Preliminary investigation of the microwave pyrolysis mechanism of sludge based on high frequency structure simulator simulation of the electromagnetic field distribution.
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 2.94×104V/m to 0.88×104V/m when pyrolysis ends, while that of SiC sludge decreased from 3.73×104V/m at the beginning to 1.28×104V/m, then increased to 4.03×104V/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.
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
Rui
R
Ma
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
Nana
N
Yuan
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China; College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. Electronic address: sunshichang@szu.edu.cn.
Shichang
S
Sun
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
Peixin
P
Zhang
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China. Electronic address: fanglinhit@163.com.
Lin
L
Fang
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China; Laboratory of Glasses and Ceramics, Institute of Chemical Science, University of Rennes 1, Rennes 35042, France.
Xianghua
X
Zhang
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
Xuxin
X
Zhao
D017554:Carbon Compounds, Inorganic / Q000737:chemistry; D003890:Desiccation; D004574:Electromagnetic Fields; D006358:Hot Temperature; D008872:Microwaves; D012722:Sewage / Q000737:chemistry*; D017655:Silicon Compounds / Q000737:chemistry; D018505:Waste Management / Q000379:methods
D017554:Carbon Compounds, Inorganic; D012722:Sewage; D017655:Silicon Compounds; C022088:silicon carbide
Electric field intensity; HFSS simulation; Microwave pyrolysis; Raw sludge; SiC sludge