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Evaluation on the non-isothermal combustion kinetics of lignite and sewage sludge through microwave pretreatment

  • Y. Li
  • M. Q. ChenEmail author
  • Y. W. Huang
Article
  • 11 Downloads

Abstract

Lignite and sewage sludge powder were pretreated through microwave heating at a power level of 119 W. The non-isothermal combustion characteristics of lignite and sewage sludge powder through the microwave pretreatment were examined based on a thermo-gravimetric technique at three heating rates (10, 20 and 30 °C min−1). The effect of the microwave pretreatment on the combustion performance index and kinetic parameters was addressed. The ignition temperature region of the lignite samples was in between 357 and 376 °C, which was higher than that of the sewage sludge samples ranged from 219 to 235 °C. The comprehensive performance index of the treated lignite and sewage sludge increased by 22.5% and 2.3%, respectively. The combustion kinetic parameters of the samples were evaluated based on KAS method coupled with Criado method. The average activation energies of the untreated lignite and sewage sludge were 213.83 and 176.92 kJ mol−1, while that for the treated samples were 232.64 and 203.01 kJ mol−1.

Keywords

Lignite Sewage sludge Microwave pretreatment Combustion performance Kinetics 

List of symbols

A

Pre-exponential factor (s−1)

Ea

Apparent activation energy (kJ mol−1)

MWP

Microwave pretreatment

R

The universal gas constant (kJ mol−1K−1)

T

Temperature (K)

Greek letters

α

Conversion degree

β

Heating rate

Subscripts

i

Ignition

b

Burnout

c

Comprehensive performance

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China under No. 51376017.

Supplementary material

10973_2019_9107_MOESM1_ESM.docx (193 kb)
Supplementary material 1 (DOCX 193 kb)

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Institute of Thermal Engineering, School of Mechanical, Electronic and Control EngineeringBeijing Jiaotong UniversityBeijingChina
  2. 2.Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small ScaleBeijingChina

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