Characteristics of polycyclic aromatic hydrocarbon release during spontaneous combustion of coal and gangue in the same coal seam

Wang, Haiyan; Cheng, Chaofeng; Cheng, Chuntian

doi:10.1016/j.jlp.2018.07.004

Cited by 36 publications

(16 citation statements)

References 10 publications

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“…In combination with Figure 13, as the calcium/sulfur ratio increased, the combination of S, Fe, and Ca formed CaS through the endothermic reaction: (27) The temperature rise also promotes this reaction. Therefore, at an equal calcium/sulfur ratio, the equilibrium content of CaS increases as the temperature increases.…”

Section: Effect Of O/cmentioning

confidence: 73%

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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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Section: Effect Of O/cmentioning

confidence: 73%

“…FeS 2 + CO = FeS + COS (8) Organic sulfur [27] components in coal combustion are more complex with their main forms of thiol R-SH, thioether R-S-R, thiophene-containing aromatic system, thioxanthone, and disulfide RSSR. In an oxidizing atmosphere, they are all oxidized to SO 2 :…”

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 higher the degree of coal metamorphism, the higher the volatile content of coal, the easier the coal spontaneous combustion 2 . The higher the moisture content in coal, the higher the degree of coal looseness, and the higher the oxidation rate 13 . When sulfur in coal is oxidized at low temperature, the expansion of coal is loose, the oxidation area of coal is increased, and its decomposition products enhance the oxygen absorption of coal 14 .…”

Section: Theoretical Analysis Of Causes Of Fire In Minementioning

confidence: 99%

Risk identification of coal spontaneous combustion based on COWA modified G1 combination weighting cloud model

Jia

Wang³

et al. 2022

Sci Rep

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To realize the scientific judgment of spontaneous combustion risk in the coal mine, the spontaneous combustion influence factors were analyzed from the three aspects of coal spontaneous combustion tendency, air leakage, and oxygen supply, heat storage and heat dissipation. And the basis for the evaluation of t spontaneous combustion grade was constructed. Combination ordered weighted averaging (COWA) calculation was introduced to optimizes G1 subjective weighting, and a COWA modified G1 combined weighting cloud model was proposed to identify the spontaneous combustion risk in the coal mine. Finally, the rationality of the model was verified with actual cases. The research results show that the spontaneous combustion risk level in the Lingquan coal mine is relatively safe, which is consistent with the actual situation. And the spontaneous combustion tendency of coal is the leading factor affecting spontaneous combustion risk.

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“…Some numerous studies ( Zhou et al, 2012 , Peng et al, 2018 ) established that beneficial usage of coal gangue but only 15% utilized in different ways such as power generation, zeolite activated carbon, cement production and as well as fertilizers products. However, the low quantity used of disposal and inappropriate storage of coal gangue, while accumulation and disposal of this huge waste occupied the huge land, negative impact on environment ( Wu et al, 2013 ), contaminate the soil and water ( Yang et al, 2017 ) as well as serious issue for human health ( Wang et al, 2018 ). Biochar is rich source of C which generated under different pyrolysis temperatures ( Lehmann and Joseph, 2009 ) with negligible O 2 atmosphere ( Mukherjee et al, 2011 ), and has different ranges of characteristic, physical and chemical properties ( Gul and Whalen, 2016 , Lam et al, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Contrasting effects of maize residue, coal gas residue and their biochars on nutrient mineralization, enzyme activities and CO2 emissions in sandy loess soil

Shar

Peng

Tian

et al. 2021

Saudi Journal of Biological Sciences

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Mismanagement of crop straw and coal gas residue threatens the atmosphere and the economy. Nevertheless, thermal-pyrolysis is an option for management that turns bio-waste into biochar; its viability and adoption by the public as soil amendments is dependent on the agronomic and environmental values compared between biochar and the raw materials. We undertook a 60-day short-term analysis to assess the impact of various wastes and biochars, as well as inorganic nutrients (N), on carbon dioxide (CO 2 ) fluxes, soil enzyme activities, soil fertility status, and microbial activities. There were eight treatments of soil amendments: without an amendment (CK), Nutrients (N), straw + nutrients (S+N), straw biochar + nutrients (SB+N), coal gas residue + nutrients (C+N), coal gas residue biochar + nutrients (CB+N), straw + straw biochar + nutrients (S+SB+N) and coal gas residue waste + coal gas residue biochar + nutrients (C+ CB +N). The results indicated that soil EC, pH, nitrate N (NO 3 – - N), SOC, TN and available K were significantly (p < 0.05) increased coal gas residue biochar and combined with coal fly ash as compared to maize straw biochar and combined with maize straw and N treatments. The higher concentrations of soil MBC and MBN activities were increased in the maize straw application, while higher soil enzyme activity such as, invertase, urease and catalase were enhanced in the coal fly ash derived biochar treatments. The higher cumulative CO 2 emissions were recorded in the combined applications of maize straw and its biochar as well as coal gas residue and its biochar treatment. Our study concludes, that maize straw and coal fly ash wastes were converted into biochar product could be a feasible substitute way of discarding, since land amendment and decreased CO 2 fluxes and positive changes in soil microbial, and chemical properties, and can be confirmed under long-term conditions for reduction of economical and environment issues.

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Characteristics of polycyclic aromatic hydrocarbon release during spontaneous combustion of coal and gangue in the same coal seam

Cited by 36 publications

References 10 publications

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

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

Risk identification of coal spontaneous combustion based on COWA modified G1 combination weighting cloud model

Contrasting effects of maize residue, coal gas residue and their biochars on nutrient mineralization, enzyme activities and CO2 emissions in sandy loess soil

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