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題名 | 高濕穗軸在燃燒爐之燃燒分析及其顯熱輸出模式之探討 |
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作者 | 王岱淇; 馮丁樹; | 書刊名 | 農業機械學刊 |
卷期 | 3:1 1994.03[民83.03] |
頁次 | 頁31-46 |
分類號 | 348.432 |
關鍵詞 | 燃燒爐; 玉米穗軸; 含水率; 顯熱; Furnace; Corncobs; Moisture; Sensible heat; |
語文 | 中文(Chinese) |
中文摘要 | 大宗農產品廢棄物的處理仍以焚化方式配合熱能回收最有效率,玉米穗軸是一最佳例子。而在臺灣高濕氣候條件下,玉米收穫時之水分含量常在30%以上,經脫粒後,其所產生之穗軸水分亦高達40%以上,對環境造成嚴重污染,且高濕穗軸在焚化處理上,有點火不易及燃燒效率低之現象。 本文旨在利用種苗場之穗軸燃燒爐,以高濕穗軸為燃料,探討其對燃燒爐性能上的影響。實驗中發現,本燃燒爐在處理含水率為12%之乾穗軸時,每分鐘進料量不得超過1.5公斤,否則排氣中一氧化碳濃度值將超過固定物排放標準。 實驗中並發現燃燒爐之熱效率隨含水率增加而呈比例下降。濕穗軸燃燒時,爐溫必須保持500℃以上,燃燒較為完全,含水率增加時亦會造成總熱效率降低,其速率為-0.576(熱效率%╱含水率%),爐體總熱效率在含水率12%時可達55%。 利用修正模式以理論燃燒溫度(T0)預測燃燒爐燃燒穗軸時之爐內平均溫度,可得94.26%準確度;以之預測T4位置(爐壁側高117cm處之溫度)之溫度時準確度則可達93.56%。其關係式如下: Tavg=-384.569+1.41701*T0 R2=0.9426, 440<To<900℃ T4=-535.212+1.61316*T0 R2=0.9356, 440<To<900℃ |
英文摘要 | Most of agricultural waste products, such as corncobs, can be handled efficiently by incineration method with heat recovery. The corns were usually wet at harvest in Taiwan, with more than 30% for the ear corn and 40% for the corncobs. The wet corncobs can not be burned easily and efficiently in incinerators and therefore become a possible source of pollution for the environment. Objective of this study is to analyze the combustion process on the output model of sensible heat from the burning of high moisture corncobs in a biomass furnace located at Taiwan Seed Service. The experiment shows that the feed rate for corncobs with moisture of 12% should not be higher than 1.5kg per minute, or the concentration of carbon monoxide issued may exceed the discharge limit under the air pollution standard. To obtain a complete combustion process, the furnace temperature must usually be maintained higher than 500℃, while burning with high moisture corncobs. The thermal efficiency tends to decrease proportionally with the increase of moisture content of corncobs, with a dropping rate of 0.57% for every percent increase of corncob moisture. The overall efficiency may reach 55% at 12% of cob moisture. Using the modified model to predict the furnace temperatures with theoretical combustion temperature was also examined in this study. The average temperature can be obtained by this way with an accuracy of 94.26%, while the temperature at T4 position (117cm high on the side wall) can e done with 93.56%. The relationship is as following: Tavg=-384.569+1.41701*T0 R2=0.9426, 440<To<900℃ T4=-535.212+1.61316*T0 R2=0.9356, 440<To<900℃ |
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