Dynamic Study on Vacuum Pyrolysis Reaction of Chinese Fir Sawdust Biomass

Abstract

This thesis does thermal gravimetric analysis（TGA）studies on Chinese fir sawdust biomass by integrated thermal analyzer under vacuum conditions. Through the analysis on lostmass curve at different heating rate of 10, 15, 20 and 30°C/min, we found the process of Chinese fir sawdust vacuum pyrolysis can be mainly divided into three stages: evaporation of free water and combined water desorption, rapid lostmass of pyrolysis and slow decomposition of residues. The lostmass major temperature range is between 250 ~ 450°C, the peak temperature is between 365 ~ 400°C. When the pyrolysis temperature is 500°C, vacuum pyrolysis reaction of Chinese fir sawdust has basically completed. As the heating rate rises, the lostmass curve is moving to the right, the peak temperature is shifting to higher temperature, and the temperature range of thermal decomposition reaction widens significantly. According to experimental datas, we tried to obtain the vacuum pyrolysis dynamic parameters of Chinese fir sawdust, and the results are that the apparent activation energy of vacuum pyrolysis reaction of Chinese fir sawdust biomass is 128.34kJ/mol, with the pre-exponential factor being 6.42×109 and reaction order being 1.08, similar to first order reaction.

Temperature Distribution in Bio Stove using Saw Dust: An Integrated Project-based Learning

“…Sawdust is one of the biomass from wood waste. Various studies (Yang et al 2012) showed that sawdust was the potential for renewable energy. The energy value per mass of sawdust is 17 MJ/kg when viewed from a very competitive price compared to Liquefied petroleum gas (LPG) with a value of 30 MJ/kg (Kan et al, 2013).…”

“…The Fischer-Tropsch technique is one of the commercially accessible methods of manufacturing clean synthetic fuel from syngas and others. The process to produce syngas using require energy from the outside (Yang et al, 2012). The lack of this process requires additional fuel to produce syngas.…”