Effect of rank, temperatures and inherent minerals on nitrogen emissions during coal pyrolysis in a fixed bed reactor

Yan, Xiao Bo; Che, Defu; Xu, Tongmo

doi:10.1016/j.fuproc.2004.08.005

Cited by 40 publications

(26 citation statements)

References 47 publications

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“…HCN and NO yields were lower than NH 3 yields. Previous results and data suggested that NH 3 is the dominant nitrogen oxide precursor in the volatile during coal pyrolysis at low heating rates 25. Figures 4–6 illustrate formation of NH 3 , HCN, and NO as a function of temperature during pyrolysis of DT, FS, and NM coals, respectively.…”

Section: Resultsmentioning

confidence: 89%

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Relationship between nitrogenous species in coals and volatile nitrogen‐containing yields during pyrolysis

Wang

Zhang

Zhao

et al. 2010

Asia-Pacific J Chem Eng

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Nitrogen in coal is a major pollutant that inhibits the effective and extensive utilization of coal, and hence, nitrogen removal during and after coal combustion is of great importance. Future utilization of coal requires accurate knowledge of its structure and properties. Datong coal (DT, bituminous coal), Huolinhe coal (NM, brown coal) and Fushun coal (FS, brown coal) were pyrolyzed in a fixed-bed reactor under argon atmosphere with a heating rate of 15• C/min. X-ray photoelectron spectroscopy (XPS) was used to investigate the presence of nitrogen in the coals and their chars obtained from pyrolysis. The nitrogenous components in the product gases were analyzed by Fourier transform infrared (FT-IR) spectrometer. The results indicate that N-5 is the main nitrogen-bearing compound in DT coal and NM coal, whereas in FS coal N-6 is the main nitrogen-bearing compound. After pyrolysis at 600• C, the quantity of N-6 in the char rises for DT coal, and drops for NM coal and FS coal. After pyrolysis at 1000• C, the quantity of N-6 decreases significantly for FS coal, and considerable quantity of N-Q is detected. NH 3 , HCN, and NO were identified among the gases resulting from pyrolysis, with the HCN and NO yields being lower than the NH 3 yields. In coal pyrolysis, the initial formation temperature of NH 3 is approximately the same as that of HCN. The temperatures are almost identical when the concentrations of NH 3 and HCN reach their maxima for DT coal and FS coal. The formation of HCN starts at a temperature of about 400• C, and below 700• C, considerable amounts of HCN and NH 3 are produced. The amount of nitrogen released increases with the temperature at which pyrolysis takes place, the maximum release rate being 81.28% at 1000• C. 

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Section: Resultsmentioning

confidence: 89%

“…NH 3 formation has been found to occur at nearly the same temperature as HCN during coal pyrolysis. Yan et al found that the trends in HCN and NH 3 emissions are very similar when 11 coals were pyrolyzed in a fixed‐bed quartz reactor 25. This observation suggests that the formation of HCN and NH 3 was controlled probably by the same process.…”

Section: Resultsmentioning

confidence: 98%

Relationship between nitrogenous species in coals and volatile nitrogen‐containing yields during pyrolysis

Wang

Zhang

Zhao

et al. 2010

Asia-Pacific J Chem Eng

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“…In order to better understand the reactions taking place during coal pyrolysis, an experimental setup was built to investigate nitrogen conversion [12] . Fig.…”

Section: Fuel Nitrogen Conversion During Coal Pyrolysismentioning

confidence: 99%

“…In order to elucidate fuel nitrogen evolution mechanism during coal combustion, NO x releases from different coals under different conditions have been reported by authors et al Model compounds pyrolysis and oxidation [3,4] , effect of the cooling and reheating on NO x release [5] , NO x reduction by volatile and char [6,7] , NO x release during coal combustion and catalytic effects of minerals on NO x emission from coal combustion [8][9][10][11] , nitrogen release during pyrolysis [12] , secondary pyrolysis of volatile nitrogen [13] ,the interaction of char and volatile on NO x release during combustion are carefully examined and reported previously [14,15] .…”

Section: Introductionmentioning

confidence: 99%

Fuel Nitrogen Evolution during Coal Pyrolysis and Gasification

Che

Liu

Lin

et al. 2010

AIP Conference Proceedings

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“…The effects of cationic components are mainly reflected in the following aspects: activities in cracking oxygen-containing functional groups into CO and CO 2 molecules [17,18], promoting release of aliphatic materials [19], and hindering release of larger aromatic molecules [20]. In addition, inherent minerals have significant effect on emission of sulfur and nitrogen during coal pyrolysis [21,22].…”

Section: Introductionmentioning

confidence: 99%

Effects of mineral matter and temperatures on conversion of carboxylic acids and their derivatives during pyrolysis of brown coals

Kou

Bai

et al. 2016

Fuel Processing Technology

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Effect of rank, temperatures and inherent minerals on nitrogen emissions during coal pyrolysis in a fixed bed reactor

Cited by 40 publications

References 47 publications

Relationship between nitrogenous species in coals and volatile nitrogen‐containing yields during pyrolysis

Relationship between nitrogenous species in coals and volatile nitrogen‐containing yields during pyrolysis

Fuel Nitrogen Evolution during Coal Pyrolysis and Gasification

Effects of mineral matter and temperatures on conversion of carboxylic acids and their derivatives during pyrolysis of brown coals

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