,7 Moreover, the stringent emissions regulations and the depleting fossil-fuel reserves both motivate the transition from the conventional air-combustion to the novel oxy-combustion technology. However, shifting toward oxy-combustion requires firm understanding of the combustion behavior with different fuel/oxidizer compositions.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis supported with experimental measurements of premixed oxy‐propane flames in a fuel‐flex gas turbine combustor

et al. 2021

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The combustion, exhaust-gas concentrations, and stability characteristics of premixed CO 2 -diluted oxy-propane (C 3 H 8 /O 2 /CO 2 ) flames were investigated computationally using large eddy simulations (LES) in a swirl-stabilized model gas-turbine combustor. The simulations were carried out for ranges of equivalence ratio (Φ: 0.26-0.80) and oxygen fraction (OF: 35%-60%) at a fixed bulk inlet velocity of 5.2 m/s. The results indicate that the reaction rates increase with the increase of Φ and OF. Flames of the same adiabatic flame temperature (T ad ) show similar macro-and flowfield-structures, in terms of flame shape, flow circulation, and temperature, and species distributions, irrespective of the values of Φ and OF. At higher T ad , the flames were observed to be more compact with reduced flame thickness and higher Damkohler number (Da). In all cases, Da > 1 were observed, indicating the dominance of reaction rate in oxy-propane flames than the diffusion rate. A secondary IRZ was also observed near the outlet of the combustor. Mixture composition and combustion temperature influence the CO concentration at the combustor exit. The highest CO emission was observed at 0.17 ppm for the flame with highest Φ and T ad , meanwhile no CO emission was seen for flames with high OF and low Φ among the studied cases. Highlights 1. Adiabatic flame temperature is a quantifying parameter for flame

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Oxy-combustion characteristics as a function of oxygen concentration and biomass co-firing ratio in a 0.1 MWth circulating fluidized bed combustion test-rig

Cited by 20 publications

References 36 publications

Experimental Study of SO₂ Emission and Sulfur Conversion Characteristics of Pressurized Oxy-Fuel Co-combustion of Coal and Biomass

Experimental Study of SO₂ Emission and Sulfur Conversion Characteristics of Pressurized Oxy-Fuel Co-combustion of Coal and Biomass

Pollutant Emissions during Oxy-Fuel Combustion of Biomass in a Bench Scale CFB Combustor

Numerical analysis supported with experimental measurements of premixed oxy‐propane flames in a fuel‐flex gas turbine combustor

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Oxy-combustion characteristics as a function of oxygen concentration and biomass co-firing ratio in a 0.1 MWth circulating fluidized bed combustion test-rig

Cited by 20 publications

References 36 publications

Experimental Study of SO2 Emission and Sulfur Conversion Characteristics of Pressurized Oxy-Fuel Co-combustion of Coal and Biomass

Experimental Study of SO2 Emission and Sulfur Conversion Characteristics of Pressurized Oxy-Fuel Co-combustion of Coal and Biomass

Pollutant Emissions during Oxy-Fuel Combustion of Biomass in a Bench Scale CFB Combustor

Numerical analysis supported with experimental measurements of premixed oxy‐propane flames in a fuel‐flex gas turbine combustor

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Experimental Study of SO₂ Emission and Sulfur Conversion Characteristics of Pressurized Oxy-Fuel Co-combustion of Coal and Biomass

Experimental Study of SO₂ Emission and Sulfur Conversion Characteristics of Pressurized Oxy-Fuel Co-combustion of Coal and Biomass