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bce ›› 2014, Vol. 48 ›› Issue (6): 36-43.doi: 10.3969/j.issn.1673-5854.2014.06.007

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Effect of Pyrolysis Temperature on Characteristics of Biomass Char and Coal Char

MI Cui-li1, FAN Xiao-hua1, WEI Gang1, MA Deng-qing1, ZHANG Li-meng2, WANG Xue-bin2   

  1. 1. State Grid Hebei Electric Power Corporation; Hebei Electric Power Research Institute, Shijiazhuang 050021, China;
    2. School of Energy and Power Engineering, Xi'an Jiaotong University, Key Laboratory of Thermo-fluid Science and Engineering, Xi'an 710049, China
  • Received:2014-03-13 Online:2014-11-30 Published:2014-12-10

Abstract: The effects of fuel type and pyrolysis temperature on the physicochemical properties of coal char (C-char) and biomass char were investigated with straw,oak sawdust,and Huating bituminous coal as raw materials.BET,SEM-EDS,XRD,and TGA were used to analyze the coke specimens.Results show that the BET surface area and porous volume of C-char increase as the pyrolysis temperature increases,whereas those of wood char (W-char) insignificantly change,from 600 to 1 000 ℃.Straw char (S-char) has the largest surface area and pore volume at 800 ℃ as sintering occurs at higher temperatures.As the pyrolysis temperature increases,the C content of char increases and its H and O contents decrease.The ignition characteristic of S-char is superior to those of W-char and C-char.The ignition characteristics of Wood-char and C-char decrease with the increase of pyrolysis temperature.Straw-char exhibits the best ignition characteristic at 800 ℃.

Key words: biomass, char, pyrolysis, surface area, element distribution, reactivity

CLC Number: