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煤的水分及其測定

发布时间：2012-04-02 点击次数：1159次

一、煤中水分的存在形態

煤中的水分是煤炭的組成部分。他與煤的變質程度、組成結構有關。煤的變質程度不同，水分變化也不同，一般泥炭的水分最大，褐煤次之，煙煤含量較低，到無煙煤又有增加趨勢。

二、煤中水分測定原理

煤中水分大多采用間接測試方法，即將已知質量的煤樣放在一定溫度的烘箱或專用微波爐中進行幹燥，根據煤樣水分蒸發後的質量損失計算煤的水分。煤中水分測定方法有沖氮幹燥法、空氣幹燥法及微波幹燥法。在這裏我們主要講解微波幹燥法

微波幹燥法：

1、方法要點

將煤樣至于微波爐內，煤中水分子在微波發生器的交變電場作用下高速振動，産生摩擦熱，是水分迅速蒸發。根據煤樣水分蒸發後的質量損失，計算水分的百分含量。

2、儀器設備

微波幹燥水分測定儀：能控制微波輻射能和輻射時間，輻射均勻。

3、測定步驟

根據微波水分測定儀說明書的要求設定工作程序，稱取粒度小于6mm的煤樣10-12g（稱准至0.01g）置于預先幹燥恒重並稱量過的稱量瓶中，晃平。

打開微波水分測定儀門，將裝有煤樣的稱量瓶放置測定的旋轉盤的規定區內。關上門，接通電源，帶程序結速後，打開門，取出稱量瓶，冷卻、稱量。

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