Influence of sodium-based materials on the slagging characteristics of Zhundong coal

Qi, Xiaobin; Song, Guoliang; Song, Weijian; Qi, Lu

doi:10.1016/j.joei.2016.08.003

Cited by 35 publications

(28 citation statements)

References 25 publications

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“…12,24,25 Lindner et al 25 discovered that the mass of silicates produced from the reaction between quartz sand and sodium acetate (NaAc) doped coal is 3−5 times greater than that from the reaction between quartz sand and NaCl-doped coal. Qi et al, 24 who investigated the slagging behavior between quartz sand and Zhundong coal doped with various Na salts (NaCl, Na 2 SO 4 , and NaAc), found that the extent of slagging follows the order NaAc/Na 2 SO 4 > NaCl. Kosminski et al 12 doped coal with NaAc or NaCl to reveal that NaAc decomposes to Na 2 CO 3 , which reacts with the silica sand, and that the steam gasification atmosphere reduces the melting point of Na 2 CO 3 .…”

Section: Introductionmentioning

confidence: 99%

Interactions between Quartz Sand and Wood Doped with either K or Na Salts under Steam Gasification and Combustion Atmospheres

Saw

Eyk

et al. 2020

Ind. Eng. Chem. Res.

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The interactions between quartz sand and wood, which was doped with either K or Na salts, were investigated in a lab-scale, fixed-bed reactor under either a steam gasification or a combustion atmosphere at 900 °C. For the cases of the potassium/sodium phosphate salts, the interaction was found to be melting induced, while for the cases of the other salts, it was found to be coating induced. Large agglomerates were found to have already been formed during the early stages of steam gasification for the wood samples doped with potassium/sodium carbonate and acetate. However, the agglomerates obtained under the combustion atmosphere were found to be insignificant for the wood samples doped with potassium/sodium chloride. Both the reaction atmosphere and the types of salts were found to affect the formation of potassium/sodium silicates in the agglomerates and the interactions between the quartz sand with gaseous K or Na significantly.

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Section: Introductionmentioning

confidence: 99%

Interactions between Quartz Sand and Wood Doped with either K or Na Salts under Steam Gasification and Combustion Atmospheres

Saw

Eyk

et al. 2020

Ind. Eng. Chem. Res.

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“…A possible reaction generating sodium disilicate is the one between silica and Na 2 SO 4 . 3 Sodium disilicate and sodium sulfate have a low melting point, 874 and 884 °C, respectively. These low-melting-point components make XJc face a potential risk of slagging.…”

Section: Resultsmentioning

confidence: 99%

“…Research has shown that a high content of alkali and alkaline earth metals (AAEMs) in the coal ash was responsible for this issue. 3 − 5 …”

Section: Introductionmentioning

confidence: 99%

Influence of Ashing Temperature on Predicting Slagging Characteristics of Xinjiang High-Sodium Low-Rank Coal and Strategy of Using Mineral Additives as Potential Slagging Preventatives

Song

2021

ACS Omega

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It is crucial to accurately evaluate the slagging characteristics of coal before industrial application. However, when evaluating the Xinjiang high-sodium low-rank coal (XJc) according to the properties of the ash prepared at 815 °C, the ashing temperature of the coal sample specified by Chinese standards, forecasting failures are frequent. To figure out the internal reason, the influence of ashing temperature on predicting slagging characteristics of XJc was investigated via an ashing test and thermodynamic equilibrium calculation. Experimental results show that when XJc is ashed at 815 °C, the ash yield apparently reduces compared to the case when ashed at 500 °C since numerous volatile components are released. The release of these components contributes to an obvious inhibition in the formation of the liquid phase in the residual ash, especially at temperatures below 1200 °C. Hence, reducing the ashing temperature is conducive to the acquirement of more real ash compositions of XJc and thereby to the accurate prediction of the slagging behaviors. By a comparison with reported experimental results, it is found that the liquid ratio–temperature curve calculated from the ash compositions of the ash prepared at 500 °C basically reflects the actual slagging tendency of XJc. According to the evolution of minerals with temperature, two slagging mechanisms, self-fusion of sodium-bearing salts and low-temperature eutectics, are confirmed. In addition, effects of antislagging measures of adding refractory oxides greatly differ among coal types due to the diversity in ash compositions.

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“…The most extensively used commercial catalyst is V 2 O 5 -WO 3 /TiO 2 [3]. Zhundong coal enriches a large amount of sodium (the total content is higher than 2%) because of the special coal-forming environment and the effect of groundwater [4]. The sodium in the coal is not completely stable in the furnace after burning [5].…”

Section: Introductionmentioning

confidence: 99%

“…They concluded that the V-OH bonds were replaced by V-O-Na, reducing the amount of Brønsted acid sites. However, the presence of SO 4 2− produced new Brønsted acid sites and promoted the adsorption of NH 3 . Hu et al [20] and Chen et al [21] specifically studied the role of SO 4 2− in catalyst deactivation.…”

Section: Introductionmentioning

confidence: 99%

Influence of Sulfur-Containing Sodium Salt Poisoned V2O5–WO3/TiO2 Catalysts on SO2–SO3 Conversion and NO Removal

et al. 2018

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A series of poisoned catalysts with various forms and contents of sodium salts (Na2SO4 and Na2S2O7) were prepared using the wet impregnation method. The influence of sodium salts poisoned catalysts on SO2 oxidation and NO reduction was investigated. The chemical and physical features of the catalysts were characterized via NH3-temperature programmed desorption (NH3-TPD), H2-temperature programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), and Fourier Transform Infrared Spectroscopy (FT-IR). The results showed that sodium salts poisoned catalysts led to a decrease in the denitration efficiency. The 3.6% Na2SO4 poisoned catalyst was the most severely deactivated with denitration efficiency of only 50.97% at 350 °C. The introduction of SO42− and S2O72− created new Brønsted acid sites, which facilitated the adsorption of NH3 and NO reduction. The sodium salts poisoned catalysts significantly increased the conversion of SO2–SO3. 3.6%Na2S2O7 poisoned catalyst had the strongest effect on SO2 oxidation and the catalyst achieved a maximum SO2–SO3-conversion of 1.44% at 410 °C. Characterization results showed sodium salts poisoned catalysts consumed the active ingredient and lowered the V4+/V5+ ratio, which suppressed catalytic performance. However, they increased the content of chemically adsorbed oxygen and the strength of V5+=O bonds, which promoted SO2 oxidation.

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Influence of sodium-based materials on the slagging characteristics of Zhundong coal

Cited by 35 publications

References 25 publications

Interactions between Quartz Sand and Wood Doped with either K or Na Salts under Steam Gasification and Combustion Atmospheres

Interactions between Quartz Sand and Wood Doped with either K or Na Salts under Steam Gasification and Combustion Atmospheres

Influence of Ashing Temperature on Predicting Slagging Characteristics of Xinjiang High-Sodium Low-Rank Coal and Strategy of Using Mineral Additives as Potential Slagging Preventatives

Influence of Sulfur-Containing Sodium Salt Poisoned V2O5–WO3/TiO2 Catalysts on SO2–SO3 Conversion and NO Removal

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