Experimental and numerical investigation on sulfur transformation in pressurized oxy-fuel combustion of pulverized coal

Liang, Xiubo; Wang, Qinhui; Luo, Zhongyang; Eddings, Eric G.; Ring, Terry A.; Li, Simin; Lin, Jianzhong; Xue, Shuang; Han, Long; Xie, Guo-Jun

doi:10.1016/j.apenergy.2019.113542

Cited by 44 publications

(12 citation statements)

References 52 publications

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“…Previous studies indicated that the CO 2 partial pressure in the oxy-fuel atmosphere increased with reaction pressure that promoted the formation of CO, 42,43 which enhanced the conversion rate of SO 2 to COS and S 44 following reactions 5−7. However, the CO emission concentration in the fuel gas of pressurized oxy-fuel co-combustion of coal and biomass decreased with increasing reaction pressure.…”

Section: Methodsmentioning

confidence: 98%

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: 98%

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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“…In a reductive atmosphere of aerobic combustion, organic sulfur is converted to H 2 S and COS. The elemental sulfur [28] in the coal enters the sulfide flame in the form of sulfur vapor when heated:…”

Section: Mechanism Of Sulfur Evolution During Coal Combustionmentioning

confidence: 99%

Sulfur Conversion of Mixed Coal and Gangue during Combustion in a CFB Boiler

Zhao

Zeng

et al. 2020

Energies

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The construction of a power plant using a 660 MWe supercritical circulating fluidized bed (CFB) boiler with co-combustion of coal and gangue has been proposed in China. Therefore, this study simulated the distribution law and transformation mechanism of sulfur-containing phases using three low-calorific samples of gangue and coal mixtures under different conditions, based on the thermodynamic simulation software HSC Chemistry. The results showed that sulfur low in calorific value coal is mainly converted into gas phase SO2, solid phase alkali metal sulfate (Na2SO4 and K2SO4), and alkaline earth metal sulfate (CaSO4 and MgSO4) in an oxidizing atmosphere. Under a reductive atmosphere, sulfur in coal is mainly converted into gaseous H2S, COS (Carbon oxysulfide), and solid FeSx. With an increase in the O/C ratio, the distribution curve of sulfur-containing substances contracted to lower temperatures. It was established that the sulfur fixation capacity of coal ash depends on the relative amounts of basic oxides and sulfur present in it. Relevant conclusions were also verified and compared to those of the laboratory small-fluidized bed test bench and the 3 MWth CFB combustion test bench.

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“…Any leaks in the boiler and additional air intakes have a detrimental effect on the efficiency of the oxy-combustion process as they increase the content of nitrogen in the combustion atmosphere from one to two sources: nitrogen contained in O 2 flows with reduced purity and nitrogen from such leaks in the combustion system. This additional source of nitrogen in the oxy combustion process can be eliminated by using the combustion process at the pressure level exceeding the atmospheric one (Lupiáñez et al 2013;Zebian and Mitsos 2014;Liang et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Emission of typical pollutants (NOX, SO2) in the oxygen combustion process with air in-leakages

Moroń

Ferens

Wach

2021

Environ Sci Pollut Res

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Oxygen combustion, being an alternative to air combustion, is distinguished in a variety of modern coal management technologies by quick and easy removal of CO2 from the combustion process, which is the key merit of this oxy-fuel technology. The laboratory work conducted so far has not directly addressed the issue of air in-leakages in the oxy-fuel system. The previous studies showed that air in-leakages in the combustion system (both under the air and oxygen regime) occur and affect the combustion process. However, there are no direct research studies on the volume of air in-leakages and their impact on the individual stages of combustion, including the emission of gaseous pollutants. This article focuses on the assessment of the impact of air in-leakages on NOx and SO2 emissions for a single-stage coal-dust combustion system. Moreover, these studies were supplemented with measurements on the rate of devolatilisation of volatile matters and, in particular, on the rate of nitrogen compounds released from fuel. The obtained results of combustion in the oxy-fuel atmosphere with the following air in-leakage levels: 10, 15 and 20% were compared to combustion conditions in the air. Air in-leakages in the oxygen combustion system create an additional flow of oxygen and nitrogen appearing in the combustion area, which affects the course of pollutants and their emission. The conducted studies have shown that when adequate tightness of the combustion system is provided, it contributes to the reduced emission of nitrogen compounds.

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Experimental and numerical investigation on sulfur transformation in pressurized oxy-fuel combustion of pulverized coal

Cited by 44 publications

References 52 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

Sulfur Conversion of Mixed Coal and Gangue during Combustion in a CFB Boiler

Emission of typical pollutants (NOX, SO2) in the oxygen combustion process with air in-leakages

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Experimental and numerical investigation on sulfur transformation in pressurized oxy-fuel combustion of pulverized coal

Cited by 44 publications

References 52 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

Sulfur Conversion of Mixed Coal and Gangue during Combustion in a CFB Boiler

Emission of typical pollutants (NOX, SO2) in the oxygen combustion process with air in-leakages

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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