|
The conventional method of generating energy is by means of combustion puts significantpressure on the environment. Therefore the study of gasification is needed. Low temperaturegasification produces synthetic gas as a fuel or material to produce chemicals in industry.This study investigated the gasification characteristics of Victorian brown in terms of reactioncompetion and structural changes happen. It was found that as the concentration of oxygenreaches 5% and 6 second residence time, char yield goes to as low as 45 % to 25 %. , the charyield decreases, which indicates more synthetic gas was produced in the reaction. Thestructural changes of char during gasification were also observed, results shows the reactionmechanism of char as it goes through gasification. This is illustrated by the BET surface area,pore volume and also the pore size. In CO2 dominated reaction, the surface area goes as highas 240 m2/g to 180 m2/g due to char fragmentation and promptly decrease to around 170m2/g, while in O2 reaction the surface area dropped to around 160 m2/g. SEM analysis showsconsiderable increase in the frequency of char particles which diameter smaller than 120microns ( from 0.27 to 0.36 for particle smaller than 100 microns and from 0.28 to 0.35 forparticle at 100 to 120 microns). While there is a noticeable decrease in the frequency of largerparticle (0.26 to 0.19 for 120 to 140 microns, 0.09 to 0.06 for 140 to 160 microns and 0.1 to0.03 for larger than 160 microns) |
