| Summary: | 碩士 === 國立中興大學 === 機械工程學系所 === 104 === In this study, mushroom cultivation waste (MCW) was used as the feedstock for bio-oil production from fast Pyrolysis using a 30 kWth fluidized bed. The pyrolysis temperature was in 400~ 600°C range. N2 was used as the carrier gas and its flow rate was chosen as 2~4 times of ultra minimum fluidization flow rate (Umf). The sample feed rate was varied from 2 to 3 kg/hr. The experimental results showed that maximum bio-oil production of 27.5% can be obtained under the conditions of 400°C, 2 Umf, and 2 kg/hr, for temperature, carrier gas flow rate, and sample feed rate, respectively. The measured pH value of the resulted bio-oil was 4.42. The GC-MS analysis indicated that the major species in the bio-oil are 2-furylmethanol, acetamide, butyrolactone, corylone, phenol, and 2-methoxy- and syringol.
In addition to original MCW sample, the torrefied MCW sample with temperatures of 250°C, 300°C, and 350°C, were also used as the feedstock for bio-oil production from pyrolysis in this study. For temperature, carrier gas flow rate, and feed rate of 400°C, 2 Umf, and 2 kg/hr, the pyrolysis results using torrefied samples indicated the bio-oil production decreased. However, the pH value increased, indicating that some part of organic acid was removed due to the torrefaction pretreatment. From TGA analysis, it was shown that the pyrolytic activation energy can be reduced by using torrefied sample.
The thermodynamic equilibrium analysis based on minimization of system Gibbs function for the MCW pyrolysis was also carried out in this study. The RGibbs reactor provided in ASPEN Plus was employed for evaluating the equilibrium pyrolytic products. The results indicated that both pyrolytic char and bio-oil productions decreased with the increase in temperature while pyrolytic syngas production increased with the increased temperature.
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