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揮發分的含義？對揮發分的測定有何技術要求？

发布时间：2011-05-17 点击次数：1547次

揮發分的含義？對揮發分的測定有何技術要求？
答：煤的揮發分是指煤樣在900±10℃隔絕空氣的條件下加熱7min，由煤中有機物分解出來的氣體和液體（呈蒸汽狀態）的産物。
揮發分的測定是一項規範性很強的試驗，其測定的結果完全取決于所規定的試驗條件，所以在測定燃煤揮發分時，對測定的技術要求很嚴。具體如下：
技術要求：

（1）高溫爐內溫度應嚴格控制在900±10℃的範圍內，當放進試樣後，爐溫應在5min內恢複到900±10℃。
（2）加熱時間的計時應用秒表，即當試樣一送入高溫爐的高溫區開始計時，到試樣離開高溫爐爲止，這一操作過程應准確爲7min。否則，試樣做報廢處理。
（3）測定時應用專用的坩埚。當坩埚在爐內灼燒時應避免坩埚與坩埚之間、坩埚與高溫爐壁的直接接觸。
（4）在測定時，如坩埚或坩埚蓋上聚有黑煙時，試驗也做報廢處理。

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