Simulation of nitrogen transformation in pressurized oxy-fuel combustion of pulverized coal

Liang, Xiubo; Wang, Qinhui; Luo, Zhongyang; Zhang, Heng; Li, Kaikun; Feng, Yuanyue; Shaikh, Abdul Rahim; Cen, Jianmeng

doi:10.1039/c8ra07594h

Cited by 16 publications

(4 citation statements)

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“…3 By investigating different experimental conditions, the establishment of a coal pyrolysis kinetics model will be helpful to predict the composition distribution of pyrolysis products more accurately. 4,5 Generally, kinetics models of coal pyrolysis involve global and network models. 6 Early research on coal pyrolysis models mainly started from simplied mechanisms and proposed global models based on one-step reaction, two-step competitive reactions, or multi-stage nite parallel reactions.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis of a typical low-rank coal: application and modification of the chemical percolation devolatilization model

Yan

et al. 2021

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Pyrolysis of a typical low-rank coal: application and modification of the chemical percolation devolatilization model

Yan

et al. 2021

RSC Adv.

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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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“…found that an increase of the combustion pressure from atmospheric to 1.1 MPa resulted in an increase of the net efficiency from 27.2 to 30.5% in a POFC system. Besides, there are a few simulation studies on POFC. , Liang et al built chemical kinetic modeling to simulate nitrogen transformation during the pressurized oxy-fuel combustion process of pulverized coal. Gu et al used a computational fluid dynamics model based on the multiphase particle-in-cell method to predict the oxy-coal combustion process in the pressurized fluidized bed.…”

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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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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Simulation of nitrogen transformation in pressurized oxy-fuel combustion of pulverized coal

Abstract: Chemical kinetic modeling was applied to simulate N transformation in pressurized oxy-fuel combustion and key reaction paths were revealed.

Cited by 16 publications

References 50 publications

Pyrolysis of a typical low-rank coal: application and modification of the chemical percolation devolatilization model

Pyrolysis of a typical low-rank coal: application and modification of the chemical percolation devolatilization model

Experimental study Char‐NO reduction characteristics at elevated pressure

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

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Simulation of nitrogen transformation in pressurized oxy-fuel combustion of pulverized coal

Abstract: Chemical kinetic modeling was applied to simulate N transformation in pressurized oxy-fuel combustion and key reaction paths were revealed.

Cited by 16 publications

References 50 publications

Pyrolysis of a typical low-rank coal: application and modification of the chemical percolation devolatilization model

Pyrolysis of a typical low-rank coal: application and modification of the chemical percolation devolatilization model

Experimental study Char‐NO reduction characteristics at elevated pressure

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

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Product

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