Flue gas-to-ash desulfurization of combustion of textile dyeing sludge: Its dependency on temperature, lignocellulosic residue, and CaO

Huang, Jian; Wu, Xieyuan; Liu, Jingyong; Chang, Ken-Lin; Evrendilek, Fatih; Liang, Guanjie

doi:10.1016/j.cej.2020.127906

Cited by 68 publications

(5 citation statements)

References 61 publications

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“…But, the RE of phosphorus was increased at 1000 °C owing to the weaker competitiveness of sulfur on calcium or magnesium. Certainly, the existence of competition between phosphorus and sulfur on calcium had been verified in previous reports. , …”

Section: Resultsmentioning

confidence: 57%

Fixation of Phosphorus in Ash during Cocombustion of Sewage Sludge and Coals: Influence of Coal and Steam

Zhao

Chen

2022

Energy Fuels

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Sewage sludge (SS) incineration technology has become a primary method to recover and reuse SS, and the cocombustion with coal is a more feasible process due to the limited heating value of wet SS and the difficulty of drying SS. Being that phosphorus is a major element in SS, its migration during cocombustion with coal was unclear but vital. Phosphorus migration during the cocombustion of wet SS and various coals was investigated by drop tube furnace in this study. More phosphorus was fixed as apatite in ash by calcic and magnesian minerals at 1000 °C than at 800–900 °C. Calcium was taken up by sulfur in Tianchi coal (TC) and subsequently captured phosphorus ineffectively at 800 °C, while the competition of sulfur on calcium was alleviated over 900 °C. Silicic and aluminic minerals in Xiheishan coal (XHS) exhibited a good capacity for phosphorus capture at 800 °C. The outstanding calcic proportion in Xiaolongtan coal (XLT) created the highest rate of phosphorus fixation in ash, and the relative enrichment (RE) of phosphorus achieved up to 93.29% at 1000 °C. Steam generally deteriorated phosphorus capture at 1000 °C. For SS cocombustion with XHS, the effect of sulfur was alleviated by steam, and the impact of steam was mainly caused by Ca5(PO4)3OH. For SS cocombustion with TC or XLT, 10% steam still hindered phosphorus capture, while 5% steam promoted phosphorus capture. The RE of phosphorus in ash was positively correlated with coal content and increased from 69.64% with 30% XLT to 93.29% with 70% XLT. TC and XHS hindered phosphorus fixation in ash, and their content hardly affected the RE of phosphorus.

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Section: Resultsmentioning

confidence: 57%

Fixation of Phosphorus in Ash during Cocombustion of Sewage Sludge and Coals: Influence of Coal and Steam

Zhao

Chen

2022

Energy Fuels

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“…However, no significant increments were detected at 800 • C after H 2 O addition. The existence of competition between sulfur and phosphorous has been verified by previous researches [43,44]. Besides faster adsorption of phosphorous brought by H 2 O, the reaction between MgO or CaO and SO 2 was simultaneously facilitated [45].…”

Section: Phosphorous Capture Improved By Mgo During Combustion With Various Moisture Content At 800-1000 • Cmentioning

confidence: 60%

Effect of Magnesium Additives on Phosphorous Recovery during Sewage Sludge Combustion and Further Improvement of Bioavailable Phosphorous

Ren

Chen

2022

Energies

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Sewage sludge (SS), a solid waste taking up a large amount of public resources, contains abundant phosphorous and urgently needs appropriate recovery, but incineration, the existing popular SS treatment method, fails to reuse phosphorous as a feasible product due to the poor phosphorous bioavailability of SS ash. Based on the mono-combustion of SS, magnesian minerals comprising of magnesium oxide were doped with SS to carry out the behavior of magnesium in phosphorous capture and its sensitivity to subsequent thermochemical modification. Five percent MgO improved phosphorous capture, and its effectiveness was disturbed by sulfur at 900 °C. The more H2O that was pumped into the atmosphere, the more phosphorous was captured by 5% MgO. The capacity of MgO in phosphorous capture was inferior to that of CaO. The utilization efficiency of MgO for phosphorous capture was inferior to that of CaO. A total of 7.2% MgO succeeded in recovering 97.46% phosphorous with 5% H2O at 900 °C. A total of 15.06% hydromagnesite merely promoted 1.85% and 5.13% of the phosphorous relative enrichment factor (RE) in SS ashes without or with 5% H2O, respectively, whereas it recovered 90.21% phosphorous with 10% H2O, supposing a potentiality in phosphorous capture for the direct combustion of wet SS. However, having been improved by magnesium, the bioavailability of phosphorous in SS ash remained extremely limited. Thus, thermal modification by K2CO3 was applied, where the limited bioavailability of phosphorous in the SS ashes was remarkably alleviated; although, SiO2 and sulfate were the main disturbers and led to the production of K2MgSiO4 and K2Mg2(SO4)3. The effective constituents were KMgPO4 and K3CaH(PO4)2 in the final mixed fertilizer. The obtained mixed fertilizer might be suitable for application on acidic soils.

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“…Pyrolysis kinetic analysis could be used in identifying the mechanism of the pyrolysis reaction, constructing a reaction kinetic model, and optimizing the reaction conditions. [13][14][15][16] By describing the thermal degreasing process of stereolithographic alumina ceramics through pyrolysis kinetics, the amount of organic matter and gas generated during the thermal degreasing process could be effectively controlled. 17 The effective description and accurate prediction of the thermal degreasing kinetics of SLA alumina ceramics reduce the generation of cracks and bubbles on workpieces surfaces, improve the quality of alumina ceramic workpieces, and establish the theoretical foundation for obtaining high-performance complex structure alumina ceramic workpieces.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the study of thermal degreasing kinetics for the degreasing process of SLA ceramics has not yet been covered. Pyrolysis kinetic analysis could be used in identifying the mechanism of the pyrolysis reaction, constructing a reaction kinetic model, and optimizing the reaction conditions 13–16 . By describing the thermal degreasing process of stereolithographic alumina ceramics through pyrolysis kinetics, the amount of organic matter and gas generated during the thermal degreasing process could be effectively controlled 17 .…”

Section: Introductionmentioning

confidence: 99%

Research on crack mechanism and kinetic model of alumina ceramic in the degreasing stage based on stereolithography

Cui

Wang

Zhao³

et al. 2023

Int J Applied Ceramic Tech

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Given that the kinetics of the thermal degreasing process of alumina ceramics based on stereolithography apparatus (SLA) has not been investigated, the mechanism of crack generation is still not fully revealed. This paper aims to elucidate the mechanism of crack generation in the degreasing process of alumina ceramics and to establish a kinetic model for alumina ceramics. Two sintering atmospheres, air, and argon, were selected for the degreasing tests at 100°C–700°C. The reaction products and mass changes of alumina ceramics were analyzed by TG‐FTIR and TG‐DSC (heating rates of 5, 10, and 15°C/min, respectively). Meanwhile, Boswell, Friedman, Ozawa, and DAEM model was used to describe the nonisothermal kinetics of the SLA alumina ceramic degreasing process. The results showed that setting the holding time to 400°C–425°C could promote the slow release of heat from the alumina ceramics. The thermal degreasing stage of the ceramic generated fewer cracks in the argon atmosphere than in the air atmosphere. The corresponding average activation energy values were 105.40 kJ/mol (Boswell model), 112.48 kJ/mol (Friedman model), 108.14 kJ/mol (Ozawa model), and 101.36 kJ/mol (DAEM model). The results of the study could provide an invaluable reference for the fabrication of defect‐free SLA alumina ceramics.

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Flue gas-to-ash desulfurization of combustion of textile dyeing sludge: Its dependency on temperature, lignocellulosic residue, and CaO

Cited by 68 publications

References 61 publications

Fixation of Phosphorus in Ash during Cocombustion of Sewage Sludge and Coals: Influence of Coal and Steam

Fixation of Phosphorus in Ash during Cocombustion of Sewage Sludge and Coals: Influence of Coal and Steam

Effect of Magnesium Additives on Phosphorous Recovery during Sewage Sludge Combustion and Further Improvement of Bioavailable Phosphorous

Research on crack mechanism and kinetic model of alumina ceramic in the degreasing stage based on stereolithography

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