Pyrolysis Process of Corn Stalk Briquettes and Characteristics of Products
YANG Hua, HUANG Li, LIU Shi-cai, XU Wei, SUN Yun-juan, HOU Min
2016, 50 (3):
The pyrolysis of corn stalk briquette in a fixed bed was investigated.The influences of pyrolysis temperature on the pyrolysis process and the properties of products (solid charcoal,bio-oil and gaseous product) were studied,too.The research found that with the increase of the pyrolysis temperature,the yield of solid charcoal decreased,and the production of gaseous product increased.The bio-oil yield firstly increased and then decreased with the maximum of 35.61% at 450℃.The proximate,FT-IR and SEM analyses of solid charcoal showed that the charcoal had high ash content,the pyrolysis reaction of corn stalk briquette occuried mainly before 650℃ and the pore structure was honeycomb on the broken section.The GC-MS analyses of bio-oil showed that at low temperature (250-750℃),the organic compounds identified from pyrolysis bio-oil mainly included many oxygenated compounds such as aldehydes,ketones,furans and phenols;the phenolic compounds and furans were most abundant compounds.Nevertheless, the major compounds in the pyrolysis bio-oil obtained at higher temperatures (850-950℃) were polycyclic aromatic hydrocarbons (PAHS).The main compositions of gaseous product were CO2,CO,H2,CH4and a spot of C2Hn.In the temperature of 250-450℃,the high proportion in gaseous were CO and CO2.With the increase of temperature,the productions of CO, H2, CH4 and C2Hn increased,then the calorific value of gaseous product increased.At 650℃,the calorific value of the pyrolysis gas had reached 13.05 MJ/m3 and the rate of increasing slowed down when temperature exceed 650℃.
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