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bce ›› 2017, Vol. 51 ›› Issue (3): 41-47.doi: 10.3969/j.issn.1673-5854.2017.03.007

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Effect of Final Pyrolysis Temperature on Pyrolysis Products of Peanut Shells

TIAN Yishui1,2, WANG Ru1,3   

  1. 1. Chinese Academy of Agricultural Engineering, Beijing 100125, China;
    2. Key Laboratory of Energy Resource Utilization from Agricultural Residues, Ministry of Agriculture, Beijing 100125, China;
    3. College of Engineering, China Agricultural University, Beijing 100083, China
  • Received:2016-05-12 Online:2017-05-30 Published:2017-06-01

Abstract: The pyrolysis experiments of peanut shells under different temperatures were carried on the fixed bed pyrolysis device,which was manufactured by Chinese Academy of Agricultural Engineering. The results showed that with the increase of the final pyrolysis temperature,the yields of bio-char and energy reduced gradually;the yields of tar and pyrolysis gas were raised,as well as the heat value. And the yields of tar reached the maximum at 550℃. The fixed carbon,ash and carbon element of the bio-char increased,the hydrogen element and oxygen element decreased,and the aromatic structure and chemical biological stability improved with the increase of final pyrolysis temperature. And the heat value of bio-char achieved the maximum(24.346MJ/kg) at 500℃. The bio-char combustion process included evaporation,fixed carbon and volatile combustion,and its ignition time was significantly later than that of peanut shells. The order of comprehensive combustion characteristic index(S) of bio-char from large to small was C500 > C350 > C600 > C400 > C450 > C550. When the final pyrolysis temperature was 550℃,the specific surface area,microporous surface area,total pore volume and microporous volume of bio-char were the highest,which were 50.58m2/g and 29.56m2/g,0.01543cm3/g,and 0.01111cm3/g,respectively. However,there was still a big gap between the results of activated carbon. This required further processing.

Key words: peanut shell, pyrolysis, carbonization, bio-char, characteristic

CLC Number: