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  • Open Access


    Pore Structure Characteristics of Baking-Free Slag-Sludge Bricks and Its Correlations to Mechanical Properties

    Lei Guo1,2,3,4, Pingping Chen1, Lixia Guo1,2,3,*, Zhilong Xue4, Zi Guan1, Mingru Li1

    Journal of Renewable Materials, Vol.9, No.10, pp. 1805-1819, 2021, DOI:10.32604/jrm.2021.015140

    Abstract In order to explore the relationship between the macroscopic properties and pore structure characteristics of baking-free slag-sludge bricks, the compressive strength and water absorption rate using aluminum industrial slag and sludge of different substitution rates were tested. Optical instruments and image analysis software were used to measure the parameters of the pore structure. Specifically, a fractal model was built based on the fractal theory, in which the fractal dimension was used as the characteristic index of the pore structure to analyze the correlation and interaction mechanism between the fractal dimension and the macroscopic mechanical properties. Based on this study, conclusions… More >

  • Open Access


    Numerical Simulation of Sludge Combustion in TTF Precalciner

    Penghui Wang, Hongtao Kao*

    Journal of Renewable Materials, Vol.9, No.4, pp. 671-693, 2021, DOI:10.32604/jrm.2021.013377

    Abstract The research method of computational fluid dynamics (CFD) is used to study the technology of burning sludge in cement precalciner. The simulation results show that the flow field in the TTF precalciner is stable, the spray effect is good, and no raw meal collapse occurs. The special structure of the TTF (Trinal-sprayed) precalciner allows the pulverized coal and sludge to fully exchange heat with the flue gas and burn. When there is no sludge burning in the furnace, the decomposition rate can reach 92.1%, and the maximum temperature of the precalciner can reach 1600 K. When the moisture content of… More >

  • Open Access

    Characteristics of Fry-Drying and Solid Refuse Fuels for Organic Wastes with High Water Content

    Taein Ohm1*, Jongseong Chae1, Younghyo Kim1, Seunghyun Moon2

    Journal of Renewable Materials, Vol.5, Suppl.1, pp. 13-21, 2017, DOI:10.7569/JRM.2017.634127

    Abstract With the dramatic increase in the quantity of organic wastes, economic and environmentally friendly technologies are urgently required for reducing the volume of sludge and remediating its harmful impacts. In this study, drying experiments were performed on sludge through fry-drying technology and the characteristics of the resulting fuels were investigated to identify proper methods for treating sewage sludge, wastewater sludge, swine excreta, and food waste and converting them into fuels. The four types of organic wastes were fry-dried, and the best drying conditions were found to be 140 °C for 8 min for sewage sludge and 150 °C for 10… More >

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