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2. Preliminary investigation of the microwave pyrolysis mechanism of sludge based on high frequency structure simulator simulation of the electromagnetic field distribution

Author

Xuxin Zhao, Rui Ma, Na-Na Yuan, Shichang Sun, Xianghua Zhang, Lin Fang, Peixin Zhang, Shenzhen Univerisity [Shenzhen], Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), This paper was supported by the Shenzhen Science and Technology Planning Project (Grant Nos. JCYJ20150828113927076, JCYJ20130329113322731), the China National Natural Science Foundation (50906058) and the Natural Science Foundation of SZU (No. 827-000037)., Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Electromagnetic field, Hot Temperature, Environmental Engineering, Materials science, Carbon Compounds, Inorganic, 020209 energy, Microwave pyrolysis, Evaporation, Analytical chemistry, Bioengineering, 02 engineering and technology, 010501 environmental sciences, 01 natural sciences, 7. Clean energy, Electromagnetic Fields, [CHIM.GENI]Chemical Sciences/Chemical engineering, Waste Management, Electric field, HFSS simulation, 0202 electrical engineering, electronic engineering, information engineering, Desiccation, Microwaves, Waste Management and Disposal, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, Sewage, Waste management, [SDE.IE]Environmental Sciences/Environmental Engineering, Renewable Energy, Sustainability and the Environment, Silicon Compounds, General Medicine, Thermal conduction, Raw sludge, 6. Clean water, Microwave irradiation, Electric field intensity, SiC sludge, Pyrolysis, Intensity (heat transfer)
Abstract

Under microwave irradiation, raw sludge was pyrolyzed mainly by evaporation of water, with a weight loss ratio of 84.8% and a maximum temperature not exceeding 200 °C. High-temperature pyrolysis of SiC sludge could be realized, with a weight loss ratio of 93.4% and a final pyrolysis temperature of 1131.7 °C. Variations between the electric field intensity distribution are the main reason for the differences of pyrolysis efficiencies. HFSS simulation showed that the electric field intensity of the raw sludge gradually decreased from 2.94 × 10 4 V/m to 0.88 × 10 4 V/m when pyrolysis ends, while that of SiC sludge decreased from 3.73 × 10 4 V/m at the beginning to 1.28 × 10 4 V/m, then increased to 4.03 × 10 4 V/m. The electromagnetic effect is the main factor (r ≥ 0.91) influencing the temperature increase and weight loss of raw sludge. Both the electromagnetic effect and heat conduction effect influenced temperature rise and weight loss of SiC sludge, but the former’s influence was comparatively larger.

Published
2017
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