Experimental Study of Electric Generator Efficientcy by Using rice husk gasification in improved downdraft gasifier

• Main Authors: Chea-Seng Lim, 林學誠
• Other Authors: Hsiao-Kan Ma
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/30463303228095782406

碩士 === 國立臺灣大學 === 機械工程學研究所 === 101 === Energy problem has become an important issue after Fukushima Daiichi nuclear disaster and the gasification of biomass wastes was increasingly studied in the last decade. Since rice is the stable food, there is thousands tons of rice husk dumped as wastes. Therefore, rice husk were used as experimental subject in this study. Carbon contents of the above biomass are in the range of 40% to 50%. The gasification of biomass was carried out in the lab-scale gasifier in order to evaluate the effect of O/C ratio on the gasification performance, especially the hydrogen production. Also, the gas composition (H_2, CO, CO_2, and CH_4), high heating value (HHV), gas production rate, and energy conversion efficiency (ECE) to assess the total efficiency of the gasification will be discussed. Furthermore, there are some problem because of gasifier design, like heat dissipation, tar accumulation continuous feeding problem, and the leakage etc. The aim of this study was improved the defect of commercial available gasifier and select rice husk as fuel to test in different conditions. Results of this study showed the improved gasifier can carry out steady combustion zone around 800℃ to 1100℃, moreover, we found when the equivalence ratio is 0.3, the HHV and hydrogen concentration had the optimum efficiency is 5.71(MJ/m^3) and 26.53vol %. Rice husk has a great potential as a biofuel. In this study using thermal electric generator to translate thermal energy into electric energy, the translate efficiency are 1.4% when thermal different up to 52 degree. The best efficiency 3.2% are located in temperature different of 160 degree. That can make the IGCC waste heat fully used in length period.