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Online measurement of products during fast pyrolysis of biomass

Zhang Jun~1,2 Fan Zhilin1 Lin Xiaofen1 Xu Yiqian1(1Key Laboratory of Clean Coal Power Generation and Combustion Technology of Ministry of Education, Southeast University, Nanjing 210096, China)(2State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China)  
Experiments for 7 types of biomass during fast pyrolysis at 600 ℃ were carried out in a U type reactor combined with Fourier transform infared (FTIP) and the composition of the products at 1 minute were measured on line. In order to understand the effect of temperature on the pyrolysis products of the biomass, experiments at different temperatures(400 ℃ and 800 ℃)were also done. At the same time three additives,silicon dioxide, diatomite and limestone, were used respectively for comparing their effects on the pyrolysis of biomass. The results show that the composition of the products are different in different types of the biomass studied and the primary products are CO,CO_2,CH_4,CH_3CH∶CH_2,CH_3COCH_3. Temperature is one of the key factors related to the decomposition of organic matters of biomass. At low temperature(400 ℃) CO content is low. With the increase of the temperature, the contents of the class of aldehyde, ketone and ester decrease.Different additive has different effect on the pyrolysis products, and the diatomite shows a stronger catalytic action for the decomposition of the organic matters. The results also show that the system built is very effective for the determination of the products during the fast pyrolysis of biomass.
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