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花生殼燃燒時著火現象的量測與分析
Measurement and Analysis of Ignition Behavior for Peanut Shell During Combustion
摘要
一紅外線溫度計和一亮度計用於量測花生殼在可控制溫度的高溫爐內之表面溫度和亮度，以分析其著火特性，試驗是在600-750℃爐溫下燃燒含水率為10-15％之間的花生殼，其重量控制在1.5和2.0公克，以便探討爐溫、樣品數量和含水率對著火特性的影響。因為花生殼含有大量揮發物會造成瞬間著火，所以在發生著火之瞬間，除了顆粒溫度上升曲線會有不連續點之外，顆粒亮度亦會突然升高，然而亮度的變化是本研究判定著火的基準。 試驗的亮度變化顯示花生殼著火的機制明顯的為同相著火乃是因為有火光產生。著火試驗結果顯示著火溫度在482-650℃之間，而且著火溫度隨著爐溫的增加和樣品重量的減少而升高，然而含水率對於著火溫度的影響並不顯著。著火延遲時間在2-6秒之間，升高爐溫、減少樣品重量和降低含水率均能降低著火的延遲時間。揮發物燃燒時間在17-27秒間，其持續時間受到爐溫和樣品重量的影響很大，若以顯著水準1％為基準，則含水率對於揮發物燃燒時間並無影響，然而，若一起考量著火延遲時間和揮發物燃燒時間，則含水率對於燃燒初期是一顯著的影響因素。
並列摘要
The ignition behavior of peanut shell was characterized by measuring particle temperature and luminosity in a temperature controlled furnace in association with an infrared pyrometer and a luminance meter. Experiments were performed by burning a batch of peanut shells, amount of 1.5 and 2.0 grams, with moisture contents in the range of 10-15% at furnace temperature in the range of 600-750℃ to investigate the influence of furnace temperature,s ample weight, and moisture content on ignition behavior. Although particle luminosity rising sharply and a discrete point in the particle temperature curve occurred at the moment of ignition since peanut shell with high volatile content resulted in spontaneous ignition, criterion of ignition occurrence was determined by the variation of luminosity in this study. Luminosity of experimental results indicated that the ignition mechanism of peanut shell should be homogenous apparently since the occurrence of the flash of light. Ignition results showed that ignition temperature was in the range of 482-650℃and increased with increase of furnace temperature as well as decrease of sample weight; however, moisture content was not a significant effect on ignition temperature. Increase of furnace temperature, increase of sample weight, and decrease of moisture content all decreased the ignition delay which was in the range of 2-6 seconds. Volatile combustion time, which was in the range of 17-27 seconds, was strongly influenced by furnace temperature and sample weight, and was not affected by moisture content based on significant level of 1%.However,if measuring the duration of ignition delay and volatile combustion time together, then moisture content was a significant effect on initial stage of combustion.