碩士生: 郭唯婕
畢業年分: 2019年7月
論文名稱: 木質類廢棄物最佳焙燒條件於流化床中之微富氧燃燒(中文) / Oxygen Enrichment Combustion in Fluidized Bed with Optimal Torrefied Woody-Waste (英文)
中文摘要:
廢棄物能源為再生能源技術之一，藉由適當的處理機制將生質廢棄物轉製成生質炭，可進一步與粉媒混燒方式產生熱/電輸出透過焙燒能有效提高燃料研磨性、疏水性與熱值。本研究利用田口法探討行道樹之能量產出率、熱值與燃燒特性指數最佳化之焙燒製成條件，接著進行燃料性質分析與熱重分析。實驗結果顯示焙燒能有效提高產物熱值與燃燒特性指數。
英文摘要:
The purpose of this study is to investigate the combustion behavior of torrefied waste wood pellets in the fluidized bed under oxygen enrichment combustion. Taguchi method is used to optimize the operating parameters for both biomass torrefaction and biochar combustion. For biomass torrefaction, three indexes, namely energy yield index (EY), proximate analysis-based index (PA), and effective combustion comprehensive index (Smix), are used to present the optimal conditions from each aspect. Torrefaction temperature, residence time, and N2 flow rate is the operating parameters in this study. S/N ratio of each parameters are evaluated to get the influence of different factors. The optimal results are used in the biochar combustion investigation. Biochar combustion is conducted in a lab-scale fluidized bed reactor with the idea of oxygen lancing combined. Oxygen with is injected into different zone of the fluidized bed to investigate the influence to combustion efficiency. The parameters for biochar combustion optimization includes torrefied materials, fluidized bed temperature, oxygen inlet position, and oxygen concentration. Total fluidized bed efficiency and volatile combustion ratio is evaluated. According to results, for biomass torrefaction, temperature is the dominant factor comparing to the other two factors. EY yields to lower temperature, while PA yields to higher temperature. Smix has the moderate temperature results. For biochar combustion, the optimal results for both index has little difference, which both yields to low bed temperature, high torrefied biochar, and where oxygen is injected at the downstream. However, higher concentration of oxygen is better for volatile combustion ratio, while moderate oxygen concentration is suitable for total fluidized bed efficiency.
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