The role of H2O in NO formation and reduction during oxy-steam combustion of bituminous coal char

Yue, Shuang; Wang, Chunbo; Xu, Ziyang; Wang, Dong; Zheng, Fei; Anthony, Edward J.

doi:10.1016/j.combustflame.2021.111883

Cited by 23 publications

(3 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Each coal sample utilized weighed approximately 0.08 g with a precision of ±0.0001 g. The total gas flow rate was 2.67 L/min. Our prior research demonstrated that the gas flow rate of 2.67 L/min can mitigate the impact of external diffusion on experimental outcomes. − At least three experiments per group were conducted to reduce experimental errors. Table shows the detailed experimental conditions.…”

Section: Methodsmentioning

confidence: 99%

The Influence of NH₃ on Coal Combustion Kinetics during Coal/NH₃ Cocombustion: Experiments and ReaxFF MD Simulations

Hong,

Yuan,

Wang

2024

Energy Fuels

Self Cite

View full text Add to dashboard Cite

To reduce CO 2 emissions from coal-fired plants, coal/NH 3 cocombustion has received widespread attention. In this work, the influence of NH 3 on coal combustion kinetics during coal/NH 3 cocombustion was studied by constant temperature thermogravimetric experiment and reactive molecular dynamics (ReaxFF MD). The experimental results show that coal combustion is inhibited during coal/NH 3 cocombustion. The weight loss of coal during coal/NH 3 cocombustion was always slower than that during pure coal combustion at all temperatures, and the burn out time of coal increases by 20−30s. The higher the NH 3 cofiring ratio, the slower the weight loss rate of coal. When the NH 3 cofiring ratio increases from 0 to 60%, the burnout time of coal increases by about 25%. The higher the carbon content in coal, the more obvious is the inhibition effect of NH 3 on coal combustion. The inhibitory mechanism of NH 3 on coal was then studied by ReaxFF MD. It is found that the combustion of coal during coal/NH 3 cocombustion is inhibited mainly because NH 3 will compete with coal for O 2 . Compared to pure coal combustion and pure NH 3 combustion, the transfer of O to nitrogen oxides increases by about 1.5 times while the transfer of O to carbon oxides decreases by about 10% during coal/NH 3 cocombustion. This proves that NH 3 dominates in competition for O 2 . Compared with pure coal combustion, the combustion of char, tar, and carbonaceous gas from coal during coal/NH 3 cocombustion is restrained. The decrease rate of H/C ratio of char will slow down. The attachment of O molecules on char will also decrease. These further confirm that NH 3 inhibits coal combustion by competing with coal for O 2 . In this work, the competition mechanism during coal/ NH 3 cocombustion is studied, which is helpful for the development of stable coal combustion and unburned carbon emission reduction technology.

show abstract

Section: Methodsmentioning

confidence: 99%

The Influence of NH₃ on Coal Combustion Kinetics during Coal/NH₃ Cocombustion: Experiments and ReaxFF MD Simulations

Hong,

Yuan,

Wang

2024

Energy Fuels

Self Cite

View full text Add to dashboard Cite

show abstract

“…Additionally, the isothermal thermogravimetric system was used to perform separate pyrolysis and co-pyrolysis experiments. The comprehensive construction of the isothermal thermogravimetric system has been published in a previous work . After heating the reactor to the set temperature, a controlled flow of high-purity N 2 was introduced at a rate of 2.67 L/min for 30 min.…”

Section: Methodsmentioning

confidence: 99%

“…The comprehensive construction of the isothermal thermogravimetric system has been published in a previous work. 32 After heating the reactor to the set temperature, a controlled flow of high-purity N 2 was introduced at a rate of 2.67 L/min for 30 min. Subsequently, 0.08 g of the sample was uniformly distributed onto a corundum boat, and immediately transferred to the isothermal zone of the reactor.…”

Section: Experimental Systemmentioning

confidence: 99%

Investigation of N Migration during Municipal Sludge/Coal Co-Pyrolysis via ReaxFF Molecular Dynamics

Xu,

Hong,

Wang

et al. 2023

Energy Fuels

Self Cite

View full text Add to dashboard Cite

Oxy-Fuel Combustion in FBRs

Duan,

2024

Fluidized Bed Reactors for Carbon Capture

View full text Add to dashboard Cite

show abstract

The role of H2O in NO formation and reduction during oxy-steam combustion of bituminous coal char

Cited by 23 publications

References 51 publications

The Influence of NH₃ on Coal Combustion Kinetics during Coal/NH₃ Cocombustion: Experiments and ReaxFF MD Simulations

The Influence of NH₃ on Coal Combustion Kinetics during Coal/NH₃ Cocombustion: Experiments and ReaxFF MD Simulations

Investigation of N Migration during Municipal Sludge/Coal Co-Pyrolysis via ReaxFF Molecular Dynamics

Oxy-Fuel Combustion in FBRs

Contact Info

Product

Resources

About

The role of H2O in NO formation and reduction during oxy-steam combustion of bituminous coal char

Cited by 23 publications

References 51 publications

The Influence of NH3 on Coal Combustion Kinetics during Coal/NH3 Cocombustion: Experiments and ReaxFF MD Simulations

The Influence of NH3 on Coal Combustion Kinetics during Coal/NH3 Cocombustion: Experiments and ReaxFF MD Simulations

Investigation of N Migration during Municipal Sludge/Coal Co-Pyrolysis via ReaxFF Molecular Dynamics

Oxy-Fuel Combustion in FBRs

Contact Info

Product

Resources

About

The Influence of NH₃ on Coal Combustion Kinetics during Coal/NH₃ Cocombustion: Experiments and ReaxFF MD Simulations

The Influence of NH₃ on Coal Combustion Kinetics during Coal/NH₃ Cocombustion: Experiments and ReaxFF MD Simulations