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煤中灰分的測定

发布时间：2012-03-11 点击次数：1370次

一、煤中灰分的來源及測定意義

1、來源

煤的灰分不是煤中原有的成分，而是煤中所有可燃物質完全燃燒以及煤中礦物質在一定溫度下産生一系列分解、燃燒、化合等複雜反應後剩下的殘渣。它的組成和質量均不同于煤中原有的礦物質，但煤的灰分産率與礦物質含量間有一定的相關關系，所以對所測的灰分常稱爲煤的灰分産率。

2、測定意義

灰分是降低煤炭質量的物質，在煤炭加工利用的各種場合下都帶來有害的影響，因此測定煤中灰分在對于正確評價煤的質量和加工利用方面都有重要意義。

二、測定原理

稱取一定量的空氣幹燥煤樣，放入馬弗爐或快灰儀中，以一定的速度加熱到（815±10）℃，灰化並灼燒到質量恒定。以殘留物的質量占煤樣質量的百分數作爲灰分産率。

三、測定方法

1、方法A——快速灰分測定儀法

1）、方法要點。將裝有煤樣的灰皿放在預先加熱到（815±10）℃的灰分快速測定儀的傳送帶上，煤樣自動送入儀器內完全灰化，然後送出。稱量帶灰灰皿，以殘留物的質量占煤樣質量的百分數作爲灰分産率。

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