Processing Leucaena leucoce-phala Waste Wood to Biochar by Microwave-Induced Torrefaction
Date Issued
2015
Date
2015
Author(s)
Cheng, Pei-Hsin
Abstract
The world''s demand for energy is increasing, but we faced the shortage of fossil fuels which emits greenhouse gases and cause global warming. We are in urge to develop alternative energy sources, of which there are nuclear, solar, wind power, biomass energy and other means. The biomass energy is currently the fourth in the world''s energy supply, and there are bio-ethanol, biodiesel, bio-char, bio- gas etc. Most of the study about bio-char, is contributing to enhance its energy, so that we can mix coal and bio-char to have mixing combustion for power generation. Or use bio-char to replace coal. In those two situations, we don’t have to change our power plant equipment. Therefore, this study tries to use leucaena which is alien species in Taiwan, to develop bio-char by microwave-induced torrefaction process. Then, analyzing its’ solid product ingredients, calculating the correlation energy, and finally suggests the future applications. In this studying, we use single mode microwave device to processing our microwave-induced torrefaction experiment. The sample was heated by torrefaction condition, which is a carbonization process in a lower temperature( 200 to 400℃) and create an anoxic state by entering nitrogen gas, then finally we can gain more solid phase product(bio-char). The results showed that when the microwave power is increasing, we gain the higher weight loss rate, calorific value , fixed carbon and lower volatile matter. In the result, when operating at 250Wto30min, we gain the highest calorific value for 7085.9cal / g (29.63MJ/kg), and the highest energy density for 1.62; we gain the maximum fuel ration at 200Wto30min, but the disadvantage of them is the highly weight loss rate: the former is 82.74% and the latter is 78.6%. About approximate analysis results, when the power is increase, causing the products’ contain more fixed carbon, less volatile. Finally, we find the energy cost is 105.6 times by energy produce in this experiment. But if we increase our material mass from 8g to1000g, operating at 250Wto15min, the energy-generating capacity will be 3.18 times to the cost.
Subjects
Microwave-induced torrefaction
Leucaena
bio-char
green-energy
thermal power
SDGs
Type
thesis
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