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2018 , Vol. 18 >Issue 4: 851 - 857

DOI: https://doi.org/10.12034/j.issn.1009-606X.217376

Environment & Energy

Analysis on pyrolysis process and physicochemical properties of char fuels deprived from corn cobs

  • Xingwei YANG Maoli YANG Hai AN Haisheng CHEN Shaopeng ZHANG Zhisong LIANG
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  • 1. National Energy Large Scale Physical Energy Storage Technologies Research & Development Center (Bijie), Bijie, Guizhou 551700,
    China
    2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China

Received date: 2017-10-20

  Revised date: 2017-12-30

  Online published: 2018-08-15

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Abstract

The effect of pyrolysis temperature on the physicochemical properties of corn cob char fuel as well as the pyrolysis mechanism were investigated. Moreover, the bio-char fuels were characterized by FT-IR, XRD and SEM, thoroughly analyzing the effect of pyrolysis temperature on chemical components, functional groups’ distribution and aromatization degree of corn cob chars. The results showed that the fixed carbon and ash contents increased, volatile matter, moisture content and char yield decreased with increasing pyrolysis temperature. Heat value increased firstly and tended to decline later with the increase of temperature. Carbonyl and aliphatic functional groups were gradually destroyed, crystallinity and aromatization degree of chars increased with increasing pyrolysis temperature. The characterization of chars were heat value above 32 MJ/kg, char yield above 24%, fixed carbon above 80% and ash content of chars below 4% corresponding to the pyrolysis temperature of 500℃. Furthermore, chars obtained under 500℃ were endowed with developed porous structures, each index parameter was close to or superior to those of market sold char fuels. 233~533℃ was the temperature range in which volatile matter released the most drastically, it was characterized by reaction order of 1.5 level. When pyrolysis temperature increased from 233~353℃ to 353~533℃, the apparent activation energy decreased from 68.15 kJ/mol to 37.25 kJ/mol, correspondingly.

Key words： biomass; pyrolysis; characterization; heat value; physicochemical properties; dynamics

Cite this article

Xingwei YANG Maoli YANG Hai AN Haisheng CHEN Shaopeng ZHANG Zhisong LIANG . Analysis on pyrolysis process and physicochemical properties of char fuels deprived from corn cobs[J]. The Chinese Journal of Process Engineering, 2018 , 18(4) : 851 -857 . DOI: 10.12034/j.issn.1009-606X.217376

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