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Effect of Hot Vapor Filter Temperature on Mass Yield, Energy Balance, and Properties of Products of the Fast Pyrolysis of Pine Sawdust

Mei, Yuanfei, Liu, Ronghou, Wu, Weixuan, Zhang, Le
Energy & Fuels 2016 v.30 no.12 pp. 10458-10469
Pinus, biochar, biofuels, catalytic cracking, ceramics, energy balance, energy efficiency, energy recovery, fluidized beds, pyrolysis, sawdust, temperature, vapors
The fast pyrolysis in a fluidized-bed reactor using pine sawdust has been studied at 500 °C with ceramic hot vapor filter (HVF). The effects of HVF temperature (350, 400, 450, and 500 °C) on mass balance, energy balance, and physical properties of pyrolysis products were investigated. The results were reported that the maximum yields of bio-oil and organic liquid were 58.7 and 41.6 wt % at HVF temperatures of 350 and 400 °C, respectively. When HVF temperature increased from 350 °C to 500 °C, the maximum biochar yield was 25.3 wt % at 350 °C, while the minimum noncondensable gas (NCG) yield was 19.2 wt % at 400 °C. The energy consumption of pine sawdust pyrolysis was calculated as 2.38 MJ/kg. The optimized HVF temperature for energy balance was 450 °C. Under these conditions, the potentially recovered energy of bio-oil and total pyrolysis products reached maximum values of 7.49 MJ/kg and 17.91 MJ/kg, respectively. Maximum energy recovery ratios of total pyrolysis products and bio-oil were 0.92 and 0.39, respectively. The minimum energy consumption ratio and maximum theoretical energy efficiency were calculated as 0.64 and 67.62%, respectively. The results indicated that the HVF had a significant positive effect on improving the stability and quality of bio-oil. The molar content of NCG was affected by vapor secondary cracking reactions.