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Combustion characteristics of municipal sewage sludge with different initial moisture contents

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Abstract

The combustion characteristics of municipal sewage sludge samples with five different initial water contents (5.02, 8.21, 17.33, 27.45 and 37.85%) were assessed by using a thermogravimetric analysis approach. The ignition temperatures of the samples increased with increasing the heating rates and their initial moisture content. Ignition, burnout and comprehensive performance indices of the samples increased with decreasing their initial moisture contents. Between heating rates of 20 and 80 K min−1, the average ignition, burnout and comprehensive performance indices of the sample with initial moisture content of 5.02% were about 1.2, 2.2 and 0.9 times more than those of the sample with initial moisture content of 37.85%. The average activation energies for the samples with 5.02, 8.21, 17.33, 27.45 and 37.85% moisture contents were 146.59, 148.02, 155.13, 156.70 and 168.39 kJ mol−1. There were certain linear relations among two main kinetic parameters for the samples with different moisture contents and their main combustion stages.

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Abbreviations

α :

Conversion degree

A :

The pre-exponential factor (s−1)

D :

Combustion index

E a :

Apparent activation energy (J mol−1)

m :

Mass, empirical constant in integral function

n :

Reaction order

R :

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

t :

Time (min)

T :

Temperature (K/°C)

β :

Heating rate (K min−1)

b:

Burnout

c:

Comprehensive performance

C:

Char

i:

Ignition

m:

Mean

max:

Maximum

MC:

Moisture content

p:

Peak

VM:

Volatile matter

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Acknowledgements

This work was supported by the Fundamental Research Funds of China for the Central Universities under No. 2016YJS123.

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Authors and Affiliations

  1. Institute of Thermal Engineering, School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing, 100044, China

    Shibo Niu, Meiqian Chen, Yang Li & Taijin Lu

  2. Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing, 100044, China

    Shibo Niu, Meiqian Chen, Yang Li & Taijin Lu

Authors
  1. Shibo Niu
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  2. Meiqian Chen
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Correspondence to Meiqian Chen.

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Niu, S., Chen, M., Li, Y. et al. Combustion characteristics of municipal sewage sludge with different initial moisture contents. J Therm Anal Calorim 129, 1189–1199 (2017). https://doi.org/10.1007/s10973-017-6262-z

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