Understanding the effect of calcium containing compounds on ash deposition during boiler operation: experiment study and dynamics calculation

Kou, Xuesen; Jin, Jing; Wang, Yongzhen; Li, Yanhui; Hou, Fengxiao

doi:10.1007/s11356-021-17572-6

Cited by 4 publications

(3 citation statements)

References 46 publications

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“…EDS analysis (Table 4) distinguished mainly carbon and oxygen, but calcium, silicon, and sulphur can also be observed, among other elements. This provides valuable information concerning potential challenges, such as slagging and fouling or corrosion, which may occur in a scaled-up process [50,51].…”

Section: Scanning Electron Microscopy With Energy Dispersive X-ray Sp...mentioning

confidence: 99%

Hydrothermal Carbonization of the Wet Fraction from Mixed Municipal Solid Waste: A Fuel and Structural Analysis of Hydrochars

et al. 2022

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One of the by-products of a mechanical-biological waste treatment plant is the under-sieve fraction, which requires separation prior to further processing of municipal mixed waste. This stream usually follows the fate of landfilling. Instead, it could be introduced to the hydrothermal carbonization (HTC) process to improve its fuel properties and become solid recovered fuel. The organic fraction and high moisture content (approximately 26%) of under-sieve fraction are favorable properties for the HTC process. In this study, hydrochars, the solid product of HTC, were produced at 200 and 220 °C with residence times of 1, 4, and 8 h. The main aim of this investigation was to establish the influence of different process parameters on hydrochars’ fuel properties. Thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) were employed in the analyses. The results confirmed the positive effects of hydrothermal carbonization on the under-sieve fraction of municipal mixed waste properties. The ignition temperature increased from 247 °C to 288 °C and burnout temperature decreased to 443 °C from 489 °C after hydrothermal carbonization, causing a shorter combustion process. The determined key combustion parameters were: S = 12.4 × 10−8%·min−2·°C−3, Hf = 1174.9 °C and Di = 0.0075%·min−3, which in comparison to USF decreased by 44%, increased by 33%, and decreased by 29%, respectively, and became closer to those of coal. Furthermore, the identified structural changes indicate that hydrochars could be successfully used in energy production. The most promising results were found for hydrochar produced at 220 °C for 1 h, leading to a better combustion performance and providing a more stable and a less violent flame.

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Section: Scanning Electron Microscopy With Energy Dispersive X-ray Sp...mentioning

confidence: 99%

Hydrothermal Carbonization of the Wet Fraction from Mixed Municipal Solid Waste: A Fuel and Structural Analysis of Hydrochars

et al. 2022

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“…Due to severe ash deposition, the heat transfer ability on the heating surface can be decreased, and the local temperature of the furnace can be enhanced. Furthermore, more pollutants can be released [1,2] . Ash deposition of Zhundong coalfield as the largest integrated coalfield located in Xinjiang of China is very serious on boiler heating surface in the actual combustion process [3][4][5][6] .…”

Section: Introductionmentioning

confidence: 99%

Understanding the mechanism of ash deposition on boiler heating surface: The lattice Boltzmann and molecular dynamics simulations

Sui

Wang²,

Kou³

et al. 2023

J. Phys.: Conf. Ser.

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Severe ash deposition can cause a decrease of the heat transfer ability on the heating surface for the furnace and the release of more pollutants. In order to get the widespread use of Zhundong coal, the temperature distribution characteristics of ash deposition for Zhundong coal was studied by lattice Boltzmann method in this paper. Furthermore, the microstructure of slag was further revealed by molecular dynamics. The results indicated that the temperature of ash deposition improves with the increase of time. The temperature of the particles in the outer and middle layers for Zhundong coal is significantly smaller than that of lignite and bituminous coal. Compared with other coal types, it is difficult to transfer heat for the deposited layer of Zhundong coal, which can not achieve better energy saving effect. Additionally, calcium and sulfur in Zhundong coal ash can easily react to form calcium sulfate, aggravating ash deposition on the heating surface of the boiler. These results provide a theoretical support to solve the problem of ash deposition burning Zhundong coal.

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“…The second paper is entitled "Understanding the effect of calcium containing compounds on ash deposition during boiler operation: experiment study and dynamics calculation" (Kou et al 2022). In this work, the influence of calcium-containing compounds on ash deposition was studied to reveal the microscopic mechanism of the serious ash deposition burning Zhundong high-calcium coal.…”

mentioning

confidence: 99%

Energy-water-climate governance from interdisciplinary perspectives

2022

Environ Sci Pollut Res

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Understanding the effect of calcium containing compounds on ash deposition during boiler operation: experiment study and dynamics calculation

Cited by 4 publications

References 46 publications

Hydrothermal Carbonization of the Wet Fraction from Mixed Municipal Solid Waste: A Fuel and Structural Analysis of Hydrochars

Hydrothermal Carbonization of the Wet Fraction from Mixed Municipal Solid Waste: A Fuel and Structural Analysis of Hydrochars

Understanding the mechanism of ash deposition on boiler heating surface: The lattice Boltzmann and molecular dynamics simulations

Energy-water-climate governance from interdisciplinary perspectives

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